Chain saw

Abstract

A chain saw, comprising a housing, a cutting assembly, a motor and a battery pack accommodating portion; the cutting assembly is mounted on the housing and comprises a guide bar and a saw chain arranged around the guide bar, the guide bar providing support and guidance for the saw chain; the motor is mounted inside the housing and is configured to drive the saw chain to move around the guide bar; the battery pack accommodating portion is configured to accommodate a battery pack, the battery pack being configured to provide electric energy at least to the motor; the rated input power of the motor is greater than or equal to 1200 W and less than or equal to 5500 W; the ratio of the rated input power of the motor to the bare tool weight of the chain saw is greater than or equal to 778 W / Kg, wherein the bare tool weight of the chain saw is the weight of the chain saw in a state where the guide bar, the saw chain and the battery pack are not installed. The chain saw of the present application can meet both cutting performance and lightweight requirements.

Description

A chain saw

[0001] This application claims priority to Chinese Patent Application No. 202411388067.7, filed on September 30, 2024, and Chinese Patent Application No. 202411388341.0, filed on September 30, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric tools, in particular to a chain saw. BACKGROUND

[0003] As a kind of garden electric tool, chain saw is widely used in various scenes such as family and garden. Chain saw usually includes a machine shell, a guide plate, a chain arranged on the outer periphery of the guide plate, and a motor contained in the machine shell, etc. When working, the chain of the chain saw rotates around the guide plate under the drive of the motor to cut the target object. Under different working conditions, users have different demands for the performance of the chain saw, and it has always been a technical problem to be solved to balance the cutting performance and ease of use. SUMMARY

[0004] The purpose of the present application is to provide a chain saw that can balance the cutting performance and the demand for lightweight.

[0005] The present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a chain saw, comprising: a machine shell; a cutting assembly installed on the machine shell, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor installed in the machine shell, configured to drive the saw chain to move around the guide plate; and a battery pack containing portion configured to contain a battery pack, the battery pack being configured to provide at least electrical energy to the motor; the rated input power of the motor is greater than or equal to 1200W and less than or equal to 5500W; the ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 778W / Kg, wherein the bare machine weight of the chain saw is the weight of the chain saw in the state of not assembling the guide plate, the saw chain and the battery pack.

[0007] In one embodiment, the housing includes a main housing accommodating at least the motor; the chain saw further includes a main handle arranged along a length extension direction of the chain saw; the main handle is arranged above the main housing along a height extension direction of the chain saw; a normal projection of the main housing on a reference plane P includes a main housing projection front edge close to the cutting assembly along the length extension direction L of the chain saw; a normal projection of the motor on the reference plane P includes a motor projection front edge close to the cutting assembly and a motor projection rear edge away from the cutting assembly along the length extension direction L of the chain saw; a normal projection of the main handle on the reference plane P is at least partially located between the main housing projection front edge and the motor projection rear edge along the length extension direction L of the chain saw; wherein the reference plane P is a plane perpendicular to the height extension direction H; a ratio of a rated input power of the motor to a bare machine weight of the chain saw is greater than 800 W / Kg.

[0008] In one embodiment, the rated input power of the motor is greater than or equal to 1800 W and less than or equal to 5500 W; and / or, the bare machine weight of the chain saw is less than or equal to 3.5 Kg.

[0009] In one embodiment, the rated input power of the motor is greater than or equal to 2100 W and less than or equal to 5500 W.

[0010] In one embodiment, the bare machine weight of the chain saw is less than 3 Kg.

[0011] In one embodiment, a ratio of a rated output power of the motor to a bare machine weight of the chain saw is greater than or equal to 600 W / Kg.

[0012] In one embodiment, the rated output power of the motor is greater than or equal to 1600 W.

[0013] In one embodiment, a ratio of a rated input power of the motor to a bare machine volume of the chain saw is greater than or equal to 0.162 W / cm 3 .

[0014] In one embodiment, a ratio of a rated output power of the motor to a bare machine volume of the chain saw is greater than or equal to 0.125 W / cm 3 .

[0015] In one embodiment, the overall weight of the chain saw is greater than or equal to 1.8 Kg and less than or equal to 4.5 Kg, the overall weight of the chain saw being a weight of the chain saw in a state where the chain saw is not assembled with the guide plate and the saw chain and is assembled with the battery pack.

[0016] In one embodiment, the ratio of the rated output power of the motor to the weight of the chain saw is greater than or equal to 385 W / Kg.

[0017] In one embodiment, the ratio of the rated input power of the motor to the weight of the chain saw is greater than or equal to 467 W / Kg.

[0018] In one embodiment, the rated output power of the battery pack is greater than 2100 W; and / or, the weight of the battery pack is less than 1.8 Kg.

[0019] In one embodiment, the battery pack includes a plurality of battery cells, and the battery cells are configured as full tab battery cells.

[0020] In one embodiment, the rated voltage of the battery pack is greater than 40 V and less than or equal to 100 V; and / or, the rated current of the battery pack is configured as 30-200 A.

[0021] In one embodiment, the discharge rate of the battery pack is 5-20 C.

[0022] In one embodiment, the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167 W / Kg; and / or, the energy density of the battery pack is greater than or equal to 135 Wh / Kg.

[0023] In one embodiment, the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1334 W / Kg.

[0024] In one embodiment, the rated input power of the motor is greater than or equal to 1200 W and less than or equal to 1800 W, and the bare machine weight of the chain saw is greater than or equal to 1.4 Kg and less than or equal to 2.3 Kg; and / or, the rated input power of the motor is greater than or equal to 1800 W and less than or equal to 3000 W, and the bare machine weight of the chain saw is less than or equal to 3 Kg; and / or, the rated input power of the motor is greater than or equal to 2500 W and less than or equal to 3500 W, and the bare machine weight of the chain saw is less than or equal to 3.4 Kg; and / or, the rated input power of the motor is greater than or equal to 3200 W and less than or equal to 5500 W, and the bare machine weight of the chain saw is less than or equal to 3.8 Kg.

[0025] In one embodiment, the capacity of the battery pack is configured as 70-450 Wh.

[0026] In one embodiment, the motor is configured as an outer rotor motor.

[0027] In one embodiment, the weight of the motor is 450-900 g.

[0028] In one embodiment, the cutting assembly is mounted at one end of the machine housing along the length extension direction of the chainsaw, and the machine housing is provided with a hanging ring at the end away from the cutting assembly along the length extension direction of the chainsaw, and the hanging ring is configured to attach the chainsaw to an external member.

[0029] In a second aspect, the present application also provides a chainsaw, comprising: a machine housing; a cutting assembly mounted on the machine housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the machine housing and configured to drive the saw chain to move around the guide plate; and a battery pack mounted on the machine housing and configured to provide power to at least the motor; a ratio of a rated input power of the motor to a bare machine weight of the chainsaw is greater than or equal to 778 W / Kg, wherein the bare machine weight of the chainsaw is a weight of the chainsaw in a state where the guide plate, the saw chain and the battery pack are not assembled; the battery pack comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells; and a rated voltage of the battery pack is greater than 40 V and less than or equal to 100 V.

[0030] In one embodiment, the motor is an outer rotor motor.

[0031] In a third aspect, the present application also provides a chainsaw, comprising: a machine housing; a cutting assembly mounted on the machine housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the machine housing and configured to drive the saw chain to move around the guide plate; a battery pack mounted on the machine housing and configured to provide power to at least the motor; and a main handle arranged along the length extension direction of the chainsaw, the main handle comprising a holding section for a user to hold; the battery pack comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells; a rated voltage of the battery pack is greater than 40 V and less than or equal to 100 V; and the motor is configured as an outer rotor motor.

[0032] The holding section of the main handle is at least partially above the motor in the height extension direction of the chainsaw; and a rated input power of the motor is greater than or equal to 1200 W and less than or equal to 3200 W.

[0033] Alternatively, the battery pack comprises a front side close to the cutting assembly and a back side away from the cutting assembly in the length extension direction of the chainsaw, one side of the front side of the battery pack is defined as a front side front region and the other side is defined as a front side back region, the cutting assembly and the holding section of the main handle are both located in the front side front region, and the back side of the battery pack is located in the front side back region; and a rated input power of the motor is greater than or equal to 600 W and less than or equal to 1200 W.

[0034] In one embodiment, the rated input power of the motor is greater than or equal to 600 W and less than or equal to 1200 W, and the bare machine weight of the chain saw is greater than or equal to 1 Kg and less than or equal to 2 Kg; and / or, the rated input power of the motor is greater than or equal to 1200 W and less than or equal to 3200 W, and the bare machine weight of the chain saw is less than or equal to 3 Kg.

[0035] In a fourth aspect, the present application provides a chain saw extending along three orthogonal spatial directions of a length extension direction L, a width extension direction W, and a height extension direction H, the chain saw comprising: a machine housing; a cutting assembly mounted to the machine housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the machine housing and configured to drive the saw chain to move around the guide plate; and a battery pack accommodation portion configured to accommodate a battery pack, the battery pack being configured to provide electrical energy to at least the motor; the machine housing comprises a main housing, the main housing accommodating at least the motor; the chain saw further comprises a main handle extending along the length extension direction L of the chain saw; the main handle is arranged above the main housing in the height extension direction H of the chain saw; a normal projection of the main housing on a reference plane P comprises a main housing projection front edge close to the cutting assembly in the length extension direction L of the chain saw; a normal projection of the motor on the reference plane P comprises a motor projection front edge close to the cutting assembly and a motor projection rear edge away from the cutting assembly in the length extension direction L of the chain saw; a normal projection of the main handle on the reference plane P is at least partially located between the main housing projection front edge and the motor projection rear edge in the length extension direction L of the chain saw; wherein the reference plane P is a plane perpendicular to the height extension direction H; the rated input power of the motor is greater than or equal to 1800 W and less than or equal to 3200 W; the bare machine weight of the chain saw is less than or equal to 3.5 Kg, wherein the bare machine weight of the chain saw is the weight of the chain saw in a state where the guide plate, the saw chain, and the battery pack are not assembled;

[0036] The chain saw further comprises: an electronic control device configured to at least control the start and stop of the motor; and a temperature detection device arranged on the electronic control device and in communication connection with the electronic control device, the temperature detection device being configured to collect temperature data of the electronic control device;

[0037] The electronic control device is configured to: receive the temperature data of the electronic control device sent by the temperature detection device; compare the temperature data of the electronic control device with a preset temperature threshold to determine whether a temperature protection condition is met; and perform a temperature protection action when the temperature protection condition is met; wherein the preset temperature threshold is less than or equal to 150℃.

[0038] In an embodiment, the rated output power of the motor is greater than or equal to 1600W and less than or equal to 3200W.

[0039] In an embodiment, the bare machine weight of the chain saw is less than 3Kg; and / or, the ratio of the rated output power of the motor to the bare machine weight of the chain saw is greater than 800W / Kg.

[0040] In an embodiment, the rated input power of the motor is greater than or equal to 2100W.

[0041] In an embodiment, the preset temperature threshold is greater than or equal to 80℃ and less than or equal to 130℃.

[0042] In an embodiment, the temperature protection condition is configured that the temperature data of the electronic control device is greater than or equal to a preset temperature threshold; and / or, the temperature protection action is configured that the motor is controlled to stop.

[0043] In an embodiment, the electronic control device is further configured that, in the stopped state of the motor, when the temperature data of the electronic control device is less than a preset recovery threshold, the motor is controlled to restart, the preset recovery threshold being less than the preset temperature threshold.

[0044] In an embodiment, the battery pack comprises a plurality of battery cells, and the battery cells are full-tab battery cells.

[0045] In an embodiment, the rated voltage of the battery pack is greater than 40V and less than or equal to 100V.

[0046] In an embodiment, the discharge rate of the battery pack is 5-20c.

[0047] In an embodiment, the electronic control device is arranged in the machine housing, the machine housing is provided with an air inlet and an air outlet which are in communication with the outside; the chain saw further comprises an axial flow fan, the axial flow fan is arranged in the machine housing and is configured to suck cooling air from the air inlet into the interior of the machine housing; the motor is connected to and drives the axial flow fan to rotate around a fan axis F; the orthogonal projection of the axial flow fan on a first plane P1 at least partially coincides with or is tangent to the orthogonal projection of the electronic control device on the first plane P1, the first plane P1 being a plane perpendicular to the fan axis F and parallel to the height extension direction H; and in the extension direction of the fan axis F, the axial spacing L1 between the axial flow fan and the electronic control device is configured to be less than or equal to 50mm.

[0048] In one embodiment, the axial flow fan includes an air inlet side and an air outlet side respectively located at two axial sides of the axial flow fan; the motor and the electronic control device are both arranged at the air outlet side of the axial flow fan; a projection of the motor on a second plane P2 is at least partially located within a projection of the electronic control device on the second plane P2, the second plane P2 being parallel to the fan axis F and the height extension direction H.

[0049] In one embodiment, the motor includes a motor outer wall extending in an axial direction of a power output shaft of the motor; the electronic control device includes a heat sink arranged opposite to the motor outer wall in the length extension direction L, the heat sink extending substantially along a heat dissipation plane, the fan axis F being substantially parallel to the heat dissipation plane; a shortest distance L2 from the fan axis F to the heat dissipation plane is configured to be 33mm-43.5mm; and / or a projection of a rotation plane of the axial flow fan on the first plane P1 is defined as a projection circle, a ratio L2:r1 of the shortest distance L2 from the fan axis F to the heat dissipation plane to a radius r1 of the projection circle is configured to be greater than 1 and less than or equal to 2.5.

[0050] In one embodiment, an axial distance L1 between the axial flow fan and the electronic control device in an extension direction of the fan axis F is configured to be 2mm-50mm.

[0051] In one embodiment, the electronic control device includes a control board and a heat sink, the heat sink being configured to conduct and dissipate heat generated by the control board to ambient air to achieve heat dissipation for the control board; the control board includes a MOS tube; a projection of the motor outer wall on the second plane P2 and a projection of the heat sink on the second plane P2 at least partially overlap, a projection of the MOS tube on the second plane P2 being at least partially located within the overlapping region.

[0052] In one embodiment, an axial distance D3 between the MOS tube and the axial flow fan in the extension direction of the fan axis F is configured to be 10mm-80mm.

[0053] In one embodiment, a projection of the fan axis F on the first plane P1 is a projection point U, a projection of the MOS tube on the first plane P1 is a projection M, and a shortest distance D4 from the projection point U to the projection M is configured to be 33mm-44mm.

[0054] In one embodiment, the axial flow fan is mounted on a power output shaft of the motor, the motor drives the axial flow fan to rotate around a fan axis, and the power output shaft of the motor coincides with the fan axis; the motor outer wall includes a front end portion arranged close to the axial flow fan and a rear end portion arranged away from the axial flow fan; in the extension direction of the fan axis F, the axial distance D1 between the front end portion of the motor outer wall and the axial flow fan is configured to be 0.5mm-6mm.

[0055] In one embodiment, the housing forms an internal accommodation space, the axial flow fan, the motor, and the electronic control device are arranged in the internal accommodation space; the area between the front end portion of the motor outer wall and the axial flow fan forms an airflow low pressure area, the front end portion of the motor outer wall is provided with an airflow outlet communicating with the airflow low pressure area, and the rear end portion of the motor outer wall is provided with an airflow inlet communicating with the internal accommodation space of the housing; the cooling air flowing out of the outflow side of the axial flow fan flows through the surface of the motor outer wall, and at least part of the cooling air enters the interior of the motor from the airflow inlet and flows out of the airflow outlet into the airflow low pressure area.

[0056] In one embodiment, the electronic control device is arranged in the housing, the housing is provided with an air inlet and an air outlet communicating with the outside; the chain saw further comprises an axial flow fan arranged in the housing and configured to suck cooling air from the air inlet into the interior of the housing and discharge the cooling air from the air outlet to the outside of the housing; the flow path of the cooling air flowing from the axial flow fan to the air outlet is defined as an air outlet path; the motor is connected and drives the axial flow fan to rotate around a fan axis F, and the motor includes a motor outer wall extending in the axial direction of the power output shaft thereof; the electronic control device is arranged on the air outlet path, and the electronic control device includes a heat sink arranged opposite to the motor outer wall in the length extension direction L, the heat sink extends substantially along a heat dissipation plane, and the heat dissipation plane is arranged obliquely or perpendicularly relative to the reference plane P; the orthogonal projection of the rotation surface of the axial flow fan on a first plane P1 is a projection circle, the projection circle includes an upper semicircle and a lower semicircle in the height extension direction H, the orthogonal projection of the heat sink on the first plane P1 includes an uppermost end point and a lowermost end point in the height extension direction H, and a tangent line is drawn through the uppermost end point and the lowermost end point to the lower semicircle of the projection circle, respectively, and the included angle ∑ opposite to the heat sink between the two tangent lines is configured to be greater than or equal to 15°, and the first plane P1 is a plane perpendicular to the fan axis F and parallel to the height extension direction H.

[0057] In one embodiment, the electronic control device is arranged in the machine housing, and the electronic control device has a projection on the reference plane P, and the projection of the electronic control device on the reference plane P at least partially overlaps with the projection of the motor on the reference plane P.

[0058] In one embodiment, the heat dissipation plate is provided with a plurality of heat dissipation ribs protruding towards the motor, and the plurality of heat dissipation ribs are arranged at intervals; the heat dissipation ribs are arranged to extend along an angle of 10°-170° with respect to the first plane P1, or arranged perpendicularly with respect to the fan axis F, so that the debris slides along the heat dissipation ribs.

[0059] In one embodiment, the machine housing is provided with a debris discharge opening at the bottom of the machine housing away from the main handle, and the debris discharge opening is in communication with the outside; the projection of the heat dissipation plate on the reference plane P at least partially overlaps or is tangent to the projection of the debris discharge opening on the reference plane P; and / or the projection of the motor outer wall on the reference plane P at least partially overlaps with the projection of the debris discharge opening on the reference plane P.

[0060] In one embodiment, the electronic control device is arranged in the machine housing, and the machine housing is provided with an air inlet and an air outlet in communication with the outside; the chain saw further comprises an axial flow fan arranged in the machine housing, and the axial flow fan is configured to suck cooling air from the air inlet into the inside of the machine housing; the axial flow fan comprises an air inlet side and an air outlet side respectively located on the two axial sides of the axial flow fan; the motor and the electronic control device are arranged on the air outlet side of the axial flow fan; the motor is connected to drive the axial flow fan to rotate around the fan axis F, and the motor comprises a motor outer wall extending in the axial direction of the power output shaft of the motor; the electronic control device comprises a heat dissipation plate arranged opposite to the motor outer wall in the length extension direction L; an airflow passage is formed between the heat dissipation plate and the motor outer wall; the axial flow fan is configured to make the cooling air flow from the air inlet side to the air outlet side of the axial flow fan, and flow through the airflow passage, and the cooling air flows through at least part of the heat dissipation plate while flowing through the motor outer wall.

[0061] In a fifth aspect, the present application provides a chain saw, comprising: a machine housing; a cutting assembly mounted on the machine housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the machine housing, configured to drive the saw chain to move around the guide plate; a battery pack attached to the machine housing, configured to provide power for the motor; the rated input power of the motor is greater than or equal to 1200W; the ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 778W / Kg; wherein the bare machine weight of the chain saw is the weight of the chain saw in the state of not being assembled with the guide plate, the saw chain and the battery pack.

[0062] In one embodiment, the chain saw further comprises a main handle, which is disposed above the machine housing in the height extension direction of the chain saw.

[0063] In one embodiment, the rated input power of the motor is less than or equal to 4000W.

[0064] In one embodiment, the bare machine weight of the chain saw is less than or equal to 3.5Kg.

[0065] In one embodiment, the rated input power of the motor is greater than or equal to 1200W and less than or equal to 1800W, and the bare machine weight of the chain saw is less than or equal to 2.3Kg.

[0066] In one embodiment, the rated input power of the motor is greater than or equal to 1400W and less than or equal to 1600W.

[0067] In one embodiment, the rated input power of the motor is greater than or equal to 1800W and less than or equal to 3000W, and the bare machine weight of the chain saw is less than or equal to 3.5Kg.

[0068] In one embodiment, the rated input power of the motor is greater than or equal to 2000W and less than or equal to 3000W.

[0069] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W, and the bare machine weight of the chain saw is less than or equal to 4Kg.

[0070] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 3600W.

[0071] In one embodiment, the rated input power of the motor is greater than or equal to 2400W and less than or equal to 3000W, and the ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 800W / Kg.

[0072] In one embodiment, the rated output power of the battery pack is greater than or equal to 1200W.

[0073] In one embodiment, the rated output power of the battery pack is greater than or equal to 2100W.

[0074] In one embodiment, the weight of the battery pack is less than 3.5Kg.

[0075] In one embodiment, the weight of the battery pack is less than 2Kg.

[0076] In an embodiment, the battery pack includes a plurality of battery cells, and the battery cells are configured as full tab battery cells.

[0077] In an embodiment, the battery pack has a discharge rate of 5-20C.

[0078] In an embodiment, the battery pack has a rated voltage of 38V or more and 100V or less.

[0079] In an embodiment, the battery pack has a ratio of a rated output power to a weight of the battery pack of 1167W / Kg or more.

[0080] In an embodiment, the battery pack has an energy density of 135Wh / Kg or more.

[0081] In an embodiment, the battery pack has a capacity of 70-450Wh.

[0082] In an embodiment, the battery pack has a capacity of 180-300Wh.

[0083] In an embodiment, the battery pack has a rated current of 30-200A.

[0084] In an embodiment, the battery pack has a rated current of 30-100A.

[0085] In an embodiment, the motor has a weight of 450-900g.

[0086] In an embodiment, the chain saw has a total weight of 1.8Kg or more and 4.5Kg or less, and the total weight of the chain saw is a weight of the chain saw in a state where the chain saw is not assembled with the guide plate and the saw chain and is assembled with the battery pack.

[0087] In an embodiment, the chain saw has a total weight of 1.8Kg or more and 4.2Kg or less.

[0088] In an embodiment, the motor has a ratio of a rated input power to a total weight of the chain saw of 467W / Kg or more.

[0089] In an embodiment, the motor has a ratio of a rated input power to a bare machine volume of the chain saw of 0.162W / cm 3 .

[0090] In one embodiment, the cutting assembly is mounted to one end of the housing in a lengthwise direction of the chainsaw, and the housing is provided with a hanging ring at an end away from the cutting assembly in the lengthwise direction of the chainsaw, the hanging ring being configured to attach the chainsaw to an external member.

[0091] In one embodiment, the housing comprises a main casing configured to accommodate the motor and a battery pack accommodating portion configured to accommodate the battery pack, and the main handle is arranged in a lengthwise direction of the housing and disposed above the main casing in a heightwise direction of the chainsaw.

[0092] In one embodiment, the cutting assembly is mounted to one end of the housing in a lengthwise direction of the chainsaw, and the housing is provided with a hanging ring at an end away from the cutting assembly in the lengthwise direction of the chainsaw, the hanging ring being configured to attach the chainsaw to an external member.

[0093] In one embodiment, the chainsaw further comprises a main handle, the cutting assembly is disposed at one end of the housing in a lengthwise direction of the chainsaw, and the main handle is disposed at the other end of the housing away from the cutting assembly in the lengthwise direction of the chainsaw.

[0094] In one embodiment, the rated input power of the motor is less than or equal to 5500W.

[0095] In one embodiment, the rated input power of the motor is greater than or equal to 2200W and less than or equal to 5500W.

[0096] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W.

[0097] In one embodiment, the rated input power of the motor is greater than or equal to 2800W and less than or equal to 4000W, and the ratio of the rated input power of the motor to the bare machine weight of the chainsaw is greater than or equal to 800W / Kg.

[0098] In one embodiment, the motor has a rated input power greater than or equal to 3000W and less than or equal to 5500W, and a ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 860W / Kg.

[0099] In a seventh aspect, the present application provides a chain saw, comprising: a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing and configured to provide electric energy for the motor; and a main handle arranged above the housing in a height extension direction of the chain saw; the motor has a rated input power greater than or equal to 1800W; the bare machine weight of the chain saw is less than or equal to 3.5Kg; and a ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 778W / Kg.

[0100] The bare machine weight of the chain saw is the weight of the chain saw in a state where the guide plate, the saw chain and the battery pack are not assembled.

[0101] In one embodiment, the motor has a rated input power less than or equal to 4000W.

[0102] In one embodiment, the motor has a rated input power greater than or equal to 2100W, and the bare machine weight of the chain saw is less than 2.7Kg.

[0103] In a seventh aspect, the present application provides a chain saw, comprising: a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing and configured to provide electric energy for the motor; and a main handle arranged above the housing in a height extension direction of the chain saw; the motor has a rated input power greater than or equal to 2100W; the bare machine weight of the chain saw is less than or equal to 3.5Kg; and the bare machine weight of the chain saw is the weight of the chain saw in a state where the guide plate, the saw chain and the battery pack are not assembled.

[0104] The chain saw further comprises: an electronic control device configured to at least control the start and stop of the motor; and a temperature detection device arranged on the electronic control device and configured to collect temperature data of the electronic control device.

[0105] The electronic control device is configured to receive temperature data of the electronic control device, compare the temperature data of the electronic control device with a preset temperature threshold, determine whether a temperature protection condition is met, and perform a temperature protection action when the temperature protection condition is met, wherein the preset temperature threshold is less than or equal to 150℃.

[0106] In one embodiment, the bare machine weight of the chain saw is less than or equal to 2.7 Kg.

[0107] In one embodiment, the preset temperature threshold is greater than or equal to 80℃ and less than or equal to 130℃.

[0108] In one embodiment, the temperature protection condition is that the temperature data of the electronic control device is greater than or equal to the preset temperature threshold.

[0109] In one embodiment, the temperature protection action is to control the motor to stop.

[0110] In one embodiment, the electronic control device is further configured to control the motor to restart when the temperature data of the electronic control device is less than a preset recovery threshold, wherein the preset recovery threshold is less than the preset temperature threshold.

[0111] In one embodiment, the chain saw further comprises an axial flow fan, an air inlet and an air outlet; the machine housing forms an internal accommodation space, the axial flow fan, the motor and the electronic control device are arranged in the internal accommodation space; the air inlet and the air outlet are arranged on the machine housing and are configured to connect the internal accommodation space with the outside of the machine housing; the axial flow fan is installed on the power output shaft of the motor, the motor drives the axial flow fan to rotate around a fan axis, and the power output shaft of the motor coincides with the fan axis; the axial flow fan comprises a plurality of fan blades, the outermost edge of the fan blade rotates around the fan axis to form a circular surface; the motor comprises a main body portion with a circular cross section; the main body portion does not exceed the area defined by the circular surface in orthographic projection on the circular surface; the electronic control device at least partially coincides with the circular surface in orthographic projection on the plane where the circular surface is located; the projection of the electronic control device on the fan axis is a first section, the projection of the motor on the fan axis is a second section, and the first section and the second section at least partially coincide.

[0112] In one embodiment, the chain saw further comprises an axial flow fan, an air inlet and an air outlet; the machine housing forms an internal accommodating space, the axial flow fan, the motor and the electronic control device are arranged in the internal accommodating space; the air inlet and the air outlet are arranged on the machine housing and are configured to connect the internal accommodating space with the outside of the machine housing; the axial flow fan is mounted on the power output shaft of the motor, the motor drives the axial flow fan to rotate around a fan axis, and the power output shaft of the motor coincides with the fan axis; the axial flow fan comprises an air inlet side and an air outlet side respectively located on the two axial sides of the axial flow fan; the motor and the electronic control device are arranged on the air outlet side of the axial flow fan; the motor comprises a motor outer wall extending in the direction of the power output shaft; the electronic control device comprises a heat dissipation surface arranged opposite to the motor outer wall; a gap for airflow passing is arranged between the motor outer wall and the heat dissipation surface; the axial flow fan is configured to make the airflow enter the machine housing from the air inlet, flow from the air inlet side to the air outlet side of the axial flow fan, then enter the gap between the motor outer wall and the heat dissipation surface, and flow through the motor outer wall and the heat dissipation surface to cool the motor and the electronic control device, and finally flow out from the air outlet.

[0113] In one embodiment, the chain saw further comprises an axial flow fan, an air inlet and an air outlet; the machine housing forms an internal accommodating space, the axial flow fan, the motor and the electronic control device are arranged in the internal accommodating space; the air inlet and the air outlet are arranged on the machine housing and are configured to connect the internal accommodating space with the outside of the machine housing; the axial flow fan is mounted on the power output shaft of the motor, the motor drives the axial flow fan to rotate around a fan axis, and the power output shaft of the motor coincides with the fan axis; the axial flow fan is configured to make the airflow be sucked from the air inlet into the machine housing, flow through the motor and the electronic control device, and be discharged from the air outlet to the outside of the machine housing; the electronic control device comprises a heat dissipation plate, the heat dissipation plate is arranged at an angle of 5°-175° with respect to a plane parallel to the fan axis and the length extension direction of the chain saw.

[0114] In one embodiment, the heat dissipation plate is arranged upwardly inclined.

[0115] In one embodiment, the electronic control device further comprises a control board fixedly arranged opposite to the heat dissipation plate; the heat dissipation plate is configured to conduct and dissipate the heat generated by the control board to the ambient air to achieve heat dissipation for the control board; the heat dissipation plate is provided with a plurality of heat dissipation ribs protruding therefrom, and the heat dissipation ribs are configured to extend at an angle of 5°-175° with respect to a plane parallel to the fan axis and the length extension direction of the chain saw, so that the debris slides along the heat dissipation ribs.

[0116] In one embodiment, the heat dissipation ribs extend in a direction perpendicular to the fan axis.

[0117] In one embodiment, the electronic control device comprises a control board and a heat dissipation plate fixedly arranged opposite to the control board; the heat dissipation plate comprises the heat dissipation surface; the heat dissipation plate is configured to conduct and dissipate the heat generated by the control board to the ambient air to achieve heat dissipation for the control board.

[0118] In one embodiment, the control board comprises a MOS tube; the MOS tube has a normal projection on a preset plane within a region defined by the normal projection of the motor on the preset plane, and the vertical distance of the normal projection of the MOS tube on the preset plane with respect to the normal projection of the fan axis on the preset plane is less than or equal to 10 mm, wherein the preset plane is perpendicular to a plane perpendicular to the fan axis; and / or, the spacing between the projection of the MOS tube on the fan axis and the projection of the axial flow fan on the fan axis is configured to be 10-50 mm.

[0119] In one embodiment, in the extension direction of the fan axis, the axial spacing between the end surface of the motor close to the axial flow fan and the end surface of the axial flow fan close to the motor is 0.5-6 mm.

[0120] In one embodiment, the air inlet is arranged on the side surface of the machine shell, and the air outlet is arranged on the bottom of the machine shell.

[0121] In one embodiment, the heat dissipation surface is arranged parallel to the fan axis, and the vertical distance from the tangent line of the motor to the heat dissipation surface is configured to be 1-40 mm.

[0122] In one embodiment, the battery pack comprises a plurality of battery cells, and the battery cells are full-tab battery cells.

[0123] In one embodiment, the rated voltage of the battery pack is greater than or equal to 36 V and less than or equal to 100 V; preferably, the rated voltage of the battery pack is greater than or equal to 38 V and less than or equal to 100 V.

[0124] In a ninth aspect, the present application provides a chain saw, comprising: a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing, configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing, configured to provide electric energy for the motor; and a main handle arranged above the housing in the height extension direction of the chain saw; the rated input power of the battery pack is greater than or equal to 1800W; the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167W / Kg; the weight of the battery pack is less than or equal to 3.5Kg; and the energy density of the battery pack is greater than or equal to 135Wh / Kg.

[0125] In an embodiment, the weight of the battery pack is less than 1.8Kg.

[0126] In an embodiment, the ratio of the rated input power of the motor to the overall weight of the chain saw is greater than or equal to 467W / Kg, and the overall weight of the chain saw is the weight of the chain saw in a state where the guide plate and the saw chain are not assembled and the battery pack is assembled.

[0127] In an embodiment, the battery pack comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells.

[0128] In a tenth aspect, the present application provides a chain saw, comprising: a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing, configured to drive the saw chain to move around the guide plate; a battery pack attached to the housing, configured to provide electric energy for the motor; and a main handle arranged above the housing in the height extension direction of the chain saw; the ratio of the rated output power of the motor to the bare machine weight of the chain saw is greater than or equal to 778W / Kg, wherein the bare machine weight of the chain saw is the weight of the chain saw in a state where the guide plate, the saw chain and the battery pack are not assembled; the rated output power of the motor is greater than or equal to 1800W; the battery pack comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells; and the rated voltage of the battery pack is greater than or equal to 36V and less than or equal to 100V.

[0129] In an embodiment, the rated output power of the motor is less than or equal to 4000W.

[0130] In an embodiment, the rated output power of the motor is greater than or equal to 2100W and less than or equal to 4000W.

[0131] In one embodiment, the battery pack weighs less than 1.8 Kg.

[0132] In one embodiment, the battery pack has a rated current of 30-200 A; preferably, the battery pack has a rated current of 30-100 A.

[0133] In one embodiment, the battery pack has a rated voltage of 38 V or more and 100 V or less.

[0134] In a eleventh aspect, the application provides a chain saw, comprising: a casing; a cutting assembly mounted on the casing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the casing and configured to drive the saw chain to move around the guide plate; a battery pack attached to the casing and configured to provide electric energy for the motor; and a main handle arranged above the casing in the height extension direction of the chain saw; the motor has a rated output power of 1600 W or more; the chain saw has a bare machine weight of 3.5 Kg or less; the ratio of the rated output power of the motor to the bare machine weight of the chain saw is 600 W / Kg or more; wherein the bare machine weight of the chain saw is the weight of the chain saw in a state where the guide plate, the saw chain and the battery pack are not assembled.

[0135] In one embodiment, the motor has a rated output power of 3000 W or less.

[0136] In one embodiment, the ratio of the rated output power of the motor to the bare machine weight of the chain saw is greater than 700 W / Kg and less than or equal to 1200 W / Kg.

[0137] In one embodiment, the ratio of the rated output power of the motor to the bare machine weight of the chain saw is greater than 700 W / Kg and less than or equal to 1200 W / Kg. BRIEF DESCRIPTION OF DRAWINGS

[0138] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations to the present application.

[0139] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0140] Fig. 1 is a perspective view of the overall structure of a chain saw according to an embodiment of the present application;

[0141] Fig. 2 is a left view of a chain saw according to an embodiment of the present application, in a state where a left case is not assembled;

[0142] Fig. 3 is a rear view of an overall structure of a chain saw according to an embodiment of the present application;

[0143] Fig. 4 is a diagram of a work scene when a chain saw according to an embodiment of the present application is used for work on a tree;

[0144] Fig. 5 is a perspective view of a chain saw according to an embodiment of the present application, in a state where a battery pack and a cutting assembly are not assembled;

[0145] Fig. 6 is a perspective view of a partial structure of a chain saw according to an embodiment of the present application;

[0146] Fig. 7 is a left view of a partial structure of a chain saw according to an embodiment of the present application, in which a position relationship of a radial fan and an electronic control device is shown;

[0147] Fig. 8 is a left view of a partial structure of a chain saw according to an embodiment of the present application, in which a position relationship of a motor and an electronic control device is shown;

[0148] Fig. 9 is a front view of a partial structure of a chain saw according to an embodiment of the present application, in which a position relationship of a motor, a radial fan, and an electronic control device is shown;

[0149] Fig. 10 is a left view of a radial fan and a motor according to an embodiment of the present application;

[0150] Fig. 11 is a left view of a motor, a radial fan, and an electronic control device according to an embodiment of the present application;

[0151] Fig. 12 is a left view of a motor and an electronic control device according to an embodiment of the present application;

[0152] Fig. 13 is a cross-sectional view according to an embodiment of the present application;

[0153] Fig. 14 is a flowchart of a temperature protection strategy according to an embodiment of the present application;

[0154] Fig. 15 is a flowchart of a temperature protection strategy according to a specific embodiment of the present application;

[0155] Fig. 16 is a perspective view of an overall structure of a chain saw according to another embodiment of the present application;

[0156] Fig. 17 is a structural schematic view of a chain saw according to still another embodiment of the present application;

[0157] Figs. 18a to 18d are schematic views of position relationships of orthographic projections of an electronic control device and a radial fan on a first plane PI according to embodiments of the present application.

[0158] 100, machine shell 10, internal accommodation space 101, fairing 102, fairing cavity 1021, main shell 103, main shell projected front edge 1031, battery pack accommodation portion 104, reinforcing rib 105, left machine shell 1001, right machine shell 1002, bottom surface 1003, cutting assembly 20, guide plate 201, saw chain 202, safety guard 203, motor 30, motor projected front edge 3001, motor projected rear edge 3002, power output shaft 301, main body portion 302, motor outer wall 303, front end portion 3031, rear end portion 3032, air outlet 304, battery pack 40, front side surface 401, rear side surface 402, main handle 501, auxiliary handle 502, electronic control device 60, control board 601, MOS tube 6011, heat sink 602, heat dissipation surface 6021, heat dissipation rib 6022, temperature detection device 70, temperature sensor 701, axial flow fan 801, fan blade 8011, circular surface 8012, fan axis F, air inlet 802, air outlet 803, chip removal port 804, hanging ring 90, first hanging ring 901, second hanging ring 902. DETAILED DESCRIPTION

[0159] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0160] Chain saw is a garden handheld tool for cutting wood. For chain saw, different application scenarios and different cutting objects have different requirements for cutting performance, weight, size, etc. of chain saw. In the related art, when cutting wood with large size or high hardness, a motor with large output power is usually required to meet the cutting requirement, and in order to meet the requirement of large output power, the weight and volume of the battery pack and the motor are usually increased, which increases the weight of the whole machine, is not conducive to light weight, reduces the use comfort of the operator, is easy to fatigue, and brings great inconvenience to the operator. In order to reduce the operation burden of the user, the chain saw usually has the requirement of light weight to improve the use comfort of the user and reduce fatigue. In order to meet the requirement of light weight, the volume or weight is usually reduced, which often brings the problems of low output power and inability to meet the cutting performance requirement, which may cause slow cutting speed, low cutting efficiency, and even inability to cut, and affects the work efficiency of the operator. That is to say, the chain saw in the related art has high power and good cutting performance, but heavy weight; or light weight, but low power and poor cutting performance. For those skilled in the art, the technical problem to be solved is how to simultaneously consider the requirements of cutting performance and light weight.

[0161] To solve the above problems, the present application provides a chain saw which simultaneously considers the requirements of light weight and high motor output power.

[0162] Referring to FIGS. 1-4, a chain saw 100 includes a machine housing 10, a cutting assembly 20, a motor 30, and a battery pack receiving portion 104. The cutting assembly 20 is mounted to the machine housing 10, and includes a guide plate 201 and a saw chain 202 disposed around the guide plate 201. The guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is mounted within the machine housing 10 and is configured to drive the saw chain 202 to move around the guide plate 201. The battery pack receiving portion 104 is configured to receive a battery pack 40, which is configured to provide electrical energy to at least the motor 30. The motor 30 has a rated input power greater than or equal to 1200 W and less than or equal to 5500 W. The ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100 is greater than or equal to 778 W / Kg, where the bare machine weight of the chain saw 100 is the weight of the chain saw 100 without the guide plate 201, the saw chain 202, and the battery pack 40.

[0163] It is to be noted that the bare machine weight of the chain saw 100 is the weight of the chain saw 100 in a state where the chain saw 100 is not assembled with the guide plate 201, the saw chain 202, and the battery pack 40. In some embodiments, the chain saw 100 comprises a safety guard covering the cutting assembly 20; and / or, the chain saw 100 comprises a lubricating mechanism comprising an oil tank for containing lubricating liquid. Further, the bare machine weight of the chain saw 100 is the weight of the chain saw 100 in a state where the chain saw 100 is not assembled with the guide plate 201, the saw chain 202, the battery pack 40, the safety guard, and the oil tank of the lubricating mechanism is free of lubricating liquid.

[0164] The chain saw motor has high output power and light weight, and can meet the requirements of cutting performance and light weight. It can be understood that the higher the rated input power of the motor 30, the higher the upper limit of the output power of the motor 30, and the greater the ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100, the chain saw 100 can better meet the requirements of high output power and light weight. On the one hand, the high power of the motor 30 can meet the requirement of cutting performance, and on the other hand, the light weight of the chain saw 100 makes the user less tired. In addition, for the user, high power can also improve cutting efficiency and shorten working time, thereby creating greater economic benefits for the garden team.

[0165] Further, the rated input power of the motor 30 can be 1200W, 1300W, 1400W, 1500W, 1600W, 1800W, 2000W, 2400W, 3000W, 3500W, 4000W, 4500W, 5000W, 5500W, etc. Optionally, the rated input power of the motor 30 is greater than or equal to 1800W and less than or equal to 5500W. Further optionally, the rated input power of the motor 30 is greater than or equal to 2100W and less than or equal to 5500W.

[0166] Further, the ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100 can be 778W / Kg, 800W / Kg, 850W / Kg, 900W / Kg, 940W / Kg, 1000W / Kg, 1070W / Kg, etc. Optionally, the ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100 is greater than 800W / Kg.

[0167] Further, the bare machine weight of the chain saw 100 is less than or equal to 4Kg. Exemplarily, the bare machine weight of the chain saw 100 can be 1.5Kg, 1.8Kg, 2Kg, 2.2Kg, 2.35Kg, 2.55Kg, 2.7Kg, 2.8Kg, 3Kg, 3.5Kg, 4Kg, etc. Optionally, the bare machine weight of the chain saw 100 is less than or equal to 3.5Kg. Further optionally, the bare machine weight of the chain saw 100 is less than 3Kg. Further optionally, the bare machine weight of the chain saw 100 is less than 2.7Kg.

[0168] It can be appreciated that the chain saw 100 is lighter in weight at the same power, i.e., the chain saw 100 is lighter in weight while achieving the same cutting performance, and better meets the requirements of high power and light weight.

[0169] In some embodiments, the motor 30 has a rated input power greater than or equal to 1800W and less than or equal to 5500W. The bare machine weight of the chain saw 100 is less than or equal to 3.5Kg.

[0170] In some embodiments, the motor 30 has a rated input power greater than or equal to 2100W and less than or equal to 5500W. The bare machine weight of the chain saw 100 is less than 3Kg.

[0171] In some embodiments, the motor has a rated input power greater than or equal to 1200W and less than or equal to 4000W. The bare machine weight of the chain saw is less than or equal to 3.5Kg.

[0172] In some embodiments, the motor 30 has a rated input power greater than or equal to 1200W and less than or equal to 1800W, and the bare machine weight of the chain saw 100 is greater than or equal to 1.4Kg and less than or equal to 2.3Kg. Illustratively, the rated input power of the motor 30 can be 1200W, 1400W, 1500W, 1600W, 1700W, 1800W, etc. The bare machine weight of the chain saw 100 can be 1.4Kg, 1.5Kg, 1.6Kg, 1.7Kg, 1.8Kg, 2Kg, 2.1Kg, 2.3Kg, etc.

[0173] In some embodiments, the motor 30 has a rated input power greater than or equal to 1800W and less than or equal to 3000W, and the bare machine weight of the chain saw 100 is less than or equal to 3Kg. Illustratively, the rated input power of the motor 30 can be 1800W, 2000W, 2100W, 2400W, 2800W, 3000W, etc. The bare machine weight of the chain saw 100 can be 1.5Kg, 1.8Kg, 2Kg, 2.2Kg, 2.55Kg, 2.8Kg, 3Kg, etc.

[0174] In some embodiments, the motor 30 has a rated input power greater than or equal to 2500W and less than or equal to 3500W, and the bare machine weight of the chain saw 100 is less than or equal to 3.4Kg. Illustratively, the rated input power of the motor 30 can be 2500W, 2600W, 2800W, 3000W, 3100W, 3200W, 3500W, etc. The bare machine weight of the chain saw 100 can be 1.8Kg, 2Kg, 2.2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.4Kg, etc.

[0175] In some embodiments, the motor 30 has a rated input power greater than or equal to 3200W and less than or equal to 5500W, and the bare machine weight of the chain saw 100 is less than or equal to 3.8Kg. Illustratively, the motor 30 can have a rated input power of 3200W, 3400W, 3500W, 3800W, 4000W, 4500W, 5000W, 5500W, etc. The chain saw 100 can have a bare machine weight of 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.8Kg, etc.

[0176] In some embodiments, the motor has a rated input power greater than or equal to 1800W and less than or equal to 3000W. Illustratively, the motor can have a rated input power of 1800W, 2000W, 2100W, 2400W, 2800W, 3000W, etc. The chain saw has a bare machine weight less than or equal to 3.5Kg. Illustratively, the chain saw can have a bare machine weight of 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.5Kg, etc. Preferably, the motor has a rated input power greater than or equal to 2000W and less than or equal to 3000W. Illustratively, the motor can have a rated input power of 2000W, 2100W, 2400W, 2600W, 2800W, 3000W, etc.

[0177] In some embodiments, the motor has a rated input power greater than or equal to 2800W and less than or equal to 4000W. Illustratively, the motor can have a rated input power of 2800W, 3000W, 3200W, 3500W, 3600W, 4000W, etc. Preferably, the motor has a rated input power greater than or equal to 2800W and less than or equal to 3600W. The chain saw has a bare machine weight less than or equal to 4Kg. Illustratively, the chain saw can have a bare machine weight of 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 4Kg, etc. Preferably, the chain saw has a bare machine weight less than or equal to 3.5Kg. Illustratively, the chain saw can have a bare machine weight of 1.5Kg, 1.8Kg, 2Kg, 2.55Kg, 2.8Kg, 3Kg, 3.5Kg, etc.

[0178] In some embodiments, the motor has a rated input power greater than or equal to 2400W and less than or equal to 3000W. Illustratively, the motor can have a rated input power of 2400W, 2600W, 2800W, 3000W, etc. The ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 800W / Kg.

[0179] As an example, the motor has a rated input power greater than or equal to 1200 W and less than or equal to 4000 W; the ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 778 W / Kg. The bare machine weight of the chain saw is less than or equal to 3.5 Kg. Preferably, the rated input power of the motor is greater than or equal to 2000 W and less than or equal to 3000 W, and the bare machine weight of the chain saw is less than or equal to 3 Kg. As a specific example, the rated input power of the motor is 2400 W, and the bare machine weight of the chain saw is 2.55 Kg; as another specific example, the rated input power of the motor is 1500 W, and the bare machine weight of the chain saw is 1.8 Kg; as still another specific example, the rated input power of the motor is 3000 W, and the bare machine weight of the chain saw is 2.87 Kg.

[0180] For ease of understanding, with reference to FIGS. 2 and 3, the chain saw is defined as extending along three orthogonal spatial directions, a length extension direction L (also referred to as an X-axis direction), a width extension direction W (also referred to as a Y-axis direction), and a height extension direction H (also referred to as a Z-axis direction). The length extension direction L is also the length extension direction of the guide plate 201; the width extension direction W is also the thickness extension direction of the guide plate 201; and the height extension direction H is also the height extension direction of the guide plate 201. The side of the chain saw 100 on which the cutting assembly 20 is provided in the length extension direction is defined as the front, and the side away from the cutting assembly 20 is defined as the rear. When the user uses the chain saw and faces the front, the direction of the user's left hand in the width extension direction of the chain saw 100 is defined as the left, and the direction of the user's right hand is defined as the right; the top in the height extension direction of the chain saw 100 is defined as the upper, and the bottom is defined as the lower. It can be understood that the above definitions are only for illustration and cannot be understood as a limitation on the present application.

[0181] In some scenarios, the operator may need to work on a tree, and compared with a conventional chain saw, a chain saw for tree work is usually used by an arborist to cut branches. Due to the need to be carried to the tree for use, and the limited space for extension on the tree, the chain saw for tree work often needs to be light in weight and compact in size.

[0182] In some embodiments, the housing 10 comprises a main housing 103 which at least accommodates the motor 30. The chain saw 100 further comprises a main handle 501 for a user to hold when operating the chain saw 100. The main handle 501 is disposed along the length extension direction L of the chain saw 100. The main handle 501 is disposed above the main housing 103 in the height extension direction H of the chain saw 100. The orthographic projection of the main housing 103 on the reference plane P comprises a main housing projection front edge 1031 which is close to the cutting assembly 20 in the length extension direction L of the chain saw 100; the orthographic projection of the motor 30 on the reference plane P comprises a motor projection front edge 3001 which is close to the cutting assembly 20 and a motor projection rear edge 3002 which is away from the cutting assembly 20 in the length extension direction L of the chain saw 100; the orthographic projection of the main handle 501 on the reference plane P is at least partially located between the main housing projection front edge 1031 and the motor projection rear edge 3002 in the length extension direction L of the chain saw 100; wherein the reference plane P is a plane which is perpendicular to the height extension direction H of the chain saw 100. That is, the main handle 501 is at least partially located within the region E in FIG. 2.

[0183] In some embodiments, the main handle 501 is disposed above the housing 10 in the height extension direction of the chain saw 100. Compared with the structure in which the main handle is disposed behind the housing, the main handle 501 disposed above the housing 10 makes the chain saw 100 more compact in volume and more portable.

[0184] Further, the ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100 is greater than 800 W / Kg.

[0185] In some embodiments, the ratio of the rated input power of the motor 30 to the bare machine volume of the chain saw 100 is greater than or equal to 0.162 W / cm 3 . For example, the ratio of the rated input power of the motor to the bare machine volume of the chain saw can be 0.162 W / cm 3 , 0.165 W / cm 3 , 0.170 W / cm 3 , 0.175 W / cm 3 , 0.178 W / cm 3 , 0.185 W / cm 3 , etc. Preferably, the ratio of the rated input power of the motor to the bare machine volume of the chain saw is greater than or equal to 0.170 W / cm 3 . As a specific example, the rated input power of the motor is 2400 W, the length, width and height of the chain saw are 31.6 cm, 20.4 cm and 21.0 cm respectively, the volume is 13537.44 cm 3 , and the ratio of the rated input power of the motor to the bare machine volume of the chain saw is 0.1773 W / cm 3It should be noted that the length, width and height dimensions of the chain saw are the maximum dimensions of the chain saw in the length extension direction L, the width extension direction W and the height extension direction H, respectively, which can be measured by clamping the chain saw with two parallel planes.

[0186] It can be understood that the greater the ratio of the rated input power of the motor to the bare machine volume of the chain saw, the greater the volume under the same input power, or the greater the input power under the same volume. The greater the input power, the greater the output power. Therefore, the purpose of high power and small volume of the chain saw can be achieved, and the requirements of cutting performance and portability are considered.

[0187] In some embodiments, the rated output power of the motor 30 is greater than or equal to 1600W. The rated output power of the motor 30 is the maximum output power at which the motor 30 can work stably for a long time under normal working conditions. It should be noted that "the motor can work stably for a long time" should be understood as: at least during the time from full charge to empty charge of the battery pack 40, the motor 30 can continue to operate. Exemplarily, the rated output power of the motor 30 can be 1600W, 1800W, 2000W, 2400W, 2800W, 3000W, etc. Further, the rated output power of the motor 30 is greater than or equal to 1600W and less than or equal to 5000W. Exemplarily, the rated output power of the motor 30 can be 1600W, 1800W, 2000W, 2400W, 2800W, 3000W, 3500W, 4000W, 4500W, 5000W, etc. Alternatively, the rated output power of the motor 30 is greater than or equal to 1600W and less than or equal to 3000W.

[0188] In some embodiments, the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw 100 is greater than or equal to 600W / Kg. Exemplarily, the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw 100 can be 600W / Kg, 625W / Kg, 700W / Kg, 800W / Kg, 900W / Kg, 1000W / Kg, 1100W / Kg, 1200W / Kg, etc. Alternatively, the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw 100 is greater than or equal to 625W / Kg and less than or equal to 1200W / Kg. More alternatively, the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw 100 is greater than 700W / Kg and less than or equal to 1200W / Kg. Among them, compared with the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw 100 being 625W / Kg, the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw 100 being 700W / Kg, the embodiment can better balance the requirements of high power and light weight, and the comprehensive performance is better.

[0189] As a specific example, the rated output power of the motor is 2000W; the naked machine weight of the chain saw is 2.55Kg; the ratio of the rated output power of the motor to the naked machine weight of the chain saw is 784.3W / Kg.

[0190] It can be understood that the greater the ratio of the rated output power of the motor 30 to the naked machine weight of the chain saw 100, the lighter the weight under the same power, and the greater the power under the same weight, which can better meet the needs of high power and light weight. On the one hand, the high power of the motor 30 can meet the cutting performance requirements, and on the other hand, the light weight of the chain saw 100 makes the user less tired during operation. In addition, for the user, high power can also improve cutting efficiency and shorten working time, thereby creating greater economic benefits for the garden team.

[0191] In some embodiments, the ratio of the rated output power of the motor 30 to the naked machine volume of the chain saw 100 is greater than or equal to 0.125W / cm 3 . For example, the ratio of the rated output power of the motor to the naked machine volume of the chain saw can be 0.125W / cm 3 , 0.135W / cm 3 , 0.145W / cm 3 , 0.16W / cm 3 , etc. Alternatively, in some embodiments, the ratio of the rated output power of the motor to the naked machine volume of the chain saw is greater than or equal to 0.13W / cm 3 and less than or equal to 0.2W / cm 3 . For example, the ratio of the rated output power of the motor to the naked machine volume of the chain saw can be 0.13W / cm 3 , 0.15W / cm 3 , 0.18W / cm 3 , 0.2W / cm 3 , etc.

[0192] It can be understood that the greater the ratio of the rated output power of the motor to the naked machine volume of the chain saw, the greater the volume under the same output power, and the greater the output power under the same volume. Therefore, the purpose of large power and small volume of the chain saw can be achieved, and the needs of cutting performance and portability can be met.

[0193] In some embodiments, the total weight of the chain saw 100 is greater than or equal to 1.8 Kg and less than or equal to 4.5 Kg. The total weight of the chain saw 100 is the weight of the chain saw 100 in a state where the chain saw 100 is not assembled with the guide plate 201 and the saw chain 202 and is assembled with the battery pack 40. That is, the total weight of the chain saw 100 is the sum of the bare weight of the chain saw and the weight of the battery pack. Exemplarily, the total weight of the chain saw 100 can be 1.8 Kg, 2 Kg, 2.5 Kg, 3 Kg, 3.5 Kg, 3.8 Kg, 4 Kg, 4.15 Kg, 4.2 Kg, 4.4 Kg, 4.5 Kg, etc. Alternatively, the total weight of the chain saw 100 ranges from greater than or equal to 3.5 Kg and less than or equal to 4.5 Kg. Preferably, the total weight of the chain saw 100 is less than or equal to 4.2 Kg. In one specific embodiment, the total weight of the chain saw 100 is 4.15 Kg.

[0194] In some embodiments, the ratio of the rated output power of the motor 30 to the total weight of the chain saw 100 is greater than or equal to 385 W / Kg. Exemplarily, the ratio of the rated output power of the motor to the total weight of the chain saw can be 385 W / Kg, 425 W / Kg, 475 W / Kg, 500 W / Kg, 550 W / Kg, etc.

[0195] It can be understood that the ratio of the rated output power of the motor to the total weight of the chain saw is high, i.e., under the same power, the weight is light, and under the same weight, the power is large, which can also represent that the chain saw can better balance the large output power and the light weight.

[0196] In some embodiments, the ratio of the rated input power of the motor 30 to the total weight of the chain saw 100 is greater than or equal to 467 W / Kg. Exemplarily, the ratio of the rated input power of the motor 30 to the total weight of the chain saw 100 can be 467 W / Kg, 480 W / Kg, 500 W / Kg, 550 W / Kg, 578 W / Kg, 600 W / Kg, 700 W / Kg, etc. Preferably, the ratio of the rated input power of the motor to the total weight of the chain saw is greater than or equal to 500 W / Kg. As a specific example, the rated input power of the motor is 2400 W, and the total weight of the chain saw is 4.15 Kg. The ratio of the rated input power of the motor 30 to the total weight of the chain saw 100 is 578 W / Kg.

[0197] To achieve the purpose of balancing the large output power and the light weight, one possible solution is to improve the output power of the motor, and another possible solution is to reduce the total weight.

[0198] In some embodiments, the battery pack has a rated output power greater than or equal to 1200W. Illustratively, the battery pack 40 can have a rated output power of 1200W, 1600W, 2000W, 2100W, 2400W, 2800W, 3000W, 3200W, 3600W, 4000W, 4500W, 5000W, 5500W, etc. Preferably, the battery pack 40 has a rated output power greater than 2100W.

[0199] In some embodiments, the battery pack 40 has a weight less than 3.5Kg. Illustratively, the battery pack 40 can have a weight of 1.3Kg, 1.5Kg, 1.6Kg, 1.7Kg, 1.8Kg, 1.9Kg, 2Kg, 2.5Kg, 3Kg, 3.5Kg, etc. Optionally, the battery pack 40 has a weight less than 3Kg. Also optionally, the battery pack 40 has a weight less than 2Kg. Further optionally, the battery pack 40 has a weight less than 1.8Kg.

[0200] It can be understood that the battery pack is a part of the whole machine, and the battery pack is light in weight, so that the whole machine is also light in weight in the case of the same bare machine; in order to achieve the purpose of large power output of the motor, the battery pack also needs to be able to provide large output power, that is, the output power of the battery pack also needs to be large. The large power and light weight of the battery pack in the embodiment further realize the large power and light weight of the whole machine.

[0201] In some embodiments, the battery pack 40 includes a plurality of battery cells, and the battery cells are configured as full-tab battery cells. The full-tab battery cell is also called a tab-free battery cell. For the structure of the full-tab battery cell, any full-tab battery cell in the prior art can be used, which can be configured according to actual needs, and is not limited herein. As a specific example, the full-tab battery cell is configured as a 21700 full-tab battery cell, wherein “21700” indicates that the battery diameter is 21mm, the height is 70mm, and “0” represents a cylindrical battery.

[0202] The full-tab battery cell directly extends the positive electrode body of the whole battery cell body to the positive electrode by metal extension technology, connects the positive electrode body with the shell of the battery cell, and directly extends the negative electrode by the same technology to connect the lower end of the battery cell shell. The full-tab battery cell changes the whole current collector into a tab, and the current can flow through numerous paths along the whole length of the anode and cathode, rather than being limited to one or a few tabs, which greatly shortens the current path inside the battery, significantly reduces the internal resistance, and improves the conduction efficiency of the current.

[0203] The full-tab battery cell has the advantages of small internal resistance, less heat generation, large maximum current of the battery cell, large maximum discharge current allowed, less battery cells required under the same discharge current, reduced total weight of the battery cells, and further reduced weight of the battery pack. Under the same number of battery cells, a larger discharge current can be achieved, and further a larger output power can be achieved under the same voltage. The large power can be achieved while the light weight is considered.

[0204] Further, the internal resistance of the battery pack is configured to make the maximum discharge depth of the battery pack greater than or equal to 85%. Preferably, the maximum discharge depth of the battery pack is greater than or equal to 90%. It can be understood that even as the voltage decreases and the current increases, the heat generation is still less than that of a conventional battery pack due to the small internal resistance of the battery pack, and the equipment will not be burned out due to overheating. Therefore, the undervoltage protection can be set to a smaller undervoltage protection value than that of a conventional battery pack, a larger discharge depth can be achieved, and the single-pack endurance is long. Since the full-tab battery cell is used, the internal resistance of the battery pack is one order of magnitude smaller than that of a conventional battery pack, and the internal resistance of the battery pack is only about one tenth of that of a conventional battery pack. As an example, the maximum discharge depth of the battery pack is about 95%.

[0205] In some embodiments, the rated voltage of the battery pack is greater than or equal to 36V and less than or equal to 100V. Exemplarily, the rated voltage of the battery pack can be 36V, 38V, 40V, 48V, 54V, 60V, 80V, 100V, etc. Alternatively, the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. Preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 100V. More preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 80V. In a specific embodiment, the rated voltage of the battery pack is 54V.

[0206] It can be understood that power is equal to the product of voltage and current, and heat generation increases exponentially with the increase of current, the greater the current, the more the heat generation. Therefore, on the one hand, under the same current, the higher the voltage, the higher the power, i.e. under the same maximum current allowed by the battery pack, the higher output power can be achieved by the high voltage in the present embodiment; on the other hand, under the same output power, the higher the voltage, the lower the current, and the less the heat generation, i.e. under the same output power, the heat generation can be reduced by the high voltage in the present embodiment, thereby the temperature protection is not easily triggered, the motor can be continuously and stably operated under large power, the loss can be reduced, and the life of the battery pack is prolonged. The large power and light weight of the battery pack, and the large power and light weight of the whole machine can be achieved, and the requirements of large power and light weight can be considered.

[0207] In some embodiments, the rated current of the battery pack 40 is configured to be 30-200A. Illustratively, the rated current of the battery pack can be 30A, 40A, 50A, 60A, 70A, 80A, 100A, 120A, 140A, 150A, 180A, 200A, etc. Preferably, the rated current of the battery pack is 30-100A. In one specific embodiment, the rated current of the battery pack is 60A.

[0208] In some embodiments, the discharge rate of the battery pack 40 is 5-20C. Illustratively, the discharge rate of the battery pack can be 5C, 7.5C, 10C, 15C, 20C, etc. Alternatively, in some embodiments, the discharge rate of the battery pack is 7.5-12C. Illustratively, the discharge rate of the battery pack can be 7.5C, 10C, 12C, etc. As one specific example, the discharge rate of the battery pack is 10C. Wherein C is the multiple of the battery capacity, for example, a 1 Ah battery, if it discharges 1 Ah in 1 hour, then its discharge rate is 1C.

[0209] Generally speaking, the higher the discharge rate of the battery pack, the stronger the discharge capacity of the battery pack, the battery pack can release more electric energy in a shorter time, the discharge speed is fast, and the chain saw cutting efficiency is high. In addition, the full-tab battery cell has small internal resistance, less heat generation, large maximum current of the battery cell (the maximum current of the battery cell refers to the maximum current that the battery cell can withstand under certain conditions), large maximum discharge current allowed, and less total weight of the battery cell, thereby reducing the weight of the battery pack; with the same number of battery cells, a larger discharge current can be achieved, thereby achieving a larger output power under the same voltage. While achieving high power, light weight is also considered.

[0210] In some embodiments, the ratio of the rated output power of the battery pack 40 to the weight of the battery pack 40 (also referred to as the power density of the battery pack) is greater than or equal to 1167W / Kg. Illustratively, the power density of the battery pack 40 can be 1167W / Kg, 1200W / Kg, 1300W / Kg, 1334W / Kg, 1400W / Kg, 1500W / Kg, 1600W / Kg, etc. Alternatively, the ratio of the rated output power of the battery pack 40 to the weight of the battery pack 40 is greater than or equal to 1334W / Kg.

[0211] In some embodiments, the energy density of the battery pack 40 is greater than or equal to 135Wh / Kg. Illustratively, the energy density of the battery pack can be 135Wh / Kg, 140Wh / Kg, 150Wh / Kg, 160Wh / Kg, etc. Wherein the energy density of the battery pack is the electric energy that the battery pack can store in unit mass. It can be understood that the higher the energy density of the battery pack, the lighter the weight of the battery pack under the same capacity.

[0212] In some embodiments, the capacity of the battery pack 40 is configured to be 70-450 Wh. Exemplarily, the capacity of the battery pack can be 70 Wh, 120 Wh, 150 Wh, 180 Wh, 200 Wh, 240 Wh, 270 Wh, 300 Wh, 380 Wh, 450 Wh, etc. Alternatively, the capacity of the battery pack 40 is configured to be greater than or equal to 180 Wh and less than or equal to 300 Wh.

[0213] In one specific embodiment, the capacity of the battery pack is 240 Wh. The energy density of the battery pack is 150 Wh / Kg.

[0214] In some embodiments, the motor 30 is configured to be an outer rotor motor. In some embodiments, the weight of the motor 30 is 450-900 g. Exemplarily, the weight of the motor can be 450 g, 550 g, 600 g, 675 g, 700 g, 800 g, 900 g, etc. Alternatively, the weight of the motor 30 is 550-750 g. In one specific example, the weight of the motor is 675 g.

[0215] It can be understood that, compared with an inner rotor motor, an outer rotor motor has the characteristics of high efficiency, slow decrease of rotation speed with the increase of torque, small size, light weight under the same motor output power, etc. Therefore, it is more beneficial for the chain saw to output high power, to maintain high rotation speed under large torque, and to have better cutting performance, while meeting the demand for light weight.

[0216] In some embodiments, the battery pack is configured such that the maximum power that the motor can continuously output within 8-20 seconds is greater than or equal to 2400 W and less than or equal to 6000 W. Exemplarily, the maximum power that the motor can continuously output within 8-20 seconds can be 2400 W, 3000 W, 3600 W, 4800 W, 6000 W, etc.

[0217] It can be understood that the short-time output power of the motor can be higher than the output power of long-term work. The chain saw is an intermittent tool, and each operation time is relatively short, generally within 20 seconds. The short-time range is greater than the single cutting time, and the maximum power that the motor can output can also measure the maximum cutting capacity of the chain saw.

[0218] In some embodiments, referring to FIG. 1, the machine housing 10 includes a main housing 103 configured to accommodate the motor 30 and a battery pack accommodating portion 104 configured to accommodate the battery pack 40. The main handle 501 is arranged along the length extension direction L (X-axis direction) of the machine housing 10 and is disposed above the main housing 103 in the height extension direction H (Y-axis direction) of the chain saw. Alternatively, the battery pack 40 is detachably mounted in the battery pack accommodating portion 104.

[0219] In some embodiments, referring to FIG. 3, the cutting assembly 20 is mounted at one end of the machine housing 10 along the length extension direction L of the chain saw, and the machine housing 10 is provided with a hanging ring 90 at the end away from the cutting assembly 20 along the length extension direction L of the chain saw 100, and the hanging ring 90 is configured to attach the chain saw 100 to an external member.

[0220] The external member is configured as a safety rope and / or a self-locking hook. As an example, the guide plate 201 and the saw chain 202 are mounted at the front of the main housing 103 and at least partially extend out of the main housing 103, and the hanging ring 90 is arranged at the rear of the battery pack accommodating portion 104.

[0221] Referring to FIG. 4, in the scenario of using the chain saw for tree work, the user often carries the chain saw with him in the process of climbing or moving, so as to use the chain saw for work at any time after moving to the target position; at the same time, in order to ensure the safety of work, the chain saw often needs to be connected to a safety rope to avoid falling from a high altitude. By arranging the hanging ring, on the one hand, the safety rope can be connected through the hanging ring, and the other end of the safety rope is connected to a safety belt worn on the user's body or a certain fixed hanging position, which can avoid falling from a high altitude and also can be used for transporting the chain saw to the target position through the safety rope; on the other hand, the self-locking hook can be connected through the hanging ring, and the self-locking hook is usually attached to the safety belt or waistband worn on the operator's body, so that the user can carry the chain saw with him, and the user can free his hands in the process of climbing or moving, thereby improving the safety of work.

[0222] In a specific embodiment, the machine housing 10 is provided with a first hanging ring 901 and a second hanging ring 902, one of the first hanging ring 901 and the second hanging ring 902 is used for connecting the safety rope, and the other is used for connecting the self-locking hook. By arranging two hanging rings 90 for connecting the safety rope and the self-locking hook respectively, the user can use the chain saw for tree work more conveniently and safely.

[0223] The chain saw of the embodiment can output greater power while being lightweight, and is more agile and easier to use than the chain saw of the prior art under the same cutting performance.

[0224] In some embodiments, referring to FIG. 1, the chain saw further comprises an auxiliary handle 502 arranged at the left side of the machine housing 10, i.e. the side close to the user when the chain saw 100 is used. When used, the user usually holds the main handle 501 with the right hand and holds the auxiliary handle 502 with the left hand for work. The auxiliary handle 502 cooperates with the main handle 501 to facilitate the user to operate the chain saw.

[0225] Specifically, the casing 10 includes a left casing 1001 and a right casing 1002, the main handle 501 and the battery pack accommodating portion 104 are integrally formed with the casing 10, the upper portions of the left casing 1001 and the right casing 1002 form the main handle 501, and the rear portions of the left casing 1001 and the right casing 1002 form the battery pack accommodating portion 104.

[0226] During discharging, the voltage of the battery pack gradually decreases from full charge to empty charge, and the maximum output power of the battery pack gradually decreases, which may cause the chain saw to have sufficient power in a full charge state during use, and the power gradually decreases as the power decreases, and the user experiences a significant difference before and after.

[0227] To solve the technical problem, the chain saw provided by the application further includes a control panel configured to control the output power of the battery pack to be less than a power limit threshold, wherein the power limit threshold is less than the rated output power of the battery pack. Optionally, the power limit threshold is configured to be 50% to 80% of the rated output power of the battery pack. As a specific example, the rated output power of the battery pack is 3600W, and the power limit threshold is 2400W.

[0228] In this embodiment, by setting the power limit threshold and controlling the output power of the battery pack to be less than the power limit threshold, the output power of the chain saw can reach the power limit threshold or be relatively small even in a low power state during use, so that the output power of the chain saw does not change too much as the battery pack discharges, and the chain saw has stable output during the entire use process, and the user experience is better.

[0229] Referring to FIG. 2, the cutting assembly 20 of the chain saw further includes a safety cover 203 for covering the guide plate 201 and the saw chain 202 to avoid injury.

[0230] To balance the cutting performance and the lightweight requirement, referring to FIGS. 1 to 4, the application further provides a chain saw 100 including a casing 10, a cutting assembly 20, a motor 30, and a battery pack 40. The cutting assembly 20 is installed on the casing 10 and includes a guide plate 201 and a saw chain 202 arranged around the guide plate 201, the guide plate 201 providing support and guidance for the saw chain 202; the motor 30 is installed in the casing 10 and is configured to drive the saw chain 202 to move around the guide plate 201; the battery pack 40 is installed on the casing 10 and is configured to provide at least electrical energy for the motor 30. The ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100 is greater than or equal to 778W / Kg, wherein the bare machine weight of the chain saw 100 is the weight of the chain saw in a state where the guide plate 201, the saw chain 202, and the battery pack 40 are not assembled; the battery pack 40 includes a plurality of battery cells, and the battery cells are configured as full-tab battery cells; the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V.

[0231] The application also provides a chain saw 100, which comprises a housing 10, a cutting assembly 20, a motor 30, a battery pack 40, and a main handle 501. The cutting assembly 20 is mounted on the housing 10 and comprises a guide plate 201 and a saw chain 202 arranged around the guide plate 201, and the guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is mounted in the housing 10 and is configured to drive the saw chain 202 to move around the guide plate 201. The battery pack 40 is mounted on the housing 10 and is configured to provide power to at least the motor 30. The main handle 501 is arranged along the length extension direction L of the chain saw, and the main handle 501 comprises a holding section for a user to hold. The battery pack 40 comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells. The rated voltage of the battery pack 40 is greater than 40 V and less than or equal to 100 V. The motor 30 is configured as an external rotor motor.

[0232] In the application, the holding section of the main handle 501 is a part that can be gripped by a user's hand and lifted to perform a cutting operation, and a part that is difficult for a user to grip or is inconvenient to perform a cutting operation when gripped should not be regarded as a holding section.

[0233] It can be understood that the technical solution of the embodiment adopts full-tab battery cells for the battery pack 40, sets the battery pack 40 as high voltage, and adopts an external rotor motor for the motor 30, which is beneficial to meet the requirements of high power and light weight on the one hand, and can improve the cutting efficiency of the chain saw on the other hand. For users, high power can also improve cutting efficiency and shorten working time, thereby creating greater economic benefits for the garden team.

[0234] In some embodiments, referring to FIGS. 1 to 4, the holding section of the main handle 501 is at least partially arranged above the motor 30 in the height extension direction of the chain saw. The rated input power of the motor 30 is greater than or equal to 1200 W and less than or equal to 3200 W.

[0235] Further, the rated input power of the motor is greater than or equal to 1200 W and less than or equal to 3200 W, and the bare machine weight of the chain saw is less than or equal to 3 Kg. For example, the rated input power of the motor 30 can be 1200 W, 1300 W, 1400 W, 1500 W, 1600 W, 1800 W, 2000 W, 2400 W, 2500 W, 2800 W, 3000 W, 3200 W, etc., and the bare machine weight of the chain saw can be 1.5 Kg, 1.8 Kg, 2 Kg, 2.55 Kg, 2.6 Kg, 2.7 Kg, 2.8 Kg, 3 Kg, etc.

[0236] In some embodiments, referring to FIG. 17, the battery pack 40 includes a front side 401 close to the cutting assembly 20 and a rear side 402 away from the cutting assembly 20 in the length extension direction L of the chain saw 100, one side of the front side 401 of the battery pack 40 is defined as a front side front area F1 and the other side is defined as a front side rear area F2, the cutting assembly 20 and the holding section of the main handle 501 are both located in the front side front area F1, and the rear side 402 of the battery pack 40 is located in the front side rear area F2; the rated input power of the motor 30 is greater than or equal to 600 W and less than or equal to 1200 W.

[0237] Further, the rated input power of the motor is greater than or equal to 600 W and less than or equal to 1200 W, and the naked machine weight of the chain saw is greater than or equal to 1 Kg and less than or equal to 2 Kg. For example, the rated input power of the motor 30 can be 600 W, 630 W, 700 W, 750 W, 800 W, 850 W, 900 W, 930 W, 960 W, 1000 W, 1100 W, 1200 W, etc., and the naked machine weight of the chain saw can be 1 Kg, 1.05 Kg, 1.1 Kg, 1.2 Kg, 1.3 Kg, 1.38 Kg, 1.4 Kg, 1.45 Kg, 1.5 Kg, 1.6 Kg, 1.7 Kg, 1.8 Kg, 1.9 Kg, 2 Kg, etc.

[0238] In some embodiments, the rated input power of the motor is greater than or equal to 600 W and less than or equal to 900 W, and the naked machine weight is greater than or equal to 1 Kg and less than or equal to 1.5 Kg. For example, the rated input power of the motor is 600 W and the naked machine weight is 1.05 Kg; for another example, the rated input power of the motor is 630 W and the naked machine weight is 1.38 Kg; for still another example, the rated input power of the motor is 850 W and the naked machine weight is 1.45 Kg.

[0239] In some other embodiments, the rated input power of the motor is greater than or equal to 900 W and less than or equal to 1200 W, and the naked machine weight is greater than or equal to 1 Kg and less than or equal to 2 Kg. For example, the rated input power of the motor is 930 W and the naked machine weight is 1.1 Kg; for another example, the rated input power of the motor is 960 W and the naked machine weight is 1.9 Kg; for still another example, the rated input power of the motor is 1200 W and the naked machine weight is 2 Kg.

[0240] Further, referring to FIG. 17, the motor 30 of the chain saw is arranged above the cutting assembly 20. It can be understood that this structure can make full use of the space, so that the chain saw is more compact in the length extension direction L. It can be understood that the chain saw of the present embodiment is a small-power chain saw, and users have certain demands in terms of small size, light weight and portability. Therefore, it is necessary to balance the cutting capacity of the chain saw in the case of compact structure and light weight.

[0241] Based on this, the technical features of the foregoing embodiments or combinations of technical features can be applied to the present embodiment as long as there is no contradiction or mutual conflict. In order to make the description brief, all possible combinations of technical features in the foregoing embodiments are not described.

[0242] The technical features of the above embodiments can be combined in any manner. In order to make the description brief, all possible combinations of technical features in the foregoing embodiments are not described, however, as long as the combinations of technical features do not contradict or conflict with each other, they can be freely combined and applied in the same embodiment.

[0243] It can be understood that, when the motor is running, high power will bring higher temperature rise than small power running condition. Therefore, in order to meet the requirement of high power, it is likely to cause the increase of temperature rise. If the operation temperature exceeds a certain temperature, it will cause the tool to burn or reduce the service life. High heat will also trigger temperature protection, so that the tool cannot continue to run. Therefore, in order to ensure the continuous operation of the tool and long service life, it is necessary to maintain the temperature below the safe temperature point (referred to as temperature rise stabilization) without triggering temperature protection, and to increase the power.

[0244] To solve the above technical problems, the application also provides a chain saw with good heat dissipation performance, which can reduce temperature rise, increase power under the premise of temperature rise stabilization, so that the chain saw can continue to run safely under high power output without triggering temperature protection.

[0245] Referring to FIGS. 1-3, the chain saw 100 extends along three orthogonal spatial directions of length extension direction L, width extension direction W, and height extension direction H. The chain saw 100 includes a machine shell 10, a cutting assembly 20, a motor 30, and a battery pack containing portion 104. The cutting assembly 20 is installed on the machine shell 10, and the cutting assembly 20 includes a guide plate 201 and a saw chain 202 arranged around the guide plate 201. The guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is installed in the machine shell 10 and is configured to drive the saw chain 202 to move around the guide plate 201. The battery pack containing portion 104 is configured to contain a battery pack 40, and the battery pack 40 is configured to provide at least electrical energy to the motor 30.

[0246] The rated output power of the motor 30 is greater than or equal to 1600W and less than or equal to 3200W; the bare machine weight of the chain saw is less than or equal to 3.5Kg, wherein the bare machine weight of the chain saw 100 is the weight of the chain saw in the state of not assembling the guide plate 201, the saw chain 202, and the battery pack 10.

[0247] Referring to FIG. 14, the chain saw 100 further comprises an electronic control device 60 and a temperature detection device 70. The electronic control device 60 is configured to at least control the start and stop of the motor 30; the temperature detection device 70 is arranged on the electronic control device 60 and is in communication connection with the electronic control device 60, and the temperature detection device 70 is configured to collect temperature data of the electronic control device 60. The electronic control device 60 is configured to:

[0248] Step S1, receiving the temperature data of the electronic control device 60 sent by the temperature detection device 70;

[0249] Step S2, comparing the temperature data of the electronic control device 60 with a preset temperature threshold to determine whether the temperature protection condition is met;

[0250] Step S3, when the temperature protection condition is met, performing a temperature protection action;

[0251] The preset temperature threshold is less than or equal to 150°C.

[0252] It can be understood that the preset temperature threshold is set according to a safe temperature point, and by setting the temperature protection, the chain saw can be ensured to work below the safe temperature point. According to actual needs, the preset temperature threshold is configured to be within a temperature range that does not damage the motor 30 and the components of the electronic control device 60, does not cause the tool to burn, and does not affect the service life of the chain saw.

[0253] The chain saw of the embodiment can balance high power and light weight under stable temperature rise.

[0254] Each technical feature of the foregoing embodiments can be applied to the chain saw of the present embodiment. In order to make the description concise, all possible combinations of technical features are not described, however, as long as the combinations of technical features do not contradict or conflict with each other, they can be freely combined and applied to the same embodiment.

[0255] Further, the bare machine weight of the chain saw can be 1.5 Kg, 1.8 Kg, 2 Kg, 2.2 Kg, 2.35 Kg, 2.55 Kg, 2.7 Kg, 2.8 Kg, 3 Kg, 3.5 Kg, etc. Alternatively, the bare machine weight of the chain saw is less than 3 Kg. Still alternatively, the bare machine weight of the chain saw is less than or equal to 2.7 Kg.

[0256] In some embodiments, the ratio of the rated output power of the motor 30 to the bare machine weight of the chain saw is greater than 800 W / Kg. For example, the ratio of the rated input power of the motor 30 to the bare machine weight of the chain saw 100 can be 801 W / Kg, 850 W / Kg, 900 W / Kg, 940 W / Kg, 1000 W / Kg, 1070 W / Kg, etc.

[0257] Further, the rated output power of the motor 30 can be 1600W, 1800W, 2000W, 2100W, 2400W, 3000W, 3200W, etc. Alternatively, the rated input power of the motor is greater than or equal to 2100W.

[0258] Alternatively, the rated output power of the motor 30 is greater than or equal to 2100W and less than or equal to 3000W; the bare machine weight of the chain saw 100 is less than or equal to 3Kg.

[0259] Further, the preset temperature threshold can be 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, etc. Alternatively, the preset temperature threshold is greater than or equal to 80℃ and less than or equal to 130℃.

[0260] In some embodiments, the temperature protection condition is configured that the temperature data of the electronic control device is greater than or equal to the preset temperature threshold. That is, whether the temperature data of the electronic control device is greater than or equal to the preset temperature threshold is judged, if yes, the temperature protection condition is met, otherwise, the temperature protection condition is not met. Specifically, the electronic control device 60 compares the temperature data of the electronic control device 60 with the preset temperature threshold, and when the temperature data of the electronic control device 60 is greater than or equal to the preset temperature threshold, the temperature protection action is performed.

[0261] In some embodiments, the temperature protection action is configured to control the motor 30 to stop. That is, the electronic control device 60 compares the temperature data of the electronic control device 60 with the preset temperature threshold, and when the temperature protection condition is met, the motor 30 is controlled to stop.

[0262] In some embodiments, referring to FIG. 15, the electronic control device 60 is further configured to control the motor 30 to restart when the temperature data of the electronic control device 60 is less than a preset recovery threshold in the stopped state of the motor, and the preset recovery threshold is less than the preset temperature threshold. By setting this step, the chain saw can automatically restart when the temperature drops below the safe temperature point, so that the user can quickly and simply know that the tool can continue to be used.

[0263] As a specific example, the preset temperature threshold is 110℃ and the preset recovery threshold is 100℃. As another specific example, the preset temperature threshold is 105℃ and the preset recovery threshold is 95℃. As still another specific example, the preset temperature threshold is 110℃ and the preset recovery threshold is 105℃.

[0264] In one specific example, referring to FIG. 12, the electronic control device 60 comprises a control board 601, and the control board 601 comprises a MOS tube 6011. The temperature detection device 70 is configured as a temperature sensor 701, and the temperature sensor 701 is attached to the MOS tube 6011. It can be understood that the MOS tube generates more heat due to frequent work, and the MOS tube is the main heat generating element. Before the MOS tube reaches the preset temperature threshold, the motor 30 and other electronic elements of the control board 601 will not reach the preset temperature threshold. Therefore, by detecting the temperature of the MOS tube 6011 through the temperature sensor 70 and setting a corresponding control strategy, it can be ensured that the motor 30 and the electronic control device 60 can work below the safe temperature point.

[0265] Referring to FIG. 15, the temperature control method of the control board specifically comprises:

[0266] Step S1.1, receiving the temperature data of the control board 601 sent by the temperature sensor 701;

[0267] Step S2.1, comparing the received temperature data of the control board 601 with the preset temperature threshold, when judging whether the temperature data of the control board 601 is greater than or equal to the preset temperature threshold, such as greater, it is determined that the temperature protection condition is met, otherwise, it is determined that the temperature protection condition is not met;

[0268] Step S3.1, when the temperature data of the control board is greater than or equal to the preset temperature threshold, the motor is controlled to stop;

[0269] When the temperature data of the control board is less than the preset recovery threshold, the motor 30 is restarted under the control of the motor in the stopped state.

[0270] Among them, the preset temperature threshold is set to 110°C, and the preset recovery threshold is set to 100°C.

[0271] It can be understood that in order to improve the power while keeping the temperature rise stable, one possible solution is to improve the heat dissipation effect, and another possible solution is to reduce the heat generation. High power will bring higher temperature rise. Even if the battery pack and the motor can provide high power, if the chain saw itself cannot meet the heat dissipation requirement, the chain saw will not be able to run at high power due to overheating. During the operation of the chain saw, the motor 30 and the electronic control device 60 are the main heat sources. In order to avoid the situation that the chain saw 100 stops due to overheating, it is necessary to consider more effective heat dissipation for the motor 30 and the electronic control device 60 in the machine housing 10.

[0272] In order to reduce heat generation, the battery pack 40 includes a plurality of battery cells, and the battery cells are full tab battery cells. The full tab battery cell has the advantage of small internal resistance, and thus generates less heat under the same discharge current. Less heat generation allows the battery pack to maintain a low temperature rise under a larger discharge current, i.e., the battery pack can safely operate under a larger discharge current, and the output power of the battery pack can be increased under the same voltage. In addition, it can be understood that for the battery pack, since the maximum current carrying capacity of the battery cell is limited, i.e., the maximum current that the battery cell can withstand under certain conditions is limited, in order to increase the power of the battery pack under the condition that the required voltage of the battery pack is fixed, more battery cells are often needed, which will increase the weight of the battery pack and is not conducive to the lightweight of the whole machine. The full tab battery cell has a large current carrying capacity, and the same output power can be achieved with fewer battery cells, which is conducive to the lightweight of the whole machine.

[0273] In some embodiments, the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. For example, the rated voltage of the battery pack can be 36V, 38V, 40V, 48V, 54V, 60V, 80V, 100V, etc. Alternatively, the rated voltage of the battery pack 40 is greater than 40V and less than or equal to 100V. Preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 100V. More preferably, the rated voltage of the battery pack is greater than or equal to 48V and less than or equal to 80V. In a specific embodiment, the rated voltage of the battery pack is 54V.

[0274] It can be understood that power is equal to the product of voltage and current, and the greater the current, the more heat is generated. Therefore, under the same output power, the higher the voltage, the lower the current, and the less heat is generated, i.e., under the same output power, the present embodiment can reduce heat generation by using high voltage, thereby avoiding triggering temperature protection, ensuring that the motor can continuously and stably operate under high power, reducing loss, and prolonging the service life of the battery pack.

[0275] Further, the discharge rate of the battery pack is 5-20C. For example, the discharge rate of the battery pack can be 5C, 7.5C, 10C, 15C, 20C, etc. Alternatively, in some embodiments, the discharge rate of the battery pack is 7.5-12C. For example, the discharge rate of the battery pack can be 7.5C, 10C, 12C, etc. As a specific example, the discharge rate of the battery pack is 10C. Wherein C is the multiple of battery capacity, for example, a 1 Ah battery, if it discharges 1 Ah of electricity in 1 hour, then its discharge rate is 1C.

[0276] It can be understood that the higher the discharge rate of the battery pack, the stronger the discharge capacity of the battery pack, and the battery pack can release more electric energy in a shorter time, with fast discharge speed and high tool cutting efficiency.

[0277] To improve the heat dissipation effect of the tool, in some embodiments, referring to FIGS. 5-9, the electronic control device 60 is arranged in the housing 10, the housing 10 is provided with an air inlet 802 and an air outlet 803 which are in communication with the outside; the chain saw further comprises an axial flow fan 801 arranged in the housing 10 and configured to suck cooling air from the air inlet 802 into the interior of the housing 10; the motor 30 is connected to and drives the axial flow fan 801 to rotate about a fan axis F; the orthogonal projection of the axial flow fan 801 on a first plane P1 at least partially overlaps or is tangent to the orthogonal projection of the electronic control device 60 on the first plane P1, the first plane P1 is a plane perpendicular to the fan axis F and parallel to the height extension direction H; and in the extension direction of the fan axis F, the axial spacing L1 between the axial flow fan 801 and the electronic control device 60 is configured to be less than or equal to 50 mm.

[0278] Further, the axial spacing L1 between the axial flow fan 801 and the electronic control device 60 is configured to be 2-50 mm. Alternatively, the axial spacing L1 can be configured to be 2-10 mm; or the axial spacing L1 can be configured to be 10-16.8 mm; or the axial spacing L1 can be configured to be 16.8-20 mm; or the axial spacing L1 can be configured to be 20-35 mm; or the axial spacing L1 can be configured to be 35-40 mm; or the axial spacing L1 can be configured to be 40-50 mm. Exemplarily, the axial spacing L1 can be configured to be 2 mm, 5 mm, 8 mm, 11 mm, 13 mm, 15 mm, 16 mm, 16.8 mm, 17 mm, 18 mm, 22 mm, 28 mm, 33 mm, 35 mm, 36 mm, 38 mm, 40 mm, 43 mm, 45 mm, 47 mm, 48 mm, 50 mm, and preferably, the axial spacing L1 is configured to be 16.8 mm.

[0279] It can be understood that, under the premise that the position of the motor 30 relative to the axial flow fan 801 remains unchanged, further arranging the electronic control device 60 closer to the axial flow fan 801, the closer the electronic control device 60 is to the axial flow fan 801, the greater the flow area of the cooling air on the surface of the electronic control device 60 and the greater the air volume flowing through, and the better the cooling effect, but if the distance between the two is too small, the axial flow fan 801 is prone to deformation after long-time operation, and the edges of the fan blades of the axial flow fan 801 can scratch the electronic control device 60, causing unnecessary damage to the axial flow fan 801 and the electronic control device 60. The technical solution of the present embodiment can not only increase the flow area of the cooling air blown out by the outflow side S2 of the axial flow fan 801 on the electronic control device 30, increase the air volume, and have better heat dissipation effect, but also can reserve a safe distance between the axial flow fan 801 and the electronic control device 60, so as to avoid scratching the electronic control device 60 due to deformation of the fan blades of the axial flow fan 801.

[0280] In some embodiments, the axial flow fan 801 includes an air inlet side W1 and an air outlet side W2 located respectively on the two axial sides of the axial flow fan 801; the motor 30 and the electronic control device 60 are both arranged on the air outlet side W2 of the axial flow fan 801; the orthographic projection of the motor 30 on the second plane P2 is at least partially within the orthographic projection of the electronic control device 60 on the second plane P2, and the second plane P2 is parallel to both the fan axis F and the height extension direction H.

[0281] In some embodiments, the motor 30 includes a motor outer wall 303 extending in the axial direction of the power output shaft of the motor 30; the electronic control device 60 includes a heat dissipation plate 602 arranged opposite to the motor outer wall 303 in the length extension direction L, the heat dissipation plate 602 extends substantially along a heat dissipation plane 6021 (also referred to as a heat dissipation surface), and the fan axis F is substantially parallel to the heat dissipation plane 6021; the shortest distance L2 from the fan axis F to the heat dissipation plane 6021 is configured to be 33mm-43.5mm.

[0282] In some embodiments, the orthographic projection of the rotation surface of the axial flow fan 801 on the first plane P1 is defined as a projection circle R, and the ratio L2:r1 of the shortest distance L2 from the fan axis F to the heat dissipation plane 6021 to the radius r1 of the projection circle R is configured to be greater than 1 and less than or equal to 2.5.

[0283] In some embodiments, the electronic control device 60 includes a control board 601 and a heat dissipation plate 602, the heat dissipation plate 602 is configured to conduct and dissipate the heat emitted by the control board 601 to the surrounding air to achieve heat dissipation for the control board 601; the control board 601 includes a MOS tube 6011 thereon; the orthographic projection of the motor outer wall 303 on the second plane P2 and the orthographic projection of the heat dissipation plate 602 on the second plane P2 at least partially overlap, and the orthographic projection of the MOS tube 6011 on the second plane P2 is at least partially within the overlapping area.

[0284] In some embodiments, in the extension direction of the fan axis F, the axial spacing D3 between the MOS tube 6011 and the axial flow fan 801 is configured to be 10mm-80mm.

[0285] In some embodiments, the orthographic projection of the fan axis F on the first plane P1 is a projection point U, the orthographic projection of the MOS tube 6011 on the first plane P1 is a projection M, and the shortest distance D4 from the projection point U to the projection M is configured to be 33mm-44mm.

[0286] Further, referring to FIG. 12, the control board 601 comprises a MOS tube 6011. The orthogonal projection of the MOS tube 6011 on a preset plane is located within the region LX defined by the orthogonal projection of the motor on the preset plane PX, and the vertical distance of the orthogonal projection of the MOS tube 6011 on the preset plane PX relative to the orthogonal projection of the fan axis F on the preset plane PX is less than or equal to 10 mm, wherein the preset plane PX is perpendicular to the plane perpendicular to the fan axis F; and / or the distance D3 between the projection of the MOS tube 6011 on the fan axis F and the projection of the axial flow fan 801 on the fan axis F is configured to be 10 mm to 50 mm. The heat dissipation plate 602 is arranged parallel to the fan axis F. It can be understood that the MOS tube generates more heat due to frequent operation, and the MOS tube is the main heat generating element of the electronic control device. By arranging the MOS tube in the region with high airflow velocity in the radial direction of the motor and / or in the axial direction of the motor, the heat dissipation effect can be effectively improved. That is, the MOS tube 6011 is arranged in the projected region of the motor diameter, and the MOS tube 6011 is arranged closer to the air outlet, so that the air volume is larger, the airflow velocity is higher, the temperature is lower, and the heat dissipation effect is better.

[0287] Alternatively, the vertical distance of the orthogonal projection of the MOS tube 6011 on the preset plane relative to the orthogonal projection of the fan axis F on the preset plane is less than or equal to 5 mm. The distance D3 between the projection of the MOS tube on the fan axis and the projection of the axial flow fan on the fan axis is configured to be 10 mm to 30 mm. As a specific example, the distance D3 between the projection of the MOS tube on the fan axis and the projection of the axial flow fan on the fan axis is configured to be 20 mm. By arranging the MOS tube at this position, the heat dissipation effect is more optimal. In one specific embodiment, the extension direction of the heat dissipation plate 602 is parallel to the preset plane PX.

[0288] Further, referring to FIG. 9, in the extension direction of the fan axis F, the axial distance D1 between the end surface of the motor 30 close to the axial flow fan 801 and the end surface of the axial flow fan 801 close to the motor 30 is 0.5 mm to 6 mm. For example, the axial distance D1 between the end surface of the motor close to the axial flow fan and the end surface of the axial flow fan close to the motor can be 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, etc. Alternatively, the axial distance D1 between the end surface of the motor close to the axial flow fan and the end surface of the axial flow fan close to the motor is 1 mm to 3 mm. In one specific example, the axial distance D1 between the end surface of the motor close to the axial flow fan and the end surface of the axial flow fan close to the motor is 2.2 mm. It can be understood that since the airflow of the axial flow fan is axially in and out, by making the axial distance between the axial flow fan and the motor small, the wood chips can be prevented from entering the interior of the motor and affecting the normal operation of the motor.

[0289] The included angle between the connecting line from any position on the MOS tube to the axial end face center of the axial flow fan located at the air outlet side and the fan axis is 10°-60°, preferably, the included angle is 20°-50°.

[0290] Further, referring to FIG. 12, the heat dissipation surface 6021 is arranged parallel to the fan axis F, and the vertical distance D2 from the tangent line of the motor to the heat dissipation surface in the plane parallel to the heat dissipation surface and tangent to the motor is configured to be 1 mm-40 mm, for example, D2 can be configured to be 1 mm, 5 mm, 8 mm, 10 mm, 20 mm, 30 mm, 40 mm, etc. Preferably, D2 is configured to be 2 mm-10 mm. In one specific example, D2 is configured to be 6.5 mm. It can be understood that by keeping the heat dissipation plate at an appropriate distance from the motor, the heat dissipation plate can avoid being too far from the motor, resulting in small air volume and low air speed, affecting the heat dissipation effect of the heat dissipation plate.

[0291] In some embodiments, referring to FIG. 9, the axial flow fan 801 is mounted on the power output shaft of the motor 30, the motor 30 drives the axial flow fan 801 to rotate around the fan axis F, and the power output shaft of the motor 30 coincides with the fan axis F; the motor outer wall 303 includes a front end portion 3031 arranged close to the axial flow fan 801 in the extension direction of the fan axis F and a rear end portion 3032 arranged away from the axial flow fan 801; in the extension direction of the fan axis F, the axial spacing D1 between the front end portion of the motor outer wall 303 and the axial flow fan 801 is configured to be 0.5 mm-6 mm.

[0292] In some embodiments, the axial spacing D1 can be configured to be 0.5 mm-1 mm; in some embodiments, the axial spacing D1 can be configured to be 1 mm-2 mm; in some embodiments, the axial spacing D1 can be configured to be 2 mm-3 mm; in yet some embodiments, the axial spacing D1 can be configured to be 3 mm-4 mm; in yet some embodiments, the axial spacing D1 can be configured to be 4 mm-5 mm; in yet some embodiments, the axial spacing D1 can be configured to be 5 mm-6 mm; in some embodiments, the axial spacing D1 can be configured to be 0.5 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3.2 mm, 3.5 mm, 3.9 mm, 4.2 mm, 4.5 mm, 5.2 mm, 5.6 mm, 6 mm, preferably, the axial spacing D1 can be configured to be 2.2 mm.

[0293] In some embodiments, referring to FIG. 9, the housing 10 forms an internal accommodating space 101, the axial flow fan 801, the motor 30, and the electronic control device 60 are all arranged in the internal accommodating space 101; a region between the front end of the motor outer wall 303 and the axial flow fan 801 forms an air flow low pressure area T2, the front end of the motor outer wall 303 is provided with an air flow outlet 304 which is in communication with the air flow low pressure area T2, and the rear end of the motor outer wall 303 is provided with an air flow inlet (not shown) which is in communication with the internal accommodating space 101 of the housing 10; the cooling air flowing out of the air outlet side W2 of the axial flow fan 801 flows through the surface of the motor outer wall 303, and at least part of the cooling air enters the interior of the motor 30 from the air flow inlet and flows out of the air flow outlet 304 into the air flow low pressure area T2.

[0294] In this way, after the cooling air flowing out of the air outlet side W2 of the axial flow fan 801 flows through the surface of the motor outer wall 303, at least part of the cooling air enters the interior of the motor outer wall 303 from the air flow inlet and flows out of the air flow outlet 304 into the air flow low pressure area T2. It can be understood that most of the cooling air blown by the air outlet side W2 of the axial flow fan 801 flows through the surface of the motor outer wall 303 along the fan axis F direction, which can reduce the amount of cooling air directly entering the interior of the motor 30 along the fan axis F direction.

[0295] In some embodiments, referring to FIGS. 6-8, the electronic control device 60 is arranged in the housing 10, and the housing 10 is provided with an air inlet 802 and an air outlet 803 which are in communication with the outside; the chain saw 100 further comprises an axial flow fan 801 arranged in the housing 10 and configured to suck cooling air from the air inlet 802 into the interior of the housing 10 and discharge the cooling air from the air outlet 803 to the outside of the housing 10; a flow path of the cooling air flowing from the axial flow fan 801 to the air outlet 803 is defined as an air outlet path; the motor 30 is connected and drives the axial flow fan 801 to rotate around the fan axis F, and the motor 30 comprises a motor outer wall 303 extending in the axial direction of the power output shaft of the motor 30; the electronic control device 60 is arranged on the air outlet path, and the electronic control device 60 comprises a heat dissipation plate 602 arranged opposite to the motor outer wall 303 in the length extension direction L, the heat dissipation plate 602 extends substantially along a heat dissipation plane 6021, and the heat dissipation plane 6021 is arranged obliquely or perpendicularly relative to the reference plane P.

[0296] Referring to FIGS. 18a-18d, the orthographic projection of the rotation plane of the axial fan 801 on the first plane P1 is a projection circle R, the projection circle R includes an upper half circle Rup and a lower half circle Rdown in the height extension direction H, the orthographic projection of the heat sink 602 on the first plane P1 includes an uppermost end point B1 and a lowermost end point B2 in the height extension direction H, a tangent line C1 and a tangent line C2 are drawn from the uppermost end point B1 and the lowermost end point B2 to the lower half circle Rdown of the projection circle R, respectively, the included angle ∑ opposite to the heat sink 602 formed between the tangent line C1 and the tangent line C2 is configured to be greater than or equal to 15°, and the first plane P1 is a plane perpendicular to the fan axis F and parallel to the height extension direction H. It can be understood that a boundary line A2 perpendicular to the height extension direction H is drawn from the center of the projection circle R, the portion of the projection circle R above the boundary line A2 is the upper half circle Rup, and the portion of the projection circle R below the boundary line A2 is the lower half circle Rdown.

[0297] The electronic control device 60 can be arranged at any position meeting the above conditions under the premise that the housing 10 meets the accommodation requirements. In some embodiments, the included angle ∑ can be configured to be 15°-30°; in some embodiments, the included angle ∑ can be configured to be 30°-60°; in some embodiments, the included angle ∑ can be configured to be 60°-90°; in some embodiments, the included angle ∑ can be configured to be 60°-90°; in some embodiments, the included angle ∑ can be configured to be 90°-120°; and in some embodiments, the included angle ∑ can be configured to be 120°-150°. In this way, the cooling air blown out by the outflow side W2 of the axial fan 801 is blown out in the direction of the rotation axis F and in the tangential direction of the outer edge of the axial fan 801, and the blown-out cooling air can flow through the motor outer wall 303 and the surface of most of the heat sink 602.

[0298] In some embodiments, the orthographic projection of the electronic control device 60 on the reference plane P at least partially overlaps the orthographic projection of the motor on the reference plane P.

[0299] The axial flow fan 801 is configured to draw air into the casing 10 from the air inlet 802, flow through the motor 30 and the electronic control device 60, and discharge to the outside of the casing 10 from the air outlet 803. The heat sink 602 is arranged at an angle of 5°-175° with respect to a plane parallel to both the fan axis F and the length extension direction L of the chain saw 100. Exemplarily, the angle can be 5°, 15°, 30°, 75°, 90°, 160°, 175°, etc. It can be understood that by arranging the heat sink 602 of the electronic control device 60 at an angle, the accumulation of wood chips on the surface of the heat sink 602 during the cutting of the chain saw 100 is avoided, which affects the heat dissipation effect. Alternatively, the heat sink 602 is arranged at an angle of 30°-150° with respect to a plane parallel to both the fan axis F and the length extension direction L of the chain saw 100. Exemplarily, the angle can be 30°, 45°, 60°, 75°, 90°, 120°, 150°, etc.

[0300] Alternatively, the heat sink 602 is arranged upwardly inclined. Both the accumulation of wood chips and the better guidance of wood chips falling on the heat sink 602 along the heat sink 602 are avoided, which will not cause the phenomenon of wood chips flying around. As a specific example, the heat sink 602 is arranged upwardly inclined and at an angle of 60° with respect to a plane parallel to both the fan axis F and the length extension direction L of the chain saw.

[0301] Further, in some embodiments, the battery pack 40 is slidingly mounted to the casing 10, and the insertion direction of the battery pack 40 with respect to the casing 10 is substantially parallel to the inclination direction of the electronic control device 60. It can be understood that such arrangement can effectively utilize the layout space of the casing 10, make the chain saw 100 more compact, and thus reduce the length dimension of the casing, reduce the material cost of the casing, and be conducive to the lightweight of the chain saw.

[0302] In some embodiments, referring to FIGS. 6 and 9, the surface of the heat sink 602 is provided with a plurality of heat dissipation ribs 6022 protruding towards the motor 30, and the plurality of heat dissipation ribs 6022 are arranged at intervals; the heat dissipation ribs 6022 are configured to extend along a direction at an angle of 5°-175° with respect to the first plane P1, or are arranged vertically with respect to the fan axis F, so that the debris falls along the heat dissipation ribs 6022. It can be understood that the heat dissipation ribs 6022 are arranged inclined or vertically on the surface of the heat sink 602, so that the debris can fall along the heat dissipation ribs 6022 under the action of gravity, and the accumulation of debris on the heat sink 602 is avoided, which affects the heat dissipation effect.

[0303] Optionally, the heat sink ribs 6022 extend in a direction that forms an angle of 10°-170° with respect to a plane parallel to the fan axis F and the length extension direction L of the chainsaw. Further optionally, the heat sink ribs 6022 extend in a direction that forms an angle of 30°-150° with respect to a plane parallel to the fan axis F and the length extension direction L of the chainsaw. Exemplarily, the angle can be 30°, 45°, 60°, 75°, 90°, 120°, 150°, etc. Preferably, the heat sink ribs 6022 extend in a direction perpendicular to the fan axis F. This is more conducive to guiding the wood chips to slide linearly under the action of gravity with minimal resistance.

[0304] When the cooling air flows over the outer wall 303 of the motor and the surface of the heat sink plate 602 of the electronic control device 60, the dust and debris attached in the cooling air will fall to the bottom surface 1003 of the machine housing 10 under the action of gravity, so that the dust and debris attached to the heat sink plate 602 can also slide to the bottom surface 1003 of the machine housing 10 under the action of gravity and / or wind due to the inclined arrangement of the electronic control device 60, the heat sink plate 602, and the heat sink ribs 6022.

[0305] Based on the above arrangement of the electronic control device 60, the motor 30, and the axial flow fan 801, the dust and debris that enter the inside of the machine housing 10 along with the cooling air can fall to the bottom surface 1003 of the machine housing 10 under the action of gravity and / or wind, avoiding accumulation in the heat sink plate 602 of the electronic control device 60 and the inside of the motor 30, and affecting the heat dissipation effect of the two.

[0306] In some embodiments, referring to FIG. 6, the machine housing 10 is provided with a chip removal opening 804 that communicates with the outside at the bottom away from the main handle 501 in the height extension direction H, and the orthographic projection of the heat sink plate 602 on the reference plane P at least partially coincides with or is tangent to the orthographic projection of the chip removal opening 804 on the reference plane P. That is, the chip removal opening 804 is provided on the bottom surface 1003 of the machine housing 10.

[0307] In some embodiments, the orthographic projection of the outer wall 303 of the motor on the reference plane P at least partially coincides with the orthographic projection of the chip removal opening 804 on the reference plane P.

[0308] It can be understood that the chip removal opening 804 is provided at the bottom of the machine housing 10, which is conducive to removing the debris and avoiding the accumulation or blockage of the debris inside the machine housing 10 to affect heat dissipation.

[0309] Referring to FIG. 6, the air inlet 802 is provided on one side surface of the machine housing 10, and the air outlet 803 is provided at the bottom of the machine housing 10. The air outlet 803 is provided at the bottom of the machine housing 10, and the air outlet is unobstructed, which can improve the heat dissipation effect. In some embodiments, at least part of the chip removal opening 804 constitutes the air outlet 803, that is, the air outlet 803 has the function of removing chips. In other embodiments, the chip removal opening 804 and the air outlet 803 are independently provided.

[0310] In some embodiments, referring to Figs. 6-8, the electronic control device 60 is disposed in the housing 10, the housing 10 is provided with an air inlet 802 and an air outlet 803 which are in communication with the outside; the chain saw 100 further comprises an axial flow fan 801 which is disposed in the housing 10 and is configured to suck cooling air from the air inlet 802 into the interior of the housing 10, the axial flow fan 801 comprises an air inlet side W1 and an air outlet side W2 which are respectively located on the two axial sides of the axial flow fan 801; the motor 30 and the electronic control device 60 are both disposed on the air outlet side W2 of the axial flow fan 801. The motor 30 is connected and drives the axial flow fan 801 to rotate around a fan axis F, the motor 30 comprises a motor outer wall 303 which extends in the axial direction of the power output shaft of the motor 30; the electronic control device 60 comprises a heat sink 602 which is disposed opposite to the motor outer wall 303 in the length extension direction L; an airflow passage T1 is formed between the heat sink 602 and the motor outer wall 303. The axial flow fan 801 is configured to make the cooling air flow from the air inlet side W1 to the air outlet side W2 of the axial flow fan 801 and flow through the airflow passage T1, the cooling air flows through the motor outer wall 303 while also flowing through at least part of the heat sink 602.

[0311] It can be understood that the air outlet of the axial flow fan 801 can flow through the motor 30 and the electronic control device 60 at the same time, thereby improving the heat dissipation efficiency.

[0312] Referring to Fig. 10, the axial flow fan 801 comprises a plurality of fan blades 8011, the outermost edges of the fan blades 8011 rotate around the fan axis F to form a circular surface 8012; the motor 30 comprises a main body 302 which has a circular cross section; the orthographic projection of the main body 302 on the circular surface 8012 does not exceed the area defined by the circular surface 8012. By adopting the axial flow fan 801 and the diameter of the axial flow fan 801, i.e. the diameter R1 of the circular surface 8012, is greater than the outer diameter R2 of the main body 302 of the motor 30, on the one hand, the air inlet amount can be increased, and on the other hand, the airflow can be guided to flow through the motor outer wall 303, thereby improving the heat dissipation effect.

[0313] The ratio of the diameter R1 of the axial flow fan 801 to the outer diameter R2 of the main body 802 of the motor 30 is in the range of 1-3, and preferably, the ratio is 1-1.5. In one specific example, the outer diameter R2 of the main body 802 of the motor 30 is 64 mm, and the diameter R1 of the axial flow fan 801 is 85 mm.

[0314] Referring to Fig. 11, the orthographic projection of the electronic control device 60 on the plane of the circular surface 8012 at least partially coincides with the circular surface 8012. It can be understood that this structure arrangement makes the air outlet on the outside of the axial flow fan 801 directly blow on the electronic control device 60, thereby improving the heat dissipation effect.

[0315] Referring to FIG. 9, the projection of the electronic control device 60 on the fan axis F is a first section X1, the projection of the motor 30 on the fan axis F is a second section X2, and the first section X1 and the second section X2 at least partially overlap. It can be understood that the structural arrangement is such that the electronic control device 60 and the outer side wall of the motor 30 are at least partially staggered in the direction of the fan axis F, and the air outlet of the axial flow fan 801 can flow through the motor 30 and the electronic control device 60 at the same time, thereby improving the heat dissipation efficiency.

[0316] Referring to FIGS. 5 and 6, the chain saw 100 further comprises a fairing 102 arranged at the air inlet side W1 of the axial flow fan 801, and the air inlet 802 is arranged on the fairing 102. The inner side of the fairing 102 forms a flow guide cavity 1021 which is in communication with the internal accommodating space 101 of the housing 10. The flow guide cavity 1021 is in communication with the outside through the air inlet 802. The shape of the flow guide cavity 1021 is adapted to the shape of the axial flow fan 801. The axial flow fan 801 is at least partially arranged in the flow guide cavity 1021. There is a gap between the inner side wall of the flow guide cavity 1021 and the outermost edge of the axial flow fan 801. As an example, the distance between the inner side wall of the flow guide cavity 1021 and the outermost edge of the axial flow fan 801 in the radial direction is 0.3mm-10mm. As an example, the distance between the inner side wall of the flow guide cavity 1021 and the outermost edge of the axial flow fan 801 in the radial direction is 1.5mm. It can be understood that the fairing 102 is used to guide the airflow entering from the air inlet 802 to the axial flow fan 801, and to guide the airflow to the motor 30 and the electronic control device 60.

[0317] It should be noted that compared with ordinary chain saws, chain saws used for tree operations have higher requirements for compactness and lightweight of the chain saws because the user needs to operate on the tree and the available space on the tree is small. The axial flow fan is used in the present application instead of the centrifugal fan because the layout of the airflow flow channel of the centrifugal fan will result in a large size of the chain saw, which is not conducive to the compactness and lightweight design of the chain saw. The use of the axial flow fan in the present application can reduce the size and meet the demand for small size of the chain saw used for tree operations. However, because the airflow directions of the axial flow fan and the centrifugal fan are different, there are different factors to be considered in the design of the related installation structure.

[0318] In order to test the heat dissipation effect of the chain saw of the present application, chain saws using centrifugal fans and axial flow fans as cooling fans respectively are selected for entity comparison test. Under the same comparison dimensions, i.e. under the same cutting conditions, the same initial temperature, etc., when the chain speed, i.e. the motor speed, of both is greater than or equal to 18m / s, the temperature rise difference of the inside of the housing of both is detected in the same time period. Through comparison, the temperature rise value of the chain saw using the axial flow fan provided by the present application is at least 15% lower than that of the chain saw using the centrifugal fan in the comparison, which shows that the heat dissipation performance of the technical solution of the present application is excellent.

[0319] In addition, it can be understood that, since the centrifugal fan must be matched with the volute, compared with the centrifugal fan, the axial fan is used in the application, the volute can be omitted, the material parts are saved, and the weight of the chain saw is reduced. It can also be understood that, since the outer rotor motor is smaller in size and lighter in weight than the inner rotor motor under the same performance, the size of the whole machine can be reduced, and the weight of the whole machine is reduced. In addition, the assembly can be simplified, and the mold cost and manufacturing cost can be saved. Therefore, the combination of the outer rotor motor and the axial fan is more conducive to the weight reduction of the chain saw than the combination of the outer rotor motor and the centrifugal fan and the combination of the inner rotor motor and the axial fan. At the same time, it is tested that the total cooling air volume is increased by 2 times, and the temperature rise is reduced by 20℃. That is, it is conducive to the weight reduction and the improvement of the heat dissipation performance of the chain saw.

[0320] Referring to FIG. 16, the application also provides a chain saw 100, which comprises a machine shell 10, a cutting assembly 20, a motor 30 and a battery pack 40. The cutting assembly 20 is installed on the machine shell 10, and the cutting assembly 20 comprises a guide plate 201 and a saw chain 202 arranged around the guide plate 201, and the guide plate 201 provides support and guidance for the saw chain 202. The motor 30 is installed in the machine shell 10 and is configured to drive the saw chain 100 to move around the guide plate 201 to perform cutting work. The battery pack 40 is attached to the machine shell 10 and is configured to provide power for the motor. The chain saw further comprises a main handle 501, and the cutting assembly 20 is arranged at one end of the machine shell 10 in the length extension direction L of the chain saw, and the main handle 501 is arranged at the other end of the machine shell away from the cutting assembly 20 in the length extension direction of the chain saw, that is, at the rear of the machine shell 10.

[0321] Further, the chain saw further comprises an auxiliary handle 502, and the auxiliary handle 502 is at least partially arranged on the left side of the machine shell 10 in the width extension direction of the chain saw. Exemplarily, the auxiliary handle 502 is partially arranged above the machine shell 10 and partially arranged on the left side of the machine shell 10. When in use, the user usually holds the main handle 501 with the right hand and holds the auxiliary handle 502 with the left hand to perform work. The auxiliary handle 502 cooperates with the main handle 501 to facilitate the user to operate the chain saw 100.

[0322] It should be noted that the technical features of the foregoing embodiments can be applied to the present embodiment as long as there is no contradiction or conflict, and the technical features can be combined arbitrarily. In order to make the description brief, it is not repeated here.

[0323] Preferably, for the chain saw with the main handle 501 arranged above the machine shell 10, the rated input power of the motor 30 is configured to be greater than or equal to 1200W and less than or equal to 3200W. Preferably, for the chain saw with the main handle 501 arranged at the rear of the machine shell 10, the rated input power of the motor 30 is configured to be greater than or equal to 2500W and less than or equal to 5500W.

[0324] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described, but it will be apparent to those skilled in the art that such combinations are possible and within the scope of the present disclosure, as long as such combinations do not result in contradictory or inconsistent technical effects.

[0325] In order to realize the light weight of the chain saw, the chain saw is also improved in structure to better meet the light weight requirement.

[0326] In some embodiments, referring to FIG. 6, the machine shell 10 is at least partially a single-layer wall, and a plurality of reinforcing ribs 105 are arranged on the single-layer wall. Further, the battery pack accommodating portion 104 is at least partially a single-layer wall, and a plurality of reinforcing ribs 105 are arranged on the single-layer wall. By arranging the machine shell 10 as a thin wall, the light weight of the chain saw is facilitated, and by arranging the reinforcing ribs 105 on the thin wall, the impact resistance of the machine shell 10 is improved, so that the light weight is realized as much as possible while meeting the strength requirement of the chain saw.

[0327] Further, the thickness of the single-layer wall is 1.2mm-3mm, and the size of the reinforcing rib 105 in the thickness direction of the single-layer wall is 3mm-5mm. Alternatively, the thickness of the single-layer wall is 1.4mm-2.5mm, and the size of the reinforcing rib 105 in the thickness direction of the single-layer wall is 3.5mm-5mm. As a specific example, the thickness of the single-layer wall is 1.6mm, and the size of the reinforcing rib 105 in the thickness direction of the single-layer wall is 4mm. In some embodiments, the reinforcing rib 105 is arranged perpendicular to the single-layer wall, and the reinforcing rib 105 is integrally formed with the single-layer wall. In addition, in some embodiments, the machine shell 10 is made of lightweight plastic material, which is also conducive to the light weight of the chain saw.

[0328] In some embodiments, the battery pack accommodating portion 104 includes a surrounding wall and an opening for inserting and installing the battery pack 40 surrounded by the surrounding wall, and the surrounding wall includes a bottom wall and a plurality of side walls including a front side wall, a rear side wall, and left and right side walls. At least part of the surrounding wall of the battery pack accommodating portion 104 is a hollow structure with a plurality of through holes.

[0329] Further, in some embodiments, the bottom wall of the battery pack accommodating portion 104 is a hollow structure with a plurality of through holes. In some embodiments, the left or right side wall of the battery pack accommodating portion 104 is a hollow structure with a plurality of through holes. By arranging part of the surrounding wall of the battery pack accommodating portion 104 as a hollow structure, the overall machine can be further lightened. In addition, the bottom wall is arranged as a hollow structure, which is conducive to lightening on the one hand, and the debris entering the battery pack accommodating portion 104 can be discharged through the through holes on the bottom wall, avoiding the accumulation of debris in the battery pack accommodating portion 104 to reduce the heat dissipation performance of the product, i.e. it is also conducive to heat dissipation.

[0330] In some embodiments, the auxiliary handle 502 is a hollow structure. It can be understood that the auxiliary handle 502 is provided as a hollow structure to ensure strength, which can reduce the naked weight of the chain saw and facilitate the lightweight of the chain saw.

[0331] In order to embody the technical effects of the technical solutions of the present application, taking a chain saw for work on trees as an example, two chain saws for work on trees suitable for the same cutting conditions on the market are selected, and comparison tests are carried out under the same dimensions (the same cutting conditions, the same operator, etc.). The specific comparison tests are shown in the following table.

[0332] Through comparison, the chain saw provided by the present application has less cutting time under the same cutting conditions, and the cutting efficiency is at least 15% higher than that of the comparative examples 1 and 2. The advantage is particularly obvious in the cutting of thicker square wood, i.e. under the cutting condition of greater torque, and the cutting efficiency is at least 30% higher than that of the comparative examples 1 and 2. It can be seen that the chain saw of the present application has large power, light weight, fast cutting speed and high cutting efficiency. It can be understood that high cutting efficiency can greatly improve the work efficiency of garden workers. For household use, it can save working time, and for commercial use, it can create more economic benefits. Therefore, high cutting efficiency is also an extremely important demand for garden workers.

[0333] It should be noted that the comparison test takes a chain saw for work on trees as an example, but is not limited thereto. Other chain saws using the technical solutions of the present application also have the technical effect of greatly improving the cutting efficiency, which will not be repeated here.

[0334] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0335] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

[0336] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0337] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0338] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0339] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0340] It is to be understood that the terms "including", "comprising", "incorporating", "having" or "containing" or the like are used inclusively and are not exclusionary or open ended. For example, a composition, process or method that includes (or includes the presence of) elements A, B and C can also include (or include the presence of) one or more additional elements or steps, whether or not specifically listed. A description utilizing terms such as "comprising" or "containing" to describe a combination shall also be applicable to elements or steps of for example, "consisting of" or "consisting essentially of".

Claims

1. A chain saw, comprising: a housing; a cutting assembly mounted to the housing, comprising a guide bar and a saw chain disposed around the guide bar, the guide bar providing support and guidance for the saw chain; a motor mounted in the housing, configured to drive the saw chain to move around the guide bar; and a battery pack accommodation configured to accommodate a battery pack, the battery pack configured to provide electrical energy to at least the motor; characterized in that the motor has a rated input power greater than or equal to 1200 W and less than or equal to 5500 W; a ratio of the rated input power of the motor to a bare machine weight of the chain saw is greater than or equal to 778 W / Kg, wherein the bare machine weight of the chain saw is a weight of the chain saw in a state where the guide bar, the saw chain, and the battery pack are not assembled. the housing comprises a main housing, the main housing accommodating at least the motor; 2. A chain saw as claimed in claim 1, characterized in that the chain saw further comprises a main handle disposed in a length extension direction of the chain saw; the main handle is disposed above the main housing in a height extension direction of the chain saw; a front projection edge of the main housing in a reference plane P is disposed closer to the cutting assembly in the length extension direction L of the chain saw; a front projection edge of the motor in the reference plane P is disposed closer to the cutting assembly in the length extension direction L of the chain saw, and a rear projection edge of the motor in the reference plane P is disposed away from the cutting assembly; a front projection edge of the main handle in the reference plane P is disposed between the front projection edge of the main housing and the rear projection edge of the motor in the length extension direction L of the chain saw; wherein the reference plane P is a plane perpendicular to the height extension direction H; the ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than 800 W / Kg. the rated input power of the motor is greater than or equal to 1800 W and less than or equal to 5500 W; 3. A chain saw as claimed in claim 1 or 2, characterized in that and / or, the bare machine weight of the chain saw is less than or equal to 3.5 Kg. the ratio of the rated output power of the motor to the bare machine weight of the chain saw is greater than or equal to 600 W / Kg; 4. A chain saw as claimed in claim 1 or 2, characterized in that and / or, the rated output power of the motor is greater than or equal to 1600 W. the rated output power of the battery pack is greater than 2100 W; 5. A chain saw as claimed in claim 1 or 2, characterized in that and / or, the weight of the battery pack is less than 1.8 Kg. the battery pack comprises a plurality of battery cells, the battery cells being configured as full tab battery cells.

6. A chain saw as claimed in claim 1 or 2, characterized in that the rated voltage of the battery pack is greater than 40 V and less than or equal to 100 V; 7. A chain saw as claimed in claim 1 or 2, characterized in that and / or, the rated current of the battery pack is configured to be 30-200 A. the ratio of the rated output power of the battery pack to the weight of the battery pack is greater than or equal to 1167 W / Kg; 8. A chain saw as claimed in claim 1 or 2, characterized in that and / or, the energy density of the battery pack is greater than or equal to 135 Wh / Kg.

9. The chain saw of claim 1, wherein: the rated input power of the motor is greater than or equal to 1200 W and less than or equal to 1800 W, and the bare machine weight of the chain saw is greater than or equal to 1.4 Kg and less than or equal to 2.3 Kg; and / or, the rated input power of the motor is greater than or equal to 1800 W and less than or equal to 3000 W, and the bare machine weight of the chain saw is less than or equal to 3 Kg. ​ And / or, the rated input power of the motor is greater than or equal to 2500W and less than or equal to 3500W, and the bare machine weight of the chain saw is less than or equal to 3.4Kg; And / or, the rated input power of the motor is greater than or equal to 3200W and less than or equal to 5500W, and the bare machine weight of the chain saw is less than or equal to 3.8Kg.

10. A chain saw, comprising: a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing and configured to drive the saw chain to move around the guide plate; and a battery pack mounted on the housing and configured to provide power to at least the motor; characterized in that the ratio of the rated input power of the motor to the bare machine weight of the chain saw is greater than or equal to 778W / Kg, wherein the bare machine weight of the chain saw is the weight of the chain saw in a state where the guide plate, the saw chain and the battery pack are not assembled; the battery pack comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells; the rated voltage of the battery pack is greater than 40V and less than or equal to 100V. The motor is an external rotor motor.

11. A chain saw as claimed in claim 10, characterized in that Comprising:

12. A chain saw, characterized in that a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing and configured to drive the saw chain to move around the guide plate; a battery pack mounted on the housing and configured to provide power to at least the motor; and a main handle arranged along the length extension direction of the chain saw, the main handle comprising a holding section for a user to hold; the battery pack comprises a plurality of battery cells, and the battery cells are configured as full-tab battery cells; the rated voltage of the battery pack is greater than 40V and less than or equal to 100V; the motor is configured as an external rotor motor; the holding section of the main handle is at least partially above the motor in the height extension direction of the chain saw; the rated input power of the motor is greater than or equal to 1200W and less than or equal to 3200W; Alternatively, the battery pack comprises a front side close to the cutting assembly and a rear side away from the cutting assembly in the length extension direction of the chain saw, one side of the front side of the battery pack is defined as a front side front area and the other side is defined as a front side rear area, the cutting assembly and the holding section of the main handle are both located in the front side front area, and the rear side of the battery pack is located in the front side rear area; the rated input power of the motor is greater than or equal to 600W and less than or equal to 1200W.

13. A chain saw extending along three orthogonal spatial directions of a length extension direction L, a width extension direction W and a height extension direction H, the chain saw comprising: a housing; a cutting assembly mounted on the housing, comprising a guide plate and a saw chain arranged around the guide plate, the guide plate providing support and guidance for the saw chain; a motor mounted in the housing and configured to drive the saw chain to move around the guide plate; and a battery pack receiving portion configured to receive a battery pack, the battery pack configured to provide power to at least the motor. ​ ​ The machine housing comprises a main housing, the main housing at least accommodating the motor; The chain saw further comprises a main handle, which is arranged to extend along the length extension direction L of the chain saw; The main handle is arranged above the main housing in the height extension direction H of the chain saw; The front projection edge of the main housing in the reference plane P is arranged close to the cutting assembly in the length extension direction L of the chain saw; The front projection edge of the motor in the reference plane P is arranged close to the cutting assembly in the length extension direction L of the chain saw, and the rear projection edge of the motor in the reference plane P is arranged away from the cutting assembly in the length extension direction L of the chain saw; In the length extension direction L of the chain saw, the front projection edge of the main housing and the rear projection edge of the motor are arranged on opposite sides of the main handle in the reference plane P; The reference plane P is perpendicular to the height extension direction H; The rated input power of the motor is greater than or equal to 1800W and less than or equal to 3200W; The bare machine weight of the chain saw is less than or equal to 3.5Kg, wherein the bare machine weight of the chain saw is the weight of the chain saw in a state where the chain guide, the saw chain and the battery pack are not assembled; The chain saw further comprises: an electronic control device configured to at least control the start and stop of the motor; and a temperature detection device arranged on the electronic control device and in communication connection with the electronic control device, the temperature detection device being configured to collect temperature data of the electronic control device; The electronic control device is configured to: receive the temperature data of the electronic control device sent by the temperature detection device; compare the temperature data of the electronic control device with a preset temperature threshold to determine whether a temperature protection condition is met; when the temperature protection condition is met, perform a temperature protection action; The preset temperature threshold is less than or equal to 150℃.

14. A chain saw as claimed in claim 13, characterized in that The bare machine weight of the chain saw is less than 3Kg; And / or, the ratio of the rated output power of the motor to the bare machine weight of the chain saw is greater than 800W / Kg.

15. A chain saw as defined in claim 13, characterized in that The rated input power of the motor is greater than or equal to 2100W.

16. A chain saw as defined in claim 13, characterized in that The temperature protection condition is configured such that the temperature data of the electronic control device is greater than or equal to the preset temperature threshold. And / or, the temperature protection action is configured to control the motor to stop.

17. A chain saw as defined in claim 13, characterized in that The battery pack comprises a plurality of battery cells, and the battery cells are full-tab battery cells.

18. A chain saw as claimed in claim 13 or 17, characterized in that The rated voltage of the battery pack is greater than 40V and less than or equal to 100V.

19. A chain saw as defined in claim 13, characterized in that The electronic control device is arranged in the machine housing, and the machine housing is provided with an air inlet and an air outlet in communication with the outside; The chain saw further comprises an axial flow fan arranged in the machine housing and configured to suck cooling air from the air inlet into the interior of the machine housing; The motor is connected to and drives the axial flow fan to rotate around a fan axis F; The front projection of the axial flow fan in the first plane P1 and the front projection of the electronic control device in the first plane P1 at least partially coincide or are tangent, and the first plane P1 is perpendicular to the fan axis F and parallel to the height extension direction H. And in the extension direction of the fan axis F, the axial distance L1 between the axial fan and the electronic control device is configured to be less than or equal to 50mm.

20. A chain saw as defined in claim 19, characterized in that The axial fan includes an air inlet side and an air outlet side respectively located on the two axial sides thereof; The motor and the electronic control device are both arranged on the air outlet side of the axial fan; The motor includes a motor outer wall extending in the axial direction of the power output shaft thereof; 21. A chain saw as defined in claim 19, characterized in that The electronic control device includes a heat sink arranged opposite to the motor outer wall in the length extension direction L, the heat sink extending along a heat dissipation plane, the fan axis F being substantially parallel to the heat dissipation plane; The shortest distance L2 from the fan axis F to the heat dissipation plane is configured to be 33mm-43.5mm; And / or, the orthogonal projection of the rotating surface of the axial fan on the first plane P1 is defined as a projection circle, the ratio L2:r1 of the shortest distance L2 from the fan axis F to the heat dissipation plane to the radius r1 of the projection circle is configured to be greater than 1 and less than or equal to 2.

5. The electronic control device is arranged in the casing, the casing being provided with an air inlet and an air outlet communicating with the outside; 22. A chain saw as defined in claim 13, characterized in that The chain saw further includes an axial fan arranged in the casing and configured to suck cooling air from the air inlet into the interior of the casing and discharge the cooling air from the air outlet to the outside of the casing; a cooling air flow path flowing from the axial fan to the air outlet is defined as an air outlet path; The motor is connected to and drives the axial fan to rotate around the fan axis F, the motor including a motor outer wall extending in the axial direction of the power output shaft thereof; The electronic control device is arranged on the air outlet path, the electronic control device including a heat sink arranged opposite to the motor outer wall in the length extension direction L, the heat sink extending along a heat dissipation plane, the heat dissipation plane being arranged obliquely or perpendicularly relative to the reference plane P; The orthogonal projection of the rotating surface of the axial fan on the first plane P1 is a projection circle, the projection circle including an upper half circle and a lower half circle in the height extension direction H, the orthogonal projection of the heat sink on the first plane P1 including an uppermost end point and a lowermost end point in the height extension direction H, tangent lines being drawn through the uppermost end point and the lowermost end point to the lower half circle of the projection circle, respectively, an included angle ∑ opposite to the heat sink between the two tangent lines being configured to be greater than or equal to 15°, the first plane P1 being a plane perpendicular to the fan axis F and parallel to the height extension direction H. The heat sink surface is convexly arranged in the direction of the motor and is provided with a plurality of heat dissipation ribs arranged at intervals; 23. A chain saw as claimed in claim 22, characterized in that The heat dissipation ribs are configured to extend in a direction at an angle of 10°-170° relative to the first plane, or to be arranged perpendicularly relative to the fan axis F, so that debris slides down along the heat dissipation ribs. ​ 24. A chain saw as defined in claim 13, characterized by The electronic control device is arranged in the casing, and the casing is provided with an air inlet and an air outlet which are communicated with the outside; The chain saw further comprises an axial flow fan arranged in the casing and configured to suck cooling air from the air inlet into the interior of the casing, the axial flow fan comprising an air inlet side and an air outlet side respectively located at two axial sides of the axial flow fan; The motor and the electronic control device are both arranged at the air outlet side of the axial flow fan; The motor is connected to and drives the axial flow fan to rotate about a fan axis F, the motor comprising a motor outer wall extending in an axial direction of a power output shaft of the motor; the electronic control device comprises a heat dissipation plate arranged opposite to the motor outer wall in the length extension direction L; an airflow passage is formed between the heat dissipation plate and the motor outer wall; The axial flow fan is configured to cause the cooling air to flow from the air inlet side to the air outlet side of the axial flow fan and to flow through the airflow passage, the cooling air flowing through the motor outer wall while also flowing through at least part of the heat dissipation plate.

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