Lubricating system of handheld electric gardening tool and handheld electric chain saw applying lubricating system

Abstract

The utility model discloses a lubrication system of a handheld electric gardening tool and a handheld electric chain saw applying the lubrication system, and relates to the technical field of electric gardening tools, the lubrication system comprises a shell, a holding handle is arranged at the near end of the shell, and a gardening working head is arranged at the far end of the shell; a power mechanism used for driving the working head is installed on the shell and comprises a motor and a power transmission assembly used for transmitting output power of the motor to the garden working head so as to drive the garden working head. A motor front end and a motor rear end are formed in the axial direction of the motor, the motor front end is arranged on the shell, and the motor rear end faces the far end away from the shell and faces the position close to the holding handle. An oil supply tank and an oil supply assembly are arranged on the shell, the oil supply assembly is used for guiding oil in the oil supply tank to the garden working head, and the oil supply tank is installed on the shell and located behind the rear end of the motor in the axial direction of the motor, so that the problem that the gravity center inclines forwards seriously due to unreasonable configuration of the oil supply tank is solved, and a user can use the garden working head more comfortably.

Description

Technical Field

[0001] This utility model relates to the field of electric garden tool technology, and in particular to a lubrication system for handheld electric garden tools and a handheld electric chainsaw using the same. Background Technology

[0002] Handheld electric chainsaws are primarily controlled by a control system that powers a motor, which in turn drives the saw chain on the guide plate to rotate cyclically for sawing. Their structure is similar to that described in Chinese invention application CN117245612A, titled "Cutting Tool." The cutting tool is a chainsaw, which includes a main body, handle, guide bar, saw chain, electric motor, power transmission mechanism, and battery pack. The guide bar is a long, thin, plate-like component that protrudes forward from the main body and is mounted on the outer casing. The saw chain is mounted along the periphery of the guide bar; the guide bar is what industry professionals refer to as the saw chain guide plate. The chainsaw uses electricity supplied from the battery pack to power the electric motor, which in turn drives the saw chain along the periphery of the guide bar via the power transmission mechanism.

[0003] To lubricate the saw chain, industry professionals have proposed numerous lubrication designs. For example, the oil tank and oil pump integrated into the main body of the casing, as proposed in Chinese invention application CN117245612A, utilize a worm gear in the power transmission mechanism that meshes with the pump's turbine. When driven by an electric motor, the rotational motion of the motor shaft is transmitted to the oil pump via the reducer, drive shaft, worm gear, and worm wheel of the power transmission mechanism, thus driving the pump. When the pump is activated, lubricating oil is drawn into the oil supply circuit through a suction section located inside the oil tank, and then supplied from the oil supply circuit via a spray section, guide rod, and saw chain.

[0004] Although the invention application CN117245612A proposes to adjust the position and orientation of components such as electric motors, guide rods, and handles so that the center of gravity of the entire chain saw is off-center from the rear of the housing, i.e., biased towards the handle and away from the guide rod, the oil tank is located near the front of the main body of the housing. In other words, the center of gravity of the entire chain saw will be affected by the weight of the oil tank and the lubricating oil contained in the oil tank and will shift forward. Moreover, the more lubricating oil is contained in the oil tank, the more serious the forward tilt of the center of gravity will be, resulting in poor user comfort.

[0005] Furthermore, since the oil pump is installed inside the main body of the housing, when the oil pump needs maintenance or adjustment, the main body of the housing needs to be removed, which is inconvenient for maintenance and adjustment.

[0006] Therefore, there is a need to provide a lubrication system for handheld electric garden tools and a handheld electric chainsaw using the same, in order to at least partially solve the above problems. Utility Model Content

[0007] To overcome the shortcomings mentioned above, this utility model aims to provide a lubrication system for handheld electric garden tools that solves the problem of severe forward tilting of the center of gravity caused by unreasonable oil tank configuration, a lubrication system for handheld electric garden tools that solves the problem of inconvenient maintenance and adjustment of the oil pump, and a handheld electric chainsaw that solves the problems of severe forward tilting of the center of gravity caused by unreasonable oil tank configuration and inconvenient maintenance and adjustment of the oil pump.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a lubrication system for a handheld electric garden tool, comprising a housing, a handle at the proximal end of the housing, and a garden working head at the distal end of the housing; a power mechanism for driving the working head is mounted on the housing, the power mechanism including a motor and a power transmission component for transmitting the output power of the motor to the garden working head to drive the garden working head; a front end and a rear end of the motor are formed along the axial direction of the motor, the front end of the motor is located on the housing, and the rear end of the motor faces away from the housing and towards the handle; an oil supply tank and an oil supply component are provided on the housing, the oil supply component is used to guide the oil in the oil supply tank to the garden working head, the oil supply tank is mounted on the housing and located behind the rear end of the motor along the axial direction of the motor.

[0009] As a further embodiment of this utility model: the working head is a saw chain type working head, which includes a saw chain guide plate installed at the far end of the housing and a saw chain set on the saw chain guide plate. The saw chain guide plate is installed on the housing and extends in a direction away from the near end of the housing; the axial direction of the motor is parallel to the plane b on which the surface of the saw chain guide plate is located; the gripping length direction of the grip handle is parallel to the plane b on which the surface of the saw chain guide plate is located.

[0010] As a further embodiment of this utility model: the oil supply tank has an oil tank length direction that is the same as the axial direction of the motor; an oil tank opening is provided on the side of the oil supply tank away from the motor, and an oil tank cover is provided on the oil tank opening that is connected to the oil supply tank along the oil tank length direction.

[0011] As a further embodiment of this utility model: with plane b as the main viewing plane: the angle C formed by the length direction of the handle and the axis of the motor is 63°-83°, and the angle D formed by the length direction of the handle and the length direction of the saw chain guide is 15.5°-35.5°.

[0012] As a further aspect of this utility model: the rotating shaft of the motor inputs power towards the front end of the motor to drive the saw chain; the power transmission assembly includes a saw chain wheel for cooperating with the saw chain, the saw chain wheel is connected to a rotating shaft, and the rotating shaft is rotatably connected to the housing; the axis of the rotating shaft is perpendicular to the plane b where the surface of the saw chain guide plate is located; the power transmission assembly also includes a gear set for powerly connecting the rotating shaft of the motor to the rotating shaft; the gear set includes a first bevel gear connected to the rotating shaft of the motor and a second bevel gear connected to the rotating shaft, wherein the first bevel gear and the second bevel gear mesh.

[0013] As a further embodiment of this utility model: with plane b as the main viewing plane: the vertical distance L1 from the axis of the rotating shaft to the extension line of the center line of the grip handle in the length direction is 33.57mm-53.57mm; and in the axial direction of the motor, the axis of the rotating shaft is located in front of the grip handle.

[0014] As a further embodiment of this utility model: a switch trigger is provided at the front end of the grip handle; with plane b as the main viewing plane, in the length direction of the grip handle: the axis of the rotating shaft is located in front of the center of the switch trigger, and the vertical distance L3 between the center of the switch trigger and the axis of the rotating shaft is 55.29mm-75.29mm.

[0015] As a further embodiment of this utility model: a safety lock is provided at the front end of the grip handle, and the front end of the grip handle forms a concave arc-shaped part that is smoothly connected to the part on the housing used for loading the fuel tank; on the motor in the radial direction parallel to plane b: the safety lock is located between the arc center of the concave arc-shaped part and the motor, and the vertical distance L6 between the arc center of the concave arc-shaped part and the safety lock is 14.25mm-24.25mm.

[0016] As a further embodiment of this utility model: the rotating shaft of the motor is directed towards the front end of the motor to input power for driving the garden work head, the rotating shaft of the motor extends to the rear end of the motor and is connected to a cooling fan wheel, there is a heat dissipation gap between the oil supply tank and the rear end of the motor that matches the cooling fan wheel, and the housing has a heat dissipation port corresponding to the heat dissipation gap.

[0017] As a further embodiment of this utility model: the cooling fan wheel includes a central part connected to the rotating shaft of the motor and a radial air guide plate connected to the central part, wherein the radial air guide plate is disposed between the motor and the oil supply tank; the cooling fan wheel also includes multiple fan blades surrounding the central part, the fan blades being located on the side of the radial air guide plate away from the oil supply tank; the heat dissipation port is arranged radially on the housing relative to the rotating shaft of the motor.

[0018] This utility model also provides the following technical solution: a lubrication system for a handheld electric garden tool, characterized in that it includes a housing, on which a handle, a garden working head, and a power mechanism are provided; the power mechanism includes a motor and a power transmission component that transmits the output power of the motor to the garden working head to drive the garden working head; the housing is provided with an oil supply tank and an oil supply component, the oil supply component including an oil supply pump, the oil supply pump having an oil inlet corresponding to the oil supply tank and an oil outlet corresponding to the working head, the pump shaft of the oil supply pump being shaft-connected to an oil pump drive gear, the oil pump drive gear being adapted to mesh with a rotatable gear on the power transmission component to be driven by the gear of the power transmission component; an installation cavity for accommodating electrical components is formed inside the housing, and the oil supply pump is detachably connected to the outside of the housing.

[0019] As a further embodiment of this utility model: the working head is a saw chain type working head, which includes a saw chain guide plate mounted on the housing and a saw chain set on the saw chain guide plate; the axial direction of the oil pump shaft is parallel to the plane b on which the plate surface of the saw chain guide plate is located.

[0020] As a further embodiment of this utility model, an additional protective cover for covering the oil supply pump is detachably connected to the outer side of the housing.

[0021] As a further embodiment of this utility model: the oil supply pump body is connected to a first fixing part and a second fixing part; a first vertical connecting assembly is provided between the oil supply pump and the housing, the first vertical connecting assembly is used to join the first fixing part to the housing in a direction perpendicular to plane b; a second vertical connecting assembly is provided between the additional protective cover and the housing, the second vertical connecting assembly is used to join the additional protective cover to the housing in a direction perpendicular to plane b, and the additional protective cover presses the second fixing part against the housing in a direction perpendicular to plane b.

[0022] This utility model also provides the following technical solution: a handheld electric chainsaw, which uses the above-mentioned lubrication system, wherein the working head is a saw chain type working head.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a three-dimensional structural view of the present invention;

[0026] Figure 2 This is another three-dimensional view of the present invention, in which the additional protective cover is in the removed state and the protective cover is in the removed state;

[0027] Figure 3 This is a side view of the structure of this utility model, in which the additional protective cover and shield are hidden;

[0028] Figure 4 yes Figure 3 Enlarged schematic diagram of a local structure at point A;

[0029] Figure 5 This is a side view of the internal structure of this utility model;

[0030] Figure 6 This is another side view of the internal structure of this utility model;

[0031] Figure 7 This is another side view of the internal structure of this utility model, which is in Figure 6 The corresponding angles and distances are marked on the structure.

[0032] The corresponding labels in the attached diagram are explained as follows:

[0033] Housing-1, mounting cavity-101,

[0034] Hold the handle-2,

[0035] Garden work head-3, saw chain guide plate-301, saw chain-302.

[0036] Motor-4,

[0037] Power transmission assembly - 5, worm gear - 501, first bevel gear - 502, second bevel gear - 503, shaft - 504

[0038] Fuel supply tank-6, fuel tank inlet-601, fuel tank cap-602, positioning platform-603.

[0039] Oil supply assembly - 7, oil supply pump - 701, pump shaft - 702, pump drive gear - 703, first fixing part - 704, second fixing part - 705, first connecting screw - 706, positioning pin - 707, internal threaded hole - 708, first positioning part - 709.

[0040] Cooling fan wheel-8, center section-801, radial air guide plate-802, fan blades-803.

[0041] Heat dissipation gap -9,

[0042] Vent -10,

[0043] Additional protective cover-11,

[0044] Protective partition-12,

[0045] Battery-13

[0046] Shield-14,

[0047] Block 15,

[0048] Safety lock 16,

[0049] Switch trigger 17,

[0050] Concave arc-shaped part 18. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] Please see Figure 1-7 In this embodiment of the utility model, the handheld electric garden tool is, for example, a handheld electric chainsaw that can be used to cut tree branches.

[0053] The handheld electric garden tool includes a housing 1, a handle 2 at the proximal end of the housing 1, and a mounting frame at the distal end of the housing 1. A saw chain guide 301 is mounted on the mounting frame, and a saw chain 302 is mounted on the saw chain guide 301. The saw chain guide 301 is mounted on the mounting frame and extends in a direction away from the proximal end of the housing 1.

[0054] A power mechanism for driving the saw chain 302 is installed on the housing 1. The power mechanism includes a motor 4 and a power transmission assembly 5 that transmits the output power of the motor 4 to the saw chain 302 to drive the saw chain 302. A front end and a rear end of the motor 4 are formed in the axial direction. The front end of the motor is located on the housing 1, and the rear end of the motor is oriented to the far end away from the housing and towards or as close as possible to the handle 2.

[0055] The grip handle 2 has a certain grip length to accommodate users with different hand sizes as much as possible. The grip length is the distance from the position where the grip handle 2 is connected to the near end of the housing to the position along the handle of the grip handle 2 away from the near end of the housing.

[0056] The axial direction of motor 4 (which can be understood as the axial direction of the motor's rotation shaft) is parallel to the plane b on which the saw chain guide plate 301 is located, and the grip length direction of the handle 2 is parallel to the plane b on which the saw chain guide plate 301 is located, effectively reducing the side width of the handheld electric garden tool.

[0057] In this embodiment of the invention, the housing 1 has a lubrication system for lubricating the saw chain 302.

[0058] The lubrication system includes an oil supply tank 6 and an oil supply assembly 7, which is used to guide the lubricating oil in the oil supply tank 6 to the saw chain 302.

[0059] In this embodiment of the utility model, the oil supply tank 6 is installed on the housing 1 and located behind the rear end of the motor along the axial direction of the motor 4, so that the overall center of gravity is more biased towards the rear of the motor. That is, relative to the saw chain guide plate 301 and the handle 2, the center of gravity of the chainsaw is closer to the handle.

[0060] The rotating shaft of motor 4 is directed towards the front end of the motor to input power to drive the saw chain 302. The rotating shaft of motor 4 extends towards the rear end of the motor and is connected to a cooling fan wheel 8. There is a heat dissipation gap 9 between the oil supply tank 6 and the rear end of the motor, which is matched with the cooling fan wheel 8.

[0061] When the heat dissipation gap 9 is formed inside the housing 1, the housing 1 has a corresponding heat dissipation port 10. On the one hand, through the heat dissipation fan wheel 8 and the heat dissipation gap 9, the motor 4 can drive the heat dissipation fan wheel 8 to dissipate heat from the motor 4 when it is working, which better ensures the safety and service life of the electrical components. On the other hand, the heat dissipation gap 9 clearly separates the oil supply tank 6 and the rear end of the motor, forming the first stage of air insulation, so that the heat generated by the motor 4 when it is working has little impact on the lubricating oil in the oil supply tank 6.

[0062] Preferably, a protective partition 12 is formed on the housing 1 to separate the oil supply tank 6 from the motor 4, forming a second stage of heat insulation and blocking, so that the heat of the motor 4 can be better blocked in the heat dissipation gap 9, so that the heat of the motor 4 has less impact on the lubricating oil in the oil supply tank 6.

[0063] The cooling fan wheel 8 includes a central part 801 connected to the rotating shaft of the motor 4, and a radial air guide plate 802 connected to the central part 801, wherein the radial air guide plate 802 is positioned between the motor 4 and the oil supply tank 6; the cooling fan wheel 8 also includes multiple fan blades 803 surrounding the central part 801, and the multiple fan blades 803 are located on the side of the radial air guide plate 802 away from the oil supply tank 6.

[0064] The radial air guide plate 802 guides the air radially relative to the axial direction of the motor 4: the air driven by the fan blade 803 enters the center part 801 from the side direction (radial direction of the motor's rotation axis) and then flows to the motor 4 along the axial direction; or, the air driven by the fan blade 803 flows from the motor 4 to the center part 801 along the axial direction of the motor 4 and then flows out from the side direction of the center part 801.

[0065] The heat dissipation vent 10 is positioned on the side of the housing 1 relative to the center 801. The design of the heat dissipation fan wheel 8 and the heat dissipation vent 10 enables a relatively smooth airflow channel for heat dissipation, thereby reducing the impact of the oil supply tank 6 position on the fan's heat dissipation.

[0066] The radial wind guide plate 802 also forms a primary heat insulation setting to reduce the heat radiation from the motor 4 to the protective partition 12 or the oil supply tank 6.

[0067] The oil supply tank 6 has the same length direction as the motor 4. Preferably, the center line of the oil supply tank 6 in the length direction coincides with the extension line of the axis of rotation of the motor 4.

[0068] The side of the fuel tank 6 has a protruding positioning platform 603, which is configured to display the amount of fuel inside the fuel tank 6. For example, the positioning platform 603 is made of a transparent or relatively transparent material.

[0069] The housing 1 can be formed by connecting two halves of the housing. A notch corresponding to the positioning platform 603 is formed between the two halves of the housing. When the two halves of the housing are brought close together and connected, the positioning platform 603 is positioned at the same time. On the one hand, the positioning platform 603 makes the connection of the oil supply tank 6 on the housing 1 more stable. On the other hand, the positioning platform 603 makes it easier to check the oil level inside the oil supply tank 6.

[0070] Preferably, an oil level indicator line can be set on the positioning platform 603 so that the user can quickly determine the oil level ratio in the oil supply tank.

[0071] An oil tank opening 601 is provided on the side of the oil supply tank 6 away from the motor 4, and an oil tank cover 602 is provided on the oil tank opening 601 and is connected to the oil supply tank 6 along the axial direction of the motor 4.

[0072] Furthermore, the fuel tank cap 602 is columnar, with external threads formed on the outer side of the fuel tank cap 602 and corresponding internal threads formed on the inner side of the fuel tank opening 601. The axial screw connection design can reduce the occupation of lateral space.

[0073] The housing 1 is provided with a protective cover 14 for protecting the motor 4 and the oil supply tank 6. The protective cover 14 is joined to the housing 1 along the axial direction of the motor 4 and from the oil supply tank 6 to the motor 4. The protective cover 14 has a window corresponding to the positioning platform 603, an operating port corresponding to the oil tank cover 602, and a protective mesh corresponding to the heat dissipation vent 10.

[0074] The outer side of the housing 1 has a guide rail, and the inner side of the cover 14 has a corresponding guide bar or guide block, so that the cover 14 can be smoothly slid onto the housing 1.

[0075] To prevent the cover 14 from easily detaching from the housing 1, a detachable connection structure is provided between the cover 14 and the housing 1, for example, by connecting the cover to the housing with screws.

[0076] In this embodiment of the present invention, the power transmission component 5 includes a saw chain wheel for cooperating with the saw chain 302. The saw chain wheel is connected to a rotating shaft 504, which is rotatably connected to the housing 1 or the mounting bracket.

[0077] The axis of the rotating shaft 504 is perpendicular to the plane b on which the saw chain guide plate 301 is located. That is, the axis of the rotating shaft 504 is perpendicular to the axis of the motor 4. It can also be understood that the rotation axis of the motor 4 is perpendicular to the rotating shaft 504.

[0078] The power transmission assembly 5 also includes a gear set that connects the rotating shaft of the motor 4 to the rotating shaft 504. The gear set includes a first bevel gear 502 connected to the rotating shaft of the motor 4 and a second bevel gear 503 connected to the rotating shaft 504. The first bevel gear 502 and the second bevel gear 503 mesh to connect the rotating shaft of the motor 4 and the rotating shaft 504, which are perpendicular to each other. When the motor 4 is working and the rotating shaft is rotating, the saw chain wheel can be driven to rotate through the first bevel gear 502, the second bevel gear 503 and the rotating shaft 504, thereby driving the saw chain 302 to perform a "sawing" action.

[0079] In this embodiment of the present invention, the oil supply assembly 7 includes an oil pipe and an oil supply pump 701. An oil pumping drive gear 703 is connected to the oil pumping shaft 702 of the oil supply pump 701. The oil pumping drive gear 703 on the oil pumping shaft 702 is adapted to mesh with a rotatable gear on the power transmission assembly 5 so as to be driven by the gear of the power transmission assembly 5.

[0080] Preferably, the power transmission assembly 5 further includes a worm gear 501 connected to the rotating shaft 504. The oil pump drives the gear 703 to mesh with the worm gear 501. At this time, the axis of the oil pump shaft 702 is parallel or substantially parallel to the plane b where the surface of the saw chain guide plate 301 is located. Figure 3 , 4As shown, the length direction of the oil supply pump body is the same as or substantially the same as the length direction of the oil pump shaft 702. The oil pump shaft 702 is inserted into the oil supply pump body to drive the oil pumping components inside the oil supply pump body, thereby pumping oil.

[0081] In this embodiment of the present invention, a receiving cavity 101 for accommodating electrical components is formed inside the housing 1. The electrical components are, for example, a motor, a control motherboard, etc., and the oil pump 701 is detachably connected to the outside of the housing 1.

[0082] The oil inlet on the main body of the oil pump is connected to the oil tank 6 via an oil pipe, and the oil outlet on the main body of the oil pump is connected to another oil pipe, which extends the lubricating oil to be released onto the saw chain guide or the saw chain. When the lubricating oil is extended to be released onto the saw chain guide, it can be transferred to the saw chain through the contact between the saw chain guide and the saw chain.

[0083] On the one hand, the housing 1 provides thermal insulation between the electrical components inside the cavity 101 and the oil supply pump 701, making it less likely that the heat generated by the electrical components inside the cavity 101 will affect the oil supply pump 701. Furthermore, the oil supply pump 701, which is installed outside the housing 1, can come into contact with the cooler air outside the housing 1 (relative to the inside of the housing), which is more conducive to ensuring the service life of the oil supply pump 701. On the other hand, since the oil supply pump 701 is installed outside the housing 1, it is more convenient to maintain and adjust it when the oil supply pump 701 of the lubrication system fails.

[0084] An additional protective cover 11 is detachably connected to the outside of the housing 1 to protect the oil supply pump 701. The additional protective cover 11 can be used to provide additional protection for the oil supply pump 701 located outside the housing 1. After the additional protective cover 11 is connected and closed onto the housing 1, in addition to providing additional protection for the oil supply pump 701, the additional protective cover 11 can also protect the adjacent oil pipes, as well as the worm gear 501 and the oil pump drive gear 703.

[0085] The main body of the oil pump has a first fixed side wing, indicated as a first fixed part 704, and a second fixed side wing, indicated as a second fixed part 705.

[0086] A first fixing hole is passed through the first fixed side wing, and a positioning hole is passed through the second fixed side wing. Both the first fixing hole and the positioning hole pass through the corresponding fixed side wing in a direction perpendicular to plane b.

[0087] The outer side of the housing 1 is formed with a screw post corresponding to the first fixing hole. A first connecting screw 706 is disposed on the screw post. The screw of the first connecting screw 706 passes through the first fixing hole and is screwed onto the screw post. When the first connecting screw 706 is screwed onto the screw post and is continuously screwed in, the nut of the first connecting screw 706 presses the first fixing side against the end face of the screw post along the axial direction of the screw post.

[0088] The first connecting screw 706 is used to fasten the first fixing wing, which has the first fixing hole, to the threaded post, and to engage the first fixing wing to the housing 1 in a direction perpendicular to plane b. The axial direction of the threaded post is also perpendicular to plane b.

[0089] The housing 1 has an abutment portion formed thereon, and a positioning post 707 that mates with a positioning hole is formed on the abutment portion. An internal threaded hole 708 is formed on the end of the positioning post 707 away from the abutment portion. The additional protective cover 11 has a second connecting post corresponding to the second fixed side wing formed thereon, and a second fixing hole corresponding to the positioning post 707 is formed through the second connecting post.

[0090] A second connecting screw (not shown) is screwed onto the internal threaded hole 708. After the positioning hole is fitted onto the positioning post 707: the screw of the second connecting screw passes through the second fixing hole from the outside of the additional protective cover 11 and is screwed onto the internal threaded hole. As the second connecting screw is screwed into the internal threaded hole and continuously screwed in, the nut of the second connecting screw drives the second connecting post to press the second fixing wing against the abutment part along the axial direction of the positioning post 707. That is, the second connecting screw is configured such that when the additional protective cover 11 is engaged to the housing 1 in a direction perpendicular to plane b, the second fixing wing is simultaneously engaged to the housing 1 in a direction perpendicular to plane b. The axial direction of the positioning post is also perpendicular to plane b.

[0091] A first positioning part 709 is formed on the side of the oil pump body corresponding to the additional protective cover 11. A first positioning groove corresponding to the first positioning part 709 is recessed on the additional protective cover 11. After the additional protective cover 11 is connected to the housing 1, the first positioning part 709 is positioned and engaged in the first positioning groove. A second positioning part is formed on the side of the oil pump body away from the first positioning part. A second positioning groove corresponding to the second positioning part is formed on the housing. When the oil pump is connected to the outside of the housing, the second positioning part is positioned and engaged in the second positioning groove. With the above connection method, when the oil pump 701 and the additional protective cover 11 are securely connected, the lateral space occupied by the chainsaw is minimized.

[0092] When removing and installing the fuel pump 701, the connection between the additional protective cover 11 and the fuel pump body allows for a faster process from removing the additional protective cover 11 to completely removing the fuel pump 701. Furthermore, when connecting the fuel pump 701, the positioning action of the positioning post 707 and the positioning hole makes it easier for the first connecting screw 706 to be aligned and screwed onto the screw hole post.

[0093] The design, through the aforementioned connection method, allows the oil pump 701 to be subjected to two different engagement forces: one is the direct clamping force exerted by the connecting fastener (first connecting screw) on the oil pump 701 (the first fixed side wing formed thereon); the other is the indirect clamping force exerted by the connecting fastener (second connecting screw) on the oil pump 701 (the second fixed side wing formed thereon) through an intermediate component (an additional protective cover with a second connecting post). In saw chains that generate frequent and large-amplitude vibrations during such operations, this connection structure can effectively prevent the oil pump 701 from loosening, resulting in better connection stability.

[0094] like Figure 3 , 4 As shown, after the oil supply pump 701 is securely connected, the axial arrangement of the positioning pin 707 and the first connecting screw 706 effectively eliminates the influence of the force applied by the worm gear 501 to the oil pump drive gear 703 on the connection stability of the oil supply pump 701 when the worm gear 501 drives the oil pump drive gear 703.

[0095] In this embodiment of the utility model, when the chainsaw is powered by a storage battery 13, the storage battery 13 can be connected to the handle 2, and a gas flow channel corresponding to the motor 4 is provided inside the handle 2, and a corresponding heat dissipation hole is opened on the handle 2. A heat dissipation channel is formed by the heat dissipation hole, the gas flow channel, the outside and / or inside of the motor, the heat dissipation gap, and the heat dissipation port, so that the heat dissipation fan wheel 8 can also act on the heat dissipation of the storage battery 13, and the storage battery 13 can also make the overall weight more rearward and closer to the handle 2.

[0096] Preferably, some electrical components can be placed on the heat dissipation channel, so that other electrical components can be cooled by forced fan at the same time.

[0097] For details of this utility model embodiment, please refer to [link / reference]. Figure 2 , 6 7. A1 is the center line and its extension along the length of the handle, and the length direction of A1 is the length direction of the handle. A2 is the center line and its extension along the length of the saw chain guide, and the length direction of A2 is the length direction of the saw chain guide. A3 is the axis of the motor's rotating shaft and its extension, and the length direction of A3 is the axial direction of the motor.

[0098] With plane b as the main viewing plane: the angle C formed by the length direction of the handle and the axis of the motor is 73°, the angle D formed by the length direction of the handle and the length direction of the saw chain guide is 25.5°, and the angle E formed by the length direction of the saw chain guide and the axis of the motor is 47.5°.

[0099] With plane b as the main viewing plane: the vertical distance L1 from the axis of the rotating shaft to the extension of the center line of the handle along its length is 43.57 mm; and in the axial direction of the motor, the axis of the rotating shaft is located in front of the handle.

[0100] A switch trigger 17 is provided at the front end of the grip handle. With plane b as the main viewing plane, in the length direction of the grip handle: the axis of rotation is located in front of the center of the switch trigger, and the vertical distance L3 between the center of the switch trigger and the axis of rotation is 65.29 mm.

[0101] A safety lock 16 is provided at the front end of the handle, and a concave arc-shaped portion 18 is formed at the front end of the handle, which smoothly connects to the part on the housing used to load the fuel tank. R1 is the circle corresponding to the center of the arc of the concave arc-shaped portion 18, and the radius of the circle is 16.76 mm. In the radial direction parallel to plane b on the motor: the safety lock is located between the center of the arc of the concave arc-shaped portion and the motor; the vertical distance L6 between the center of the arc of the concave arc-shaped portion and the safety lock is 19.25 mm; the vertical distance L4 between the center of the switch trigger and the same point of the aforementioned safety lock is 14 mm; and the vertical distance L5 between the same point of the aforementioned safety lock and the axis of rotation of the motor is 44.03 mm.

[0102] The housing has a stop 15 near the front end of the grip handle. The vertical distance L2 from the stop to the extension line of the center line of the saw chain guide plate in the length direction is 42.49mm-62.49mm, preferably 52.49mm.

[0103] The overall structure and relative dimensions are reasonably designed, conforming to ergonomics, and the overall center is more suitable for users to hold.

[0104] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lubrication system for a hand-held electric garden tool, characterized in that It includes a housing, with a handle at the proximal end and a gardening work head at the distal end; The housing is equipped with a power mechanism for driving the working head. The power mechanism includes a motor and a power transmission component that transmits the output power of the motor to the garden working head to drive the garden working head. The motor has a front end and a rear end in the axial direction. The front end is set on the housing, and the rear end is facing away from the housing and towards the handle. The housing is equipped with an oil supply tank and an oil supply assembly. The oil supply assembly is used to guide the oil in the oil supply tank to the garden work head. The oil supply tank is installed on the housing and is located behind the rear end of the motor along the axial direction of the motor. The motor's rotating shaft is directed towards the front end of the motor to input power for driving the garden work head. The motor's rotating shaft extends towards the rear end of the motor and is connected to a cooling fan wheel. There is a heat dissipation gap between the oil supply tank and the rear end of the motor that matches the cooling fan wheel. The housing has a heat dissipation port corresponding to this heat dissipation gap.

2. The lubrication system of claim 1, wherein, The working head is a saw chain type working head, which includes a saw chain guide plate installed at the far end of the housing and a saw chain set on the saw chain guide plate. The saw chain guide plate is installed on the housing and extends in a direction away from the near end of the housing. The motor's axial direction is parallel to plane b, which is located on the surface of the saw chain guide plate. The grip length direction of the handle is parallel to plane b, where the surface of the saw chain guide plate is located.

3. The lubrication system of claim 2, wherein, The oil supply tank has the same length direction as the motor axis; An oil tank opening is provided on the side of the oil supply tank away from the motor, and an oil tank cover is provided on the oil tank opening, which is connected to the oil supply tank along the length of the oil tank.

4. The lubrication system of claim 2 or 3, wherein, With plane b as the main viewing plane: the angle C formed by the length direction of the handle and the axis of the motor is 63°-83°, and the angle D formed by the length direction of the handle and the length direction of the saw chain guide is 15.5°-35.5°.

5. The lubrication system of claim 4, wherein, The power transmission assembly includes a saw chain wheel for cooperating with the saw chain. The saw chain wheel is connected to a rotating shaft, which is rotatably connected to the housing. The axis of the rotating shaft is perpendicular to plane b, where the surface of the saw chain guide plate is located. The power transmission assembly also includes a gear set that power-connects the rotating shaft of the motor to the rotating shaft; the gear set includes a first bevel gear connected to the rotating shaft of the motor and a second bevel gear connected to the rotating shaft, wherein the first bevel gear meshes with the second bevel gear.

6. The lubrication system of claim 5, wherein, With plane b as the main viewing plane: the vertical distance L1 from the axis of the rotating shaft to the extension of the center line of the handle along its length is 33.57mm-53.57mm; and in the axial direction of the motor, the axis of the rotating shaft is located in front of the handle.

7. The lubrication system of claim 6, wherein, A switch trigger is located at the front end of the grip handle; With plane b as the main viewing plane, along the length of the grip handle: the axis of the rotating shaft is located in front of the center of the switch trigger, and the vertical distance L3 between the center of the switch trigger and the axis of the rotating shaft is 55.29mm-75.29mm.

8. The lubrication system according to claim 2, 3, 5, 6, or 7, characterized in that, A safety lock is provided at the front end of the grip handle, and the front end of the grip handle has a concave arc-shaped part that smoothly connects with the part on the housing used to load the fuel tank. On the radial direction parallel to plane b on the motor: the safety lock is located between the center of the concave arc and the motor, and the vertical distance L6 between the center of the concave arc and the safety lock is 14.25mm-24.25mm.

9. The lubrication system according to claim 1, 2, 3, 5, 6, or 7, characterized in that, The cooling fan wheel includes a central part connected to the rotating shaft of the motor and a radial air guide plate connected to the central part, wherein the radial air guide plate is disposed between the motor and the oil supply tank; The cooling fan wheel also includes multiple fan blades surrounding the center, with the fan blades located on the side of the radial air guide plate away from the oil supply tank; The heat dissipation vents are arranged on the housing in a radial direction relative to the rotation axis of the motor.

10. A hand-held electric chain saw, characterized in that The lubrication system according to claim 1 is used, wherein the working head is a saw chain type working head; The oil supply assembly includes an oil supply pump, which has an oil inlet corresponding to the oil supply tank and an oil outlet corresponding to the working head. The pump shaft of the oil supply pump is connected to an oil pump drive gear, which is adapted to mesh with a rotatable gear on the power transmission assembly so as to be driven by the gear of the power transmission assembly. An installation cavity for accommodating electrical components is formed inside the housing, and the oil supply pump is detachably connected to the outside of the housing.

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