Power tool

Abstract

The application provides a power tool, comprising: a motor; a tool housing comprising a motor housing accommodating the motor and a holding housing; a fan driven to rotate by the motor to generate a cooling air flow, the tool housing being provided with an air flow channel; the air flow channel comprising a first air flow channel and a second air flow channel which are relatively independent; a battery pack for powering the motor, comprising a shell and a battery cell accommodated in the shell, the shell comprising an air inlet and an air outlet, the air inlet and the air outlet being communicated to form a battery pack air flow channel, the battery pack air flow channel being communicated with the first air flow channel when the battery pack is combined to the tool housing; and a controller for controlling the motor, at least part of the controller being arranged in the second air flow channel. The power tool shown in the application cools the battery pack and the controller through two independent air flow channels respectively, improves the cooling efficiency, and meets the requirements of cutting operation.

Description

Technical Field

[0001] This invention relates to a power tool, and more particularly to a power tool powered by a battery pack. Background Technology

[0002] Power tools are widely used in manual labor. Circular saws, a typical DC-powered tool, are powered by a battery pack and require high heat dissipation. The motor drives the saw blade through a transmission mechanism, and an internal controller manages the motor. The battery pack, controller, and motor generate heat during operation, leading to overheating, which affects tool performance and poses safety hazards. To address these issues, traditional circular saws are equipped with fans and air inlets and outlets to generate cooling airflow. However, in traditional circular saws, the air used for the battery pack and controller flows in the same air channel. The airflow, which has already cooled the battery pack and thus increased in temperature, then cools the controller, reducing cooling efficiency. Therefore, it is necessary to provide a power tool that solves these problems. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the problem to be solved by the present invention is to provide a power tool that can effectively cool the battery pack and controller and has a compact structure.

[0004] To solve the above problems, the technical solution of the present invention is as follows: The power tool includes: a motor for driving a working head to work; a tool housing including a motor housing for accommodating the motor and a gripping housing; a fan driven by the motor to rotate and generate cooling airflow, the tool housing having an airflow channel for the cooling airflow to pass through; the airflow channel including a first airflow channel and a second airflow channel, the first airflow channel being independent of the second airflow channel; the tool housing having a first cooling vent communicating with the first airflow channel and a second cooling vent communicating with the second airflow channel; a battery pack for supplying power to the motor, including a housing and battery cells housed in the housing, the housing including an air inlet and an air outlet, the air inlet and the air outlet communicating to form a battery pack airflow channel, the battery pack airflow channel communicating with the first airflow channel when the battery pack is attached to the tool housing; and a controller for controlling the motor, the controller being at least partially disposed in the second airflow channel.

[0005] The power tool shown in this invention has two independent airflow channels for cooling the battery pack and the controller respectively, so that the two airflows cooling the battery pack and the controller do not affect each other, and both the battery pack and the controller can be fully cooled, improving cooling efficiency and meeting the requirements of cutting operations.

[0006] Preferably, the motor is an external rotor type motor. Using an external rotor type motor results in high torque and small size, which can further reduce the tool size while ensuring cutting efficiency.

[0007] Preferably, the motor housing includes a first end near the working head and a second end away from the working head. The fan is disposed in the first end, and an air outlet is provided at the first end. Cooling airflow entering from the battery pack airflow channel enters the first airflow channel through the first cooling air outlet and is discharged from the tool housing through the air outlet. Cooling airflow entering from the second cooling air outlet flows through the second airflow channel and is discharged from the tool housing through the air outlet.

[0008] Preferably, the motor housing includes a first end near the working head and a second end away from the working head. The fan is disposed in the first end, and the second end is provided with an air inlet. The cooling airflow entering through the air inlet flows through the first airflow channel and the second airflow channel respectively. The cooling airflow in the first airflow channel passes through the first cooling air outlet and is discharged through the battery pack airflow channel. The cooling airflow in the second airflow channel passes through the controller and is discharged through the second cooling air outlet.

[0009] Preferably, the motor housing includes a first end near the working head and a second end away from the working head. The fan is disposed in the second end, and an air outlet is provided at the second end. Cooling airflow flowing from the battery pack airflow channel through the first cooling air outlet into the first airflow channel and cooling airflow flowing from the second cooling air outlet into the second airflow channel pass through the motor and are discharged from the tool housing through the air outlet.

[0010] Preferably, the tool housing is provided with a separator that divides the airflow channel into a first airflow channel and a second airflow channel.

[0011] Preferably, the tool housing is provided with a separator, and the controller includes a circuit board and a housing that supports and at least partially surrounds the circuit board. The separator and the housing work together to divide the airflow channel into a first airflow channel and a second airflow channel.

[0012] Preferably, the controller includes a circuit board and a housing that supports and at least partially surrounds the circuit board. The housing has a partition that cooperates with the housing to divide the airflow channel into a first airflow channel and a second airflow channel. Preferably, the grip housing includes a grip portion, a mounting portion connected to the grip portion, and a connecting portion, wherein the mounting portion is used to mount the battery pack, and the airflow channel is at least partially located within the connecting portion.

[0013] Preferably, the first cooling air vent is disposed on the mounting portion, and the second cooling air vent is disposed on the connecting portion.

[0014] Preferably, a baffle is provided between the first cooling vent and the grip portion. The baffle prevents airflow from crossing between the grip portion and the first airflow channel, keeping the first airflow channel relatively closed, thereby not affecting the heat dissipation of the battery pack.

[0015] Preferably, the long side of the controller extends perpendicularly to the motor shaft of the motor.

[0016] Preferably, the separator is fixed relative to the inner surface of the tool housing, and the separator extends from between the first and second cooling vents to the outer side of the motor. Preferably, the mounting portion is located behind the grip portion in the cutting direction, and in the vertical direction, the grip portion is located above the connecting portion.

[0017] Preferably, the controller is located at the connecting part, positioned between the motor and the battery pack in the cutting direction and below the grip in the vertical direction. The battery pack is located behind the grip in the cutting direction, and the controller is positioned between the motor and the battery pack in the cutting direction and below the grip in the vertical direction. This arrangement makes efficient use of space and makes the tool more compact overall.

[0018] Preferably, the controller is provided with a heat sink that extends in a direction away from the first airflow channel.

[0019] Preferably, the controller is located at the connecting part, and the controller is located between the motor and the battery pack in the cutting direction, and below the gripping part in the vertical direction.

[0020] Preferably, the first airflow channel includes an airflow channel that is flush with the second airflow channel.

[0021] Preferably, the mounting portion is provided with a slide rail that mates with the battery pack, and the extension direction of the slide rail is inclined relative to the extension direction of the connecting portion.

[0022] Preferably, the connecting portion is provided with an outer side plate parallel to the extending direction of the slide rail, and the second cooling air vent is disposed on the outer side plate.

[0023] Preferably, the mounting portion has an inner side plate parallel to the extension direction of the slide rail, and the first cooling air vent is disposed on the inner side plate. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a perspective view of the power tool provided by the present invention.

[0026] Figure 2 for Figure 1 The power tool shown is a cross-sectional view.

[0027] Figure 3 for Figure 1 The diagram shows the air duct after removing part of the gripping housing of the power tool.

[0028] Figure 4 for Figure 1 The diagram shows a split-half view of the grip housing of the power tool.

[0029] Figure 5 for Figure 1 A cross-sectional view of the controller of the power tool shown.

[0030] Figure 6 for Figure 1 A partial sectional view of the power tool shown.

[0031] Figure 7 This is a schematic diagram of the air duct after removing part of the grip housing, which is an embodiment of a power tool.

[0032] Figure 8 This is a schematic diagram of the air duct after removing part of the grip housing, which is an embodiment of a power tool. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the invention. However, the invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] This embodiment uses an electric circular saw as an example to illustrate the technical solution of the present invention. However, the power tool of the present invention is not limited to an electric circular saw, but can also be other power tools powered by a battery pack, such as a jigsaw.

[0035] To facilitate understanding of this application, this specification is written in a manner that is easy for the reader to comprehend. Figure 1 The vertically upward direction is above the electric circular saw 100, and the vertically downward direction is below the electric circular saw 100.

[0036] It is worth noting that the definitions of directions in this specification are merely for the convenience of explaining the technical solutions of this application, and do not limit the direction of the electric circular saw in the embodiments of this application in scenarios that may cause the orientation or position of the components to be reversed or changed, including but not limited to use, testing, transportation, and manufacturing. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figure 1 and Figure 2 As shown, the power tool is an electric circular saw 100 as an example. The electric circular saw includes a motor 10, a tool housing 20 that houses the motor 10, and a working head 11 driven by the motor 10 to rotate and perform cutting operations. Here, the working head 11 is a saw blade, which is mounted on a drive shaft 12. Since the saw blade 11 has a certain thickness, in the following description, the saw blade 11 is idealized to have an extremely small thickness, and the plane on which the saw blade 11 is located is defined as the saw blade plane. Normal operation is defined. Figure 1 When the circular saw 100 is shown, the cutting direction of the saw blade 11 is the cutting direction F.

[0038] The circular saw 100 includes a fixed guard 13 attached to the tool housing 20 for covering the upper half of the saw blade 11, and a movable guard 14 covering the lower half of the saw blade 11 and rotatable coaxially with the drive shaft 12 of the saw blade 11. The circular saw 100 also includes a base plate 15 connected to the fixed guard 13, which has a bottom surface 151 that can slide on the surface of the material to be cut, such as wood, and a saw blade groove through which the saw blade 11 can protrude downward from the bottom surface 151 to cut the workpiece.

[0039] The fixed guard 13 is pivotally connected to the base plate 15. The fixed guard 13 rotates relative to the base plate 15 about the cutting depth axis X1, changing the distance the saw blade 11 extends beyond the bottom surface 151, thereby changing the cutting depth. The cutting depth axis X1 is parallel to the axis X2 of the drive shaft 12. The circular saw 100 is also provided with a depth locking mechanism 16, which is used to lock the relative position of the fixed guard 13 with respect to the base plate 15, and also to lock the cutting depth of the saw blade 11.

[0040] The fixed guard 13 rotates relative to the base plate 15 around the bevel cutting axis (not shown), thereby changing the tilt angle of the saw blade 11 relative to the bottom surface 151 to perform bevel cutting. The bevel cutting axis is perpendicular to the cutting depth axis X1 and parallel to the bottom surface 151. The circular saw 100 is also provided with a bevel cutting locking mechanism 18, which is used to fix the relative position of the guard 13 relative to the base plate 15, and also lock the tilt angle of the saw blade 11.

[0041] The tool housing 20 includes a motor housing 21 that houses the motor 10 and a gripping housing 24 connected to the motor housing 21. The motor housing 21 is fixedly connected to the fixed cover 13. The motor 10 includes a motor shaft 101, which is supported inside the motor housing 21 by a bearing 103. The axis 102 of the motor shaft 101 is perpendicular to the saw blade plane and parallel to the axis X2 of the drive shaft 12. The end of the motor 10 closest to the saw blade 11 is defined as the motor front end, and the end furthest from the saw blade 11 is defined as the motor tail end. In this embodiment, the fan 16 is located at the motor tail end and is fixed relative to the motor shaft 101, and is driven by the motor 10 to generate cooling airflow. In this embodiment, the fan 16 is a centrifugal fan, which minimizes the tool size while ensuring effective cooling.

[0042] The transmission mechanism is located between the motor 10 and the drive shaft 12, and is used to transmit the power of the motor 10 to the saw blade 11 to drive the saw blade 11 to rotate. The transmission mechanism can be a gear transmission, a worm gear, a belt transmission, etc. In this embodiment, the transmission mechanism is a gear transmission mechanism, including a small gear on the motor shaft 101 and a large gear on the drive shaft 12.

[0043] Motor 10 is an external rotor brushless motor, including a stator 107 fixed relative to the motor housing 21 and a rotor 105 rotating around the outer periphery of the stator 107. The rotor 105 is a sleeve-shaped structure with through holes at both ends, and its rear peripheral edge is fixedly connected to the fan blades of the fan 16. The fan 16 is fixedly connected to the motor shaft 101. Therefore, the external rotor 105 is fixedly connected to the motor shaft 101 through the fan 16. This method eliminates the need for an additional rear sidewall of the rotor 105 connected to the motor shaft 101, allowing for a more compact layout of motor 10 and fan 16. Furthermore, the fan 16 can be made of rigid metal, ensuring connection rigidity and providing better heat dissipation. External rotor motors inherently have the advantages of high torque and small size, which can further reduce the tool size when applied to electric circular saws. Of course, an internal rotor motor can also be used, which can also drive the fan to rotate and generate cooling airflow.

[0044] The grip housing 24 includes a grip portion 23 for operation and a connecting portion 27 located below the grip portion 23. The grip portion 23 is provided with a switch assembly 231 for controlling motor start-up. The connecting portion 27 extends longitudinally, its extension direction being approximately parallel to the saw blade plane and perpendicular to the axis 102 of the motor shaft 101. In this embodiment, the circular saw is a DC circular saw, including a battery pack 30 for powering the motor 10. A mounting portion 25 for mounting the battery pack is provided on the rear side of the grip portion 23. A slide rail (not shown) is provided on the mounting portion 25, through which the battery pack 10 slides and engages with the grip housing 24. The extension direction of the slide rail is inclined relative to the extension direction of the connecting portion, which can reduce the overall size of the machine. Of course, the circular saw may also use AC power instead of a battery pack. The grip portion 23 may be integrated into the tool housing 20 or connected to it as a separate component.

[0045] See also Figure 3 To control the brushless motor 10, the circular saw should also include a controller 40. The controller 40 includes at least a drive circuit, which includes a switching element for switching the power supplied to the brushless motor and a control circuit for controlling the drive circuit. To cool the battery pack 30 and the controller 40, the tool housing 20 also has airflow channels for cooling airflow. Specifically, the airflow channels include a first airflow channel 71 and a second airflow channel 73. The first airflow channel 71 is independent of the second airflow channel 73; the first airflow channel 71 serves as a cooling path for the battery pack 20, and the second airflow channel 73 serves as a cooling path for the controller 40. The tool housing 20 is provided with a first cooling vent 61 and a second cooling vent 63 communicating with the outside, wherein the first cooling vent 61 is connected to the first airflow channel 71; and the second cooling vent 63 is connected to the second airflow channel 73. In this embodiment, the first and second cooling vents 61 and 63 are air inlets for the cooling airflow to enter. Airflow entering from the first cooling vent 61 flows along the direction of arrow "A" through the first airflow channel 71 to the fan 16, and airflow entering from the second cooling vent 63 flows along the direction of arrow "B" through the second airflow channel 73 to the fan 16. In the connecting part of the grip housing 24, the cooling airflow through the first airflow channel 71 will not mix with the cooling airflow through the second airflow channel 73. That is, the airflow cooling the battery pack 30 will not pass through the controller 40; conversely, the airflow cooling the controller 40 will not pass through the battery pack 30. In other words, both the battery pack 30 and the controller 40 are cooled by cold air. This arrangement ensures that both the battery pack 30 and the controller 40 can be adequately cooled, improving cooling effect and efficiency. The first cooling vent 61 and the second cooling vent 63 can be slit-shaped or perforated, as long as they can communicate with the outside cold air. Their shape and number are not specifically limited. To prevent foreign objects from being sucked in, dust filters or other structures can be installed at the air inlets, or a submersible air inlet design can be adopted.

[0046] like Figure 3 and Figure 4 As shown, a first cooling vent 61 is disposed on the mounting portion 25, and first and second airflow channels 71 and 73 are disposed on the mounting portion 25 and the connecting portion 27. The first airflow channel 71 includes an airflow channel flush with the second airflow channel 73; this arrangement effectively utilizes the space of the connecting portion 27. An inner side plate 62, approximately parallel to the extending direction of the slide rail, is provided on the mounting portion 25, and the first cooling vent 61 is disposed on this inner side plate 62. When the battery pack 30 is connected to the mounting portion 25, the cooling airflow from the battery pack, under the action of the fan 16, carries away the heat from the battery pack 30 through the first airflow channel 71.

[0047] Specifically, the battery pack 30 includes a plurality of battery cells 31 and a housing 33 for housing the battery cells. The housing 33 is also provided with an air inlet 331 and an air outlet 333. The air inlet 331 and the air outlet 333 are connected to form a battery pack airflow channel (not labeled). Here, the battery pack airflow channel includes the gaps between each battery cell 31 and the gaps between the battery cell 31 and the housing 33. When the battery pack 30 is connected to the mounting part 25, the air outlet 333 is connected to the first cooling air outlet 61. The battery pack cooling airflow flows into the housing 33 through the air inlet 331, flows over the surface of each battery cell 31, and then flows out through the air outlet 333 and enters the first airflow channel 71 in the tool housing 20 through the first cooling air outlet 61, so that the heat of the battery pack 30 is dissipated under the action of the battery pack cooling airflow.

[0048] To enhance the heat dissipation of the battery pack 30, a fan for generating airflow can be installed between the air inlet 331 and the air outlet 333. The battery pack motor is installed inside the housing 33 to drive the fan to rotate.

[0049] The second cooling vent 63 is provided on the connecting portion 27, and the controller 40 is arranged in the second airflow channel 73. In this embodiment, the connecting portion 27 is provided with an outer side plate 64 parallel to the extending direction of the slide rail, and the second cooling vent 63 is provided on the outer side plate 64. Of course, the second cooling vent is located at the end of the connecting portion 27 away from the fan 16 and close to the controller 40, which can ensure that the airflow passes through the entire controller and improve cooling efficiency. Of course, in order to increase the air intake, multiple second cooling vents can also be provided on the connecting portion 27, such as on the upper part of the connecting portion 27 or on both sides of the connecting portion 27.

[0050] like Figure 5As shown, the controller 40 includes a circuit board 41, a housing 45 supporting and surrounding the circuit board, and a heat sink 43 extending substantially perpendicularly to the housing 45 and mounted on the circuit board 41. Specifically, the housing 45 is a non-conductive material, such as plastic. The main heat-generating components on the circuit board 41, such as MOSFETs, are connected to the heat sink 43 via thermally conductive silicone 47, ensuring that all heat generated by the circuit board is conducted to the heat sink 43. Thermally insulating sealant 49 is filled between the circuit board 41 and the housing 45, and between the heat sink 43 and the housing 45, preventing heat transfer to the housing 45.

[0051] like Figure 3 and Figure 4 , Figure 6 As shown, the housing 45 of the controller 40 is supported and fixed by ribs 29 inside the tool housing 20 and is located within the second airflow channel 73. The long side 451 of the housing 45 extends in a direction substantially perpendicular to the axis of the motor shaft 101, and is substantially parallel to the extension direction of the connecting part 27. In the cutting direction F, the controller 40 is located between the motor 10 and the battery pack 30, and vertically between the grip part 23 and the base plate 15. The controller 40 is positioned at a height between the grip part 23 and the base plate 15 so that it does not affect the operator's gripping operation. The heat sink 43 on the controller 40 extends substantially perpendicular to the housing 45 toward the base plate 15. The second cooling vent 63 is located at the end of the controller 40 away from the fan 16 and close to the heat sink 43, thus ensuring maximum contact area of ​​the cooling airflow with the heat sink 43 and improving cooling efficiency.

[0052] like Figure 3 and Figure 4 As shown, the electric circular saw 100 includes a separator 50, which cooperates with the connecting part 27 to divide the airflow channel into a first airflow channel 71 and a second airflow channel 73. In this embodiment, the separator 50 extends from between the first cooling vent 61 and the second cooling vent 63, passing over the top of the controller housing 45, to the motor housing 21. The motor housing 21 has a through hole 211, and the cooling airflow flows through the first airflow channel 71 and the second airflow channel 73 respectively, then flows into the motor housing 21 through the through hole 211. The separator 50 extends from the mounting part 25 to the through hole 211 of the motor housing 21.

[0053] The separator 50 can be an extended rib integrated with the inner surface of the tool housing 20, or a separator plate fixed to and tightly fitted with the inner surface of the tool housing 20. Preferably, the separator 50 is made of a non-thermal-conducting material. The separator 50 divides the airflow channel into upper and lower parts: a first airflow channel 71 for cooling the battery pack 30 is on the upper part, and a second airflow channel 73 for cooling the controller 40 is on the lower part.

[0054] As shown in Figure 4, in this embodiment, the grip 23, mounting part 25, and connecting part 27 are integrated as a whole, forming a left-right split-shell structure. The separator 50 is a rib extending from the inner surface of the tool housing 20, and is located on each of the two halves of the housing. When the two halves are assembled together, the two separator parts join together and function to separate airflow. This arrangement facilitates the disassembly and assembly of the tool and the replacement of internal parts. It is worth noting that the controller 40 is located in the connecting part 27, and the switch assembly 231 is located in the grip 23. Since the switch assembly 231 needs to be electrically connected to the controller 40, an opening 51 must be made in the separator 50 for the power supply line to pass through. In this case, the opening 51 needs to be kept as small as possible, and it can be sealed using measures such as sponge or sealant. To prevent air from flowing between the grip 23 and the first airflow channel 71, affecting the heat dissipation of the battery pack 30, a baffle 53 is provided between the first cooling vent 61 and the grip 23. The baffle 23 can be formed and made of the same material as the separator 50, which will not be described in detail here. Of course, the baffle 53 also has an opening for the power supply line to pass through. However, the opening should be as small as possible, or sealed with sponge or sealant, so as to ensure that the first airflow channel 71 is relatively closed.

[0055] The motor housing 21 includes a first end near the saw blade 11 (partially housed in the fixed cover 13) and a second end away from the saw blade 11. An air outlet 60 is located at the second end of the motor housing 21, that is, radially outward of the fan 16. Of course, the fan can also be considered an axial fan, so the air outlet can be located in the axial direction of the fan, not radially outward. Cooling airflow from the first airflow channel 71 and the second airflow channel 73 enters the motor housing 21 through the through-hole 211, converges within the motor housing 21, and cools the motor 10. Specifically, the cooling airflow passes through the gap between the rotor 105 and the stator 107 to dissipate heat from the motor 10. Then, it exits the tool housing 20 through the air outlet 60 on the motor housing 21.

[0056] Of course, a third air inlet (not shown) can also be provided on the motor housing 21, and the cold air entering from the third air inlet is specifically used to cool the motor 10. In order to improve the cooling efficiency, an airflow guiding device, such as a volute, can be added around the fan 16 to guide the airflow, improve the airflow efficiency, and thus enhance the cooling effect.

[0057] Since the first airflow channel 71 and the second airflow channel 73 are separated from each other, they are independent of each other. The first airflow channel 71 serves as the cooling path for the battery pack 30, and the second airflow channel 73 serves as the cooling path for the controller 40. Therefore, it avoids the situation where the airflow that has already cooled one of the battery pack 30 or the controller 40 affects the other of the battery pack 30 or the controller 40. Both can be adequately cooled, improving cooling efficiency and preventing machine failure due to overheating.

[0058] Furthermore, the first airflow channel 71 and the second airflow channel 73 are formed only by a separator; no other components are involved, so the formation cost of the first airflow channel 71 and the second airflow channel 73 is low and the structure is simple.

[0059] Furthermore, the controller 40 is located between the motor 10 and the battery pack 30 in the machining direction, and between the grip 23 and the base plate 15 in the vertical direction, with its long side 451 extending perpendicularly to the axis 102 of the motor shaft 101. This layout rationally utilizes the space of the entire tool, maintains a compact grip structure without affecting the operator's handling, and ensures effective cooling of the controller 40.

[0060] Furthermore, the airflow in the first airflow channel 71 and the airflow in the second airflow channel 73 can both be generated by a single fan 16. Therefore, it is not necessary to provide separate fans for each airflow channel in the tool, which avoids increasing the size of the circular saw and reduces the cost of providing additional fans.

[0061] like Figure 7 As shown, another embodiment of the present invention provides an electric circular saw 100a. Similar to the electric circular saw 100 in the first embodiment, it includes a tool housing 20, which includes a motor housing 21 housing a motor (not shown) and a gripping housing 24 connected to the motor housing 21. A fan (not shown) is located at the tail end of the motor, and an air outlet is provided at the second end of the motor housing 21 away from the saw blade 11. The air outlet is located radially outward of the fan. Two independent airflow channels, a first airflow channel 71 and a second airflow channel 73, are provided within the gripping housing 24, respectively for cooling the battery pack and the controller 40.

[0062] In this embodiment, the first cooling vent 61 and the second cooling vent 63 are air inlets, and their specific structures are basically the same as in the first embodiment, so they will not be described again here. The difference lies in the separator between the first airflow channel 71 and the second airflow channel 73. In this embodiment, the separator 50a extends to the end of the housing 45 of the controller 40 and abuts tightly against the housing 45. The separator 50a and the housing 45 work together to divide the airflow channel into two. Here, the separator 50a can be an extended rib integrated with the inner surface of the tool housing 20, or a separator plate fixed to and tightly fitted with the inner surface of the tool housing 20; similarly, the separator 50a is preferably made of a non-thermal conductive material.

[0063] Under the combined action of the separator 50 and the housing 45, the battery pack cooling airflow flows in the direction of arrow "A" in the first airflow channel 71, passing above the separator 50 and the housing 45, and then enters the motor housing 21. The airflow entering from the second cooling vent 63 flows in the direction of arrow "B" through the second airflow channel 73, passing below the separator 50 and the housing 45, cooling the controller 40, and then enters the motor housing 21. During this process, because the controller housing 45 is not thermally conductive, the heat from the battery pack cooling airflow will not affect the controller 40, and vice versa, thus achieving the independence of the two airflow channels.

[0064] In this embodiment, the controller housing 45 is preferably abutted against the outside of the motor housing 21. A gap between the housing 45 and the motor housing 21 is also permissible, but this gap should not be too large, preferably not exceeding 1 cm. In this case, since the gap is relatively close to the fan 16, and thus closer to the negative pressure center of the fan, the stronger the fan's ability to draw airflow. Therefore, the cooling airflow from the first airflow channel 71 and the second airflow channel 73 will directly enter the motor housing 21 under greater pressure without interfering with each other.

[0065] Of course, the box body can also be equipped with a divider, which cooperates with the box body to divide the airflow channel into a first airflow channel and a second airflow channel. Here, the divider can be integrally formed with the box body; or it can be a partition plate fixed to the box body and tightly fitted therewith; similarly, the divider and the box body are preferably made of a non-thermal conductive material.

[0066] like Figure 8As shown, another embodiment of the present invention provides an electric circular saw 100b. Similar to the electric circular saw 100 in the first embodiment, it includes a tool housing 20, which includes a motor housing 21 housing a motor (not shown) and a gripping housing 24 connected to the motor housing 21. The gripping housing 24 has two independent airflow channels, a first airflow channel 71 and a second airflow channel 73, respectively used for cooling the battery pack 30 and the controller 40.

[0067] The difference is that in this embodiment, the fan (not shown) is located at the front end of the motor, and an air inlet 80b is provided at the second end of the motor housing 21 away from the saw blade 11. This air inlet 80b can be provided on the end face of the motor housing 21 away from the saw blade 11 and / or on the circumferential surface of the motor housing 21, which can increase the air intake.

[0068] In this embodiment, the first cooling vent 61b and the second cooling vent 63b are air outlets. The first cooling vent 61b is connected to the battery pack airflow channel via an air inlet (not shown) on the battery pack. The airflow entering from the air inlet 80b flows through the motor and then enters the first airflow channel 71 and the second airflow channel 73 respectively. The airflow entering the first airflow channel 71 flows along the direction of arrow "C" through the first cooling vent 61b and then enters the battery pack airflow channel, cooling the battery pack 30, and then exits through the air outlet 333b on the battery pack 30. The airflow entering the second airflow channel 73 flows along the direction of arrow "D" through the controller 40, cooling the controller 40, and finally exits from the tool housing 20 through the second cooling vent 63b.

[0069] In this embodiment, although the cooling airflow for cooling the battery pack 30 and controller 40 is the airflow after cooling the motor, the motor's temperature rise during operation is not too high, while the battery pack 30 and controller 40 reach very high temperatures, especially the controller 40, which can reach 70 or 80 degrees Celsius. Furthermore, air inlets 80b can be provided on both the end face and the circumferential surface of the motor housing 21 at the second end away from the saw blade 11, allowing for a large airflow. Moreover, the cooling airflow through the first airflow channel 71 is relatively independent from the cooling airflow through the second airflow channel 73, ensuring that both the battery pack 30 and controller 40 are adequately cooled. Therefore, even when using the airflow after cooling the motor to cool the battery pack 30 and controller 40, the cooling effect is not affected.

[0070] In another embodiment, the fan is located at the front end of the motor. An air outlet is provided at the first end of the motor housing near the saw blade. This air outlet is located radially outward of the fan. An air inlet is provided at the second end of the motor housing. Similarly, the air inlet can be located on the end face of the motor housing away from the saw blade and / or on the circumferential surface of the motor housing. Under the action of the fan, cooling gas enters through the air inlet at the second end, flows through the motor, cools the motor, and then exits the tool housing through the air outlet on the outer side of the fan. In this embodiment, similar to the first embodiment, the cooling airflow in the first and second airflow channels enters the motor housing through a through-hole. However, unlike the first embodiment, the cooling airflow entering the motor housing through the through-hole does not need to flow through the motor; instead, it exits the tool housing directly through the air outlet on the outer side of the fan. Thus, within the grip housing, there are also two independent airflow channels, the first and second airflow channels, used for cooling the battery pack and controller, respectively. Additionally, the cooling airflow enters the motor housing through the second end of the motor housing to cool the motor. That is, the cooling air for the battery pack, controller, and motor is all cold air. This arrangement ensures that the motor, battery pack, and controller can all be adequately cooled, improving the cooling effect and efficiency.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and any modifications or improvements that achieve the same or similar functions as the present invention should be covered within the scope of protection of the present invention.

Claims

1. A power tool, characterized in that: The power tool includes: The motor drives the working head to perform its work; The tool housing includes a motor housing that houses the motor and a grip housing, wherein the motor housing is provided with a through hole and an air outlet; A fan, driven by the motor to rotate, generates cooling airflow, and the tool housing is provided with an airflow channel for the cooling airflow to pass through; A separator extends to the through hole of the motor housing, dividing the airflow channel into a first airflow channel and a second airflow channel, wherein the first airflow channel is independent of the second airflow channel; the tool housing is provided with a first cooling vent communicating with the first airflow channel and a second cooling vent communicating with the second airflow channel; A battery pack for powering the motor includes a housing and battery cells housed in the housing. The housing includes an air inlet and an air outlet, which are connected to form a battery pack airflow channel. When the battery pack is attached to the tool housing, the battery pack airflow channel is connected to the first airflow channel. A controller for controlling the motor, the controller being at least partially disposed in the second airflow channel; The fan is driven to rotate by the motor, and cooling airflow enters from the first cooling vent and flows through the first airflow channel, and cooling airflow enters from the second cooling vent and flows through the second airflow channel; the cooling airflow flowing through the first airflow channel and the second airflow channel flows through the through hole and enters the motor housing, where it converges to cool the motor before being discharged from the air outlet.

2. The power tool as described in claim 1, characterized in that: The motor is an external rotor type motor.

3. The power tool as described in claim 1, characterized in that: The motor housing includes a first end near the working head and a second end away from the working head. The fan is disposed in the first end and has an air outlet. Cooling airflow entering from the battery pack airflow channel enters the first airflow channel through the first cooling air outlet and exits from the tool housing through the air outlet. Cooling airflow entering from the second cooling air outlet flows through the second airflow channel and exits from the tool housing through the air outlet.

4. The power tool as described in claim 1, characterized in that: The motor housing includes a first end near the working head and a second end away from the working head. The fan is disposed in the first end, and the second end is provided with an air inlet. The cooling airflow entering through the air inlet flows through the first airflow channel and the second airflow channel respectively. The cooling airflow in the first airflow channel passes through the first cooling air outlet and is discharged through the battery pack airflow channel. The cooling airflow in the second airflow channel passes through the controller and is discharged through the second cooling air outlet.

5. The power tool as described in claim 1, characterized in that: The motor housing includes a first end near the working head and a second end away from the working head. The fan is disposed in the second end, and an air outlet is provided at the second end. Cooling airflow flowing from the battery pack airflow channel through the first cooling air outlet into the first airflow channel and cooling airflow flowing from the second cooling air outlet into the second airflow channel pass through the motor and are discharged from the tool housing through the air outlet.

6. The power tool as described in claim 1, characterized in that: The tool housing is provided with a separator, and the controller includes a circuit board and a housing that supports and at least partially surrounds the circuit board. The separator and the housing work together to divide the airflow channel into a first airflow channel and a second airflow channel.

7. The power tool as described in claim 1, characterized in that: The controller includes a circuit board and a housing that supports and at least partially surrounds the circuit board. The housing has a partition that cooperates with the housing to divide the airflow channel into a first airflow channel and a second airflow channel.

8. The power tool as described in claim 1, characterized in that: The grip housing includes a grip portion, a mounting portion connected to the grip portion, and a connecting portion, wherein the mounting portion is used to mount the battery pack, and the airflow channel is at least partially located within the connecting portion.

9. The power tool as described in claim 8, characterized in that: A baffle is provided between the first cooling vent and the grip portion.

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