Power tool

Abstract

The application discloses a power tool, which comprises a casing, a power mechanism including a rotatable driving shaft, a polarization mechanism for generating oscillation, an output mechanism including a mounting member in transmission connection with the polarization mechanism, and further comprising an air flow element connected with the driving shaft and driven to rotate by the driving shaft to generate air flow, and a heat conduction part supported on the driving shaft, wherein the air flow element is arranged on the outer periphery of the heat conduction part, an air inlet is arranged on the casing to allow air flow to enter, and an air outlet is arranged on the casing downstream of the air inlet to allow air flow to flow out. The polarization mechanism comprises a supporting assembly sleeved on the driving shaft and an oscillating member arranged to be driven to oscillate by the supporting assembly. Heat generated by the polarization mechanism is conducted to the heat conduction part through the driving shaft, and the heat conductivity of the heat conduction part is greater than or equal to 50 W / m o C. The power tool has better heat dissipation performance.

Description

Technical Field

[0001] This invention relates to a power tool, specifically a swing-type power tool. Background Technology

[0002] Oscillating multi-tools, as a type of power tool, typically achieve operations such as cutting and grinding by using their oscillating components to drive the oscillating attachments. Due to the high-frequency vibration of the oscillating components, heat often concentrates in the attachments, accelerating component failure and potentially leading to overall machine failure. Therefore, existing oscillating multi-tools are limited by the lifespan of their oscillating components, preventing further increases in oscillation angle and output speed. This restricts improvements in cutting speed and power. Thus, improving the efficiency and power of oscillating multi-tools without sacrificing overall machine lifespan has become a pressing technical problem in this field. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a power tool that balances service life and performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A power tool includes: a housing extending in a front-rear direction; a power mechanism including a rotatable drive shaft; a polarization mechanism for generating oscillation; an output mechanism including a mounting member drively connected to the polarization mechanism; an airflow element connected to and driven by the drive shaft to generate cooling airflow; an air inlet on the housing for allowing cooling airflow to enter; an air outlet on the housing downstream of the air inlet for allowing cooling airflow to exit; a heat-conducting section supported on the drive shaft, with the airflow element disposed on the outer periphery of the heat-conducting section; the polarization mechanism includes: a support assembly sleeved on the drive shaft; and an oscillating member configured to be driven by the support assembly to oscillate. Heat generated by the polarization mechanism is conducted to the heat-conducting section via the drive shaft, and the heat-conducting section has a thermal conductivity greater than or equal to 50 W / m•℃.

[0005] In some embodiments, the power mechanism further includes a flow-limiting mechanism disposed within the housing upstream of the airflow element. The flow-limiting mechanism fills the space between the inner wall of the housing and the power mechanism to prevent the cooling airflow from flowing back upstream.

[0006] In some embodiments, the power mechanism includes a power housing, and a flow limiting mechanism is filled between the outer periphery of the power housing and the inner wall of the housing.

[0007] In some embodiments, the current limiting mechanism is a flexible element.

[0008] In some embodiments, the inner wall of the housing and / or the power housing are provided with grooves and / or ribs for positioning the flow limiting mechanism.

[0009] In some embodiments, the current limiting mechanism is a sponge pad or a rubber pad; the current limiting mechanism is fixed to the outer peripheral surface of the power housing.

[0010] In some embodiments, the flow limiting mechanism includes a plurality of annular baffles formed on the inner wall of the housing and / or the power housing.

[0011] In some embodiments, a shock-absorbing mechanism is provided between the power housing and the engine housing.

[0012] In some embodiments, the damping mechanism includes multiple damping components of different dimensions, which are respectively arranged on the power housing to buffer forces acting in different directions.

[0013] In some embodiments, the damping mechanism includes a first-dimensional damping component and a second-dimensional damping component, which are disposed on the transmission housing in a generally perpendicular direction to each other; wherein, the first-dimensional damping component and the second-dimensional damping component are disposed on the outer periphery of the motor housing; and the second-dimensional damping component is disposed on the outer periphery of the transmission housing.

[0014] In some embodiments, both the first-dimensional damping component and the second-dimensional damping element include a shock-absorbing damping element; at least the first-dimensional damping component also includes a buffer damping element.

[0015] In some embodiments, the axial distance between the portion of the heat-conducting part that contacts the drive shaft is L1, the distance between the heat-conducting part of the drive shaft and the heat conduction portion between the heat-conducting part and the support assembly is L2, and the ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5.

[0016] A power tool includes: a housing extending in a front-rear direction; a power mechanism including a motor housing and a motor disposed within the motor housing, the motor including a rotatable drive shaft; a polarization mechanism for generating oscillation; an output mechanism including a mounting member drivenly connected to the oscillating member; and a working attachment selectively connected to the mounting member; the polarization mechanism includes: a transmission housing connected to the motor housing; a support assembly sleeved on the drive shaft; and an oscillating member supported by the support assembly and driven to polarize by the support assembly; the motor housing further includes a lead wire fixing mechanism, the lead wire fixing mechanism including: a lead wire fixing part for fixing a lead wire.

[0017] In some embodiments, a lead wire channel is formed within the lead wire fixing portion, allowing motor wires to pass through.

[0018] In some embodiments, the lead channel extends from the shaft end of the motor.

[0019] In some embodiments, the lead fixing mechanism further includes an internal damping element that allows the wire to pass through and be embedded in the lead channel.

[0020] In some embodiments, the lead wire fixing mechanism further includes an external damping component, which includes multiple damping components of different dimensions. The multiple damping components are respectively arranged around the outer periphery of the lead wire fixing part and are used to buffer forces in different directions.

[0021] In some embodiments, the external damping assembly includes a first-dimensional damping assembly and a second-dimensional damping assembly, which are disposed on the transmission housing in a generally perpendicular direction to each other.

[0022] In some embodiments, both the first-dimensional damping component and the second-dimensional damping element include a shock-absorbing damping element; at least the first-dimensional damping component also includes a buffer damping element, and the shock-absorbing damping element and the buffer damping element are made of different materials.

[0023] In some embodiments, the lead wire fixing mechanism further includes an end fixing member, which is fixed to the shaft end of the lead wire fixing part.

[0024] In some embodiments, the power tool further includes a heat conduction and heat dissipation mechanism, which includes: a heat conduction part supported on a drive shaft; and an airflow element that generates airflow as the drive shaft rotates; wherein at least the heat conduction part is made of metal, and the heat generated by the polarization mechanism is conducted to the heat conduction and heat dissipation mechanism via the drive shaft.

[0025] In some embodiments, the axial distance between the portion of the heat-conducting part that contacts the drive shaft is L1, the distance between the heat-conducting part of the drive shaft and the heat conduction portion between the heat-conducting part and the support assembly is L2, and the ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5.

[0026] In some embodiments, the density of the heat-conducting and heat-dissipating mechanism is 2.70 g / cm³.

[0027] A power tool includes: a housing extending in a front-rear direction; a power mechanism including a rotatable drive shaft; a polarization mechanism for generating oscillation, including a transmission housing; an output mechanism including a mounting member drively connected to the polarization mechanism; a working attachment selectively connected to the mounting member; an accessory including a tool portion and an operating portion; and an accessory clamp including: a clamp body detachably connected to the transmission housing; an accessory mounting portion disposed on the clamp body and adapted to fix the operating portion; and a fastening assembly adapted to lock the clamp body in place, including a locking member for locking the clamp body, the locking member including a torque transmission hole adapted for inserting an end of the operating portion to perform locking and unlocking operations, the torque transmission hole being a non-circular hole.

[0028] In some embodiments, the torque transmission hole includes at least one straight edge for transmitting torque, and the operating part includes a torque transmission plane that engages with the straight edge.

[0029] In some embodiments, the accessory mounting part includes a through hole provided on the clamp body and a fixing member adapted to connect with the through hole. The fixing member fixes and locks the operating part in the through hole. The operating part also includes a locking plane that cooperates with the fixing member for locking.

[0030] In some embodiments, the operating part is a hexagonal prism and the locking element is an internal hex screw.

[0031] In some embodiments, the accessories include a depth gauge and / or a guide gauge.

[0032] In some embodiments, the accessory fixture further includes a limiting member disposed on the inner peripheral surface of the fixture body, and the transmission housing includes a positioning groove that allows the limiting member to move axially in and out.

[0033] In some embodiments, the accessory fixture further includes a plurality of diagonal members disposed on the inner circumferential surface of the fixture body, which are used to identify the installation angle of the accessory fixture.

[0034] In some embodiments, the power tool further includes a heat conduction and heat dissipation mechanism, which includes: a heat conduction part supported on a drive shaft; and an airflow element that generates airflow as the drive shaft rotates; wherein at least the heat conduction part is made of metal, and the heat generated by the polarization mechanism is conducted to the heat conduction and heat dissipation mechanism via the drive shaft.

[0035] In some embodiments, the axial distance between the heat-conducting part and the drive shaft is L1, the heat conduction distance between the drive shaft and the heat-conducting part and the support assembly is L2, and the ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5.

[0036] In some embodiments, the power tool further includes a heat conduction and heat dissipation mechanism, which includes: a heat conduction part supported on a drive shaft, wherein heat generated by the polarization mechanism is conducted to the heat conduction and heat dissipation mechanism via the drive shaft, and the heat conduction and heat dissipation mechanism has a thermal conductivity greater than or equal to 50 W / m•℃; and an airflow element connected to the heat conduction part, wherein the airflow element generates airflow as the drive shaft rotates.

[0037] A power tool includes: a housing extending in a longitudinal direction; a power mechanism including a motor housing and a motor disposed within the motor housing, the motor including a rotatable drive shaft; a polarization mechanism for generating oscillation; an output mechanism including a mounting member drively connected to the oscillating member; and a working attachment selectively connected to the mounting member. The polarization mechanism includes: a transmission housing connected to the motor housing; a support assembly sleeved on the drive shaft; and an oscillating member supported on the support assembly and driven by the support assembly to polarize. The power tool further includes: an oil reservoir unit disposed on the support assembly and / or the drive shaft, the oil reservoir unit storing a lubricating medium.

[0038] In some embodiments, the oil storage unit includes an oil trough disposed on the drive shaft.

[0039] In some embodiments, the oil groove includes a spiral groove formed on the surface of the drive shaft, and / or a straight groove formed on the surface of the drive shaft.

[0040] In some embodiments, the oil groove includes a core groove disposed within the drive shaft and a connecting groove, the connecting groove connecting the core groove and the outer peripheral surface of the drive shaft.

[0041] In some embodiments, the core groove extends axially along the drive shaft, and the connecting groove extends radially along the drive shaft.

[0042] In some embodiments, the support assembly includes a support frame and rolling elements, wherein the support frame has an oil groove extending through its circumference.

[0043] In some embodiments, the power tool further includes a heat conduction and heat dissipation mechanism, which includes: a heat conduction part supported on a drive shaft; and an airflow element that generates airflow as the drive shaft rotates; wherein at least the heat conduction part is made of metal, and the heat generated by the polarization mechanism is conducted to the heat conduction and heat dissipation mechanism via the drive shaft.

[0044] In some embodiments, the axial distance between the heat-conducting part and the drive shaft is L1, the heat conduction distance between the drive shaft and the heat-conducting part and the support assembly is L2, and the ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5.

[0045] In some embodiments, the power tool further includes a heat conduction and heat dissipation mechanism, which includes: a heat conduction part supported on a drive shaft, wherein heat generated by the polarization mechanism is conducted to the heat conduction and heat dissipation mechanism via the drive shaft, and the heat conduction and heat dissipation mechanism has a thermal conductivity greater than or equal to 50 W / m•℃; and an airflow element connected to the heat conduction part, wherein the airflow element generates airflow as the drive shaft rotates.

[0046] In some embodiments, the output mechanism further includes an output shaft connected to the swing member, and a mounting member is disposed on the output shaft; the output shaft has a swing angle α centered on the output shaft axis, wherein the swing angle α is greater than or equal to 3°; and the motor speed is greater than or equal to 15000 rpm.

[0047] The advantages of this invention are: by setting up the above-mentioned heat conduction and heat dissipation mechanism, this invention allows the oscillating power tool to work at a higher speed, thereby increasing the cutting speed, while allowing the output mechanism to have a larger swing angle, thereby improving the working power of the oscillating power tool, and at the same time ensuring the reliability and stability of the oscillating power tool. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the power tool of the present invention; Figure 2 yes Figure 1A schematic diagram of the structure of the power tool after the left housing is opened; Figure 3 yes Figure 1 Top view of a power tool; Figure 4 yes Figure 3 Sectional view of AA; Figure 5 This is a schematic diagram of the power mechanism, polarization mechanism, and output mechanism of the power tool of the present invention; Figure 6 yes Figure 5 A top view of the power mechanism, polarization mechanism, and output mechanism of the power tool shown. Figure 7 yes Figure 5 A schematic diagram of the assembly of the motor housing of the power tool shown; Figure 8 yes Figure 7 A schematic diagram of the lead wire fixing mechanism of the power tool shown. Figure 9 This is an assembly diagram of the output shaft, polarization mechanism, and power mechanism of the present invention; Figure 10 This is a schematic diagram of the assembly of the polarization mechanism and the motor shaft of the present invention; Figure 11 yes Figure 10 BB section view; Figure 12 This is an assembly structure diagram of the power tool of the present invention and one of its accessories; Figure 13 This is a schematic diagram illustrating the assembly and disassembly of a component clamp for the power tool of the present invention. Figure 14 This is an assembly structure diagram of the power tool and another accessory of the present invention; Figure 15 This is a schematic diagram of the assembly and disassembly of another accessory fixture for the power tool of the present invention; Figure 16 This is an assembly diagram of the accessory fixture for the power tool of the present invention; Figure 17 This is a schematic diagram of the component clamp of the present invention; Figure 18 This is a schematic diagram of the oil storage unit of one embodiment of the power tool of the present invention; Figure 19 This is a schematic diagram of the oil storage unit of another embodiment of the power tool of the present invention; Figure 20 This is a schematic diagram of the oil storage unit of another embodiment of the power tool of the present invention; Figure 21 yes Figure 20 The image shows the front view of the oil storage unit; Figure 22 yes Figure 21 A cross-sectional view of the oil storage unit shown; Figure 23 This is a structural diagram of the right fuselage. Detailed Implementation

[0049] like Figure 1 As shown, this invention provides a power tool 100, which can be a handheld swing-type power tool, such as a swing-type multi-functional tool. The power tool 100 includes various working attachments 200, such as a shovel, triangular sander, metal saw blade, woodworking saw blade, diamond saw blade, etc. Through these different working attachments 200, the power tool 100 can perform functions such as sawing, sanding, filing, and shoveling.

[0050] A power tool 100 of the present invention includes a tool body 100a, which includes a housing 110, a power mechanism 300, a polarization mechanism 400, an output mechanism 500, a heat conduction and heat dissipation mechanism 600, and a power source. The power source in this invention is a battery pack 700. However, in other embodiments, the power source may also include a plug and cable for connecting to external AC power.

[0051] like Figures 2-3 As shown, the housing 110 includes a first housing 111 and a second housing 112, wherein the first housing 111 and the second housing 112 together form the outer shell of the tool, and the second housing 112 has a gripping portion 112a for the user to hold. The first housing 111 can partially extend into the second housing 112, thereby forming a whole. Of course, the first housing 111 may also not extend into the second housing 112 and be connected to the second housing by other connecting components such as screws.

[0052] The power mechanism 300 of the present invention includes a power housing, wherein the power housing includes a motor housing 340 and a transmission housing 310, wherein the transmission housing 310 houses a polarization mechanism 400 and an output mechanism 500, and the motor housing 340 houses a motor 320 and a motor shaft configured as a drive shaft 330.

[0053] The first housing 111 at least partially covers the outside of the transmission housing 310, and the transmission housing 310 extends from the first housing 111 into the second housing 112.

[0054] The second housing 112 may specifically include a left housing 112b and a right housing 112c, the left housing 112b and the right housing 112c being essentially related to one such housing. Figure 1 and Figure 3The center plane 101 shown is symmetrically arranged, so the handle portion 112a formed by the left housing 112b and the right housing 112c is also basically symmetrical about the center plane 101, and the first housing 111 is also basically symmetrical about the center plane 101.

[0055] The motor housing 340 is disposed within the second housing 112, and the motor shaft extends into the transmission housing 310 and connects to the polarization mechanism 400. The motor shaft is an eccentric shaft, comprising a first shaft portion 331 and a second shaft portion 332. The centerline of the second shaft portion 332 is equidistant from the centerline of the first shaft portion 331. The first shaft portion 331 is drive-connected to the polarization mechanism 400, and the second shaft portion 332 is connected to the heat dissipation mechanism 600. Alternatively, in another embodiment, the drive shaft 330 can be connected to the motor shaft via a conventional transmission mechanism, in which case the drive shaft 330 itself is an eccentric shaft.

[0056] The motor 310 also includes a motor control unit, as detailed in the appendix. Figure 7 - Appendix Figure 8 The motor control unit includes a control circuit board assembly 322, which is connected to the motor via leads on one side and to the motor via motor wires 321 on the other side. Figure 2 The main control component 120 of the machine shown is electrically connected to the power supply. The control circuit board assembly 322 is located at the shaft end of the motor 310, and the motor wire 321 is led out from it and connected to the main control component 120. In this embodiment of the invention, the main control component 120 is also a circuit board assembly. A shock-absorbing component is provided between the main control component 120 and the machine casing 110 to reduce the vibration of the main control component. Specifically, the shock-absorbing component may include one or more of the following: elastic shock-absorbing components and shock-absorbing ribs disposed within the casing 110. Figure 23 As shown, the shock absorber in this embodiment of the invention includes shock absorber ribs 131 disposed around the main control component 120, wherein the shock absorber ribs 131 can be integrally formed with the housing 110; the shock absorber also includes elastic shock absorbers 132 disposed on the left and right sides of the main control component. Specifically, a hollow annular mounting seat 133 is formed on the inner wall of the housing 110. The mounting seat 133 can be a plastic part integrally formed with the housing 110, and the elastic shock absorber 132 is provided in the mounting seat 133, wherein the elastic shock absorber 132 is integrally injection molded into the mounting seat 133 by a soft rubber covering the housing 110. Of course, the elastic shock absorber 132 can also be a separately provided elastic element, such as a rubber ring or rubber pad, etc., which is not limited here.

[0057] As an alternative implementation, elastic damping elements may be provided around the main control component 120, rather than being limited to its left and right directions.

[0058] To prevent relative movement between the motor wire 321 and the control circuit board assembly 322 caused by vibration during the operation of the power tool, which could lead to connection failure of the motor wire 321, the motor housing 340 in this embodiment also includes a lead wire fixing mechanism 340a, which includes a lead wire fixing part 341 and an inner shock absorber 350.

[0059] like Figure 7 As shown, the lead wire fixing part 341 is used to fix the lead wire and is provided at the axial end of the motor housing 340 away from the polarization mechanism 400. Specifically, the lead wire fixing part 341 is an annular boss formed at the axial end of the motor housing 340. A lead wire channel 341a is formed in the lead wire fixing part 341 to allow the motor wire 321 to pass through. The lead wire channel 341a extends in a direction parallel to the motor axis. Of course, the lead wire fixing part can also be provided at other positions on the motor housing, which is not limited here.

[0060] like Figure 8 As shown, the inner damping component 350 is embedded in the lead wire channel 341a. Specifically, the inner damping component 350 is an annular damping component, such as an annular rubber ring. The inner damping component 350 is snapped into the lead wire channel 341a of the lead wire fixing part 341. By providing the lead wire channel 341a parallel to the direction of the motor axis, the lead-out direction of the motor lead wire 321 is approximately parallel to the motor axis. At the same time, the inner damping component 350 for shock absorption provided in the lead wire channel 341a can effectively buffer the movement of the motor lead wire 321 relative to the control circuit board assembly 322.

[0061] like Figures 7-8 As shown, the lead wire fixing mechanism 340a also includes an end fixing member 360, which is fixed to the shaft end of the lead wire fixing part 341. Specifically, the end fixing member 360 is a fixing plate with a central through hole for the motor wire 321 to pass through. Mounting holes are provided around the fixing plate, and corresponding mounting holes are also provided at the axial ends of the annular boss constituting the lead wire fixing part 341. The end fixing member 360 is fixed to the lead wire fixing part 341 by fasteners such as screws. The end fixing member 360 is used to limit and fix the internal shock absorber, further ensuring the reliability of the internal shock absorber.

[0062] like Figure 4 As shown, the inner side of the motor housing 340 is also provided with a support cavity 342, which is used to install the bearing that supports the motor drive shaft 330.

[0063] The polarization mechanism 400 in this embodiment is used to directly generate vibration. The polarization mechanism 400 includes a support assembly 410 and a swing member, specifically a fork 420, as shown below. Figures 9-11As shown, the support assembly in this embodiment includes a bearing 411 and a ball sleeve 412. The ball sleeve 412 is sleeved on the first shaft portion 331 of the motor shaft 320 through the bearing 411. When the second shaft portion 332 rotates with the motor shaft 310, the bearing 411 reciprocates left and right in the left-right direction perpendicular to the split plane 101 under the drive of the first shaft portion 331. In this embodiment, the bearing 411 is a double-row ball bearing to improve the support strength of the swinging component.

[0064] like Figure 9 and Figure 10 As shown, the ball sleeve 412 is fitted around the outer periphery of the bearing 411 and is in rolling connection with the bearing 411. It can be understood that the bearing 411 is a ball or roller bearing, with the balls or rollers mounted on the bearing cage. The ball sleeve 412 is fitted around the outer periphery of the bearing 411, wherein the balls or rollers support rolling between the motor shaft and the ball sleeve. The ball sleeve 412 has a partial outer cylindrical surface, and the oscillating member includes a partial inner cylindrical surface that mates with the ball sleeve 412. The partial inner cylindrical surface of the oscillating member is fitted onto the partial outer cylindrical surface and can be driven to move by the ball sleeve 412.

[0065] See appendix Figure 18 - Appendix Figure 22 The polarization mechanism 400 of the power tool in this embodiment of the invention further includes an oil storage unit 431, wherein the oil storage unit 431 is disposed on the support assembly 410 and / or the drive shaft 330, and the oil storage unit 431 is used to store a lubricating medium, such as lubricating oil. The oil storage unit 431 stores the lubricating medium to reduce the heat generated during the operation of the power tool.

[0066] The oil storage unit 431 includes an oil trough disposed on the drive shaft 330. See appendix. Figure 19 In this embodiment of the invention, the yoke drive shaft 330 can be the rear 330 of a motor. Specifically, as shown in the figure, the oil groove can include a spiral groove formed on the surface of the drive shaft 330. Alternatively, the oil groove can include a straight groove formed on the surface of the drive shaft.

[0067] As attached Figure 20 - Appendix Figure 22 As shown, as an alternative embodiment of the oil storage unit 431, the oil sump may further include a core groove 432 and a connecting groove 433 disposed within the drive shaft 330. The connecting groove 433 connects the core groove 432 and the outer peripheral surface of the drive shaft 330, and is used to transfer the lubricating oil stored in the core groove 432 to the surface of the drive shaft 330 when the drive shaft 330 rotates, thereby achieving lubrication of the bearing 411 on its surface. Specifically, the core groove 432 extends approximately along the axial direction of the drive shaft 330, and the connecting groove 433 extends approximately along the radial direction of the drive shaft 330. Of course, the arrangement of the core groove 432 and the connecting groove 433 is not limited to this; it is sufficient that the core groove is disposed inside the drive shaft 330, and the connecting groove connects the core groove to the outer peripheral surface of the drive shaft 330.

[0068] like Figure 18 As shown, in an alternative embodiment of the oil storage unit 431, the bearing 411 includes a support frame 411a and rolling elements 411b, wherein the support frame 411a is provided with an oil storage groove 434 penetrating its circumference. Specifically, the support frame 411a is a ring with an opening for mounting the rolling elements 411b. The support frame 411a is used to mount and support the rolling elements 411b, which can be balls or rollers. The ring constituting the support frame 411a is also provided with a plurality of oil storage grooves 434 penetrating the circumference of the ring, and the lubricating oil in the oil storage grooves 434 is used to lubricate the rolling elements 411b.

[0069] By providing an oil storage unit 431, the service life of the support assembly 410 is improved, thereby increasing the service life of the entire machine.

[0070] See appendix Figure 11 In this embodiment, the output mechanism 500 includes an output shaft 510 for outputting power. In its non-operating state, the output shaft 510 has a generally vertically extending output shaft axis 511. The oscillating fork 420 includes a mounting portion 421 and an oscillating fork 422, wherein... Figure 9 and Figure 10 As shown, the swing fork 422 is sleeved on a portion of the outer circular surface of the ball sleeve 412 and can rotate at least relative to the ball sleeve 412. The mounting part 421 is a sleeve that is sleeved on the output shaft 510 of the output mechanism 500. See attached figure. Figure 10 When not in operation, the two forks of the swing fork 422 are located on the left and right sides of the split plane 101, respectively. Therefore, when the ball sleeve 412 moves, it will repeatedly strike the forks on both sides in the left-right direction, causing the swing fork 422 to swing left and right. This swing fork 422 then drives the output shaft 510 to swing within a certain range, ultimately driving the working attachment 200 to oscillate. It can be understood that in this embodiment, the direction F of the polarized excitation force generated by the power tool 100 during operation is substantially perpendicular to the split plane 101. In other words, the working attachment 200 reciprocates in a direction substantially perpendicular to the split plane 101.

[0071] Please refer to the appendix again. Figure 11 The output mechanism 500 also includes a mounting member 520, which is disposed on the output shaft 510 and is connected to the shift fork 420 via the output shaft 510. Multiple working accessories 200 can be selectively mounted and connected to the mounting member 520. In this embodiment, the mounting member 520 is a clamp.

[0072] For the oscillating multi-functional tool of this embodiment, its vibration is mainly generated by the eccentric shaft driving the bearing 411 and the ball sleeve 412 to rotate and the rotating ball sleeve 412 reciprocatingly impacting the shift fork 420. Therefore, the whole consisting of the bearing 411, the ball sleeve 412 and the shift fork 420, i.e. the polarization mechanism 400, can be regarded as the vibration source.

[0073] Because the shift fork 420 repeatedly impacts the ball sleeve 412 during the swing process, the heat generated by the impact is very large when the motor speed and swing angle α reach a certain value. The existing multi-functional tools cannot achieve a very good heat dissipation effect. Therefore, it is usually necessary to sacrifice a part of the speed or swing angle, that is, sacrifice the cutting speed or the cutting power, or both at the same time to meet the service life requirements.

[0074] As the market demands for the working power of multi-functional tools increase, the increase in working power and cutting speed requires a corresponding increase in the swing angle of the working attachment and the motor speed. On the other hand, the increase in motor speed and swing angle causes a significant increase in the heat generated by the collision between the fork and the outer sleeve. Therefore, in order to improve the heat dissipation performance and service life of the existing swing-type power tool 100, and at the same time improve the cutting power and cutting speed, a heat conduction and heat dissipation mechanism 600 is also provided in this invention.

[0075] like Figures 9-11 As shown, in this embodiment, the heat dissipation mechanism 600 is supported on the second shaft portion 332 of the motor shaft, while the polarization mechanism 400 is supported on the first shaft portion 331 of the motor shaft via a bearing 411, as illustrated in the attached diagram. Figure 11 The axis of the first shaft portion 331 is eccentrically set with the axis of the second shaft portion 332. In other words, the support axis of the heat conduction and heat dissipation mechanism 600 is parallel to and spaced apart from the support axis of the polarization mechanism 400. In this embodiment, the eccentricity ∆d between the axis of the first shaft portion 331 and the axis of the second shaft portion 332 is approximately 1.1 mm.

[0076] By providing a heat conduction and heat dissipation mechanism 600 on the motor shaft that supports the vibration source that generates the main heat, the heat from the vibration source that generates a lot of heat can be conducted and dissipated, thereby further extending the service life of the power tool 100.

[0077] See appendix Figure 11 The heat conduction and heat dissipation mechanism 600 includes a cylindrical heat conduction part 610 and an airflow element 620, wherein the airflow element 620 is disposed on the outer periphery of the heat conduction part 610, the heat conduction part 610 is sleeved on the motor shaft, and the airflow element 620 generates airflow as the motor shaft rotates.

[0078] See Appendix for details. Figure 1The power tool 100 of the present invention also has an air inlet 113 and an air outlet 114 on its housing 110. The air inlet 113 allows cooling airflow to enter, and the air outlet 114 is located downstream of the air inlet 113, allowing cooling airflow to exit. The airflow moves in a direction from upstream to downstream. It can be understood that in this embodiment, the upstream is approximately the rear of the machine body, and the downstream is approximately the front of the machine body.

[0079] The airflow element 620 includes a plurality of blades formed on the heat-conducting portion 610, and the housing 110 includes at least an air outlet corresponding to the position of the blades. In this embodiment, the heat-conducting portion 610 and the airflow element 620 are integrally formed. Of course, as an alternative embodiment, the heat-conducting portion 610 and the airflow element 620 can also be formed separately, in which case the airflow element 620 includes mounting holes suitable for mounting on the heat-conducting portion 610. The forming method of the heat-conducting portion 610 and the airflow element 620 is not limited here.

[0080] The heat-conducting and heat-dissipating mechanism 600 is supported on the motor shaft. The heat generated by the polarization mechanism 400 is conducted to the heat-conducting and heat-dissipating mechanism 600 via the motor shaft. In this embodiment, the heat-conducting and heat-dissipating mechanism 600 is made of metal. Its thermal conductivity is greater than or equal to 50 W / m•℃, preferably 96 W / m•℃. The density of the heat-conducting and heat-dissipating mechanism 600 is preferably 2.70 g / cm³. In this embodiment, the heat-conducting and heat-dissipating mechanism 600 is an aluminum die-casting part, which has superior thermal conductivity and relatively light weight while meeting heat dissipation performance requirements. In this embodiment, the heat-conducting part 610 and the airflow element 620 are integrally formed. The thermal conductivity of the heat-conducting and heat-dissipating mechanism 600 is also the thermal conductivity of the heat-conducting part 610 and the airflow element 620. The thermal conductivity of the heat-conducting part 610 is greater than or equal to 50 W / m•℃, and the thermal conductivity of the airflow element 620 is greater than or equal to 50 W / m•℃. In other embodiments, the heat-conducting part may be disposed separately from the airflow element, and the thermal conductivity of the heat-conducting part may be greater than or equal to 50 W / m•℃. In other embodiments, the heat-conducting part may also be disposed separately from the airflow element, and the thermal conductivity of the airflow element may be greater than or equal to 50 W / m•℃.

[0081] Furthermore, in order to improve heat dissipation, such as Figure 5 and Figure 6As shown, in this embodiment, the power tool 100 has several guide ribs 311 on the outer periphery of the transmission housing 310. The guide ribs 311 are correspondingly arranged with the airflow elements of the heat dissipation mechanism 600. This helps to increase the heat dissipation area between the transmission housing 310 and the outside, and also facilitates smooth airflow. The power tool 100 also includes a wind deflector 800, which is disposed around the heat dissipation mechanism 600 and partially or completely overlaps with the heat dissipation mechanism 600 in the axial direction to guide the airflow of the airflow elements of the heat dissipation mechanism 600 to the air outlet.

[0082] The power tool 100 of this embodiment, on the one hand, directly contacts the motor shaft with a heat-conducting and heat-dissipating mechanism 600 that has good thermal conductivity, and transfers the heat generated at the support component 410 of the polarization mechanism 400 to the heat-conducting and heat-dissipating mechanism 600 through heat conduction. On the other hand, by providing an airflow element 620 on the heat-conducting and heat-dissipating mechanism 600, the airflow element 620 is driven to rotate by the motor shaft to generate airflow, which plays an auxiliary role in heat dissipation. Therefore, the heat-conducting and heat-dissipating mechanism 600 in this embodiment has better thermal conductivity and heat dissipation performance, thereby realizing the timely transfer and dissipation of heat at the support component 410, improving the cooling efficiency of the support component 410, and further improving the service life of the power tool 100.

[0083] In addition, for oscillating power tools, the distance between the heat dissipation and heat conduction mechanism 600 and the vibration source cannot be infinitely close due to the limitations of the overall structure. That is, they need to be set at a certain distance. If the distance between the heat dissipation and heat conduction mechanism 600 and the vibration source is too far, the heat dissipation efficiency of the heat dissipation and heat conduction mechanism 600 in dissipating heat from the vibration source will be reduced.

[0084] In view of this, see Appendix Figure 11In this embodiment, the axial distance 610a between the heat conduction and heat dissipation mechanism 600 and the motor shaft of the drive shaft 330 is L1. In other words, L1 is the axial length of the cylindrical heat conduction part 610. The distance 330a between the heat conduction part 330a of the drive shaft 330 and the support assembly 410 is L2. In other words, L2 is the axial distance between the axial front end of the cylindrical heat conduction part 610 and the axial rear end of the bearing 411. The ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5, that is, 0.1≤L1 / L2≤5. For example, L1 is 2mm~20mm and L2 is 4mm~20mm. The axial length L1 of the heat dissipation mechanism 600 in contact with the motor shaft is preferably 8mm to 20mm, and the axial distance L2 between the axial front end of the cylindrical heat dissipation part 610 and the axial rear end of the bearing 411 is preferably 8mm to 20mm. The ratio of the axial distance L1 to the distance L2 is preferably greater than or equal to 0.5 and less than or equal to 2.5. In this embodiment, the axial length L1 of the heat dissipation mechanism 600 in contact with the motor shaft is set to 13mm, and the axial distance between the axial front end of the cylindrical heat dissipation part 610 and the axial rear end of the bearing 411 is set to 13mm; that is, in this embodiment, the ratio of the axial distance L1 to the distance L2 is 1.

[0085] By setting the relative positions of the heat conduction and heat dissipation mechanism 600 and the vibration source as described above, it avoids both interference caused by being too close to the vibration source and weakening of the heat conduction and heat dissipation function by being too far from the vibration source. Without affecting the overall performance of the machine, it significantly improves the situation of vibration source overheating failure or unstable working conditions caused by overheating. This improves the working stability and reliability of the power tool, extends the service life of the power tool, and improves the user experience.

[0086] Because of the heat dissipation and heat conduction mechanism 600, the speed of the motor 320 in this embodiment can be greater than or equal to 15,000 rpm. In this embodiment, the motor speed is 20,000 rpm, but it can also be set to 16,000 rpm or 17,000 rpm.

[0087] like Figure 10 As shown, in this embodiment, the oscillating power tool 100 has an output shaft 510 with an oscillation angle α centered on the output shaft axis 511. The output shaft 510 oscillates within the oscillation angle α. Due to the heat dissipation and heat conduction mechanism 600, the oscillation angle α of the power tool 100 is greater than or equal to 3°. In this embodiment, the oscillation angle α is 4°, meaning the output shaft 510 oscillates within a range of ±2° on both sides of the output axis 511. Of course, α can also be set to 5°, or any value between 3° and 5°. Based on this, the power of the oscillating power tool 100 in this embodiment can reach 500W.

[0088] In this embodiment, the heat conduction and heat dissipation mechanism allows the oscillating power tool to operate at a higher speed, thereby increasing the cutting speed. At the same time, it allows the output mechanism to have a larger swing angle, thereby improving the working power of the oscillating power tool and ensuring its reliability and stability.

[0089] See appendix Figure 4 - Appendix Figure 6 As shown, this embodiment of the invention also includes a flow-limiting mechanism 630, which is disposed within the housing 110, upstream of the airflow element 620. The flow-limiting mechanism 630 fills the space between the inner wall of the housing and the power mechanism 300 to prevent the cooling airflow from flowing back upstream. Specifically, the flow-limiting mechanism 630 fills the space between the inner wall of the housing and the outer periphery of the power housing. By providing the flow-limiting mechanism 630, the airflow discharged from the axial end of the airflow element 620 can be prevented from flowing back towards the front of the housing, thus avoiding disturbance of the internal airflow and affecting the smooth movement of the airflow and the cooling effect.

[0090] like Figures 5-6 The current limiting mechanism 630 in this embodiment of the invention can be a flexible element, such as a sponge pad or a rubber pad, specifically an annular sponge pad or an annular rubber pad. The current limiting mechanism 630 can be directly fixed to the outside of the motor housing 340, for example, by adhesive bonding to the outer periphery of the motor housing 340. Alternatively, the current limiting mechanism 630 can also be directly fixed to the inner wall of the housing.

[0091] As an alternative implementation, the current limiting mechanism can also be installed and positioned by grooves or ribs provided on the inner wall of the housing and / or the power housing. For example, a groove or rib is provided on the inner wall of the housing to allow the current limiting mechanism to engage, or a groove or rib is provided on the power housing to allow the current limiting mechanism to engage, or grooves or ribs are provided on both the power housing and the inner wall of the housing to allow the current limiting mechanism to engage, thereby achieving the limiting and fixing of the current limiting mechanism.

[0092] Furthermore, as another alternative implementation, the flow limiting mechanism can also be a rigid element, such as an annular baffle provided on the inner wall of the housing or the power housing. Of course, annular baffles can also be provided on both the inner wall of the housing and the power housing at the same time. In this case, the two sets of baffles can be set as a labyrinth structure to restrict the movement of airflow.

[0093] See appendix Figure 5 Appendix Figure 7 and attached Figure 8 The power tool 100 in this embodiment of the invention also includes a shock absorption mechanism, wherein the shock absorption mechanism is disposed between the power housing and the inner wall of the housing to reduce or decrease the impact of vibration on the power unit 300 during the operation of the whole machine.

[0094] Specifically, the damping mechanism includes multiple damping components of different dimensions, which are respectively arranged around the transmission housing 310 and / or the motor housing 340 to buffer forces acting in different directions. Specifically, multiple sets of damping components are respectively located between the power housing and the inner wall of the housing.

[0095] The damping mechanism includes a first-dimensional damping component 370 and a second-dimensional damping component 380, wherein the first-dimensional damping component 370 and the second-dimensional damping component 380 are arranged on the transmission housing in a generally perpendicular direction to each other.

[0096] The first-dimensional damping assembly 370 includes an inner and outer layer of shock-absorbing damping element 371 and buffer damping element 372. The shock-absorbing damping element 371 and buffer damping element 372 are made of different materials, or the shock-absorbing damping element 371 and buffer damping element 372 can be elastic elements with different densities, thereby improving the buffering and shock absorption effect on the lead wire fixing part 341.

[0097] The second-dimensional damping assembly 380 includes a shock-absorbing damping element 371. Of course, as an alternative implementation, the second-dimensional damping assembly 380 may also be configured to include an inner and outer stacked shock-absorbing damping element 371 and a buffer damping element 372.

[0098] Specifically, in embodiments of the present invention, such as Figure 5 As shown, at least one set of second-dimensional damping components 380 is provided on the outer periphery of the transmission housing 310. When multiple sets of second-dimensional damping components 380 are provided, the multiple second-dimensional damping components 380 are distributed on the outer periphery of the transmission housing 310 in a direction approximately parallel to the motor axis. It can be understood that several second-dimensional damping components 380 are provided on both the left and right sides of the body, and the second-dimensional damping components 380 on both sides are approximately symmetrically arranged with respect to the dividing surface 101.

[0099] like Figures 7-8 As shown, the power tool 100 of the present invention also includes a damping component disposed on the outer periphery of the motor housing 340. Specifically, the damping component is configured as an external shock absorption component on the outer periphery of the motor housing 340. The external shock absorption component may include multiple damping components of different dimensions. The multiple damping components are respectively disposed on the outer periphery of the lead wire fixing part 341 and are used to buffer forces acting in different directions.

[0100] Specifically, the external damping component of this embodiment includes a first-dimensional damping component 370 and a second-dimensional damping component 380. The first-dimensional damping component 370 and the second-dimensional damping component 380 are disposed on the outer periphery of the lead wire fixing portion 341 of the motor housing 340 in a generally perpendicular direction. Specifically, the first-dimensional damping component 370 is disposed on the outer periphery of the lead wire fixing portion 341 in a generally vertical direction, and the second-dimensional damping component 380 is disposed on the outer periphery of the lead wire fixing portion 341 in a generally horizontal direction.

[0101] Of course, the external shock absorption components are not limited to being set on the outer periphery of the lead wire fixing part 341, but can also be set on other parts of the outer periphery of the motor housing 340.

[0102] See appendix Figure 12 - Appendix Figure 15 The power tool 100 of the present invention also includes an accessory device 900, which includes an accessory 910 and an accessory clamp 920, wherein the accessory clamp 920 is used to mount and fix the accessory 910 to the transmission housing 310. Alternatively, the accessory 910 may also be mounted to other parts of the tool body 100a, such as to the housing 110 or the power mechanism 300.

[0103] The accessory fixture 920 includes a fixture body 921, an accessory mounting part 922a, and a fastening assembly 924a.

[0104] like Figure 17 As shown, the clamp body 921 is an annular clamp, which is located around the outer periphery of the transmission housing 310. The annular clamp is used to install the auxiliary accessory 910 when the working accessory is working.

[0105] like Figures 12-17 As shown, the accessory mounting part 922a is used to fix and install the accessory 910. Specifically, the accessory mounting part 922a includes a through hole 922 provided on the clamp body 921 and a fastener 923 for fixing and locking the accessory 910 in the through hole 922. The fastener 923 cooperates with a fixing hole provided on the side wall of the through hole 922. The fixing hole communicates with the through hole 922. For example, the fastener 923 is a knob or a bolt. The fastener 923 is threadedly connected to the fixing hole. The end of the fastener 923 enters the through hole 922 to fix and lock the accessory 910.

[0106] Furthermore, an anti-slip pad 923a is provided on the contact surface between the fastener 923 and the accessory 910 to prevent the accessory 910 from loosening and falling off. For example, the anti-slip pad 923a can be provided on the inner circumference of the through hole 922, or it can be provided on the end of the fastener 923. The anti-slip pad 923a can be made of rubber. Of course, the method of setting and the material of the anti-slip pad 923a are not limited to these; it is only necessary to increase the frictional resistance between the fastener 923 and the accessory 910.

[0107] Furthermore, the operating part 912 is provided with a locking plane 912b that cooperates with the fixing member 923 for locking. The end of the fixing member 923 presses against the locking plane 912b to fix and lock the operating part 912 in the through hole.

[0108] like Figures 12-17 As shown, the fastening assembly 924a of this embodiment of the invention is used to fix and lock the clamp body 921 to the transmission housing 310. Specifically, the fastening assembly 924a includes connecting holes 924 provided at two corresponding ends of the annular clamp and a locking member 925 threadedly engaged with the connecting holes 924. The annular clamp is locked and fixed to the transmission housing 310 by the locking member 925.

[0109] In this embodiment, accessory 910 is... Figure 12 The depth gauge described herein, wherein accessory 910 includes a tool part 911 and an operating part 912. The tool part 911 performs functions such as guiding and depth indication, and the operating part 912 drives the fastening assembly 924a to lock the clamp body 921. When the accessory is in use, the operating part 912 is fixed to the accessory mounting part 922a. The end of the fixing member 923 can pass through the fixing hole into the through hole 922 and press against the operating part 912 to achieve a pressing and locking effect on the operating part 912. Alternatively, as... Figure 14 and Figure 15 As shown, the accessory can also be a guide ruler 91. The tool part 911 is used to realize the function of the accessory. In this embodiment, the tool part 911 is used to realize the depth adjustment function, and the accessory 910 can adjust the cutting depth of the power tool 100. When the accessory is a guide ruler 91, the tool part is used to contact the workpiece to realize the guiding function, and the accessory can guide the power tool to move along the surface of the workpiece.

[0110] like Figure 13 As shown, the locking member 925 further includes a torque transmission hole 925a, which is a non-circular hole and includes at least one straight edge 925b for transmitting torque. The end of the operating part 912 can be inserted into the torque transmission hole 925a to perform locking and unlocking operations. Specifically, the operating part 912 includes a torque transmission plane 912a that mates with the straight edge 925b.

[0111] Specifically, in this embodiment of the invention, the locking member 925 is an internal hexagon screw, that is, the torque transmission hole is a hexagonal countersunk hole, and the corresponding operating part 912 is a hexagonal prism. At this time, there is no need for additional machining to form a torque transmission plane, and any plane of the hexagonal prism surface on the operating part 912 can constitute the locking plane 912b that cooperates with the fixing member 923.

[0112] Of course, as other alternative implementations, the torque transmission hole can be set as, for example, a rectangular hole, a triangular hole, a semi-circular hole or other irregularly shaped holes, and the corresponding operating part 912 of the accessory 910 can be set as a quadrangular prism, a triangular prism, a semi-cylinder or other non-cylinder, as long as the torque transmission hole includes a straight edge for transmitting torque and the operating part includes a plane for transmitting torque that cooperates with the straight edge.

[0113] Typically, the operating parts of existing power tools are cylindrical. The cylindrical operating parts are prone to slipping and rotating when fixed in the through hole by the fastener. In addition, the opening or locking of the locking parts in the accessory fixture requires the use of external tools such as hex wrenches.

[0114] like Figures 12-16 As shown, in this embodiment of the invention, the operating part 912 of the accessory 910 is set as a hexagonal prism. On the one hand, the hexagonal prism is a readily available raw material, and the internal hexagonal screw or internal hexagonal bolt is also a readily available connector in the art. Therefore, there is no need to additionally process the locking part 925 to form a torque transmission hole, nor is there need to additionally process the operating part 912 to form a torque transmission plane 912a and a locking plane 912b on its surface. This simplifies the processing technology, reduces labor and costs, improves the reliability of accessory assembly, simplifies the operation of the accessory fixture, and enhances the user experience. Figure 17 As shown, the accessory fixture 920 of this embodiment of the invention also includes a limiting member 926 disposed on the inner peripheral surface of the fixture body 921. For example, the limiting member 926 can be a plurality of protrusions disposed on the inner peripheral surface of the fixture body 921. The transmission housing 310 includes a positioning groove 312 that allows the limiting member 926 to move axially in and out. When the accessory fixture 920 is installed, it is inserted from the axial end of the transmission housing 310, so that the limiting member 926 is inserted into the positioning groove 312, thereby achieving the initial positioning of the accessory fixture 920 assembly.

[0115] The accessory clamp 920 of this embodiment of the invention also includes a plurality of diagonal members 927, which are similarly disposed on the inner peripheral surface of the clamp body 921. For example, the diagonal members 927 can be a plurality of pairs of bosses disposed on the inner peripheral surface of the clamp body 921, and the center line of a pair of bosses is used to indicate the corresponding scale. The diagonal members 927 and the limiting member 926 are axially spaced at the inner periphery of the clamp body 921. The diagonal members 927 are used to identify the mounting angle of the accessory clamp 920 onto the transmission housing 310.

[0116] Specifically, the diagonal members 927 are provided in multiple sets, for example, including a display accessory clamp 920 positioned relative to the transmission housing 310 as follows: Figure 17 The 0° diagonal member 927a shown is a 0° angled piece, and the vertical diagonal member 927b is used to show that the accessory clamp 920 is perpendicular to the transmission housing 310. Of course, the angle displayed by the diagonal members is not limited to the two mentioned above, and can also be provided as, for example, a 45° diagonal member, a 60° diagonal member, etc.

[0117] When accessory 910 is needed to guide the cutting depth of power tool 100, the clamp body 921 is first fitted onto tool body 100a. Then, the operating part 912 of accessory 910 drives the fastening assembly 924a to lock the clamp body 921 onto tool body 100a. Accessory 910 is then installed onto accessory mounting part 922a. At this point, accessory 910 can guide power tool 100 to cut different depths on the workpiece. When accessory 910 is not needed, the user can remove accessory 910 from accessory mounting part 922a and then use the operating part 912 to drive the fastening assembly 924a to release clamp body 921. In this way, accessory 910 can perform both its function as accessory 910 and the function of locking or releasing clamp body 921, without being lost, thus facilitating user operation.

[0118] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A power tool, comprising: chassis; The power mechanism includes a rotatable drive shaft; A polarization mechanism used to generate oscillation; The output mechanism includes a mounting component that is drively connected to the polarization mechanism; Its features are, The power tool also includes: An airflow element is connected to the drive shaft and is driven to rotate by the drive shaft to generate airflow; A heat-conducting part, the heat-conducting part being supported on the drive shaft, and the airflow element being disposed on the outer periphery of the heat-conducting part; An air inlet is located on the casing to allow airflow to enter; An air outlet is located on the housing downstream of the air inlet, allowing the airflow to exit. The polarization mechanism includes: A support assembly is sleeved on the drive shaft; The swing element is configured to be driven to swing by the support assembly; The heat generated by the polarization mechanism is conducted to the heat-conducting part via the drive shaft, and the thermal conductivity of the heat-conducting part is greater than or equal to 50 W / m•℃; The axial distance between the portion of the heat-conducting part that contacts the drive shaft is L1, and the distance between the drive shaft and the heat conduction portion between the heat-conducting part and the support assembly is L2. The ratio of the axial distance L1 to the distance L2 is greater than or equal to 0.1 and less than or equal to 5.

2. The power tool according to claim 1, characterized in that, The power tool also includes a flow-limiting mechanism disposed within the housing upstream of the airflow element. The flow-limiting mechanism fills the space between the inner wall of the housing and the power mechanism to prevent the airflow from flowing back upstream.

3. The power tool according to claim 2, characterized in that, The power mechanism includes a power housing, and the flow limiting mechanism is filled between the outer periphery of the power housing and the inner wall of the housing.

4. The power tool according to claim 2, characterized in that, The current limiting mechanism is a flexible element.

5. The power tool according to claim 1, characterized in that, The power tool further includes an oil storage unit for storing lubricating medium and disposed on the drive shaft and / or the support assembly.

6. The power tool according to claim 5, characterized in that, The oil storage unit includes an oil trough disposed on the drive shaft.

7. The power tool according to claim 5, characterized in that, The support assembly includes a support frame and rolling elements, and the support frame is provided with an oil groove extending through its circumference.

8. The power tool according to claim 1, characterized in that, The power mechanism also includes a motor housing, and the drive shaft is at least partially disposed inside the motor housing. The motor housing is connected to a lead wire fixing mechanism for fixing the motor wires.

9. The power tool according to claim 8, characterized in that, The lead wire fixing mechanism has a lead wire channel that allows the motor wires to pass through.

10. The power tool according to claim 9, characterized in that, The motor housing also includes an internal shock absorber that allows the motor wires to pass through and be embedded in the lead wire channel.

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