Power tools

Abstract

This application discloses a power tool, comprising: a locking mechanism for locking an output shaft when the output shaft transmits torque to a motor shaft; the locking mechanism comprising: a shaft lock frame connected to the output shaft to drive the output shaft; the shaft lock frame comprising a first inner surface surrounding a first outer peripheral surface in a circumferential direction; a first gap being provided between the first inner surface and the first outer peripheral surface; a damping assembly comprising a first mounting portion connecting the output shaft, a second mounting portion connecting the shaft lock frame, and a buffer portion; wherein the damping assembly is disposed outside the first gap and at least a portion of the buffer portion extends along a second axis; the buffer portion connects the first mounting portion and the second mounting portion; when the output shaft and the shaft lock frame move relative to each other, the buffer portion provides a buffering force to delay the movement of the output shaft relative to the shaft lock frame by undergoing torsional deformation.

Description

Technical Field

[0001] This application relates to an electric tool, and more specifically to a power tool that outputs torque through rotation. Background Technology

[0002] Power tools such as electric drills and screwdrivers are commonly used torque output tools on the market. In these types of power tools that output torque through rotation, the torque output from the motor shaft is transmitted to the output mechanism through a transmission mechanism, and finally acts on the workpiece.

[0003] In power tools that output torque through rotation, the output shaft is driven by the motor output shaft to rotate in the forward direction. When the machine stops or shifts gears, due to inertia or when the output shaft is actively rotated by the user, the torque on the output shaft is transmitted to the transmission mechanism and the motor shaft in the reverse direction. The reverse direction often damages components in the transmission mechanism, such as gears, and affects their lifespan. Furthermore, when unscrewing the chuck connected to the threaded connection on the output shaft, it is not desirable for the output shaft to rotate. Therefore, these power tools are often equipped with shaft locks.

[0004] In existing shaft lock structures, when the machine suddenly stops and brakes, the output shaft will collide with the shaft lock due to inertia, resulting in a strong impact. This not only causes impact noise but also poses a significant safety hazard and is very detrimental to the lifespan of the power tool.

[0005] Therefore, improving the impact problem during inertial braking using existing axle lock structures is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this application is to provide a power tool that solves the impact problem when the shaft lock structure stops, shifts gears or brakes, while not increasing the damping during normal operation and not affecting the overall efficiency of the machine.

[0007] To achieve the above objectives, this application adopts the following technical solution: A power tool includes: a housing; a motor including a motor shaft rotatable about a first axis relative to the housing; an output mechanism for outputting torque; and a motor-driven output mechanism. The output mechanism includes: an output shaft rotatable about a second axis relative to the housing, the output shaft having a first outer peripheral surface; a locking mechanism for locking the output shaft when the output shaft transmits torque to the motor shaft; the locking mechanism includes: a shaft lock bracket connected to the output shaft to drive the output shaft; the shaft lock bracket includes a first inner surface circumferentially surrounding the first outer peripheral surface; a first gap is provided between the first inner surface and the first outer peripheral surface; and a damping assembly including a first mounting portion connecting the output shaft, a second mounting portion connecting the shaft lock bracket, and a buffer portion connecting the first mounting portion and the second mounting portion; wherein the damping assembly is disposed outside the first gap and at least a portion of the buffer portion extends along the second axis; when the output shaft moves relative to the shaft lock bracket, the buffer portion provides a buffering force to delay the movement of the output shaft relative to the shaft lock bracket by undergoing torsional deformation.

[0008] In some embodiments, the first mounting part, the second mounting part, and the buffer part are an integral component.

[0009] In some embodiments, the locking mechanism further includes: a shaft locking ring disposed around the output shaft; a locking member disposed between the shaft locking ring and the output shaft, the locking member having at least a locked position and an unlocked position relative to the shaft locking ring; when the output shaft transmits torque to the motor shaft, the locking member is in the locked position, and the locking member locks the rotation of the output shaft relative to the housing; when the motor shaft transmits torque to the output shaft, the locking member releases the rotation of the output shaft relative to the housing when it is in the unlocked position; and a shaft locking frame further connected to or formed with a switching block inserted between the shaft locking ring and the locking member, the switching block being used to switch the locking member between the locked position and the unlocked position.

[0010] In some embodiments, by configuring a first gap, the shaft lock frame rotates relative to the output shaft within a preset angle range, so that the shaft lock frame drives the locking member to switch between a locked position and an unlocked position.

[0011] In some embodiments, the first mounting part rotates synchronously with the output shaft, and the second mounting part rotates synchronously with the shaft locking structure.

[0012] In some embodiments, the buffer portion includes a first buffer portion extending along a second axis and connected to a first mounting portion, and a second buffer portion extending in a direction perpendicular to the second axis and connected to a second mounting portion, wherein the first buffer portion and the second buffer portion are fixedly connected.

[0013] In some embodiments, the first mounting portion and the second mounting portion are arranged sequentially along the second axis.

[0014] In some embodiments, the buffer portion is formed or connected to an elastic structure.

[0015] A power tool includes: a housing; a motor including a motor shaft rotatable about a first axis relative to the housing; an output mechanism for receiving and outputting torque from the motor; including an output portion rotatable about a second axis relative to the housing; a locking mechanism for locking the output portion when the output portion transmits torque to the motor shaft; the locking mechanism connects the motor and the output mechanism; the locking mechanism includes: an input component for receiving torque transmitted from the motor and connecting to the output portion to drive the output portion; a damping component connecting the input component and the output portion; the damping component includes a buffer portion extending at least partially along the second axis; when the input component and the output portion move synchronously, the buffer portion moves synchronously with both the input component and the output portion; when the input component and the output portion move relative to each other, the buffer portion provides a buffering force to delay the movement of the output portion relative to the input component by undergoing torsional deformation.

[0016] A power tool includes: a housing; a motor including a motor shaft rotatable about a first axis relative to the housing; an output mechanism for receiving and outputting torque from the motor; an output shaft rotatable about a second axis relative to the housing, the output shaft having a first outer peripheral surface; a locking mechanism for locking the output shaft when the output shaft transmits torque to the motor shaft; the locking mechanism connecting the motor and the output mechanism; the locking mechanism includes: a shaft lock holder connected to the output shaft to drive the output shaft; the shaft lock holder includes a first inner surface that at least partially surrounds the first outer peripheral surface; a first gap is provided between the first inner surface and the first outer peripheral surface; a damping assembly outside the first gap, the damping assembly including an elastic element that provides a buffering force along the rotational direction of the output shaft to delay the movement of the output shaft relative to the shaft lock holder when relative movement occurs between the output shaft and the shaft lock holder.

[0017] This application provides a power tool with a buffer extending axially. When the output shaft and the shaft lock frame move relative to each other, the output shaft drives the buffer to undergo torsional deformation, buffering the movement of the output shaft relative to the shaft lock frame and delaying its movement. Consequently, the impact force of the output shaft striking the locking mechanism is reduced, improving the impact problem caused by inertia during braking, and particularly effectively reducing impact noise. In this embodiment, the damping component is located outside the first gap, without affecting the function of the first gap or increasing its design and assembly difficulty. The buffering efficiency is higher. During the forward transmission process, the output shaft and the shaft lock frame move almost synchronously, thus not increasing damping and not affecting the overall machine efficiency. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the first embodiment in this application; Figure 2 yes Figure 1Partial views of the internal structure diagram and half-section view; Figure 3 yes Figure 1 Structural diagram of the locking mechanism; Figure 4 yes Figure 1 A schematic diagram of the exploded view of the locking mechanism; Figure 5 yes Figure 4 Another perspective structural diagram of the locking mechanism; Figure 6 yes Figure 5 Left view structural diagram of the locking mechanism; Figure 7 yes Figure 5 Sectional view of AA; Figure 8 yes Figure 5 A cross-sectional view of BB, showing the locking element in the unlocked position; Figure 9 yes Figure 5 A cross-sectional view of the C-section, showing the locking element in the unlocked position; Figure 10 yes Figure 5 A cross-sectional view of BB, in which the motor rotates clockwise and the locking element is in the locked position; Figure 11 yes Figure 5 A cross-sectional view of the C-C section, showing the motor rotating clockwise and the locking element in the locked position; Figure 12 yes Figure 5 A cross-sectional view of BB, in which the motor rotates counterclockwise and the locking element is in the locked position; Figure 13 yes Figure 5 A cross-sectional view of CC, in which the motor rotates counterclockwise and the locking element is in the locked position; Figure 14 yes Figure 4 Schematic diagram of the structure of the medium damping component; Figure 15 This is a structural diagram of the locking mechanism of the second embodiment in this application; Figure 16 yes Figure 15 A schematic diagram of the structure of the medium damping component. Detailed Implementation

[0019] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] To clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The top, bottom, front, and back sides are shown.

[0023] like Figure 1 A power tool according to a first embodiment of this application is shown, which is an electric drill 100. It will be understood that in other alternative embodiments, the power may also be a power tool that outputs torque through rotation, such as an electric screwdriver, or a tool that combines the functions of a screwdriver and an electric drill, or other tools that convert torque into other forms of motion.

[0024] like Figures 1 to 3 A drill 100 according to a first embodiment of this application is shown, including a power supply device 30. The power supply device 30 provides electrical energy to the drill 100. In this embodiment, the power supply device 30 is a battery pack, which, in conjunction with a corresponding power circuit, supplies power to the corresponding components within the drill 100. Those skilled in the art should understand that the power supply device 30 is not limited to scenarios using a battery pack; it can also supply power to the corresponding components within the drill through mains power or AC power, in conjunction with corresponding rectification, filtering, and voltage regulation circuits.

[0025] The electric drill 100 includes a housing 11, a motor 12, a transmission mechanism 19, and an output mechanism 13. The housing 11 includes a motor housing 111 for housing the motor and an output housing 112 for housing at least part of the output mechanism 13, with the output housing 112 connected to the front end of the motor housing 111. The housing 11 also forms or is connected to a grip 113 for user operation. The grip 113 and the motor housing 111 form a T-shaped or L-shaped structure for easy gripping and operation. One end of the grip 113 is connected to a power supply 30. The power supply 30 is detachably connected to the grip 113. The electric drill 100 also includes a switch 122 mounted on the grip 113. When the user grips the grip 113, the user can relatively easily trigger the switch 122, which can be configured as a main switch to start the electric drill 100.

[0026] The motor 12, transmission mechanism 19, and output mechanism 13 are arranged sequentially in the front-to-back direction within the motor housing 111 and the output housing 112.

[0027] The motor 12 includes a motor shaft (not shown) that is rotatable about a first axis 101.

[0028] The output mechanism 13 is used to receive torque provided by the motor 12 and output torque. The output mechanism 13 includes an output shaft 14 for connecting and driving the working attachment to rotate. The front end of the output shaft 14 is provided with a clamping assembly 132 or a receiving part, which can clamp the corresponding working attachment, such as a screwdriver, drill bit, socket, etc., when performing different functions.

[0029] The output shaft 14 is used to output power. The output shaft 14 rotates about an output axis, which in this embodiment is the second axis 102. In this embodiment, the first axis 101 and the second axis 102 coincide. In other alternative embodiments, the second axis 102 and the first axis 101 are set at a certain angle. In other alternative embodiments, the first axis 101 and the second axis 102 are parallel to each other but do not coincide.

[0030] The transmission mechanism 19 is disposed between the motor 12 and the output mechanism 13, and is used to transmit power between the motor 12 and the output mechanism 13.

[0031] The structure and working principle of the transmission mechanism 19 are described in detail below: The transmission mechanism 19 includes a planetary gear train for speed reduction, which can be single-stage or multi-stage. The planetary gear train converts the output speed of the motor 12 according to a certain transmission ratio to achieve a suitable torque. Simultaneously, the transmission mechanism 19 also includes a shifting assembly to achieve multi-speed output through multiple sets of gears with different transmission ratios.

[0032] like Figures 3-14 As shown, the electric drill 100 also includes a locking mechanism 15 to realize the shaft locking function, which is used to lock the output shaft 14 when the output shaft 14 transmits torque to the motor shaft (not shown in the figure) in the reverse direction; the locking mechanism 15 is connected to the transmission mechanism 19 and the output mechanism 13.

[0033] Understandably, in other alternative embodiments, the transmission mechanism 19 may be omitted. The motor shaft (not shown) directly drives the output mechanism 13. The locking mechanism 15 connects the motor 12 and the output mechanism 13.

[0034] In this embodiment, the locking mechanism 15 includes a shaft lock frame 16, a damping assembly 17, a shaft lock ring 151, and a locking member 154. The shaft lock frame 16 serves as the torque input assembly of the locking mechanism 15, connecting the transmission mechanism 19 and the output mechanism 13. Specifically, the shaft lock frame 16 connects the planetary gear set 191 closest to the output mechanism 13 and the output shaft 14. In this embodiment, the output shaft 14 is rotatably connected to the shaft lock frame 16. It is understood that in other alternative embodiments, other components can be connected to the output shaft 14 to form an output section before connecting it to the shaft lock frame 16. As long as the formed output section rotates synchronously with the output shaft 14, the connection between the formed output section and the shaft lock frame 16, or the direct connection between the output shaft 14 and the shaft lock frame 16, is not a limitation of this application. Similarly, it is understood that other components can be connected to the shaft lock frame 16 to form an input assembly, as long as the formed input assembly rotates synchronously with the shaft lock frame 16, this is not a limitation of this application.

[0035] The output shaft 14 has a first outer peripheral surface 142. The shaft lock 16 includes a first inner surface 1621 that at least partially surrounds the first outer peripheral surface 142; a first gap 1622 is provided between the first inner surface 1621 and the first outer peripheral surface 142. A damping assembly 17 includes a first mounting portion 171, a second mounting portion 172, and a buffer portion 173. The first mounting portion 171 connects to the output shaft 14, the second mounting portion 172 connects to the shaft lock 16, and the buffer portion 173 connects the first mounting portion 171 and the second mounting portion 172. The damping assembly 17 is disposed outside the first gap 1622, meaning that the damping assembly 17 will not be inserted into or embedded within the first gap 1622. At least a portion of the buffer portion 173 extends along a second axis 102. When the output shaft 14 undergoes relative movement with the shaft lock 16, the buffer portion 173 provides a buffering force to delay the movement of the output shaft 14 relative to the shaft lock 16 by undergoing torsional deformation.

[0036] In this embodiment, the shaft locking ring 151 is disposed around the output shaft 14. A locking member 154 is disposed between the shaft locking ring 151 and the output shaft 14, and the locking member 154 has at least a locked position and an unlocked position relative to the shaft locking ring 151. When the output shaft 14 transmits torque in the reverse direction to the motor shaft (not shown), the locking member 154 is in the locked position, locking the rotation of the output shaft 14 relative to the housing 11. When the motor shaft (not shown) transmits torque to the output shaft 14, the locking member 154 is in the unlocked position, releasing the rotation of the output shaft 14. The shaft locking frame 16 also includes or has a switching lever 164 inserted between the shaft locking ring 151 and the locking member 154, which toggles the locking member 154 between the locked and unlocked positions. By configuring a first gap 1622, the shaft locking frame 16 rotates relative to the output shaft 14 within a preset angle α range, thereby driving the locking member 154 to switch between the locked and unlocked positions.

[0037] like Figures 8-9 As shown, during the operation of the power tool, when the output shaft 14 is rotated by the motor shaft in the forward transmission, the output shaft 14 and the shaft lock frame 16 rotate synchronously or substantially synchronously. When the locking member 154 is in the unlocked position, the locking member 154 releases the rotation of the output shaft 14.

[0038] When the speed of motor 12 suddenly changes due to stopping, shifting gears, or braking, the output shaft 14 may rotate faster than the shaft lock frame 16 due to inertia. This can also cause the output shaft 14 to transmit torque in the opposite direction to the motor shaft (not shown in the figure). In this situation, relative movement will occur between the output shaft 14 and the shaft lock frame 16 due to inertia. If the speed of the output shaft 14 is too high and the rotational speed of the output shaft 14 is not buffered in time, the output shaft 14 will collide with the locking mechanism 15 due to inertia.

[0039] The damping assembly 17 provided in this embodiment has a buffer portion 173 extending axially. When the output shaft 14 and the shaft lock frame 16 move relative to each other, the output shaft 14 drives the buffer portion 173 to undergo torsional deformation. At the same time, the buffer portion 173 applies a restoring force to the output shaft 14 to restore its original state. This restoring force buffers the movement of the output shaft 14 relative to the shaft lock frame 16. That is, this restoring force acts as a buffer force, delaying the movement of the output shaft 14 relative to the shaft lock frame 16. Correspondingly, the impact force of the output shaft 14 hitting the locking mechanism 15 will also be reduced to a certain extent, improving the impact problem caused by inertia during braking, and in particular, effectively improving the impact noise problem. At the same time, compared with the prior art, where the damping structure is set within the first gap 1622 or the damping mechanism generates buffering force through linear reciprocating deformation perpendicular to the second axis 102, the damping assembly 17 in this embodiment is set outside the first gap 1622, which does not affect the function of the first gap 1622 or increase its design and assembly difficulty. Meanwhile, there is essentially no force component between the direction of movement of the output shaft 14 and the direction of providing the buffer force; that is, both the output shaft 14 and the buffer part 173 rotate around the second axis 102. Therefore, the buffering efficiency is higher. During the forward transmission process, the locking mechanism 15 does not increase damping and does not affect the overall efficiency because the output shaft 14 and the shaft lock frame 16 move basically synchronously.

[0040] More specifically, the output shaft 14 is formed with or connected to a transmission part 141, which is specifically an external hexagonal part. The first outer peripheral surface 142 is the outer surface of the external hexagonal part.

[0041] The shaft locking ring 151 is fixedly disposed inside the housing 11, meaning that the shaft locking ring 151 and the housing 11 cannot rotate relative to each other. The shaft locking ring 151 is fitted around the output shaft 14, and a first receiving space 152 is formed between the shaft locking ring 151 and the output shaft 14. The locking member 154 is located at the first receiving space 152 formed between the shaft locking ring 151 and the output shaft 14.

[0042] The shaft lock frame 16 includes a main body 161, a planetary gear carrier 163 connecting to the planetary gear set 191, and the aforementioned switching block 164. The switching block 164 and the planetary gear carrier 163 are respectively disposed on both sides of the main body 161. The main body 161 generally has a disc-shaped structure.

[0043] The main body 161 also forms a drive hole 162, into which the transmission part 141 of the output shaft 14 extends. In this embodiment, the transmission part 141 of the output shaft 14 is an external hexagonal part, and the corresponding drive hole 162 is an octagonal hole that allows the transmission part 141 to rotate within the drive hole 162 relative to the shaft lock frame 16 within a preset angle α range. Of course, the specific structure of the drive hole 162 is not limited to this. As long as the structure of the drive hole 162 allows the transmission part 141 to rotate within the drive hole 162 relative to the shaft lock frame 16 within a preset angle α range, it falls within the scope of protection of this invention. In fact, it can be understood that the transmission part 141 of the output shaft 14 is not limited to an external hexagonal part. The transmission part 141 of the output shaft 14 can also be other transmission structures. Correspondingly, the structure of the drive hole 162 only needs to allow the transmission part 141 to rotate within the drive hole 162 relative to the shaft lock frame 16 within a preset angle α range.

[0044] More specifically, the shaft locking ring 151 has a cylindrical surface 153 centered on the second axis 102, and the cylindrical surface 153 surrounds the output shaft 14 to form the aforementioned first accommodating space 152. The outer periphery of the output shaft 14, i.e., the first outer peripheral surface 142, includes a first plane 1421 and a second plane 1422. The first plane 1421 is parallel to the first axis 101, and the second plane 1422 is also parallel to the first axis 101. The first plane 1421 and the second plane 1422 form an external hexagonal surface.

[0045] The locking element 154 is a cylindrical pin, which is disposed between the first plane 1421 and the cylindrical surface 153. In this embodiment, to improve stability, the number of first planes 1421 is three. Correspondingly, the number of cylindrical pins is also three, and the number of switching blocks 164 is also three. The three switching blocks 164 are respectively located between two adjacent cylindrical pins so that the driven cylindrical pins move in the circumferential direction around the second axis 102. When the locking element 154 is located... Figure 9 When the locking element 154 is in the unlocked position shown, it is not in contact with both the cylindrical surface 153 and the first plane 1421 simultaneously. In this position, the shaft lock bracket 16 can drive the output shaft 14 to rotate relative to the housing 11. However, when the locking element 154 is in the unlocked position... Figure 11 and Figure 13 In the locked position, the locking member 154 can simultaneously contact the cylindrical surface 153 and the first plane 1421. At this time, the locking member 154 is locked in the circumferential direction around the first axis 101, and the rotation of the output shaft 14 relative to the housing 11 is locked, that is, the rotation of the output shaft 14 relative to the shaft locking ring 151 is locked. Therefore, the user cannot rotate the output shaft 14 relative to the housing 11 from the side where the output mechanism 13 is located.

[0046] like Figures 8-13As shown, in this embodiment, the inner wall of the octagonal hole of the drive hole 162 is the first inner surface 1621, to ensure that the output shaft 14 can switch between the locked and unlocked positions regardless of whether it rotates clockwise or counterclockwise. The first inner surface 1621 has a first driving surface 1621a and a second driving surface 1621b. Wherein, as... Figures 10-11 As shown, the motor shaft (not shown in the figure) rotates clockwise, which in turn drives the output shaft 14 to rotate clockwise. During sudden braking or gear shifting, the output shaft 14 continues to rotate clockwise due to inertia, allowing the first plane 1421 of the output shaft 14 to contact the first driving surface 1621a. Figure 12 and Figure 13 As shown, the motor shaft (not shown in the figure) rotates counterclockwise, and the shaft lock frame 16 drives the output shaft 14 to rotate counterclockwise. When braking or shifting gears suddenly, the output shaft 14 continues to rotate counterclockwise due to inertia, and the first plane 1421 of the output shaft 14 can contact the second driving surface 1621b.

[0047] like Figure 14 As shown, the first mounting portion 171, the second mounting portion 172, and the buffer portion 173 of the damping assembly 17 are integrally formed components. In other alternative embodiments, the first mounting portion 171, the second mounting portion 172, and the buffer portion 173 can be components that are connected to form a whole. The buffer portion 173 has an elastic structure formed or connected to it. In this embodiment, the damping assembly 17 is made of elastic material.

[0048] The first mounting portion 171 is inserted into the first mounting groove 143, which extends along the second axis 102 from the rear end face of the output shaft 14. In this embodiment, the first mounting portion 171 is located in front of the second mounting portion 172. The first mounting portion 171 includes a first limiting portion 1711, which extends radially along the first axis 101. In this embodiment, the first mounting portion 171 is a rectangular block. The first mounting groove 143 has a first receiving groove that mates with the first limiting portion 1711, and the first receiving groove is a rectangular groove. Through the mate of the first limiting portion 1711 and the first receiving groove, the first mounting portion 171 and the output shaft 14 rotate synchronously, that is, the first limiting portion 1711 and the first receiving groove mutually restrict their circumferential rotational movement. The second mounting portion 172 is fitted into the second mounting groove 165, which is formed on the rear end face of the shaft lock frame 16. The first mounting portion 171 and the second mounting portion 172 are arranged sequentially along the second axis 102. The second mounting portion 172 includes a second limiting portion 1721, which extends radially along the second axis 102. The second mounting groove 165 has a second receiving groove 1651 that mates with the second limiting portion 1721. Through the mate between the second limiting portion 1721 and the second receiving groove 1651, the second mounting portion 172 and the shaft lock frame 16 rotate synchronously, that is, the second limiting portion 1721 and the second receiving groove 1651 mutually restrict their circumferential rotational movement.

[0049] The buffer portion 173 includes a first buffer portion 1731 extending along the second axis 102 and connected to the first mounting portion 171. In this embodiment, the first buffer portion 1731 is cylindrical. It also includes a second buffer portion 1732 extending in a direction perpendicular to the second axis 102 and connected to the second mounting portion 172. In this embodiment, the second buffer portion 1732 is arranged circumferentially around the second axis 102 as a center along the first buffer portion 1731. The second buffer portion 1732 includes a plurality of cylinders with a diameter smaller than that of the first buffer portion 1731. The first buffer portion 1731 and the second buffer portion 1732 are fixedly connected.

[0050] like Figure 15 and Figure 16 As shown, this is a power tool according to the second embodiment of this application, which differs from the first embodiment in that the specific structure of the damping component 27 is different.

[0051] The first mounting portion and the first buffer portion are combined into a first buffer portion 2731, which has a generally V- or U-shaped structure extending along the second axis 202. The first mounting groove 243 is a groove extending along the second axis 202, and the groove width is smaller than the opening width of the first buffer portion at its corresponding position, so that the first buffer portion 2731 abuts against the first mounting groove 243.

[0052] The second buffer portion 2732 is connected to the first buffer portion 2731. The second mounting portion 272 is connected to the second buffer portion 2732. The second mounting portions 272 are symmetrically arranged. Since the first buffer portion 2731 has a generally V- or U-shaped structure extending along the second axis 202, the second mounting portions 272 can elastically deform in the direction perpendicular to the second axis, so that the second mounting portion 272 abuts against the second mounting groove 265.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A power tool, comprising: case; An electric motor, comprising a motor shaft rotatable about a first axis relative to the housing; Output mechanism, used to output torque; The motor drives the output mechanism; the output mechanism includes: an output shaft that can rotate relative to the housing about a second axis, the output shaft having a first outer peripheral surface; A locking mechanism is used to lock the output shaft when the output shaft transmits torque to the motor shaft; Its features are, The locking mechanism includes: A shaft locking bracket is connected to the output shaft to drive the output shaft; the shaft locking bracket includes a first inner surface that surrounds the first outer peripheral surface in a circumferential direction; a first gap is provided between the first inner surface and the first outer peripheral surface. A damping assembly includes a first mounting portion connecting the output shaft, a second mounting portion connecting the shaft lock frame, and a buffer portion connecting the first mounting portion and the second mounting portion; wherein the damping assembly is disposed outside the first gap and at least a portion of the buffer portion extends along the second axis direction; when the output shaft and the shaft lock frame move relative to each other, the buffer portion provides a buffering force to delay the movement of the output shaft relative to the shaft lock frame by undergoing torsional deformation.

2. The power tool according to claim 1, characterized in that, The first mounting part, the second mounting part, and the buffer part are an integral component.

3. The power tool according to claim 1, characterized in that, The locking mechanism also includes, A shaft locking ring is arranged around the output shaft; A locking element is disposed between the shaft locking ring and the output shaft. The locking element has at least a locked position and an unlocked position relative to the shaft locking ring. When the output shaft transmits torque to the motor shaft, the locking element is located in the locked position, and the locking element locks the rotation of the output shaft relative to the housing. When the motor shaft transmits torque to the output shaft, when the locking element is located in the unlocked position, the locking element releases the rotation of the output shaft relative to the housing. The shaft lock frame is also connected to or formed with a switching block inserted between the shaft lock ring and the locking member, the switching block being used to toggle the locking member between the locked position and the unlocked position.

4. The power tool according to claim 3, characterized in that, By configuring the first gap, the shaft lock frame rotates relative to the output shaft within a preset angle range, so that the shaft lock frame drives the locking member to switch between the locked position and the unlocked position.

5. The power tool according to claim 1, characterized in that, The first mounting part rotates synchronously with the output shaft, and the second mounting part rotates synchronously with the shaft locking structure.

6. The power tool according to claim 5, characterized in that, The buffer portion includes a first buffer portion extending along the second axis and connected to the first mounting portion, and a second buffer portion extending along a direction perpendicular to the second axis and connected to the second mounting portion, wherein the first buffer portion and the second buffer portion are fixedly connected.

7. The power tool according to claim 5, characterized in that, The first mounting part and the second mounting part are arranged one after the other along the second axis.

8. The power tool according to claim 1, characterized in that, The buffer section is formed or connected to an elastic structure.

9. A power tool, comprising: case; An electric motor, comprising a motor shaft rotatable about a first axis relative to the housing; An output mechanism is used to receive the torque provided by the motor and output the torque; Includes an output section that can rotate relative to the housing about a second axis; A locking mechanism is provided for locking the output section when the output section transmits torque to the motor shaft; the locking mechanism connects the motor and the output mechanism. Its features are, The locking mechanism includes: An input component receives the torque transmitted by the motor and is connected to the output unit to drive the output unit; A damping assembly connecting the input assembly and the output assembly; the damping assembly includes a buffer portion extending at least partially along a second axis; when the input assembly and the output assembly move synchronously, the buffer portion moves synchronously with both the input assembly and the output assembly; when the input assembly and the output assembly move relative to each other, the buffer portion provides a buffering force to delay the movement of the output assembly relative to the input assembly by undergoing torsional deformation.

10. A power tool, comprising: case; An electric motor, comprising a motor shaft rotatable about a first axis relative to the housing; An output mechanism is used to receive the torque provided by the motor and output the torque; Includes an output shaft that can rotate relative to the housing about a second axis, the output shaft having a first outer peripheral surface; A locking mechanism is used to lock the output shaft when the output shaft transmits torque to the motor shaft; The locking mechanism connects the motor and the output mechanism; Its features are, The locking mechanism includes: A shaft locking bracket is connected to the output shaft to drive the output shaft; the shaft locking bracket includes a first inner surface that at least surrounds a portion of the first outer peripheral surface; a first gap is provided between the first inner surface and the first outer peripheral surface. A damping assembly, disposed outside the first gap, includes an elastic element that provides a buffering force along the rotational direction of the output shaft to delay the movement of the output shaft relative to the shaft lock when the output shaft moves relative to the shaft lock.

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