Electric tool

Abstract

The utility model discloses an electric tool. The electric tool comprises a shell, a rotation driving unit and a braking unit. The housing forms a mounting cavity. The rotation driving unit comprises a rotation driving mechanism and an output shaft, the output shaft is rotatably inserted into the mounting cavity and extends to the outside, the end, extending to the outside, of the output shaft is detachably connected with the screwdriver bit, the end, close to the rotation driving mechanism, of the output shaft forms a moving cavity in the axial direction, and the vent hole is used for communicating the moving cavity with the mounting cavity. The braking unit comprises a clutch mechanism, a braking mechanism and a linkage piece. The rotation driving mechanism can drive the output shaft to rotate through the clutch mechanism, the stopping mechanism comprises a sensing element, a triggering piece and a resetting piece, the triggering piece can be movably inserted into the moving cavity in the axial direction of the output shaft, the sensing element is opposite to one end face of the triggering piece, and the resetting piece is arranged on the other end face of the triggering piece. The trigger piece moves in the axial direction of the output shaft so as to be close to or away from the sensing element, and the reset piece is connected with the trigger piece.

Description

Technical Field

[0001] The utility model relates to the technical field of power mechanical tools, in particular to electric tools. Background Art

[0002] An electric screwdriver is a commonly used power tool used for tightening or loosening screws. It comprises a housing, a drive unit, and a brake unit. The output shaft of the drive unit extends into a mounting slot formed in the housing. The drive member of the drive unit rotates the output shaft via a clutch mechanism provided by the brake unit. This allows the output shaft to drive a fastener into or out of the object being fastened, via a bit mounted in the mounting slot.

[0003] When the fastener is screwed into the object to be fastened, the fastener, through the bit, restricts the output shaft from rotating in the tightening direction, while the driving mechanism continues to operate normally. At this time, the driving speed of the driving mechanism is greater than the output speed of the output shaft. The existing output shaft forms a movable cavity in the axial direction, and the trigger member provided by the braking mechanism of the brake unit is inserted into the movable cavity. When the driving speed of the driving mechanism exceeds the output speed of the output shaft, the extrusion protrusion formed by the clutch mechanism can rotate to face the passive member provided by the clutch mechanism. The extrusion protrusion then pushes the passive member away from the driving mechanism, causing the output shaft and the driving mechanism to lose connection. At this time, the trigger member moves within the movable cavity to trigger the sensing element provided by the braking mechanism. Because the driving member is controllably connected to a control circuit board connected to the sensing element circuit, the trigger member triggers the sensing element to stop the driving mechanism.

[0004] To balance the pressure differential generated by the trigger member's movement within the movable cavity, the output shaft also forms an air vent along its axial direction. This vent vent connects the movable cavity to the assembly slot. However, electric screwdrivers generate a large amount of debris and dust during operation. This debris and dust can easily enter the interior of the electric screwdriver through the assembly slot and the air vent. This debris and dust can damage the internal components of the electric screwdriver, increasing the frequency of repairs and shortening its service life. Utility Model Content

[0005] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides an electric tool, comprising:

[0006] a housing forming a mounting cavity;

[0007] A driving unit, comprising a driving mechanism and an output shaft, wherein the driving mechanism is mounted in the mounting cavity, the output shaft is rotatably inserted in the mounting cavity and extends to the outside, an end portion of the output shaft extending to the outside is detachably connected to a screwdriver bit, the driving mechanism is disposed at an end portion of the output shaft away from the screwdriver bit, an end portion of the output shaft close to the driving mechanism forms a movable cavity in the axial direction, and the output shaft further forms at least one vent hole in the radial direction, the vent hole being used to connect the movable cavity with the mounting cavity;

[0008] a brake unit comprising a clutch mechanism, a braking mechanism and a linkage member; the driving mechanism can drive the output shaft to rotate via the clutch mechanism; the braking mechanism comprises a sensing element, a trigger member and a reset member; the sensing element is electrically connected to a control circuit board that controls the start and stop of the driving mechanism; the trigger member is inserted into the movable cavity so as to be movable along the axial direction of the output shaft; the sensing element is maintained opposite to one side of the trigger member; the trigger member moves along the axial direction of the output shaft to approach or move away from the sensing element; the reset member is connected to the trigger member and is elastically deformed when the trigger member approaches the sensing element; the vent formed on the output shaft is at least partially always located on the side of the trigger member facing away from the sensing element;

[0009] When the resistance encountered by the screwdriver bit exceeds a preset range, the driving speed of the driving mechanism is greater than the output speed of the output shaft, and the clutch mechanism causes the driving mechanism to separate from the output shaft. The clutch mechanism drives the trigger member to move toward the direction close to the sensing element through the linkage member, and the trigger member is configured to be driven by the linkage member to move toward the direction close to the sensing element when the driving mechanism is separated from the output shaft.

[0010] According to an embodiment of the present invention, after the reset member drives the trigger member to reset, an end portion of the trigger member away from the sensing element blocks a portion of the vent hole.

[0011] According to an embodiment of the present invention, after the reset member drives the trigger member to reset, the vent hole formed by the output shaft is entirely located on a side of the trigger member facing away from the sensing element.

[0012] According to one embodiment of the present invention, the driving mechanism includes a driving component and a belt shaft, the driving component includes a driving member and a speed reduction member, the speed reduction member is respectively connected to the driving member and the belt shaft, the driving force generated by the driving member is decelerated by the speed reduction member and transmitted to the belt shaft, and the belt shaft drives the output shaft to rotate through the clutch mechanism.

[0013] According to one embodiment of the present invention, the clutch mechanism includes a clutch component, an elastic component and a clutch disc group, the clutch disc group includes a first clutch disc and a second clutch disc, the first clutch disc is arranged at an end of the output shaft close to the driving mechanism, and the first clutch disc forms at least one socket, the clutch component includes a blocking component and a plug-in component, the blocking component is sleeved on the output shaft and is located on the side of the first clutch disc facing away from the belt shaft, the plug-in component is arranged on the side of the blocking component facing the belt shaft, and the second clutch disc is installed on the belt shaft away from the reduction gear. One end face of the speed member, and the first clutch disc and the second clutch disc remain opposite to each other, the second clutch disc forms an extrusion protrusion toward one end face of the first clutch disc, and a slot is formed between each of the extrusion protrusions and the belt shaft, the connector is movably assembled in the socket and extends into the slot, the elastic member remains in a compressed state and is connected to the blocking assembly, the linkage member is located between the blocking assembly and the trigger member, and the linkage member is configured to drive the trigger member to move toward the direction close to the sensing element when the blocking assembly moves in the direction away from the belt shaft.

[0014] According to an embodiment of the present invention, the connector is implemented as a steel ball, and the connector is rotatably engaged with the socket.

[0015] According to one embodiment of the present utility model, the anti-shifting assembly includes a stop member and a stop member, and the stop member and the stop member are both movably installed on the output shaft, wherein the stop member is located between the first clutch disc and the stop member, and the elastic member is connected to the stop member, and the stop member can prevent the elastic member from rotating due to force.

[0016] According to one embodiment of the present invention, the output shaft is further formed with at least one through hole in the radial direction, and the through hole is used to connect the moving cavity with the installation cavity, the stop member forms an insertion channel and a receiving groove connected to the insertion channel, the output shaft is inserted into the insertion channel formed by the stop member, and the inner diameter of the part of the receiving groove formed by the stop member gradually increases from the end close to the first clutch disc to the end away from the first clutch disc, the trigger member has an abutment portion and a trigger portion, and one end face of the trigger portion extends axially to form the abutment portion, the sensing element is arranged on the side of the trigger portion away from the abutment portion, and the cross-sectional size of the abutment portion in the radial direction gradually decreases from the end close to the trigger portion to the end away from the trigger portion, the linkage member is assembled in the through hole, and the linkage member maintains abutment with the side wall of the receiving groove and the outer peripheral wall of the abutment portion.

[0017] According to an embodiment of the present invention, the trigger member further has a stop portion, and an end surface of the abutment portion away from the trigger portion extends axially to form the stop portion, and part of the linkage member extends between the abutment portion and the stop portion.

[0018] According to one embodiment of the utility model, the electric tool also includes an adjusting mechanism, which includes an adjusting sleeve and a pressure piece. The adjusting sleeve forms an assembly cavity, one end of the shell is inserted into the assembly cavity, and the adjusting sleeve is threadedly connected to the shell. The pressure piece is installed in the assembly cavity and partially extends into the installation cavity, and the end of the pressure piece extending into the installation cavity abuts against the end of the elastic piece away from the anti-rotation piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure shows a schematic structural diagram of the electric tool of the present utility model.

[0020] Figure 2 A cross-sectional view of the electric tool of the present invention is shown at one viewing angle.

[0021] Figure 3 A cross-sectional view of the electric tool of the present invention is shown from another perspective.

[0022] Figure 4 Shown Figure 2 A magnified view of the structure of part A.

[0023] Figure 5 Shown is an exploded view of the structure of part of the electric tool of the present invention.

[0024] Figure 6 Shown Figure 2 A magnified view of the structure of part B.

[0025] Figure 7 Shown Figure 3 Enlarged view of the structure of part C in the middle. DETAILED DESCRIPTION

[0026] The following description is intended to disclose the present invention and enable those skilled in the art to implement the present invention. The preferred embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] refer to Figures 1 to 7 A power tool according to a preferred embodiment of the present invention will be described in detail below. The power tool includes a housing 10 , a driving unit 20 and a braking unit 30 .

[0030] The driving unit 20 includes a driving mechanism 21 and an output shaft 22. The housing 10 forms a mounting cavity 101, and the driving mechanism 21 is mounted in the mounting cavity 101. The output shaft 22 is rotatably inserted in the mounting cavity 101 and extends from the mounting cavity 101 to the outside. One end of the output shaft 22 extending to the outside is detachably connected to a bit, such as a screwdriver, which acts on a fastener, such as a screw. The driving mechanism 21 is arranged at an end of the output shaft 22 away from the bit. An end of the output shaft 22 close to the driving mechanism 21 forms a movable cavity 2201 in the axial direction. The output shaft 22 also forms at least one vent hole 2202 in the radial direction, and the vent hole 2202 is used to connect the movable cavity 2201 with the mounting cavity 101.

[0031] The braking unit 30 includes a clutch mechanism 31, a braking mechanism 32, and a linkage member 33. The driving mechanism 21 can drive the output shaft 22 to rotate via the clutch mechanism 31, so that the output shaft 22 drives the fastener, via the bit, into and out of the object to be fastened. The braking mechanism 32 includes a sensing element 321, a triggering member 322, and a reset member 323. The sensing element 321 is electrically connected to a control circuit board (not shown) that controls the start and stop of the driving mechanism 21. The triggering member 322 is inserted into the movable cavity 2201 and is movable along the axial direction of the output shaft 22. The sensing element 321 and one side of the triggering member 322 are opposed to each other. As the triggering member 322 moves along the axial direction of the output shaft 22, it can move closer to or further away from the sensing element 321. The reset member 323 is connected to the triggering member 322 and elastically deforms when the triggering member 322 approaches the sensing element 321. At least a portion of the vent hole 2202 formed on the output shaft 22 is always located on a side of the trigger member 322 facing away from the sensing element 321 .

[0032] In the initial state, the driving mechanism 21 is connected to the output shaft 22 via the clutch mechanism 31. When the fastener is screwed into the object to be fastened, the resistance experienced by the bit exceeds a preset range. The fastener, through the bit, restricts the output shaft 22 from rotating in the direction driven by the driving mechanism 21 to tighten. The driving mechanism 21 continues to operate, but its rotational speed exceeds the output speed of the output shaft 22. The clutch mechanism 31 then separates the driving mechanism 21 from the output shaft 22. Simultaneously, the clutch mechanism 31, via the linkage member 33, drives the trigger member 322 toward the sensing element 321, causing it to trigger the sensing element 321. The sensing element 321 then controls the driving mechanism 21 to stop operating via the control circuit board. When the resistance experienced by the bit returns to within the preset range, the reset member 323, through its own elastic action, drives the trigger member 322 away from the sensing element 321, facilitating continued use of the power tool.

[0033] In one example, the sensing element 321 is implemented as a Hall element.

[0034] In one embodiment, when the restoring member 323 drives the triggering member 322 to reset, an end of the triggering member 322 away from the sensing element 321 partially blocks the vent hole 2202 .

[0035] As a deformable method, when the reset member 323 drives the trigger member 322 to reset, the vent hole 2202 formed on the output shaft 22 is entirely located on the side of the trigger member 322 facing away from the sensing element 321 .

[0036] Thus, when the trigger member 322 moves within the movable cavity 2201, the air within the movable cavity 2201 flows into the mounting cavity 101 through the vent hole 2202, or the air within the mounting cavity 101 flows into the movable cavity 2201 through the vent hole 2202, thereby balancing the pressure difference within the movable cavity 2201. Since the vent hole 2202 is covered by the housing 10, dust and other debris in the external environment are unlikely to enter the movable cavity 2201 through the vent hole 2202, thereby protecting the internal components of the power tool, extending the service life of the power tool, and reducing the frequency of maintenance of the power tool.

[0037] In one example, the sensing element 321 is implemented as a Hall sensor; and the restoring element 323 is implemented as a spring.

[0038] Specifically, the driving mechanism 21 includes a driving member 211 and a belt shaft 212. The driving member 211 includes a driving element 2111, and the belt shaft 212 is rotatably connected to the driving element 2111. The belt shaft 212 drives the output shaft 22 to rotate through the clutch mechanism 31.

[0039] Preferably, the driving member 211 further includes a speed reducing member 2112. The speed reducing member 2112 is connected to the driving member 2111 and the belt shaft 212 respectively, and the driving force generated by the driving member 2111 is decelerated by the speed reducing member 2112 and then transmitted to the belt shaft 212, so that the belt shaft 212 obtains a larger torque.

[0040] In one example, the speed reduction member 2112 is implemented as a planetary speed reducer; and the driving member 2111 is implemented to include a motor.

[0041] The clutch mechanism 31 includes a clutch component 311, an elastic component 312 and a clutch disc group 313. The clutch disc group 313 includes a first clutch disc 3131 and a second clutch disc 3132. The first clutch disc 3131 is arranged at an end of the output shaft 22 close to the driving mechanism 21, and the first clutch disc 3131 forms at least one socket 313101. The clutch component 311 includes a blocking component 3111 and a connector 3112. The blocking component 3111 is sleeved on the output shaft 22 and is located on the side of the first clutch disc 3131 facing away from the belt shaft 212, and the connector 3112 is arranged on the side of the blocking component 3111 facing the belt shaft 212. The second clutch disc 3132 is mounted on an end face of the belt shaft 212 away from the speed reducer 2112, and the first clutch disc 3131 and the second clutch disc 3132 remain opposite to each other. An extrusion protrusion 31321 is formed on an end face of the second clutch disc 3132 facing the first clutch disc 3131. A slot 21201 is formed between each of the extrusion protrusions 31321 and the belt shaft 212. The connector 3112 is movably assembled in the socket 313101 and extends into the slot 21201. The elastic member 312 remains compressed and connected to the shift-blocking assembly 3111.

[0042] When the resistance encountered by the screwdriver bit is within a preset range, the elastic member 312 drives the resistance assembly 3111 to abut against the first clutch disk 3131. At the same time, the connector 3112 passes through the socket 313101 and extends into the slot 21201, so that the second clutch disk 3132 installed on the rotating shaft 212 is engaged with the connector 3112. In this way, the driving mechanism 21 drives the output shaft 22 to rotate through the clutch mechanism 31, so that the output shaft 22 drives the fastener to be screwed in and out of the object to be fastened through the screwdriver bit.

[0043] The linkage member 33 is located between the blocking assembly 3111 and the trigger member 322. The linkage member 33 is configured to drive the trigger member 322 to move toward the sensing element 321 when the blocking assembly 3111 moves away from the belt shaft 212.

[0044] Specifically, when the resistance encountered by the screwdriver bit exceeds a preset range, the fastener restricts the output shaft 22 from rotating in the direction driven by the driving member 211 through the screwdriver bit; at the same time, the driving member 211 drives the belt shaft 212 to continue rotating. When the belt shaft 212 drives the extrusion protrusion 31321 formed by the second clutch disc 3132 to correspond to the position of the plug-in component 3112, the extrusion protrusion 31321 overcomes the force of the elastic member 312 on the plug-in component 3112 through the anti-shift assembly 3111, and pushes the anti-shift assembly 3111 and the plug-in component 3112 to move simultaneously along the axial direction of the output shaft 22 in a direction away from the belt shaft 212, causing the elastic member 312 to undergo elastic deformation. When the blocking component 3111 moves along the axial direction of the output shaft 22 toward the direction away from the belt shaft 212, the blocking component 3111 drives the trigger component 322 to move along the axial direction of the output shaft 22 toward the direction close to the sensing element 321 through the linkage component 33 and causes the reset component 323 to undergo elastic deformation, so that the trigger component 322 triggers the sensing element 321, and the sensing element 321 controls the driving component 2111 to stop operating.

[0045] When the resistance applied to the screwdriver bit returns to within a preset range, the elastic member 312 drives the blocking component 3111 to move along the axial direction of the output shaft 22 toward the direction close to the belt shaft 212 through its own elastic action, and the blocking component 3111 pushes the connector 3112 into the slot 21201; at the same time, the reset member 323 drives the trigger member 322 to move along the axial direction of the output shaft 22 toward the direction away from the sensing element 321 through its own elastic action, so as to facilitate the subsequent continuation of the power tool.

[0046] In one embodiment, the first clutch disc 3131 is implemented as a flange, which is fixedly sleeved on the output shaft 22 .

[0047] As a deformable embodiment, the first clutch disc 3131 and the output shaft 22 are integrally formed, and the first clutch disc 3131 is formed by a portion of the output shaft 22 extending radially.

[0048] In one embodiment, the connector 3112 is implemented as a pin, and the connector 3112 is installed on an end surface of the blocking assembly 3111 facing the first clutch disc 3131 .

[0049] In another embodiment, the connector 3112 is implemented as a steel ball, and the connector 3112 is rotatably engaged with the insertion hole 313101. When the driving member 211 drives the belt shaft 212 to rotate until the extrusion protrusion 31321 corresponds to the position of the connector 3112, the connector 3112 can convert the sliding friction between the connector 3112 and the extrusion protrusion 31321 into rolling friction. The connector 3112 reduces the friction force during the process of the belt shaft 212 rotating and squeezing the connector 3112 in a rolling manner.

[0050] Preferably, the shift-blocking assembly 3111 includes a stopper 31111 and a rotation-stopping member 31112. Both the stopper 31111 and the rotation-stopping member 31112 are movably mounted on the output shaft 22, wherein the stopper 31111 is located between the first clutch disc 3131 and the rotation-stopping member 31112, and the elastic member 312 is connected to the rotation-stopping member 31112, and the rotation-stopping member 31112 can prevent the elastic member 312 from rotating due to a force applied thereto.

[0051] In one example, the rotation stop 31112 is implemented as a bearing.

[0052] Preferably, the output shaft 22 further defines at least one through-hole 2203 in the radial direction. The through-hole 2203 is used to connect the movable cavity 2201 with the mounting cavity 101. The stopper 31111 defines an insertion channel 3111101 and a receiving groove 3111102 connected to the insertion channel 3111101. The output shaft 22 is inserted into the insertion channel 3111101 formed by the stopper 31111. The inner diameter of the portion of the stopper 31111 forming the receiving groove 3111102 gradually increases from the end proximal to the first clutch disc 3131 to the end distal to the first clutch disc 3131. The trigger member 322 includes an abutment portion 3221 and a trigger portion 3222. One end surface of the trigger portion 3222 extends axially to form the abutment portion 3221. The sensing element 321 is disposed on a side of the trigger portion 3222 away from the abutting portion 3221. The radial cross-sectional dimension of the abutting portion 3221 gradually decreases from the end closest to the trigger portion 3222 to the end further away from the trigger portion 3222. The linkage member 33 is assembled in the through hole 2203 and maintains abutment with the sidewalls of the accommodating groove 3111102 and the outer peripheral wall of the abutting portion 3221.

[0053] In this way, when the blocking component 3111 and the connector 3112 move simultaneously along the axial direction of the output shaft 22 in the direction away from the belt shaft 212, the side wall of the accommodating groove 3111102 squeezes the linkage member 33, so that the linkage member 33 moves through the through hole 2203 in the direction of extending into the movable cavity 2201, and then the linkage member 33 squeezes the abutment portion 3221, so that the trigger member 322 moves in the direction close to the sensing element 321.

[0054] Preferably, the trigger member 322 further comprises a stopper 3223 , wherein one end surface of the abutting portion 3221 away from the triggering portion 3222 extends axially to form the stopper 3223 , and one end of the linkage member 33 extends between the abutting portion 3221 and the stopper 3223 .

[0055] Furthermore, the electric tool further includes an adjustment mechanism 40 .

[0056] The adjustment mechanism 40 includes an adjustment sleeve 41 and a pressure member 42. The adjustment sleeve 41 forms an assembly cavity 4101. One end of the housing 10 is inserted into the assembly cavity 4101, and the adjustment sleeve 41 is threadedly connected to the housing 10. The pressure member 42 is installed in the assembly cavity 4101 and partially extends into the installation cavity 101. The end of the pressure member 42 extending into the installation cavity 101 abuts against the end of the elastic member 312 away from the rotation-stopping member 31112. By rotating the adjustment sleeve 41, the adjustment sleeve 41 can drive the pressure member 42 to move axially along the output shaft 22 to squeeze or release the pressure on the elastic member 312.

[0057] That is, when the adjusting sleeve 41 is rotated toward tightening with the housing 10, the adjusting sleeve 41 pushes the pressure member 42 toward squeezing the elastic member 312, thereby increasing the force exerted by the elastic member 312 on the anti-displacement assembly 3111 toward the first clutch disk 3131, thereby increasing the resistance to be overcome when the second clutch disk 3132 is separated from the connector 3112 plugged into the first clutch disk 3131. When the adjusting sleeve 41 is rotated toward loosening from the housing 10, the squeezing force exerted by the adjusting mechanism 40 on the elastic member 312 is reduced, thereby reducing the force exerted by the elastic member 312 on the anti-displacement assembly 3111 toward the first clutch disk 3131, thereby reducing the resistance to be overcome when the second clutch disk 3132 is separated from the connector 3112 plugged into the first clutch disk 3131.

[0058] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are provided for illustrative purposes only and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. An electric tool, characterized in that The electric tool comprises: a housing forming a mounting cavity; A driving unit, comprising a driving mechanism and an output shaft, wherein the driving mechanism is mounted in the mounting cavity, the output shaft is rotatably inserted in the mounting cavity and extends to the outside, an end portion of the output shaft extending to the outside is detachably connected to a screwdriver bit, the driving mechanism is disposed at an end portion of the output shaft away from the screwdriver bit, an end portion of the output shaft close to the driving mechanism forms a movable cavity in the axial direction, and the output shaft further forms at least one vent hole in the radial direction, the vent hole being used to connect the movable cavity with the mounting cavity; a brake unit comprising a clutch mechanism, a braking mechanism and a linkage member; the driving mechanism can drive the output shaft to rotate via the clutch mechanism; the braking mechanism comprises a sensing element, a trigger member and a reset member; the sensing element is electrically connected to a control circuit board that controls the start and stop of the driving mechanism; the trigger member is inserted into the movable cavity so as to be movable along the axial direction of the output shaft; the sensing element is maintained opposite to one side of the trigger member; the trigger member moves along the axial direction of the output shaft to approach or move away from the sensing element; the reset member is connected to the trigger member and is elastically deformed when the trigger member approaches the sensing element; the vent formed on the output shaft is at least partially always located on the side of the trigger member facing away from the sensing element; When the resistance encountered by the screwdriver bit exceeds a preset range, the driving speed of the driving mechanism is greater than the output speed of the output shaft, and the clutch mechanism causes the driving mechanism to separate from the output shaft. The clutch mechanism drives the trigger member to move toward the direction close to the sensing element through the linkage member, and the trigger member is configured to be driven by the linkage member to move toward the direction close to the sensing element when the driving mechanism is separated from the output shaft.

2. The electric tool according to claim 1, characterized in that: When the reset member drives the trigger member to reset, the end of the trigger member away from the sensing element blocks a portion of the vent hole.

3. The electric tool according to claim 1, wherein: When the reset member drives the trigger member to reset, the vent hole formed by the output shaft is entirely located on a side of the trigger member facing away from the sensing element.

4. The electric tool according to claim 2 or 3, characterized in that: The driving mechanism includes a driving component and a belt shaft, and the driving component includes a driving part and a speed reduction part. The speed reduction part is connected to the driving part and the belt shaft respectively. The driving force generated by the driving part is decelerated by the speed reduction part and transmitted to the belt shaft. The belt shaft drives the output shaft to rotate through the clutch mechanism.

5. The electric tool according to claim 4, characterized in that: The clutch mechanism includes a clutch component, an elastic component and a clutch disc group, the clutch disc group includes a first clutch disc and a second clutch disc, the first clutch disc is arranged at an end of the output shaft close to the driving mechanism, and the first clutch disc forms at least one socket, the clutch component includes a blocking component and a plug-in component, the blocking component is sleeved on the output shaft and is located on the side of the first clutch disc facing away from the belt shaft, the plug-in component is arranged on the side of the blocking component facing the belt shaft, and the second clutch disc is installed on an end face of the belt shaft away from the speed reducer. , and the first clutch disc and the second clutch disc remain opposite to each other, and the second clutch disc forms an extrusion protrusion on one end face facing the first clutch disc, and a slot is formed between each extrusion protrusion and the belt shaft, and the connector is movably assembled in the socket and extends into the slot, the elastic member remains in a compressed state and is connected to the blocking assembly, the linkage member is located between the blocking assembly and the trigger member, and the linkage member is configured to drive the trigger member to move toward the direction close to the sensing element when the blocking assembly moves in the direction away from the belt shaft.

6. The electric tool according to claim 5, characterized in that: The plug-in connector is implemented as a steel ball and is rotatably engaged with the insertion hole.

7. The electric tool according to claim 6, characterized in that: The anti-shifting assembly includes a stop member and a rotation stop member, both of which are movably installed on the output shaft, wherein the stop member is located between the first clutch disc and the rotation stop member, and the elastic member is connected to the rotation stop member, and the rotation stop member can prevent the elastic member from rotating due to force.

8. The electric tool according to claim 7, characterized in that: The output shaft is further formed with at least one through hole in the radial direction, and the through hole is used to connect the moving cavity with the mounting cavity, the stopper forms an insertion channel and a receiving groove connected to the insertion channel, the output shaft is inserted into the insertion channel formed by the stopper, and the inner diameter of the part of the receiving groove formed by the stopper gradually increases from the end close to the first clutch disc to the end away from the first clutch disc, the triggering member has an abutting portion and a triggering portion, and one end face of the triggering portion extends axially to form the abutting portion, the sensing element is arranged on the side of the triggering portion away from the abutting portion, and the cross-sectional size of the abutting portion in the radial direction gradually decreases from the end close to the triggering portion to the end away from the triggering portion, the linkage member is assembled in the through hole, and the linkage member maintains abutment with the side wall of the receiving groove and the outer peripheral wall of the abutting portion.

9. The electric tool according to claim 8, characterized in that: The triggering member further comprises a stop portion, an end surface of the abutting portion away from the triggering portion extends axially to form the stop portion, and a portion of the linkage member extends between the abutting portion and the stop portion.

10. The electric tool according to claim 9, characterized in that: The electric tool also includes an adjusting mechanism, which includes an adjusting sleeve and a pressure piece. The adjusting sleeve forms an assembly cavity, one end of the shell is inserted into the assembly cavity, and the adjusting sleeve is threadedly connected to the shell. The pressure piece is installed in the assembly cavity and partially extends into the installation cavity. The end of the pressure piece extending into the installation cavity abuts against the end of the elastic piece away from the anti-rotation piece.

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