Electric tool

Abstract

The utility model relates to an electric tool. The electric tool is provided with a main body part and a handle part, the motor is accommodated in the main body part for generating rotation power; the switch trigger is arranged on the handle part and used for controlling the motor; the output shaft axially extends along the main body part; the transmission assembly comprises a gearbox shell and a gear assembly rotationally connected with the motor. The torque clutch mechanism is connected with the gear assembly and comprises a tripping piece capable of moving in the axial direction of the output shaft. The control assembly is configured to control the motor to stop rotating in response to the axial movement of the tripping piece; the control assembly comprises a signal generating unit connected with the tripping piece and a signal receiving unit arranged opposite to the signal generating unit; the signal generating unit is driven by the tripping piece to generate a magnetic field change signal, the signal receiving unit receives the magnetic field change signal and converts the magnetic field change signal into a corresponding voltage change signal, and the control assembly responds to the voltage change signal to control the motor to stop rotating, so that the electric tool is low in noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tools, in particular to an electric tool. BACKGROUND

[0002] The existing electric tools, such as straight handle electric screwdrivers or electric drills with screwdriver functions, are generally provided with a jump-out structure, which is used to disconnect the output path of the motor and the output end when the load exceeds the torque value set by the electric tool during screwing, so as to disconnect the torque output, so that the torque output by the electric tool remains constant, thereby preventing the workpiece surface from being damaged when the screw is screwed in. Although the output path is disconnected in this process, the motor is still rotating, and the jump-out structure will generate excessive noise, so the motor needs to be turned off after the jump-out to reduce the noise.

[0003] The existing screwdrivers on the market have a micro switch added in the body to reduce noise. The micro switch is in a closed state under normal working conditions, and when the trip jump-out occurs, the jump-out piece moves to cause the micro switch to be disconnected, thereby controlling the motor to stop rotating. The frequent closing and opening of the micro switch can easily cause wear and tear, affecting the service life of the tool, and the space required for setting the micro switch is large, resulting in a larger tool size.

[0004] The existing straight handle electric screwdrivers have the characteristics of small size and light weight, but the motor power is small, the rotating speed is low, and the output torque is generally small. The screwdriver tool with an output torque of less than 10 Nm is only suitable for some light working conditions.

[0005] Some known multifunctional electric drills have different functions of drilling, impact, and screwdriver, and have multiple functions and conversion mechanisms integrated in the body. The tool is large in size and heavy in weight, and is difficult to operate. The development trend of the current electric drill products is miniaturization design, and the operation and carrying are more convenient. The internal structure of the body is more compact, so the available space in the body is smaller. If a new function of turning off the motor after the jump-out is added, functional components will be increased, and it is a challenge to reasonably arrange each component in the narrow internal space.

[0006] In view of the working conditions of daily professional kitchen utensils and cabinet assembly, it is an urgent need to provide an electric tool that can output sufficient torque, has low noise, and is easy to operate. INVENTION CONTENTS

[0007] Therefore, the purpose of the present application is to provide an electric tool to solve the noise problem caused by the jump-out trip, thereby improving the user's operation experience.

[0008] An embodiment provided by the application is an electric tool, comprising a housing, a main body part, and a handle part arranged at an angle with the main body part; a motor accommodated in the main body part for generating rotary power; a switch trigger arranged in the handle part and operable for controlling the motor; an output shaft extending axially along the main body part; a transmission assembly comprising a gear box shell and a gear assembly rotationally connected with the motor; a torque clutch mechanism connected with the gear assembly for selectively outputting torque to the output shaft; the torque clutch mechanism comprising a tripping part axially movable along the output shaft; and a control assembly configured to control the motor to stop rotating in response to the axial movement of the tripping part; the control assembly comprising a signal generating unit connected with the tripping part, and a signal receiving unit arranged opposite to the signal generating unit; the signal generating unit is driven by the tripping part to generate a magnetic field change signal, the signal receiving unit receives the magnetic field change signal and converts it into a corresponding voltage change signal, and the control assembly controls the motor to stop rotating in response to the voltage change signal.

[0009] The embodiment has the beneficial effects that the signal generating unit generates a magnetic field change signal, the signal receiving unit receives the magnetic field change signal and converts it into a corresponding voltage change signal, a separate sealed space does not need to be arranged for the signal generating unit to enclose the signal receiving unit, the structure is compact and the overall size is small. The control assembly controls the motor to stop rotating in response to the voltage change signal, and the noise generated by the tripping of the clutch mechanism can be eliminated.

[0010] In an embodiment, the signal generating unit comprises a magnet and a mounting seat for fixing the magnet, and the mounting seat is made of non-magnetic material. The embodiment has the beneficial effects that the combination of the magnet and the Hall sensor is not easily affected by dust and has a long service life. The mounting seat is made of non-magnetic material, and the magnetic field signal of the magnet is not affected.

[0011] In an embodiment, the distance between the magnet and the nearest outer surface of the housing is not less than 3 mm. The embodiment has the beneficial effects that the sufficient distance prevents the magnet from attracting iron filings.

[0012] In an embodiment, the housing or the gear box shell is provided with a guide part, and the signal generating unit is slidably supported on the guide part. The embodiment has the beneficial effects that the movement of the signal generating device is not easily deviated.

[0013] In an embodiment, the control assembly comprises a main control board electrically connected with the signal receiving unit, and the main control board is arranged axially along the output shaft between the signal receiving unit and the switch trigger. The embodiment has the beneficial effects that the structure design is more compact.

[0014] In an embodiment, the tripping part comprises a base part arranged on the gear box shell, and an extension part extended from the base part, and the base part and the extension part are integrally formed. The embodiment has the advantages of good integrity and compact structure.

[0015] In an embodiment, the handle part is provided with a control part for controlling the rotating direction of the motor, the extension part is provided with a matching end, and the signal generating unit is connected to the matching end and located in the space above the control part. The embodiment has the advantages of same movement state of the tripping part and the signal generating unit, and compact structure.

[0016] In an embodiment, the shell comprises a pair of half shells, the connecting surface of the half shells is defined as the central section of the shell, and the signal generating unit and the signal receiving unit are arranged at positions orthogonal to the central section. The embodiment has the advantages of compact structure and small tool volume.

[0017] In an embodiment, the gear assembly is arranged as a three-stage planetary gear, and the projection of the tripping part and the switch trigger on a plane parallel to the axial direction of the output shaft at least partially overlaps. The embodiment has the advantages of three-stage planetary gear of the transmission assembly, and the ability to meet the demand for output torque under different working conditions.

[0018] In an embodiment, the gear assembly comprises an inner gear ring arranged close to the output shaft, the torque clutch mechanism comprises a boss arranged on the inner gear ring and a rolling part abutting against the boss, one side of the tripping part abuts against the rolling part, and the other side abuts against an elastic part, and when the tripping part moves along the axial direction of the output shaft against the force of the elastic part, the output shaft interrupts the torque output. The embodiment has the advantages of stable and reliable tripping of the torque clutch mechanism, and compact structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a sectional view of an electric tool in an embodiment of the present application.

[0020] Figure 2 is Figure 1 is a perspective view of part of the core structure of the electric tool.

[0021] Figure 3 is Figure 2 is a sectional view of the core structure.

[0022] Figure 4 is Figure 3 is a perspective view of the tripping part.

[0023] Figure 5 is Figure 4 is a connection diagram of the tripping part and the signal generating unit in the embodiment.

[0024] Figure 6 is Figure 1 is a schematic view of the inside structure of the outer shell.

[0025] Figure 7 is a schematic view of the structure of the main part of the movement in the front direction.

[0026] Figure 8 is Figure 7 is a schematic view of the tripping member.

[0027] Figure 9 is Figure 7 is a schematic view of the signal generating unit.

[0028] Figure 10 is Figure 7 is a schematic view of the assembly of the tripping member and the signal generating unit.

[0029] Figure 11 is a schematic view of the structure of the main part of the movement in the front direction.

[0030] Figure 12 is Figure 11 is a schematic view of the assembly of the tripping member and the signal generating unit.

[0031] Figure 13 is Figure 11 is a schematic view of the structure of the main part of the movement in the bottom direction.

[0032] Marking Description:

[0033] 10 - main housing; 100 - screwdriver; 112 - guide groove; 114 - positioning groove; 12 - motor; 13 - torsion cover; 130 - output shaft; 14 - transmission assembly; 140 - gear box housing; 140a - guide part; 141 - planetary gear train; 145 - inner gear ring; 145a - boss; 15 - torque clutch mechanism; 150 - tripping member; 151 - base part; 152 - extension part; 152a - fitting end; 153 - elastic member; 154 - rolling member; 16 - control assembly; 161 - signal generating unit; 1611 - magnet; 161b - mounting groove; 161c - mounting hole; 1612 - mounting seat; 162 - signal receiving unit; 20 - handle housing; 22 - switch; 24 - switch trigger; 25 - control member; 250 - tripping member; 251 - base part; 252 - extension part; 252a - fitting end; 261 - signal generating unit; 2611 - magnet; 2612 - mounting seat; 261c - center through hole; 261d - base; 261e - extension arm; 261f - side arm; 261g - boss; 262 - signal receiving unit; 30 - battery pack; 350 - tripping member; 361 - signal generating unit; 3611 - magnet; 3612 - mounting seat. DETAILED DESCRIPTION

[0034] For the purpose of making the objects, technical solutions and advantages of the present application clearer, the present application will be further described in details below with reference to the embodiments and the accompanying drawings.

[0035] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present application pertains. The terms "first", "second" and similar terms used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "comprising" or "including" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connected" or "linked" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, which can change accordingly when the absolute positions of the described objects change.

[0036] In the following description, details are set forth in order to provide a thorough understanding of the present application, but the present application is not limited to the specific embodiments disclosed below.

[0037] One embodiment provided by the present application is an electric tool, as shown in Figure 1 , Figure 6 A gun-type electric drill 100 is provided, which has a housing including a main housing 10 and a handle housing 20 arranged at an angle with the main housing 10. The main housing 10 defines a first axis X extending longitudinally, and the handle housing 20 defines a second axis Y extending obliquely. The included angle β between the first axis X and the second axis Y is set to an obtuse angle, preferably greater than 90 degrees and less than 120 degrees. Such an angle β provides a comfortable holding feeling and operation experience, and is more in line with man-machine. The housing of the electric drill 100 includes two half housings connected together by fasteners. The main housing 10 accommodates a motor 12 and a transmission assembly 14 rotatably connected with the motor 12. The motor 12 is used to generate rotary power, and the transmission assembly 14 includes a gear assembly and a gear box housing 140 accommodating at least part of the gear assembly. The gear assembly adopts a three-stage planetary gear train 141, and the motor 12 adopts a brushless motor with a maximum power of not less than 400W and a maximum output speed of not less than 1000rpm. Through the speed reduction transmission of the planetary gear train 141, the maximum output torque of the electric drill is not less than 30Nm, which can meet the torque demand under different working conditions, such as drilling or screwing on the surface of workpieces made of metal, plastic, wood, etc.

[0038] Referring to Figure 2、 Figure 3 As shown, in an embodiment, a torque clutch mechanism 15 is arranged between the three-stage planetary gear train 141 and the output shaft 130 for selectively outputting torque to the output shaft 130. The last stage planetary gear train has an inner ring gear 145 exposed outside the gear box housing, the torque clutch mechanism 15 includes a plurality of bosses 145a arranged on the inner ring gear 145, the bosses 145a are arranged on the end side close to the output shaft 130 and are uniformly distributed along the circumference of the inner ring gear 145. The torque clutch mechanism 15 includes a plurality of rolling elements 154 abutting against the bosses 145a, the rolling elements 154 are engaged between two adjacent bosses 145a; further includes a trip element 150 abutting against the rolling elements 154, a plurality of elastic elements 153 elastically abutting against the trip element 150, and a torque cover 13 for operatively adjusting the output torque. The torque cover 13 is rotatably arranged around the first axis X for driving the threaded sleeve 17 threadedly engaged therewith, the threaded sleeve 17 is slidably sleeved on the gear box housing 140 and has an outer thread arranged on the outer surface thereof, the torque cover 13 is arranged with an outer thread, when the torque cover 13 is rotated, the threaded sleeve 17 is axially moved along the first axis X. One end of the elastic element 153 abuts against the threaded sleeve 17, and the other end abuts against the trip element 150, when the threaded sleeve 17 is axially moved towards the motor 12 along the first axis X, the elastic element 153 is compressed or stretched, and the abutting pressure of the elastic element 153 against the trip element 150 is correspondingly changed. Rotating the torque cover 13 can be used to set the output torque of the output shaft 130. When the external load applied to the output shaft 130 is less than the output torque of the output shaft 130, the torque clutch mechanism 15 is in engagement state, i.e. the rolling elements 154 are engaged with the inner ring gear bosses 145a, and the two are relatively fixed under the action of the elastic element 153, the inner ring gear 145 does not rotate relative to the gear box housing 140, and the output shaft 130 can output torque. When the external torque applied to the output shaft 130 is greater than or equal to the output torque set by the torque cover 13, the output shaft 130 will transmit the external load to the inner ring gear 145, so that the inner ring gear overcomes the action of the elastic element 153 to rotate, the inner ring gear bosses 145a slip relative to the rolling elements 154 and are in a tripped state, the trip element 150 moves axially along the first axis X under the action of the elastic element 152. Once the inner ring gear 145 rotates, the path of the output torque of the output shaft 130 is cut off, and the output shaft 130 interrupts torque output. In an embodiment, the elastic element 152 is selected to be a compression spring. Figure 3 The arrow M shown in the middle indicates the axial movement of the trip element 150. Once the inner ring gear 145 rotates, the path of the output torque of the output shaft 130 is cut off, and the output shaft 130 interrupts torque output. In an embodiment, the elastic element 152 is selected to be a compression spring.

[0039] In one embodiment, the main housing 10 forms a main body of the electric drill, the handle housing 20 forms a handle for holding, and the handle housing 20 is provided with a switch 22. The handle is provided with a switch trigger 24 electrically connected to the switch 22, and the switch trigger 24 is operable to control the start and stop of the motor. The end of the handle is provided with a battery pack mounting portion, and the battery pack 30 is removably connected to the battery pack mounting portion to provide power for the rotation of the motor 12. The switch trigger 24 can move along the axial direction of the main housing 10 between an initial position and a trigger position. When the switch trigger 24 moves to the trigger position, the motor 12 is started to output rotary power. A control member 25 is provided above the switch trigger 24 for controlling the forward or reverse rotation of the motor 12.

[0040] Further referring to Figure 1 、 Figure 2 and Figure 3 , the control assembly 10 is configured to control the motor 12 to stop rotating in response to the axial movement of the tripping member 150. In one embodiment, the control assembly 10 includes a signal generating unit, a signal receiving unit 162, and a main control board 164 electrically connected to the signal receiving unit 162. The signal generating unit 161 and the signal receiving unit 162 are arranged in direct opposition and non-contact, and there is no obstruction between the signal generating unit 161 and the signal receiving unit 162. The main control board 164 extends above the control member 25 along the axial direction of the main housing 10. In the present application, the extension direction of the main control board 164 is inclined at an angle relative to the first axis X, and the inclination angle is within 30 degrees. The connecting plane of the two half housings is defined as the central cross section of the housing, and the control assembly 10 is arranged at a position intersecting the central cross section, wherein the signal generating unit and the signal receiving unit are arranged at a position orthogonal to the central cross section, that is, the signal generating unit 161 and the signal receiving unit 162 are centrally arranged in the housing space above the handle. The control assembly 10 fully utilizes the internal space between the main housing 10 and the handle housing 20, thereby making the internal layout of the housing more compact.

[0041] Referring to Figures 3 to 5As shown, in an embodiment, the tripping piece 150 includes a base body 151 sleeved on the gear box shell 140, and an extension 152 extended from the base body 151, the extension 152 is located in the main body space above the gear box shell 140 and above the switch trigger 24; the extension 152 is provided with a connecting end 152a extending perpendicular to the first axis X, and the signal generating unit 161 is connected to the connecting end 152a and located in the main shell space above the control piece 24. Since the rolling piece 154 and the tripping piece 150 are in constant pressure and friction, the rolling piece 154 is provided as a steel ball, and the tripping piece 150 is made of a metal material through a stamping and bending processing technology. The base body 151 and the extension 152 of the tripping piece 150 are integrally formed, the connection is reliable, and the rolling piece 154 can also be replaced by other forms such as a needle. The tripping piece 150 is arranged in this way, which makes full use of the available space in the main body, has a compact structure, good integrity and convenient installation.

[0042] In an embodiment, the signal generating unit 161 includes a magnet 1611 and a mounting seat 1612 for fixing the magnet 1611. In order not to affect the magnetic field signal of the magnet, the mounting seat 1612 is made of a non-magnetic material. The distance from the nearest outer surface of the shell to the magnet 1611 is not less than 3mm, which provides sufficient distance to prevent the magnet from attracting iron filings. The mounting seat 1612 is generally rectangular, and a receiving groove 161b is arranged at the center position, and the magnet 1611 is fixedly arranged in the receiving groove 161b. In addition, the mounting seat 1612 is provided with a mounting hole 161c for connecting with the connecting end 152a of the tripping piece. When the torque clutch mechanism 15 is tripped, the tripping piece 150 moves along the direction of the arrow M to drive the signal generating unit 161 to move to generate a magnetic field change signal. Figure 3 The signal receiving unit 162 is used to receive the magnetic field change signal and convert it into a corresponding voltage change signal, and the main control board 164 responds to the voltage change signal to control the motor 12 to stop rotating. In an embodiment, the signal receiving unit 162 adopts a Hall sensor to receive the magnetic field change signal generated by the movement of the magnet 1611, and the overall size of the mounting seat 1612 is suitable for the internal space of the shell, and the structure is compact. The signal generating unit 161 and the signal receiving unit 162 are arranged in a non-contact manner, which avoids the problem of mechanical failure of the switch caused by wear caused by contact. The changing magnetic field is used to transmit the signal, which is less affected by dust, so that the service life of the structure is improved.

[0043] Referring to Figure 6As shown, in an embodiment, the inner surface of the shell is respectively provided with a guide groove 112 and a positioning groove 114. The guide groove 112 provides guidance for the axial movement of the mounting seat 1612 therein, and the guide groove 112 is matched with the shape of the mounting seat 1612. The groove bottom of the guide groove 112 is provided with a plurality of rib plates for supporting the axial movement of the mounting seat 1612 in the guide groove 112, so that the signal generating unit 161 is not easy to deviate when moving. The positioning groove 114 is used to install and fix the signal receiving unit 162, so that the position of the signal receiving unit 162 is stable and reliable, thereby improving the accuracy of detecting the magnetic field change signal.

[0044] Referring to Figure 7 , Figure 8 As shown, it is a simple deformation of an embodiment, and the same structure is not repeated. The difference includes the setting form of the tripping piece 250 and the matching mode of the signal generating unit 261. The extension part 252 of the tripping piece 250 is bent and extended from the lower end of the base part 251 below the gear box shell 140. Specifically, the base part 251 is first stretched parallel to the first axis X, then bent towards the handle part, and finally a parallel extension matching end 252a is formed at the bending part. The matching end 252a includes a pair of oppositely arranged arc-shaped clamping arms. The signal receiving unit 262 is directly opposite to the signal generating unit 261 without contact.

[0045] Referring to Figure 9 , Figure 10 As shown, the signal generating unit 261 includes a mounting seat 2612 and a magnet 2611 arranged on the mounting seat 2612. The mounting seat 2612 includes a disc-shaped base 261d, a disc-shaped boss 261g extending upward from the base 261d, and the outer diameter of the boss 261g is smaller than that of the base 261d. The boss 261g and the base 261d are concentrically arranged and provided with a center through hole 261c, and the magnet 2611 is arranged in the center through hole 261c. The boss 261g is provided with an extension arm 261e on one side, and the base 261d and the extension arm 261e are connected by a side arm 261f. A pair of arc-shaped clamping arms 252a of the matching end 252a are clamped on the edge of the boss 261g. Such arrangement makes the mounting seat 2612 move with the tripping piece 250 in the shell, without the need for the shell to provide support or guidance, thereby reducing the friction with the shell; and the size of the mounting seat 2612 is small, and the assembly difficulty is low.

[0046] Referring to Figure 11 , Figure 12As shown, another simple modification of an embodiment is shown, wherein the same structure is not repeated numbering and elaborated, the difference includes the form of the setting of the tripping piece 350 and the way of the signal generating unit 261. The extension part 252 of the tripping piece 350 extends from the lower end of the base part 351 to the lower part of the gear box shell 140 in parallel with the first axis X, and is set as a matching end 352a at the extension end. The matching end 352a is set as a protrusion. The signal generating unit 361 includes a mounting seat 3612, and a magnet 3611 arranged on the mounting seat 3612. The mounting seat 3612 is correspondingly provided with a recess matched with the shape of the protrusion. Through the shape matching of the protrusion and the recess, the tripping piece 350 drives the signal generating unit 361 to move synchronously along the first axis X.

[0047] As shown, Figure 13 The gear box shell 140 is formed with oppositely arranged guide parts 140a, and the mounting seat 3612 is movably supported on the guide parts 140a. The guide parts 140a make the movement of the signal generating unit 361 not easy to deviate and the structure compact. When the tripping piece 350 moves along the first axis, the signal generating unit 361 is driven to move synchronously to generate a magnetic field change signal. The signal receiving unit receives the magnetic field change signal and converts it into a corresponding voltage change signal. The main control board 164 responds to the voltage change signal to control the motor 12 to stop rotating.

[0048] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in a different order than those described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order to achieve the desired results.

[0049] Those skilled in the art will understand that the above discussion of any of the embodiments is merely exemplary and is not intended to be limiting of the scope of the application, including claims, which are intended to cover all alternatives, modifications, and variations falling within the scope of the appended claims. The above-described features of the present application can be combined in any manner within the scope of the application, and the steps can be performed in any order within the scope of the application, and there are many other variations of the application as described above, which will be apparent to those having ordinary skill in the art. For the sake of brevity, the disclosures of the prior art are incorporated herein by reference in their entirety.

[0050] The embodiments of the present application are intended to cover all such alternatives, modifications, and variations as falling within the scope of the appended claims. Accordingly, any one of the steps of the application can be performed in any order, and the like, as is meant for brevity.

Claims

1. A power tool, characterized in that, include: The outer casing includes a main body and a handle portion that is angled relative to the main body; An electric motor, housed in the main body, is used to generate rotational power; A switch trigger, located on the handle portion, is operable for controlling the motor; The output shaft extends axially along the main body. The transmission assembly includes a gearbox housing and a gear assembly rotatably connected to the motor; A torque clutch mechanism, connected to the gear assembly, is used to selectively output torque to the output shaft; the torque clutch mechanism includes a release element movable axially along the output shaft. The control component is configured to control the motor to stop rotating in response to axial movement of the trip member; the control component includes a signal generating unit connected to the trip member and a signal receiving unit disposed opposite to the signal generating unit; the signal generating unit is driven by the trip member to generate a magnetic field change signal, the signal receiving unit receives the magnetic field change signal and converts it into a corresponding voltage change signal, and the control component controls the motor to stop rotating in response to the voltage change signal.

2. The power tool according to claim 1, characterized in that, The signal generating unit includes a magnet and a mounting base for fixing the magnet, and the signal receiving unit includes a Hall sensor; the mounting base is made of a non-magnetic material.

3. The power tool according to claim 2, characterized in that, The distance between the magnet and the nearest outer surface of the outer casing is not less than 3 mm.

4. The power tool according to claim 1, characterized in that, The outer casing or gearbox housing is provided with a guide portion, and the signal generating unit is slidably supported on the guide portion.

5. The power tool according to claim 1, characterized in that, The control component includes a main control board electrically connected to the signal receiving unit, which is positioned horizontally between the signal receiving unit and the switch trigger along the output shaft axis.

6. The power tool according to claim 1, characterized in that, The tripping component includes a base portion disposed on the gearbox housing and an extension portion extending from the base portion, the base portion and the extension portion being integrally formed.

7. The power tool according to claim 6, characterized in that, The handle portion is provided with a control component for controlling the rotation direction of the motor, the extension portion is provided with a mating end, and the signal generating unit is connected to the mating end and located in the space of the main body portion above the control component.

8. The power tool according to claim 1, characterized in that, The housing includes a pair of half-shells, with the connection surface of the half-shells defined as the central cross-section of the housing. The signal generating unit and the signal receiving unit are located at positions orthogonal to the central cross-section.

9. The power tool according to claim 1, characterized in that, The gear assembly is configured as a three-stage planetary gear, and the release element and the projection of the switch trigger on a plane parallel to the output shaft axis at least partially overlap.

10. The power tool according to claim 1, characterized in that, The gear assembly includes an internal gear ring disposed near the output shaft. The torque clutch mechanism includes a boss disposed on the internal gear ring and a rolling element abutting against the boss. One side of the release element abuts against the rolling element, and the other side abuts against the elastic element. When the release element moves axially along the output shaft against the force of the elastic element, the output shaft interrupts torque output.

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