Power tool
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU DONGCHENG TOOLS TECH CO LTD
- Filing Date
- 2026-01-23
- Publication Date
- 2026-07-24
Smart Images
Figure CN122442579A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of construction equipment technology, specifically to a power tool. Background Technology
[0002] As a heavy-duty professional tool, the design of upright wrenches typically focuses on performance and ergonomics under working conditions, while neglecting portability during work breaks and site relocation. Because the lower working section needs to house heavy components such as the motor and impact mechanism, and usually includes a battery pack, its overall weight and center of gravity are significantly higher than the upper grip section.
[0003] The configuration of upright wrenches is dynamically changeable to adapt to different work needs. For example, to extend battery life, different capacity (weight) battery packs are used; to install or remove bolts of different sizes, different sized sockets (weight and length) are used. These accessory changes directly alter the tool's overall center of gravity in a lateral position. Existing fixed auxiliary handles only provide a single gripping point. When the tool's center of gravity shifts due to configuration changes, the user will feel a noticeable "top-heavy" or "top-light" feeling when lifting the tool from that fixed point, generating an unbalanced torque that requires extra wrist strength to counteract, easily leading to fatigue or even slippage. This "unchanging" handling design fundamentally contradicts the "flexible" configuration requirements of tools.
[0004] Therefore, it is indeed necessary to provide an improved power tool to overcome the shortcomings of the existing technology. Summary of the Invention
[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a power tool with an auxiliary handle of elongated design, providing a continuous grip position adjustment track.
[0006] The technical solution adopted by this application to solve the problem of the prior art is: a power tool, comprising: A power assembly, comprising an output shaft for externally outputting torque, wherein a working head is detachably configured at the front end of the output shaft for external operation; A power housing for housing the power assembly, wherein the output shaft is rotatably supported on the power housing and protrudes from one end of the power housing; A handle housing that extends along the axial direction of the output shaft and is connected to the other end of the power housing; A battery pack, which is detachably configured in the handle housing and provides electrical power to the power unit; The power tool also includes an auxiliary handle for the user to hold, one end of which is disposed in the power housing and the other end extends rearward, and the length of the auxiliary handle is in the range of 125mm-160mm.
[0007] Another technical solution adopted by this application to solve the problem of the prior art is: a power tool, comprising: A power assembly, comprising an output shaft for externally outputting torque, wherein a working head is detachably configured at the front end of the output shaft for external operation; A power housing for housing the power assembly, wherein the output shaft is rotatably supported on the power housing and protrudes from one end of the power housing; A handle housing that extends along the axial direction of the output shaft and is connected to the other end of the power housing; A battery pack, which is detachably configured in the handle housing and provides electrical power to the power unit; An auxiliary handle for user gripping, the auxiliary handle being disposed on the power housing, the handle housing, or between the power housing and the handle housing; The auxiliary handle has at least two grip positions to accommodate changes in the center of gravity when the power tool is equipped with different attachments.
[0008] Compared with the prior art, this application has the following beneficial effects: The power tool of this application features an auxiliary handle that, by increasing the length of the central grip, provides multiple grip positions arranged linearly along the axial direction to accommodate changes in the power tool's center of gravity when equipped with different attachments. The central grip offers a continuous grip position adjustment structure, allowing the power tool's lateral center of gravity to shift when the user removes the battery pack or working socket. The user can intuitively lift the tool and move the grip points back and forth along the handle's length to quickly find the optimal position that maintains the power tool's basic horizontality or torque balance when lifted, thus eliminating the feeling of imbalance caused by changes in attachment configuration. Attached Figure Description
[0009] Figure 1 This is a perspective view of the power tool of this application; Figure 2 for Figure 1 A half-sectional view of the power tool; Figure 3 for Figure 1 A half-section view of the power tool from another angle; Figure 4 for Figure 1 Assembly drawing of the auxiliary handle of the power tool; Figure 5 for Figure 1 Another view of the assembly diagram of the auxiliary handle of the power tool; Figure 6 for Figure 1Exploded view of the auxiliary handle of the power tool; Figure 7 for Figure 1 The diagram shows the grip position of the power tool with only the working head configured. Figure 8 for Figure 1 The diagram shows only the battery pack grip position of the power tool; Figure 9 for Figure 1 A schematic diagram of the power tool configuration, including the working head and battery pack grip positions; Figure 10 for Figure 1 The diagram shows that the power tool is neither equipped with a working head nor with a battery pack holding position. Figure 11 for Figure 1 Half-section view of the wiring path of the power supply wire for the power tool; Figure 12 for Figure 11 A schematic diagram of the wiring path of the power supply wire for the power tool; Meaning of the reference numerals in the diagram: 100. Power tools; 200. Work heads; 10. Power housing; 11. Front housing; 12. Motor housing; 121. First motor half-housing; 122. Second motor half-housing; 123. Connecting lug; 124. First through hole. 20. Power assembly; 21. Motor; 22. Transmission mechanism; 221. Planetary gear set; 222. Drive shaft; 2221. Second guide groove; 23. Impact mechanism; 231. Strike block; 2311. First guide groove; 232. Impact spring; 233. Steel ball; 24. Output shaft. 30. Handle housing; 301. First handle half-shell; 302. Second handle half-shell; 31. Grip assembly; 32. First cavity; 33. Electrical components; 40. Shock-absorbing component; 40a. Second through hole; 41. First connector; 42. Second connector; 421. Strip through hole; 43. Elastic element; 44. First pin; 45. First washer; 46. Second washer; 47. Second pin. 50. Auxiliary handle; 501. First grip half shell; 502. Second grip half shell; 51. Front connecting part; 52. Middle grip part; 521. First finger groove; 522. Second finger groove; 523. Third finger groove; 524. Fourth finger groove; 525. Fifth finger groove; 526. Sixth finger groove; 53. Rear connecting part; 531. Notch; 60. Power supply; 61. Power supply wire; 61a. First wiring path; 61b. Second wiring path; 61c. Third wiring path; 62. Electrical connector. Detailed Implementation
[0010] The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the application. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the application.
[0011] As a heavy-duty professional tool, the vertical wrench is frequently moved between different workstations by the operator in actual use. Existing vertical wrenches have an auxiliary handle near the middle. When it is necessary to move the vertical wrench, it can be placed horizontally, and the auxiliary handle can be used to lift the vertical wrench with one hand like carrying a box and move it to the workstation.
[0012] However, existing upright wrenches are configured dynamically according to different job requirements. For example, to extend battery life, different capacity (weight) battery packs are used, and to install or remove bolts of different sizes, different sized sockets (weight and length) are used. These accessory changes directly alter the tool's overall center of gravity in a lateral position. When the center of gravity shifts due to configuration changes, the user will feel a noticeable "top-heavy" or "top-light" feeling when lifting the tool by gripping the secondary handle, creating an unbalanced torque that requires extra wrist strength to counteract, easily leading to fatigue or even slippage.
[0013] To address the aforementioned problems, this application provides a power tool 100 that, by adding an auxiliary handle with an elongated gripping area, provides a continuous gripping position adjustment structure, thereby enabling the power tool 100 to adapt to changes in the tool's dynamic center of gravity. The power tool 100 of this application includes a working part capable of outputting torque, a handle part for the user to grip, and a connecting part connecting the working part and the handle part. Vibrations generated by the working part are transmitted throughout the working part and then to the handle part through the connecting part. This document uses electric impact tools (such as impact wrenches) as examples to describe the concept of this application, but it is not limited to these. The power tool can also be other types of power tools known or common in the art, such as vertical hammer drills, vertical impact drills, concrete vibrators, etc. Accordingly, the inventive concept of this document is also applicable to these power tools.
[0014] See Figure 1The power tool 100 may include three components: a working part, a handle part, and a connecting part for connecting the two as a whole. In the power tool 100, the working part, the connecting part, and the handle part are arranged in a straight line from front to back. The power tool 100 outputs torque in a vertical position in most working conditions, with the user holding the handle part in a standing position, while the working part acts downwards to the ground to output torque.
[0015] See Figure 1 The power tool 100 also includes a power supply 60 that provides electrical energy to the power tool 100. In some embodiments of this application, the power supply 60 is a DC power supply. The DC power supply is used to provide electrical energy to the power tool 100. The DC power supply is a battery pack, which, in conjunction with a corresponding power circuit, supplies power to the power tool 100. Those skilled in the art should understand that the power supply 60 is not limited to scenarios using DC power; it can also supply power to various components of the power tool 100 through mains power or AC power, in conjunction with corresponding rectification, filtering, and voltage regulation circuits. In the following description, the battery pack 60 will be used instead of the power supply, but this should not be construed as a limitation of the present invention.
[0016] To facilitate a clear explanation of the specific content of the technical solution of this invention, the following definitions are made: the output direction of the power tool 100 is defined as the front; the direction opposite to the output direction of the power tool 100 is defined as the rear; the rotation axis of the output shaft 24 and the direction parallel to it are defined as the axial direction; the radial direction of the circumferential direction with the rotation axis of the output shaft 24 as the central axis is defined as the radial direction; and the circumferential direction with the rotation axis of the output shaft 24 as the central axis is defined as the circumferential direction.
[0017] like Figures 1-3 As shown, the power tool 100 is generally in a straight line shape. The working part located at the front end may include a power housing 10 forming the outline, and a power assembly 20 housed inside the power housing 10. In some embodiments of this application, the power housing 10 may include a front housing 11 and a motor housing 12. The front housing 11 is generally cylindrical and may be integrally formed from a metal material. The motor housing 12 has a semi-shell structure, that is, the motor housing 12 may be formed by a first motor semi-shell 121 and a second motor semi-shell 122 with generally symmetrical shapes fitted together. It may be made of plastic material, and the motor housing 12 may be fastened to the rear end of the front housing 11 by circumferentially distributed bolts. The rear end of the power housing 10 is used to connect to a handle housing 30 for the user to hold.
[0018] In some embodiments of this application, the power assembly 20 may include, from rear to front, a motor 21 housed in the motor housing 12, a transmission mechanism 22 and an impact mechanism 23 housed in the front housing 11, and an output shaft 24 passing through the front end of the front housing 11. The transmission mechanism 22 may include a planetary gear set 221 and a drive shaft 222, and the impact mechanism 23 may include a striking block 231 and an impact spring 232.
[0019] The front end of the motor 21 drives the drive shaft 222 to rotate around its own axis via a planetary gear set 221. A roughly V-shaped second guide groove 2221 is formed on the outer circumferential surface of the drive shaft 222. A first guide groove 2311, opposite to the second guide groove 2221, is formed on the inner circumferential surface of the striking block 231 in the impact mechanism 23. A steel ball 233 is movably placed within the channel formed by the first guide groove 2311 and the second guide groove 2221. When the drive shaft 222 is driven to rotate by the motor 21, the steel ball 233 also rolls along the trajectory of the channel formed by the first guide groove 2311 and the second guide groove 2221. When the drive shaft 222 rotates, the sidewall of the second guide groove 2221 squeezes the steel ball 233. After being squeezed, the steel ball 233 transmits force to the sidewall of the first guide groove 2311, thereby pushing the striking block 231 to rotate circumferentially and move axially. During the movement of the steel ball 233, when the output shaft 24 encounters resistance, the striking block 231 is driven to rotate circumferentially while retracting axially; when the output shaft 24 does not encounter resistance, the striking block 231 only rotates circumferentially (this is the general process of tightening bolts with an impact wrench: at the beginning of tightening, the striking block 231 only rotates circumferentially and simultaneously drives the output shaft 24 to rotate circumferentially; after the initial tightening is in place, the striking block 231 begins to move back and forth axially while impacting the output shaft 24 circumferentially, and the output shaft 24 has a circumferential impact force, which can further tighten the bolt). That is, the transmission mechanism 22 drives the striking block 231 to rotate circumferentially and move axially at the same time, so that the striking block 231 applies a circumferential impact force to the output shaft 24 through the impact mechanism 23.
[0020] See Figures 1-3 The power tool 100 also includes a handle portion located at the rear end for a user to grip. The handle portion is generally T-shaped and may include a handle housing 30 and a grip assembly 31 attached to the side wall of the handle housing 30.
[0021] In some embodiments of this application, the handle housing 30 may be a semi-shell structure, that is, the handle housing 30 may be formed by a first handle semi-shell 301 and a second handle semi-shell 302 with approximately symmetrical shapes overlapping each other, and it may be made of plastic. The front end of the handle housing 30 is used to connect to the aforementioned power housing 10. For the overall aesthetics and smoothness of the power tool 100, the front profile of the handle housing 30 and the rear profile of the power housing 10 may be set to be approximately the same. In addition, following the principles of ergonomics, the width of the rear half of the handle housing 30 is set to be greater than the width of its front half. Thus, placing the grip assembly 31 in the rear half of the handle housing 30 is more conducive to the convenience and comfort of the user.
[0022] See Figures 1-3 The power tool 100 also includes a connecting part for connecting the working part and the handle part into a whole. The connecting part not only serves to connect the working part and the handle part, but also serves to isolate the vibration between the working part and the handle part.
[0023] The connection portion of the power tool 100 can be specifically implemented as a shock-absorbing assembly 40. The shock-absorbing assembly 40 includes a first connector 41 connected to the power housing 10, a second connector 42 connected to the handle housing 30, and an elastic element 43 disposed between the first connector 41 and the second connector 42 for shock absorption. Furthermore, the first connector 41 is supported on the second connector 42, and the two have an axial support structure, a radial support structure, and a circumferential support structure. This allows the first connector 41 and the second connector 42 to only have relative displacement in the axial direction. This relative displacement can change the deformation of the elastic element 43, thereby providing sufficient axial flexibility to absorb the high-energy, low-frequency, high-amplitude vibrations generated by the working part at the front end of the power tool 100, achieving a better shock absorption effect.
[0024] The power housing 10 and the handle housing 30 are dynamically connected by a shock-absorbing component 40. When the user holds the handle housing 30 and turns on the switch during operation, the impact mechanism 23 generates a periodic impact torque. The axial vibration generated by this torque first acts on the power housing 10. Since the power housing 10 and the handle housing 30 are connected by an elastic element 43, most of the impact energy is converted into the elastic potential energy of the elastic element 43. In this process, the elastic element 43 can not only transmit continuous downward pressure, but also filter out high-frequency and high-amplitude impact vibration components, so that the force transmitted to the power housing 10 and the handle housing 30 is mainly a smooth and continuous downward pressure feedback, while harmful impact peaks are greatly attenuated.
[0025] like Figure 3As shown, in one embodiment of this application, the shock-absorbing assembly 40 includes a first connector 41 fixedly disposed at the rear end of the power housing 10, a second connector 42 fixedly disposed at the front end of the handle housing 30, and an elastic element 43 pressing against the first connector 41 and the second connector 42. The second connector 42 is axially movably inserted into the rear end of the first connector 41, and can change the compression deformation of the elastic element 43 when the two are relatively displaced.
[0026] Optionally, the first connector 41 has a generally square tubular structure, which can be specifically implemented as a square tube made of metal material, with openings at both the front and rear ends. The length extension direction of the first connector 41 can be consistent with the length extension direction of the power housing 10, and the front end of the first connector 41 is housed in the motor housing 12, while the rear end penetrates the motor housing 12 and extends rearward. In some specific embodiments of this application, the motor housing 12 and the first connector 41 can be fixedly connected by bolts. During assembly, the first motor half-housing 121 and the second motor half-housing 122 are closed together to clamp the first connector 41 in the middle. The bolts pass through the first motor half-housing 121, the first connector 41, and the second motor half-housing 122 in sequence, and are threaded together to fasten the three into one unit.
[0027] The second connector 42 also has a generally square tubular structure, which can be specifically implemented as a square tube made of metal material, with openings at both the front and rear ends. The length extension direction of the second connector 42 can be consistent with the length extension direction of the handle housing 30, and the front end of the second connector 42 is inserted into the rear end of the first connector 41, while the rear end of the second connector 42 is housed within the handle housing 30. In some specific embodiments of this application, the handle housing 30 and the second connector 42 can be fixedly connected by bolts. During assembly, the first handle half-shell 301 and the second handle half-shell 302 are closed together to clamp the second connector 42 in the middle. Two bolts arranged in a straight line along the axial direction pass through the first handle half-shell 301, the second connector 42, and the second handle half-shell 302 in sequence, and are threaded together to fasten the three into one unit.
[0028] In some other embodiments of this application, the first connector 41 may be integrally formed from the motor housing 12 extending axially rearward, and the second connector 42 may be integrally formed from the handle housing 30 extending axially forward. The elastic element 43 is pressed between the first connector 41 and the second connector 42 to provide shock absorption.
[0029] The axial support structure between the first connector 41 and the second connector 42 includes a first working part configured to transmit force with the first connector 41 and a second working part configured to transmit force with the second connector 42. In one specific embodiment, the first working part may include a first pin 44 inserted into the inner wall of the first connector 41 perpendicular to the axial direction and a first washer 45 abutting against the rear end of the first pin 44; the second working part may include a second washer 46 abutting against the front end face of the second connector 42. The elastic element 43 is pressed between the first washer 45 and the second washer 46.
[0030] The elastic element 43 can be specifically implemented as a compression spring, with its front end pressing forward against the first washer 45 and its rear end pressing backward against the second washer 46. The first washer 45 transmits the elastic biasing force axially to the first connector 41 through the first pin 44, and the second washer 46 directly transmits the elastic biasing force axially to the second connector 42 through the front end face of the second connector 42. When the power assembly 20 vibrates and acts on the power housing 10, it vibrates in the axial direction. During the vibration of the power housing 10, it and the handle housing 30 undergo relative displacement, and the distance between them changes continuously. When they approach each other, the first connector 41 and the second connector 42 increase the compression deformation of the elastic element 43; when they move away from each other, the first connector 41 and the second connector 42 reduce the compression deformation of the elastic element 43.
[0031] like Figure 2 , Figure 3 As shown, for safety and ergonomic considerations during operation of the power tool 100, an axial limiting structure is provided between the first connecting member 41 and the second connecting member 42. This structure limits the relative displacement that may occur between the power housing 10 and the handle housing 30, preventing them from getting too close or too far apart. The axial limiting structure includes a second pin 47 inserted into the inner wall of the first connecting member 41 perpendicular to the axial direction and a strip-shaped through hole 421 formed in the side wall of the second connecting member 42 to allow the second pin 47 to pass through. The strip-shaped through hole 421 extends axially, and through its cooperation with the second pin 47, it limits the allowable relative displacement between the first connecting member 41 and the second connecting member 42 to the axial extension length of the strip-shaped through hole 421. This limits the upper and lower limit compressibility deformation of the elastic element 43, ensuring that the elastic element 43 is always compressed while preventing over-compression. Simultaneously, it limits the distance between the power housing 10 and the handle housing 30, preventing them from colliding or separating.
[0032] The radial support structure between the first connector 41 and the second connector 42 prevents relative displacement in the radial direction by interlocking them. In some specific embodiments of this application, the size of the second connector 42 can be smaller than that of the first connector 41, allowing the front end of the second connector 42 to be inserted into the rear end of the first connector 41. This interlocking method prevents relative displacement in the radial direction between the first connector 41 and the second connector 42. Simultaneously, the elastic element 43, the first gasket 45, and the second gasket 46 are all built into the first connector 41. Of course, the interlocking relationship between the first connector 41 and the second connector 42 can also be reversed, i.e., the size of the second connector 42 can be larger than that of the first connector 41, allowing the rear end of the first connector 41 to be inserted into the front end of the second connector 42.
[0033] The circumferential support structure between the first connector 41 and the second connector 42 achieves mutual circumferential support through their shape matching, preventing rotational displacement in the circumferential direction and thus serving as an anti-rotation function. In some specific embodiments of this application, the first connector 41 and the second connector 42 can be triangular, square, or concave-convex shapes with the same outline. Of course, their shapes are not limited to these; as long as they prevent relative circumferential rotational displacement when their shapes match, they can be used as embodiments of this application.
[0034] See Figure 1 The power tool 100 also includes an auxiliary handle 50 for the user to grip. When the user needs to move the power tool 100 from one work site to another, the user can first place the power tool 100 horizontally, then hold the auxiliary handle 50 to move it to the next work site in this horizontal position, and then place it vertically for operation. The auxiliary handle 50 can be configured on the power housing 10 or the handle housing 30, or one end can be connected to the power housing 10 and the other end to the handle housing 30.
[0035] In the power tool 100, the front housing 11, power assembly 20, motor 21, etc., located at its front end are all made of metal. Therefore, the center of gravity of the power tool 100 is closer to the front end than its center point. In order to make the auxiliary handle 50 match the center of gravity of the power tool 100, in some embodiments of this application, one end of the auxiliary handle 50 can be connected to the power housing 10, and the other end extends rearward and is connected to the first connector 41. The auxiliary handle 50 has a semi-shell structure, which is formed by the relative overlapping of the first gripping semi-shell 501 and the second gripping semi-shell 502.
[0036] like Figure 4 , Figure 5 , Figure 6As shown, the auxiliary handle 50 includes a front connecting part 51, a middle grip part 52, and a rear connecting part 53 from front to back. The front connecting part 51 is used to be fixedly connected to the power housing 10, the rear connecting part 53 is used to be fixedly connected to the first connecting member 41, and the middle grip part 52 is used for the user to hold when the power tool 100 is placed horizontally.
[0037] The front connecting portion 51 is attached to the outer peripheral surface of the motor housing portion 12 by fasteners. Specifically, a connecting lug 123 can protrude radially outward from the outer peripheral surface of the motor housing portion 12. The connecting lug 123 is provided with bolt holes for the fasteners to pass through. The first gripping half-shell 501 and the second gripping half-shell 502 are arranged opposite each other on both sides of the connecting lug 123, and the front connecting portions 51 on the first gripping half-shell 501 and the second gripping half-shell 502 are aligned with the connecting lug 123. The fasteners pass through the front connecting portions 51 on the first gripping half-shell 501, the connecting lug 123, and the front connecting portions 51 on the second gripping half-shell 502 in sequence, thereby fastening the three together as one unit. The fasteners can be implemented as bolts.
[0038] The intermediate grip portion 52 extends rearward from the rear end of the aforementioned front connecting portion 51, and the length extension direction of the intermediate grip portion 52 is parallel to the line connecting the aforementioned power housing 10 and handle housing 30. In order to accommodate the changes in the center of gravity of the power tool 100 caused by the configuration of the battery pack, sleeve, or bare state, and to enable the user to change the grip position according to the dynamic changes in the center of gravity of the power tool 100, multiple finger grooves for accommodating the user's fingers can be arranged linearly on the intermediate grip portion 52. In one specific embodiment of this application, the first finger groove 521, the second finger groove 522, the third finger groove 523, the fourth finger groove 524, the fifth finger groove 525, and the sixth finger groove 526 are arranged linearly from front to back on the intermediate grip portion 52.
[0039] like Figure 7 As shown, when the power tool 100 is configured with the working head 200 only at the front end of the output shaft 24, and the battery pack 60 is not inserted into the handle housing 30, the first finger groove 521, the second finger groove 522, the third finger groove 523, and the fourth finger groove 524 can jointly form a first grip position W1 for the user to hold. The projection of the center of gravity of the power tool 100 on the plane where the middle grip portion 52 is located is within a preset range of the first grip position W1. In this case where the center of gravity of the power tool 100 is shifted forward, there will be no unbalanced torque when the user holds the first grip position W1 formed above. The user's wrist and forearm do not need to continuously apply torque to correct the tilt of the tool, which greatly reduces muscle fatigue during the handling process.
[0040] like Figure 8As shown, when the power tool 100 only has the battery pack 60 plugged into the handle housing 30, and the working head 200 is not configured at the front end of the output shaft 24, the third finger groove 523, the fourth finger groove 524, the fifth finger groove 525, and the sixth finger groove 526 can jointly form a second grip position W2 for the user to hold. The projection of the center of gravity of the power tool 100 on the plane where the middle grip portion 52 is located is within a preset range of the second grip position W2. In this case where the center of gravity of the power tool 100 is shifted backward, there will be no unbalanced torque when the user holds the second grip position W2 formed above. The user's wrist and forearm do not need to continuously apply torque to correct the tilt of the tool, which greatly reduces muscle fatigue during the handling process.
[0041] like Figure 9 As shown, when the power tool 100 is simultaneously equipped with a working head 200 at the front end of the output shaft 24 and a battery pack 60 is plugged into the handle housing 30; or as Figure 10 As shown, when the power tool 100 is neither equipped with a working head 200 at the front end of the output shaft 24 nor has a battery pack 60 inserted into the handle housing 30, the second finger groove 522, the third finger groove 523, the fourth finger groove 524, and the fifth finger groove 525 can collectively form a third grip position W3 for the user to hold. The projection of the center of gravity of the power tool 100 onto the plane where the intermediate grip portion 52 is located is within a preset range of the third grip position W3. In this case where the center of gravity of the power tool 100 is centered, there will be no unbalanced torque when the user holds the third grip position W3 formed above. The user's wrist and forearm do not need to continuously apply torque to correct the tilt of the tool, which greatly reduces muscle fatigue during the handling process.
[0042] See Figure 4 , Figure 5 , Figure 6 The rear connecting portion 53 extends from the aforementioned intermediate grip portion 52 toward the first connecting member 41. In some specific embodiments of this application, the rear connecting portion 53 can be securely connected to the first connecting member 4 to improve the connection tightness between the auxiliary handle 50 and the power tool 100. The auxiliary handle 50 is formed by a first grip half-shell 501 and a second grip half-shell 502, and both of their mating end faces have approximately square notches 531. The two notches 531 are arranged opposite each other and form a larger square notch, which is adapted to the contour of the cross-section of the first connecting member 41. The aforementioned first grip half-shell 501 and second grip half-shell 502 are arranged opposite each other on both sides of the first connecting member 41. The first grip half-shell 501 and second grip half-shell 502 are connected as one unit by fasteners, and the first connecting member 41 is clamped between them, thereby realizing the connection between the rear connecting portion 53 and the first connecting member 41.
[0043] In some embodiments of this application, the front connecting part 41, the middle grip part 42, and the rear connecting part 43 may be integrally injection molded from plastic to form an auxiliary handle 50. Of course, the actual structure of the auxiliary handle 50 is not limited to this; as long as it allows the user to grip it horizontally, it can be considered a specific implementation of this application.
[0044] To comprehensively consider the adjustability of the user's grip position to correspond to changes in the center of gravity of the power tool 100 when equipped with different accessories and to ensure the overall coordination of the power tool 100, the length L1 of the auxiliary handle 50 can range from 125mm to 160mm. The length L1 of the auxiliary handle 50 can be the projection of the central grip portion 52 onto a plane parallel to the axial direction.
[0045] In some embodiments of this application, the length L1 of the auxiliary handle 50 can be 125 mm.
[0046] In some embodiments of this application, the length L1 of the auxiliary handle 50 can be 145mm.
[0047] In some embodiments of this application, the length L1 of the auxiliary handle 50 can be 160 mm.
[0048] The aforementioned auxiliary handle 50, by increasing the length of the intermediate grip 52, allows the intermediate grip 52 to provide multiple grip positions arranged linearly along the axial direction, accommodating changes in the center of gravity of the power tool 100 when different attachments are configured. The intermediate grip 52 provides a continuous grip position adjustment structure, as the lateral center of gravity of the power tool 100 changes when the user removes the battery pack or working sleeve. The user can intuitively find an optimal position that keeps the power tool 100 basically horizontal or in torque balance when lifted by moving the grip point back and forth along the length of the handle, thereby eliminating the feeling of imbalance caused by changes in attachment configuration.
[0049] As a complex power tool integrating a motor, battery pack, and control circuitry, the electrical reliability of a vertical wrench is crucial. In existing technology, the wiring supplying power to the lower drive motor typically takes the most direct path: it runs from the battery pack output at the top, passes through or around the intermediate shock-absorbing assembly, and connects directly to the lower motor and control unit. While this "two-point-one-line" wiring method is simple, it introduces significant drawbacks to maintenance and diagnostics.
[0050] When an upright wrench experiences an electrical fault (such as failure to start or abnormal power), the fault may be located in the upper battery pack or control circuit, or in the lower motor or impact mechanism. Because the power supply wires are enclosed within the housing and run through a complex connection structure including shock-absorbing components, maintenance personnel cannot quickly and non-destructively perform segmented electrical testing. Traditional troubleshooting methods typically require complete disassembly of the entire machine, thoroughly separating the upper and lower parts to check wire continuity and measure voltage signals segment by segment. This process is time-consuming and labor-intensive, increasing downtime, and frequent disassembly and reassembly may damage the functional components of the upright wrench, resulting in high maintenance costs and requiring a high level of expertise. Furthermore, this wiring configuration inevitably leads to movement interference between the power supply wires and shock-absorbing components during operation, causing wear on the power supply wires or failure of the shock-absorbing components.
[0051] To address the above technical issues, in some embodiments of this application, the auxiliary handle 50 may also provide a cavity for housing a power supply wire 61, which is used to transfer electrical energy from the battery pack 60 to the motor 21.
[0052] See Figure 11 The power supply wire 61 extends from the motor housing 12, passes sequentially through the auxiliary handle 50 and the shock absorption assembly 40, and finally enters the handle housing 30. The handle housing 30 is formed by the relative fitting of a first handle half-shell 301 and a second handle half-shell 302, which together form a first cavity 32. This first cavity 32 houses an electrical component 33, which is electrically connected to a battery pack 60 disposed in the handle housing 30. The power supply wire 61 obtains electrical energy from the battery pack 60 via the electrical component 33 and transmits it to the motor 21.
[0053] The first end of the power supply wire 61 is electrically connected to the winding of the motor 21, and the second end extends toward the connection between the auxiliary handle 50 and the motor housing 12. A first through hole 124 is provided at this connection, and the second end of the power supply wire 61 passes through this first through hole 124, penetrates the motor housing 12, and enters the inner cavity of the auxiliary handle 50. The portion of the power supply wire 61 housed in the motor housing 12 constitutes the first wiring path 61a of the power supply path of the power tool 100.
[0054] The aforementioned power supply wire 61 passes through the motor housing 12, then passes through the front connecting portion 51 of the auxiliary handle 50 and enters the inner cavity of the auxiliary handle 50. Subsequently, the second end of the power supply wire 61 continues to extend rearward along the inner contour of the middle grip portion 52 to the rear connecting portion 53. The portion of the power supply wire 61 housed within the inner cavity of the auxiliary handle 50 constitutes the second wiring path 61b of the power supply path of the power tool 100. In some specific embodiments of this application, the inner cavity of the auxiliary handle 50 also houses a plurality of electrical connectors 62, which are used to electrically connect the segmented power supply wires 61 in the second wiring path 61b. The plurality of electrical connectors 62 are staggered to make efficient use of the inner cavity space of the auxiliary handle 50.
[0055] Since the rear connecting part 53 is connected to the aforementioned shock-absorbing assembly 40, and the shock-absorbing assembly 40 has a second through hole 40a at this connection point, the second through hole 40a extends from the outer wall of the first connecting member 41 to the inner wall of the second connecting member 42, and the first gripping half-shell 501 and the second gripping half-shell 502 on the auxiliary handle 50 enclose the second through hole 40a. The second end of the power supply wire 61 is led out from the rear connecting part 53 of the auxiliary handle 50 and enters the interior of the second connecting member 42 through the second through hole 40a. The rear end of the second connecting member 42 of the aforementioned shock-absorbing assembly 40 is open. After the second end of the power supply wire 61 enters the interior of the second connecting member 42, it continues to extend rearward until it is led out from the rear opening of the second connecting member 42 and enters the first cavity 32 of the aforementioned handle housing 30. After the second end of the power supply wire 61 enters the aforementioned first cavity 32, it continues to extend toward the electrical component 33 and is electrically connected to it, thus forming the third wiring path 61c of the power supply path of the power tool 100.
[0056] The electrical energy of the battery pack 60 is conducted to the power supply wire 61 after being permitted by the electrical component 33. The power supply wire 61 passes from back to front through the handle housing 30, the shock absorption component 40, the auxiliary handle 50, and the motor housing 12 before transmitting the electrical energy to the motor 21. After obtaining electrical energy, the motor 21 can output power to the power component 20, thereby outputting torque to the outside.
[0057] The power tool 100 in this application utilizes the power supply wire 61, formed by the aforementioned first wiring path 61a, second wiring path 61b, and third wiring path 61c, to route the power supply wire 61 along a preset path within the auxiliary handle 50. This serves as a key detection node for the electrical system of the power tool 100, facilitating non-invasive and rapid fault diagnosis and location for the user. Specifically, when a fault occurs during the operation of the power tool 100, the user does not need to disassemble the entire machine for diagnosis. They only need to disassemble the semi-shell structure of the auxiliary handle 50 to expose the power supply wire 61, allowing them to detect the electrical signal flowing through it and determine whether the fault occurs in the upper or lower part of the power tool 100. This method of initial fault location without disassembling the entire machine significantly improves maintenance efficiency.
[0058] Furthermore, the auxiliary handle 50, serving as an intermediate connecting structure between the upper and lower parts of the power tool 100, also provides an independent, stable, and protected wiring channel. This allows the power supply wire 61 to bypass the moving parts in the shock absorption assembly 40, fundamentally eliminating the risk of wear and tear caused by relative movement. The wiring is more organized and reliable, improving the long-term electrical safety and durability of the product.
[0059] Furthermore, the internal electrical connector 62 of the auxiliary handle 50 allows for a clear electrical separation between the upper power module and the lower drive module of the power tool 100. This not only facilitates fault diagnosis but also enables subsequent modular replacement and maintenance. Users can quickly identify and replace faulty modules, significantly shortening the maintenance cycle and improving user satisfaction.
[0060] The power tool 100 in this application transforms an auxiliary handle 50, originally intended to improve the handling experience, into a new core system function: an electrical trunk channel and a diagnostic node, achieving a "multi-purpose" system integration innovation. Essentially, it establishes a new, two-stage electrical architecture with an intermediate detection point for the power tool 100. This provides the physical basis for designing a simple built-in diagnostic circuit.
[0061] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.
Claims
1. A power tool, characterized in that, include: A power assembly, comprising an output shaft for externally outputting torque, wherein a working head is detachably configured at the front end of the output shaft for external operation; A power housing for housing the power assembly, wherein the output shaft is rotatably supported on the power housing and protrudes from one end of the power housing; A handle housing that extends along the axial direction of the output shaft and is connected to the other end of the power housing; A battery pack, which is detachably configured in the handle housing and provides electrical power to the power unit; The power tool also includes an auxiliary handle for the user to hold, one end of which is disposed in the power housing and the other end extends rearward, and the length of the auxiliary handle is in the range of 125mm-160mm.
2. The power tool according to claim 1, characterized in that, When the output shaft of the power tool is equipped with a working head, the auxiliary handle has a first grip position near the power housing to correspond to the center of gravity of the power tool; When the handle housing of the power tool is equipped with a battery pack, the auxiliary handle has a second grip position near the handle housing to correspond to the center of gravity of the power tool; When the power tool is equipped with both a working head and a battery pack, or when it is not equipped with both a working head and a battery pack, the auxiliary handle has a third grip position located between the first grip position and the second grip position to correspond to the center of gravity of the power tool.
3. The power tool according to claim 2, characterized in that, The auxiliary handle is disposed on the power housing, and the auxiliary handle includes a front connecting part connected to the power housing and a middle grip part for the user to hold. The line connecting the power housing and the handle housing is parallel to the length extension direction of the middle grip part.
4. The power tool according to claim 3, characterized in that, The middle grip portion has a first finger groove, a second finger groove, a third finger groove, a fourth finger groove, a fifth finger groove, and a sixth finger groove arranged linearly from front to back along its own length extension direction; The first finger groove, the second finger groove, the third finger groove, and the fourth finger groove together form the first grip position; The third, fourth, fifth, and sixth finger grooves together form the second grip position; The second, third, fourth, and fifth finger grooves together form the third grip position.
5. The power tool according to claim 4, characterized in that, When the output shaft of the power tool is equipped with a working head, the projection of the center of gravity of the power tool onto the plane where the intermediate grip is located is within a preset range of the first grip position; When the handle housing of the power tool is equipped with a battery pack, the projection of the center of gravity of the power tool onto the plane where the middle grip is located is within a preset range of the second grip position; When the power tool is equipped with both a working head and a battery pack, or when it is not equipped with both a working head and a battery pack, the projection of the center of gravity of the power tool onto the plane where the middle grip is located is within a preset range of the third grip position.
6. The power tool according to claim 3, characterized in that, A shock-absorbing assembly is provided between the power housing and the handle housing. The shock-absorbing assembly includes a first connector connected to the power housing and a second connector connected to the handle housing. A shock-absorbing element is provided between the first connector and the second connector.
7. The power tool according to claim 6, characterized in that, The auxiliary handle also includes a rear connecting part located behind the middle grip portion, and the rear connecting part is fixedly connected to the first connector.
8. The power tool according to claim 7, characterized in that, The auxiliary handle includes a first grip half-shell and a second grip half-shell, which are arranged to overlap each other.
9. The power tool according to claim 8, characterized in that, The outer surface of the power housing has connecting lugs, and the first gripping half-shell and the second gripping half-shell cover the connecting lugs on the front connecting part and are connected by fasteners.
10. The power tool according to claim 8, characterized in that, The end faces of the first gripping half shell and the second gripping half shell that fit together have oppositely arranged notches, and the shape outline enclosed by the two notches is adapted to the cross-sectional outline of the first connector.
11. A power tool, characterized in that, include: A power assembly, comprising an output shaft for externally outputting torque, wherein a working head is detachably configured at the front end of the output shaft for external operation; A power housing for housing the power assembly, wherein the output shaft is rotatably supported on the power housing and protrudes from one end of the power housing; A handle housing that extends along the axial direction of the output shaft and is connected to the other end of the power housing; A battery pack, which is detachably configured in the handle housing and provides electrical power to the power unit; An auxiliary handle for user gripping, the auxiliary handle being disposed on the power housing, the handle housing, or between the power housing and the handle housing; The auxiliary handle has at least two grip positions to accommodate changes in the center of gravity when the power tool is equipped with different attachments.
12. The power tool according to claim 11, characterized in that, The auxiliary handle has three grip positions: a first grip position at the front, a second grip position at the rear, and a third grip position between the first and second grip positions.
13. The power tool according to claim 12, characterized in that, When the output shaft of the power tool is equipped with a working head, the first grip position corresponds to the center of gravity of the power tool; When the handle housing of the power tool is equipped with a battery pack, the second grip position corresponds to the center of gravity of the power tool; When the power tool is equipped with both a working head and a battery pack, or when it is not equipped with both a working head and a battery pack, the third grip position corresponds to the center of gravity of the power tool.
14. The power tool according to claim 13, characterized in that, The auxiliary handle has a first finger groove, a second finger groove, a third finger groove, a fourth finger groove, a fifth finger groove, and a sixth finger groove arranged linearly from front to back; The first finger groove, the second finger groove, the third finger groove, and the fourth finger groove together form the first grip position; The third, fourth, fifth, and sixth finger grooves together form the second grip position; The second, third, fourth, and fifth finger grooves together form the third grip position.
15. The power tool according to claim 14, characterized in that, When the output shaft of the power tool is equipped with a working head, the projection of the center of gravity of the power tool onto the plane where the auxiliary handle is located is within a preset range of the first grip position; When the handle housing of the power tool is equipped with a battery pack, the projection of the center of gravity of the power tool onto the plane of the auxiliary handle is within a preset range of the second grip position; When the power tool is equipped with both a working head and a battery pack, or when it is not equipped with both a working head and a battery pack, the projection of the center of gravity of the power tool onto the plane where the auxiliary handle is located is within a preset range of the third grip position.