Power tool

Abstract

The application provides a power tool, and relates to the field of construction equipment, which comprises a power assembly, a power housing, a handle housing and a damping assembly; wherein the damping assembly comprises a first connecting piece connected to the power housing, a second connecting piece connected to the handle housing, and an elastic element arranged between the first connecting piece and the second connecting piece; the first connecting piece is supported on the second connecting piece, and the two can produce relative displacement to change the deformation amount of the elastic element. The application provides a power tool, which connects the upper part and the lower part by using a spring, fundamentally cuts off the direct transmission path of vibration, and reduces the vibration amplitude transmitted to the upper part to a very low level.

Description

Technical Field

[0001] This application relates to the field of construction equipment technology, and in particular to a power tool. Background Technology

[0002] A standing wrench, also known as an impact wrench or floor wrench, is a type of electric or pneumatic tool widely used for removing and installing large bolts. Its typical structure includes an upper grip and a lower working section. The upper section houses the switch, control unit, and handle for the user to hold while standing; the lower section contains the drive motor, impact mechanism, and working head that engages with the bolt. During operation, the tool is held vertically, with the lower part against the workpiece or ground. The user applies downward pressure by gripping the upper part and controls the operation; the impact force is primarily generated by the lower mechanism and acts on the bolt.

[0003] In existing technologies, the upper and lower parts of upright wrenches often employ a rigid connection structure, such as direct fixation via one or more sturdy connecting rods. While this structure ensures overall rigidity, it has significant drawbacks in actual operation: the intense vibrations and shock waves generated when the lower impact mechanism operates are transmitted directly to the upper gripping part through this rigid connection path with almost no attenuation. Prolonged use can lead to numbness and fatigue in the user's arms and even the entire body, severely impacting operational comfort and controllability, and potentially causing occupational health problems. Furthermore, continuous rigid vibrations can also cause premature damage to the upper electronic control components or precision parts.

[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 that uses a spring to connect the upper and lower parts, thereby fundamentally cutting off the direct transmission path of vibration and reducing the vibration amplitude transmitted to the upper part to an extremely low level.

[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, the handle housing being for a user to grip; A shock-absorbing assembly is disposed between the power housing and the handle housing; The shock absorption assembly includes a first connector connected to the power housing, a second connector connected to the handle housing, and an elastic element disposed between the first connector and the second connector. The first connector is supported by the second connector, and the two can generate relative displacement to change the deformation of the elastic element.

[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, the output shaft being rotatably supported on the power housing and protruding from one end of the power housing, and a first connector being provided at the other end of the power housing; A handle housing extends along the axial direction of the output shaft, and a second connector is provided at one end of the handle housing facing the power housing. The second connector is movably supported by the first connector. in, An elastic element is also provided between the first connector and the second connector; When a relative displacement occurs between the power housing and the handle housing, the deformation of the elastic element changes.

[0008] 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, the output shaft being rotatably supported on the power housing and protruding from one end of the power housing, and a first connector extending from the other end of the power housing; A handle housing extends along the axial direction of the output shaft, and a second connector extends from one end of the handle housing toward the power housing, the second connector being movably supported by the first connector; in, An elastic element is also provided between the first connector and the second connector; When a relative displacement occurs between the power housing and the handle housing, the deformation of the elastic element changes.

[0009] Compared with the prior art, this application has the following beneficial effects: The power tool described in this application employs a shock-absorbing assembly containing elastic elements for vibration reduction. It fully utilizes the linear or non-linear elastic characteristics of springs and optimizes the impact waveform unique to power tools, thereby achieving efficient capture and conversion of operational vibration energy. The impact energy is transformed into the elastic potential energy of the spring and gradually released, rather than simply buffered. This reduces the residual vibration felt by the user to an extremely low level, almost achieving "unnoticeable" operation, resulting in a qualitative leap in user experience. Attached Figure Description

[0010] 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 Exploded view of the power tool; Figure 5 This is a perspective view of the first embodiment of the power tool vibration damping assembly of this application; Figure 6 for Figure 5 A half-sectional view of the first embodiment of the power tool damping assembly shown; Figure 7 This is a perspective view of a second embodiment of the power tool vibration damping assembly of this application; Figure 8 for Figure 7 A half-sectional view of the second embodiment of the power tool damping assembly shown; Figure 9 This is a perspective view of the third embodiment of the power tool vibration damping assembly of this application; Figure 10 for Figure 9 A half-sectional view of the third embodiment of the power tool damping assembly shown; Figure 11 This is a perspective view of the fourth embodiment of the power tool vibration damping assembly of this application; Figure 12 for Figure 11 A half-sectional view of the fourth embodiment of the power tool damping assembly shown.

[0011] Meaning of the reference numerals in the diagram: 100. Power tools; 10. Power housing; 11. Front housing; 12. Motor housing; 121. First motor half-housing; 122. Second motor half-housing. 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 shell; 301. First handle half shell; 302. Second handle half shell; 31. Grip assembly; 40. Shock-absorbing component; 41. First connector; 411. Stepped surface; 42. Second connector; 421. Strip-shaped through hole; 43. Elastic element; 44. First pin; 45. First washer; 46. Second washer; 47. Second pin; 48. Shock-absorbing washer; 49. Collar; 410. Damping spring; 420. Locking sleeve; 430. First guide track; 440. Second guide track; 450. Guide steel ball; 50. Auxiliary handle; 501. First grip half-shell; 502. Second grip half-shell; 60. Power supply. Detailed Implementation

[0012] 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.

[0013] A standing wrench, also known as an impact wrench or floor wrench, is a type of electric or pneumatic tool widely used for removing and installing large bolts. Its typical structure includes an upper grip and a lower working section. The upper section houses the switch, control unit, and handle for the user to hold while standing; the lower section contains the drive motor, impact mechanism, and working head that engages with the bolt. During operation, the tool is held vertically, with the lower part against the workpiece or ground. The user applies downward pressure by gripping the upper part and controls the operation; the impact force is primarily generated by the lower mechanism and acts on the bolt.

[0014] Vertical wrenches often employ a rigid connection structure between the upper and lower parts, such as direct fixation via one or more sturdy connecting rods. While this structure ensures overall rigidity, it has significant drawbacks in actual operation: the intense vibrations and shock waves generated when the lower impact mechanism operates are transmitted directly to the upper grip with almost no attenuation through this rigid connection path. Prolonged use can lead to numbness and fatigue in the user's arms and even the entire body, severely impacting operational comfort and controllability, and potentially causing occupational health problems. Furthermore, continuous rigid vibrations can also cause premature damage to the upper electronic control components or precision parts.

[0015] To address the aforementioned vibration transmission problem, some existing technologies attempt to introduce damping components. Common practices include adding rubber washers, damping sleeves, or other cushioning parts at the connection between the connecting rod and the upper or lower section, or using locally flexible materials for connection. However, these improvements have significant limitations: First, elastomers such as rubber are prone to plastic deformation, aging, or fatigue fracture when subjected to high-intensity, high-frequency impact loads, resulting in a sharp decline in damping effectiveness over time and a limited lifespan. Second, localized buffering often only absorbs a portion of high-frequency vibrations and is ineffective in blocking the main impact energy transmission path, allowing a large amount of low-frequency, high-amplitude impact force to still be transmitted to the user.

[0016] To address the aforementioned problems, this application provides a power tool 100 that employs a spring-connected upper and lower section structure, fundamentally cutting off the direct transmission path of vibration and reducing the vibration amplitude transmitted to the upper section to an extremely low level. The power tool 100 of this application includes a working section capable of outputting torque, a handle section for user gripping, and a connecting section connecting the working section and the handle section. Vibrations generated by the working section are transmitted throughout the working section and then to the handle section via the connecting section. 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.

[0017] See Figure 1 The 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.

[0018] 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.

[0019] like Figures 1-3As 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 overlapping each other. 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.

[0020] 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.

[0021] 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 impact block 231 is driven to rotate circumferentially while retracting axially; when the output shaft 24 does not encounter resistance, the impact block 231 only rotates circumferentially (this is the general process of tightening bolts with an impact wrench: when tightening begins, the impact block 231 only rotates circumferentially and simultaneously drives the output shaft 24 to rotate circumferentially; after the initial tightening is in place, the impact 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). The impact spring 232 abuts against the drive shaft 43 at one end and against the impact block 231 at the other end. The impact block 231 has a mounting groove for installing the impact spring 232. When the impact block 231 rotates circumferentially and moves axially, the impact spring 232 causes the impact block 231 to generate an impact force, which is transmitted to the output shaft 24 through the joint between the impact block 231 and the output shaft 24. 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 circumferential impact force to the output shaft 24 through the impact mechanism 23.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] like Figures 4-6As 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figure 4 , Figure 6 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.

[0034] 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.

[0035] 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.

[0036] Furthermore, a damping pad 48 may be filled between the first connector 41 and the second connector 42 to block circumferential vibration between them. In some specific embodiments of this application, the damping pad 48 is a roughly U-shaped rubber pad, and two symmetrically arranged damping pads 48 fill the first connector 41 and the second connector 42, so that the first connector 41 and the second connector 42, which have a square tubular structure, flexibly fit together. The gap between the inner wall of the first connector 41 and the outer wall of the second connector 42 may be slightly smaller than the thickness of the damping pad 48, and the numerical range of the gap between the inner wall of the first connector 41 and the outer wall of the second connector 42 is 4mm-6mm. In some specific embodiments of this application, the gap may be 4.5mm. Two damping pads 48 are symmetrically filled in the gap between the two components. The outer surface of the damping pads 48 is attached to the inner wall of the first connector 41, and the inner surface is attached to the outer wall of the second connector 42. This arrangement ensures that the damping pads 48 cooperate to fully cover the four inner walls of the first connector 41 and the four outer walls of the second connector 42, preventing direct contact between the first connector 41 and the second connector 42. When the power housing 10 vibrates in the circumferential direction, the damping pads 48 can greatly block the vibration, preventing it from being transmitted to the handle housing 30 through the first connector 41 and the second connector 42. In some embodiments of this application, to avoid the damping pads 48 interfering with the movement of the damping assembly 40, the damping pads 48 can be positioned behind the elastic element 43, thereby avoiding the movement path of the damping assembly 40.

[0037] When the power tool 100 is in operation, the intense axial vibration generated by the impact mechanism 23 first acts on the power housing 10, and then is transmitted to the first connector 41. Since the first connector 41 and the second connector 42 are flexibly connected by a highly elastic, freely expandable compression spring, most of the energy of the axial vibration is converted into the elastic potential energy of the compression spring. During this process, the energy of the axial vibration is lost and dispersed by internal damping. Thus, when the power tool 100 is in operation, the compression spring can filter out the high-frequency, high-amplitude impact vibration while transmitting continuous axial pressure. Therefore, the axial force transmitted to the handle housing 30 is mainly a relatively smooth and continuous downward pressure. At the same time, the first connector 41 and the second connector 42 are connected by a plug-in method, which can ensure the overall stability of the power tool 100 during impact operation and effectively prevent the handle housing 30 from uncontrollable shaking caused by the back and forth expansion and contraction of the compression spring. Furthermore, the damping pad 48 filled between the first connector 41 and the second connector 42 not only isolates the radial vibrations generated between them, preventing direct contact, but also provides elastic deformation in the circumferential torsional direction to achieve a damping effect. Therefore, the aforementioned damping component 40 fully utilizes the linear or nonlinear elastic characteristics of the spring and optimizes the design for the impact waveform unique to the power tool 100, thereby achieving efficient capture and conversion of operational vibration energy. It converts the impact energy into the elastic potential energy of the spring and releases it gradually, rather than simply buffering it. This reduces the residual vibration felt by the user to an extremely low level, almost achieving a "perceptible" operation, resulting in a qualitative leap in user experience.

[0038] like Figure 7 , Figure 8 As shown, in the second embodiment of this application, the first connector 41 can also be specifically implemented as a metal tube with a generally circular tubular structure, which is also fastened to the motor housing 12 by bolts. The second connector 42 can also be specifically implemented as a metal tube with a generally circular tubular structure, the diameter of which can be smaller than the diameter of the first connector 41. The front end of the second connector 42 is also inserted into the rear end of the first connector, and its rear end is also fastened to the handle housing 30 by bolts.

[0039] In this embodiment, in the axial support structure for axially supporting the first connector 41 and the second connector 42, the first working part configured with the first connector 41 in the form of force transmission is a stepped surface 411 formed on the outer periphery of the first connector 41, and the second working part configured with the second connector 42 in the form of force transmission is a collar 49 fixedly sleeved on the outer periphery of the second connector 42. The elastic element 43 can be specifically implemented as a spring, which is sleeved on the outer periphery of the first connector 41. The front end of the elastic element 43 presses forward against the stepped surface 411, and its rear end presses backward against the collar 49. The force transmission path between the power housing 10 and the handle housing 30, from front to back, includes the power housing 10, the first connector 41, the elastic element 43, the collar 49, the second connector 42, and the handle housing 30.

[0040] In this embodiment, from an ergonomic perspective, to prevent the handle housing 30 from wobbling even when not in use, an axial limiting structure is used to ensure that the elastic element 43 is initially compressed. This axial limiting structure is a damping spring 410 disposed between the first connecting member 41 and the second connecting member 42. The damping spring 410 is located within the annular space formed by the first connecting member 41 and the second connecting member 42, housed inside the first connecting member 41 and sleeved on the outer periphery of the second connecting member 42. Both the rear end of the first connecting member 41 and the front end of the second connecting member 42 have receiving surfaces. The front end of the damping spring 410 presses forward against the front end of the second connecting member 42, and the rear end of the damping spring 410 presses backward against the rear end of the first connecting member 41. Under the force of the damping spring 410, the power tool 100 drives the power housing 10 and the handle housing 30 closer together, thus the elastic element 43 is compressed under the action of the damping spring 410.

[0041] In this embodiment, the radial support structure between the first connector 41 and the second connector 42 is also achieved by interlocking the two to prevent relative displacement in the radial direction. The circumferential support structure between the first connector 41 and the second connector 42 is achieved by utilizing the anti-torsional deformation characteristics of the elastic element 43. The front end of the elastic element 43 is circumferentially fixed to the first connector 41, and the rear end is circumferentially fixed to the collar 49. When the power housing 10 generates torsional vibration, the elastic element 43 can convert the energy of the torsional vibration into its own torsional elastic potential energy, thereby preventing the torsional vibration from being transmitted to the handle housing 30.

[0042] In this embodiment, when the power tool 100 is in operation, the axial vibration generated by the impact mechanism 23 is isolated by the elastic element 43, and its working principle is the same as that of the first embodiment described above. Furthermore, the working principle of the first connector 41 and the second connector 42, which are connected by a plug-in joint, is also the same as that of the first embodiment described above. When damping vibrations in the circumferential direction, the working principle of this embodiment differs from that of the first embodiment. In this embodiment, the circumferential vibration generated by the impact mechanism 23 is absorbed by utilizing the anti-torsional deformation characteristics of the elastic element 43, converting the circumferential vibration energy into the anti-torsional deformation potential energy of the elastic element 43, thereby preventing the circumferential vibration from being transmitted to the handle housing 30.

[0043] like Figure 9 , Figure 10 As shown, in the third embodiment of this application, the first connector 41 can also be specifically implemented as a metal tube with a generally circular tubular structure, which is also fastened to the motor housing 12 by bolts. The second connector 42 can also be specifically implemented as a metal tube with a generally circular tubular structure, the diameter of which can be smaller than the diameter of the first connector 41. The front end of the second connector 42 is also inserted into the rear end of the first connector 41, and its rear end is also fastened to the handle housing 30 by bolts.

[0044] In this embodiment, in the axial support structure for supporting the first connector 41 and the second connector 42 in the axial direction, the first functional part configured with the first connector 41 in the form of force transmission is a locking sleeve 420 fixedly disposed on the inner wall of the first connector 41, and the second functional part configured with the second connector 42 in the form of force transmission is the front end face of the second connector 42. In this embodiment, the locking sleeve 420 has a generally annular structure, and its outer wall is fixedly connected to the inner wall of the first connector 41 by an interference fit. The elastic element 43 can be specifically implemented as a spring, which is housed inside the first connector 41, and the front end of the elastic element 43 abuts against the rear end face of the locking sleeve 420, and the rear end of the elastic element 43 abuts against the front end face of the second connector 42. The force transmission path between the power housing 10 and the handle housing 30, from front to back, includes the power housing 10, the first connector 41, the locking sleeve 420, the elastic element 43, the second connector 42, and the handle housing 30.

[0045] In this embodiment, the position of the damping spring 410 is the same as in the second embodiment, also disposed within the annular space formed by the first connecting member 41 and the second connecting member 42. It is housed inside the first connecting member 41 and sleeved on the outer periphery of the second connecting member 42. The function of the damping spring 410 is also based on ergonomics. By having the elastic element 43 in a compressed state under the action of the damping spring 410, the handle housing 30 is prevented from shaking when not in operation.

[0046] In this embodiment, the radial support structure between the first connector 41 and the second connector 42, like in the second embodiment, prevents relative displacement in the radial direction through their interlocking. The circumferential support structure between the first connector 41 and the second connector 42, like in the second embodiment, utilizes the anti-torsional deformation characteristics of the elastic element 43. When the power tool 100 is in operation, the axial vibration generated by the impact mechanism 23 is isolated by the elastic element 43, and its working principle is the same as in the second embodiment. Furthermore, the interlocking mechanism of the first connector 41 and the second connector 42 in this embodiment also operates on the same principle as in the second embodiment. When damping circumferential vibration, the working principle of this embodiment is also the same as in the second embodiment. Utilizing the anti-torsional deformation characteristics of the elastic element 43, the circumferential vibration generated by the impact mechanism 23 is absorbed, converting the circumferential vibration energy into the anti-torsional deformation potential energy of the elastic element 43, thereby preventing the circumferential vibration from being transmitted to the handle housing 30.

[0047] like Figure 11 , Figure 12 As shown, in the fourth embodiment of this application, the first connector 41 can also be specifically implemented as a metal tube with a generally circular tubular structure, which is also fastened to the motor housing 12 by bolts. The second connector 42 can also be specifically implemented as a metal tube with a generally circular tubular structure, the diameter of which can be larger than the diameter of the first connector 41. The rear end of the first connector 41 is inserted into the front end of the second connector 42, and the rear end of the second connector 42 is fastened to the handle housing 30 by bolts.

[0048] In this embodiment, in the axial support structure for supporting the first connector 41 and the second connector 42 in the axial direction, the first working part configured with the first connector 41 in the form of force transmission is a stepped surface formed on the outer periphery of the first connector 41 or the outer surface of the power housing 10, and the second working part configured with the second connector 42 in the form of force transmission is the front end face of the second connector 42. In this embodiment, the elastic element 43 can be specifically implemented as a spring, which is sleeved on the outer periphery of the first connector 41. The front end of the elastic element 43 can abut against the stepped surface formed on the outer wall of the first connector 41 or the outer surface of the power housing 10, and its rear end can abut against the front end face of the second connector 42. The force transmission path between the power housing 10 and the handle housing 30, from front to back, includes the power housing 10, the first connector 41, the elastic element 43, the second connector 42, and the handle housing 30.

[0049] In this embodiment, the radial support structure between the first connector 41 and the second connector 42 is the same as in the first, second, and third embodiments described above, where they are interlocked to prevent relative displacement in the radial direction. The circumferential support structure between the first connector 41 and the second connector 42 differs from the aforementioned embodiments. This circumferential support structure includes a first guide ball track 430 formed on the outer wall of the first connector 41, a second guide ball track 440 formed on the second connector 42, and a guide steel ball 450 embedded in both the first guide ball track 430 and the second guide ball track 440. When a circumferential rotational displacement occurs between the first connector 41 and the second connector 42, the guide steel ball 450 rolls along the tracks of the mutually inclined first guide ball track 430 and the second guide ball track 440, thereby causing relative axial displacement between the first connector 41 and the second connector 42, which in turn changes the axial deformation of the elastic element 43. With this configuration, the circumferential vibration generated by the impact mechanism 23 can be absorbed by the compression deformation of the elastic element 43, and the energy of the circumferential vibration can be converted into the compression deformation potential energy of the elastic element 23, thereby preventing the circumferential vibration from being transmitted to the handle housing 30.

[0050] When the power tool 100 is in operation, the axial vibration generated by the impact mechanism 23 can be largely converted into the elastic potential energy of the compression spring. During this process, the energy of the axial vibration is dissipated and dispersed by internal damping, thereby preventing the axial vibration from being transmitted to the handle housing 30. In addition, the circumferential vibration generated by the impact mechanism 23 can also be converted into the elastic potential energy of the compression spring under the guidance of the circumferential support structure provided between the first connector 41 and the second connector 42, thereby also preventing the circumferential vibration from being transmitted to the handle housing 30.

[0051] In the above embodiments of this application, a spring is used to connect the power housing 10 and the handle housing 30 of the power tool 100. By simultaneously setting an axial support structure, a radial support structure, and a circumferential support structure between the first connector 41 and the second connector 42, the impact kinetic energy and vibration generated by the impact mechanism 23 in the power housing 10 are greatly absorbed and dissipated. The original rigid connection is transformed into a flexible spring connection, which fundamentally cuts off the direct transmission path of vibration, reducing the vibration amplitude transmitted to the upper part to an extremely low level. This greatly improves the user's operating feel and effectively alleviates hand and body fatigue.

[0052] See Figure 1The 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 the horizontal position, and then place it vertically for operation.

[0053] See Figure 1 The power tool 100 also includes a power supply 60 that provides electrical energy to the aforementioned motor 21. 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.

[0054] 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, the handle housing being for a user to grip; A shock-absorbing assembly is disposed between the power housing and the handle housing; The shock absorption assembly includes a first connector connected to the power housing, a second connector connected to the handle housing, and an elastic element disposed between the first connector and the second connector. The first connector is supported by the second connector, and the two can generate relative displacement to change the deformation of the elastic element.

2. The power tool according to claim 1, characterized in that, The first connector and the second connector also have a radial support structure to prevent radial displacement between the first connector and the second connector.

3. The power tool according to claim 2, characterized in that, One of the first connector and the second connector is inserted into the other in the axial direction so that the first connector and the second connector provide radial support to each other.

4. The power tool according to claim 3, characterized in that, The first connector and the second connector have an axial support structure so that the deformation of the elastic element in the axial direction can be changed when the first connector and the second connector are axially displaced.

5. The power tool according to claim 4, characterized in that, The axial support structure includes a first working part that can transmit force with the first connecting member and a second working part that can transmit force with the second connecting member. One end of the elastic element is connected to the first working part and the other end is connected to the second working part.

6. The power tool according to claim 5, characterized in that, The first functional part includes a first pin inserted into the inner wall of the first connector and a first washer abutting against the first pin. The second functional part includes a second washer abutting against the end face of the second connector. One end of the elastic element is connected to the first washer and the other end is connected to the second washer.

7. The power tool according to claim 5, characterized in that, The first functional part is a stepped surface formed on the outer periphery of the first connector, and the second functional part includes a collar fixedly sleeved on the second connector. One end of the elastic element is connected to the stepped surface and the other end is connected to the collar.

8. The power tool according to claim 5, characterized in that, The first functional part includes a locking sleeve fixedly disposed on the inner wall of the first connector, the second functional part is the front end face of the second connector, one end of the elastic element is engaged with the locking sleeve, and the other end is engaged with the front end face of the second connector.

9. The power tool according to claim 5, characterized in that, The first functional part is a stepped surface formed on the outer periphery of the first connector, the second functional part is the front end face of the second connector, one end of the elastic element is connected to the stepped surface, and the other end is connected to the front end face of the second connector.

10. The power tool according to claim 3, characterized in that, An axial limiting structure is also provided between the first connector and the second connector, and the axial limiting structure acts on the first connector and the second connector to make the elastic element in a compressed state.

11. The power tool according to claim 10, characterized in that, The axial limiting structure includes a second pin inserted into the inner wall of the first connector and a strip-shaped through hole formed in the side wall of the first connector and extending along the axial direction. The second pin is inserted into the strip-shaped through hole. The axial displacement between the first connector and the second connector is limited by the extension length of the strip-shaped through hole, so that the elastic element is in a compressed state.

12. The power tool according to claim 10, characterized in that, The axial limiting structure includes a damping spring, one end of which presses against the first connecting member to the rear, and the other end of which presses against the second connecting member to the front, so that the first connecting member and the second connecting member move closer to each other and compress the elastic element.

13. The power tool according to claim 10, characterized in that, The axial limiting structure includes a steel ball embedded in the first connector and a ball track formed in the second connector. The steel ball rolls into the ball track and restricts the axial displacement between the first connector and the second connector, so that the elastic element is in a compressed state.

14. The power tool according to claim 3, characterized in that, The first connector and the second connector also have a circumferential support structure to limit the rotational displacement of the first connector and the second connector in the circumferential direction.

15. The power tool according to claim 14, characterized in that, The circumferential support structure includes a first connector and a second connector with a square cross-section. The first connector and the second connector are shaped to fit each other so that they provide circumferential support.

16. The power tool according to claim 14, characterized in that, The circumferential support structure includes a first fixed connection portion that can fixably connect the first connector to one end of the elastic element, and a second fixed connection portion that can fixably connect the second connector to the other end of the elastic element. When the first connector and the second connector generate circumferential displacement, the deformation of the elastic element in the circumferential direction can be changed.

17. The power tool according to claim 14, characterized in that, The circumferential support structure includes a first guide ball track formed on the first connector, a second guide ball track formed on the second connector, and a guide steel ball embedded in both the first and second guide ball tracks. The first and second guide ball tracks are inclined and roll in cooperation with the guide steel ball, so that when the first and second connectors undergo circumferential displacement, the guide steel ball can push the first and second connectors to undergo relative axial displacement and change the deformation of the elastic element in the axial direction.

18. 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, the output shaft being rotatably supported on the power housing and protruding from one end of the power housing, and a first connector being provided at the other end of the power housing; A handle housing extends along the axial direction of the output shaft, and a second connector is provided at one end of the handle housing facing the power housing. The second connector is movably supported by the first connector. in, An elastic element is also provided between the first connector and the second connector; When a relative displacement occurs between the power housing and the handle housing, the deformation of the elastic element changes.

19. The power tool according to claim 18, characterized in that, The first connector is fastened to the power housing, and the second connector is fastened to the handle housing. One of the first connector and the second connector is movably inserted into the other in the axial direction.

20. The power tool according to claim 19, characterized in that, One end of the elastic element presses against the first connector, and the other end presses against the second connector.

21. 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, the output shaft being rotatably supported on the power housing and protruding from one end of the power housing, and a first connector extending from the other end of the power housing; A handle housing extends along the axial direction of the output shaft, and a second connector extends from one end of the handle housing toward the power housing, the second connector being movably supported by the first connector; in, An elastic element is also provided between the first connector and the second connector; When a relative displacement occurs between the power housing and the handle housing, the deformation of the elastic element changes.

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