An impact wrench

Abstract

The application provides an impact wrench, comprising: a striking block body for transmitting torque; a telescopic mechanism connected with the striking block body; and an adjusting mechanism connected with the telescopic mechanism, the adjusting mechanism being used for adjusting the relative distance between the telescopic mechanism and the rotation center of the striking block body, so that the torque transmitted by the striking block body is changed. The impact wrench provided by the application has the striking block comprising the striking block body and the telescopic mechanism, the relative distance between the telescopic mechanism and the rotation center of the striking block body can be changed, the rotational inertia of the striking block is variable, the torque of the impact wrench is variable, and the same impact wrench can output different torques.

Description

Technical Field

[0001] This application relates to the field of machine tool technology, and in particular to an impact wrench. Background Technology

[0002] Most existing impact wrenches are torque-controlled impact wrenches with a single, integrated striking block. When fasteners such as bolts require low torque, using a high-torque impact wrench can easily overtighten them, making disassembly difficult. Furthermore, using excessively high-torque impact wrenches consumes more power, leading to faster battery drain and poor wrench endurance. Conversely, when fasteners require high torque, a low-torque impact wrench will fail to tighten them. Therefore, for applications requiring varying output torque, multiple torque-controlled impact wrenches must be readily available for interchangeability, which is inconvenient. Summary of the Invention

[0003] In view of this, this application provides an impact wrench to solve the problem of difficulty in changing the torque of existing impact wrenches.

[0004] This application provides an impact wrench, including:

[0005] The striking block body is used to transmit torque;

[0006] The telescopic mechanism is connected to the main body of the striking block;

[0007] An adjustment mechanism is connected to the telescopic mechanism. The adjustment mechanism is used to adjust the relative distance between the telescopic mechanism and the rotation center of the striking block body, so as to change the torque transmitted by the striking block body.

[0008] In one alternative embodiment, the adjusting mechanism includes at least two movable guide grooves, wherein the distance between any point in the movable guide groove and the rotation center varies about the rotation center;

[0009] The telescopic mechanism includes at least two telescopic blocks that are rotationally symmetrical about the rotation center and correspond one-to-one with the moving guide groove, and the telescopic blocks are at least partially inserted into the moving guide groove;

[0010] When the adjustment mechanism is subjected to a rotational external force, it drives the telescopic block to move along the moving guide groove, and when the telescopic block moves along the moving guide groove to different positions, the relative distance at least at two positions is different.

[0011] In an optional embodiment, the striking block body includes telescopic guide grooves that correspond one-to-one with the telescopic blocks, wherein any point in the telescopic guide groove is at a different distance from the rotation center, and the telescopic block is at least partially inserted into the telescopic guide groove;

[0012] As the telescopic block moves along the guide groove, it also moves along the telescopic guide groove.

[0013] In one alternative embodiment, the telescopic block includes:

[0014] The telescopic main body is located on the outside of the main body of the striking block;

[0015] A slider is connected to the telescopic body, and the slider is inserted into the telescopic guide groove;

[0016] A protrusion is connected to the slider and inserted into the movable guide groove.

[0017] In an optional embodiment, the impact wrench further includes a retaining ring, wherein the retaining ring is respectively installed at both ends of the movable guide groove, and one side of the retaining ring has a notch for the telescopic mechanism to enter and exit, and the retaining ring is used to clamp the telescopic mechanism.

[0018] In an alternative embodiment, the adjustment mechanism includes a detachably connected first part and a second part, the first part having a first clearance notch and the second part having a second clearance notch, the first clearance notch and the second clearance notch together forming a clearance hole through which the striking block body passes.

[0019] In one alternative embodiment, the striking block body has a circumferential limiting groove, the adjusting mechanism is at least partially located within the limiting groove, and the telescopic guide groove is located on one side wall of the limiting groove and communicates with the limiting groove.

[0020] In one alternative embodiment, the impact wrench further includes: a housing and an adjusting roller;

[0021] The housing has an opening on one side, and the adjusting roller is installed in the opening and partially protrudes from the outside of the housing;

[0022] The adjusting mechanism and the adjusting roller have matching teeth, and the adjusting roller can drive the adjusting mechanism to rotate when it rotates.

[0023] In an optional embodiment, the impact wrench further includes:

[0024] A return spring is provided, and the adjusting roller is connected to the housing via the return spring. When the return spring is deformed, the adjusting roller engages with the adjusting mechanism, and when the return spring is restored, the adjusting roller disengages from the adjusting mechanism.

[0025] In one alternative embodiment, the adjustment mechanism includes an adjustment disc, which is coaxial with the main body of the striking block.

[0026] The impact wrench provided in this application embodiment includes an impact block body and a telescopic mechanism. The relative distance between the telescopic mechanism and the rotation center of the impact block body can be changed, thereby making the moment of inertia of the impact block variable. This makes the torque of the impact wrench variable, enabling the same impact wrench to output different torques.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 A cross-sectional structural schematic diagram of the impact wrench provided in the embodiments of this application;

[0030] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0031] Figure 3 An exploded view of the impact wrench provided in the embodiments of this application;

[0032] Figure 4 This is a schematic diagram illustrating the cooperation relationship between the telescopic mechanism and the adjusting mechanism provided in the embodiments of this application;

[0033] Figure 5 This is a schematic diagram of the retracted state of the telescopic mechanism provided in the embodiments of this application;

[0034] Figure 6 This is a schematic diagram of the telescopic mechanism in its extended state provided in an embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the retaining ring structure provided in an embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the adjusting roller structure provided in an embodiment of this application;

[0037] Figure 9 This is a schematic diagram of the adjustment disc structure provided in an embodiment of this application;

[0038] Figure 10 for Figure 9 A sectional view.

[0039] The attached figures are labeled as follows:

[0040] 1. Strike the main body of the block;

[0041] 2. Output shaft;

[0042] 3. Telescopic mechanism;

[0043] 4. Adjustment mechanism;

[0044] 5. Outer casing;

[0045] 6. Adjust the rollers;

[0046] 7. Return spring;

[0047] 11. Telescopic guide groove;

[0048] 12 limit slots;

[0049] 31. Expansion block;

[0050] 310 telescopic main body;

[0051] 41. Adjustment dial;

[0052] 42. Snap ring;

[0053] 51. Opening;

[0054] 311 Slider;

[0055] 312 bumps;

[0056] 401 Part 1;

[0057] 402 Part 2;

[0058] 403 clearance hole;

[0059] 411 Moving guide groove;

[0060] 413 tooth;

[0061] 421 gap. Detailed Implementation

[0062] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the disclosure of the present application to those skilled in the art.

[0063] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, to avoid confusion with this application, some technical features well-known in the art have not been described; that is, not all features of actual embodiments are described herein, nor are well-known functions and structures described in detail.

[0064] In the accompanying drawings, for clarity, the dimensions of layers, areas, and elements, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0065] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0066] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0067] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0068] The existing impact wrench works by using a striking block to continuously strike the output shaft, causing the output shaft to rotate. One process involves converting the rotational inertia of the striking block into the rotational inertia of the output shaft. Since the rotational inertia of a single striking block is fixed and cannot be changed during use, the impact wrench is designed to be used in a fixed manner.

[0069] This embodiment provides an impact wrench, such as Figure 1 , Figure 2 As shown, it includes: striking block body 1, output shaft 2, telescopic mechanism 3, and adjustment mechanism 4.

[0070] The striking block body 1 is used to transmit torque. Specifically, it converts its own kinetic energy into the kinetic energy of the output shaft 2 of the impact wrench by striking the output shaft 2, and then uses the head of the output shaft 2 to tighten components such as screws. A telescopic mechanism 3 is connected to the striking block body 1; an adjusting mechanism 4 is connected to the telescopic mechanism 3. The adjusting mechanism 4 is used to adjust the relative distance between the telescopic mechanism 3 and the rotation center of the striking block body 1, thereby changing the torque transmitted by the striking block body 1. Specifically, for example... Figures 2-4 As shown, the telescopic mechanism 3 includes four telescopic blocks 31 that are rotationally symmetrical about the rotation center; the adjustment mechanism 4 includes an adjustment disk 41, which is coaxial with the striking block body 1. The adjustment disk 41 is disposed on one side of the telescopic block 31, and the adjustment disk 41 is provided with a moving guide groove 411 corresponding to the telescopic block 31. The distance between any point in the moving guide groove 411 and the rotation center varies around the rotation center.

[0071] like Figures 3-6 As shown, the telescopic block 31 includes a telescopic body 310, a slider 311, and a protrusion 312. The telescopic body 310 is located outside the striking block body 1. The slider 311 is connected to the telescopic body 310, and the protrusion 312 is connected to the slider 311 and inserted into the corresponding moving guide groove 411. The telescopic block 31 moves along the telescopic guide groove 11 by the slider 311 being inserted into the telescopic guide groove 11, and the telescopic block 31 moves along the moving guide groove 411 by the protrusion 312 being inserted into the moving guide groove 411.

[0072] like Figure 3As shown, the striking block body 1 includes telescopic guide grooves 11 corresponding one-to-one with the sliders 311. The sliders 311 are inserted into the telescopic guide grooves 11, and the distance between any point in the telescopic guide groove 11 and the rotation center is different. The sliders 311 are slidably disposed in the telescopic guide grooves 11. When the sliders 311 slide along the telescopic guide grooves 11, the distance between the telescopic block 31 and the rotation center of the striking block body 1 can change. The principle of this structure is that one end of the telescopic guide groove 11 is close to the rotation center of the striking block body 1, and the other end is away from the rotation center of the striking block body 1. In this way, when the sliders 311 slide along the telescopic guide grooves 11, the telescopic blocks 31 can move closer to or away from the rotation center of the striking block body 1. With the motor speed remaining constant, the telescopic blocks 31 with constant mass moving away from or closer to the rotation center will cause their moment of inertia to increase or decrease.

[0073] When the adjusting mechanism 4 is subjected to a rotational force, it drives the telescopic block 31 to move along the moving guide groove 411. When the telescopic block 31 moves to different positions along the moving guide groove 411, the relative distance between at least two positions is different. During the movement of the telescopic block 31 along the moving guide groove 411, it simultaneously moves along the telescopic guide groove 11. Since the movement of the telescopic block 31 is simultaneously restricted by two different grooves, when the adjusting mechanism 4 with the moving guide groove 411 is subjected to a rotational force, it forces the telescopic block 31 to move along both the moving guide groove 411 and the telescopic guide groove 11, ultimately causing the telescopic block 31 to move closer to or further away from the rotation center.

[0074] The impact wrench provided in this embodiment differs from existing impact wrenches. The impact block includes an impact block body 1 and a telescopic mechanism 3. The relative distance between the telescopic mechanism 3 and the rotation center of the impact block body 1 can be changed. This configuration makes the moment of inertia of the impact block variable, thus making the torque of the impact wrench variable, enabling the same impact wrench to output different torques. The telescopic mechanism 3 refers to a structure that can extend (away from) or retract (closer to) relative to the rotation center of the impact block body 1; the adjusting mechanism 4 refers to a structure that can drive the telescopic mechanism 3 to extend or retract. Therefore, extending or retracting the telescopic mechanism 3 increases or decreases the moment of inertia of the impact block body 1, thereby increasing or decreasing the torque output by the output shaft 2. In this scheme, the moving guide groove 411 acts to push the telescopic block 31 to move when the adjusting mechanism 4 is subjected to a rotational external force. When the telescopic block 31 moves to different positions along the moving guide groove 411, the relative distance between at least two positions is different, which means that the telescopic mechanism 3 in this embodiment has at least two moments of inertia, i.e., the impact wrench in this embodiment has at least two switchable torques. It should be noted that in this embodiment, the impact block body 1 is generally connected to and driven by the motor, and the overall speed of the motor (referring to the equivalent speed within a certain period, such as revolutions per second) remains constant. Since the impact wrench in this embodiment can adjust the output torque, a low torque setting can be used for fasteners with low torque requirements to reduce battery consumption; while a high torque setting can be used for fasteners with high torque requirements to increase the output torque and ensure smooth installation of the fasteners.

[0075] The impact wrench in this embodiment, such as Figures 2-4 As shown, the working principle of the adjustment disk 41 is as follows: a movable guide groove 411 is opened along one side of the adjustment disk 41, and the protrusion 312 protruding from one side of the telescopic block 31 is inserted into the movable guide groove 411. Under this structure, after the operator rotates the adjustment disk 41, for a telescopic block 31, its protrusion 312 will move from one end of the movable guide groove 411 to the other end of the movable guide groove 411. For the protrusion 312, it is also necessary to simultaneously move from one end of the telescopic guide groove 11 to the other end. Therefore, the adjustment disk 41 in this embodiment can adjust the distance between the telescopic block 31 and the rotation center of the striking block body 1.

[0076] Optionally, the impact wrench in this embodiment, such as Figures 2-4 As shown, the adjustment mechanism 4 is configured as four rotating guide grooves 411 that are rotationally symmetrical to each other;

[0077] The telescopic mechanism 3 is provided with four telescopic blocks 31 that correspond one-to-one with the moving guide groove 411.

[0078] Specifically, in this embodiment, as follows: Figure 3As shown, when the four telescopic blocks 31 retract, they retract as follows: Figure 5 As shown, a circular ring is formed, and the four telescopic blocks 31 extend as follows: Figure 6 As shown, this forms a ring with gaps but a larger diameter. This alternative arrangement improves the symmetry of the telescopic block 31, maintaining the overall structure of the rotating body and ensuring stability when the wrench motor is started.

[0079] Optionally, the telescopic guide groove 11 extends radially, and the multiple telescopic guide grooves 11 are rotationally symmetrical about the rotation center of the striking block body 1. The moving guide groove 411 cannot be parallel or perpendicular to the corresponding telescopic guide groove 11, and the angle between the moving guide groove 411 and the telescopic guide groove 11 can be selected as 45 degrees, 135 degrees, 30 degrees, or 150 degrees. In this scheme, the radially extending structure of the telescopic guide groove 11 can convert the entire moving distance of the telescopic block 31 into a distance away from the rotation center, resulting in higher efficiency in the operation of the adjusting disc 41. The above selection of the angle between the moving guide groove 411 and the telescopic guide groove 11 ensures the transmission effect of the adjusting disc 41.

[0080] Optionally, the impact wrench in this embodiment, such as Figure 3 , Figure 7 As shown, the adjustment mechanism 4 also includes a retaining ring 42, which is installed at both ends of the moving guide groove 411. One side of the retaining ring 42 has a notch 421 for the protrusion 312 to engage, and the width of the notch 421 is smaller than the width of the protrusion 312. Specifically, in this embodiment, the retaining ring 42 is made of a material capable of elastic deformation. The principle of the retaining ring 42 engaging the protrusion 312 is as follows: since the width of the notch 421 is smaller than the width of the protrusion 312, when the operator rotates the adjustment disc 41 with external force to make the notch 421 for the protrusion 312 engage into the retaining ring 42, the retaining ring 42 undergoes elastic deformation and has a force that squeezes inward. This squeezing force can hold the protrusion 312, making the protrusion 312 clamp and position it, that is, fixing the distance between the telescopic block 31 and the rotation center, and finally realizing the selection of the torque of the impact wrench in this embodiment. Optionally, the protrusion 312 is cylindrical and the retaining ring 42 is annular for fit.

[0081] For example, the two ends of the movable guide groove 411 are respectively referred to as the proximal end near the center of rotation and the distal end far from the center of rotation. Figure 5 An illustrative illustration shows the protrusion 312 located at the proximal end of the movable guide groove 411. In this position, the impact wrench can operate at a preset torque. Under the action of the retaining ring 42 located at the proximal end of the movable guide groove 411, the protrusion 312 can be effectively held at the proximal end. Therefore, when the adjusting mechanism 4 is not adjusting, the impact wrench can better maintain its operating state at the preset torque output. Similarly, Figure 6 An illustrative illustration shows the protrusion 312 located at the distal end of the movable guide groove 411. At this point, the torque output by the impact wrench is higher than the preset torque. Under the action of the retaining ring 42 located at the distal end of the movable guide groove 411, the protrusion 312 can be effectively held at the distal end. Therefore, when the adjusting mechanism 4 is not adjusting, the impact wrench can better maintain a working state with a torque higher than the preset torque. It is understood that if the preset torque is referred to as low (or small) torque, then a torque higher than the preset torque can be referred to as high (or large) torque.

[0082] The following provides a method for using the adjustment mechanism 4 in this embodiment:

[0083] When the impact wrench needs to be adjusted from low torque to high torque: Rotating the adjusting disc 41 clockwise causes each telescopic block 31 of the telescopic mechanism 3 to be simultaneously constrained by the moving guide groove 411 and the telescopic guide groove 11, gradually moving away from the rotation center of the impact block body 1. Under the action of the retaining ring 42, as... Figure 6 As shown, each telescopic block 31 is fixed to one end of the moving guide groove 411 away from the rotation center of the impact block body 1. The rotational inertia of the telescopic mechanism 3 increases, and then the impact wrench can be started to begin operation.

[0084] When the impact wrench needs to be adjusted from high torque to low torque: Turn the adjusting disc 41 counterclockwise. Each telescopic block 31 of the telescopic mechanism 3 is simultaneously constrained by the moving guide groove 411 and the telescopic guide groove 11, gradually approaching the rotation center of the impact block body 1. Under the action of the retaining ring 42, as... Figure 5 As shown, each telescopic block 31 is fixed at one end of the movable guide groove 411 near the rotation center of the impact block body 1. The rotational inertia of the telescopic mechanism 3 is reduced, and then the impact wrench can be started to begin operation.

[0085] Optionally, the impact wrench in this embodiment, such as Figure 9 , Figure 10As shown, the adjusting disc 41 includes a first part 401 and a second part 402 that are spliced ​​together. The first part 401 and the second part 402 are connected by corresponding slots and teeth 413. The first part 401 has a first clearance notch, and the second part 402 has a second clearance notch. The first clearance notch and the second clearance notch together form a clearance hole 403 for the striking block body 1 to pass through. In this embodiment, the striking block body 1 has a circumferential limiting groove 12. The adjusting mechanism 4 is partially located in the limiting groove 12, and the telescopic guide groove 11 is located on one side wall of the limiting groove 12 and communicates with the limiting groove 12. The adjusting disc 41 needs to be fitted into the limiting groove 12 to axially limit the adjusting disc 41. To facilitate the actual installation of the adjustment disc 41, the adjustment disc 41 is first divided into a first part 401 and a second part 402, so that the striking block body 1 can be easily inserted into the clearance hole 403, and then the first part 401 and the second part 402 of the adjustment disc 41 are assembled at the position of the limiting groove 12.

[0086] Optionally, the impact wrench in this embodiment, such as Figure 7 , Figure 9 As shown, the width at both ends of the movable guide groove 411 is greater than its width in the middle, and the area where the notch 421 of the retaining ring 42 is located occupies one-quarter to one-third of the total area of ​​the retaining ring 42. The wider width at both ends of the movable guide groove 411 facilitates the installation of the retaining ring 42. Ideally, the width of the notch 421 of the retaining ring 42 should be equal to or slightly smaller than the width in the middle of the movable guide groove 411. When the area where the notch 421 of the retaining ring 42 occupies one-quarter to one-third of the total area of ​​the retaining ring 42, it ensures that the retaining ring 42 is easily opened and can provide a relatively large compressive force. Furthermore, for the material of the retaining ring 42, a material with a high coefficient of surface friction and good elasticity, such as rubber, can be selected.

[0087] Optionally, the impact wrench in this embodiment, such as Figure 3 As shown, it also includes: a housing 5 and an adjusting roller 6; one side of the housing 5 has an opening 51, and the adjusting roller 6 is installed in the opening 51 and partially protrudes from the outside of the housing 5;

[0088] The adjusting disk 41 and the adjusting roller 6 have matching teeth, and the adjusting roller 6 can drive the adjusting disk 41 to rotate when it rotates.

[0089] This optional design improves the operability of the adjustment disc 41. Using the adjustment roller 6, the adjustment disc 41 inside the housing 5 can be adjusted from the outside of the housing 5. Both the adjustment disc 41 and the adjustment roller 6 are gears; through the meshing of the gears, the operator can rotate the adjustment disc 41 simply by rolling the adjustment roller 6.

[0090] Optionally, in this embodiment of the impact wrench, the adjusting roller 6 is movably connected to the housing 5, such as... Figure 3 , Figure 8 As shown, the adjusting roller 6 is connected to the housing 5 via a return spring 7. When the return spring 7 deforms, the adjusting roller 6 engages with the adjusting disc 41; when the return spring 7 returns to its original position, the adjusting roller 6 separates from the adjusting disc 41. Specifically, one end of the return spring 7 is fixed to the inner wall of the housing 5, and the other end is connected to the shaft of the adjusting roller 6. The shaft of the adjusting roller 6 has a certain amount of room for movement within the housing 5. In this optional solution, the function of the return spring 7 is to separate the adjusting roller 6 from the adjusting disc 41 under normal conditions. This allows the operator to separate the adjusting roller 6 after adjusting the adjusting disc 41. This prevents the adjusting roller 6 from rotating when the impact wrench motor starts and other components such as the adjusting disc 41 rotate, thus avoiding prolonged rotation of the adjusting roller 6 and reducing its service life.

[0091] Optionally, in this embodiment of the impact wrench, the movable guide groove 411 is arc-shaped or straight. This design makes the driving process of the adjustment disc 41 on the telescopic block 31 smoother, improving the feel during operation.

[0092] This embodiment provides a torque adjustment method for an impact wrench. Using the aforementioned impact wrench, the method includes:

[0093] A telescopic mechanism 3 is connected to the striking block body 1 of the impact wrench, and the distance between the telescopic mechanism 3 and the rotation center of the striking block body 1 is adjusted by the adjustment mechanism 4.

[0094] The torque adjustment method for the impact wrench provided in this embodiment includes an impact block body 1 and a telescopic mechanism 3. The distance between the telescopic mechanism 3 and the rotation center of the impact block body 1 is adjusted by an adjustment mechanism 4. This setting makes the rotational inertia of the impact block variable, which in turn makes the torque of the impact wrench variable, thus realizing the torque adjustment of the impact wrench.

[0095] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. An impact wrench, characterized in that, include: The striking block body (1) is used to transmit torque; Telescopic mechanism (3), the telescopic mechanism includes telescopic block (31), the telescopic block (31) is connected to the striking block body (1); An adjustment mechanism (4) is connected to the telescopic mechanism (3). The adjustment mechanism (4) includes a moving guide groove (411). The distance between any point in the moving guide groove (411) and the rotation center of the striking block body (1) varies around the rotation center of the striking block body (1). The telescopic block (31) is at least partially inserted into the moving guide groove (411). The adjustment mechanism (4) is used to drive the telescopic block (31) to move along the moving guide groove (411) and adjust the relative distance between the telescopic mechanism (3) and the rotation center so as to change the torque transmitted by the striking block body (1).

2. The impact wrench according to claim 1, characterized in that, The adjustment mechanism (4) includes at least two movable guide grooves (411). The telescopic mechanism (3) includes at least two telescopic blocks (31) that are rotationally symmetrical about the rotation center and correspond one-to-one with the moving guide groove (411). When the adjustment mechanism (4) is subjected to a rotational external force, it drives the telescopic block (31) to move along the moving guide groove (411), and when the telescopic block (31) moves along the moving guide groove (411) to different positions, the relative distances at least at two positions are different.

3. The impact wrench according to claim 2, characterized in that, The striking block body (1) includes telescopic guide grooves (11) that correspond one-to-one with the telescopic block (31). The distance between any point in the telescopic guide groove (11) and the rotation center is different. The telescopic block (31) is at least partially inserted into the telescopic guide groove (11). As the telescopic block (31) moves along the moving guide groove (411), it also moves along the telescopic guide groove (11).

4. The impact wrench according to claim 3, characterized in that, The telescopic block (31) includes: The telescopic body (310) is located on the outside of the striking block body (1); A slider (311) is connected to the telescopic body (310), and the slider (311) is inserted into the telescopic guide groove (11); A protrusion (312) is connected to the slider (311) and inserted into the movable guide groove (411).

5. The impact wrench according to claim 2, characterized in that, The impact wrench further includes a retaining ring (42), which is installed at both ends of the movable guide groove (411). The retaining ring (42) has a notch (421) on one side for the telescopic mechanism (3) to enter and exit. The retaining ring (42) is used to clamp the telescopic mechanism (3).

6. The impact wrench according to claim 1, characterized in that, The adjustment mechanism (4) includes a first part (401) and a second part (402) that are detachably connected. The first part (401) has a first clearance notch, and the second part (402) has a second clearance notch. The first clearance notch and the second clearance notch together form a clearance hole (403) through which the striking block body (1) passes.

7. The impact wrench according to claim 3, characterized in that, The striking block body (1) has a circumferential limiting groove (12), the adjusting mechanism (4) is at least partially located in the limiting groove (12), and the telescopic guide groove (11) is located on one side of the limiting groove (12) and communicates with the limiting groove (12).

8. The impact wrench according to any one of claims 1-7, characterized in that, The impact wrench also includes: a housing (5) and an adjusting roller (6); The outer casing (5) has an opening (51) on one side, and the adjusting roller (6) is installed in the opening (51) and partially exposed outside the outer casing (5). The adjusting mechanism (4) and the adjusting roller (6) have matching teeth, and the adjusting roller (6) can drive the adjusting mechanism (4) to rotate when it rotates.

9. The impact wrench according to claim 8, characterized in that, The impact wrench also includes: The return spring (7) is connected to the outer shell (5) via the adjustment roller (6). When the return spring (7) is deformed, the adjustment roller (6) engages with the adjustment mechanism (4). When the return spring (7) is restored, the adjustment roller (6) separates from the adjustment mechanism (4).

10. The impact wrench according to any one of claims 1-7, characterized in that, The adjustment mechanism (4) includes an adjustment disc (41) which is coaxial with the main body (1) of the striking block.

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