Impact tool

Abstract

The utility model discloses an impact tool. The impact tool comprises a housing; a motor including a drive shaft rotating about a first axis; the output shaft is used for outputting torque outwards; the impact mechanism applies impact force to the output shaft, and the impact mechanism comprises an impact block driven by the motor and a hammer anvil matched with the impact block and impacted by the impact block; the impact tool further comprises a reinforcing piece which is arranged between the output shaft and the hammer anvil. The hammer anvil comprises a cylindrical anvil block body and a pair of end teeth which are symmetrically and radially arranged along the anvil block body, and the diameter of the anvil block body is a first size; the output shaft comprises a cylinder part, and the diameter of the cylinder part is a second size; wherein the ratio of the second size to the first size is greater than or equal to 1. By the adoption of the technical scheme, the impact tool which is small in size and long in service life can be provided.

Description

Technical Field

[0001] The present application relates to the field of power tools, and in particular to an electric tool. Background Art

[0002] Impact tools refer to tools that can output rotational motion at a certain impact frequency. Common impact tools include impact wrenches, impact screwdrivers, impact drills, etc. Impact wrenches are usually used to tighten bolts and nuts, impact screwdrivers are usually used to loosen or tighten screws, and impact drills are usually used to punch holes.

[0003] In order to output a rotational motion with a certain impact frequency, the impact tool generally includes an output component for outputting a rotational force and an impact mechanism for periodically impacting the output component.

[0004] In related technical products, the impact tool with a larger output impact torque has a larger size, which makes it inconvenient to use in narrow working conditions. In order to reduce the size of the impact tool, the output shaft size must be reduced, but reducing the output shaft size will make it difficult to ensure the strength of the impact tool and shorten the life of the impact tool.

[0005] This section provides background information related to the present application which is not necessarily prior art. Utility Model Content

[0006] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide an impact tool with a smaller size and a longer service life.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] An impact tool comprises: a housing provided with a containing space; a motor comprising a driving shaft rotating around a first axis; an output shaft for outputting torque externally; an impact mechanism for applying an impact force to the output shaft, the impact mechanism comprising an impact block driven by the motor and an anvil matched with the impact block and impacted by the impact block; the impact tool further comprises a reinforcement member, the reinforcement member being arranged between the output shaft and the anvil; the anvil comprising a cylindrical anvil body and a pair of end teeth symmetrically arranged radially along the anvil body, the diameter of the anvil body being a first size; the output shaft comprising a barrel portion, the diameter of the barrel portion being a second size; wherein the ratio of the second size to the first size is greater than or equal to 1.

[0009] In some embodiments, in the radial direction of the hammer anvil, the sum of the lengths of the anvil body and the pair of end teeth is a third dimension, and the ratio of the third dimension to the second dimension is less than or equal to 3.

[0010] In some embodiments, the reinforcing member includes a portion connected to the anvil body and the end teeth of the anvil, and extends radially outwardly of the anvil.

[0011] In some embodiments, in the axial direction of the impact tool, the thickness of the reinforcement member is less than or equal to 8 mm.

[0012] In some embodiments, the interior of the anvil includes an axially extending mounting hole, and the mounting hole extends beyond the reinforcement member in the axial direction of the impact tool.

[0013] In some embodiments, in the radial direction of the anvil, the reinforcement member includes a portion of the length of the anvil body having a fourth dimension, and the fourth dimension is greater than or equal to the second dimension.

[0014] In some embodiments, in the radial direction of the hammer anvil, the reinforcement member includes a portion of the length of the anvil body having a fourth dimension, and the fourth dimension is less than or equal to the third dimension.

[0015] In some embodiments, the anvil is integrally formed.

[0016] In some embodiments, an impact tool includes: a housing configured with a accommodating space; a motor including a drive shaft rotating around a first axis; an output shaft for outputting torque to the outside; an impact mechanism for applying an impact force to the output shaft, the impact mechanism including an impact block driven by the motor and an anvil that cooperates with the impact block and is impacted by the impact block; the anvil includes a cylindrical anvil body, the diameter of the anvil body is a first size; the output shaft includes a barrel, the diameter of the barrel is a second size; the ratio of the second size to the first size is greater than 1.1.

[0017] In some embodiments, the hammer anvil includes a pair of end teeth, which are symmetrically arranged on the anvil body in the radial direction of the hammer anvil, and together with the anvil body constitute the hammer anvil.

[0018] In some embodiments, in the radial direction of the hammer anvil, the sum of the lengths of the anvil body and the pair of end teeth is a third dimension, and the ratio of the third dimension to the second dimension is less than or equal to 3.

[0019] In some embodiments, the impact tool further includes a reinforcement member disposed between the output shaft and the anvil.

[0020] The benefit of the present application lies in that the size of the impact tool is reduced by limiting the ratio between the second size and the first size, and at the same time, a reinforcement is provided to increase the service life of the impact tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a side view of an impact wrench according to an embodiment;

[0022] Figure 2 yes Figure 1 A cross-sectional view of an impact wrench in FIG.

[0023] Figure 3 yes Figure 1 The three-dimensional exploded diagram of the motor in;

[0024] Figure 4 yes Figure 1 A stereoscopic view of the anvil and output shaft in FIG.

[0025] Figure 5 yes Figure 4 A side view of the anvil and output shaft in FIG.

[0026] Figure 6 It is a rear view of a hammer anvil according to one embodiment. DETAILED DESCRIPTION

[0027] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0028] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0029] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0030] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0031] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0032] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0034] In order to clearly explain the technical solution of this application, the following is also defined: Figure 1 Upper, lower, front and rear sides shown.

[0035] like Figure 1 to Figure 2 An impact tool of an embodiment of the present application is shown. In this embodiment, the impact tool is an impact wrench 100. It can be understood that the impact tool is a rotary tool. In other alternative embodiments, the rotary tool can be equipped with different working accessories. Through these different working accessories, the impact tool can be other impact tools such as an impact screwdriver and an impact drill.

[0036] like Figure 1The impact wrench 100 of one embodiment of the present application shown includes a power supply. The power supply is used to provide electrical energy to the impact wrench 100. In the present embodiment, the power supply includes a DC power supply 200, for example, the DC power supply 200 is a battery pack, and the battery pack cooperates with the corresponding power supply circuit to power the corresponding components in the impact wrench 100. Those skilled in the art should understand that the power supply is not limited to the scenario of using a battery pack, and can also be powered by AC power, AC power, and corresponding rectification, filtering and voltage regulation circuits to achieve power supply to the corresponding components in the machine. In the present embodiment, the DC power supply 200 is specifically configured as a battery pack, and the battery pack 200 will be used to replace the DC power supply below, but it cannot be used as a limitation to the present application.

[0037] like Figure 1 to Figure 2 As shown, the impact wrench 100 includes a housing 110, a motor 120, an output mechanism 130, a transmission mechanism 140 and an impact mechanism 150. The motor 120 includes a drive shaft 121 that rotates around a first axis 101. The motor 120 includes a stator assembly 122 and a rotor assembly 123. The rotor assembly 123 is formed or connected with the drive shaft 121 that rotates around the first axis 101. In this embodiment, the motor 120 is an inner rotor brushless motor. In other alternative embodiments, the motor 120 is an outer rotor brushless motor. For the inner rotor motor, the stator assembly 122 is sleeved on the outside of the rotor assembly 123. For the outer rotor motor, the rotor assembly 123 is sleeved on the outside of the stator assembly 122. In this embodiment, the brushless motor is set as a three-phase brushless motor. It can be understood that the motor is not limited to a three-phase brushless motor, and can also be other types of DC motors, and the above does not affect the substantive content of the present application.

[0038] The housing 110 includes a motor housing 111 for accommodating the motor 120 and an output housing 112 for accommodating at least part of the output mechanism 130, and the output housing 112 is connected to the front end of the motor housing 111. The housing 110 is also formed or connected with a grip portion 113 for user operation. The grip portion 113 and the motor housing 111 form a T-shaped or L-shaped structure, which is convenient for the user to hold and operate. A battery pack 200 is connected to one end of the grip portion 113. The battery pack 200 is detachably connected to the grip portion 113.

[0039] The output mechanism 130 includes an output shaft 131 for connecting a working accessory and driving the working accessory to rotate. A clamping assembly is provided at the front end of the output shaft 131, which can clamp corresponding working accessories, such as a screwdriver bit, a drill bit, a sleeve, etc., when implementing different functions.

[0040] The output shaft 131 is used to output power, and the output shaft 131 rotates around the output axis 102. In this embodiment, the first axis 101 coincides with the output axis 102. In other alternative embodiments, the output axis 102 is arranged at a certain angle to the first axis 101. In other alternative embodiments, the first axis 101 and the output axis 102 are arranged parallel to each other but do not coincide.

[0041] like Figures 2 to 3 As shown, the impact mechanism 150 is used to provide impact force to the output shaft 131. The impact mechanism 150 includes a main shaft 151, an impact block 152 sleeved on the outer periphery of the main shaft 151, an anvil 153 and an elastic element 154 arranged at the front end of the impact block 152. The anvil 153 is connected to the output shaft 131.

[0042] In some embodiments, the anvil 153 includes an anvil body 1531 and a pair of end teeth 1532. In the radial direction of the anvil 153, the pair of end teeth 1532 are symmetrically arranged on the anvil body 1531, and together with the anvil body 1531, constitute the anvil 153. Among them, the end teeth 1532 are second end teeth 1532, and the anvil body 1531 is cylindrical. Optionally, the anvil 153 is integrally formed, that is, the anvil body 1531 and the second end teeth 1532 are integrally formed. The output shaft 131 is formed or connected to the front end of the anvil 153. It can be understood that the anvil 153 and the output shaft 131 can be integrally formed or separate independent parts.

[0043] The impact block 152 is driven to rotate by the drive shaft 121, the anvil body 1531 cooperates with the impact block 152 and is struck by it, and the main shaft 151 connects the impact block 152 and the drive shaft 121. In some embodiments, the drive shaft 121 drives the main shaft 151, and the main shaft 151 drives the impact block 152 to rotate.

[0044] The impact block 152 includes an impact block body 1521, and a pair of first end teeth 1523 are radially symmetrically protruded from the front end surface of the impact block body 1521. The output shaft 131 extends out of the output housing 112. The impact block 152 is supported on the main shaft 151 and rotates integrally with the main shaft 151 and can slide back and forth relative to the main shaft 151 in the axial direction of the main shaft. In some embodiments, the axis of the main shaft 151 coincides with the axis of the drive shaft 121, so the impact block 152 slides back and forth and rotates relative to the main shaft 151 along the direction of the first axis 101. In some embodiments, the axis of the main shaft 151 can be parallel to the axis of the drive shaft 121 but not coincident, or the axis of the main shaft 151 is set at a certain angle to the axis of the drive shaft 121.

[0045] The elastic element 154 provides a force for the impact block 152 to approach the anvil 153. Alternatively, the elastic element 154 may be a coil spring.

[0046] During operation of the impact wrench 100, the impact block 152 rotates integrally with the main shaft 151 while reciprocating back and forth relative to the main shaft 151 along the direction of the first axis 101 at a specified stroke. A pair of first ball grooves 1522 opening forward and extending backward along the front-to-back direction are also provided on the front end surface of the impact block body 1521. A pair of V-shaped second ball grooves 1511 are also formed on the outer surface of the main shaft 151. Both the first ball groove 1522 and the second ball groove 1511 have a semicircular groove bottom. The impact mechanism 150 also includes a rolling ball 155. The rolling ball 155 spans the first ball groove 1522 and the second ball groove 1511, so that the impact block 152 is connected to the main shaft 151 and moves together. Optionally, the rolling ball 155 can be a steel ball.

[0047] In the related art, since the impact block 152 and the main shaft 151 are respectively provided with inwardly recessed V-shaped grooves, thereby forming a ball track together, the rolling ball 155 is arranged between the impact block 152 and the main shaft 151 and embedded in the ball track, so that the main shaft 151 can drive the impact block 152 to rotate through the rolling ball 155, and the impact block 152 drives the anvil 153 to rotate by cooperating with the anvil 153 to further drive the output shaft 131 to rotate.

[0048] When the impact wrench 100 is unloaded, the impact mechanism 150 does not impact, and the impact mechanism 150 plays a transmission role, transmitting the rotation of the motor 12 to the output shaft 131. When the impact wrench 100 is loaded, the rotation of the output shaft 131 is blocked. Due to the different load sizes, the output shaft 131 may reduce the speed or completely stop rotating. When the output shaft 131 completely stops rotating, the anvil 153 also stops rotating. Due to the circumferential limiting effect of the anvil 153 on the impact block 152, the impact block 152 also stops rotating, but the main shaft 151 continues to rotate, which causes the rolling ball 155 to be squeezed and move along the ball track, thereby driving the impact block 152 to produce a backward displacement along the axis of the main shaft 151, and squeezing the elastic element 154 until the anvil 153 and the impact block 152 are completely disengaged. The main shaft 151 drives the impact block 152 to rotate at a certain speed, and the elastic element 154 rebounds in the axial direction. The relative rotation speed between the impact block 152 and the anvil 153 is the rotation speed of the impact block 152. When the impact block 152 rotates to contact the anvil 153, an impact force is applied to the anvil 153. Under the action of this impact force, the output shaft 131 continues to rotate a certain angle to overcome the load, and then the output shaft 131 stops again, and the above process is repeated. Since the impact frequency is large enough, a relatively continuous impact force is generated on the output shaft 131, so that the working accessory continues to work.

[0049] The transmission mechanism 140 is configured to transmit the torque output by the drive shaft 121 to the output shaft 131. In the present embodiment, the transmission mechanism 140 is disposed between the motor 120 and the impact mechanism 150, and is used to achieve power transmission between the drive shaft 121 and the main shaft 151. In the present embodiment, the transmission mechanism 140 uses a planetary gear reduction. Because the working principle of the planetary gear reduction and the reduction generated by such a transmission mechanism have been fully disclosed to professionals in the field, a detailed description is omitted here for the purpose of brevity of the specification.

[0050] like Figure 1 As shown, the impact wrench 100 further includes a switch 160 , which is a trigger switch. The trigger switch is disposed on the grip portion 113 for the user to operate and control the switch of the impact wrench 100 .

[0051] In some embodiments, Figure 4 and Figure 5 As shown, the diameter of the anvil body 1531 is a first dimension D1. In the radial direction of the anvil 153, the sum of the lengths of the anvil body 1531 and the second end tooth 1532 is a third dimension D3. In some embodiments, the output shaft 131 includes a barrel 1311 and a square shaft 1312, and the diameter of the barrel 1311 is a second dimension D2. The second diameter dimension D2 of the barrel 1311 is determined based on the size of the square shaft 1312, and the second diameter dimension D2 of the barrel 1311 is a standard value.

[0052] In some embodiments, the ratio of the second dimension D2 to the first dimension D1 is greater than or equal to 1, that is, the first dimension D1 is less than or equal to the second dimension D2. When the second dimension D2 is a standard value, the smaller the first dimension D1 is, the greater the ratio of the second dimension D2 to the first dimension D1 is, so that when the diameter of the barrel 1311 remains unchanged, the size of the part where the anvil 153 and the impact block 152 match can be smaller, and the size of the anvil body 1531 can be smaller. In addition, when the size of the impact block 152 is smaller, the anvil body 1531 can match.

[0053] Optionally, the ratio of the second dimension D2 to the first dimension D1 may be 1. Optionally, the ratio of the second dimension D2 to the first dimension D1 may be 1.17. Optionally, the ratio of the second dimension D2 to the first dimension D1 may be 1.5. Optionally, the ratio of the second dimension D2 to the first dimension D1 may be 2. Optionally, the ratio of the second dimension D2 to the first dimension D1 may be 2.3. Optionally, the ratio of the second dimension D2 to the first dimension D1 may be 3.5. Optionally, when the second dimension D2 is 35 mm, the first dimension D1 may be 30 mm.

[0054] In some embodiments, the ratio of the third dimension D3 to the second dimension D2 is less than or equal to 3. When the second dimension D2 is a standard value, the smaller the third dimension D3 is, the smaller the ratio of the third dimension D3 to the second dimension D2 is, so that when the diameter of the barrel 1311 remains unchanged, the sum of the lengths of the anvil body 1531 and the second end teeth 1532 is smaller, so that the overall size of the anvil 153 is smaller.

[0055] Optionally, the ratio of the third dimension D3 to the second dimension D2 may be 3. Optionally, the ratio of the third dimension D3 to the second dimension D2 may be 2.8. Optionally, the ratio of the third dimension D3 to the second dimension D2 may be 2.5. Optionally, the ratio of the third dimension D3 to the second dimension D2 may be 2. Optionally, the ratio of the third dimension D3 to the second dimension D2 may be 1.54. Optionally, when the second dimension D2 is 35 mm, the third dimension D3 may be 54 mm.

[0056] By setting the ratio of the second dimension D2 to the first dimension D1 to be greater than or equal to 1, and the ratio of the third dimension D3 to the second dimension D2 to be less than or equal to 3, when the second dimension D2 remains unchanged, the first dimension D1 and the third dimension D3 are both smaller, so that the size of the anvil 153 is smaller and can be matched with the impact block 152 of a corresponding smaller size, so that the overall size of the impact wrench 100 is smaller.

[0057] When the impact wrench 100 is in working state, the anvil body 1531 and the second end teeth 1532 will always be impacted by the impact block 152, and the second end teeth 1532 are radially protruding from the output shaft 131, and there is no structure at the front end of the second end teeth 1532. Therefore, when the third dimension D3 of the hammer anvil 153 is small, the second end teeth 1532 are subjected to a large impact force and are likely to break. In addition, the width W of the second end teeth 1532 is smaller than the diameter D1 of the anvil body 1531, so that there is a size change at the connection between the anvil body 1531 and the second end teeth 1532, resulting in a raised sharp corner at the connection between the two. When the impact wrench 100 is in working state, there is stress concentration at the sharp corner, which is also likely to break.

[0058] In order to ensure that the service life of the impact wrench 100 is also guaranteed when the size of the impact wrench 100 is small, a reinforcement member 300 is provided in the impact wrench 100. Figures 3 to 5As shown, the impact wrench 100 further includes a reinforcement member 300, which is disposed between the output shaft 131 and the anvil 153, and is specifically disposed at the front end of the anvil 153 and the rear end of the output shaft 131. Thus, the reinforcement member 300 is present at the front end of the second end tooth 1532, and when the second end tooth 1532 is subjected to an impact force, the impact force is transmitted to the reinforcement member 300 and dispersed on the reinforcement member 300, and the connection between the anvil body 1531 and the second end tooth 1532 is free from sharp corners, and the transition between the two is natural, thereby enhancing the strength of the anvil 153 and enhancing the service life of the impact wrench 100.

[0059] like Figure 6 As shown, the reinforcement member 300 includes a portion connected to the anvil body 1531 and the second end tooth 1532, and extends outwardly along the radial direction of the anvil 153. Optionally, the length L1 of the portion of the reinforcement member 300 connected to the second end tooth 1532 extending outwardly may be less than the length L2 of the portion of the reinforcement member 300 connected to the anvil body 1531 extending outwardly. Optionally, the length L1 of the portion of the reinforcement member 300 connected to the second end tooth 1532 extending outwardly may be equal to the length L2 of the portion of the reinforcement member 300 connected to the anvil body 1531 extending outwardly. Optionally, the length L1 of the portion of the reinforcement member 300 connected to the second end tooth 1532 extending outwardly may be greater than the length L2 of the portion of the reinforcement member 300 connected to the anvil body 1531 extending outwardly. Among them, L1 specifically refers to the length of the part of the reinforcement member 300 connected to the second end tooth 1532 extending outward on one side, and L2 specifically refers to the length of the part of the reinforcement member 300 connected to the anvil body 1531 extending outward on one side.

[0060] like Figure 6 As shown, in the radial direction of the anvil 153, the length of the portion of the reinforcement member 300 including the anvil body 1531 is a fourth dimension D4. Optionally, the fourth dimension D4 may be greater than or equal to the second dimension D2. Optionally, the fourth dimension D4 may be less than or equal to the third dimension D3. Optionally, the fourth dimension D4 may be greater than or equal to the second dimension D2 and less than or equal to the third dimension D3. When the fourth dimension D4 is equal to the third dimension D3, the reinforcement member 300 may be Figure 6 The disc shape shown.

[0061] In some embodiments, the fourth dimension D4 of the length of the portion of the reinforcement member 300 including the anvil body 1531 is greater than or equal to the second dimension D2. Optionally, when the second dimension D2 is 35 mm, the fourth dimension D4 of the length of the portion of the reinforcement member 300 including the anvil body 1531 may be 35 mm. Optionally, when the second dimension D2 is 35 mm, the fourth dimension D4 of the length of the portion of the reinforcement member 300 including the anvil body 1531 may be 45 mm. Optionally, when the second dimension D2 is 35 mm, the fourth dimension D4 of the length of the portion of the reinforcement member 300 including the anvil body 1531 may be 53 mm.

[0062] In some embodiments, the reinforcement member 300 may also be any shape extending radially outward from the anvil 153, which is not limited in the present application. Optionally, since the width W of the second end tooth 1532 is smaller than the diameter D1 of the anvil body 1531, the length fourth dimension D4 of the portion of the reinforcement member 300 including the anvil body 1531 may be greater than the length of the portion of the reinforcement member 300 including the second end tooth 1532. Optionally, the length fourth dimension D4 of the portion of the reinforcement member 300 including the anvil body 1531 may be equal to the length of the portion of the reinforcement member 300 including the second end tooth 1532. Optionally, the length fourth dimension D4 of the portion of the reinforcement member 300 including the anvil body 1531 may be smaller than the length of the portion of the reinforcement member 300 including the second end tooth 1532.

[0063] like Figure 5 As shown, in the axial direction of the impact wrench 100, the thickness T of the reinforcement member 300 is less than or equal to 8 mm, so that the thickness of the reinforcement member 300 is guaranteed to a certain extent, and the situation that the thickness of the reinforcement member 300 is too large, resulting in a longer length in the front-to-back direction of the impact wrench 100, is avoided. Optionally, the thickness T of the reinforcement member 300 can be 1 mm. Optionally, the thickness T of the reinforcement member 300 can be 2.5 mm. Optionally, the thickness T of the reinforcement member 300 can be 4.7 mm. Optionally, the thickness T of the reinforcement member 300 can be 6.5 mm. Optionally, the thickness T of the reinforcement member 300 can be 7 mm.

[0064] In some embodiments, Figure 6 As shown, the interior of the anvil 153 includes a mounting hole 1533, which extends along the axial direction of the impact wrench 100 and is used to accommodate the spindle 151. In the axial direction of the impact wrench 100, the mounting hole 1533 extends beyond the reinforcement member 300, that is, the mounting hole 1533 extends from the interior of the anvil 153 to the interior of the output shaft 131. Optionally, as Figure 2 As shown, after the main shaft 151 is installed in the mounting hole 1533, it does not contact the end surface A of the mounting hole 1533.

[0065] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. An impact tool comprising: A housing configured with a receiving space; a motor including a drive shaft that rotates about a first axis; Output shaft, used for outputting torque externally; An impact mechanism applies an impact force to the output shaft, the impact mechanism comprising an impact block driven by the motor and an anvil matched with the impact block and impacted by the impact block; It is characterized in that The impact tool further comprises a reinforcement member, which is arranged between the output shaft and the hammer anvil; the hammer anvil comprises a cylindrical anvil body and a pair of end teeth symmetrically arranged radially along the anvil body, and the diameter of the anvil body is a first size; The output shaft comprises a barrel portion, the barrel portion has a diameter of a second size; Wherein, the ratio of the second size to the first size is greater than or equal to 1.

2. The impact tool according to claim 1, characterized in that In the radial direction of the hammer anvil, the sum of the lengths of the anvil body and the pair of end teeth is a third dimension, and a ratio of the third dimension to the second dimension is less than or equal to 3.

3. The impact tool according to claim 1, wherein: The reinforcing member includes a portion connected to the anvil body and the end teeth of the anvil, and extends outwardly in a radial direction of the anvil.

4. The impact tool according to claim 1, wherein: In the axial direction of the impact tool, the thickness of the reinforcement is less than or equal to 8 mm.

5. The impact tool according to claim 1, wherein: The anvil includes an axially extending mounting hole in its interior, and the mounting hole extends beyond the reinforcement member in the axial direction of the impact tool.

6. The impact tool according to claim 1, wherein: In the radial direction of the hammer anvil, the reinforcement comprises a portion of the anvil body having a fourth dimension, and the fourth dimension is greater than or equal to the second dimension.

7. The impact tool according to claim 2, wherein: In the radial direction of the hammer anvil, the reinforcement comprises a portion of the anvil body having a fourth dimension, and the fourth dimension is less than or equal to the third dimension.

8. The impact tool according to claim 1, wherein: The hammer anvil is integrally formed.

9. An impact tool comprising: A housing configured with a receiving space; a motor including a drive shaft that rotates about a first axis; Output shaft, used for outputting torque externally; An impact mechanism applies an impact force to the output shaft, the impact mechanism comprising an impact block driven by the motor and an anvil matched with the impact block and impacted by the impact block; It is characterized in that The hammer anvil comprises a cylindrical anvil body, the diameter of the anvil body being a first size; The output shaft comprises a barrel portion, the barrel portion has a diameter of a second size; A ratio of the second dimension to the first dimension is greater than 1.

1.

10. The impact tool according to claim 9, wherein: The hammer anvil comprises a pair of end teeth, which are symmetrically arranged on the anvil body in the radial direction of the hammer anvil, and together with the anvil body constitute the hammer anvil.

11. The impact tool according to claim 10, wherein: In the radial direction of the hammer anvil, the sum of the lengths of the anvil body and the pair of end teeth is a third dimension, and a ratio of the third dimension to the second dimension is less than or equal to 3.

12. The impact tool according to claim 9, wherein: The impact tool further includes a reinforcement member disposed between the output shaft and the anvil.

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