CN116141275A - Impact wrench - Google Patents

Abstract

The invention discloses an impact wrench, and belongs to the technical field of electric tools. The impact wrench comprises an output shaft, a sleeve and a locking structure, wherein the output shaft extends along a first axis a and is configured to rotate around the first axis a, the output shaft comprises a square shaft, the sleeve is detachably sleeved on the square shaft, a step part is arranged at the free end of the square shaft, the step part comprises an annular step surface, a columnar surface and an end surface which are sequentially connected, the locking structure comprises an elastic deformation body, the elastic deformation body is coaxially and fixedly sleeved on the columnar surface, and at least part of the elastic deformation body is larger than the maximum diagonal line of any cross section on the output shaft in a winding diameter mode, so that the elastic deformation body can elastically abut against the inner wall surface of the sleeve when the sleeve is configured to be sleeved on the square shaft. The elastic deformation body of the impact wrench is high in coaxiality with the output shaft, the disassembly and assembly difficulty of the sleeve and the output shaft is small, the reliability of the locking structure is high, the durability is good, and the structural strength of the output shaft is high.

Description

Impact wrench

Technical Field

The invention relates to the technical field of electric tools, in particular to an impact wrench.

Background

Impact wrenches are a relatively common type of power tool that can be used for disassembly, assembly, and drilling. The impact wrench generally comprises an output shaft capable of rotating at a high speed, when the impact wrench is used for disassembling a scaffold or a bolt on an automobile, the output shaft needs to be matched with a sleeve for use, and the sleeve needs to be locked on the output shaft.

The locking structure for realizing the locking of the sleeve on the output shaft is mostly a C-shaped clamping ring structure or a bayonet lock structure. However, the C-shaped collar structure has the defects of easy falling off and failure, easy clamping during deformation, high difficulty in dismounting the sleeve, failure of deformation function during long-time use and the like. The bayonet lock structure then needs to punch at the tetragonal axis part of output shaft when the installation, not only leads to transmitting torque's cross-section structure to be destroyed on the output shaft, and the structural strength of output shaft reduces, and easily has early strength not enough and fracture inefficacy problem, and has restricted impact wrench's maximum output torque.

Therefore, how to provide an impact wrench capable of overcoming the above-mentioned drawbacks is a technical problem to be solved.

Disclosure of Invention

The invention aims to provide an impact wrench which is high in reliability, good in durability, long in service life and easy to assemble and disassemble.

To achieve the purpose, the invention adopts the following technical scheme:

an impact wrench, comprising: an output shaft extending along a first axis a and configured to be rotatable about the first axis a, the output shaft including a square shaft; the sleeve is detachably sleeved on the square shaft, a step part is arranged at the free end of the square shaft, and the step part comprises an annular step surface, a columnar surface and an end surface which are sequentially connected; the impact wrench further comprises a locking structure, the locking structure comprises an elastic deformation body, the elastic deformation body is coaxially locked and sleeved on the cylindrical surface, the winding diameter of at least part of the elastic deformation body is larger than the maximum diagonal line of any cross section of the output shaft perpendicular to the first axis a, so that the elastic deformation body can elastically press against the inner wall surface of the sleeve when the sleeve is configured to be sleeved on the square shaft.

Preferably, one end of the elastic deformation body is abutted against the annular step surface; the impact wrench further comprises a gear structure, wherein the gear structure is detachably connected to the step part and is provided with a limiting and blocking surface for stopping the other end of the elastic deformation body.

Preferably, the end face is provided with a mounting hole along the first axis a; the gear structure comprises a limiting plate and a connecting column which are coaxially connected, the size of the limiting plate is larger than that of the end face, and one end, away from the limiting plate, of the connecting column can be inserted into the mounting hole.

Preferably, the end face is provided with a threaded hole along the first axis a; the gear structure comprises a fixing ring and a fixing piece, the size of the fixing ring is larger than that of the end face, a countersink is formed in the fixing ring, a cap body of the fixing piece is arranged in the countersink, and a screw of the fixing piece penetrates through the countersink to be connected with the threaded hole in a threaded mode.

Preferably, the end face is provided with a threaded hole along the first axis a; the gear structure comprises a limiting plate and a stud which are coaxially connected, the size of the limiting plate is larger than that of the end face, and the stud is in threaded connection with the threaded hole.

Preferably, the end face is convexly provided with a mounting column along the first axis a, and the end part of the mounting column far away from the end face is provided with an annular clamping groove; the gear structure comprises a fixed ring and a first clamping ring, wherein the fixed ring is sleeved on the mounting column, the outer diameter of the fixed ring is larger than the size of the end face, the annular clamping groove and the end face are positioned on two sides of the fixed ring, the first clamping ring is clamped in the annular clamping groove, and the outer diameter of the first clamping ring is larger than the inner diameter of the fixed ring.

Preferably, the columnar surface is provided with an annular limiting groove, and the annular limiting groove and the annular step surface are positioned at two sides of the elastic deformation body; the gear structure comprises a second clamping ring which is clamped in the annular limiting groove, and the second clamping ring is abutted against the elastic deformation body.

Preferably, the locking structure further comprises an elastic ring sleeved on the columnar surface, and the elastic deformation body is sleeved on the outer wall surface of the elastic ring.

Preferably, the elastic deformation body comprises a locking spring, the locking spring comprises an inner ring and a spiral outer ring connected with the inner ring, the inner ring is sleeved and hooped on the outer wall surface of the elastic ring, and the outermost ring of the spiral outer ring protrudes out of the outer wall surface of the output shaft and can be stopped against the inner wall surface of the sleeve.

Preferably, the elastic deformation body comprises a C-shaped elastic ring, the C-shaped elastic ring is sleeved and fastened on the outer wall surface of the elastic ring, and the outer wall surface of the C-shaped elastic ring protrudes out of the outer wall surface of the output shaft and can elastically abut against the inner wall surface of the sleeve.

Preferably, a limiting structure is arranged between the fixing ring and the end face.

An impact wrench, comprising: an output shaft extending along a first axis a and configured to be rotatable about the first axis a, the output shaft including a square shaft; the sleeve is detachably sleeved on the square shaft, a step part is arranged at the free end of the square shaft, and the step part comprises an annular step surface, a columnar surface and an end surface which are sequentially connected; the impact wrench also comprises a locking structure, wherein the locking structure comprises an elastic deformation body, and the elastic deformation body is coaxially and fixedly sleeved on the columnar surface; the impact wrench further comprises a gear structure, wherein the gear structure is detachably connected to the step part and is provided with a limiting and blocking surface for stopping the other end of the elastic deformation body.

The invention has the beneficial effects that:

the invention provides an impact wrench which comprises an output shaft, a sleeve and a locking structure, wherein the output shaft is arranged along a first axis a in an extending mode and is configured to rotate around the first axis a, the output shaft comprises a square shaft, the sleeve is detachably sleeved on the square shaft, a step part is arranged at the free end of the square shaft, the step part comprises an annular step surface, a cylindrical surface and an end surface which are sequentially connected, the locking structure comprises an elastic deformation body, the elastic deformation body is coaxially locked and sleeved on the cylindrical surface, and the winding diameter of at least part of the elastic deformation body is larger than the maximum diagonal line of any cross section of the output shaft, which is perpendicular to the first axis a, so that the elastic deformation body can elastically press against the inner wall surface of the sleeve when the sleeve is sleeved on the square shaft. According to the impact wrench, at least part of the rotation diameter of the elastic deformation body is larger than the maximum diagonal line of any cross section of the output shaft perpendicular to the first axis a, so that part of the structure of the elastic deformation body is contacted with the sleeve, the contact force is smaller when the elastic deformation body is subjected to equal deformation, and the locking structure is not easy to fail in the long-time use process, and is high in reliability and good in durability.

Drawings

FIG. 1 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a first gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 2 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a second gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 3 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a second gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 4 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a third gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 5 is a schematic view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a first gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 6 is a schematic view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a second gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 7 is a schematic view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a second gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 8 is a schematic view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a third gear structure of an impact wrench according to an embodiment of the present invention;

FIG. 9 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a fourth gear structure of an impact wrench according to a second embodiment of the present invention;

FIG. 10 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a fourth gear structure of an impact wrench according to a second embodiment of the present invention;

FIG. 11 is a schematic view of an output shaft, a sleeve, an elastic ring, a locking spring and a fifth gear structure of an impact wrench according to a second embodiment of the present invention;

fig. 12 is a schematic structural view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a fourth gear structure of an impact wrench according to a second embodiment of the present invention;

fig. 13 is a schematic structural view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a fourth gear structure of an impact wrench according to a second embodiment of the present invention;

fig. 14 is a schematic structural view of an output shaft, a sleeve, an elastic ring, a C-shaped elastic ring and a fifth gear structure of an impact wrench according to a second embodiment of the present invention.

In the figure:

100. an output shaft; 110. a step portion; 111. an annular step surface; 112. a columnar surface; 113. an end face; 114. a mounting hole; 115. a limit groove; 116. a threaded hole; 117. a mounting column; 118. an annular clamping groove; 119. an annular limit groove;

120. a cylindrical shaft; 130. a square shaft;

200. a locking structure; 210. an elastic ring; 220. a locking spring; 230. c-shaped elastic rings;

300. a gear structure; 310. a limiting plate; 320. a connecting column; 330. a stud; 340. a fixing ring; 341. a limiting block; 350. a fixing member; 360. a first snap ring; 370. and a second snap ring.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Embodiment one:

the present embodiment provides an impact wrench that may be used for disassembly, assembly, and drilling. The impact wrench includes a housing, a motor, a battery, a transmission mechanism, and an output shaft 100. Specifically, the motor, the battery and the transmission mechanism are all located in the shell, the battery is used for supplying power to the motor, a motor shaft of the motor is in transmission connection with an input end of the transmission mechanism, an output end of the transmission mechanism is in transmission connection with the output shaft 100, and at least part of the output shaft 100 is located outside the shell and extends along the first axis a. The output shaft 100 is rotatable about a first axis a under the drive of the motor and transmission. The housing, motor, battery and transmission are all prior art and will not be described in detail herein.

More specifically, the output shaft 100 includes a cylindrical shaft 120 and a tetragonal shaft 130 that are connected to each other, where the tetragonal shaft 130 is disposed at a free end of the output shaft 100 far away from the transmission mechanism, and as the name implies, the tetragonal shaft 130 is a columnar structure with four planes disposed on an outer wall surface, any two adjacent planes of the four planes are all disposed vertically, and any two opposite planes of the four planes are all disposed in parallel. The impact wrench further includes a socket detachably coupled to the square shaft 130, and the impact wrench can be made to perform different functions by replacing different sockets.

In this embodiment, in order to realize stable connection between the square shaft 130 and the sleeve, so as to ensure that the square shaft 130 has enough locking force on the sleeve, and in order to ensure that the sleeve and the square shaft 130 still have connection reliability after being assembled and disassembled for multiple times, the assembly and disassembly are still easy, as shown in fig. 1 to 8, a step portion 110 is provided on a free end of the square shaft 130, the step portion 110 includes an annular step surface 111, a columnar surface 112 and an end surface 113 which are sequentially connected, the annular step surface 111 is a horizontal plane, the columnar surface 112 is perpendicular to the annular step surface 111, an annular groove with an L-shaped vertical section is formed between the annular step surface 111, the end surface 113 is parallel to the annular step surface 111, and the end surface 113 is an end plane of the output shaft 100, which is far away from an end of the transmission mechanism. The impact wrench further comprises a locking structure 200, wherein the locking structure 200 comprises an elastic deformation body, the elastic deformation body is coaxially and fixedly sleeved on the cylindrical surface 112, and the at least partial winding diameter of the elastic deformation body is larger than the maximum diagonal line of any cross section of the output shaft 100 perpendicular to the first axis a, so that the elastic deformation body can elastically press against the inner wall surface of the sleeve when the sleeve is sleeved on the square shaft 130.

Since the elastic deformation body is made of elastic materials, the elastic deformation body can deform under the action of external force, particularly the external diameter of the elastic deformation body can be obviously changed when the elastic deformation body is twisted, so that the elastic deformation body can be properly compressed under the action of mutual extrusion of the inner wall surface of the sleeve and the outer wall surface of the square shaft 130 by rotating the sleeve when the sleeve is mounted on the square shaft 130, and the sleeve can be relatively easily mounted on the square shaft 130; after being assembled in place, the elastic deformation body has a tendency to return to its original state, which causes the elastic deformation body to elastically press against the inner wall surface of the sleeve, thereby enabling the sleeve to be stably assembled on the square shaft 130; when the sleeve needs to be disassembled, the elastic deformation body can be stressed by rotating the sleeve so as to properly reduce the size of the elastic deformation body again, thereby enabling the sleeve to be easily separated from the square shaft 130.

The impact wrench makes a part of the elastic deformation body contact with the sleeve by making the rotation diameter of at least a part of the elastic deformation body larger than the maximum diagonal line of any cross section of the output shaft 100 perpendicular to the first axis a, so that the contact force is smaller when the elastic deformation body is equally deformed, and the locking structure 200 is not easy to fail in the long-time use process, and has high reliability and good durability.

In order to ensure the coaxiality of the elastic deformation body and the square shaft 130, as shown in fig. 1 to 8, the impact wrench further comprises an elastic ring 210. The elastic ring 210 is a circular ring structure, and is made of an elastic material, and can be deformed appropriately under the action of an external force, the diameter of the inner ring of the elastic ring 210 is slightly smaller than the diameter of the cylindrical surface 112, and the diameter of the outer ring of the elastic ring 210 is smaller than the dimension of the longest diagonal line on the tetragonal axis 130. The elastic ring 210 is sleeved on the columnar surface 112, and the elastic deformation body is sleeved on the outer wall surface of the elastic ring 210.

Because the diameter of the inner ring of the elastic ring 210 is slightly smaller than the diameter of the cylindrical surface 112, the elastic ring 210 can be ensured to be sleeved on the cylindrical surface 112 and be tightly hooped on the cylindrical surface 112 under the action of external force, so that the elastic ring 210 can be ensured to be stably sleeved on the step part 110, good coaxiality of the elastic ring 210 and the square shaft 130 is ensured, and good coaxiality of an elastic deformation body sleeved on the elastic ring 210 and the square shaft 130 is ensured.

Alternatively, in the present embodiment, as shown in fig. 1 to 4, the elastic deformation body includes a lock spring 220, the lock spring 220 includes an inner ring and a spiral outer ring connected to the inner ring, the inner ring is sleeved and tightened on an outer wall surface of the elastic ring 210, and an outermost ring of the spiral outer ring protrudes from the outer wall surface of the output shaft 100 and is disposed so as to be able to be stopped against an inner wall surface of the sleeve. Further alternatively, in the present embodiment, only one spiral outer ring is included, and the spiral outer ring and the inner ring are not located in the same level, the inner ring being disposed near the end face 113, and the outer ring being disposed near the annular step face 111.

During the process of installing or detaching the sleeve, the middle spiral portion of the locking spring 220 is radially compressed, and the start and stop portions are respectively expanded toward the outer circumferential side, and the maximum diameter of the spring is reduced, so that the sleeve can be easily assembled and disassembled. The elastic deformation body is arranged into two circles of wound special-shaped springs, so that the diameter of each circle of springs is smaller, the elastic coefficient is small, the contact force between the special-shaped springs and the sleeve is smaller in the same deformation process, the pressure on the structural surface is smaller, and the failure is not easy to occur; meanwhile, according to a spring torsion calculation formula and fatigue life calculation, the special-shaped spring with the reduced elasticity coefficient K value is more reliable in durability.

When the elastic deformation body is the locking spring 220, in order to realize the axial limit of the locking spring 220, the locking spring 220 is prevented from being separated from the free end of the step portion 110, one end of the elastic deformation body is stopped on the annular step surface 111, and the impact wrench further comprises a gear structure 300, wherein the gear structure 300 is detachably connected to the step portion 110, is specifically connected to the end surface 113, and is provided with a limit stop surface for stopping the other end of the elastic deformation body.

Optionally, as shown in fig. 1, the gear structure 300 includes a limiting plate 310 and a connecting post 320 that are coaxially connected, where the size of the limiting plate 310 is greater than that of the end surface 113, the end surface 113 is provided with a mounting hole 114 along a first axis a, and one end of the connecting post 320, far from the limiting plate 310, can be inserted into the mounting hole 114. The stable connection of the connection post 320 and the mounting hole 114 may be achieved using an interference fit. Since the size of the limiting plate 310 is larger than that of the end surface 113, the lower bottom surface of the limiting plate 310 can limit the elastic ring 210 and the locking spring 220 from being separated from the output shaft 100 from the free end of the square shaft 130, thereby stably connecting the elastic ring 210 and the locking spring 220 to the cylindrical surface 112 of the stepped portion 110 of the square shaft 130.

Of course, in addition to the above structure, the gear structure 300 may also include a fixing ring 340 and a fixing member 350 as shown in fig. 2 and 3, where the size of the fixing ring 340 is larger than that of the end face 113, a counter bore is provided on the fixing ring 340, a cap body of the fixing member 350 is disposed in the counter bore, a threaded hole 116 is provided on the end face 113 along the first axis a, and a screw of the fixing member 350 passes through the counter bore and is screwed in the threaded hole 116. The gear structure 300 can achieve stable connection of the fixing member 350 and the square shaft 130 by using a screw connection, thereby stably connecting the fixing ring 340 to the square shaft 130. And since the size of the fixing ring 340 is larger than that of the end face 113, the lower bottom surface of the fixing ring 340 can restrict the elastic ring 210 and the locking spring 220 from being separated from the output shaft 100 from the free end of the square shaft 130, thereby stably connecting the elastic ring 210 and the locking spring 220 to the cylindrical surface 112 of the stepped portion 110 of the square shaft 130. In addition, the countersunk holes on the fixing ring 340 can shadow the nuts of the fixing piece 350, so as to achieve the purposes of improving the aesthetic property and avoiding the nuts from being scratched by the sleeve.

Optionally, to avoid rotation of the fixing ring 340, a limiting structure is provided between the fixing ring 340 and the end surface 113. Specifically, the limiting structure is a limiting block 341 and a limiting groove 115, one of the limiting block 341 and the limiting groove 115 is disposed on an annular surface of the fixed ring 340 close to the end surface 113, the other is disposed on the end surface 113, and the limiting block 341 and the limiting groove 115 are clamped, so that limiting of the fixed ring 340 is achieved, and the fixed ring 340 cannot rotate around the first axis a.

Of course, in addition to the above structure, as shown in fig. 4, the gear structure 300 may also include a limiting plate 310 and a stud 330 coaxially connected, where the size of the limiting plate 310 is larger than that of the end face 113, the end face 113 is provided with a threaded hole 116 along the first axis a, and the stud 330 is screwed into the threaded hole 116. The gear structure 300 can realize stable connection of the stud 330 and the square shaft 130 by adopting threaded connection, thereby stably connecting the limiting plate 310 to the square shaft 130. Since the size of the limiting plate 310 is larger than that of the end surface 113, the lower bottom surface of the limiting plate 310 can limit the elastic ring 210 and the locking spring 220 from being separated from the output shaft 100 from the free end of the square shaft 130, thereby stably connecting the elastic ring 210 and the locking spring 220 to the cylindrical surface 112 of the stepped portion 110 of the square shaft 130.

Of course, in this embodiment, as shown in fig. 5 to 8, the elastic deformation body may be a C-shaped elastic ring 230, and the C-shaped elastic ring 230 is sleeved and fastened on the outer wall surface of the elastic ring 210, and the outer wall surface of the C-shaped elastic ring 230 protrudes from the outer wall surface of the output shaft 100 and can elastically abut against the inner wall surface of the sleeve.

When the elastic deformation body is the C-shaped elastic ring 230, in order to realize the axial limit of the C-shaped elastic ring 230, the C-shaped elastic ring 230 is prevented from being separated from the free end of the step portion 110, one end of the elastic deformation body is stopped against the annular step surface 111, and the impact wrench further comprises a gear structure 300, wherein the gear structure 300 is detachably connected to the end surface 113 and is provided with a limit stop surface for stopping the other end of the elastic deformation body.

Optionally, as shown in fig. 5, the gear structure 300 includes a limiting plate 310 and a connecting post 320 that are coaxially connected, where the size of the limiting plate 310 is greater than that of the end surface 113, the end surface 113 is provided with a mounting hole 114 along the first axis a, and one end of the connecting post 320, far from the limiting plate 310, can be inserted into the mounting hole 114. The stable connection of the connection post 320 and the mounting hole 114 may be achieved using an interference fit. Since the size of the limiting plate 310 is larger than that of the end face 113, the lower bottom surface of the limiting plate 310 can limit the elastic ring 210 and the C-shaped elastic ring 230 from being separated from the output shaft 100 from the free end of the square shaft 130, so that the elastic ring 210 and the C-shaped elastic ring 230 are stably connected to the cylindrical surface 112 of the stepped portion 110 of the square shaft 130.

Of course, in addition to the above structure, the gear structure 300 may also include a fixing ring 340 and a fixing member 350 as shown in fig. 6 and 7, where the size of the fixing ring 340 is larger than that of the end face 113, a countersink is provided on the fixing ring 340, a cap body of the fixing member 350 is disposed in the countersink, a threaded hole 116 is provided on the end face 113 along the first axis a, and a screw of the fixing member 350 passes through the countersink and is screwed in the threaded hole 116. The gear structure 300 can achieve stable connection of the fixing member 350 and the square shaft 130 by using a screw connection, thereby stably connecting the fixing ring 340 to the square shaft 130. Since the size of the fixing ring 340 is larger than that of the end face 113, the lower bottom surface of the fixing ring 340 can restrict the elastic ring 210 and the C-shaped elastic ring 230 from being separated from the output shaft 100 from the free end of the square shaft 130, thereby stably connecting the elastic ring 210 and the C-shaped elastic ring 230 to the cylindrical surface 112 of the stepped portion 110 of the square shaft 130. In addition, the countersunk holes on the fixing ring 340 can shadow the nuts of the fixing piece 350, thereby improving the aesthetic property and avoiding the nuts from scratching the sleeve. A limiting structure can be disposed between the fixing ring 340 and the end surface 113, and the limiting structure is the same as the above limiting structure, and will not be described herein.

Of course, in addition to the above structure, as shown in fig. 8, the gear structure 300 may also include a limiting plate 310 and a stud 330 coaxially connected, where the size of the limiting plate 310 is larger than that of the end face 113, the end face 113 is provided with a threaded hole 116 along the first axis a, and the stud 330 is screwed into the threaded hole 116. The gear structure 300 can realize stable connection of the stud 330 and the square shaft 130 by adopting threaded connection, thereby stably connecting the limiting plate 310 to the square shaft 130. And since the size of the limiting plate 310 is larger than that of the end face 113, the lower bottom surface of the limiting plate 310 can limit the elastic ring 210 and the C-shaped elastic ring 230 from being separated from the output shaft 100 from the free end of the square shaft 130, so that the elastic ring 210 and the C-shaped elastic ring 230 are stably connected to the cylindrical surface 112 of the stepped portion 110 of the square shaft 130.

Embodiment two:

the present embodiment provides an impact wrench that may be used for disassembly, assembly, and drilling. The impact wrench includes a housing, a motor, a battery, a transmission mechanism, and an output shaft 100. Specifically, the motor, the battery and the transmission mechanism are all located in the shell, the battery is used for supplying power to the motor, a motor shaft of the motor is in transmission connection with an input end of the transmission mechanism, an output end of the transmission mechanism is in transmission connection with the output shaft 100, and at least part of the output shaft 100 is located outside the shell and extends along the first axis a. The output shaft 100 is rotatable about a first axis a under the drive of the motor and transmission. More specifically, the output shaft 100 includes a cylindrical shaft 120 and a tetragonal shaft 130 that are connected to each other, where the tetragonal shaft 130 is disposed at a free end of the output shaft 100 far away from the transmission mechanism, and as the name implies, the tetragonal shaft 130 is a columnar structure with four planes disposed on an outer wall surface, two adjacent planes of the four planes are vertically disposed, and any opposite planes of the four planes are parallel to each other, so as to form a tetragonal shape. The impact wrench further includes a socket detachably coupled to the square shaft 130, and the impact wrench can be made to perform different functions by replacing different sockets.

In this embodiment, in order to realize stable connection between the square shaft 130 and the sleeve, it is ensured that the square shaft 130 has enough locking force on the sleeve, the sleeve and the square shaft 130 still have connection reliability after being assembled and disassembled for multiple times, and the assembly and disassembly are still easy, as shown in fig. 9 to 14, a step portion 110 is provided on the free end of the square shaft 130, the step portion 110 includes an annular step surface 111, a columnar surface 112 and an end surface 113 which are sequentially connected, the annular step surface 111 is a horizontal plane, the columnar surface 112 is perpendicular to the annular step surface 111, an annular groove with an L-shaped vertical section is formed between the annular step surface 111, the end surface 113 is parallel to the annular step surface 111, and the end surface 113 is an end plane of the output shaft 100, which is far away from the end of the transmission mechanism. The impact wrench further comprises a locking structure 200, the locking structure 200 comprising an elastic deformation body coaxially locked and sleeved on the cylindrical surface 112, wherein at least part of the elastic deformation body has a winding diameter larger than the maximum diagonal of any cross section of the output shaft 100 perpendicular to the first axis a, so that the elastic deformation body can elastically press against the inner wall surface of the sleeve when the sleeve is configured to be sleeved on the square shaft 130.

Since the elastic deformation body is made of elastic material, the elastic deformation body can deform under the action of external force, so that when the sleeve is mounted on the square shaft 130, the elastic deformation body can be properly compressed under the action of mutual extrusion of the inner wall surface of the sleeve and the outer wall surface of the square shaft 130 by rotating the sleeve, and the sleeve can be mounted on the square shaft 130 relatively easily; after being assembled in place, the elastic deformation body has a tendency to return to the original state, and the elastic deformation body is elastically pressed against the inner wall surface of the sleeve, so that the sleeve can be stably assembled on the square shaft 130; when the sleeve needs to be disassembled, the elastic deformation body can be stressed by rotating the sleeve so as to properly reduce the size of the elastic deformation body again, thereby enabling the sleeve to be easily separated from the square shaft 130. In addition, the impact wrench makes the partial structure of the elastic deformation body contact with the sleeve by making the rotation diameter of at least part of the elastic deformation body larger than the maximum diagonal line of any cross section of the output shaft 100 perpendicular to the first axis a, so that the contact force is smaller when the elastic deformation body is equally deformed, and the locking structure 200 is not easy to fail in the long-time use process, and has high reliability and good durability.

In order to ensure the coaxiality of the elastic deformation body and the square shaft 130, as shown in fig. 9 to 14, the impact wrench further comprises an elastic ring 210. The elastic ring 210 is a circular ring structure, and is made of an elastic material, and can be deformed appropriately under the action of an external force, the diameter of the inner ring of the elastic ring 210 is slightly smaller than the diameter of the cylindrical surface 112, and the diameter of the outer ring of the elastic ring 210 is smaller than the dimension of the longest diagonal line on the tetragonal axis 130. The elastic ring 210 is sleeved on the columnar surface 112, and the elastic deformation body is sleeved on the outer wall surface of the elastic ring 210.

Because the diameter of the inner ring of the elastic ring 210 is slightly smaller than the diameter of the cylindrical surface 112, the elastic ring 210 can be ensured to be sleeved on the cylindrical surface 112 under the action of external force and can be hooped on the cylindrical surface 112, so that the elastic ring 210 can be ensured to be stably sleeved on the step part 110, good coaxiality of the elastic ring 210 and the square shaft 130 is ensured, and good coaxiality of an elastic deformation body sleeved on the elastic ring 210 and the square shaft 130 is ensured.

Alternatively, in the present embodiment, as shown in fig. 9 to 11, the elastic deformation body includes a lock spring 220, the lock spring 220 includes an inner ring and a spiral outer ring connected to the inner ring, the inner ring is fitted around and tightened on the outer wall surface of the elastic ring 210, and the outermost ring of the spiral outer ring protrudes from the outer wall surface of the output shaft 100 and is disposed so as to be able to be stopped against the inner wall surface of the sleeve. Further alternatively, the outer ring and the inner ring are not located in the same level, the inner ring is disposed adjacent to the end face 113, and the outer ring is disposed adjacent to the annular step face 111.

During the process of installing or detaching the sleeve, the middle spiral portion of the locking spring 220 is radially compressed, and the start and stop portions are respectively expanded toward the outer circumferential side, and the maximum diameter of the spring is reduced, so that the sleeve can be easily assembled and disassembled. The elastic deformation body is arranged into two circles of wound special-shaped springs, so that the diameter of each circle of springs is smaller, the elastic coefficient is small, the contact force between the special-shaped springs and the sleeve is smaller in the same deformation process, the pressure on the structural surface is smaller, and the failure is not easy to occur; meanwhile, according to a spring torsion calculation formula and fatigue life calculation, the special-shaped spring with the reduced elasticity coefficient K value is more reliable in durability.

When the elastic deformation body is the locking spring 220, in order to realize the axial limit of the locking spring 220, the locking spring 220 is prevented from being separated from the free end of the step portion 110, one end of the elastic deformation body is stopped on the annular step surface 111, and the impact wrench further comprises a gear structure 300, wherein the gear structure 300 is detachably connected to the end surface 113 and is provided with a limit stop surface for stopping the other end of the elastic deformation body.

Alternatively, as shown in fig. 9 and 10, the gear structure 300 includes a securing ring 340 and a first snap ring 360. The end face 113 is provided with a mounting post 117 along a first axis a in a protruding mode, the end portion, far away from the end face 113, of the mounting post 117 is provided with an annular clamping groove 118, a fixing ring 340 is sleeved on the mounting post 117, the outer diameter of the fixing ring 340 is larger than the size of the end face 113, the annular clamping groove 118 and the end face 113 are located on two sides of the fixing ring 340, a first clamping ring 360 is clamped in the annular clamping groove 118, and the outer diameter of the first clamping ring 360 is larger than the inner diameter of the fixing ring 340. In the gear structure 300, the first snap ring 360 is clamped in the annular clamping groove 118, and the positions of the locking spring 220 and the elastic ring 210 are limited by the first snap ring 360, so that the elastic ring 210 and the locking spring 220 are prevented from being separated from the output shaft 100 from the free end of the square shaft 130, and the elastic ring 210 and the locking spring 220 are stably connected to the columnar surface 112 of the step part 110 of the square shaft 130.

Optionally, to avoid rotation of the fixing ring 340, a limiting structure is provided between the fixing ring 340 and the end surface 113. Specifically, the limiting structure is a limiting block 341 and a limiting groove 115, one of the limiting block 341 and the limiting groove 115 is disposed on an annular surface of the fixed ring 340 close to the end surface 113, the other is disposed on the end surface 113, and the limiting block 341 and the limiting groove 115 are clamped, so that limiting of the fixed ring 340 is achieved, and the fixed ring 340 cannot rotate around the first axis a.

Of course, in addition to the above structure, as shown in fig. 11, the gear structure 300 may also include a second snap ring 370, an annular limiting groove 119 is disposed on the cylindrical surface 112, the annular limiting groove 119 and the annular step surface 111 are located on two sides of the elastic deformation body, the second snap ring 370 is clamped in the annular limiting groove 119, and the second snap ring 370 is stopped against the elastic deformation body. The gear structure 300 has a simple structure, and the annular limiting groove 119 is formed in the columnar surface 112, the second clamping ring 370 is clamped in the annular limiting groove 119, the positions of the locking spring 220 and the elastic ring 210 are limited by the second clamping ring 370, and the elastic ring 210 and the locking spring 220 are prevented from being separated from the output shaft 100 from the free end of the square shaft 130, so that the elastic ring 210 and the locking spring 220 are stably connected to the columnar surface 112 of the stepped part 110 of the square shaft 130.

Of course, in this embodiment, as shown in fig. 12 to 14, the elastic deformation body may be a C-shaped elastic ring 230, and the C-shaped elastic ring 230 is sleeved and fastened on the outer wall surface of the elastic ring 210, and the outer wall surface of the C-shaped elastic ring 230 protrudes from the outer wall surface of the output shaft 100 and can elastically abut against the inner wall surface of the sleeve.

When the elastic deformation body is the C-shaped elastic ring 230, in order to realize the axial limit of the C-shaped elastic ring 230, the C-shaped elastic ring 230 is prevented from being separated from the free end of the step portion 110, one end of the elastic deformation body is stopped against the annular step surface 111, and the impact wrench further comprises a gear structure 300, wherein the gear structure 300 is detachably connected to the end surface 113 and is provided with a limit stop surface for stopping the other end of the elastic deformation body.

Alternatively, as shown in fig. 12 and 13, the gear structure 300 includes a securing ring 340 and a first snap ring 360. The end face 113 is provided with a mounting post 117 along a first axis a in a protruding mode, the end portion, far away from the end face 113, of the mounting post 117 is provided with an annular clamping groove 118, a fixing ring 340 is sleeved on the mounting post 117, the outer diameter of the fixing ring 340 is larger than the size of the end face 113, the annular clamping groove 118 and the end face 113 are located on two sides of the fixing ring 340, a first clamping ring 360 is clamped in the annular clamping groove 118, and the outer diameter of the first clamping ring 360 is larger than the inner diameter of the fixing ring 340. In the gear structure 300, the first snap ring 360 is clamped in the annular clamping groove 118, and the positions of the locking spring 220 and the elastic ring 210 are limited by the first snap ring 360, so that the elastic ring 210 and the locking spring 220 are prevented from being separated from the output shaft 100 from the free end of the square shaft 130, and the elastic ring 210 and the locking spring 220 are stably connected to the columnar surface 112 of the step part 110 of the square shaft 130. A limiting structure can be disposed between the fixing ring 340 and the end surface 113, and the limiting structure is the same as the above limiting structure, and will not be described herein.

Of course, in addition to the above structure, as shown in fig. 14, the gear structure 300 may also include a second snap ring 370, an annular limiting groove 119 is disposed on the cylindrical surface 112, the annular limiting groove 119 and the annular step surface 111 are located on two sides of the elastic deformation body, the second snap ring 370 is clamped in the annular limiting groove 119, and the second snap ring 370 is stopped against the elastic deformation body. The gear structure 300 has a simple structure, and the annular limiting groove 119 is formed in the columnar surface 112, the second clamping ring 370 is clamped in the annular limiting groove 119, the positions of the locking spring 220 and the elastic ring 210 are limited by the second clamping ring 370, and the elastic ring 210 and the locking spring 220 are prevented from being separated from the output shaft 100 from the free end of the square shaft 130, so that the elastic ring 210 and the locking spring 220 are stably connected to the columnar surface 112 of the stepped part 110 of the square shaft 130.

Compared with the gear structure 300 in the first embodiment, the gear structure 300 provided in the present embodiment does not need to open holes on the square shaft 130, so as to avoid the damage to the section of the output shaft 100 for transmitting torque, protect the structural strength of the output shaft 100 to the greatest extent, and solve the problem of fracture failure caused by low early strength of the output shaft 100.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (12)

1. An impact wrench, comprising:

an output shaft extending along a first axis a and configured to be rotatable about the first axis a, the output shaft including a square shaft;

the sleeve is detachably sleeved on the square shaft and is characterized in that,

the free end of the square shaft is provided with a step part, and the step part comprises an annular step surface, a columnar surface and an end surface which are sequentially connected;

the impact wrench further comprises a locking structure, the locking structure comprises an elastic deformation body, the elastic deformation body is coaxially locked and sleeved on the cylindrical surface, the winding diameter of at least part of the elastic deformation body is larger than the maximum diagonal line of any cross section of the output shaft perpendicular to the first axis a, so that the elastic deformation body can elastically press against the inner wall surface of the sleeve when the sleeve is configured to be sleeved on the square shaft.

2. The impact wrench of claim 1, wherein the impact wrench comprises,

one end of the elastic deformation body is stopped against the annular step surface;

the impact wrench further comprises a gear structure, wherein the gear structure is detachably connected to the step part and is provided with a limiting and blocking surface for stopping the other end of the elastic deformation body.

3. The impact wrench of claim 2, wherein the impact wrench is further characterized in that,

the end face is provided with a mounting hole along the first axis a;

the gear structure comprises a limiting plate and a connecting column which are coaxially connected, the size of the limiting plate is larger than that of the end face, and one end, away from the limiting plate, of the connecting column can be inserted into the mounting hole.

4. The impact wrench of claim 2, wherein the impact wrench is further characterized in that,

the end face is provided with a threaded hole along the first axis a;

the gear structure comprises a fixing ring and a fixing piece, the size of the fixing ring is larger than that of the end face, a countersink is formed in the fixing ring, a cap body of the fixing piece is arranged in the countersink, and a screw of the fixing piece penetrates through the countersink to be connected with the threaded hole in a threaded mode.

5. The impact wrench of claim 2, wherein the impact wrench is further characterized in that,

the end face is provided with a threaded hole along the first axis a;

the gear structure comprises a limiting plate and a stud which are coaxially connected, the size of the limiting plate is larger than that of the end face, and the stud is in threaded connection with the threaded hole.

6. The impact wrench of claim 2, wherein the impact wrench is further characterized in that,

a mounting column is arranged on the end face in a protruding mode along the first axis a, and an annular clamping groove is formed in the end portion, far away from the end face, of the mounting column;

the gear structure comprises a fixed ring and a first clamping ring, wherein the fixed ring is sleeved on the mounting column, the outer diameter of the fixed ring is larger than the size of the end face, the annular clamping groove and the end face are positioned on two sides of the fixed ring, the first clamping ring is clamped in the annular clamping groove, and the outer diameter of the first clamping ring is larger than the inner diameter of the fixed ring.

7. The impact wrench of claim 2, wherein the impact wrench is further characterized in that,

the columnar surface is provided with an annular limiting groove, and the annular limiting groove and the annular step surface are positioned on two sides of the elastic deformation body;

the gear structure comprises a second clamping ring which is clamped in the annular limiting groove, and the second clamping ring is abutted against the elastic deformation body.

8. The impact wrench according to any one of claims 1-7, wherein,

the locking structure further comprises an elastic ring, the elastic ring is sleeved on the columnar surface, and the elastic deformation body is sleeved on the outer wall surface of the elastic ring.

9. The impact wrench of claim 8, wherein the impact wrench is further configured to,

the elastic deformation body comprises a locking spring, the locking spring comprises an inner ring and a spiral outer ring connected with the inner ring, the inner ring is sleeved and hooped on the outer wall surface of the elastic ring, and the outermost ring of the spiral outer ring protrudes out of the outer wall surface of the output shaft and can be stopped against the inner wall surface of the sleeve.

10. The impact wrench of claim 8, wherein the impact wrench is further configured to,

the elastic deformation body comprises a C-shaped elastic ring, the C-shaped elastic ring is sleeved and hooped on the outer wall surface of the elastic ring, and the outer wall surface of the C-shaped elastic ring protrudes out of the outer wall surface of the output shaft and can be elastically abutted with the inner wall surface of the sleeve.

11. The impact wrench as claimed in claim 4 or 6, wherein,

and a limiting structure is arranged between the fixing ring and the end face.

12. An impact wrench, comprising:

an output shaft extending along a first axis a and configured to be rotatable about the first axis a, the output shaft including a square shaft;

the sleeve is detachably sleeved on the square shaft and is characterized in that,

the free end of the square shaft is provided with a step part, and the step part comprises an annular step surface, a columnar surface and an end surface which are sequentially connected;

the impact wrench also comprises a locking structure, wherein the locking structure comprises an elastic deformation body, and the elastic deformation body is coaxially and fixedly sleeved on the columnar surface;

the impact wrench further comprises a gear structure, wherein the gear structure is detachably connected to the step part and is provided with a limiting and blocking surface for stopping the other end of the elastic deformation body.

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