Power tools and bushings

Abstract

An electric tool comprises a housing, a motor housed in the housing, an output shaft driven to rotate by the motor, and a transmission mechanism connecting the motor and the output shaft. One end of the output shaft extends out of the housing, and the transmission mechanism transmits the driving force of the motor to the output shaft. The electric tool comprises a sleeve supporting the output shaft, and the sleeve is fixed in the housing. The sleeve comprises an annular column and a concave-convex retaining portion located on the outer peripheral wall of the annular column, and the concave-convex retaining portion is clamped on the inner wall of the housing. The sleeve is clamped on the inner wall of the housing by the concave-convex retaining portion to prevent the sleeve from loosening; at the same time, the concave-convex retaining portion is clamped on the inner wall of the housing to be embedded in the housing, which can effectively limit the rotation of the sleeve in the housing, thereby avoiding wear caused by relative rotation between the sleeve and the housing, and playing an anti-loosening role.

Description

[Technical field]

[0001] The present invention relates to an electric tool and a shaft sleeve, and in particular to an electric tool and a shaft sleeve with a shaft sleeve anti-loosening structure. [Background Technology]

[0002] An electric wrench is an electric tool used to tighten and loosen bolts and nuts. It is a tool for tightening high-strength bolts. Typically, an electric wrench includes an output shaft extending from the casing, which is used to connect to and provide torque to the working parts. A sleeve is provided between the output shaft and the casing, and the casing and sleeve are secured together by a press-fit interference fit. However, excessive interference fit can damage parts such as the sleeve during press-fit. A smaller interference fit, however, can make it difficult to ensure the proper fit of the casing's shaft hole due to thermal expansion and radial loads. This can easily cause the sleeve to loosen and axially shift during operation, reducing the lifespan of the electric wrench. Therefore, maintaining the secure connection between the casing and sleeve and extending the lifespan of the electric wrench has become a pressing issue.

[0003] In view of this, it is indeed necessary to provide an improved power tool and sleeve to overcome the defects of the prior art. [Summary of the invention]

[0004] In view of the deficiencies in the prior art, the present invention aims to provide an electric tool and a shaft sleeve with a shaft sleeve anti-loosening structure, which can effectively improve the problem of the shaft sleeve in the electric tool being easily loosened.

[0005] The present invention solves the problems of the prior art by employing a technical solution: a power tool comprising a housing, a motor housed within the housing, an output shaft driven for rotation by the motor, and a transmission mechanism connecting the motor and the output shaft. One end of the output shaft extends outside the housing, and the transmission mechanism transmits the driving force of the motor to the output shaft. The power tool includes a sleeve supporting the output shaft, which is retained within the housing. The sleeve comprises an annular column and a concave-convex retaining portion located on the outer peripheral wall of the annular column, which is retained by the inner wall of the housing.

[0006] A further improvement is as follows: the sleeve includes a groove located on the outer peripheral wall of the annular cylinder, the groove divides the annular cylinder into a front section and a rear section, the concave and convex retaining portion is arranged on any section of the front section or the rear section of the annular cylinder, the concave and convex retaining portion is a knurled design, that is, it is a plurality of conical protrusions evenly arranged along the circumference and depressions located between the protrusions, and the protrusions are embedded in the inner wall of the casing.

[0007] A further improvement is that the concave-convex retaining portion is further provided with an inclined guiding portion at an end portion, and the inclined guiding portion is used to guide the protruding portion to be embedded in the inner wall of the casing.

[0008] A further improvement is that the housing is provided with a groove recessed from the inner wall and corresponding to the recessed portion, and the power tool includes a retaining ring for engaging the sleeve and the housing, a portion of the retaining ring is accommodated in the recessed portion of the sleeve and the other portion is accommodated in the groove of the housing.

[0009] A further improvement is that the sleeve includes a step portion protruding outward from the rear end of the annular column, the outer diameter of the step portion is larger than the outer diameter of the concave and convex retaining portion, and the step portion abuts against the inner end wall of the casing.

[0010] A further improvement is that the sleeve also includes an annular protrusion extending from the front end of the annular cylinder out of the housing, the outer diameter of the annular protrusion is smaller than the outer diameter of the annular cylinder, and the power tool includes a locking pressure ring located at the front end of the housing and fixed with the annular protrusion.

[0011] A further improved solution is: the outer diameter of the locking pressure ring is larger than the outer diameter of the annular column, and the locking pressure ring is fixed on the annular protrusion and abuts against the front end of the housing.

[0012] A further improvement is as follows: the housing includes a main housing for accommodating the motor and a head housing for accommodating the output shaft, the head housing is located at the front end of the main housing, the sleeve is fixed on the inner wall of the head housing and the concave and convex retaining parts of the sleeve are embedded in the head housing.

[0013] The technical solution adopted by the present invention to solve the existing technical problems is: a sleeve for being accommodated in the housing of an electric tool, the sleeve comprising an annular column and a concave-convex retaining portion located on the outer peripheral wall of the annular column, the concave-convex retaining portion being clamped on the inner wall of the housing.

[0014] A further improvement is as follows: the sleeve includes a recessed portion located on the outer peripheral wall of the annular cylinder, the recessed portion divides the annular cylinder into a front section and a rear section, the concave-convex retaining portion is arranged on any section of the front section or the rear section of the annular cylinder, the concave-convex retaining portion is a knurled design, that is, it is a plurality of conical protrusions evenly arranged along the circumference and a recess located between the protrusions, and the protrusions are embedded in the inner wall of the casing.

[0015] Compared with the prior art, the present invention has the following advantages: the shaft sleeve includes an annular column and a concave-convex retaining portion located on the outer peripheral wall of the annular column, the concave-convex retaining portion being clamped to the inner wall of the housing. The shaft sleeve is clamped to the inner wall of the housing by the concave-convex retaining portion to prevent the shaft sleeve from loosening. At the same time, the concave-convex retaining portion is clamped to the inner wall of the housing to fit into the housing, effectively limiting the rotation of the shaft sleeve within the housing, thereby preventing wear caused by relative rotation between the shaft sleeve and the housing and preventing loosening. [Brief Description of the Drawings]

[0016] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0017] Figure 1 is a perspective schematic diagram of a power tool according to a first embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional view of the power tool shown;

[0019] Figure 3 yes Figure 1 A perspective schematic diagram of the head structure of the power tool shown;

[0020] Figure 4 yes Figure 3 A cross-sectional view of the head structure shown;

[0021] Figure 5 yes Figure 3 A three-dimensional schematic diagram of the shaft sleeve in the head structure shown;

[0022] Figure 6 is a perspective schematic diagram of a shaft sleeve according to a second embodiment of the present invention;

[0023] Figure 7 is a perspective schematic diagram of a shaft sleeve according to a third embodiment of the present invention;

[0024] Figure 8 yes Figure 7 A three-dimensional schematic diagram of the sleeve from another angle

[0025] Figure 9 is a perspective schematic diagram of a shaft sleeve according to a fourth embodiment of the present invention;

[0026] Figure 10 is a side view of a head structure according to a fifth embodiment of the present invention;

[0027] Figure 11 yes Figure 10 An exploded schematic diagram of the head structure is shown.

[0028] The meaning of the reference numerals in the figures:

[0029] 100. Power tool 1. Housing 10. Groove 11. Main housing 12. Head housing 2. Motor 3. Output shaft 4. Transmission mechanism 41. Impact mechanism 42. Planetary gear train 5. Bushing 51. Annular cylinder 52. Concave-convex retaining portion 53. Raised portion 54. Inclined guide portion 55. Retaining ring groove 56. Step portion 57. Annular protrusion 58. Oil reservoir 6. Retaining ring 7. Locking ring 15. Bushing 151. Annular cylinder 152. Concave-convex retaining portion 154. Inclined guide portion 25. Bushing 251. Annular cylinder 252. Concave-convex retaining portion 35. Bushing 351. Annular cylinder 352. Concave-convex retaining portion 354. Inclined guide portion 45. Bushing 451. Annular cylinder 452. Concave-convex retaining portion [Specific implementation method]

[0030] like Figures 1 to 5 The figure shows a power tool 100 according to a first embodiment of the present invention, which is an electric wrench. The power tool 100 includes a housing 1, a motor 2 housed within the housing 1, an output shaft 3 driven by the motor 1, and a transmission mechanism 4 connecting the motor 2 and the output shaft 3. One end of the output shaft 3 extends outside the housing 1, and the transmission mechanism 4 transmits the driving force of the motor 2 to the output shaft 3. The power tool 100 also includes a sleeve 5 that supports the output shaft 3 and is retained within the housing 1.

[0031] The housing 1 includes a main housing 11 for accommodating the motor 2 and a head housing 12 for accommodating the output shaft 3. The head housing 12 is located at the front end of the main housing 11. Figure 3 and Figure 4 As shown, the transmission mechanism 4 is housed within the housing 12 and includes an impact mechanism 41 and a planetary gear mechanism 42 connected to the impact mechanism 41. The impact mechanism 41 is housed within the housing 12 and connected to the rear end of the output shaft 3, while the motor 2 is connected to the rear end of the planetary gear mechanism 42. The motor 2 transmits driving force to the impact mechanism 41 via the planetary gear mechanism 42, and the impact mechanism 41 drives the output shaft 3 to rotate, thereby realizing the overall function of the power tool 100.

[0032] The sleeve 5 is fixed on the inner wall of the head shell 12, and when the power tool 100 is in operation, the sleeve 5 plays a role in supporting the output shaft 3 to withstand a large radial load. Figure 5 As shown, the sleeve 5 includes an annular column 51 and a concave-convex retaining portion 52 located on the outer circumferential wall of the annular column 51. The concave-convex retaining portion 52 is clamped on the inner wall of the head shell 12 of the housing 1. The concave-convex retaining portion 52 is a knurled design, that is, it has a plurality of conical protrusions 53 evenly arranged along the circumference and recesses located between the protrusions 53. The protrusions 53 are embedded in the inner wall of the head shell 12.

[0033] The outer diameter of the concave-convex retaining portion 52 is larger than that of the annular column 51. It is tapered and embedded within the head shell 12 of the housing 1, effectively limiting the rotation of the sleeve 5. This prevents wear between the sleeve 5 and the head shell 12 due to relative rotation, thus preventing loosening. In this embodiment, the concave-convex retaining portion 52 also has an inclined guide portion 54 at the front end. This guide portion 54 is used to guide the protrusion 53 into embedding on the inner wall of the head shell 12. This guide portion 54 provides an inclined guide for the protrusion 53, thereby facilitating the press-fit of the sleeve 5.

[0034] The sleeve 5 also includes a groove 55 located on the outer circumferential wall of the annular column 51. The groove 55 divides the annular column 51 into a front section and a rear section. The concave-convex retaining portion 52 is provided on the rear section of the annular column 51. The head shell 12 of the housing 1 is provided with a groove 10 recessed from the inner wall and corresponding to the recess 55. The power tool 100 includes a retaining ring 6 that engages the sleeve 5 and the housing 1. A portion of the retaining ring 6 is received within the recess 55 of the sleeve 5, while the other portion is received in the groove 10 of the housing 1. The retaining ring 6 is used to limit the axial movement of the sleeve 5 to prevent the sleeve 5 from falling off and affecting the normal operation of the power tool 100.

[0035] The concave-convex retaining portion 52 of the present invention is a knurled design, with a conical protrusion 53 embedded in the head 12 of the housing 1. This effectively limits the rotation of the sleeve 5 within the housing 1, thereby preventing wear caused by relative rotation between the sleeve 5 and the housing 1. This effectively alleviates the problem of the sleeve 5 easily loosening in the power tool 100. Furthermore, the outer diameter of the annular column 51 is smaller than that of the concave-convex retaining portion 52, meaning that the annular column 51 serves as a guide for the press-fit of the concave-convex retaining portion 52.

[0036] In this embodiment, the concave-convex retaining portion 52 is disposed on the rear section of the annular column 51. However, in other embodiments, the concave-convex retaining portion 52 may be disposed on either the front or rear section of the annular column 51, depending on specific needs. Similarly, in this embodiment, the power tool 100 is provided with a retaining ring 6 for engaging the shaft sleeve 5 with the housing 1. However, in other embodiments, if a corresponding structure is provided to limit the axial movement of the shaft sleeve 5, the retaining ring 6 may not be provided. In this case, the head shell 12 of the housing 1 does not need to be provided with a groove 10 for receiving the retaining ring 6.

[0037] like Figure 6The figure shows a sleeve 15 according to a second embodiment of the present invention. The sleeve 15 includes an annular column 151 and a concave-convex retaining portion 152 located on the outer peripheral wall of the annular column 151. The concave-convex retaining portion 152 is retained on the inner wall of the head shell 12. In this embodiment, the concave-convex retaining portion 152 is provided on the front section of the annular column 151. In this case, the sleeve 15 is assembled into the head shell 12 from front to back. The concave-convex retaining portion 152 is provided with an inclined guide portion 154 at the rear end. The inclined guide portion 154 is used to guide the sleeve 15 from front to back to be embedded in the inner wall of the head shell 12, thereby facilitating the press-fit of the sleeve 15.

[0038] like Figures 7 and 8 The figure shows a sleeve 25 according to a third embodiment of the present invention. The sleeve 25 includes an annular column 251 and a concave-convex retaining portion 252 located on the outer circumferential wall of the annular column 251. The concave-convex retaining portion 252 is disposed on the rear end of the annular column 251. The sleeve 25 includes a stepped portion 56 extending outward from the rear end of the annular column 251. The outer diameter of the stepped portion 56 is larger than that of the concave-convex retaining portion 252, and the stepped portion 56 abuts against the inner end wall of the head shell 12 of the housing 1. The stepped portion 56 is used to limit the axial movement of the sleeve 25 to prevent the sleeve 25 from falling off and affecting the normal operation of the power tool 100. In this case, the power tool 100 does not need to be provided with the retaining ring 6.

[0039] The sleeve 25 also includes an oil reservoir 58 located on the inner circumferential wall of the annular cylinder 251. This reservoir 58 is located at the rear end of the inner circumferential wall of the annular cylinder 251 and extends axially. When the sleeve 25 is supported on the output shaft 3, the oil reservoir 58 serves as both an oil storage and return channel. Located at the rear end of the inner circumferential wall of the annular cylinder 251, the reservoir 58 collects and returns lubricating oil, preventing it from leaking out. Furthermore, the axial extension of the reservoir 58 provides greater lubrication contact with the output shaft 3, ensuring optimal lubrication.

[0040] like Figure 9 The fourth embodiment of the present invention is shown as a shaft sleeve 35. The shaft sleeve 35 comprises an annular column 351, a concave-convex retaining portion 352 located on the outer circumferential wall of the annular column 351, and a stepped portion 56 extending outward from the rear end of the annular column 351. The concave-convex retaining portion 352 is retained by the inner wall of the head shell 12. In this embodiment, the concave-convex retaining portion 352 is provided on the front and rear sections of the annular column 351 and is tapered into the head shell 12 of the housing 1. This effectively limits the rotation of the shaft sleeve 5, thereby preventing wear caused by relative rotation between the shaft sleeve 5 and the head shell 12 and preventing loosening.

[0041] like Figure 10 and Figure 11The figure shows a sleeve 45 according to the fifth embodiment of the present invention. The sleeve 45 includes an annular column 451, a concave-convex retaining portion 452 located on the outer peripheral wall of the annular column 451, and a step portion 56 protruding outward from the rear end of the annular column 451. The concave-convex retaining portion 352 is provided on the rear section of the annular column 351. The sleeve 45 also includes an annular protrusion 57 extending from the front end of the annular column 451 to the head shell 12 of the housing 1. The outer diameter of the annular protrusion 57 is smaller than the outer diameter of the annular column 451. The power tool 100 also includes a locking pressure ring 7 located at the front end of the head shell 12 and fixedly engaged with the annular protrusion 57. The outer diameter of the locking pressure ring 7 is larger than the outer diameter of the annular column 51 so as to be retained on the annular protrusion 57 and abut against the front end of the head shell 12. The locking ring 7 is used to further limit the axial movement of the sleeve 45, thereby preventing the sleeve 45 from falling off and avoiding further damage to the entire machine.

[0042] The present invention is not limited to the specific embodiments described above. Those skilled in the art will readily appreciate that numerous alternatives to the shaft sleeve for a power tool of the present invention exist without departing from the principles and scope of the present invention. The scope of protection of the present invention shall be determined by the claims.

Claims

1. A power tool comprising a housing, a motor housed within the housing, an output shaft driven for rotation by the motor, and a transmission mechanism connecting the motor and the output shaft, wherein one end of the output shaft extends outside the housing, the transmission mechanism transmits the driving force of the motor to the output shaft, and the power tool includes a sleeve supporting the output shaft, the sleeve being retained within the housing; characterized in that: The sleeve includes an annular cylinder and a concave-convex holding portion located on the outer peripheral wall of the annular cylinder, the annular cylinder is configured to guide the concave-convex holding portion to embed into the inner wall of the casing; the concave-convex holding portion is a knurled design, and the concave-convex holding portion is clamped on the inner wall of the casing, the concave-convex holding portion has a plurality of conical protrusions evenly arranged along the circumference, a recess located between the protrusions and an inclined guide portion connected to the protrusion, the inclined guide portion is configured to guide the protrusion to embed into the inner wall of the casing, the head shell of the casing is provided with a groove which is recessed from the inner wall and corresponds to the recessed portion, the power tool also includes a retaining ring for engaging the sleeve and the casing, a part of the retaining ring is accommodated in the recessed portion of the sleeve and the other part is accommodated in the groove of the casing.

2. The electric tool according to claim 1, wherein: The sleeve includes a groove located on the outer peripheral wall of the annular column, the groove divides the annular column into a front section and a rear section, and the concave-convex retaining portion is arranged on any one of the front section or the rear section of the annular column.

3. The electric tool according to claim 1, wherein: The shaft sleeve includes a step portion protruding outward from the rear end of the annular column, the outer diameter of the step portion is larger than the outer diameter of the concave-convex holding portion, and the step portion abuts against the inner end wall of the casing.

4. The electric tool according to claim 3, wherein: The sleeve also includes an annular protrusion extending from the front end of the annular column out of the housing, the outer diameter of the annular protrusion is smaller than the outer diameter of the annular column, and the power tool includes a locking pressure ring located at the front end of the housing and fixed with the annular protrusion.

5. The electric tool according to claim 4, wherein: The outer diameter of the locking pressure ring is greater than the outer diameter of the annular column. The locking pressure ring is fixed on the annular protrusion and abuts against the front end of the housing.

6. The electric tool according to claim 1, wherein: The housing includes a main housing for accommodating the motor and a head housing for accommodating the output shaft. The head housing is located at the front end of the main housing. The shaft sleeve is fixed on the inner wall of the head housing, and the concave and convex retaining parts of the shaft sleeve are embedded in the head housing.

7. A sleeve for receiving in a housing of a power tool, characterized in that: The cam is configured to engage the inner wall of the housing and to engage the outer wall of the housing so as to engage with the inner wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing so as to engage with the outer wall of the housing 8. The sleeve according to claim 7, wherein: The sleeve includes a recessed portion located on the outer peripheral wall of the annular column, the recessed portion divides the annular column into a front section and a rear section, and the concave-convex retaining portion is arranged on either the front section or the rear section of the annular column.

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