CN210282180U

CN210282180U - Electric tool

Info

Publication number: CN210282180U
Application number: CN201920948311.9U
Authority: CN
Inventors: 黄海彬; 施宏敏
Original assignee: Jiangsu Dongcheng M&e Tools Co ltd
Current assignee: Jiangsu Dongcheng M&e Tools Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-10
Anticipated expiration: 2029-06-21

Abstract

An electric tool comprises a machine shell, a motor contained in the machine shell, an output shaft driven by the motor to rotate and a transmission mechanism connected with the motor and the output shaft, wherein the transmission mechanism transmits the driving force of the motor to the output shaft, the electric tool comprises a shaft sleeve supporting the output shaft, and the shaft sleeve is fixedly arranged in the machine shell. The shaft sleeve comprises an annular cylinder, a step part and an annular protruding part, the step part protrudes outwards from the rear end of the annular cylinder, the annular protruding part extends out of the front end of the annular cylinder and abuts against the inner end wall of the casing, and the electric tool comprises a locking pressing ring which is matched and fixed with the annular protruding part and abuts against the front end of the casing so as to limit the axial movement of the shaft sleeve and prevent the shaft sleeve from loosening; simultaneously, the locking clamping ring and the step portion are arranged in the front and back to clamp and fix the shaft sleeve in the casing, so that the rotation of the shaft sleeve in the casing can be effectively limited, the abrasion of the shaft sleeve and the casing caused by relative rotation is avoided, and the anti-loosening effect is achieved.

Description

Electric tool

[ technical field ]

The utility model relates to an electric tool, in particular to electric tool with axle sleeve locking structure that takes off.

[ background art ]

The electric wrench is an electric tool for screwing and unscrewing the bolt and the nut, and is a tool for screwing the high-strength bolt. Generally, an electric wrench includes an output shaft extending out of a housing for connecting a working member and providing a torque force to the working member; a shaft sleeve is arranged between the output shaft and the shell, and the shell and the shaft sleeve are fixed through press fitting and interference fit. However, an excessive interference causes damage to parts such as the sleeve during press-fitting; and less magnitude of interference then can be because of casing thermal expansion and radial load effect, be difficult to guarantee the cooperation quality in casing shaft hole, so cause electric spanner during operation that the axle sleeve pine takes off and phenomenon such as axial displacement appear easily to electric spanner's life has been reduced. Therefore, how to keep the fixation between the casing and the shaft sleeve and improve the service life of the electric wrench is a problem to be solved urgently.

Accordingly, there is a need for an improved power tool that overcomes the deficiencies of the prior art.

[ contents of utility model ]

The electric tool with the shaft sleeve anti-loosening structure can effectively improve the problem that the shaft sleeve is easy to loosen in the electric tool.

The utility model provides a technical scheme that prior art problem adopted is: an electric tool comprises a machine shell, a motor contained in the machine shell, an output shaft driven by the motor to rotate and a transmission mechanism for connecting the motor and the output shaft, wherein one end of the output shaft extends out of the machine shell, the transmission mechanism transmits the driving force of the motor to the output shaft, the electric tool comprises a shaft sleeve for supporting the output shaft, and the shaft sleeve is fixedly arranged in the machine shell. The axle sleeve includes cyclic annular cylinder, the step portion that stretches to the evagination from the rear end of cyclic annular cylinder and the cyclic annular protruding portion that extends the casing from the front end of cyclic annular cylinder, the step portion supports and leans on the interior endwall of casing, just electric tool includes and fixes and support the locking clamping ring who leans on in the front end of casing with the cooperation of cyclic annular protruding portion.

The further improvement scheme is as follows: the axle sleeve is equipped with the external screw thread that is located on cyclic annular protruding portion periphery wall, the locking clamping ring is equipped with the internal thread that is located locking clamping ring internal perisporium, the internal thread of locking clamping ring and the external screw thread of cyclic annular protruding portion make locking clamping ring and cyclic annular protruding portion be connected fixedly together with threaded connection's mode.

The further improvement scheme is as follows: the casing is provided with an accommodating part for accommodating the annular cylinder of the shaft sleeve, the outer diameter of the locking pressing ring is larger than the inner diameter of the accommodating part, and the locking pressing ring is fixedly arranged on the annular protruding part and abuts against the front end of the casing.

The further improvement scheme is as follows: the outer diameter of the step part is larger than the inner diameter of the accommodating part, and the step part abuts against the inner end wall at the rear end of the accommodating part.

The further improvement scheme is as follows: the axle sleeve is including being located the recess on the periphery wall of cyclic annular cylinder, the recess is separated for anterior segment and back end cyclic annular cylinder, the external diameter of cyclic annular cylinder back end is greater than the internal diameter of holding portion just is less than the external diameter of step portion, promptly the back end card of cyclic annular cylinder is held on the inner wall of casing.

The further improvement scheme is as follows: the axle sleeve is still including being located the oil storage tank on the internal perisporium of cyclic annular cylinder, the oil storage tank sets up in the rear end of the internal perisporium of cyclic annular cylinder and forms along axial extension.

The further improvement scheme is as follows: the casing is including the main casing body of acceping the motor and accommodate the head shell of output shaft, the head shell is located the front end of the main casing body, the axle sleeve is fixed on the inner wall of head shell just the locking clamping ring supports and leans on in the front end of head shell.

The further improvement scheme is as follows: the transmission mechanism is accommodated in the head shell and comprises an impact mechanism and a planetary gear train mechanism connected with the impact mechanism, the impact mechanism is connected with the rear end of the output shaft, the motor is connected with the rear end of the planetary gear train mechanism, the motor transmits the driving force to the impact mechanism through the planetary gear train mechanism, and the impact mechanism drives the output shaft to rotate.

Compared with the prior art, the utility model discloses following beneficial effect has: the stepped part abuts against the inner end wall of the shell and the locking pressing ring abuts against the front end of the shell so as to limit the axial movement of the shaft sleeve and prevent the shaft sleeve from loosening; simultaneously, the locking clamping ring and the step portion are arranged in the front and back to clamp and fix the shaft sleeve in the casing, so that the rotation of the shaft sleeve in the casing can be effectively limited, the abrasion of the shaft sleeve and the casing caused by relative rotation is avoided, and the anti-loosening effect is achieved.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a perspective view of an electric tool according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the power tool shown in FIG. 1;

FIG. 3 is a perspective view of the head structure of the power tool shown in FIG. 1;

FIG. 4 is an exploded schematic view of the head structure shown in FIG. 3;

FIG. 5 is a cross-sectional view of the head structure shown in FIG. 3;

FIG. 6 is a perspective view of the sleeve in the head configuration shown in FIG. 3;

fig. 7 is a perspective view of another angle of the bushing shown in fig. 6.

The meaning of the reference symbols in the figures:

100. electric tool 1, casing 10, accommodating part 11, main casing 12, head casing 2, motor 3, output shaft 4, transmission mechanism 41, impact mechanism 42, planetary gear train mechanism 5, shaft sleeve 51, annular column 52, step part 53, annular protruding part 54, concave-convex holding part 541, protruding part 542, inclined guiding part 55, groove 56, oil storage tank 6, locking press ring

[ detailed description of the invention ]

Referring to fig. 1 to 7, an electric tool 100 according to a preferred embodiment of the present invention is shown, wherein the electric tool 100 is an electric wrench. The electric tool 100 includes a housing 1, a motor 2 accommodated in the housing 1, an output shaft 3 driven by the motor 1 to rotate, and a transmission mechanism 4 connecting the motor 2 and the output shaft 3. One end of the output shaft 3 extends out of the shell 1, and the transmission mechanism 4 transmits the driving force of the motor 2 to the output shaft 3. The power tool 100 further comprises a sleeve 5 supporting the output shaft 3, the sleeve 5 being held in the housing 1.

The housing 1 includes a main housing 11 for accommodating the motor 2 and a head housing 12 for accommodating the output shaft 3, wherein the head housing 12 is located at the front end of the main housing 11. As shown in fig. 1 and 2, the transmission mechanism 4 is accommodated in the head housing 12 and includes an impact mechanism 41 and a planetary gear train mechanism 42 connected to the impact mechanism 41, the impact mechanism 41 is accommodated in the head housing 12 and connected to the rear end of the output shaft 3, and the motor 2 is connected to the rear end of the planetary gear train mechanism 42. The motor 2 transmits the driving force to the impact mechanism 41 through the planetary gear train mechanism 42, and the impact mechanism 41 drives the output shaft 3 to rotate, so that the whole function of the electric tool 100 is realized.

The shaft sleeve 5 is fixed on the inner wall of the head housing 12, and in the working process of the electric tool 100, the shaft sleeve 5 plays a role of supporting the output shaft 3 so as to bear large radial load. As shown in fig. 4 to 6, the shaft sleeve 5 includes a ring-shaped cylinder 51, a step 52 protruding outward from the rear end of the ring-shaped cylinder 51, and a ring-shaped protrusion 53 extending from the front end of the ring-shaped cylinder 51 to the head casing 12 of the housing 1, wherein the step 52 abuts against the inner end wall of the head casing 12 of the housing 1. The head shell 12 of the casing 1 is provided with an accommodating part 10 for accommodating the annular column 51 of the shaft sleeve 5, and the outer diameter of the step part 52 is larger than the inner diameter of the accommodating part 10, so that the step part 52 is abutted against the inner end wall at the rear end of the accommodating part 10. The step 52 is used to limit the axial forward movement of the shaft sleeve 5, so as to prevent the shaft sleeve 5 from falling off and affecting the normal operation of the power tool 100.

As shown in fig. 3 to 5, the outer diameter of the annular protrusion 53 is smaller than the outer diameter of the annular cylinder 51, and the electric power tool 100 includes a locking collar 6 which is fixed in cooperation with the annular protrusion 53 and abuts against the front end of the head housing 12 of the housing 1. The axle sleeve 5 is equipped with the external screw thread that is located on cyclic annular protrusion 53 periphery wall, and locking clamping ring 6 is equipped with the internal thread that is located locking clamping ring 6 internal perisporium, is with the internal thread of locking clamping ring 6 makes with the external screw thread of cyclic annular protrusion 53 with threaded connection's mode locking clamping ring 6 is connected fixedly together with cyclic annular protrusion 53. Meanwhile, since the outer diameter of the locking collar 6 is larger than the inner diameter of the accommodating portion 10, the locking collar 6 abuts against the front end of the head housing 12 while being held on the annular protrusion 53. The locking compression ring 6 is matched with the annular protruding part 53 to limit the axial backward movement of the shaft sleeve 5, so that the shaft sleeve 5 is prevented from falling off, and further damage to the whole machine is avoided.

Step portion 52 supports and leans on in the inner endwall of skull 12, just locking clamping ring 6 supports and leans on the front end of skull 12 in casing 1 to restriction axle sleeve 5 is at the ascending removal of axial and prevent the pine of axle sleeve 5 and take off. Meanwhile, the locking compression ring 6 and the step part 52 are arranged in the front and back to fasten the shaft sleeve 5 in the head shell 12 of the machine shell 1, so that the rotation of the shaft sleeve 5 in the head shell 12 can be effectively limited, the abrasion of the shaft sleeve 5 and the head shell 12 caused by relative rotation is avoided, and the anti-loosening effect is achieved.

The boss 5 includes a concave-convex holding portion 54 on the outer peripheral wall of the annular cylinder 51 and a groove 55 on the outer peripheral wall of the annular cylinder 51, the groove 55 partitioning the annular cylinder 51 into a front section and a rear section. The outer diameter of the rear section of the annular cylinder 51 is larger than the inner diameter of the accommodating part 10 and smaller than the outer diameter of the step part 52, that is, the rear section of the annular cylinder 51 is clamped on the inner wall of the casing 1. The rear section of the annular cylinder 51 of the present invention is clamped on the inner wall of the head shell 12 by the concave-convex fixing part 52; the concave-convex holding portion 52 is designed by knurling, i.e. it is a plurality of cone-shaped protrusions 541 uniformly arranged along the circumferential direction and depressions between the protrusions 541, and the protrusions 541 are embedded in the inner wall of the head housing 12. The outer diameter of the concave-convex holding part 54 is larger than that of the annular cylinder 51, and the concave-convex holding part is embedded into the head shell 12 of the casing 1 in a conical shape, so that the rotation of the shaft sleeve 5 can be further effectively limited, the abrasion of the shaft sleeve 5 and the head shell 12 caused by relative rotation is avoided, and the anti-loosening effect is achieved.

In the present embodiment, the concave-convex holding portion 54 is disposed on the rear section of the annular cylinder 51, but in other embodiments, the concave-convex holding portion 54 may be disposed on any one of the front section and the rear section of the annular cylinder 51 according to specific requirements. Meanwhile, the concave-convex holding portion 54 is further provided with an inclined guiding portion 542 located at the front end portion of the concave-convex holding portion 54, and the inclined guiding portion 542 is used for guiding the protruding portion 541 to be embedded into the inner wall of the head housing 12. The inclined guide portion 542 functions to guide the projection 541 obliquely, thereby facilitating press-fitting of the boss 5.

As shown in fig. 7, the shaft sleeve 5 further includes an oil reservoir 56 located on the inner peripheral wall of the annular cylinder 51, and the oil reservoir 56 is provided at the rear end of the inner peripheral wall of the annular cylinder 51 and extends in the axial direction. When the sleeve 5 is supported on the output shaft 3, the oil reservoir 56 functions to store oil, return oil, and the like. The oil storage tank 56 is positioned at the rear end of the inner peripheral wall of the annular cylinder 51 to collect and return lubricating oil and prevent the lubricating oil from leaking outwards; meanwhile, the oil reservoir 56 is formed to extend in the axial direction, so that the output shaft 3 has a greater lubricating contact to ensure a good lubricating effect.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that there are numerous alternatives to the bushing for a power tool of the present invention without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An electric tool (100) comprises a machine shell, a motor accommodated in the machine shell, an output shaft (3) driven by the motor to rotate and a transmission mechanism (4) connected with the motor and the output shaft (3), wherein one end of the output shaft (3) extends out of the outer side of the machine shell, the transmission mechanism (4) transmits the driving force of the motor to the output shaft (3), the electric tool (100) comprises a shaft sleeve (5) supporting the output shaft (3), and the shaft sleeve (5) is fixedly held in the machine shell; the method is characterized in that: the utility model discloses a locking clamping ring, including the casing, axle sleeve (5) include cyclic annular cylinder (51), extend cyclic annular protruding portion (53) of casing from the rear end of cyclic annular cylinder (51) outside protruding step portion (52) and from the front end of cyclic annular cylinder (51), step portion (52) support by in the interior endwall of casing, just electric tool (100) include with cyclic annular protruding portion (53) the cooperation fixed and support by in the locking clamping ring (6) of the front end of casing.

2. The power tool (100) of claim 1, wherein: axle sleeve (5) are equipped with the external screw thread that is located on cyclic annular protruding portion (53) periphery wall, locking clamping ring (6) are equipped with the internal thread that is located locking clamping ring (6) internal perisporium, the internal thread of locking clamping ring (6) and the external screw thread of cyclic annular protruding portion (53) make locking clamping ring (6) be connected fixedly together with cyclic annular protruding portion (53) with threaded connection's mode.

3. The power tool (100) of claim 1, wherein: the casing is equipped with the portion of holding (10) of the cyclic annular cylinder (51) of acceping axle sleeve (5), the external diameter of locking clamping ring (6) is greater than the internal diameter of portion of holding (10), locking clamping ring (6) is held and is leaned on cyclic annular protruding portion (53) and lean on the front end in the casing.

4. The power tool (100) of claim 3, wherein: the outer diameter of the step part (52) is larger than the inner diameter of the accommodating part (10), and the step part (52) is abutted against the inner end wall of the rear end of the accommodating part (10).

5. The power tool (100) of claim 3, wherein: the axle sleeve (5) is including recess (55) that are located on the periphery wall of cyclic annular cylinder (51), recess (55) are separated cyclic annular cylinder (51) for anterior segment and back end, the external diameter of cyclic annular cylinder (51) back end is greater than the internal diameter of holding portion (10) just is less than the external diameter of step portion (52), promptly the back end card of cyclic annular cylinder (51) is held on the inner wall of casing.

6. The power tool (100) of claim 1, wherein: the shaft sleeve (5) further comprises an oil storage groove (56) located on the inner peripheral wall of the annular cylinder body (51), and the oil storage groove (56) is formed in the rear end of the inner peripheral wall of the annular cylinder body (51) in an axially extending mode.

7. The power tool (100) of claim 1, wherein: the casing is including the main casing body (11) of acceping the motor and accommodate head shell (12) of output shaft (3), head shell (12) are located the front end of main casing body (11), axle sleeve (5) fix on the inner wall of head shell (12) and locking clamping ring (6) support and lean on the front end in head shell (12).

8. The power tool (100) of claim 7, wherein: the transmission mechanism (4) is accommodated in the head shell (12) and comprises an impact mechanism (41) and a planetary gear train mechanism (42) connected with the impact mechanism (41), the impact mechanism (41) is connected with the rear end of the output shaft (3), the motor is connected with the rear end of the planetary gear train mechanism (42), the motor transmits the driving force to the impact mechanism (41) through the planetary gear train mechanism (42), and the impact mechanism (41) drives the output shaft (3) to rotate.