CN218440531U

CN218440531U - Speed reducing mechanism of electric tool and electric tool

Info

Publication number: CN218440531U
Application number: CN202221688152.1U
Authority: CN
Inventors: 张建芳
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2023-02-03
Anticipated expiration: 2032-07-01

Abstract

The utility model discloses an electric tool's reduction gears, including gear box, pivot, bearing and elastic component. The gear box is provided with a shaft cavity, and the inner wall of the shaft cavity is provided with a bearing groove and a speed reduction groove. The rotating shaft is arranged in the shaft cavity and can rotate relative to the gear box. The bearing is arranged in the bearing groove, and the rotating shaft is in interference fit with the inner wall of the bearing. The elastic piece is arranged in the speed reducing groove and has friction force with the groove wall of the speed reducing groove, and the elastic piece is sleeved on the rotating shaft and is in friction contact with the rotating shaft. The utility model discloses an electric tool's reduction gears, the simple design is ingenious, can provide the damping force for the speed reduction of pivot and make its stall fast.

Description

Speed reducing mechanism of electric tool and electric tool

Technical Field

The utility model relates to an electric tool field especially relates to an electric tool's reduction gears.

Background

The rotating shaft of the electric tool is arranged in a shaft cavity of the gear box through a bearing, the rotating shaft runs at a high speed during working, the machine is suddenly stopped, and the abnormal starting of the shaft lock is easily caused by the action of the inertia force transmitted by the output end of the rotating shaft, so that the abnormal sound of the machine is caused. The abnormal sound easily causes the user to mistakenly think that the machine is damaged, the transmission structure is unstable or abnormal, which causes trouble to the user and the use experience of the machine is worsened.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric tool's reduction gears, it can effectively alleviate the big problem of moment of torsion of pivot to the axle lock when electrician's instrument shuts down.

In order to achieve the above object, the present invention provides a speed reducing mechanism for an electric tool, including a gear box, a rotating shaft, a bearing and an elastic member. The gear box is provided with a shaft cavity, and the inner wall of the shaft cavity is provided with a bearing groove and a speed reduction groove. The rotating shaft is arranged in the shaft cavity and can rotate relative to the gear box. The bearing is arranged in the bearing groove, and the rotating shaft is in interference fit with the inner wall of the bearing. The elastic piece is arranged in the deceleration groove and has friction force with the groove wall of the deceleration groove, and the elastic piece is sleeved on the rotating shaft and is in friction contact with the rotating shaft.

In one or more embodiments, in a natural state, an inner diameter of the elastic member is smaller than an outer diameter of the rotation shaft.

In one or more embodiments, the maximum thickness of the elastic member is smaller than the length of the deceleration groove 13 in the axial direction.

In one or more embodiments, the elastic member 2 includes an abutting portion having an arc-shaped cross section and a supporting portion having an arc-shaped or triangular cross section.

In one or more embodiments, the deceleration tank further comprises a protrusion provided at a side wall and/or a bottom wall of the deceleration tank.

In one or more embodiments, the protruding portion is provided in plurality, and the protruding portion is uniformly distributed around the circumferential direction of the rotating shaft.

In one or more embodiments, the deceleration tank further comprises a recess provided in a side wall and/or a bottom wall of the deceleration tank.

In one or more embodiments, the number of the recessed portions is multiple, the recessed portions are uniformly distributed around the circumference of the rotating shaft, the elastic member further includes positioning portions adapted to the recessed portions, and the positioning portions correspond to the recessed portions one to one.

The bearing groove is for encircleing the formation is established to the axle chamber and to the axle intracavity wall is concave, two have been seted up to the bearing groove, the gear reduction groove is for encircleing the axle chamber just establishes the formation to the axle intracavity wall is concave, the gear reduction groove is located two between the bearing groove, just the gear reduction groove is linked together with one of them bearing groove, the gear reduction groove is the annular groove, the elastic component be with gear reduction groove joint complex annular structure, the pivot still including with the holding ring of bearing joint location.

The utility model also provides an electric tool, this electric tool include electric tool's reduction gears.

Compared with the prior art, according to the utility model discloses an electric tool's reduction gears, elastic component provide moderate damping force for the pivot to the inertial force effect of pivot when this reduces the machine scram makes the faster stall of pivot, thereby effectively reduces the load of electric tool shaft lock under the scram state, prolongs the life of shaft lock. The utility model discloses the assembly is simple, with low costs, and annular structure's elastic component can also effectively reduce the reducing gear box grease and overflow from the output shaft end, improves the interior lubricated environment of gear box to be favorable to prolonging electric tool's life.

Drawings

Fig. 1 is a sectional view of a speed reducing mechanism of an electric power tool according to an embodiment of the present invention;

fig. 2 is an exploded view of a speed reducing mechanism of an electric power tool according to an embodiment of the present invention;

fig. 3 is a sectional view of an elastic member of a power tool according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a projection in a speed reduction groove of a power tool according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a depressed portion in a speed reduction groove of an elastic member of an electric power tool according to an embodiment of the present invention;

fig. 6 is a diagram showing a relationship between an elastic member and a positioning portion of an electric power tool according to an embodiment of the present invention.

Description of the main reference numerals:

1. a gear case; 11. a shaft cavity; 12. a bearing groove; 13. a deceleration tank; 131. a boss portion; 132. a recessed portion; 2. an elastic member; 21. an abutting portion; 22. a support portion; 23. a positioning part; 3. a bearing; 4. a rotating shaft; 41. a retaining ring.

Detailed Description

The following detailed description of the present invention is provided with reference to the accompanying drawings, but it should be understood that the scope of the invention is not limited by the detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations such as "comprises" or "comprising", etc., will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1 to 2, a speed reduction mechanism of an electric power tool according to an embodiment of the present invention includes a gear case 1, an elastic member 2, a bearing 3, and a rotation shaft 4. The gear box 1 is provided with a shaft cavity 11, the inner wall of the shaft cavity 11 is provided with a bearing groove 12 and a speed reducing groove 13, wherein the bearing groove 12 is communicated with the speed reducing groove 13. The rotating shaft 4 is installed in the shaft cavity 11, and the bearing 3 and the elastic element 2 are installed corresponding to the bearing groove 12 and the speed reduction groove 13 respectively. The rotating shaft 4 rotates relative to the gear housing 1 through the bearing 3. The elastic element 2 has a certain friction force with the bottom wall and the side wall of the deceleration tank 13. When shutting down, elastic component 2 receives the frictional force effect of deceleration tank 13, fixes in deceleration tank 13, and is rotatable frictional contact between elastic component 2 and the pivot 4, therefore elastic component 2 can provide certain frictional damping power for pivot 4 for the rotational speed of pivot 4 reduces, thereby makes pivot 4 stall more fast.

Specifically, as shown in fig. 1, the bearing groove 12 is an annular groove formed around the shaft cavity 11 and recessed toward the inner wall of the shaft cavity 11. Two bearing grooves 12 are formed, and a bearing 3 is installed in each bearing groove 12, so that the rotating shaft 4 can stably run. The outer wall of the rotating shaft 4 and the cavity wall of the shaft cavity 11 are respectively connected with the inner ring and the outer ring of the bearing 3 in an interference fit mode, so that the rotating shaft 4 can rotate relative to the bearing 3 and the gear box 1.

The decelerating groove 13 may be an annular groove, the elastic member 2 may be an annular structure, and the elastic member 2 is sleeved on the rotating shaft 4 and can rotate relative to the rotating shaft 4. Elastic component 2 joint just can rotate relative deceleration groove 13 in deceleration groove 13 for elastic component 2 can rely on the frictional force of the cell wall of deceleration groove 13 to provide certain frictional damping power to the operation of pivot 4, helps pivot 4 also to slow down fast to stall under the electric tool shut down condition.

In a preferred embodiment, the deceleration tank 13 further comprises a protrusion, and the protrusion 131 is disposed on a side wall and/or a bottom wall of the deceleration tank 13. The plurality of protrusions 131 are provided, and the protrusions 131 are uniformly distributed around the circumference of the rotating shaft 4. In another preferred embodiment, the deceleration tank 13 further comprises a recess 132, the recess 132 being provided in a side wall and/or a bottom wall of said deceleration tank 13. The recessed portion 132 is provided in plural, and the recessed portions 132 are uniformly distributed around the circumference of the rotating shaft 4. The provision of the convex portion 131 and the concave portion 132 facilitates dissipation of heat generated by friction of the elastic member 2 with the rotation shaft 4 and the deceleration grooves 13.

In a preferred embodiment, the elastic element 2 further includes positioning portions 23 corresponding to the recessed portions 132, and the positioning portions 23 correspond to the recessed portions 132 one by one, so that the elastic element 2 is engaged with the deceleration grooves 13, and only the inner ring of the elastic element 2 is used to provide a frictional damping force for decelerating the rotating shaft 4.

In a specific embodiment, the elastic member 2 includes an abutting portion 21 and a supporting portion 22, the abutting portion 21 has an arc-shaped cross section, and the supporting portion 22 has an arc-shaped or triangular cross section.

In an embodiment, the deceleration groove 13 is disposed adjacent to one of the bearing grooves 12, and the deceleration groove 13 is communicated with the bearing groove 12, and the elastic member 2 is installed in the deceleration groove 13 and is slidable relative to the outer ring of the bearing 3, so that a certain damping force is provided between the outer ring of the bearing 3 and the elastic member 2, thereby indirectly providing a damping force for the rotating shaft 4 and assisting in decelerating the rotating shaft 4.

As shown in fig. 1 and 2, in one embodiment, a positioning ring 41 is disposed around the circumference of the rotating shaft 4, and the positioning ring 41 facilitates positioning and installation of the rotating shaft 4, thereby improving efficiency and accuracy of installation.

The utility model discloses still include an electric tool, this electric tool includes electric tool's reduction gears.

To sum up, the utility model discloses an electric tool's reduction gears provides the rotation frictional force for elastic component 2 through

pivot

4, 13 inner walls of deceleration groove and the 3 outer rings of bearing to make elastic component 2 provide the damping force of moderate degree for the operation of pivot 4, with this inertia effect of pivot 4 when reducing the machine scram, thereby effectively reduce electric tool under the scram state load of shaft lock, the life of extension shaft lock. The utility model discloses the assembly is simple, with low costs, and annular structure's elastic component 2 can also effectively reduce the reducing gear box grease and be excessive from the output shaft end, improves 1 interior lubrication environment of gear box to be favorable to prolonging electric tool's life.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A speed reduction mechanism of a power tool, comprising:

the gearbox (1) is provided with a shaft cavity (11), and the inner wall of the shaft cavity (11) is provided with a bearing groove (12) and a speed reduction groove (13);

the rotating shaft (4) is arranged in the shaft cavity (11), and the rotating shaft (4) can rotate relative to the gear box (1);

the bearing (3) is arranged in the bearing groove (12), and the rotating shaft (4) is in interference fit with the inner wall of the bearing (3); and

the elastic piece (2) is arranged in the decelerating groove (13) and has friction force with the groove wall of the decelerating groove (13), and the elastic piece (2) is sleeved on the rotating shaft (4) and is in friction contact with the rotating shaft (4).

2. The reduction mechanism of the electric power tool according to claim 1, wherein an inner diameter of the elastic member (2) is smaller than an outer diameter of the rotary shaft (4) in a natural state.

3. The speed reducing mechanism of an electric power tool according to claim 1, wherein the maximum thickness of the elastic member (2) is smaller than the length of the speed reducing groove (13) in the axial direction.

4. The speed reducing mechanism of an electric tool according to claim 1, wherein the elastic member (2) includes an abutting portion (21) and a supporting portion (22), the abutting portion (21) has an arc-shaped cross section, and the supporting portion (22) has an arc-shaped or triangular cross section.

5. The reduction mechanism of the electric power tool according to claim 1, wherein the reduction gear groove (13) further comprises a projection (131), and the projection (131) is provided on a side wall and/or a bottom wall of the reduction gear groove (13).

6. The speed reducing mechanism of an electric power tool according to claim 5, wherein the plurality of protrusions (131) are provided, and the protrusions (131) are evenly distributed around the circumference of the rotating shaft (4).

7. The speed reducing mechanism of an electric power tool according to claim 1, wherein the speed reducing groove (13) further includes a recessed portion (132), and the recessed portion (132) is provided in a side wall and/or a bottom wall of the speed reducing groove (13).

8. The reduction mechanism of an electric power tool according to claim 7, wherein the recessed portion (132) is provided in plural, the recessed portions (132) are evenly distributed around the circumference of the rotary shaft (4), the elastic member (2) further includes positioning portions (23) corresponding to the recessed portions (132), and the positioning portions (23) correspond to the recessed portions (132) one to one.

9. The reduction mechanism of the electric tool according to claim 1, wherein the two bearing grooves (12) are formed around the shaft cavity (11) and are recessed toward the inner wall of the shaft cavity (11), the two bearing grooves (12) are formed, the two reduction grooves (13) are formed around the shaft cavity (11) and are recessed toward the inner wall of the shaft cavity (11), the reduction groove (13) is formed between the two bearing grooves (12), the reduction groove (13) is communicated with one of the bearing grooves (12), the reduction groove (13) is an annular groove, the elastic member (2) is an annular structure engaged with the reduction groove (13), and the rotating shaft (4) further includes a positioning ring (41) engaged with the bearing (3) for positioning.

10. A power tool including a speed reducing mechanism of the power tool according to any one of claims 1 to 9.