CN217926978U

CN217926978U - Speed reducing mechanism of starter

Info

Publication number: CN217926978U
Application number: CN202222244836.9U
Authority: CN
Inventors: 毛佳珺; 王文琴; 顾孜之; 黄之浩
Original assignee: Shanghai Valeo Automotive Electrical Systems Co Ltd
Current assignee: Shanghai Valeo Automotive Electrical Systems Co Ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-11-29
Anticipated expiration: 2032-08-25

Abstract

The utility model discloses a reduction gears of starter belongs to starter technical field. The speed reducing mechanism of the starter comprises a planetary wheel seat, a support, a plurality of planetary wheels, a driving shaft and a rotor shaft, wherein the planetary wheels are rotationally connected to the support, the first end of the driving shaft is connected to the support, the first end of the rotor shaft is rotationally connected with one end of the driving shaft, the other end of the rotor shaft is in driving connection with an external motor, an external gear sleeve is arranged on the rotor shaft, an inner gear ring is arranged on the planetary wheel seat, and the planetary wheels are respectively in meshing connection with the inner gear ring and the external gear sleeve; the planet wheel seat is of an integrally formed structure and made of plastic materials, the tooth-shaped length of the planet wheel is 9-10 mm, and the tooth-shaped length of the planet wheel seat is 9-14 mm. The utility model discloses a reduction gears of starter reduces the structure volume, increase of service life.

Description

Speed reducing mechanism of starter

Technical Field

The utility model relates to a starter technical field especially relates to a reduction gears of starter.

Background

The planet wheel seat of the speed reducing mechanism of the starter is usually made of plastic materials, so that the weight is guaranteed to be light, the rotational inertia is small, the quick starting and braking of the motor are facilitated, however, the abrasion resistance of the plastic materials is poor, and the planet wheel seat is easy to abrade, so that the service life of the speed reducing mechanism is short. In the prior art, the planet wheel seat is designed into an internal and external split structure, the internal structure is made of metal materials, the external structure is made of plastic materials, and the metal materials have better wear resistance, so that the service life of the planet wheel seat is prolonged.

Therefore, a reduction mechanism of a starter is needed to solve the above existing problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a reducing mechanism of starter reduces the structure volume, increase of service life.

To achieve the purpose, the utility model adopts the following technical proposal:

the reduction mechanism of the starter comprises a planet wheel seat, a support, a plurality of planet wheels, a driving shaft and a rotor shaft, wherein the planet wheels are rotationally connected to the support, the first end of the driving shaft is connected to the support, the first end of the rotor shaft is rotationally connected with one end of the driving shaft, the other end of the rotor shaft is in driving connection with an external motor, an external gear sleeve is arranged on the rotor shaft, an inner gear ring is arranged on the planet wheel seat, and the planet wheels are respectively in meshing connection with the inner gear ring and the external gear sleeve;

the planet wheel seat is of an integrally formed structure and is made of a plastic material, the tooth-shaped length of the planet wheel is 9-10 mm, and the tooth-shaped length of the planet wheel seat is 9-14 mm.

In some possible embodiments, the planet wheels can axially move relative to the planet wheel base, and the tooth-shaped length of the planet wheels is smaller than the tooth-shaped length of the inner gear ring of the planet wheel base.

In some possible embodiments, the planetary gear set further comprises a pin shaft and a needle bearing, the pin shaft is fixed to the support, the planetary gear is sleeved and tightly fitted on the needle bearing, the needle bearing is sleeved and loosely fitted on the pin shaft, and the needle bearing can axially move along the pin shaft.

In some possible embodiments, the planetary gear set further comprises a first bushing, the first bushing is disposed on the driving shaft, the planetary wheel seat is provided with an inner hole, the first bushing is mounted in the inner hole, and the driving shaft is rotatably connected to the planetary wheel seat through the first bushing.

In some possible embodiments, the inner hole is a stepped hole, and the bracket abuts against a stepped surface of the stepped hole.

In some possible embodiments, the driving shaft is provided with a slot, the second bushing is mounted in the slot, the rotor shaft is arranged in the second bushing in a penetrating manner, and the rotor shaft is rotatably connected to the driving shaft through the second bushing.

In some possible embodiments, the driving shaft and the bracket are riveted, and two protrusions formed by the driving shaft abut against two side surfaces of the bracket respectively.

In some possible embodiments, the planetary gear set further includes a cover plate connected to the planetary gear seat, the cover plate and the planetary gear seat form an accommodating space, and the carrier, the planetary gear, and the outer gear sleeve of the rotor shaft are all disposed in the accommodating space.

In some possible embodiments, the cover plate is provided with a clamping groove, and a buckle is arranged at an end of the planet wheel base and penetrates through the clamping groove to enable the cover plate to be clamped on the planet wheel base.

The utility model has the advantages that:

the utility model provides a speed reducing mechanism of starter, the planet wheel seat is fixed to be set up, when the external motor drives the rotor shaft to rotate, the rotor shaft drives the outer gear sleeve to rotate, the planet wheel meshes with outer gear sleeve and inner gear ring respectively to be connected, thus make the support rotate, the support drives the drive shaft to rotate; through the tooth number configuration of planet wheel and outer tooth sleeve, realized the speed reduction of drive shaft and rotated. The planet wheel seat is made of plastic materials, is of an integrally formed structure, is simple in structure and can reduce the radial size of the outer contour compared with the existing split structure, so that the overall size is reduced, the cost is reduced, the rotary inertia is reduced by reducing the size, and the quick starting and quick braking of the motor are facilitated. Compared with the traditional structure, the tooth-shaped length of the planet wheel and the tooth-shaped length of the planet wheel seat are both prolonged, the meshing length between the planet wheel seat and the planet wheel is increased, the stress area is increased, and the pressure intensity borne by a single tooth in a meshing state is reduced, so that the service life of the planet wheel seat is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a speed reduction mechanism of a starter according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the reduction mechanism of the starter provided by the embodiment of the present invention with the planetary wheel seat and the cover plate removed;

fig. 3 is a front view of the reduction mechanism of the starter according to the embodiment of the present invention with the planetary wheel seat and the cover plate removed;

FIG. 4 isbase:Sub>A cross-sectional view A-A of FIG. 3;

FIG. 5 is an enlarged view at B of FIG. 4;

fig. 6 is a schematic structural diagram of a planetary wheel seat according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a cover plate according to an embodiment of the present invention.

In the figure:

1. a planetary wheel seat; 11. an inner gear ring; 12. buckling; 13. an inner bore; 131. a step surface; 2. a support; 3. a planet wheel; 4. a drive shaft; 41. a slot; 42. a protrusion; 5. a rotor shaft; 51. an outer gear sleeve; 6. a pin shaft; 7. a needle bearing; 8. a first bushing; 9. a second bushing; 10. a cover plate; 101. a clamping groove.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention, and the technical effects achieved by the present invention clearer, the following detailed description will be made with reference to the accompanying drawings for further describing the technical solutions of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The embodiment provides a speed reducing mechanism of a starter, as shown in fig. 1-3, the speed reducing mechanism comprises a planetary wheel seat 1, a support 2, a plurality of planetary wheels 3, a driving shaft 4 and a rotor shaft 5, the planetary wheels 3 are rotatably connected to the support 2, a first end of the driving shaft 4 is connected to the support 2, a first end of the rotor shaft 5 is rotatably connected to one end of the driving shaft 4, the other end of the rotor shaft 5 is in driving connection with an external motor, an external gear sleeve 51 is arranged on the rotor shaft 5, the planetary wheel seat 1 is provided with an internal gear ring 11, and the planetary wheels 3 are respectively in meshing connection with the internal gear ring 11 and the external gear sleeve 51. Through the structural connection, the planetary wheel seat 1 is fixedly arranged, when an external motor works to drive the rotor shaft 5 to rotate, the rotor shaft 5 drives the outer gear sleeve 51 to rotate, the planetary wheel 3 is respectively meshed with the outer gear sleeve 51 and the inner gear ring 11, the rotating speed is transmitted to the planetary wheel 3 through the rotor shaft 5 and then transmitted to the planetary wheel seat 1, after the speed is reduced, the planetary wheel 3 drives the support 2 to rotate, the support 2 drives the driving shaft 4 to rotate, the torque is output, and the torque at the moment is amplified after the speed is reduced; through the tooth number configuration of planet wheel 3 and outer gear sleeve 51, the torque that rotor shaft 5 input is exported by drive shaft 4 after amplifying, has played the effect that reduces drive shaft 4 rotational speed amplification moment.

Planet wheel seat 1 is made by the plastics material, and planet wheel seat 1 is the integrated into one piece structure, for current split type planet wheel seat 1, simple structure can reduce the radial dimension of outline to reduce whole volume, thereby allow the starter stator compacter, make nimble arranging to become possible, because whole volume reduces, make inertia reduce, be favorable to the motor to start fast, quick braking. The tooth form length of the planet wheel 3 is 9mm-10mm, the tooth form length of the planet wheel seat 1 is 9mm-14mm, compared with the traditional structure, the tooth form length of the planet wheel 3 and the tooth form length of the planet wheel seat 1 are both prolonged, the meshing length between the planet wheel seat 1 and the planet wheel 3 is increased, the pressure intensity borne by a single tooth in a meshing state is reduced, the stress area is increased, and therefore the service life of the planet wheel seat 1 is prolonged. Through the arrangement, the problems of short service life, complex structure, large volume and heavy mass of the speed reducing mechanism are solved.

In this embodiment, the support 2 is rotatably connected with three planet wheels 3, which are uniformly spaced around the outer circumference of the outer gear sleeve 51 and are meshed with the outer gear sleeve 51.

In one embodiment, the planet wheels 3 are able to move axially, typically very slightly, relative to the planet wheel carrier 1; furthermore, the tooth-shaped length of the planet wheel 3 is smaller than that of the inner gear ring 11 of the planet wheel seat 1, so that the planet wheel 3 is always engaged with the planet wheel seat 1, the engagement reliability is improved, and the transmission reliability is further improved.

In one embodiment, as shown in fig. 4 and 5, the speed reducing mechanism of the starter further includes a pin 6 and a needle bearing 7, the pin 6 is fixed to the bracket 2, the planet wheel 3 is sleeved and tightly fitted on the needle bearing 7, the needle bearing 7 is sleeved and loosely fitted on the pin 6, the needle bearing 7 can axially float along the pin 6, the planet wheel 3 drives the pin 6 to rotate through the needle bearing 7, and the pin 6 drives the bracket 2 to rotate.

In an embodiment, the tooth-shaped length of the planet wheel 3 can be 9, 10 or any value between 9 and 10, and the tooth-shaped length of the inner gear ring 11 of the planet wheel seat 1 can be 9, 10, 11, 12, 13, 14 or any value between them, which are specifically set according to the actual installation space and the structural simulation, etc., and the use requirements such as structural strength, etc. can be met. In this embodiment, the tooth length of the planet wheel 3 is 9.6mm.

In an embodiment, as shown in fig. 5 and 6, the speed reducing mechanism of the starter further includes a first bushing 8, the first bushing 8 is sleeved on the driving shaft 4, the planetary wheel seat 1 is provided with an inner hole 13, the first bushing 8 is installed in the inner hole 13, the driving shaft 4 is rotatably connected to the planetary wheel seat 1 through the first bushing 8, friction force between the driving shaft 4 and the planetary wheel seat 1 is reduced, internal sealing of the planetary wheel seat 1 is achieved through the first bushing 8, internal protection is achieved, and reliability is improved. In one embodiment, as shown in fig. 6, the inner hole 13 is a stepped hole, and the bracket 2 abuts against a stepped surface 131 of the stepped hole to realize axial limiting.

In one embodiment, as shown in fig. 1 and 7, the speed reducing mechanism of the starter further includes a cover plate 10, the cover plate 10 is connected to the planetary wheel seat 1, the cover plate 10 and the planetary wheel seat 1 form an accommodating space, the carrier 2, the planetary wheel 3 and the outer gear sleeve 51 of the rotor shaft 5 are all arranged in the accommodating space, and the accommodating space forms protection for internal structures, so that the service life is prolonged. In one embodiment, as shown in fig. 1 and 7, the cover plate 10 is provided with a locking groove 101, the end of the planetary wheel base 1 is provided with a locking buckle 12, and the locking buckle 12 is inserted into the locking groove 101 to lock the cover plate 10 to the planetary wheel base 1, so as to facilitate the assembly and disassembly of the cover plate 10 and the planetary wheel base 1. Further, the cover plate 10 is in sealing connection with the planet wheel seat 1, so that the accommodating space is a sealed space, the protection performance is improved, and particularly, the sealing connection mode can adopt the prior art and is not repeated.

In one embodiment, as shown in fig. 5, the speed reducing mechanism of the starter further includes a second bushing 9, the driving shaft 4 is provided with a slot 41, the second bushing 9 is installed in the slot 41, the rotor shaft 5 penetrates through the second bushing 9, and the rotor shaft 5 is rotatably connected to the driving shaft 4 through the second bushing 9, so that circumferential limiting of the rotor shaft 5 is realized, and installation reliability is improved; furthermore, the end of the outer gear sleeve 51 is abutted against the support 2, so that axial limiting is realized, and the mounting reliability is improved. Further, the outer sleeve 51 and the rotor shaft 5 are of an integral structure.

In one embodiment, as shown in fig. 5, the driving shaft 4 and the bracket 2 are riveted, and two protrusions 42 formed by the driving shaft 4 abut against two side surfaces of the bracket 2 respectively, so that circumferential and axial limiting of the driving shaft 4 and the bracket 2 is realized, and the connection stability of the driving shaft 4 and the bracket 2 is improved.

During assembly, on one hand, the pin shaft 6 is pressed into the support 2, the needle roller bearing 7 is pressed into the planet wheel 3, and the needle roller bearing 7 is sleeved on the pin shaft 6; on the other hand, the drive shaft 4 is connected to the planetary carrier 1 through a first bushing 8; the carrier 2 with the planet wheels 3 is then fitted on the drive shaft 4, and the rotor shaft 5 is connected to the drive shaft 4 via the second bushing 9.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The speed reducing mechanism of the starter is characterized by comprising a planet wheel seat (1), a support (2), a plurality of planet wheels (3), a driving shaft (4) and a rotor shaft (5), wherein the planet wheels (3) are rotationally connected to the support (2), the first end of the driving shaft (4) is connected to the support (2), the first end of the rotor shaft (5) is rotationally connected with one end of the driving shaft (4), the other end of the rotor shaft (5) is in driving connection with an external motor, an external gear sleeve (51) is arranged on the rotor shaft (5), an internal gear ring (11) is arranged on the planet wheel seat (1), and the planet wheels (3) are respectively in meshing connection with the internal gear ring (11) and the external gear sleeve (51);

the planet wheel seat (1) is of an integrally formed structure, the planet wheel seat (1) is made of a plastic material, the tooth-shaped length of the planet wheel (3) is 9-10 mm, and the tooth-shaped length of the planet wheel seat (1) is 9-14 mm.

2. The reduction mechanism of the starter according to claim 1, characterised in that the planet wheels (3) are axially movable relative to the planet wheel holder (1), the tooth length of the planet wheels (3) being smaller than the tooth length of the inner ring gear (11) of the planet wheel holder (1).

3. The reduction mechanism of the starter according to claim 1, further comprising a pin (6) and a needle bearing (7), wherein the pin (6) is fixed to the bracket (2), the planet gear (3) is sleeved and tightly fitted on the needle bearing (7), the needle bearing (7) is sleeved and loosely fitted on the pin (6), and the needle bearing (7) can axially move along the pin (6).

4. The reduction mechanism of a starter according to claim 1, further comprising a first bushing (8), wherein the first bushing (8) is sleeved on the driving shaft (4), the planetary wheel seat (1) is provided with an inner hole (13), the first bushing (8) is mounted in the inner hole (13), and the driving shaft (4) is rotatably connected to the planetary wheel seat (1) through the first bushing (8).

5. The reduction mechanism of a starter according to claim 4, wherein the inner hole (13) is a stepped hole, and the holder (2) abuts on a stepped surface (131) of the stepped hole.

6. The reduction mechanism of a starter according to claim 1, further comprising a second bushing (9), wherein the drive shaft (4) is provided with a slot (41), the second bushing (9) is mounted in the slot (41), the rotor shaft (5) is inserted into the second bushing (9), and the rotor shaft (5) is rotatably connected to the drive shaft (4) through the second bushing (9).

7. The reduction mechanism of a starter according to claim 1, wherein the drive shaft (4) and the bracket (2) are riveted, and two protrusions (42) formed on the drive shaft (4) abut against two side surfaces of the bracket (2), respectively.

8. The reduction mechanism of a starter according to any one of claims 1 to 7, further comprising a cover plate (10), the cover plate (10) being connected to the planetary carrier (1), the cover plate (10) and the planetary carrier (1) forming a receiving space, the carrier (2), the planet wheels (3) and the outer gear sleeve (51) of the rotor shaft (5) all being disposed in the receiving space.

9. The reduction mechanism of the starter according to claim 8, wherein the cover plate (10) is provided with a clamping groove (101), the end of the planet wheel base (1) is provided with a buckle (12), and the buckle (12) penetrates through the clamping groove (101) to enable the cover plate (10) to be clamped on the planet wheel base (1).