CN106593740B

CN106593740B - Starter and transmission device thereof

Info

Publication number: CN106593740B
Application number: CN201510661812.5A
Authority: CN
Inventors: 姚志高; 邓方敏
Original assignee: Bosch Automotive Products Changsha Co Ltd
Current assignee: The German auto parts Co. Ltd. Thorne lattice
Priority date: 2015-10-14
Filing date: 2015-10-14
Publication date: 2020-02-18
Anticipated expiration: 2035-10-14
Also published as: CN106593740A

Abstract

The application discloses starter and transmission thereof. A one-way clutch of a transmission includes an outer shaft member, an inner shaft member, and rollers mounted between the outer shaft member and the inner shaft member. Outer axle part is including having axial open-ended and accepting the chamber and forming in a plurality of projections of accepting the axial opposite side in chamber, including platform portion between a plurality of projections, smoothly passes through between projection and the platform portion, and every projection is installed respectively in rotary part's blind hole, and the axial tip contact blind hole's of projection bottom, platform portion contactless rotary part. The transmission device of the starter is not easy to damage and has long service life.

Description

Starter and transmission device thereof

Technical Field

The application relates to a starter, in particular to a transmission device of the starter.

Background

Modern motor vehicles typically use a starter to start the engine. Fig. 5 is a partially cross-sectional schematic view of a conventional starter, in which only the one-way clutch 1 and the transmission 200 directly power-connected to the one-way clutch 1 are shown enlarged for convenience of illustration. Referring to the schematic diagram of the outer shaft part 11 of the one-way clutch 1 shown in fig. 6, three studs 112 of the outer shaft part 11 are inserted into through holes 20 formed in the carrier 2 of the transmission 200, so as to realize the power coupling between the transmission 200 and the one-way clutch 1. Three bosses 114 are respectively arranged between the three convex columns 112 of the outer shaft component 11, and the bosses 114 are used for abutting against the end surface of the planet carrier 2, so that mutual axial positioning is realized. However, such an outer shaft component 11 is easily broken by cracks in the vicinity of the three bosses 114.

Accordingly, there is a need for improvement to overcome the technical problems in the prior art.

Disclosure of Invention

The main technical problem that this application will be solved is the easy problem of damaging of one-way clutch of starter.

To solve the above technical problem, in one aspect, the present application provides a transmission device, including:

a rotating member which rotates about its axis of rotation during operation and which includes a plurality of blind holes distributed away from its axis of rotation; and

a one-way clutch, comprising:

an outer shaft component, which comprises an accommodating cavity with an axial opening and a plurality of convex columns formed on the axial opposite sides of the accommodating cavity, wherein a platform part is arranged among the convex columns, the convex columns and the platform part are smoothly transited, each convex column is respectively installed in the blind hole, the axial end part of each convex column contacts the bottom of the blind hole, and the platform part does not contact the rotating component;

an inner shaft member mounted in the housing cavity coaxially with the outer shaft member through the axial opening; and

a roller mounted between the outer shaft member and the inner shaft member.

Optionally, the convex column is connected with the platform part through a transition part with a curvature radius not less than 2 mm.

Optionally, an axial gap between the platform portion and the rotating member is not less than 0.5 mm in a case where an axial end of the stud contacts a bottom of the blind hole.

Alternatively, the outer shaft component is cold extruded, the platform portion between the transition portions not having undulations exceeding 0.5 mm.

Optionally, the bottom of the accommodating cavity is provided with an axially through hole, and the plurality of convex columns are located at the periphery of the through hole.

Optionally, the protruding pillar is flush with the edge of the through hole.

Possibly, the opening part of the blind hole of the rotating component is provided with a chamfer, and the axial dimension of the chamfer is not less than 1.1 mm.

Possibly, the convex column is in clearance fit with the blind hole, and the axial size of the chamfer is not smaller than that of the transition part.

In another aspect, the present application provides a starter including an armature, a transmission, and a transmission according to the foregoing, wherein the armature outputs rotational power to the transmission, and the transmission outputs rotational power through the rotating member.

Optionally, the transmission is a planetary gear train transmission, and the rotating member belongs to a carrier of the planetary gear train.

Drawings

The present application will be more fully understood by reference to the following detailed description of specific embodiments in conjunction with the accompanying drawings. Wherein:

FIG. 1 is a schematic, partially cross-sectional view of a starter according to an embodiment of the present application, with only a transmission and a transmission in direct power connection with the transmission shown enlarged for ease of illustration;

FIG. 2 shows a schematic view of the outer shaft component shown in FIG. 1;

FIG. 3 shows a schematic view of the rotating part shown in FIG. 1 with the planet shafts temporarily not installed;

FIG. 4 shows a schematic view of another angle of the rotating member of FIG. 3;

FIG. 5 is a schematic partial cross-sectional view of a prior art starter, with only the one-way clutch and the transmission in direct power connection therewith shown enlarged for ease of illustration; and

fig. 6 shows a schematic view of the outer shaft component shown in fig. 5.

Detailed Description

Specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

Fig. 1 is a partially sectional schematic view of a starter according to an embodiment of the present application, in which only a transmission 100 and a transmission 200 directly power-connected to the transmission 100 are shown in an enlarged scale for convenience of description. Although the starter is not shown in its entirety in the drawings, those skilled in the art will appreciate that the starter may include components such as an armature and an electromagnetic switch, which are not shown in the drawings. Wherein, the electromagnetic switch can control the armature and the starter to work. When the armature is operated, the rotational power is output to the transmission 200, and the transmission 200 outputs the rotational power through the rotary member 2. In a possible embodiment as shown in the figures, the transmission 200 is a planetary gear set transmission.

Referring to fig. 3 to 4, the rotating member 2 rotates around the rotation axis X during operation, and includes three blind holes 20 and three through shaft holes 22 distributed away from the rotation axis X. The three blind holes 20 are of identical size and are distributed axisymmetrically with respect to the rotation axis X. Each blind hole 20 is substantially square, and two sides extending in the circumferential direction thereof are curved around the rotation axis X. The three through-holes 22 are of the same size and are distributed axially symmetrically about the axis of rotation X. The axle holes 22 are circular, the planet axles 24 are mounted in the axle holes 22, and each planet axle 24 is fixed in one of the axle holes 22, for example, by interference fit. A planetary gear 26 is mounted on each planetary shaft 24, each planetary gear 26 being of the same size and meshing with a respective sun gear 28. The center wheel 28 is provided with a spline 280 in the middle, an output shaft of the armature is connected with the spline 280, and when the transmission 200 is operated, the rotation power is input through the center wheel 28, and the rotation power is output through the rotating member 2 after the transmission 200 changes speed and changes torque. As can be seen from this, the rotating member 2 serves as a carrier of the planetary gear transmission 200.

Referring to fig. 2, the transmission 100 includes a rotating member 2 and a one-way clutch 1. The one-way clutch 1 includes an outer shaft member 11, an inner shaft member 12, and rollers 13 mounted between the outer shaft member 11 and the inner shaft member 12. In a possible embodiment, the outer shaft part 11 is made by a cold extrusion process. The outer axial component 11 includes a receiving cavity 110 having an axial opening 111. The inner shaft component 12 is mounted in the housing cavity 110 coaxially with the outer shaft component 11 through the axial opening 111.

The axially opposite sides of the receiving cavity 110 form a plurality of bosses 112. The plurality of convex columns 112 include a platform part 114, and the convex columns 112 and the platform part 114 are smoothly transited. The convex post 112 and the platform 114 are connected by a transition 116 having a radius of curvature of not less than 2 mm. The lands between the transitions 116 do not have undulations exceeding 0.5 millimeters. Since there is no sharp surface, local stress concentration is not easily caused in the process of manufacturing the outer shaft member 11, and thus the outer shaft member 11 is not easily fatigued to cause cracks. The bottom of the accommodating cavity 110 is provided with a through hole 118 which is axially through, and the plurality of convex columns 112 are positioned at the periphery of the through hole 118. Optionally, post 112 is flush with the edge of through-hole 118. The outer shaft component 11 according to the present application is not only simple and durable in structure, but also the cold extrusion molding die for manufacturing the outer shaft component 11 is simple in structure and low in manufacturing cost. A snap ring 14 is fitted to the inner shaft part 12 and an end cap 15 is riveted to the outer shaft part 11 to position the outer shaft part 11 and the inner shaft part 12 together.

Each of the bosses 112 is installed in the blind hole 20 in the rotating member 2, and an axial end 113 of the boss 112 contacts the bottom of the blind hole 20 and the platform 114 does not contact the rotating member 2. It is feasible that the axial clearance between the platform 114 and the rotating member 2 is not less than 0.5 mm in the case where the axial end 113 of the stud 112 contacts the bottom of the blind hole 20.

Possibly, a chamfer 202 is provided at the opening 201 of the blind hole 20 of the rotating member 2, and the axial dimension of the chamfer 202 is not less than 1.1 mm. The chamfer 202 may be at an angle of about 30 degrees, although one of ordinary skill in the art will appreciate that the chamfer 202 may be, for example, ± 1 degree, or ± 0.5 degrees, or ± 0.3 degrees. Possibly, the stud 112 is clearance-fitted with the blind hole 20 and the axial dimension of the chamfer 202 is not smaller than the transition 116.

The above detailed description is for illustrative purposes only and is not intended to be limiting, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the scope of the present disclosure. Therefore, all equivalent technical solutions are also within the scope of the present application, and the protection scope of the present application should be defined by the claims.

Claims

1. Transmission (100), characterized in that it comprises:

a rotating member (2) which, in operation, rotates about its axis of rotation and which comprises a plurality of blind holes (20) distributed away from its axis of rotation; and

one-way clutch (1) comprising:

an outer shaft component (11) which comprises a containing cavity (110) with an axial opening (111) and a plurality of convex columns (112) formed on the axial opposite sides of the containing cavity (110), wherein a platform part (114) is arranged among the convex columns (112), the convex columns (112) and the platform part (114) are smoothly transited, each convex column (112) is respectively installed in the blind hole (20), the axial end part (113) of each convex column (112) is contacted with the bottom of the blind hole (20), and the platform part (114) is not contacted with the rotating component (2);

an inner shaft member (12) mounted in the housing cavity (110) coaxially with the outer shaft member (11) through the axial opening (111); and

a roller (13) mounted between the outer shaft member (11) and the inner shaft member (12),

wherein the convex column (112) is connected with the platform part (114) through a transition part (116) with the curvature radius not less than 2 mm, and/or the axial clearance between the platform part (114) and the rotating component (2) is not less than 0.5 mm.

2. The transmission (100) according to claim 1, wherein the outer shaft component (11) is made by cold extrusion, the platform portion (114) between the transition portions (116) not having undulations exceeding 0.5 mm.

3. The transmission device (100) according to claim 1, wherein a through hole (118) is axially formed at a bottom of the receiving cavity (110), and the plurality of protruding pillars (112) are located at a periphery of the through hole (118).

4. The transmission (100) according to claim 3, wherein the stud (112) is flush with an edge of the through hole (118).

5. The transmission (100) according to claim 1, wherein a chamfer (202) is provided at the opening (201) of the blind hole (20) of the rotating member (2), the chamfer (202) having an axial dimension not less than 1.1 mm.

6. The transmission (100) of claim 5, wherein the lug (112) is clearance fit with the blind bore (20) and the chamfer (202) has an axial dimension no less than the transition (116).

7. Starter, characterized in that it comprises an armature, a transmission (200) and a transmission (100) according to any one of claims 1 to 6, wherein the armature outputs rotational power to the transmission (200), the transmission (200) outputting rotational power through the rotating part (2).

8. The starter according to claim 7, wherein the transmission (200) is a planetary gear train transmission, the rotating member (2) belonging to a carrier of the planetary gear train.