CN214741796U

CN214741796U - Isolator of high reliability

Info

Publication number: CN214741796U
Application number: CN202120602643.9U
Authority: CN
Inventors: 李拥军; 胡玉琨; 刘宇璐
Original assignee: Dongfeng Electric Drive Systems Co Ltd
Current assignee: Dongfeng Electric Drive Systems Co Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-11-16
Anticipated expiration: 2031-03-24

Abstract

The utility model discloses an isolator of high reliability, include: the hollow shaft is provided with a first inner circumferential surface, a second inner circumferential surface and a first step surface, wherein the first inner circumferential surface and the second inner circumferential surface are adjacent to each other, the first step surface is positioned at the connecting position of the first inner circumferential surface and the second inner circumferential surface, a first oblique spline is arranged on the first inner circumferential surface, and the diameter of the first inner circumferential surface is smaller than that of the second inner circumferential surface; the driving shaft is provided with a first outer peripheral surface, a second outer peripheral surface and a second step surface, the first outer peripheral surface is adjacent to the second outer peripheral surface, the second step surface is located at the connecting position of the first outer peripheral surface and the second outer peripheral surface, a second oblique spline is arranged on the first outer peripheral surface, the diameter of the first outer peripheral surface is smaller than that of the second outer peripheral surface, the number of the second oblique spline is the same as that of the first oblique spline, a first annular groove is designed at the end part of the driving shaft, a steel wire retainer ring is assembled, a limiting effect is achieved, the number of teeth of the splines in the hollow shaft does not need to be reduced, and the performance and the reliability of the isolator are improved.

Description

Isolator of high reliability

Technical Field

The utility model relates to an automobile starter technical field, concretely relates to isolator of high reliability.

Background

The isolator is an important part inside the automobile starter. The output end shaft of the isolator is provided with a spline and can be provided with a gear head, and the isolator slides back and forth under the action of the shifting fork to drive the gear head to be meshed with and separated from the flywheel gear ring of the engine. The input end of the one-way device is matched with the speed reducer to transmit the torque generated by the starter rotor to the gear head. Structurally, the isolator consists of mainly sleeve, outer cover, hollow shaft, driving shaft, rollers, spring, shifting fork ring, etc. When the starter works, the electromagnetic switch is firstly electrified to generate electromagnetic suction force, so that a driving shaft of the electromagnetic switch moves and drives a driving shaft of the isolator (a gear head is fixed on the driving shaft) to move axially to be meshed with a flywheel gear ring of the engine; referring to fig. 1 and 2, the hollow shaft of the one-way clutch does not move axially, the inner cavity is provided with oblique splines with odd number of teeth (assumed as a number a), the corresponding driving shaft is also provided with splines, and the splines are divided into 2 sections, one section has the odd number of teeth a, and the other section has the even number of teeth 2A. During assembly, when the driving shaft is inserted into the limit position of the hollow shaft, the odd-numbered teeth of the hollow shaft and the odd-numbered teeth of the driving shaft can be staggered, and when the driving shaft is moved reversely, the tooth spline of the driving shaft cannot move any more when the tooth spline of the driving shaft moves outwards to be in contact with the odd-numbered A section spline part of the hollow shaft, so that the maximum outward movement distance of the driving shaft is limited.

Because the number of the splines is 2A, in order to limit the maximum outward movement distance of the driving shaft, half of the number of the splines in the hollow shaft is removed, and only half of the splines of the driving shaft and the hollow shaft are matched to work, so that the strength of the splines is reduced, the shaking amount of the driving shaft on the hollow shaft is increased, and the performance and the reliability of the isolator are reduced.

The applicant needs to state that: the technical solutions described in the background are for the convenience of better understanding of the reader of the present invention, and thus the solutions described in the background do not necessarily constitute prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned technique not enough, provide an isolator of high reliability, solve at least one technical problem who proposes in the background art.

In order to achieve the above technical purpose, the technical solution of the utility model provides an isolator of high reliability, include:

the hollow shaft is provided with a first inner circumferential surface, a second inner circumferential surface and a first step surface, wherein the first inner circumferential surface and the second inner circumferential surface are adjacent to each other, the first step surface is positioned at the connecting position of the first inner circumferential surface and the second inner circumferential surface, a first oblique spline is arranged on the first inner circumferential surface, and the diameter of the first inner circumferential surface is smaller than that of the second inner circumferential surface;

the driving shaft is provided with a first outer peripheral surface, a second outer peripheral surface and a second step surface, the first outer peripheral surface and the second step surface are adjacent, the second oblique spline is arranged on the first outer peripheral surface, the diameter of the first outer peripheral surface is smaller than that of the second outer peripheral surface, the number of the second oblique spline is the same as that of the first oblique spline, the second oblique spline can be in sliding fit with the first oblique spline, the first inner peripheral surface is slidably sleeved on the first outer peripheral surface, the diameter of the second outer peripheral surface is larger than that of the first inner peripheral surface, a first annular groove is formed in one end, far away from the second step surface, of the first outer peripheral surface, a steel wire check ring is fixedly clamped in the first annular groove, and the first step surface limits the area where the steel wire check ring enters the first inner peripheral surface.

Furthermore, the high-reliability isolator further comprises a sleeve and rollers, wherein one end of the sleeve is open, the hollow shaft is sleeved with the open end of the sleeve, a plurality of accommodating grooves which are arranged in a circumferential array are formed between the inner circumferential surface of the sleeve and the outer circumferential surface of the hollow shaft in a surrounding manner, each accommodating groove comprises a first connecting section and a second connecting section which are sequentially communicated along the circumferential direction of the hollow shaft, the thickness of the first connecting section is smaller than that of the second connecting section, the rollers are multiple, the rollers are arranged in the accommodating grooves in a one-to-one correspondence manner, when the rollers move to positions close to the first connecting section, the rollers are in interference fit with the accommodating grooves, and when the rollers move to positions far away from the first connecting section, the rollers are in clearance fit with the accommodating grooves.

Furthermore, the high-reliability isolator further comprises a plurality of elastic pieces, the elastic pieces are arranged in the first connecting sections in a one-to-one correspondence mode, and one end of each elastic piece is connected to the roller.

Furthermore, the isolator with high reliability further comprises an outer cover, and the outer cover is coaxially buckled with the opening end of the sleeve.

Furthermore, the isolator with high reliability further comprises a sealing gasket and a gasket, wherein the sealing gasket and the gasket are laminated and clamped between the outer cover and the opening end of the sleeve.

Furthermore, a gear shaft is fixed on one side of the sleeve, which is far away from the outer cover.

Furthermore, a shifting fork retainer ring is fixedly sleeved on the second outer circumferential surface.

Compared with the prior art, the beneficial effects of the utility model include at least: the first annular groove is designed at the end part of the driving shaft, and the steel wire check ring is assembled to play a role in limiting, so that the number of teeth of the splines in the hollow shaft is not required to be reduced, and the performance and the reliability of the isolator are improved.

Drawings

Fig. 1 is a schematic cross-sectional view of a first embodiment of a high-reliability isolator provided by the present invention;

FIG. 2 is a schematic sectional view of the plane A-A in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a second embodiment of the high reliability isolator provided by the present invention;

fig. 4 is a schematic perspective view of a first embodiment of a driving shaft in a high-reliability isolator according to the present invention;

FIG. 5 is a schematic perspective view of a first embodiment of a high reliability isolator hollow mandrel provided by the present invention;

FIG. 6 is a side view schematically showing the construction of a drive shaft of the prior art isolator;

fig. 7 is a schematic perspective view of a hollow shaft of a related art isolator.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 7, the present embodiment provides a high reliability isolator, including: hollow shaft 1, drive shaft 2.

The hollow shaft 1 is provided with a first inner circumferential surface 1a, a second inner circumferential surface 1b and a first step surface 1c positioned at the connecting position of the first inner circumferential surface 1a and the second inner circumferential surface 1b, wherein the first inner circumferential surface 1a is provided with a first oblique spline 1d, and the diameter of the first inner circumferential surface 1a is smaller than that of the second inner circumferential surface 1 b; the driving shaft 2 is provided with a first outer peripheral surface 2a, a second outer peripheral surface 2b and a second step surface 2c located at the connecting position of the first outer peripheral surface 2a and the second outer peripheral surface 2b, the first outer peripheral surface 2a is provided with a second oblique spline 2d, the diameter of the first outer peripheral surface 2a is smaller than that of the second outer peripheral surface 2d, the number of the second oblique spline 2d is the same as that of the first oblique spline 1d, the second oblique spline 2d can be in sliding fit with the first oblique spline 1d, the first inner peripheral surface 1a is slidably sleeved on the first outer peripheral surface 2a, the diameter of the second outer peripheral surface 2b is larger than that of the first inner peripheral surface 1a, one end of the first outer peripheral surface 2a far away from the second step surface 2c is provided with a first annular groove 2e, and a steel wire retaining ring 3 is clamped and fixed in the first annular groove 2e, the first step surface 2c restricts entry of the wire retaining ring 3 into the area of the first inner peripheral surface 1 a.

Through have first ring channel 2e at the design of 2 tip of drive shaft, assemble a steel wire retaining ring 3, play limiting displacement to need not to reduce the number of teeth of hollow shaft 1 internal spline, improve isolator performance and reliability.

In this embodiment, the high-reliability isolator further comprises a sleeve 4 and a roller 5, one end of the sleeve 4 is open, the open end of the sleeve 4 is sleeved on the hollow shaft 1, a plurality of accommodating grooves which are arranged in a circumferential array are formed between the inner circumferential surface of the sleeve 4 and the outer circumferential surface of the hollow shaft 1 in a surrounding manner, each accommodating groove comprises a first connecting section and a second connecting section which are sequentially communicated along the circumferential direction of the hollow shaft 1, the thickness of the first connecting section is smaller than that of the second connecting section, a plurality of rollers 5 are provided, the plurality of rollers 5 are correspondingly arranged in the plurality of accommodating grooves one by one, when the roller 5 moves to a position close to the first connecting section, the roller is in interference fit with the accommodating groove, when the roller 5 moves to a position far away from the first connecting section, the roller is in clearance fit with the accommodating groove.

Lubricating grease is filled in a cavity (defined as a first cavity 1e) formed by the second inner circumferential surface 1b in a surrounding manner, in a preferable scheme of the embodiment, one end of the driving shaft 2, which is opposite to the first cavity 1e, is provided with a plurality of inclined holes 2f, the other ends of the inclined holes 2f extend to the positions (tooth space positions) between adjacent teeth of the second inclined spline 2d, and when the driving shaft 2 moves axially every time (when the one-way clutch is opened and closed, namely the driving shaft 2 performs axial reciprocating motion relative to the hollow shaft 1), grease injected into the surface of the second inclined spline 2d by the inclined holes 2f is replaced every time when the one-way clutch is opened and closed, so that the movement stability of the one-way clutch is improved.

Specifically, high reliability's isolator still include elastic component 6, elastic component 6 is a plurality of, and is a plurality of place in the elastic component 6 one-to-one in a plurality of first linkage segment to each the one end of elastic component 6 all connect in roller 5, its characterized in that, high reliability's isolator still include dustcoat 7, the coaxial lock of dustcoat 7 with the open end of sleeve 4, high reliability's isolator still include sealed 8 and packing ring 9, sealed 8, packing ring 9 range upon range of clamp are located dustcoat 7 with between the open end of sleeve 4, sleeve 4 deviates from one side of dustcoat 7 is fixed with gear shaft 10, the cover is established and is fixed with shift fork retaining ring 11 on second periphery 2 b.

The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A high reliability isolator, comprising:

the driving shaft is provided with a first outer peripheral surface, a second outer peripheral surface and a second step surface, the first outer peripheral surface and the second outer peripheral surface are adjacent to each other, the second step surface is located at the connecting position of the first outer peripheral surface and the second outer peripheral surface, a second oblique spline is arranged on the first outer peripheral surface, the diameter of the first outer peripheral surface is smaller than that of the second outer peripheral surface, the number of the second oblique spline is the same as that of the first oblique spline, the second oblique spline can be in sliding fit with the first oblique spline, the first inner peripheral surface is slidably sleeved on the first outer peripheral surface, the diameter of the second outer peripheral surface is larger than that of the first inner peripheral surface, one end of the second step surface on the basis of the principle of the first outer peripheral surface is provided with a first annular groove, a steel wire retainer ring is fixedly clamped in the first annular groove, and the first step surface limits the area where the steel wire retainer ring enters the first inner peripheral surface.

2. The high-reliability isolator according to claim 1, wherein the high-reliability isolator further comprises a sleeve and a plurality of rollers, one end of the sleeve is open, the open end of the sleeve is sleeved on the hollow shaft, a plurality of accommodating grooves are formed between the inner circumferential surface of the sleeve and the outer circumferential surface of the hollow shaft in a circumferential array, each accommodating groove comprises a first connecting section and a second connecting section which are sequentially communicated along the circumferential direction of the hollow shaft, the thickness of the first connecting section is smaller than that of the second connecting section, the plurality of rollers are arranged in the plurality of accommodating grooves in a one-to-one correspondence manner, when the rollers move to a position close to the first connecting section, the rollers are in interference fit with the accommodating grooves, when the rollers move to a position far away from the first connecting section, the roller is in clearance fit with the accommodating groove.

3. The high-reliability isolator as claimed in claim 2, further comprising a plurality of elastic members, wherein the plurality of elastic members are disposed in the plurality of first connecting sections in a one-to-one correspondence, and one end of each of the elastic members is connected to the roller.

4. The high reliability isolator of claim 2 further comprising a housing coaxially snap-fitted to the open end of said sleeve.

5. The isolator of claim 4, wherein the isolator further comprises a gasket and a gasket, and the gasket are sandwiched between the housing and the open end of the sleeve.

6. The high reliability isolator of claim 5 wherein a gear shaft is secured to a side of said sleeve facing away from said housing.

7. The isolator with high reliability as claimed in claim 6, wherein a shifting fork retainer ring is fixed on the second outer circumferential surface.