CN216618307U

CN216618307U - High-strength lightweight structure cold extrusion cross axle

Info

Publication number: CN216618307U
Application number: CN202122342934.1U
Authority: CN
Inventors: 周育江; 董小忠; 姜志恒; 叶连强; 赵珍
Original assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Current assignee: Wanxiang Qianchao Co Ltd; Wanxiang Group Corp
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-05-27
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses a cold extrusion cross shaft with a high-strength lightweight structure, which relates to the field of cross shafts and comprises a spherical body and four shaft heads, wherein the four shaft heads are formed by outwards extending from the upper direction, the lower direction, the left direction and the right direction of the body; the shaft head is connected with the body through a shaft shoulder, the shaft shoulder is of a multi-shoulder structure at least provided with two sections of shoulders, and the shaft shoulder is in transitional connection with the body through an inclined line section and a fillet section. By adopting the cross shaft product, the weight is reduced by 10% compared with the product designed by directly adopting the prior technical scheme, the maximum stress value is reduced by 17%, and high strength and light weight are realized; meanwhile, due to the design of the spherical pits and the flat plane on the body, burrs are reduced, the manual deburring process is eliminated, the production efficiency is improved, meanwhile, the service lives of the die and the ejector rod are prolonged, the die frame structure is simplified, the die frame manufacturing difficulty is reduced, and the production cost is reduced.

Description

High-strength lightweight structure cold extrusion cross axle

Technical Field

The utility model relates to the field of cross shafts, in particular to a cold extrusion cross shaft with a high-strength lightweight structure.

Background

With the development of automobiles in the directions of light weight, high speed and stability, cold extrusion is used as a precision processing method of forgings, has the advantages of precise size, material saving, high production efficiency, wide application range and the like, and is increasingly widely applied to the manufacturing of automobile parts. The universal joint is a key part of an automobile transmission system, and the strength of a cross shaft which is a core part directly influences the strength of the whole transmission shaft.

Chinese patent publication No. CN202301515U, published japanese patent No. 20120704, discloses a universal joint cross axle special for a cold extrusion one-step forming transmission shaft, wherein a body and a shaft head of the universal joint cross axle are in transition by adopting a fillet structure, and in the technical scheme, the problem of reducing stress at the fillet of the shaft head cannot be solved; chinese patent publication No. CN204041755U, published japanese 20141224 discloses a novel cold extrusion new construction universal joint cross, its cross body, axle circular bead and axis body are cold extrusion integrated into one piece structure, the transition between axle circular bead and the axis body is the arc transition of indent, the transition between axle circular bead and the axis body is the inclined plane transition, and among this technical scheme, the epaxial many shoulders structure of spindle adopts the inclined plane transition, but the maximum stress of cross is not overhead at the axle, and in the fillet department of axle head and body transition, still can't solve the problem that receives the size restriction, stress concentration when the transition fillet undersize. In summary, the prior art has the following drawbacks:

1. the direct fillet transition that adopts of cross axle spindle nose and middle body has restricted the design size of transition fillet on the one hand, and on the other hand, in order to guarantee product strength, the thickness of body in the middle of will having increased or the diameter that increases the spindle nose for two bad results appear in the cross axle design: the design weight is increased, the cost is increased, and the light weight of the product is not facilitated;

2. the outer side of the cross shaft body and the inner pits are in inclined surface enlarged arc transition, so that the outer side of the middle body is in a sharp angle shape, and when the cross shaft is formed by cold extrusion, the material at the position is not uniform in flow, a large amount of burrs are generated, and the product forming and subsequent processing are not facilitated;

3. when the concave pit of the middle body of the cross shaft is designed by adopting a frustum or a multi-side frustum, the shape of the concave pit is complex, the vertical fall of the whole middle part is large, the metal flow forming is not facilitated, the stress of the die and the ejector rod is increased, and the service life of the die and the ejector rod is influenced; when the polygonal frustum design is adopted, in order to ensure the angle of the concave pit, the ejector rod needs to be designed with an anti-rotation function, so that the structure of the die carrier is complicated, the stress position of the ejector rod is kept unchanged, and the local damage of the ejector rod is easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides the cold extrusion cross shaft with the high-strength light-weight structure, which has the advantages of improving the production efficiency, reducing the production cost and improving the product strength.

The purpose of the utility model is achieved by the following technical scheme: the cold extrusion cross shaft with the high-strength light-weight structure comprises a spherical body and four shaft heads which are formed by extending outwards from the upper direction, the lower direction, the left direction and the right direction of the body, wherein a blind hole is formed in the end surface of each shaft head; the shaft head is connected with the body through a shaft shoulder, the shaft shoulder is of a multi-shoulder structure at least provided with two sections of shoulders, and the shaft shoulder is in transitional connection with the body through an inclined line section and a fillet section.

As a preferred technical scheme, the width of the straight surface is more than or equal to 3 mm.

As a preferred technical scheme, the shaft shoulder is formed by adopting a one-time grinding processing technology.

According to a preferable technical scheme, the slope of the oblique line segment and the size of the fillet segment are adjusted and matched according to the stress on the cross shaft.

As a preferred technical scheme, the concave pit in the middle of the body is a spherical surface.

The utility model has the beneficial effects that:

1. the shaft head of the cross shaft and the middle body are designed with an inclined plane and fillet transition, and the size of the transition fillet can be adjusted according to the actual stress condition of a product due to the existence of the inclined plane, so that the use requirement is ensured; in addition, the design of the inclined surface transition can reduce the thickness of the middle body and well match with the shaft head, thereby reducing the design weight and realizing light weight;

2. a flat surface is designed on the outer side of the cross shaft body to be in transition with the middle concave pit, so that the material flow of the edge zone is reduced, and the formation of burrs is eliminated;

3. the concave pit of the middle body of the cross shaft is designed into a spherical shape, so that the material flow in each direction of the middle part is smooth and consistent, good forming is ensured, and the product strength is higher; and the ejector rod is correspondingly designed into a spherical shape, so that the ejector rod is more uniformly stressed and has a longer service life, the ejector rod is not limited by a rotation angle, the structure of the die carrier is simplified, and the manufacturing difficulty of the die carrier is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged schematic view of a region a in fig. 1.

Fig. 3 is a sectional view B-B of fig. 1.

Description of reference numerals: the shaft comprises a body 1, a shaft head 2, a blind hole 3, a spherical pit 4, a flat surface 5, an inclined line segment 6-1, a fillet segment 6-2 and a shaft shoulder 7.

Detailed Description

The utility model will be described in detail below with reference to the following drawings:

example (b): as shown in the attached drawings 1-3, the cold extrusion cross shaft with the high-strength light-weight structure comprises a spherical body 1 and four shaft heads 2 formed by outwards extending from the upper direction, the lower direction, the left direction and the right direction of the body 1, a blind hole 3 is formed in the end face of each shaft head 2, spherical pits 4 are symmetrically arranged on the front side and the rear side of the body 1, a circle of annular flat surface 5 is arranged along the outer edge of each spherical pit 4, and preferably, the width of the flat surface 5 is larger than or equal to 3 mm. The shaft head 2 is connected with the body 1 through a shaft shoulder 7, and the shaft shoulder 7 is formed by adopting a one-time grinding processing technology. The shaft shoulder 7 is of a multi-shoulder structure at least provided with two shoulders, and the shaft shoulder 7 is in transition connection with the body 1 through an inclined line section 6-1 and a fillet section 6-2. The slope of the oblique line section 6-1 and the size of the fillet section 6-2 are adjusted and matched according to the stress on the cross shaft. The central pit 4 of the body 1 is a spherical surface.

When the universal joint cross shaft works, the two opposite shaft heads 2 are under the action of alternating load, according to finite element simulation analysis, the maximum stress point is positioned at the transition position of the body 1 and the shaft shoulder 7, and a failure mode of fracture is easy to occur. Through the analysis of a certain actual product, the weight of the cross shaft product designed by the scheme of the utility model is reduced by 10 percent compared with the product designed by directly adopting the scheme of the prior art, the maximum stress value is reduced by 17 percent, and high strength and light weight are realized; meanwhile, due to the design of the spherical pits 4 and the flat surfaces 5 on the body 1, burrs are reduced, the manual deburring process is eliminated, the production efficiency is improved, meanwhile, the service lives of the die and the ejector rods are prolonged, the die frame structure is simplified, the die frame manufacturing difficulty is reduced, and the production cost is reduced.

It should be understood that equivalent alterations and modifications of the technical solution and the inventive concept of the present invention by those skilled in the art should fall within the scope of the appended claims.

Claims

1. The utility model provides a cold extruded cross of high strength lightweight structure which characterized in that: the novel bearing comprises a spherical body (1) and four shaft heads (2) which extend outwards from the upper direction, the lower direction, the left direction and the right direction of the body (1), wherein a blind hole (3) is formed in the end surface of each shaft head (2), spherical pits (4) are symmetrically arranged on the front side and the rear side of the body (1), and a circle of annular flat surface (5) is arranged along the outer edge of each spherical pit (4); the shaft head (2) is connected with the body (1) through a shaft shoulder (7), the shaft shoulder (7) is of a multi-shoulder structure at least provided with two shoulders, and the shaft shoulder (7) is in transitional connection with the body (1) through an inclined line segment (6-1) and a fillet segment (6-2).

2. The high-strength lightweight cold extruded cross shaft according to claim 1, wherein: the width of the straight surface (5) is more than or equal to 3 mm.

3. The high-strength lightweight cold extruded cross shaft according to claim 1, wherein: the shaft shoulder (7) is formed by adopting a one-step grinding process.

4. The high-strength lightweight cold extruded cross shaft according to claim 1, wherein: the slope of the oblique line section (6-1) and the fillet size of the fillet section (6-2) are adjusted and matched according to the stress on the cross shaft.