CN113738780A - Structural design method of high-strength retainer for ball cage type constant velocity universal joint - Google Patents

Abstract

The invention relates to a structural design method of a high-strength retainer, in particular to a structural design method of a high-strength retainer for a ball cage type constant velocity universal joint. The following design method is carried out: increasing the cage width, i.e. increasing the dimensions a1, a 2: increasing the width B of the window beam, and designing four-small-two-large windows, namely reducing the sizes L1 and L2: designing the diameter of the inner spherical surface of the retainer; the aperture of the cage and the steel ball are preferably in an interference fit. Further increasing the strength of the retainer and increasing the safety performance of use.

Description

Structural design method of high-strength retainer for ball cage type constant velocity universal joint

Technical Field

The invention relates to a structural design method of a high-strength retainer, in particular to a structural design method of a high-strength retainer for a ball cage type constant velocity universal joint.

Background

The fixed end ball cage type retainer of the sand beach vehicle such as ATV, UTV and the like is designed according to the routine design of a passenger vehicle retainer, and the retainer often has rupture failure due to insufficient strength under severe working conditions.

Chinese patent CN201720955700.5 discloses a hub bearing for a beach vehicle. The bearing of the dune buggy needs to work under the condition that water, sand, stones and the like exist, and external mud, sand, water and the like easily enter the bearing, so that the bearing is abraded, the service life is short, and the use cost is high. The utility model relates to a sand beach vehicle wheel hub bearing, which comprises an outer ring, an inner ring, a steel ball and a retainer, wherein one end of the retainer is provided with a conical bulge which is opposite to the rectangular bulge of the inner ring for positioning; two ends of the bearing are provided with protective rings; the protection ring comprises first retaining ring, labyrinth circle and second retaining ring, and the labyrinth circle inlays to be established at second retaining ring both ends, and the labyrinth circle sets up two inclined sealing strips at first retaining ring axial, radially sets up a sealing strip at first retaining ring, and still is equipped with in the protection ring of one end and inlays the magnetism circle of establishing in the first retaining ring outside.

Disclosure of Invention

The invention mainly solves the defects in the prior art and provides a structural design method of a high-strength retainer for a ball cage type constant velocity universal joint, which further increases the strength of the retainer and increases the use safety performance.

The technical problem of the invention is mainly solved by the following technical scheme:

a structural design method of a high-strength retainer for a ball-cage constant velocity universal joint is carried out according to the following design method:

increasing the width of the retainer, namely increasing the sizes A1 and A2:

the size of A1 is increased, and A2 ensures that the inner star wheel can be installed, namely A1 is not equal to A2, and the sizes of A1 and A2 are designed as follows:

A1＝0.6～0.68*d

A2＝0.5～0.55*d；

secondly, increasing the width B of the window beam, and designing four small and two large windows, namely reducing the sizes L1 and L2:

l1 is to guarantee the interior star gear can pack into can, L2 is to guarantee the steel ball has the clearance of rolling activity in the lane can, and L1, L2 size design are as follows:

L1＝1.39～1.41*d

L2＝1.26～1.27*d；

the periphery of the window hole of the L1 is designed into a large fillet transition as much as possible, the empirical value is generally R3 and above,

the periphery of the window hole of the L2 is designed into a large fillet transition as much as possible, and the empirical value is generally R6 or above; so as to increase the strength in order to design the maximum width of the window sill;

thirdly, the diameter of the inner spherical surface of the retainer is designed, and according to geometric knowledge, when the universal joint swings to a maximum angle of 47 degrees, the maximum stress tangent point of the steel ball is contained in the inner spherical surface of the window hole of the retainer, and D1 is 3.20-3.22 x D;

the diameter of the outer spherical surface of the retainer is designed, and according to geometric knowledge, when the universal joint swings to a maximum angle of 47 degrees, the maximum stress tangent point of the steel ball is contained in the outer spherical surface of the window hole of the retainer, and D2 is 3.70-3.72 x D;

recommending SAE8617H as a high-strength retainer material, carrying out carburizing and quenching heat treatment, wherein the surface hardness is 58-62 HRC, and the hardened layer is 0.6-1.0 mm;

sixthly, the window hole of the retainer and the steel ball are recommended to be in interference fit, the interference range is 0-0.02 mm, the window hole, the outer spherical surface and the inner spherical surface are ground, the surface roughness of the window hole is Ra1.6 or less, and the surface roughness of the outer spherical surface and the inner spherical surface is Ra0.8 or less.

Has the advantages that:

through the optimization of the structural design of the retainer, the improvement of the window design greatly improves the strength of the retainer, and the advanced concrete expression of the technology is as follows:

1. the cage crush force was increased, and typical data from the test were as follows:

the crushing force of the AC68 standard is increased from 23-25 kN to 40-42 kN,

the crushing force of the AC75 standard is improved from 35-37 kN to 62-64 kN

2. The retainer is prevented from being broken in a static torsion strength test at a large angle;

3. the retainer is ensured not to break when the quasi static torsion strength test is carried out under a large angle;

4. the retainer is prevented from being broken in a torsion fatigue test under a large angle;

5. the requirement of abuse test under the limit working condition of ATV and UTV vehicle types is met.

Drawings

FIG. 1 is a schematic view of the structure of a cage according to the present invention;

FIG. 2 is a schematic cross-sectional view of C-C of FIG. 1;

fig. 3 is a schematic sectional structure view of S-S in fig. 2.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments.

Example 1: a structural design method of a high-strength retainer for a ball-cage constant velocity universal joint is carried out according to the following design method:

increasing the width of the retainer, namely increasing the sizes A1 and A2:

the size of A1 is increased, and A2 ensures that the inner star wheel can be installed, namely A1 is not equal to A2, and the sizes of A1 and A2 are designed as follows:

A1＝0.6～0.68*d

A2＝0.5～0.55*d；

secondly, increasing the width B of the window beam, and designing four small and two large windows, namely reducing the sizes L1 and L2:

l1 is to guarantee the interior star gear can pack into can, L2 is to guarantee the steel ball has the clearance of rolling activity in the lane can, and L1, L2 size design are as follows:

L1＝1.39～1.41*d

L2＝1.26～1.27*d；

the periphery of the window hole of the L1 is designed into a large fillet transition as much as possible, the empirical value is generally R3 and above,

the periphery of the window hole of the L2 is designed into a large fillet transition as much as possible, and the empirical value is generally R6 or above;

thirdly, the diameter of the inner spherical surface of the retainer is designed, and according to geometric knowledge, when the universal joint swings to a maximum angle of 47 degrees, the maximum stress tangent point of the steel ball is contained in the inner spherical surface of the window hole of the retainer, and D1 is 3.20-3.22 x D;

the diameter of the outer spherical surface of the retainer is designed, and according to geometric knowledge, when the universal joint swings to a maximum angle of 47 degrees, the maximum stress tangent point of the steel ball is contained in the outer spherical surface of the window hole of the retainer, and D2 is 3.70-3.72 x D;

recommending SAE8617H as a high-strength retainer material, carrying out carburizing and quenching heat treatment, wherein the surface hardness is 58-62 HRC, and the hardened layer is 0.6-1.0 mm;

sixthly, the window hole of the retainer and the steel ball are recommended to be in interference fit, the interference range is 0-0.02 mm, the window hole, the outer spherical surface and the inner spherical surface are ground, the surface roughness of the window hole is Ra1.6 or less, and the surface roughness of the outer spherical surface and the inner spherical surface is Ra0.8 or less.

Claims (1)

1. A structural design method of a high-strength retainer for a ball-cage type constant velocity universal joint is characterized by comprising the following steps:

increasing the width of the retainer, namely increasing the sizes A1 and A2:

the size of A1 is increased, and A2 ensures that the inner star wheel can be installed, namely A1 is not equal to A2, and the sizes of A1 and A2 are designed as follows:

A1＝0.6～0.68*d

A2＝0.5～0.55*d；

secondly, increasing the width B of the window beam, and designing four small and two large windows, namely reducing the sizes L1 and L2:

l1 is to guarantee the interior star gear can pack into can, L2 is to guarantee the steel ball has the clearance of rolling activity in the lane can, and L1, L2 size design are as follows:

L1＝1.39～1.41*d

L2＝1.26～1.27*d；

the periphery of the window hole of the L1 is designed into a large fillet transition as much as possible, the empirical value is generally R3 and above,

the periphery of the window hole of the L2 is designed into a large fillet transition as much as possible, and the empirical value is generally R6 or above;

thirdly, the diameter of the inner spherical surface of the retainer is designed, and according to geometric knowledge, when the universal joint swings to a maximum angle of 47 degrees, the maximum stress tangent point of the steel ball is contained in the inner spherical surface of the window hole of the retainer, and D1 is 3.20-3.22 x D;

the diameter of the outer spherical surface of the retainer is designed, and according to geometric knowledge, when the universal joint swings to a maximum angle of 47 degrees, the maximum stress tangent point of the steel ball is contained in the outer spherical surface of the window hole of the retainer, and D2 is 3.70-3.72 x D;

recommending SAE8617H as a high-strength retainer material, carrying out carburizing and quenching heat treatment, wherein the surface hardness is 58-62 HRC, and the hardened layer is 0.6-1.0 mm;

sixthly, the window hole of the retainer and the steel ball are recommended to be in interference fit, the interference range is 0-0.02 mm, the window hole, the outer spherical surface and the inner spherical surface are ground, the surface roughness of the window hole is Ra1.6 or less, and the surface roughness of the outer spherical surface and the inner spherical surface is Ra0.8 or less.

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