High-strength inverted universal joint retainer

Abstract

The utility model discloses a high-strength inverted universal joint retainer. A plurality of windows for steel balls to slide are formed in a retainer body; the retainer body is of a non-centrosymmetric structure with the center line of the window as the axis. One end of the retainer body is a large-opening end, and the other end of the retainer body is a small-opening end; the length a of the small-opening end is greater than the length b of the large-opening end; when the retainer is assembled with the outer wheel, the inner wheel and the steel balls, the large opening end of the retainer and the opening of the outer wheel face the same direction; and when the ball cage swings to the maximum angle, the tail end of the small opening end of the retainer wraps the PCD center of the inner wheel. The small opening end of the retainer is lengthened, it is guaranteed that the edge of the retainer exceeds the PCD center of the inner wheel by 0.4 mm-0. 8mm when the ball cage swings, and the retainer is designed to be of an asymmetric structure; when the retainer is assembled with the outer wheel, the inner wheel and the steel balls, the large opening end of the retainer and the opening part of the outer wheel face the same direction; therefore, the stress at the weak part of the retainer is dispersed, the strength of the retainer is enhanced, and the service life of the retainer is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of universal joint retainers, in particular to a high-strength inverted universal joint retainer. Background Art

[0002] New energy vehicle designs currently on the market generally demand high torque while also requiring light weight and a small footprint. To meet these requirements, compact ball cages are increasingly being chosen. However, while reducing weight and footprint, this inevitably reduces the thickness of individual components, leading to failure to withstand the higher yield strength and resulting in breakage. The drawbacks of traditional segmented ball cages are also becoming increasingly apparent, primarily manifesting in cage fracture.

[0003] The existing design of the ball cage retainer in the industry is mostly centrosymmetrical. It is precisely because of this centrosymmetrical design that when the ball cage swings, the retainer cannot envelop the PCD center of the inner wheel, causing the stress on the retainer to be concentrated at the weak point of the retainer mouth, which can easily cause the retainer to break. Summary of the Invention

[0004] In order to solve the defects existing in the prior art, the purpose of the present utility model is to provide a high-strength inverted universal joint retainer, the small end of the retainer is lengthened to ensure that the edge of the retainer exceeds the center of the inner wheel PCD by 0.4mm to 0.8mm when the ball cage swings, and is designed as an asymmetric structure; and when the retainer is assembled with the outer wheel, inner wheel, and steel ball, the large end of the retainer is oriented in the same direction as the outer wheel mouth; thereby dispersing the force at the weak points of the retainer, enhancing the strength of the retainer, and extending the service life of the retainer.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a high-strength inverted universal joint retainer, including a retainer body, on which a plurality of windows for the sliding of steel balls are opened; with the center line of the windows as the axis, the retainer body is a non-center-symmetrical structure; one end of the retainer body is a large-mouth end, and the other end is a small-mouth end; the length a of the small-mouth end is greater than the length b of the large-mouth end; when the retainer is assembled with the outer wheel, the inner wheel and the steel ball, the large-mouth end of the retainer is in the same direction as the opening of the outer wheel; when the ball cage swings to the maximum angle, the end of the small-mouth end of the retainer wraps around the PCD center of the inner wheel.

[0006] Furthermore, when the cage swings to the maximum angle, the distance between the small end of the retainer and the center of the PCD of the inner wheel is n, and the range of the distance n is 0.4 mm to 0.8 mm.

[0007] Furthermore, the length a of the small end is 2 mm ± 0.2 mm greater than the length b of the large end.

[0008] Furthermore, both end edges of the window are symmetrical double arc structures.

[0009] Furthermore, the pressure angle β of the double arc structure is 15° to 25°.

[0010] Furthermore, when the steel ball slides to the double arc structure of the window, there are two contact points between the edge of the window and the steel ball, and the two contact points are symmetrically distributed with the center line of the window as the axis.

[0011] The beneficial effects of the present invention are as follows: compared with the prior art, the high-strength inverted universal joint cage provided by the present invention has the following advantages:

[0012] 1) The small end of the cage is lengthened and the cage is designed to be asymmetric. Ensure that the edge of the cage exceeds the center of the inner wheel PCD by 0.4mm to 0.8mm when the cage swings, and when the cage is assembled with the outer wheel, inner wheel, and steel ball, the large end of the cage is in the same direction as the outer wheel mouth (inverted). This disperses the force at the weak part of the cage, enhances the strength of the cage, and extends the service life of the cage.

[0013] 2) The two end edges of the window in the retainer are designed as a symmetrical double-arc structure; when the steel ball slides to the double-arc structure of the window, there are two points of contact between the edge of the window and the steel ball, avoiding stress concentration at the edge of the window caused by single-point contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the cross-sectional structure of the retaining frame in the embodiment.

[0015] Figure 2 for Figure 1 Schematic diagram of the local structure of area C.

[0016] Figure 3 This is a schematic diagram of the local structure of the embodiment when the cage is assembled and the ball cage is swung to the maximum angle.

[0017] Figure 4 for Figure 3 Schematic diagram of the local structure of area B.

[0018] Figure 5 Schematic diagram of the cross-sectional structure of the cage in the comparative example.

[0019] Figure 6 This is a schematic diagram of the local structure when the ball cage swings to the maximum angle after the cage is assembled in the comparative example.

[0020] Among them, 1-small end; 2-window; 3-large end; 4-center line; 5-cage body; 6-contact point; 7-steel ball; 8-outer wheel; 9-inner wheel; 10-PCD center. DETAILED DESCRIPTION

[0021] The present invention will be further described below by way of specific examples, which are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

[0022] Example

[0023] like Figure 1 As shown, a high-strength flip-mount universal joint cage includes a cage body 5, which is provided with a plurality of windows 2 for the sliding of steel balls 7; the cage body 5 is a non-center-symmetrical structure with the center line 4 of the window 2 as the axis; one end of the cage body 5 is a large end 3, and the other end is a small end 1; the length a of the small end 1 is greater than the length b of the large end 3; the length a of the small end 1 is 2mm±0.2mm greater than the length b of the large end 3. Figure 3 and 4 As shown, when the retainer is assembled with the outer wheel 8, inner wheel 9, and steel ball 7, the retainer's large end 3 faces the same direction as the outer wheel 8's opening; the retainer's small end 1 faces inward from the outer wheel. Due to its length, when the cage swings to its maximum angle, the retainer's small end 1 can wrap around the PCD center 10 of the inner wheel 9. The distance n that the retainer's small end 1 extends beyond the PCD center 10 of the inner wheel 9 is 0.4mm to 0.8mm. The retainer's asymmetric design and inverted assembly disperse the stress at the retainer's weak point, significantly reducing the probability of retainer breakage.

[0024] like Figure 2 As shown, in the retainer, the edges of each window 2 at both ends are symmetrical double-arc structures. The pressure angle β of each double-arc structure ranges from 15° to 25°. When the steel ball 7 slides into the double-arc structure of the window 2, two contact points 6 are created between the edge of the window 2 and the steel ball 7, reducing stress concentration at the edge of the window 2. The two contact points 6 are symmetrically distributed about the centerline 4 of the window 2.

[0025] Comparative Example

[0026] like Figure 5 As shown, compared with the embodiment, the retainer in the comparative example adopts a centrally symmetrical structure, and the lengths of the small end and the large end are the same. Figure 6As shown in the figure, when the cage is assembled with the outer wheel, inner wheel, and steel ball, the small end of the cage is aligned with the outer wheel opening (not inverted). When the cage is swung to its maximum angle, the large end of the cage cannot wrap around the center of the PCD of the inner wheel. During use, the cage is subjected to concentrated stress at the weak point of the cage mouth, making the cage prone to breakage.

[0027] Compared with the embodiment, Figure 5 As shown, the edge of the window on the cage in the comparative example still adopts a single arc single-point contact method; when the steel ball slides to the edge of the window, there is only one contact point between the edge of the window and the steel ball. The stress at the edge of the window is relatively concentrated, the cage is subjected to large force, and it is easy to break.

[0028] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A high-strength flip-mount universal joint cage, comprising a cage body, wherein the cage body is provided with a plurality of windows for sliding of steel balls; characterized in that: With the center line of the window as the axis, the retainer body is a non-center symmetrical structure; one end of the retainer body is a large-mouth end, and the other end is a small-mouth end; the length a of the small-mouth end is greater than the length b of the large-mouth end; when the retainer is assembled with the outer wheel, inner wheel, and steel ball, the large-mouth end of the retainer is oriented in the same direction as the opening of the outer wheel; when the ball cage is swung to the maximum angle, the end of the small-mouth end of the retainer wraps around the PCD center of the inner wheel.

2. A high-strength flip-mount universal joint retainer according to claim 1, characterized in that: When the ball cage swings to the maximum angle, the distance between the small end of the retainer and the center of the PCD of the inner wheel is n, and the range of the distance n is 0.4mm to 0.8mm.

3. The high-strength flip-mount universal joint retainer according to claim 1, characterized in that: The length a of the small end is 2 mm ± 0.2 mm greater than the length b of the large end.

4. The high-strength flip-down universal joint retainer according to claim 1, characterized in that: The edges at both ends of the window are symmetrical double arc structures.

5. The high-strength flip-mount universal joint retainer according to claim 4, characterized in that: The pressure angle β of the double arc structure is 15° to 25°.

6. The high-strength flip-mount universal joint retainer according to claim 4, characterized in that: When the steel ball slides to the double arc structure of the window, there are two contact points between the edge of the window and the steel ball, and the two contact points are symmetrically distributed with the center line of the window as the axis.

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