Small passenger car universal joint three-pin shaft

Abstract

The utility model discloses a kind of small passenger car universal transmission joint three-pin shaft, including three-pin frame and the pin shaft being set on the outer wall of three-pin frame, the shaft neck position of three-pin frame corresponding pin shaft is provided with multi-stage boss, the end of pin shaft is provided with blind hole, bearing ring is installed to the outside of pin shaft;The surface of each group pin shaft and the inner wall of bearing ring are respectively provided with central raceway and two side edge raceways along circumference direction.The utility model is set up multi-stage boss, reduces stress concentration, improves connection structure strength, increases fatigue life;Blind hole can be set, and weight can be reduced, so as to reduce abrasion;Bearing ring adopts integrated bearing design, structure is simpler, the number of parts composition is less, improve reliability, and reduce cost;The design of net pattern lubricating oil flow channel is favorable to lubricating oil flow, realizes self-lubricating effect, improves lubricating effect by, further reduce abrasion to improve life;Overall reliability can be improved.

Description

Technical Field

[0001] This utility model relates to the field of constant velocity universal joint technology, specifically a three-pin universal joint for small passenger vehicles. Background Technology

[0002] A constant velocity universal joint is a type of universal joint in which the output shaft and input shaft rotate at the same speed in all positions within the working range. It is an important component of the steering system of small cars. Among them, the three-pin universal joint is a quasi-constant velocity universal joint evolved from the double universal joint, and the three pins are the core of the three-pin universal joint.

[0003] The biggest concern during the use of universal joints is the failure of the three pins. Once the three pins are damaged, the entire universal joint system will be paralyzed. Therefore, in order to meet market demand, it is necessary to design a more reliable three-pin universal joint for small passenger vehicles. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a three-pin universal joint for small passenger vehicles, which aims to improve reliability based on existing three-pin technology.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A three-pin shaft for a universal joint of a small passenger vehicle includes a three-pin frame, a spline groove provided on the inner wall of the center hole of the three-pin frame, and a pin shaft provided on the outer wall of the three-pin frame. The three-pin frame is provided with a multi-stage boss at the journal position corresponding to the pin shaft. The end of the pin shaft is provided with a blind hole. A bearing ring is sleeved on the outside of the pin shaft.

[0007] Each set of pins has a central raceway and two side raceways arranged circumferentially on its surface and the inner wall of the bearing ring. The central raceway is located between the two side raceways. Needle rollers and balls are installed in the central raceway and the side raceways, respectively. The pin surface is also provided with a textured lubricating oil flow channel that communicates with the central raceway and the side raceways on the pin.

[0008] Preferably, the blind hole is a tapered hole and is located at the center of the end of the pin. The depth of the blind hole does not exceed half the length of the pin and the diameter of the opening does not exceed the radius of the end of the pin.

[0009] Preferably, the multi-stage boss, the pin, and the three-pin bracket are integrated into one structure, and the multi-stage boss and the pin are coaxially arranged.

[0010] Preferably, the pin is provided with a groove, and a retaining ring located on the outside of the bearing ring is engaged in the groove.

[0011] Preferably, the needle roller is located in the middle of the bearing ring, the balls are symmetrically arranged with respect to the needle roller, and the diameters of the balls and the needle roller are equal.

[0012] Preferably, the depth of the textured lubricating oil channel does not exceed 0.5 mm, the intersection angle of the textured lubricating oil channel is 90°, and the angle between the textured direction of the textured lubricating oil channel and the axis of the pin is 45°.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention reduces stress concentration, improves the strength of the connection structure, and increases fatigue life by setting multi-stage bosses; it reduces weight and thus wear by setting blind holes; the bearing ring adopts an integrated bearing design, which simplifies the structure, reduces the number of parts, improves reliability, and reduces costs; the design of the textured lubricating oil flow channel facilitates lubricating oil flow and achieves a self-lubricating effect, further reducing wear and increasing life by improving lubrication; in summary, it can improve overall reliability. Attached Figure Description

[0015] Figure 1 This is a front view of the present utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is a partial front view of the pin shaft of this utility model;

[0018] Figure 4 This is a partial orthogonal sectional view of the pin shaft of this utility model.

[0019] In the diagram: 1. Three-pin bracket; 2. Spline groove; 3. Pin shaft; 4. Multi-stage boss; 5. Blind hole; 6. Bearing ring; 7. Central raceway; 8. Side raceway; 9. Needle roller; 10. Ball bearing; 11. Corrugated lubricating oil flow channel; 12. Snap groove; 13. Snap ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1-4As shown, this utility model provides a technical solution: a three-pin shaft for a universal joint of a small passenger vehicle, including a three-pin frame 1, a spline groove 2 set on the inner wall of the central hole of the three-pin frame 1, and a pin 3 set on the outer wall of the three-pin frame 1. The three-pin frame 1 is provided with a multi-stage boss 4 at the journal position corresponding to the pin 3. The multi-stage boss 4, the pin 3, and the three-pin frame 1 are an integral structure, and the multi-stage boss 4 and the pin 3 are coaxially arranged. The journal position is a stress concentration area. The multi-stage boss 4 can improve the structural strength of the stress concentration area.

[0022] A blind hole 5 is provided at the end of the pin 3. The blind hole 5 is a tapered hole and is located in the center of the end of the pin 3. The depth of the blind hole 5 does not exceed half the length of the pin 3 and the diameter of the opening does not exceed the length of the radius of the end of the pin 3. The end of the pin 3 is subjected to less force. The blind hole 5 can achieve the purpose of lightweighting while ensuring structural strength.

[0023] A bearing ring 6 is sleeved on the outside of the pin 3. The bearing adopts an integrated design of bearing ring 6 and pin 3, which can simplify the structure and reduce the number of structures, reduce costs and failure rate. A slot 12 is provided on the pin 3, and a retaining ring 13 located on the outside of the bearing ring 6 is snapped into the slot 12.

[0024] Each set of pins 3 and the inner wall of the bearing ring 6 are respectively provided with a central raceway 7 and two side raceways 8 along the circumference. The central raceway 7 is located between the two side raceways 8. The central raceway 7 and the side raceways 8 are respectively installed with needle rollers 9 and balls 10. The needle rollers 9 are located in the middle of the bearing ring 6, and the balls 10 are symmetrically arranged with the needle rollers 9 as the center, and the diameters of the balls 10 and the needle rollers 9 are equal.

[0025] The surface of the pin 3 is also provided with a textured lubricating oil channel 11 that is connected to the central raceway 7 and the side raceway 8 on the pin 3. The depth of the textured lubricating oil channel 11 does not exceed 0.5 mm, the inner angle of the intersection of the textured lubricating oil channel 11 is 90°, and the angle between the textured direction of the textured lubricating oil channel 11 and the axis of the pin 3 is 45°, so as to achieve a self-lubricating effect, reduce wear, and extend service life.

[0026] Working principle:

[0027] By setting a multi-stage boss 4 at the journal where the pin 3 connects to the three-pin bracket 1, the connection size is increased. This optimizes stress distribution at stress concentration points, reduces stress concentration, improves the strength of the connection structure, and increases fatigue life. By setting a blind hole at the end of the pin 3 where the force is less, weight can be reduced, thereby reducing wear. The bearing ring 6 uses the central raceway 7 and side raceways 8 on the inner wall and the outer wall of the pin 3 to install needle rollers 9 and balls 10. This integrated bearing design simplifies the structure, reduces the number of parts, improves reliability, and reduces costs. The design of the textured lubricating oil flow channel 11 facilitates the flow of lubricating oil when the bearing ring 6, needle rollers 9, and balls 10 rotate, achieving a self-lubricating effect. By improving lubrication, wear is further reduced, thus increasing lifespan. In summary, this improves overall reliability.

[0028] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-pin shaft for a universal joint in a small passenger vehicle, comprising a three-pin holder (1), a spline groove (2) disposed on the inner wall of the center hole of the three-pin holder (1), and a pin (3) disposed on the outer wall of the three-pin holder (1), characterized in that: The three pin brackets (1) are provided with multi-stage bosses (4) at the journal position of the pin shaft (3), the end of the pin shaft (3) is provided with blind holes (5), and a bearing ring (6) is sleeved on the outside of the pin shaft (3). Each set of pins (3) and the inner wall of the bearing ring (6) are respectively provided with a central raceway (7) and two side raceways (8) along the circumference. The central raceway (7) is located between the two side raceways (8). The central raceway (7) and the side raceways (8) are respectively equipped with needle rollers (9) and balls (10). The surface of the pin (3) is also provided with a textured lubricating oil flow channel (11) that communicates with the central raceway (7) and the side raceways (8) on the pin (3).

2. The three-pin universal joint for a small passenger vehicle according to claim 1, characterized in that: The blind hole (5) is a tapered hole and is located at the center of the end of the pin (3). The depth of the blind hole (5) does not exceed half the length of the pin (3) and the diameter of the opening does not exceed the length of the radius of the end of the pin (3).

3. The three-pin universal joint for a small passenger vehicle according to claim 1, characterized in that: The multi-stage boss (4), the pin (3), and the three-pin bracket (1) are an integral structure, and the multi-stage boss (4) and the pin (3) are coaxially arranged.

4. The three-pin universal joint for a small passenger vehicle according to claim 1, characterized in that: The pin (3) is provided with a groove (12), and a retaining ring (13) located outside the bearing ring (6) is snapped into the groove (12).

5. The three-pin universal joint for a small passenger vehicle according to claim 1, characterized in that: The needle roller (9) is located in the middle of the bearing ring (6), and the balls (10) are symmetrically arranged with the needle roller (9) as the center, and the diameters of the balls (10) and the needle roller (9) are equal.

6. The three-pin universal joint for a small passenger vehicle according to claim 1, characterized in that: The depth of the textured lubricating oil channel (11) does not exceed 0.5 mm, the intersection angle of the textured lubricating oil channel (11) is 90°, and the skew angle between the textured direction of the textured lubricating oil channel (11) and the axis of the pin (3) is 45°.

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