CN118110738A - A tripod constant velocity universal joint capable of axial sliding - Google Patents

Abstract

The invention discloses an axially slidable tripod constant velocity universal joint, comprising a sleeve, a bearing frame composed of a base and three pins integrally formed with the base, an outer ring and an inner ring; the outer cylindrical surface of the outer ring is in clearance with the sleeve raceway, the outer cylindrical surface of the inner ring is in clearance with the inner cylindrical surface of the outer ring, the inner cylindrical surface of the inner ring is in clearance with the partial outer spherical surface of the pin of the bearing frame or the outer arc surface offset relative to the center line of the pin; an annular groove for accommodating grease is provided on the outer cylindrical surface of the inner ring. Compared with ordinary universal joints, the invention significantly reduces the axial derived force, reduces the manufacturing cost and assembly cost, has a small outer envelope diameter and light weight compared with high-end universal joints, and reduces the manufacturing cost and assembly cost.

Description

A tripod constant velocity universal joint capable of axial sliding

Technical Field

The invention belongs to the field of automobile parts manufacturing and relates to a tripod constant velocity universal joint.

Background technique

The existing ordinary tripod constant velocity universal joint is mainly composed of bearing frame, needle roller, outer ring, retaining ring and spring retaining ring. During the use of the drive shaft, the outer ring rolls around the axis of the pin shaft and slides along the axis of the pin shaft relative to the needle roller. At the same time, due to the existence of the universal joint angle, the outer ring needs to swing relative to the sleeve raceway and slide longitudinally along the sleeve raceway. The superposition of the two movements increases the friction force, especially the axial derived force. The larger the universal joint angle, the greater the axial derived force, and the increase is obvious.

The existing high-end tripod constant velocity universal joints have existing design types, typically including GKN's AAR joints, Nexteer's TG joints, NTN's PTJ, SFJ, etc. The bearing frame can swing relative to the inner ring, the outer ring can roll, slide and slightly swing relative to the sleeve raceway, the inner ring of the TG joint can slide along the pin shaft direction relative to the needle roller, the bearing frame pin shaft of the AAR joint can slide along the pin shaft axis toward the center of the bearing frame relative to the inner ring, and the needle roller can roll and slightly slide relative to the inner and outer rings. Therefore, the axial derived forces of these types of universal joints are relatively small, but because they include the inner ring, outer ring and needle roller, the outer envelope diameter of the sleeve is larger, the weight is relatively larger, the manufacturing cost is high, and when used in high-end vehicles, the vehicle is heavy and expensive, and it is not conducive to the fuel economy of the vehicle, which does not conform to the development trend of lightweight vehicles.

Summary of the invention

The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide an axially slidable tripod constant velocity universal joint, which has significantly reduced axial derived force compared to ordinary universal joints and reduced manufacturing and assembly costs. Compared to high-end universal joints, the outer envelope diameter is small and the weight is light, which reduces manufacturing and assembly costs.

To achieve the above-mentioned purpose, the technical solution of the present invention is: an axially slidable tripod constant velocity universal joint, comprising a sleeve, a bearing frame consisting of a base and three pins integrally formed with the base, an outer ring and an inner ring; the outer cylindrical surface of the outer ring is clearance-matched with the raceway of the sleeve, the outer cylindrical surface of the inner ring is clearance-matched with the inner cylindrical surface of the outer ring, and the inner cylindrical surface of the inner ring is clearance-matched with the partial outer spherical surface of the pin of the bearing frame or the outer arc surface offset relative to the center line of the pin; an annular groove for accommodating grease is provided on the outer cylindrical surface of the inner ring.

Further preferably, the cross section of the connection between the pin shaft of the bearing frame and the base is an ellipse, so that when the bearing frame rotates at a large angle, it will not interfere with the inner ring.

Further preferably, the inner cylindrical surface of the inner ring has protrusions I at both ends. The protrusions at the outer end prevent the inner ring and the outer ring from coming off the bearing frame pin, and the protrusions at the inner end prevent the inner ring and the outer ring from being too close to the center of the universal joint, which would cause difficulty in assembling the tripod bearing into the sleeve raceway.

Further preferably, a protrusion II is provided at one end of the inner cylindrical surface of the outer ring close to the center of the universal joint to control the working position of the inner ring.

Further preferably, the raceway of the sleeve is provided with a tail arc at the place where the sleeve raceway and the outer ring match and near the center of the universal joint to control the radial position of the outer ring and ensure that the outer ring has a slight radial sliding, which is used to further control the axial derived force. A protrusion III is provided in the middle of the inner wall of the sleeve at the clearance match with the pin shaft of the bearing frame, which is used to control the inclination of the inner ring and the outer ring during movement, and prevent the inner ring and the outer ring from excessively tilting, causing the axial derived force to increase, and causing the vehicle to shake.

The beneficial effects of the present invention are as follows: compared with ordinary tripod constant velocity universal joints, the present invention saves needle rollers, retaining rings and spring retaining rings, adds an inner ring, and its outer envelope diameter and weight are slightly smaller, but saves materials, is much simpler than assembling needle rollers, and greatly reduces manufacturing costs and assembly costs; at the same time, because the pin shaft of the bearing frame can rotate, slide, and swing relative to the inner ring, the axial derivative force is reduced; it is used to replace the existing ordinary tripod constant velocity universal joint, which will greatly improve the NVH performance of the vehicle. Compared with high-end tripod constant velocity universal joints, the present invention slightly increases the axial derivative force, but reduces the weight of the universal joint and the maximum envelope diameter of the sliding sleeve, does not require the assembly of needle rollers, saves materials, and is simple to assemble, greatly reducing manufacturing costs and assembly costs; it is more suitable for replacing situations where the axial derivative force is not particularly sensitive, but the use of ordinary tripod universal joints will cause unacceptable vehicle shaking problems.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall assembly cross-sectional structure of the present invention;

FIG2 is a schematic diagram of the cross-sectional structure of a tripod bearing in the present invention;

FIG3 is a front view of the outer ring of the present invention;

FIG4 is a front view of the inner ring of the present invention;

FIG5 is an enlarged schematic diagram of portion A of FIG4 ;

Figure 6 is an enlarged schematic diagram of portion B of Figure 4;

FIG7 is a front view of the bearing frame of the present invention;

FIG8 is a CC cross-sectional view of FIG7;

FIG9 is a schematic structural diagram of a partial outer spherical surface of a pin of a bearing frame in the present invention;

FIG. 10 is a schematic structural diagram of the outer arc surface of the pin of the bearing frame in the present invention that is offset relative to the center line of the pin.

In the figure, 1 is a sleeve, 2 is an outer ring, 3 is an inner ring, 4 is a bearing frame, 5 is a pin of the bearing frame, 11 is a protrusion III, 12 is a finishing arc, 21 is a protrusion II, 31 is an annular groove, 32 is a protrusion I, 41 is the connection between the pin of the bearing frame and the base, 51 is the center line of the pin, 52 is a partial outer spherical surface of the pin, 53 is an outer arc surface I, and 54 is an outer arc surface II.

Detailed ways

The present invention is further described below in conjunction with specific embodiments.

As shown in Figures 1 to 10, this embodiment includes a sleeve 1, a bearing frame 4 composed of a base and three pins 5 integrally formed with the base, an outer ring 2 and an inner ring 3. The outer cylindrical surface of the outer ring 2 is clearance-matched with the raceway of the sleeve 1, and the outer cylindrical surface of the inner ring 3 is clearance-matched with the inner cylindrical surface of the outer ring 2. As shown in Figure 9, the inner cylindrical surface of the inner ring 3 and the local outer spherical surface 52 of the pin 5 of the bearing frame 4 are clearance-fitted, the diameter of the local outer spherical surface 52 is фd, and 51 is the center line of the pin; or as shown in Figure 10, the inner cylindrical surface of the inner ring 3 and the outer arc surface Ⅰ53 and the outer arc surface Ⅱ54 of the pin 5 of the bearing frame 4 are clearance-fitted relative to the center line 51 of the pin, the outer arc surface Ⅰ53 and the outer arc surface Ⅱ54 are two opposite surfaces, and the center of the outer arc surface Ⅰ53 is at the left end of the center line 51 of the pin, and the radius is RA, and the center of the outer arc surface Ⅰ54 is at the right end of the center line 51 of the pin, and the radius is RA, that is, the center of the circle where the outer arc surface Ⅰ53 is located and the center of the circle where the outer arc surface Ⅱ54 is located are offset from the center line 51 of the pin. An annular groove 31 for accommodating grease is provided on the outer cylindrical surface of the inner ring 3 to provide initial lubrication. Since there is a gap between the outer ring 2 and the inner ring 3, when the universal joint continues to work, the same type of external grease can enter the outer cylindrical surface of the outer ring and the inner cylindrical surface of the inner ring to provide further lubrication to ensure the friction control during rotation here. Preferably, the cross section of the connection between the pin shaft 5 of the bearing frame and the base 41 is elliptical, so that the bearing frame 4 will not interfere with the inner ring 3 when the rotation angle is relatively large. Preferably, the two ends of the inner cylindrical surface of the inner ring 3 are respectively provided with protrusions I 32; the protrusion 32 at the outer end is to prevent the inner ring 3 and the outer ring 2 from coming off the bearing frame pin shaft 5, and the protrusion 32 at the inner end prevents the inner ring 3 and the outer ring 2 from being too close to the center of the universal joint, causing difficulties in assembling the tripod bearing into the sliding sleeve raceway. Preferably, a protrusion II 21 is provided at one end of the inner cylindrical surface of the outer ring 2 close to the center of the universal joint to control the working position of the inner ring 3. Preferably, the raceway of the sleeve 1 is provided with a tail arc 12 at the position where the sleeve raceway and the outer ring 2 match and near the center of the universal joint to control the radial position of the outer ring 2 and ensure that the outer ring 2 has a slight radial sliding, which is used to further control the axial derived force. A protrusion III 11 is provided in the middle of the inner wall of the sleeve 1 at the clearance fit with the pin 5 of the bearing frame, which is used to control the inclination of the inner ring 3 and the outer ring 2 during movement, and prevent the inner ring 3 and the outer ring 2 from excessively tilting, causing an increase in the axial derived force and causing the vehicle to shake.

The above-described embodiments are only preferred and exemplary and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An axially slidable tripod constant velocity joint, characterized in that: the bearing comprises a sliding sleeve (1), a bearing bracket (4) consisting of a base body and three pin shafts (5) integrally formed with the base body, an outer ring (2) and an inner ring (3); the outer cylindrical surface of the outer ring (2) is in clearance fit with the raceway of the sliding sleeve (1), the outer cylindrical surface of the inner ring (3) is in clearance fit with the inner cylindrical surface of the outer ring (2), and the inner cylindrical surface of the inner ring (3) is in clearance fit with the local outer spherical surface of the pin shaft (5) of the bearing bracket (4) or the outer arc surface offset relative to the central line of the pin shaft; an annular groove (31) for containing lubricating grease is formed in the outer cylindrical surface of the inner ring (3).

2. The axially slidable tripod constant velocity joint as set forth in claim 1, wherein: the raceway of the sliding sleeve (1) is provided with a ending circular arc (12) at the matching position of the raceway of the sliding sleeve and the outer ring (2) and near the central part of the universal joint; the middle part of the inner wall of the sliding sleeve (1) at the clearance fit position of the pin shaft (5) of the bearing frame is provided with a protrusion III (11).

3. The axially slidable tripod constant velocity joint according to claim 1 or 2, wherein: the two ends of the inner cylindrical surface of the inner ring (3) are respectively provided with a protrusion I (32).

4. An axially slidable tripod constant velocity joint according to claim 3, wherein: and a protrusion II (21) is arranged at one end, close to the center of the universal joint, of the inner column surface of the outer ring (2).

5. The axially slidable tripod constant velocity joint as set forth in claim 4, wherein: the cross section of the joint (41) between the pin shaft (5) and the base body of the bearing frame is elliptical.

6. The axially slidable tripod constant velocity joint according to claim 1 or 2, wherein: and a protrusion II (21) is arranged at one end, close to the center of the universal joint, of the inner column surface of the outer ring (2).

7. The axially slidable tripod constant velocity joint as set forth in claim 6, wherein: the cross section of the joint (41) between the pin shaft (5) and the base body of the bearing frame is elliptical.

8. The axially slidable tripod constant velocity joint according to claim 1 or 2, wherein: the cross section of the joint (41) between the pin shaft (5) and the base body of the bearing frame is elliptical.

9. An axially slidable tripod constant velocity joint according to claim 3, wherein: the cross section of the joint (41) between the pin shaft (5) and the base body of the bearing frame is elliptical.