CN118110738A - Tripod constant velocity universal joint capable of axially sliding - Google Patents
Tripod constant velocity universal joint capable of axially sliding Download PDFInfo
- Publication number
- CN118110738A CN118110738A CN202311725082.1A CN202311725082A CN118110738A CN 118110738 A CN118110738 A CN 118110738A CN 202311725082 A CN202311725082 A CN 202311725082A CN 118110738 A CN118110738 A CN 118110738A
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- Prior art keywords
- cylindrical surface
- constant velocity
- pin shaft
- ring
- inner ring
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- 239000004519 grease Substances 0.000 claims abstract description 5
- 230000001050 lubricating effect Effects 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Rolling Contact Bearings (AREA)
Abstract
The invention discloses an axially slidable tripod constant velocity universal joint, which comprises a sliding sleeve, a bearing frame, an outer ring and an inner ring, wherein the bearing frame consists of a base body and three pin shafts integrally formed with the base body; the outer cylindrical surface of the outer ring is in clearance fit with the raceway of the sliding sleeve, the outer cylindrical surface of the inner ring is in clearance fit with the inner cylindrical surface of the outer ring, and the inner cylindrical surface of the inner ring is in clearance fit with the local outer spherical surface of the pin shaft of the bearing frame or the outer arc surface offset relative to the central line of the pin shaft; an annular groove for containing lubricating grease is formed in the outer cylindrical surface of the inner ring. Compared with the common universal joint, the invention has the advantages of obviously reduced axial derivative force, reduced manufacturing cost and assembly cost, small outer wrapping diameter of the high-end universal joint, light weight and reduced manufacturing cost and assembly cost.
Description
Technical Field
The invention belongs to the field of automobile part manufacturing, and relates to a tripod constant velocity universal joint.
Background
The existing common tripod constant velocity universal joint mainly comprises bearing frames, rolling pins, outer rings, baffle rings and spring snap rings, wherein the outer rings roll around the axis direction of a pin shaft and slide along the axis direction of the pin shaft relative to the rolling pins in the use process of a driving shaft, meanwhile, due to the existence of a universal joint corner, the outer rings need to swing relative to a sliding sleeve raceway and longitudinally slide along the sliding sleeve raceway, and friction force is increased, especially axial derivative force is increased, and when the angle of the universal joint is larger, the axial derivative force is larger, and the lifting is obvious.
The existing high-end type tripod constant velocity universal joint is of the design type, and typically comprises an AAR joint of GKN, a TG joint of Shite resistance, PTJ of NTN, SFJ and the like, a bearing frame can swing relative to an inner ring, an outer ring can roll, slide and slightly swing relative to a sliding sleeve raceway, an inner ring of the TG joint can slide relative to a needle roller along the direction of a pin shaft, a bearing frame pin shaft of the AAR joint can slide relative to the inner ring along the direction of the pin shaft axis towards the center of the bearing frame, and the needle roller can roll and slightly slide relative to the inner ring and the outer ring. Therefore, the axial derivative forces of the universal joints are smaller, but the axial derivative forces comprise the inner ring, the outer ring and the needle rollers, so that the outer envelope diameter of the sliding sleeve is larger, the weight is relatively larger, the manufacturing cost is high, the universal joint is applied to a high-end vehicle, the weight of the vehicle is heavy, the price is high, the fuel economy of the vehicle is not facilitated, and the development trend of light weight of the vehicle is not met.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide the tripod constant velocity universal joint capable of sliding axially, which has obviously reduced axial derivative force compared with the common universal joint, reduces the manufacturing cost and the assembly cost, has small outer wrapping diameter compared with the high-end universal joint, has light weight and reduces the manufacturing cost and the assembly cost.
In order to achieve the above object, the technical solution of the present invention is: the tripod constant velocity universal joint capable of axially sliding comprises a sliding sleeve, a bearing frame, an outer ring and an inner ring, wherein the bearing frame consists of a base body and three pin shafts which are integrally formed with the base body; the outer cylindrical surface of the outer ring is in clearance fit with the raceway of the sliding sleeve, the outer cylindrical surface of the inner ring is in clearance fit with the inner cylindrical surface of the outer ring, and the inner cylindrical surface of the inner ring is in clearance fit with the local outer spherical surface of the pin shaft of the bearing frame or the outer arc surface offset relative to the central line of the pin shaft; an annular groove for containing lubricating grease is formed in the outer cylindrical surface of the inner ring.
Further preferably, the cross section of the joint of the pin shaft and the base body of the bearing frame is elliptical. So that the bearing bracket can not interfere with the inner ring when the rotation angle of the bearing bracket is larger.
Further preferably, two ends of the inner cylindrical surface of the inner ring are respectively provided with a protrusion I. The protrusions at the outer end prevent the inner ring and the outer ring from falling out of the bearing frame pin shaft, and the protrusions at the inner end prevent the inner ring and the outer ring from being excessively close to the center of the universal joint to cause difficulty in assembling the three-fork bearing into the sliding sleeve raceway.
Further preferably, a protrusion II is arranged at one end of the inner cylindrical surface of the outer ring, which is close to the center of the universal joint, so as to control the working position of the inner ring.
Further preferably, the raceway of the sliding sleeve is provided with a ending circular arc at the matching position of the raceway of the sliding sleeve and the outer ring and close to the central part of the universal joint, so as to control the radial position of the outer ring, ensure that the outer ring has tiny sliding in the radial direction, and further control the axial derivative force. The middle part of the inner wall of the sliding sleeve at the clearance fit position of the pin shaft of the bearing frame is provided with a protrusion III for controlling the inclination of the inner ring and the outer ring during movement, and preventing the excessive inclination of the inner ring and the outer ring from causing the increase of axial derivative force and enabling the vehicle to shake.
The beneficial effects of the invention are as follows: compared with the common tripod constant velocity universal joint, the invention omits the needle roller, the baffle ring and the spring snap ring, increases the inner ring, has slightly smaller outer envelope diameter and weight, saves materials, is much simpler than the needle roller assembly, and greatly reduces the manufacturing cost and the assembly cost; meanwhile, the pin shaft of the bearing frame can rotate, slide and swing relative to the inner ring, so that the axial derivative force is reduced; the three-ball pin type constant velocity universal joint is used for replacing the existing common three-ball pin type constant velocity universal joint, and the NVH performance of a vehicle can be greatly improved. Compared with the high-end tripod constant velocity universal joint, the axial derivative force is slightly increased, but the weight of the universal joint and the maximum envelope diameter of the sliding sleeve are reduced, the rolling pin is not assembled, the material is saved, the assembly is simple, and the manufacturing cost and the assembly cost are greatly reduced; the three-ball-and-socket universal joint is more suitable for replacing the situation that the axial derivative force is not particularly sensitive, but the common three-ball-and-socket universal joint is used for solving the problem of unacceptable vehicle shake.
Drawings
FIG. 1 is a schematic view of the overall assembled cross-sectional structure of the present invention;
FIG. 2 is a schematic cross-sectional view of a three-fork bearing according to the present invention;
FIG. 3 is a front view of the outer race of the present invention;
FIG. 4 is a front view of the inner race of the present invention;
FIG. 5 is an enlarged schematic view of portion A of FIG. 4;
FIG. 6 is an enlarged schematic view of portion B of FIG. 4;
FIG. 7 is a front view of a bearing housing of the present invention;
FIG. 8 is a sectional view of the CC of FIG. 7;
FIG. 9 is a schematic view of the structure of the partial outer sphere of the pin shaft of the bearing bracket according to the present invention;
fig. 10 is a schematic structural view of an outer arc surface of a bearing bracket pin offset relative to a pin axis.
In the figure, 1 is a sliding sleeve, 2 is an outer ring, 3 is an inner ring, 4 is a bearing bracket, 5 is a pin shaft of the bearing bracket, 11 is a protrusion III, 12 is a ending circular arc, 21 is a protrusion II, 31 is an annular groove, 32 is a protrusion I, 41 is a joint of the pin shaft of the bearing bracket and a base body, 51 is a pin shaft center line, 52 is a pin shaft local outer spherical surface, 53 is an outer circular arc surface I, and 54 is an outer circular arc surface II.
Detailed Description
The invention is further described below in connection with specific embodiments.
As shown in fig. 1 to 10, the present embodiment includes a sliding sleeve 1, a bearing bracket 4 composed 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, and the outer cylindrical surface of the inner ring 3 is in clearance fit with the inner cylindrical surface of the outer ring 2. As shown in fig. 9, the inner cylindrical surface of the inner ring 3 is in clearance fit with a local outer spherical surface 52 of a pin shaft 5 of the bearing bracket 4, the diameter of the local outer spherical surface 52 is phi d, and 51 is the pin shaft center line; or as shown in fig. 10, the inner cylindrical surface of the inner ring 3 is in clearance fit with an outer arc surface I53 and an outer arc surface II 54 of the pin 5 of the bearing frame 4, which are offset relative to the pin center line 51, the outer arc surface I53 and the outer arc surface II 54 are opposite, the circle center of the outer arc surface I53 is at the left end of the pin center line 51, the radius is RA, the circle center of the outer arc surface I54 is at the right end of the pin center line 51, and the radius is RA, namely, the center of the circle where the outer arc surface I53 is located and the center of the circle where the outer arc surface II 54 is located are offset by the pin center line 51. An annular groove 31 for containing lubricating grease is formed in the outer cylindrical surface of the inner ring 3 to provide initial lubrication, and because of a gap between the outer ring 2 and the inner ring 3, when the universal joint continuously works, external lubricating grease of the same type can enter the outer cylindrical surface of the outer ring and the inner cylindrical surface of the inner ring to provide further lubrication so as to ensure friction force control during rotation. Preferably, the cross section of the connection 41 between the pin 5 and the base body is elliptical so that the bearing frame 4 does not interfere with the inner ring 3 when the rotation angle of the bearing frame is relatively large. Preferably, two ends of the inner cylindrical surface of the inner ring 3 are respectively provided with a protrusion I32; the protrusions 32 at the outer end prevent the inner ring 3 and the outer ring 2 from being separated from the bearing frame pin 5, and the protrusions 32 at the inner end prevent the inner ring 3 and the outer ring 2 from being excessively close to the center of the universal joint to cause difficulty in fitting the three-way bearing into the sliding sleeve raceway. Preferably, a protrusion ii 21 is provided on the end of the inner cylindrical surface of the outer ring 2 near the center of the universal joint, so as to control the working position of the inner ring 3. Preferably, the rolling path of the sliding sleeve 1 is provided with a ending circular arc 12 at the matching position of the rolling path of the sliding sleeve and the outer ring 2 and near the central part of the universal joint, so as to control the radial position of the outer ring 2, ensure that the outer ring 2 has slight sliding in the radial direction and further control the axial derivative force. 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 bracket is provided with a protrusion III 11 for controlling the inclination of the inner ring 3 and the outer ring 2 during movement, and preventing the excessive inclination of the inner ring 3 and the outer ring 2 from causing the increase of axial derivative force and leading the vehicle to shake.
The foregoing embodiments are merely preferred and exemplary and are not intended to limit the present invention, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311725082.1A CN118110738A (en) | 2023-12-15 | 2023-12-15 | Tripod constant velocity universal joint capable of axially sliding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311725082.1A CN118110738A (en) | 2023-12-15 | 2023-12-15 | Tripod constant velocity universal joint capable of axially sliding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118110738A true CN118110738A (en) | 2024-05-31 |
Family
ID=91215008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311725082.1A Pending CN118110738A (en) | 2023-12-15 | 2023-12-15 | Tripod constant velocity universal joint capable of axially sliding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118110738A (en) |
-
2023
- 2023-12-15 CN CN202311725082.1A patent/CN118110738A/en active Pending
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