Needle bearing device for automobile gearbox

Abstract

The utility model discloses a needle bearing device for an automobile gearbox, which belongs to the automobile gearbox and comprises a shaft sleeve and a needle bearing, the shaft sleeve comprises a sleeve and a shaft sleeve retainer ring coaxially arranged at one end of the sleeve, a raceway for sleeving the needle bearing is formed on the periphery of the sleeve, and a grinding undercut is arranged at the joint of the shaft sleeve retainer ring and the raceway. The grinding undercut at the joint of the shaft sleeve check ring and the raceway can facilitate grinding and machining of a grinding wheel, the root arc structure of the grinding undercut can effectively improve stress concentration of the root of the grinding undercut, and the risk of breakage of the shaft sleeve check ring is reduced; the bottom of the opening of the grinding undercut is of a plane structure, the undercut depth can be reduced, oil storage space can be used when the shaft sleeve works, and the lubricating condition of the shaft sleeve in work is effectively improved.

Description

Technical Field

[0001] The utility model relates to an automotive transmission, in particular to a needle roller bearing device for an automotive transmission. Background Art

[0002] Due to the need for synchronization and gear shifting between the transmission shaft and the gear of the automotive transmission, a needle roller bearing and a bushing are installed between the transmission shaft and the gear of the automotive transmission. The bushing of the automotive transmission is a special bushing installed on the transmission shaft of the automotive transmission to meet the fixed installation of the needle roller bearing. Among them, the bushing is used as the inner ring of the needle roller bearing, and the outer circle (raceway) and the snap ring part in contact with the needle rollers of the bearing need to be finely processed to meet the requirements of being used as the inner ring of the bearing. The bushing of the automotive transmission needs to bear the working load of the needle roller bearing during operation, so relatively high requirements are imposed on the load-bearing capacity and lubrication conditions of the bushing. Existing bushings tend to fail and affect their service life due to poor lubrication conditions, low machining accuracy of the snap ring, and poor load-bearing conditions when subjected to axial loads. Content of the Utility Model

[0003] Technical problems to be solved: Aiming at the problems existing in the prior art, the utility model provides a needle roller bearing device for an automotive transmission. The snap ring of the bushing is subjected to profile modification processing, which can effectively improve its lubrication and load-bearing capacity and extend the service life of the needle roller bearing device.

[0004] Technical solution: A needle roller bearing device for an automotive transmission according to the utility model includes a bushing and a needle roller bearing. The bushing includes a sleeve and a bushing snap ring coaxially arranged at one end of the sleeve. A raceway for the needle roller bearing to be sleeved is formed on the outer circumference of the sleeve, and a run-out groove is provided at the junction of the bushing snap ring and the raceway;

[0005] Wherein, the root of the run-out groove is of an arc structure, and its arc radius R1 is 0.7 - 0.9 mm, and a flat surface is provided at the bottom of the run-out groove at the connection of the bushing snap ring and the raceway.

[0006] Preferably, the width L2 of the run-out groove is 1.0 - 2.0 mm, and its depth L3 is 0.1 - 0.5 mm.

[0007] Preferably, the run-out groove is of a V-shaped groove structure, the angle R2 between the V-shaped groove and the outer circle generatrix of the sleeve is 30°, and the opening angle R3 of the V-shaped groove is 35°.

[0008] Preferably, the side surface of the bushing snap ring corresponding to the raceway is an inclined surface with the inner side being higher and the outer side being lower.

[0009] Preferably, the drop L1 between the highest point on the inner side and the lowest point on the outer side of the inclined surface of the snap ring is 0.005 - 0.015 mm.

[0010] Preferably, the needle roller bearing includes a cage adapted to the outer diameter of the bushing. The cage is of an annular structure, and a plurality of limiting grooves are provided at equal intervals along its circumference, and rolling elements rotatably connected in the limiting grooves.

[0011] Preferably, clamping blocks are respectively arranged at both ends of each limiting groove corresponding to the outer circumference of the cage.

[0012] Compared with the prior art, the utility model has at least the following beneficial effects:

[0013] 1. The run-out groove at the junction of the bushing retaining ring and the raceway of the utility model facilitates the grinding process of the grinding wheel. The root arc structure of the run-out groove can effectively improve the stress concentration at the root of the run-out groove and reduce the risk of fracture of the bushing retaining ring; the bottom of the opening of the run-out groove is a flat structure, which can reduce the groove depth and can also serve as an oil storage space during the operation of the bushing, effectively improving the lubrication conditions of the bushing during operation;

[0014] 2. The inclined surfaces corresponding to the bushing retaining ring and the raceway can ensure a certain gap between the end face of the bushing retaining ring and the rolling element assembled on the raceway during the operation of the bushing, which is beneficial to the formation of a lubricating oil film to improve the lubrication conditions of the end face of the rolling element and extend the service life of the bushing and the rolling element. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the main view of the structure of the needle roller bearing device of the utility model;

[0016] Figure 2 is Figure 1 the axial sectional view of the bushing in

[0017] Figure 3 is Figure 1 the three-dimensional structure schematic diagram of the needle roller bearing in

[0018] Reference numerals: 100, needle roller bearing device; 1, bushing; 11, bushing retaining ring; 12, raceway; 13, run-out groove; 2, needle roller bearing; 3, cage; 31, limiting groove; 32, clamping block; 4, rolling element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the utility model clearer, the technical solutions of the embodiments of the utility model will be clearly and completely described below with reference to the attached Figures 1 to 3 The technical solutions of the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the utility model.

[0020] Embodiment 1: As shown in Figures 1 to 2As shown in the figure, a needle roller bearing device for an automotive transmission disclosed by the present utility model, the needle roller bearing device 100 includes a bushing 1 and a needle roller bearing 2. The bushing 1 is correspondingly sleeved on the transmission shaft of the automotive transmission. The bushing 1 includes a sleeve and a bushing retaining ring 11 coaxially arranged at one end of the sleeve. A raceway 12 for sleeving the needle roller bearing 2 is formed on the outer periphery of the sleeve. A run-out groove 13 is provided at the junction of the bushing retaining ring 11 and the raceway 12. The width L2 of the run-out groove 13 is 1.0 - 2.0 mm, and its depth L3 is 0.1 - 0.5 mm; the run-out groove 13 is a V-shaped groove structure, the angle R2 between the V-shaped groove and the outer circle generatrix of the sleeve is 30°, and the opening angle R3 of the V-shaped groove is 35°. The root of the run-out groove 13 is an arc structure, its arc radius R1 is 0.7 - 0.9 mm, and a flat surface is provided at the bottom of the run-out groove 13 at the junction of the bushing retaining ring 11 and the raceway 12. The run-out groove 13 at the junction of the bushing retaining ring 11 and the raceway 12 facilitates the grinding process by a grinding wheel. The arc structure at the root of the run-out groove 13 can effectively improve the stress concentration at the root of the run-out groove and reduce the risk of fracture of the bushing retaining ring; the bottom of the opening of the run-out groove is a flat surface structure, which can reduce the groove depth and can also serve as an oil storage space during the operation of the bushing, effectively improving the lubrication conditions of the bushing operation.

[0021] Embodiment 2: Based on Embodiment 1, the side surface of the bushing retaining ring 11 corresponding to the raceway 12 in this embodiment is an inclined surface with a higher inner side and a lower outer side, and the drop L1 between the highest point on the inner side of the retaining ring inclined surface and the lowest point on the outer side is 0.005 - 0.015 mm. During the operation of the bushing 1, a certain gap can be ensured between the end surface of the bushing retaining ring 11 and the rolling elements 4 assembled on the raceway 12, which is beneficial to the formation of a lubricating oil film to improve the lubrication conditions of the end surface of the rolling elements and increase the service life of the bushing and the rolling elements.

[0022] As Figure 1 and Figure 3 shown in the figure, the needle roller bearing 2 includes a cage 3 adapted to the outer diameter of the bushing. The cage 3 is a ring structure, and a plurality of limiting grooves 31 are equidistantly arranged along its circumference and rolling elements 4 rotatably connected in the limiting grooves 31. Clamping blocks 32 are respectively provided at both ends corresponding to each limiting groove 31 on the outer periphery of the cage 3. The rolling elements 4 can be stably fixed in the limiting grooves 31 through the clamping blocks 32 to ensure the rotational stability of the rolling elements 4.

[0023] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and refinements can also be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A needle roller bearing device for an automotive transmission, characterized in that, It includes a bushing (1) and a needle roller bearing (2). The bushing (1) includes a sleeve and a bushing retaining ring (11) coaxially arranged at one end of the sleeve. A raceway (12) for sleeving the needle roller bearing (2) is formed on the outer circumference of the sleeve. An overrun groove (13) is provided at the junction of the bushing retaining ring (11) and the raceway (12). Among them, the root of the overrun groove (13) is of an arc structure, and its arc radius R1 is 0.7 - 0.9 mm. And a flat surface is provided at the bottom of the overrun groove (13) at the connection of the bushing retaining ring (11) and the raceway (12).

2. The needle roller bearing device for an automotive transmission according to claim 1, characterized in that, The width L2 of the overrun groove (13) is 1.0 - 2.0 mm, and its depth L3 is 0.1 - 0.5 mm.

3. The needle roller bearing device for an automotive transmission according to claim 2, characterized in that, The overrun groove (13) is of a V-shaped groove structure. The angle R2 between the V-shaped groove and the outer circle generatrix of the sleeve is 30°, and the opening angle R3 of the V-shaped groove is 35°.

4. The needle roller bearing device for an automotive transmission according to claim 1, characterized in that, The side surface of the bushing retaining ring (11) corresponding to the raceway (12) is an inclined surface with the inner side being higher and the outer side being lower.

5. The needle roller bearing device for an automotive transmission according to claim 4, characterized in that, The drop L1 between the highest point on the inner side and the lowest point on the outer side of the inclined surface of the retaining ring is 0.005 - 0.015 mm.

6. The needle roller bearing device for an automotive transmission according to any one of claims 1 to 5, characterized in that, The needle roller bearing (2) includes a cage (3) adapted to the outer diameter of the bushing. The cage (3) is of an annular structure, and a plurality of limiting grooves (31) are equidistantly arranged along its circumference, and rolling elements (4) rotatably connected in the limiting grooves (31).

7. The needle roller bearing device for an automotive transmission according to claim 6, characterized in that, Clamping blocks (32) are respectively arranged at both ends of each limiting groove (31) corresponding to the outer circumference of the cage (3).

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