JPH0251615A - thrust roller bearing - Google Patents

Abstract

PURPOSE:To reduce abrasion, seizing, etc., at a contacting surface between an outer circumferential edge part of a holder and a flange part of an outer ring by stopping the flange part of the outer ring at an end part of a pawl of an inner ring without separating them from each other. CONSTITUTION:An inner ring 10 is provided with pawls 12 at three positions equally separating the circumference of the outer circumferential edge of an orbit part 11 consisting of a circular steel plate standing on the side of an orbit surface 11a. Rollers 31 with holders 30 and an outer ring 20 are pushed into the inner ring 10 by resiliency deformation of the pawls 12 at the inner ring 10, then flange parts 23 of the outer ring 20 are stopped by tabs 12a of the pawls 12. A bearing can thus be composed without separation which will not be separated from the inner ring 10 if the outer ring 20, the holders 30 and the rollers 31 move axially in handling the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thrust roller bearing used in automatic transmissions, transaxles, etc. of automobiles.

[Conventional technology]

Conventional thrust roller bearings have an outer ring with a flange on the outer periphery of the annular raceway that bends toward the raceway surface, and a flange that bends toward the raceway on the inner periphery of the annular raceway. Rollers assembled to the cage are disposed between the raceway surfaces of the inner ring and the raceway surface of either the outer ring and the inner ring, or on the raceway surface of either the outer ring and the inner ring, and are provided on the edge of the flange portion of the outer ring. It has a structure in which the rollers with cages are locked in a non-separable manner by tabs that protrude inward in the radial direction and tabs that protrude outward in the radial direction provided on the edge of the flange of the inner ring.

[Problem to be solved by the invention]

This type of thrust roller bearing is often used under severe conditions such as high temperatures or exceeding the allowable rotation speed. When factors such as deceleration and load fluctuations combine, the centrifugal force of the rollers can cause wear on the cage pockets, as well as
In outer ring guide bearings, wear and seizure occur on the outer circumferential edge of the cage and the inner diameter surface of the outer ring flange (cage guide surface), and in inner ring guide bearings, wear and tear occur on the inner circumferential edge of the cage and the inner diameter surface of the inner ring flange. Abrasion, seizure, etc. often occur on the outer diameter surface (cage guide surface) of the part.

If this kind of wear occurs, the caged rollers will separate from the outer and inner rings or be damaged, and if seizing occurs, they will also be damaged, which will greatly reduce the performance and life of the bearing. There is a problem of influence.

This invention was made with the aim of solving the above problems.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the outer circumferential edge of the raceway part has at least two claws rising toward the raceway surface, and the inner circumferential edge of the retainer an inner ring with a flange portion for guiding the rollers bent toward the raceway side, an outer ring with a flange portion for guiding the outer diameter side of the rollers bent toward the raceway side on the outer periphery of the raceway portion, and an inner ring and an outer ring. and a roller with a cage incorporated between the raceway surfaces, and the flange portion of the outer ring is non-separably locked to the end locking portion of the pawl of the inner ring.
It is said to be the invention of

In addition, in the present invention, a flange portion for guiding the outer diameter side of the roller is formed on the outer circumferential side of the raceway portion, and is bent toward the raceway surface side.
an inner ring having claws that stand up toward the raceway surface at at least two locations on the outer periphery of the flange portion, and a flange portion for guiding the inner periphery of the retainer that is bent toward the raceway surface on the inner periphery of the raceway portion; According to a second aspect of the present invention, there is provided a roller with a cage built into the raceway surface of the inner ring, and the outer circumferential edge of the cage is non-latively locked to the end locking portion of the pawl of the inner ring.

〔Example〕

Fig. 1 is a partially cutaway front view of the embodiment of the first invention, and Fig. 2 (al and mountains) is an enlarged view taken along line A-A and line B-B of Fig. 1, respectively. FIG. In the figure, reference numeral 10 indicates an inner ring, 2° indicates an outer ring, 30 indicates a cage, and 31 indicates a roller.

The inner ring 10 is provided with pawls I2 that stand up toward the raceway surface 1) a side at the locations where the outer circumferential edge of the raceway portion 1) made of an annular steel plate is divided into three equal parts, and the center portion of the tip of the pawl 12 has a radius. The tab 12a protruding inward is caulked. In addition, a flange portion 13 is provided on the inner peripheral edge of the raceway portion 1).
It is bent and molded on the side.

The outer ring 20 has an outer peripheral edge of a raceway portion 21 made of an annular steel plate.
The flange portion 23 is bent toward the raceway surface 21a.

Between the raceway surface 1)a of the inner ring 10 and the raceway surface 21a of the outer ring 20, rollers 31 assembled to a cage 30 are disposed in a movable manner.

In the inner ring IO of the thrust roller bearing configured as described above, the outer diameter surface of the flange portion 13 is a guide surface for the inner peripheral edge of the cage 30, and the outer peripheral edge of the cage 30 is different from the inner diameter surface of the pawls 12 of the inner ring 10. Please avoid contact. - The inner surface of the flange portion 23 of the outer ring 20 serves as a guide surface for the outer diameter side head portion of the roller 31.

When the rollers 31 with retainer 30 and the outer ring 20 are pushed into the inner ring 10 using the elastic deformation of the claws 12 of the inner ring 10, the tabs 12a of the claws 12 push the flange portion 2 of the outer ring 20.
3 is in a locked state, and even if the outer ring 20, retainer 30, and rollers 31 move in the axial direction during handling of the bearing, the inner ring 1
It is configured as a non-separable bearing that does not separate from the bearing.

The claws 12 of the inner ring 10 may be provided at two locations at approximately equal intervals in the circumferential direction, and the entire tip of the claws 12 may be bent inward in the radial direction, and the bent portions may be It may also be used as a locking portion for separation.

The thrust roller bearing assembled as described above has roller 3
Since the flange portion 23 of the outer ring 20 receives a centrifugal force of 1,
The centrifugal force of the rollers 31 does not act on the retainer 30.

In addition, the inner peripheral edge of the cage 30 is connected to the flange 1 of the inner ring lO.
Since there is no flange portion for guiding the outer peripheral edge of the retainer 30, there is no wear on this portion.

Further, since there are only claws 12 in at least two places and no flange portion around the outer peripheral edge of the retainer 30, the flow of lubricating oil is improved.

FIG. 3 shows another embodiment of the inner ring 10 of FIG. The radius D/2 of the outer peripheral edge of the raceway portion 1) of the inner ring 10 is larger than the radius of the outer diameter surface of the pawl 12.

The thrust roller bearing using the inner ring 10 of this embodiment can be attached to a housing 40 as shown in FIG. 4, or to a shaft 50 as shown in FIG.

FIG. 6 shows another embodiment of the first invention. The flange portion 23 of the outer ring 20 is extended radially outward from the outer peripheral edge of the retainer 30 to provide a straight portion 23a, and this straight portion 23a is non-separably engaged by the tips of the claws 12 of the inner ring 10. It is intended to be stopped.

According to this embodiment, even when the diameter of the rollers 31 is large (for example, three or more fins), more reliable non-separable locking is possible.

FIG. 7 is a longitudinal sectional side view showing the upper half of the second invention, and FIG. 8 shows a part of the front view. In the figure, reference numeral 10 indicates an inner ring, 30 indicates a retainer, and 31 indicates a roller.

In the inner ring IO, a flange portion 14 is formed by bending the outer circumferential side of the raceway portion 1) made of an annular steel plate toward the raceway surface 1) a side, and the outer circumferential edge of the extended portion of the flange portion 14 is divided into four equal parts in the circumferential direction. A pawl 12 rising toward the raceway surface 1)a side is provided at this location, and a tab 12a protruding radially inward is caulked at the center of the tip of the pawl 12. Further, a flange portion 13 is formed on the inner peripheral edge of the raceway portion 1) by bending it toward the raceway surface 1)a side.

On the raceway surface 1) a of the inner ring 10, rollers 31 assembled to a cage 30 are disposed in a movable manner.

In the inner ring IO of the thrust roller bearing configured as described above, the inner surface of the outer flange portion 14 is a guide surface for the outer diameter head of the roller 31, and the outer diameter surface of the inner flange portion 13 is the cage 30. a guide surface for the inner peripheral edge of the retainer 30;
The outer circumferential edge of the inner ring 10 is arranged so as not to come into contact with the inner diameter surface of the pawl 12 of the inner ring 10.

The rollers 31 with cage 30 are connected to the inner ring 10,
When the cage 30 is pushed in using the elastic deformation of the claws 12, the outer peripheral edge of the cage 30 is locked by the tabs 12a of the claws 12, and the cage 30 and rollers 31 move in the axial direction while the bearing is being handled. However, it will not be separated from the inner IO,
Constructed as a non-separable bearing.

The claws 12 of the inner ring 10 may be provided at two locations at approximately equal intervals in the circumferential direction, and the entire tip of the claws 12 may be bent inward in the radial direction, and the bent portions may not be separated. It may also be used as a locking part for use.

The thrust roller bearing assembled as described above has roller 3
Since the flange portion 14 on the outer peripheral side of the inner ring lO receives the centrifugal force of 1, the centrifugal force of the rollers 31 does not act on the cage 30.

Further, since the inner circumferential edge of the retainer 30 is guided by the flange portion 13 on the inner circumferential side of the inner ring 10, and there is no flange portion for guiding the outer circumferential edge of the retainer 30, wear of this portion is eliminated.

Further, since there are only claws 12 in at least two places and no flange portion around the outer peripheral edge of the holder 2S30, the flow of lubricating oil is improved.

〔Effect of the invention〕

As explained above, according to the present invention, wear on the cage due to rollers, wear on the contact surface between the outer peripheral edge of the cage and the flange of the outer ring, seizure, etc. are reduced, and the flow of lubricating oil is improved. Therefore, a thrust roller bearing with significantly improved durability life can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the first invention;
FIGS. 2(a) and (b) are enlarged sectional views taken along line A-A and line B-I3 in FIG. 1, respectively, and FIG. 3 is a front view of the right half showing another embodiment of the first invention. , FIG. 4 and FIG. 5 are sectional views showing the mounting state of the bearing, respectively, and FIG. 6 is a partial vertical sectional side view showing still another embodiment of the first invention.
FIG. 7 is a longitudinal cross-sectional side view of the upper half showing an embodiment of the second invention;
FIG. 8 is a front view of a portion thereof. In the figure, 10 is the inner ring, 1) is the raceway, Ila is the raceway surface, 1
2 is a pawl, 12a is a tab of the pawl, 13 is a flange portion for guiding the inner peripheral edge of the retainer, 14 is a flange portion for guiding the outer diameter side of the roller, 20 is an outer ring, 21 is a raceway portion, 21a is a raceway surface, 23
A flange portion for guiding the outer diameter side of the roller, 30 is a retainer,
31 is Koro. Patent applicant NSK Ltd. agent Patent attorney Tetsuyo Mori

Claims (2)

[Claims] (1) An inner ring having claws that stand up toward the raceway surface at at least two locations on the outer periphery of the raceway, and a flange portion for guiding the inner periphery of the retainer formed on the inner periphery by bending toward the raceway surface; Equipped with an outer ring in which a flange for guiding the outer diameter side of the roller is bent toward the raceway surface on the outer peripheral edge of the raceway, and a roller with a cage installed between the raceway surfaces of the inner ring and the outer ring. A thrust roller bearing in which a flange portion of an outer ring is inseparably engaged with a tip of a pawl of the inner ring. (2) A flange portion for guiding the outer diameter side of the roller is formed on the outer circumferential side of the raceway portion by bending toward the raceway surface side, and the flange portion has claws that stand up toward the raceway surface side at at least two locations on the outer circumferential edge. ,
and an inner ring in which a flange for guiding the inner peripheral edge of the cage is bent toward the raceway surface on the inner peripheral edge of the raceway, and rollers with a cage built into the raceway surface of the inner ring, and the claws of the inner ring A thrust roller bearing in which the outer peripheral edge of a cage is inseparably locked to the tip of the cage.