JP2509246Y2 - Thrust needle roller bearing - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention relates to a thrust needle roller bearing, and more particularly to a thrust needle roller bearing having a structure in which a cage is attached to one race so as not to slip out. .

<Prior Art> An example of a conventional thrust needle roller bearing of this type will be described with reference to FIG.

This thrust needle roller bearing has a large number of needle rollers 1,
From a retainer 2 formed by axially connecting two annular plates 4 and 5, and an annular race 3 arranged on one side of the retainer 2 and on which the retainer 2 is mounted so as not to slip out. Become.

A plurality of pockets 2a formed of rectangular holes penetrating in the axial direction are radially provided at several places on the circumference of the cage 2, and the needle rollers 1 are exposed in the pockets 2a in the vertical direction. It is held in. On the outer periphery of Race 3,
A cylindrical peripheral wall portion 3a that surrounds the cage 2 is provided, and at several circumferential positions (three locations) of the peripheral wall portion 3a, claw portions 8 that project toward the center side are provided. That is, the claw portion 8 prevents the cage 2 from being pulled out from the race 3.

<Problems to be Solved by the Invention> By the way, the thrust needle roller bearing having the above configuration has the following disadvantages.

The race 3 is quench-hardened due to the raceway surface of the needle roller 1. However, since the bending is difficult after the quench-hardening, the claw portion 8 of the race 3 is usually bent and formed. It is hardened by quenching.

When the cage 2 is assembled in the race 3, the claw portion 8 of the race 3 interferes with the cage 2 and the cage 2 cannot be mounted without resistance. As shown, the cage 2 is assembled to the race 3 in an inclined posture to some extent, and then the cage 2 is pressed to the inside of the race 3 at the position where the claw portion 8 is present, so that the cage 2 is held. The outer peripheral portion is elastically deformed by the contact with the hardened nail portion 8 to pass through the nail portion 8.

However, when the outer peripheral portion of the cage 2 is passed through the claw portion 8, since the two annular plates are in contact with each other at the beginning of passage,
The pawl portion 8 passes through the pawl portion 8 without being substantially deformed, but the outer peripheral portion 4a of the first annular plate 4 which is weaker in strength after the outer peripheral portion 5a of the second annular plate 5 has passed is the pawl portion 8. There is a case where the sheet is caught in the area and is bent and deformed so as to be locally turned up as shown by 4b in FIG. The local bending deformation portion 4b may interfere with the claw portion 8 during the rotating operation, and the interference may serve as a rotational resistance of the cage 2 to increase the rotational torque of the bearing. Absent.

Further, the cage 2 in the illustrated example connects the two annular plates 4 and 5 only by caulking at the shoulder portion 6 of the radially overlapping portion on the inner periphery, and the two annular plates 4 and 5 on the outer periphery. As described above, when the bending resistance portion 4b generated in the outer peripheral portion 4a of the first annular plate 4 and the claw portion 8 cause rotation resistance as described above, the two annular plates are This makes it easier for the needle rollers 4 and 5 to rotate relatively, and the rolling resistance of the needle roller 1 itself is likely to increase.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the above-mentioned inconvenience caused when the retainer is assembled to the race by making a simple improvement on the retainer.

<Means for Solving the Problems> The present invention is directed to a retainer in which two annular plates are axially connected to each other in at least one of the inner and outer peripheries, and a large number of retainers radially arranged and retained by the retainer. A needle roller and an annular race in which a retainer holding the needle roller is housed, and a retainer dropout prevention portion is formed at a peripheral edge portion of the annular race facing the palm portion of the retainer. The thrust needle roller bearing having the above structure has the following structure.

In the present invention, the annular race includes an annular plate main body portion that is substantially parallel to the retainer in the axial direction, and a cylindrical portion provided on the peripheral side where the palm portion of the retainer is present in the annular plate main body portion. The fall prevention portion of the annular race is composed of a claw portion that is provided at a circumferential position of the cylindrical portion in a radial direction so as to have a length that axially overlaps the palm portion of the retainer.
Further, in the cage, a notch having a size that allows passage of the claw portion is provided in a palm portion of the first annular plate on the rear side in the mounting direction with respect to the annular race. Further, in the retainer, the palm portion of the second annular plate on the front side in the direction of incorporation with respect to the annular race is plastically deformed by contact with the claw portion when the retainer is incorporated into the annular race, and is plastically deformed. It is engaged against the notch.

<Operation> According to the above configuration, assembling the retainer holding the needle roller group to the race is performed by locally deforming the palm portion of the retainer with respect to the hardened fall-out preventing portion as in the conventional case. At this time, the retainer is attached to the race so that the notch formed in the palm part of the annular plate located at the rear in the assembling direction faces the fall prevention part, and the assembly is performed. .

Then, the palm part of the annular plate on the front side in the mounting direction, which closes the notch of the annular plate on the rear side in the mounting direction, passes through the fall prevention part while being deformed to the rear side in the mounting direction by the fall prevention part. become. Also, by this passage, the deformed portion of the annular plate located in the front in the assembling direction is engaged with the notch in the annular plate on the rear side in the assembling direction.

In other words, in the palm part of the two annular plates, there is no need for deformation to interfere with the fall prevention part of the race, and the bending deformation part of the annular plate on the front side in the mounting direction is the rear side in the mounting direction. In order to engage the notches of the two annular plates, the deformation of one of the annular plates during installation rather serves to prevent the relative rotation of both annular plates with good results.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 4 show an embodiment of the present invention. In the drawing of this embodiment, the same parts and portions as those shown in the drawing of the conventional example are designated by the same reference numerals.

The needle roller bearing according to this embodiment has a large number of needle rollers 1.
It is basically the same as the needle roller bearing described in the conventional example in that it is composed of the cage 2, and one annular race 3.

In the present embodiment, a configuration different from the conventional example is that a claw portion 8 as a fall-off preventing portion of the race 3 is provided on the outer peripheral portion of one of the two annular plates 4 and 5 forming the cage 2. A notch 7 having a size that allows passage is provided, and a part of the palm portion, that is, the outer peripheral portion of the other annular plate 4 is engaged with the notch 7.

Specifically, in the cage 2, a semicircular shape having a size that allows passage of the claw portion 8 of the race 3 at several circumferential positions on the outer peripheral edge of the first annular plate 4 on the rear side in the direction of incorporation with respect to the race 3. The notches 7 are provided, and a part of the outer peripheral portion 5a of the second annular plate 5 on the front side in the assembly direction with respect to the race 3 is engaged in the notches 7 in a recessed manner. In the present embodiment, the cutout 7
The number of is set to three corresponding to the number of claw portions 8.

Next, a procedure and an operation of assembling the cage 2 to the race 3 will be described.

First, as shown in FIG. 4, the cage 2 is inclined relative to the race 3 and a part of the outer peripheral portion of the cage 2 is engaged. At this time, the retainer 2 is applied to the race 3 so that the notch 7 formed in the outer peripheral portion of the first annular plate 4 located rearward in the assembling direction faces the claw portion 8 of the race 3. Then, a portion of the cage 2 corresponding to the claw portion 8 of the race 3 is pressed toward the race 3 side. As a result, a part of the outer peripheral portion 5a of the second annular plate 5 on the front side in the assembling direction is claw portion 8.
When it comes into contact with and is locally bent and deformed in the backward direction, it passes through the claw portion 8. By this passage, as shown in FIG. 3, the bending deformation portion 5b of the outer peripheral portion 5a of the second annular plate 5 is engaged in the notch 7 of the first annular plate 4 in a recessed manner.

When the race 3 is formed with the three claw portions 8 as in the embodiment, the outer peripheral portion of the retainer 2 can be inserted into the two claw portions 8 first, and thus the remaining one claw portion 8 can be inserted. It suffices to perform force fitting only by pressing on the claw portion 8,
Therefore, the notch 7 may be formed only at one place.

Further, in the above embodiment, the claw portion 8 is formed on the outer peripheral portion of the race 3 and the notch is provided on the outer peripheral edge portion of the first annular plate 4 of the cage 2, but the claw portion is formed on the inner peripheral portion of the race 3. Alternatively, the notch may be provided in the first annular plate 4 by correspondingly forming a palm portion on the inner peripheral side thereof.

<Effects of the Invention> As described above, according to the present invention, the claw portion is allowed to pass through the palm portion of the annular plate on the rear side in the direction of incorporation of the two annular plates constituting the cage 2. By simply modifying it by forming a notch of a size, it is possible not only to eliminate the increase in rotational resistance due to interference with the race of the local bending deformation portion due to the passage of the claws, but rather to this bending deformation. It was possible to obtain a structure that prevents the relative rotation of the two annular plates by utilizing, and it resulted in improved performance.

[Brief description of drawings]

1 to 4 relate to an embodiment of the present invention. FIG. 1 is a side view showing the entire thrust roller bearing, FIG. 2 is a longitudinal sectional view of the thrust roller bearing, and FIG. 3 is FIG. In A-
A sectional view taken along the line A and FIG. 4 are vertical sectional views showing the assembled state. FIG. 5 shows a conventional thrust roller bearing,
It is a longitudinal cross-sectional view corresponding to a figure. 1 ... Needle roller, 2 ... Cage 3 ... Lace, 3a ... Outer peripheral wall 4 ... First annular plate, 4a ... Outer peripheral part 5 ... Second annular plate, 5a ... Outer peripheral part 7 ... … Notches, 8 …… Claws (falling prevention part)

Claims (1)

(57) [Scope of utility model registration request] 1. A cage in which two annular plates are axially connected to each other in at least one of an inner circumference and an outer circumference, a plurality of needle rollers arranged and held radially by the holder, and the needle shape. A thrust needle roller bearing having a structure in which an annular race accommodating a cage holding rollers is formed, and a retainer dropout prevention portion is formed at a peripheral edge portion of the annular race facing the palm portion of the cage. The annular race includes an annular plate body portion that is substantially parallel to the retainer in the axial direction, and a cylindrical portion provided on the peripheral side where the palm portion of the retainer exists in the annular plate body portion. The retaining portion of the annular race comprises a claw portion that is radially provided at a circumferential position of the cylindrical portion to a length that axially overlaps the palm portion of the retainer, and the retaining portion First ring on the rear side in the mounting direction with respect to the ring race in the container Is provided with a notch having a size that allows passage of the claw portion, and the palm portion of the second annular plate on the front side of the retainer in the direction of incorporation with respect to the annular race is the annular race. Thrust needle roller bearing, wherein the thrust needle roller bearing is plastically deformed by being brought into contact with the claw portion when the retainer is assembled to the notch and is engaged with the notch of the first annular plate.