JP2011127645A - Roller bearing and cage for roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing which prevents metal contact between the pocket end face of a cage and the roller end face to prevent abrasion in this part. <P>SOLUTION: This roller bearing 1 includes: a ring-like metallic cage 2, both ends of which are provided with flange parts 3 extending toward the inside diameter, and which has roller retaining pockets 4 at a plurality of circumferential parts; and a plurality of rollers 5 retained in the pockets 4 of the cage 2. The inside diameter side edges of the inner surfaces of both flange parts 3 of the cage 2 are provided with annular step surfaces 3a recessed like a cutout, and resin-made rings 7 contacting the end faces of the rollers 5 are fitted to the step surfaces 3a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a roller bearing provided with a caged metal cage and a plurality of rollers, and a roller bearing cage.

  In the roller bearing 11 as shown in FIG. 8 having a metal cage, as shown in FIG. 7B, which is an enlarged view of the portion A in FIG. Makes metal contact. Therefore, drilling wear at the contact site becomes a problem. In order to solve this problem, for example, a structure has been proposed in which a groove is provided on the end face of the pocket 14 of the cage 12 to improve the lubricity between the end face 15 and the end face 15 of the pocket 14 ( Patent Document 1).

JP 2009-047294 A

  However, even in the case of a structure in which a groove is provided on the end face of the pocket 14, the effect of reducing drilling wear at the contact portion is not sufficient because the end face of the cage is in metal contact with the end face.

  An object of the present invention is to provide a roller bearing capable of preventing metal contact with a pocket end face and an end face of a cage, and preventing wear at this portion, and a roller bearing cage.

  The roller bearing according to the present invention is a roller bearing including a ring-shaped cage having a plurality of pockets for retaining rollers, and a plurality of rollers held in the pockets. A ring-shaped metal cage main body having pockets for holding the rollers and formed with flanges extending toward the inner diameter at both ends in the axial direction, and the inner diameters of the inner surfaces of both collar portions of the cage body An annular step surface that is recessed in a notch shape is provided on the side edge, and a resin ring that contacts the end surface of the roller is fitted to the step surface.

  According to this configuration, since the resin ring that contacts the roller end surface is fitted to the step surface of the inner surface of the cage collar, metal contact with the pocket end surface and the end surface of the cage is avoided, and drilling wear due to metal contact And heat generation can be reduced. The roller end face and the resin ring make sliding contact, but the friction is reduced due to the self-lubricating property of the resin.

  In the present invention, it is desirable that the end face of the resin ring is in contact with the end face of the roller in the vicinity of the pitch circle center PCD of the roller. Thus, when the end face of the resin ring is brought into contact with the end face of the roller in the vicinity of the roller pitch circle center PCD, the roller can be stably guided.

In this invention, it is desirable that the end face of the resin ring is located on the inner side in the axial direction than the end face of the pocket of the cage body. That is, it is desirable that the end face of the resin ring protrude into the pocket rather than the end face of the pocket of the cage body.
When the end face of the resin ring protrudes into the pocket in this manner, the end face of the roller contacts only the end face of the resin ring, and contact with the end face of the metal pocket is avoided. Therefore, drilling wear due to metal contact can be reliably prevented.

  In the present invention, the resin ring may be composed of a plurality of arcuate segments. As described above, when the resin ring is constituted by a plurality of arc-shaped divided bodies, the resin ring can be easily incorporated into the cage.

  In the present invention, the resin ring may be colored for product identification. When colored for product identification is applied to the resin ring, the roller bearing can be easily distinguished from other similar products by the coloring, and identification due to roller misalignment can be performed at the same time. Since the portion to be colored is a resin ring, the coloring process can be performed more easily than when the cage body is identified.

The roller holding cage according to the present invention includes a ring-shaped metal cage main body having pockets for holding rollers at a plurality of locations in the circumferential direction and formed with flanges extending on the inner diameter side at both ends in the axial direction. An annular stepped surface that is recessed in a notch shape is provided on the inner diameter side edge of the inner surface of both flange portions of the cage body, and a resin ring that contacts the end surface of the roller is fitted to the stepped surface. Features.
According to the roller holding cage of this configuration, as described above with respect to the roller bearing of the present invention, metal contact with the pocket end face and the end face of the cage can be prevented, and wear at this portion can be prevented.

The roller bearing according to the present invention is a roller bearing including a ring-shaped cage having a plurality of pockets for retaining rollers, and a plurality of rollers held in the pockets. A ring-shaped metal cage main body having pockets for holding the rollers and formed with flanges extending toward the inner diameter at both ends in the axial direction, and the inner diameters of the inner surfaces of both collar portions of the cage body An annular step surface that is recessed in a notch shape is provided on the side edge, and a resin ring that contacts the end surface of the roller is fitted to this step surface, so that metal contact with the pocket end surface of the retainer is prevented, Wear at this portion can be prevented.
A roller bearing retainer according to the present invention includes a ring-shaped metal retainer main body having pockets for retaining a roller at a plurality of locations in the circumferential direction and formed with flanges extending toward the inner diameter at both ends in the axial direction. An annular stepped surface that is recessed in a notch shape is provided on the inner diameter side edge of the inner surface of both flange portions of the cage body, and a resin ring that contacts the end surface of the roller is fitted to the stepped surface. It is possible to prevent metal contact between the pocket end face and the end face of the vessel and to prevent wear at this portion.

(A) is a fragmentary sectional view of the roller bearing concerning one Embodiment of this invention, (B) is an expanded sectional view of the B section in (A). It is a perspective view of the roller bearing. It is a fragmentary sectional view which shows the state before fitting the resin-made ring of the roller bearing. It is a perspective view which shows the state before fitting the resin ring of the roller bearing. (A) is a fragmentary sectional view of a resin ring, (B) is a perspective view of the resin ring. (A) is a perspective view of a resin ring divided into two, (B) is a perspective view of a resin ring divided into three. (A) is a fragmentary sectional view of a prior art example, (B) is an expanded sectional view of the A section in (A). It is a perspective view of a prior art example.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1A shows a partial cross-sectional view of the roller bearing of this embodiment, and FIG. 1B shows an enlarged cross-sectional view of part B in FIG. This roller bearing 1 is a roller-type bearing with a cage comprising a ring-shaped metal cage 2 and a plurality of rollers 5 held in a pocket 4 of the cage 2 as shown in FIG. . The cage 2 is formed with flanges 3 extending on the inner diameter side at both ends.

In FIG. 1, the cage 2 includes a ring-shaped metal cage body 2 </ b> A constituting most of the cage 2, and a resin ring 7 provided on a part thereof. The cage main body 2A has the roller holding pockets 4 at a plurality of locations in the circumferential direction, and the flange portions 3 and 3 are formed at both ends in the axial direction.
The retainer main body 2A is a so-called M-type, and the column portions 6 between the pockets 4 have outer diameter side portions 6a at both ends, and inclined portions that continue obliquely from the outer diameter side portions 6a to the inner diameter side. 6c and the inner diameter side portion 6b at the center are formed in a trapezoidal shape, and the entire cross-sectional shape of the cage is substantially M-shaped. The outer diameter side portion 6 a of the column portion 6 is positioned on the outer diameter side with respect to the axial center (pitch circle center PCD) of the roller 5 inserted into the pocket 4, and the inner diameter side portion 6 b is the pitch circle center PCD of the roller 5. Is located on the inner diameter side.

  As shown in partial cross-sectional views and perspective views in FIGS. 3 and 4, annular step surfaces 3 a that are recessed in a notch shape are provided on the inner diameter side edges of the inner surfaces of the flange portions 3 on both sides of the cage body 2 </ b> A. Yes. As shown in FIGS. 1 and 2, a resin ring 7 that comes into contact with the end surface of the roller 5 is fitted to each of the step surfaces 3 a. By this fitting, the resin ring 7 is sandwiched between the step surface 3 a and the end surface 5 of the retainer collar 3, so that it does not fall off from the retainer 2. 5A and 5B show a partial cross-sectional view and a perspective view of an example of the resin ring 7.

  According to the roller bearing 1 having the above configuration, the resin ring 7 that contacts the end surface of the roller 5 is fitted to the stepped surface 3a of the inner surface of the flange portion 3 of the cage 2, so that the end surface 5 of the cage pocket 4 is located. Metal contact with the end face is avoided, and drilling wear and heat generation due to metal contact are reduced.

  In this embodiment, the axial width dimension of the resin ring 7 is set to be larger than the recess depth of the step surface 3a on the inner surface of the cage collar 3, and the resin ring 7 is fitted to the step surface 3a. The inward end surface of the ring 7 is disposed at a position protruding inward in the axial direction from the end surface of the pocket 4 of the cage 2. Therefore, the end surface of the roller 5 does not contact the pocket end surface that is the inner surface of the flange portion 3 in the metal cage main body 2 </ b> A, but only contacts the end surface of the resin ring 7. Therefore, metal contact with the end face of the cage pocket 4 can be avoided reliably, and drilling wear due to metal contact can be reliably prevented.

  Further, as shown in FIG. 1B, the outer diameter of the resin ring 7 is set in the vicinity of the roller pitch circle center PCD, and the inner diameter of the resin ring 7 is the same as or larger than the inner diameter of the cage flange 3. It has become. Thereby, since the inward end surface of the resin ring 7 contacts the end surface of the roller 5 in the vicinity of the roller pitch circle center PCD, the roller 5 can be stably guided.

Although FIG. 5 shows a configuration example in which the resin ring 7 is a complete ring, the resin ring 7 may be composed of a plurality of arc-shaped divided bodies 7a and 7b as shown in FIG. . FIG. 6A shows a configuration example in which the resin ring 7 is composed of two arc-shaped divided bodies 7a, and FIG. 6B shows a configuration example in which three resin-shaped divided bodies 7b are formed.
Thus, when the resin ring 7 is constituted by a plurality of arcuate divided bodies 7a and 7b, the resin ring 7 can be easily assembled into the cage 2.

  In this embodiment, the resin ring 7 has a color different from that of the cage body 2A, and the resin ring 7 is colored for product identification. For example, a different color is given for each type of roller bearing. As described above, since the resin ring 7 is colored for product identification, the roller bearing 1 can be easily distinguished from other similar products. Can do.

  The roller bearing 1 of the above embodiment is a roller type bearing with a cage, and the outer periphery of a shaft in a device in which the bearing is incorporated and the inner peripheral surface of a part such as a housing or a gear are the raceway surfaces of the rollers 5. However, in addition to the cage 2 and the roller 5 of FIG. 1, a bearing with a bearing ring provided with both an inner ring and an outer ring (not shown) or either an inner ring or an outer ring may be used. .

DESCRIPTION OF SYMBOLS 1 ... Roller bearing 2 ... Cage 2A ... Cage body 3 ... Cage 4 ... Pocket 5 ... Roller 7 ... Resin ring 7a, 7b ... Arc-shaped division body of resin ring

Claims (6)

In a roller bearing having a ring-shaped cage having a plurality of pockets for holding rollers, and a plurality of rollers held in the pockets,
The cage includes a ring-shaped metal cage main body having pockets for retaining the rollers at a plurality of locations in the circumferential direction and formed with flanges extending on the inner diameter side at both ends in the axial direction. A roller having an annular step surface that is recessed in a notch shape on the inner diameter side edge of the inner surface of both flange portions of the main body, and a resin ring that contacts the end surface of the roller is fitted to the step surface. bearing.   2. The roller bearing according to claim 1, wherein the end face of the resin ring contacts the end face of the roller in the vicinity of the center of the pitch circle of the roller.   3. The roller bearing according to claim 1, wherein an end surface of the resin ring is positioned on an inner side in an axial direction than an end surface of a pocket of the cage body.   4. The roller bearing according to claim 1, wherein the resin ring includes a plurality of arc-shaped divided bodies. 5.   5. The roller bearing according to claim 1, wherein the resin ring is colored for product identification. A ring-shaped metal cage body having pockets for holding rollers at a plurality of locations in the circumferential direction and formed with flanges extending toward the inner diameter at both ends in the axial direction. A roller bearing retainer characterized in that an annular step surface that is recessed in a notch shape is provided on the inner diameter side edge of the inner surface, and a resin ring that contacts the end surface of the roller is fitted to the step surface.

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