WO2020179511A1

WO2020179511A1 - Retainer-equipped roller, and roller bearing

Info

Publication number: WO2020179511A1
Application number: PCT/JP2020/007131
Authority: WO
Inventors: 理之冨加見
Original assignee: Ntn株式会社
Priority date: 2019-03-05
Filing date: 2020-02-21
Publication date: 2020-09-10
Also published as: KR20210130733A; CN113474566A; JP7356233B2; JP2020143707A

Abstract

A retainer-equipped roller (1) is provided with a roller (2) and a retainer (3). Chamfered portions (23) are formed at both ends in the axial direction of the roller (2). The retainer (3) includes a pair of annular portions (30), a plurality of pillar portions (33), and a pocket portion (40) for accommodating the roller. The pair of annular portions (30) each include a flange portion (31) which extends in a radially inward direction. An axial direction dimension (L2), during assembly to a track member (50), from a point of contact (C) between an axial direction end portion (22) of the roller and the flange portion (31) to an axial direction end surface (41) of the pocket portion is less than an axial direction dimension (L1) of the chamfered portion (23) of the roller.

Description

Rollers and roller bearings with cage

The present invention relates to a roller with a cage and a roller bearing used in, for example, a transmission.

Conventionally, for example, Patent Document 1 (Japanese Patent Laid-Open No. 9-151944) is known as a cage of a roller with a cage that can be accurately assembled to a mating shaft.

Patent Document 1 provides roller holding claws protruding toward the pocket at both ends of the inner diameter side of the pillar portion of the cage in order to keep the inclination of the rollers with respect to the cage small when assembling to the mating shaft. It is disclosed.

JP-A-9-151944

The cage of the roller with cage of Patent Document 1 can suppress the inclination of the roller with respect to the cage to be small. However, Patent Document 1 focuses only on the inclination of the roller with respect to the cage, and when the roller with the cage is assembled to the mating shaft, if the roller slips into the inner diameter side of the end of the pocket, the roller is mated. If the roller with cage is not inserted into the mating shaft, it may be sandwiched between the shaft and the end of the pocket, and the assemblability may deteriorate.

The present invention has been made to solve the above problems, and an object thereof is to provide a roller with a cage and a roller bearing capable of improving the assemblability to a race member (a mating shaft). The purpose is to provide.

As a result of diligent research, the present inventors did not suppress the tilt of the roller with respect to the cage in order to improve the assembling property of the roller with the cage to the track member, but the roller when the roller is tilted. The present invention has been completed by finding that the roller with cage can be easily inserted into the raceway member by focusing on the contact state between the cage and the cage.

That is, a roller with cage according to one aspect of the present invention includes a roller and a cage that holds the roller, and supports a raceway member having a raceway surface on which the roller rolls. In the roller with a cage, chamfered portions are formed at both ends in the axial direction of the roller, and the cage extends in the axial direction with a pair of annular portions provided at intervals in the axial direction. It has a plurality of pillars connecting the pair of annular portions and a pocket portion provided between adjacent pillars to accommodate the rollers, and the pair of annular portions have a flange portion extending inward in the radial direction. The axial dimension from the contact point between the axial end of the roller and the flange to the axial end surface of the pocket when assembling to the race member is the axial dimension of the chamfer of the roller. Smaller than.

A roller bearing according to one aspect of the present invention includes a bearing ring and the above-described cage-equipped roller.

According to the present invention, it is possible to provide a roller with a cage and a roller bearing that can improve the assemblability to a race member.

It is a perspective view which shows the roller with a cage in embodiment of this invention. It is a partially omitted sectional view showing a roller with cage according to an embodiment of the present invention. It is a partially enlarged view of a roller. It is a partially enlarged sectional view which shows the annular part of a cage. It is a figure explaining the state which integrated the race member into the roller with a cage. It is a figure explaining the state before incorporating a race member in a roller with a cage. (A) is a figure explaining the state which the roller inclined when incorporating a race member in a roller with a retainer, and (b) is a partial enlarged view of Drawing 7 (a). (A) is a diagram for explaining a state in which the roller is tilted when the track member is incorporated into a conventional roller with a cage, and (b) is a partially enlarged view of FIG. 8 (a). (A) is a partially omitted sectional view showing a roller with cage in which a collar portion is inclined inward in the axial direction, and (b) is a partially omitted sectional view showing a roller with cage in which a collar portion is inclined outward in an axial direction. is there.

An embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference characters and description thereof will not be repeated.

First, with reference to FIGS. 1 to 5, the roller 1 with cage according to the present embodiment will be described. In the following description, the direction along the central axis of the cage 3 is referred to as "axial direction", the direction orthogonal to the central axis is referred to as "diameter direction", and the circumferential direction around the central axis is referred to as "circumferential direction". Call.

The roller 1 with cage according to the present embodiment includes a plurality of rollers 2 and a cage 3 that holds the rollers 2.

As shown in FIG. 5, the roller 1 with cage supports a raceway member (here, the shaft 50) having a raceway surface 51 on which the roller 2 rolls. The track member 50 is a member provided inside the roller 2 in the radial direction. The roller with cage 1 is used, for example, in a transmission, and the outer peripheral surface of the shaft of the transmission serves as a raceway surface. Here, the roller 2 is a needle-shaped roller. That is, the roller with cage 1 according to the present embodiment is a needle roller with cage. The race member 50 when the roller 1 with cage according to the present embodiment is used as a pinion bearing of a planetary speed reducer is a pinion shaft. Further, the track member 50 is not limited to the shaft, but may be an inner ring.

The rollers 2 have chamfered portions 23 formed at both ends in the axial direction. In particular, as shown in FIG. 3, the chamfered portion 23 is a rounded portion provided at a corner between the rolling surface 21 which is the outer peripheral surface of the roller 2 and the axial end portion 22 of the roller 2. Specifically, the chamfered portion 23 is an R chamfer. The axial dimension of the chamfered portion 23 is L1. The axial direction referred to here is the longitudinal direction of the roller 2, and when the roller 2 is tilted in the cage 3, the roller 2 is tilted along with the tilt of the roller 2. The rollers 2 are held by the cage 3 at equal intervals in the circumferential direction. In FIGS. 2 and 5, the roller 2 is shown by a broken line for easy understanding.

As shown in FIGS. 1 and 2, the cage 3 has a pair of annular portions 30 provided at intervals in the axial direction, and a plurality of pillar portions 33 connecting the pair of annular portions 30 to each other. A pocket portion 40 for housing the roller 2 is provided between the adjacent pillar portions 33. The pocket portion 40 has a substantially rectangular shape in a plan view and extends in the axial direction. A plurality of pocket portions 40 are provided at intervals in the circumferential direction. Rollers 2 are housed in the pockets 40, respectively. The method for manufacturing the cage 3 is not limited, and examples thereof include a weld cage, a press cage, and a scraping cage.

The pillar portion 33 of the present embodiment includes a pillar central portion 34 that is relatively radially inside in an axial central area thereof, and a pair of pillars that are relatively radially outward in an axial end area. A pair of column inclined portions 36 located between the end portion 35 and each of the column central portion 34 and the pair of column end portions 35 and extending radially inward from the column end portion 35 toward the column central portion 34. including. In particular, as shown in FIG. 1, the pair of annular portions 30 and the pillar end portion 35 of the pillar portion 33 are connected by a constriction portion 11 that is narrower than the circumferential length of the pillar end portion 35.

In particular, as shown in FIG. 2, the wall surface of the column portion 33 facing the pocket portion 40 is provided with first and

second roller stoppers

34a, 35a for preventing the roller 2 from falling off inward and outward in the radial direction. ing. The first roller stopper 34a is provided radially downward over substantially the entire axial area of the column central portion 34. The second roller stopper portion 35a is provided on the radially outer side over substantially the entire area in the axial direction of the pair of column end portions 35.

As shown in FIGS. 2 and 4, the pair of annular portions 30 includes a flange portion 31 extending inward in the radial direction and a protruding portion 32 connecting the collar portion 31 to the pillar portion 33. The axial dimension from the inner diameter side end portion 31a of the collar portion 31 to the axial end surface 41 of the pocket portion 40 (hereinafter referred to as pocket end surface 41) is L2. Here, the pocket end surface 41 coincides with the boundary portion between the protruding portion 32 of the annular portion 30 and the pillar end portion 35 of the pillar portion 33.

The axial dimension L2 from the inner diameter side end 31a of the collar 31 to the pocket end 41 is smaller than the axial dimension L1 of the chamfered portion 23 of the roller 2. Specifically, the axial dimension L2 from the inner diameter side end 31a of the flange portion 31 to the pocket end 41 is preferably 1/2 or less of the axial dimension L1 of the chamfered portion 23 of the roller 2. .. As a result, the shaft 50 can be easily inserted into the roller 1 with a cage.

Next, the work of assembling the roller with cage 1 according to the present embodiment to the shaft 50 will be described with reference to FIGS. 6 to 8. 6 to 8, the rollers 2 are shown by broken lines for easy understanding.

First, as shown in FIG. 6, the roller 1 with the retainer and the shaft 50 are aligned so as to be coaxial, and one end face of the retainer 3 and the other end face of the shaft 50 are opposed to each other. Next, the shaft 50 is inserted into the roller 1 with a cage so that the rolling surface 21 of the roller 2 contacts the inner raceway surface 51 of the shaft 50. As a result, the roller 1 with a cage can be assembled to the shaft 50.

The contact state between the roller 2 and the cage 3 when the conventional roller 100 with cage is assembled to the shaft 50 is shown in FIGS. 8(a) and 8(b). With reference to FIG. 8A and FIG. 8B, the pair of annular portions 130 of the conventional roller 100 with a retainer includes a flange portion 131 and a protruding portion 32. In the conventional roller with cage 100, the axial dimension from the pocket end surface 141 to the inner diameter side end 131a of the flange 131 is L3. In this cage-equipped roller 100, the axial dimension L3 from the pocket end surface 141 to the inner diameter side end 131a of the flange portion 131 is smaller than the axial dimension L1 of the chamfered portion 23 of the roller 2 (L3>L1). ..

With such a configuration, in the conventional roller with cage 100, the first contact point B with the pocket end surface 141 and the location 2 is not the chamfered portion 23 of the roller 2 but the rolling surface 21 of the roller 2. That is, as shown in FIG. 8B, the roller 2 contacts the pocket end surface 41 on the rolling surface 21. Therefore, when trying to insert the shaft 50 into the roller with retainer 100, the roller 2 is sandwiched between the shaft 50 and the pocket end surface 141 of the retainer 3, and the retainer 3 is deformed or the roller with retainer is deformed. The 100 may not be easily incorporated into the shaft 50.

On the other hand, the contact state between the roller 2 and the cage 3 when the roller 1 with a cage of the present embodiment is assembled to the shaft 50 is shown in FIGS. 7 (a) and 7 (b). 7(a) and 7(b), in the roller with cage 1 of the present embodiment, the axial dimension L2 from the inner diameter side end 31a of the flange 31 to the pocket end face 41 is: It is smaller than the axial dimension L1 of the chamfered portion 23 of the roller 2 (L1>L2).

With such a configuration, in the roller 1 with a cage of the present embodiment, when the roller 1 with a cage is inserted into the shaft 50, the first contact portion A with the pocket end face 41 and the portion 2 is the chamfered portion of the roller 2. 23. That is, as shown in FIG. 7B, the roller 2 contacts the pocket end surface 41 at the chamfered portion 23. Further, the flange portion 31 and the axial end portion 22 of the second portion 2 come into contact with each other at the second contact point C. As a result, when the shaft 50 is inserted into the roller 1 with the cage, the roller 2 is likely to be sandwiched between the shaft 50 and the pocket end surface 141 of the cage 3, but the roller 2 is chamfered at the first contact point 23. Since it is in contact with A, the roller 2 can easily escape to the outer diameter side. Therefore, the roller 1 with the cage can be easily inserted into the shaft 50, and the assemblability can be improved.

Here, if the retainer is a press retainer in which a circular blank punched from a plate material is formed by a press process including a drawing process, the annular part (the flange part) is formed by bending. When the cage is a weld cage, a steel plate is roll-formed to form a cross-sectional shape with a bent collar, and then a tubular holding is performed after pocket removal, bending, joining, etc. Vessel (annular portion) is formed.

When the retainer 3 is a press retainer or a weld retainer, as shown in FIG. 9A, the flange 131A of the annular portion 130A is axially inward (toward the pillar 33 in the forming process of the flange). It may tilt. Further, as shown in FIG. 9B, the flange portion 131B of the annular portion 130B may be inclined outward in the axial direction (toward the direction opposite to the column portion 33). 9A and 9B, in order to show the inclination of the

collar portions

131A and 131B, a state where the

collar portions

131A and 131B do not incline and extend horizontally in the radial direction is shown by a chain line. ing.

As described above, in the roller with cage 1A having the cage 3A whose collar portion 131A is inclined inward in the axial direction, and in the roller with cage 1B having the cage 3B whose collar portion 131B is inclined outward in the axial direction, If the axial dimension of the chamfered portion 23 of the roller 2 is specified based on the axial dimension from the axial inner side surfaces 131aA, 131aB of the

flange portions

131A, 131B to the pocket end faces 141A, 141B, the standard dimension is obtained. Since variations occur, the ease of incorporation into the mating shaft (race member) 50 becomes insufficient. Therefore, in the present embodiment, also in the roller with retainer 1A and the roller with retainer 1B, the contact between the axial end portion 22 of the roller 2 and the

flange portions

131A and 131B at the time of assembly to the race member 50. The axial dimension of the chamfered portion 23 of the roller 2 is defined based on the axial dimension from the location to the pocket end surfaces 141A and 141B.

In the above embodiment, needle rollers are used as the rollers 2 accommodated in the pocket 40, but the present invention is not limited to this, and cylindrical rollers or rod rollers may be used.

In the above embodiment, the axial dimension L2 is described as the dimension from the inner diameter side end 31a of the flange 31 to the pocket end 41, but the dimension L2 is not limited to this. For example, when the collar portion 31 is inclined inward or outward in the axial direction, the axial dimension L2 is such that the second contact point C (where the axial end portion 22 of the roller 2 and the collar portion 31 are The dimensions may be from FIG. 7B) to the pocket end face 41.

Further, in the above embodiment, the cage 3 is a so-called M-type cage having a pair of annular portions, but the present invention is not limited to this, and for example, a straight-type cage in which the pillar portion 33 does not bend may be used. Good.

Further, the roller 1 with cage according to the present embodiment may be provided with a bearing ring and provided as a roller bearing. Specifically, in addition to the roller 1 with the cage, it may be provided as a shell type roller bearing or a solid type bearing further provided with an outer ring.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

1 roller with cage, 2 rollers, 3 cage, 22 axial end, 23 chamfer, 30 annular, 31 collar, 31a inner diameter side end, 33 pillar, 40 pocket, 41 pocket end (shaft) Direction end face), 50 track members, C contact points, L1, L2 axial dimensions.

Claims

A roller with a cage, comprising a roller and a cage for holding the roller, and supporting a raceway member having a raceway surface on which the roller rolls,
The rollers have chamfered portions formed on both axial ends thereof,
The cage is provided between a pair of annular portions that are provided at intervals in the axial direction, a plurality of column portions that extend in the axial direction and connect the pair of annular portions, and between the adjacent column portions. And a pocket portion for accommodating the roller,
The pair of annular portions includes a collar portion that extends radially inward,
The axial dimension from the contact point between the axial end portion of the roller and the flange portion to the axial end surface of the pocket portion during assembly to the raceway member is the axial direction of the chamfered portion of the roller. Roller with cage, smaller than the size of.
With the outer ring
A roller bearing comprising: the roller with cage according to claim 1.