JP2005121117A - Roller bearing and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing which can reduce its manufacturing cost and can secure its lubrication performance. <P>SOLUTION: Flange portions 5, 6 are formed on both sides of an outer race 1 so as to be bent toward a raceway track portion 4 such that one flange portion 5 is arranged so as to be eccentric in the radial direction with respect to the other flange portion 6 (the outer race 1). A retainer 3 is inserted from the opening of the flange portion 5 having a diameter larger than that of the retainer 3. A space between the raceway track portion 4 of the outer race 1 and the outside diameter surface of the retainer 3 is used as a lubricant holding space 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in a roller bearing in which a plurality of rollers capable of rolling a raceway portion of an outer ring and a cage for holding the same are incorporated into an outer ring having flanges at both ends of the raceway. .

Various types of roller bearings have been proposed in which an outer ring having flanges at both end edges of the raceway and a plurality of rollers that can freely roll the raceway part of the outer race are integrated by a cage (for example, patents) Reference 1). As the outer ring of such a roller bearing, there are a type in which the shape of the flange of the outer ring is bent at a substantially right angle with respect to the outer ring raceway part, and a type in which the outer ring is bent so as to overlap the outer ring raceway part.
Shoko 52-30427

  In the former type in which the shape of the outer ring collar is bent at a right angle to the outer ring raceway part, one of the collars is bent, and this assembly is assembled from the other to the outer ring with the roller held in a cage. After that, the other hook is bent so that the outer ring, the rollers and the cage are not separated. However, in this case, the process of post-bending the other scissors is necessary, and the accompanying annealing process is required, resulting in high manufacturing costs.

  On the other hand, in the latter type in which the outer ring collar is overlapped with the outer ring raceway part, the collars on both sides are bent in advance, the cage is assembled in the outer ring, and the rollers are inserted from the radially inner side of the cage. Since it fits, post-bending processing as described above becomes unnecessary. In addition, by setting the cage diameter smaller than the inner diameter of the collar, the cage can be easily attached to the outer ring, and then the roller bearing can be easily installed by attaching the roller to the cage pocket. Can be manufactured.

  However, in this case, since both ends of the roller are arranged so as to come into contact with the end surface of the flange, a space for holding a lubricant (for example, grease) becomes scarce.

  The roller bearing of the present invention is composed of an outer ring having flanges extending radially inward on both sides in the axial direction, a plurality of rollers capable of rolling the raceway portion of the outer ring, and a cage that holds these rollers. The center of the inner diameter surface of one collar and the center of the inner diameter surface of the other collar are arranged eccentrically by a predetermined amount in the radial direction, and the diameter of the inner diameter of one collar is the diameter of the outer diameter of the cage And the diameter of the inner diameter surface of the other collar is set smaller than the diameter of the outer diameter surface of the cage, and the axial width of the cage is the axis between the axially inner end surfaces of both collars. It is characterized in that it is formed smaller than the width in the direction, and one of the flanges and the cage has an overlapping region projected in the axial direction and overlapping with each other in a circumferential region.

  According to the roller bearing configured as described above, the diameter of the inner diameter surface of one of the flanges is set larger than the diameter of the outer diameter surface of the cage, so that the cage can be easily placed in the outer ring without any special work. Can be attached to.

  After the cage is mounted, the cage is arranged almost concentrically with the outer ring by the roller, and when the roller receives an axial force when using the roller bearing, the cage hits one of the flanges. Therefore, the retainer and the rollers can be prevented from being pulled out.

  In particular, although the diameter of the inner diameter surface of one of the collars is set slightly larger than the diameter of the outer diameter surface of the cage, when one of the collars and the cage is projected in the axial direction, both are located in a predetermined region in the circumferential direction. Since it has the overlapping area | region which overlaps, since a holder | retainer will contact | abut one hook part in an overlapping area | region when it moves to the side of one collar part, it becomes possible to hold | maintain a retainer and a roller.

  As a preferred embodiment of the present invention, a lubricant holding space is formed between the raceway portion of the outer ring and the outer diameter surface of the cage.

  Conventionally, roller bearings that have had their flanges bent along the raceway of the outer ring are difficult to retain lubricant, and when used under low load and high speed conditions, seizure due to lubricant depletion occurs. It was easy to occur. However, the space between the outer ring raceway and the outer diameter surface of the cage is used as a lubricant holding space, so that, for example, even when roller bearings are used under low load and high speed conditions, the depletion of lubricant is effective. Since the predetermined lubrication performance can be maintained over a long period of time, the life of the roller bearing can be extended compared to this type of conventional roller bearing.

  The method of manufacturing a roller bearing having the above-described configuration is such that the center of the inner diameter surface of one flange portion is formed eccentrically by a predetermined amount in the radial direction with respect to the axial center of the outer ring, and the diameter of the inner diameter surface of one flange portion is set. The cage is formed to be substantially equal to or slightly larger than the diameter of the cage, and the cage is inserted into the outer ring through the opening of one of the ribs and placed between the ribs on both sides, and the rollers are mounted in the pockets of the cage To do.

  In this way, since both of the flange portions are processed in advance and the cage is inserted into the outer ring from the opening of one of the flange portions, a heat treatment process for forming the flange portion, for example, an annealing step can be omitted. Therefore, the manufacturing cost of the roller bearing can be reduced.

  In this case, in particular, one of the collars is arranged eccentrically by a predetermined amount in the radial direction with respect to the center of the inner diameter surface of the other collar, so that the radial height of one collar is circumferential. It is different. Therefore, when it is going to bend and form the side where radial direction height is small, the operation | work is difficult, but after forming a metal plate in the cylinder shape of one side open | release, one hook part is formed by punching. Thus, the outer ring can be easily manufactured.

  It is preferable that the following condition is satisfied as the amount of eccentricity of one of the collars. That is, the amount of eccentricity is determined by projecting one flange and the cage in the axial direction to each other in a predetermined region in the circumferential direction in a state where the rollers are mounted on the cage in the outer ring and the outer ring and the cage are aligned. The overlapping region is an amount having a sufficient size in the circumferential direction and the radial direction so that the cage does not come out when it hits one of the collars.

  According to the roller bearing of the present invention, the manufacturing cost can be reduced and a predetermined lubricating performance can be ensured.

  The best mode roller bearing according to the present invention will be described below with reference to the drawings. 1 is an overall side view of the roller bearing, FIG. 2 is a sectional view taken along the line BB in FIG. 1, FIG. 3 is a sectional view taken along the line CC in FIG. 2, and FIG. FIG. 5 is a perspective view of the roller bearing.

  In these drawings, 1 is an outer ring, 2 is a needle roller, 3 is a cage, and the outer ring 1, the needle roller 2 and the cage 3 constitute a roller bearing A. The outer ring 1 has flange portions 5 and 6 that are bent radially inward and substantially perpendicular to the track portion 4 on one side and the other side of the track portion 4. The inner diameter D1 of one flange 5 is set larger than the inner diameter D2 of the other flange 6. The axis P1 of the other flange 6 and the axis P2 of the outer ring 1 coincide. The shaft center P3 of the one flange portion 5 is arranged eccentrically with an eccentric amount δ in the radial direction with respect to the axis P1 of the other flange portion 6.

  With this configuration, the radial height h1 of the other flange portion 6 is the same in the circumferential direction, whereas the radial height h2 of one flange portion 5 is formed to be different in the circumferential direction. The maximum radial height h2 of one flange 5 is set smaller than the radial height h1 of the other flange 6.

  The cage 3 is formed in a ring shape from a synthetic resin. A plurality of roller mounting pockets 7 are formed in the central region in the axial direction of the cage 3 in a circumferentially equidistant manner, and between the pockets 7 are column portions 15. The cage 6 includes annular portions 8 and 9 on both outer sides in the axial direction of the pocket 7. The pocket 7 has roller guide surfaces 7a and 7b whose circumferential width decreases toward the inner diameter side. The outer diameter D3 of the cage 3 is set to be larger than the inner diameter D2 of the other flange portion 6 and smaller than the inner diameter D1 of the one flange portion 5.

  In this way, the shaft center P3 of one flange portion 5 is arranged eccentrically with an eccentric amount δ in the radial direction with respect to the shaft center P1 of the other flange portion 6, and the outer diameter D3 of the cage 3 is set to the one flange portion When the cage 3 is positioned at the center in the radial direction of the outer ring 1 by setting it smaller than the inner diameter D1 of 5, when one of the flanges 5 and the cage 3 is projected in the axial direction, Has an overlapping region R.

  In addition, the axial width E1 of the cage 3 is formed smaller than the axial width E2 between the axially inner end surfaces of the two flange portions 5 and 6.

  An assembling procedure in the roller bearing A having the above configuration will be described. For the outer ring 1, the metal plate is formed into a cylindrical press-molded product that is open on one side, and one of the flanges 5 is punched with the bottom of the press-molded product eccentric with respect to the cylindrical part by an eccentric amount δ.

  The radial height h2 of the flange 5 is formed so as to be different in the circumferential direction, and is particularly difficult when the side having a small radial height h2 is bent and formed. By forming the bottom part of the press-formed product by punching out like this, one of the flange parts 5 can be easily formed. A case where the smaller side of the radial height h2 of the flange 5 is substantially zero is also conceivable. This is a case where the punching tool is formed along the inner diameter surface of the outer ring 1 when punching the bottom of the press-formed product.

  The other collar part 6 is formed by press-molding the formed part so as to be thinner than the other part and bending it. Subsequently, the cage 3 is attached to the outer ring 1, that is, both the flange portions 5 and 6 of the outer ring 1 are formed in advance before the cage 3 is attached.

  When the cage 3 is attached to the outer ring 1, the cage 3 is inserted from the opening 5 </ b> A side of the one flange 5. The opening 5A is formed in a substantially circular shape. In this case, since the diameter D3 of the cage 3 is set to be smaller than the inner diameter D1 of the one flange portion 5, it can be inserted without difficulty from the opening 5A of the one flange portion 5. Thereafter, the cage 3 is held between the both flange portions 5 and 6, and the needle rollers 2 are mounted in the pockets 7 of the cage 3 from the inside in the radial direction of the cage 3.

  In this way, the needle roller 2 is disposed between the axially inner end surfaces 5c and 6c of the flange portions 5 and 6, and is held by the guide surfaces 7a and 7b of the pocket 7. When the needle rollers 2 are installed in the pockets 7, the cage 3 is disposed substantially concentrically with respect to the outer ring 1. In this way, the roller bearing 1 is assembled.

  When the needle roller 2 receives an axial force when the roller bearing 1 is used, the diameter D3 of the cage 3 is set smaller than the inner diameter D1 of the one flange portion 5, but the axial direction of the cage 3 is set. The width E1 is formed to be smaller than the axial width E2 between the axially inner end surfaces of the flange portions 5 and 6, the cage 3 is disposed substantially concentrically with the outer ring 1, and one flange portion When 5 and the cage 3 are projected in the axial direction, the cage 3 hits the flange 5 at the overlap region R because the overlap region R overlaps the predetermined region in the circumferential direction. For this reason, it is prevented that the retainer 3 is pulled out from the outer ring 1. Of course, pulling out to the other flange 6 side is also prevented.

  Furthermore, in the roller bearing 1 having the above-described configuration, the necessary life of the roller bearing 1 can be ensured by providing the lubricant holding space 10 between the raceway portion 4 of the outer ring 1 and the outer diameter surface of the cage 3. it can. Lubricants include grease and lubricating oil.

  In addition, compared to the conventional roller bearing that is formed by bending the hook part on one side and then incorporating a cage fitted with needle rollers into the outer ring and bending the hook part on the other side. A part of the manufacturing process can be omitted, for example, the heat treatment process for annealing can be reduced, and the manufacturing cost can be reduced.

Another preferred embodiment will be described with reference to FIGS. 6 is a side sectional view of the roller bearing, and FIG. 7 is a sectional view taken along the line DD in FIG. The roller bearing 1 in this embodiment is different from the configuration of the roller bearing 1 shown in FIGS. 1 to 5 in an inner diameter D1 of one flange portion 5 and a radial height h2. That is, the maximum value of the radial height h <b> 2 is configured to coincide with the radial height h <b> 1 of the other flange 6.
(1) A configuration in which the shaft center P3 of one flange portion 5 is arranged eccentrically with an amount of eccentricity δ in the radial direction with respect to the axis P1 of the other flange portion 6. (2) Inner diameter of one flange portion 5 D1 is set to be larger than the inner diameter D2 of the other collar part 6. (3) The diameter D3 of the cage 3 is larger than the inner diameter D2 of the other collar part 6, and Configuration configured to be smaller than the inner diameter D1 (5) Configuration in which one flange portion 5 and the retainer 3 are projected in the axial direction, an overlapping region R in which both overlap in a predetermined circumferential direction (6) A configuration in which the axial width E1 of the cage 3 is smaller than the axial width E2 between the axially inner end surfaces of both flange portions 5 and 6 (7) The track portion 4 of the outer ring 1 and the cage 3 The configuration in which the lubricant holding space 10 is formed between the outer diameter surfaces of the first and second outer surfaces is the same as that of the above-described embodiment. Among these, the overlapping region R described in (5) where the two overlap each other is longer in the circumferential direction than in the above embodiment. For this reason, it is possible to more effectively prevent the retainer 3 from being removed.

  The manufacturing method of the roller bearing 1 is the same as that of the said embodiment. Since other configurations are the same as those in the above embodiment, the same reference numerals are given and description thereof is omitted. Also in the roller bearing 1 according to this embodiment, since the lubricant holding space 10 is provided between the raceway portion 4 of the outer ring 1 and the outer diameter surface of the cage 3, the necessary life of the roller bearing 1 is ensured. Further, as compared with the conventional roller bearing, a part of the manufacturing process can be omitted and the manufacturing cost can be reduced, for example, the heat treatment process for annealing can be reduced.

FIG. 1 is an overall side view of a roller bearing showing the best embodiment of the present invention. BB sectional view of FIG. CC sectional view of FIG. 2 Cross-sectional view during assembly of roller bearing Perspective view of roller bearing Side sectional view of a roller bearing showing another preferred embodiment DD sectional view of FIG. 6

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Needle roller 3 Cage 5,6 Gutter 5A Opening 7 Pocket 10 Lubricant holding space A Roller bearing

Claims (4)

A roller bearing composed of an outer ring having flanges extending radially inward on both sides in the axial direction, a plurality of rollers capable of rolling the raceway portion of the outer ring, and a cage for holding these rollers,
The center of the inner diameter surface of one collar and the center of the inner diameter surface of the other collar are arranged eccentrically by a predetermined amount in the radial direction, and the diameter of the inner diameter of one collar is the diameter of the outer diameter of the cage And the diameter of the inner diameter surface of the other collar is set smaller than the diameter of the outer diameter surface of the cage, and the axial width of the cage is the axis between the axially inner end surfaces of both collars. It is formed smaller than the direction width,
One of the flanges and the cage has an overlapping region projected in the axial direction and overlapping each other in a predetermined region in the circumferential direction.   The roller bearing according to claim 1, wherein a lubricant holding space is provided between a raceway portion of the outer ring and an outer diameter surface of the cage. A method of manufacturing a roller bearing comprising an outer ring having flanges extending radially inward on both sides in the axial direction, a plurality of rollers capable of rolling the raceway portion of the outer ring, and a cage that holds these rollers. And
The center of the inner surface of one of the flanges is formed eccentrically by a predetermined amount in the radial direction with respect to the axis of the outer ring, and the diameter of the inner surface of one of the flanges is substantially equal to the diameter of the cage. Or form slightly larger,
A method for manufacturing a roller bearing, comprising: inserting a cage into an outer ring through an opening of one collar part, disposing the cage between the collar parts on both sides, and mounting the rollers in pockets of the cage.   One of the flanges is formed by punching after forming a metal plate into a cylindrical shape with one side open, and a method for manufacturing a roller bearing, characterized in that:

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