JP2013068283A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the service life of a roller bearing by providing a sufficient flow of lubricating oil to a guide surface of a retainer inside an outer member to thereby prevent damages on a roller due to biting and retention of dust such as metal abrasion powder.SOLUTION: The roller bearing 1 includes: the outer member 3 having a cylindrical outer ring raceway 2 on the inner circumferential surface; an inner member 5 having a cylindrical inner ring raceway 4 on the outer circumferential surface; a plurality of rollers 6 disposed so as to be capable of rolling between the outer ring raceway 2 and inner ring raceway 4; and the retainer 7 retaining the rollers 6 at predetermined intervals in the circumferential direction. The retainer 7 has a cylindrical shape as the whole while having pockets 8 for housing the rollers 6 formed at predetermined intervals in the circumferential direction, and includes a pillar section 9 each between circumferentially adjacent pockets 8. The outer diameter-side dimension A in the circumferential direction of the pocket 8 is larger than the inner diameter-side dimension B thereof.

Description

  The present invention relates to a roller bearing suitable for use in a planetary gear reduction device.

  As shown in FIGS. 4 to 6, the roller bearing 21 includes an outer member 23 having a cylindrical outer ring raceway 22 on an inner peripheral surface, an inner member 25 having a cylindrical inner ring raceway 24 on an outer peripheral surface, A plurality of rollers 26 are provided between the outer ring raceway 22 and the inner ring raceway 24 so as to roll freely.

  The roller 26 is rotatably held by a cage 27 that is formed in a cylindrical shape as a whole. The cage 27 has pockets 28 for accommodating the rollers 26 at a predetermined interval in the circumferential direction, a column portion 29 between the pockets 28 adjacent in the circumferential direction, and an annular portion 30 on both sides in the axial direction of the column portion 29. And.

  The pillar portion 29 of the cage 27 is provided with an inner protrusion portion 31 and an outer protrusion portion 32 that prevent the rollers 26 from falling off on the inner diameter side and the outer diameter side.

  For example, oil passages 33A and 33B extending inward and outward in the radial direction are provided at three locations on the axial intermediate portion and both axial ends of the column portion 29, except for a portion where the inner protrusion portion 31 and the outer protrusion portion 32 are formed. Provided. The lubricating oil is circulated from the radially inner side to the outer side of the cage 27 by the centrifugal force through the oil passages 33A and 33B, thereby ensuring the flow of the lubricating oil and the amount of the lubricating oil in the roller bearing 21. doing.

  The roller bearing 21 configured as described above is used, for example, when the planetary gear (outer member 23) in each reduction gear mechanism of the planetary gear reduction device is supported by a support pin (inner member 25).

  In such a case, the gap formed between the outer member 23 and the cage 27 forms the outer oil passage 34, and the gap formed between the inner member 25 and the cage 27 is the inner oil passage. The lubricating oil in the housing that forms the outer shape of the planetary gear speed reducer flows into the roller bearing 21 through the outer oil passage 34 and the inner oil passage 35. The inflowing lubricating oil flows from the radially inner side to the outer side of the retainer 27 through the oil passages 33A and 33B and is discharged into the housing by the centrifugal force generated when the planetary gear rotates. Thereby, the lubricity of the roller bearing 21 is improved.

  By the way, when the roller bearing 21 is used in the planetary gear reduction device as described above, dust such as wear powder and seal pieces of the seal member is generated from the meshing surface of the gear during operation, and this dust is lubricated. It rides in the oil flow and enters each pocket 28 of the roller bearing 21.

  Then, dust containing metal wear powder stays on the guide surface of the retainer 27 having the inner diameter of the outer member 23, and the flow of the lubricating oil deteriorates. There was a problem that the roller 26 was worn early.

  Particularly in recent years, gear reducer manufacturers have increased the surface roughness due to the omission of gear finishing due to cost reductions, and the projections of the roughness have fallen off due to gear meshing. There are many cases where this occurs. Therefore, it has become an important issue to prevent roller wear due to metal wear powder.

  As a countermeasure against such abrasion powder, Patent Document 1 discloses that a central portion of the column portion 29 of the cage 27 is bent toward the inner diameter side, and a blade that forms a flow of lubricating oil toward the outer diameter side is formed at the bent portion. Providing is disclosed.

JP-A-8-177869

  However, even if the blades are provided on the outer diameter side of the pillar portion 29 of the retainer 27, the lubricating oil does not sufficiently flow through the guide surface of the retainer 27 having the inner diameter of the outer member 23. It has been difficult to sufficiently prevent the roller 26 from being worn by metal wear powder such as iron powder.

  In view of this, the present invention provides a roller bearing that prevents the roller from being damaged by entrapment or retention of dust, such as metal wear powder, by allowing the lubricating oil to sufficiently flow to the cage guide surface having the inner diameter of the outer member. It is an object of the present invention to extend the service life of the material.

  In order to solve the above-described problems, the present invention provides an outer member having a cylindrical outer ring raceway on an inner peripheral surface, an inner member having a cylindrical inner ring raceway on an outer peripheral surface, and the outer ring raceway and the inner ring raceway. And a plurality of rollers provided so as to be freely rollable between the rollers and a retainer for retaining the rollers in the circumferential direction at a predetermined interval, and the retainer formed pockets for accommodating the rollers at a predetermined interval in the circumferential direction. In a roller bearing having a cylindrical shape as a whole and a column portion between each pocket adjacent in the circumferential direction and annular portions on both sides in the axial direction of the column portion, the outer diameter side dimension in the circumferential direction of the pocket It is wider than the side dimension.

  That is, in the present invention, when the outer diameter side dimension in the circumferential direction of the pocket is A and the inner diameter side dimension is B, the relationship of A> B is always established.

  By forming an oil hole for supplying lubricating oil to the inner member located on the inner diameter side of the cage, the flow of lubricating oil from the inner diameter side to the outer diameter side of the cage can be improved.

  The cage material is formed of a resin material or an iron material.

  As the resin material, polyamide 66, polyamide 46, polyetheretherketone, polyphenylene sulfide, or the like can be used, and the fiber may be reinforced with glass fiber.

  The roller bearing according to the present invention can be used in a planetary gear reduction device, in which case the outer member is used as a planetary gear and the inner member is used as a support pin.

  In the roller bearing of the present invention, the outer diameter side dimension in the circumferential direction of the pocket of the cage is wider than the inner diameter side dimension, so that the inner diameter of the inner member that is the guide surface of the cage from the inner diameter side of the cage The flow of the lubricating oil toward the smooth becomes smooth, and dust such as metal powder contained in the lubricating oil does not stay on the guide surface of the cage.

  Therefore, the rolling bearing according to the present invention has a long life even when used in a planetary gear reduction device in which indentation and oil film breakage are unlikely to occur on the roller and metal wear powder is easily generated.

It is a top view which shows partially one Embodiment of the roller bearing which concerns on this invention. It is sectional drawing of the II-II line of FIG. It is sectional drawing of the III-III line of FIG. It is a top view which shows the conventional roller bearing partially. It is sectional drawing of the VV line of FIG. It is sectional drawing of the VI-VI line of FIG.

An embodiment of the present invention will be described with reference to FIGS.
The roller bearing 1 includes an outer member 3 having a cylindrical outer ring raceway 2 on an inner peripheral surface, an inner member 5 having a cylindrical inner ring raceway 4 on an outer peripheral surface, and the outer ring raceway 2 and the inner ring raceway 4. It consists of a plurality of rollers 6 provided so as to be able to roll between them.

  The roller 6 is formed as a cylindrical body from a metal material or the like, is configured as a needle roller, a rod roller, or the like, and is held in a regular array by a cage 7 formed entirely in a cylindrical shape.

  The cage 7 has a rectangular pocket 8 that regularly accommodates the rollers 6 at predetermined intervals in the circumferential direction, and is formed by using a resin material such as injection molding. The cage 7 is formed so that the pocket 8 penetrates from the inner diameter side to the outer diameter side. Between the pockets 8 adjacent to each other in the circumferential direction, the ring portion 10 and the annular portions 10 on both sides of the column portion 9 in the axial direction. Is provided.

  If the outer diameter side dimension A in the circumferential direction of the pocket 8 is compared with the inner diameter side dimension B, the relationship of A> B is always established as shown in FIGS. 1 and 3, that is, the outer diameter side. The dimension A is wider than the inner diameter side dimension B.

  The cage 7 has its axial position regulated by a washer 13 fitted to the inner member 5.

  As the resin material for forming the cage 7, polyamide 66, polyamide 46, polyether ether ketone, polyphenylene sulfide, or the like can be used, and the fiber may be reinforced with glass fiber.

  The column portion 9 of the cage 7 is provided with outer diameter side protrusions 11 that prevent the rollers 6 from falling off on the outer diameter side on both sides in the axial direction.

  An oil hole 12 for supplying lubricating oil is formed in the support shaft which is the inner member 5 located on the inner diameter side of the cage 7. As indicated by the white arrow X in FIG. 2 from the oil hole 12, lubricating oil is supplied to the axial center of the cage 7, and the outer diameter side dimension A in the circumferential direction of the pocket 8 of the cage 7 is the inner diameter side dimension. Since the width is larger than B, the supplied lubricating oil is further stirred by centrifugal force from the radially inner side to the outer side of the cage 7. That is, a sufficient amount of oil is also supplied to the outer oil passage 14 to improve the lubricity of the roller bearing 1.

  The roller bearing 1 of the present invention is used, for example, when a planetary gear (outer member 3) in each reduction gear mechanism of a planetary gear reduction device is supported by a support pin (inner member 5).

  In such a case, the gap formed between the outer member 3 and the cage 7 forms the outer oil passage 14, and the gap formed between the inner member 5 and the cage 7 is the inner oil passage. The lubricating oil in the housing that forms the outer shape of the planetary gear speed reducer flows into the roller bearing 1 through the outer oil passage 14 and the inner oil passage 15. The inflowing lubricating oil flows from the radially inner side to the outer side of the cage 7 through the oil passages 13A and 13B and is discharged into the housing by the centrifugal force generated when the planetary gear rotates. Thereby, the lubricity of the roller bearing 1 is improved.

DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Outer ring raceway 3 Outer member 4 Inner ring raceway 5 Inner member 6 Roller 7 Cage 8 Pocket 9 Pillar part 10 Ring part 11 Outer protrusion part 12 Oil hole 13 Washer 14 Outer oil path 15 Inner oil path

Claims (10)

  An outer member having a cylindrical outer ring raceway on the inner peripheral surface, an inner member having a cylindrical inner ring raceway on the outer peripheral surface, and a plurality of rollers provided in a freely rollable manner between the outer ring raceway and the inner ring raceway And a cage for holding the rollers at predetermined intervals in the circumferential direction, and the cage is formed in a cylindrical shape with pockets for accommodating the rollers at predetermined intervals in the circumferential direction, and is adjacent to each other in the circumferential direction. A roller bearing having a column portion and annular portions on both sides in the axial direction of the column portion, wherein the outer diameter side dimension in the circumferential direction of the pocket is wider than the inner diameter side dimension. .   The roller bearing according to claim 1, wherein a relationship of A> B is always established, where A is an outer diameter side dimension in the circumferential direction of the pocket and B is an inner diameter side dimension.   3. The roller bearing according to claim 1, wherein an oil hole for supplying lubricating oil is formed in an inner member located on an inner diameter side of the cage at a center in an axial direction of the cage.   The roller bearing according to any one of claims 1 to 3, wherein a material of the cage is a resin material.   The roller bearing according to any one of claims 1 to 3, wherein a material of the cage is an iron material.   The roller bearing according to claim 4, wherein the resin material is polyamide 66 or polyamide 46.   The roller bearing according to claim 4, wherein the resin material is polyetheretherketone or polyphenylene sulfide.   The roller bearing according to claim 6 or 7, wherein the resin material is fiber reinforced with glass fiber.   A planetary gear reduction device using the roller bearing according to any one of claims 1 to 8.   The planetary gear reduction device according to claim 9, wherein the outer member is a planetary gear and the inner member is a support pin.

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