WO2013042703A1

WO2013042703A1 - Roller bearing

Info

Publication number: WO2013042703A1
Application number: PCT/JP2012/073992
Authority: WO
Inventors: 中川　勉; 雅西村; 真司大石
Original assignee: Ntn株式会社
Priority date: 2011-09-22
Filing date: 2012-09-20
Publication date: 2013-03-28

Abstract

According to the present invention, the strength of a pillar section (9) of a cage (7) may be improved, and the durability of a roller bearing may be improved by smooth circulation of a lubricant. A relief groove (16) which is dented in a circumferential direction is disposed at a wall surface of the pillar section (9) of a pocket (8) of a cage (7) which accommodates a roller (6), and the depth of the relief groove (16) of the pillar section (9) is made shallower toward an inner diameter side from an outer diameter side to improve the strength of the pillar section (9), smoothen the circulation of the lubricant from the inner diameter side to the outer diameter side, and prevent dust such as metal abrasion powder in the lubricant from staying in the pocket (8).

Description

Roller bearing

This 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 the inner peripheral surface, an inner member 25 having a cylindrical inner ring raceway 24 on the 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 retainer 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. is doing.

The roller bearing 21 configured in this way 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.

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 used as the lubricant oil. It rides in the flow and enters into 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 circulation of the lubricating oil deteriorates. Due to the accumulated dust, particularly metal wear powder such as iron powder. 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.

In addition, in a large reduction gear device used in construction machinery and the like, in consideration of heavy load conditions and mounting errors, the roller 26 has a straight center at the outer peripheral surface and a gentle diameter at both ends toward both ends. A thing with a crowning which consists of a crowning part crowned so that it may become small is used.

¡In the case of such a roller with crowning, the surface pressure applied to the straight portion increases, and the oil film is likely to break in the region of the straight portion.

As a countermeasure against such wear powder, Patent Document 2 discloses that a relief groove 36 for circulating foreign matter and wear powder is provided on the wall surface of the column portion 9 of the pocket 28.

JP-A-8-177869 JP 2001-41250 A

However, as in Patent Document 1, even if a blade is provided on the outer diameter side of the column 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 abrasion of the roller 26 due to accumulated dust, especially metal wear powder such as iron powder.

Further, as in Patent Document 2, when a relief groove 36 having a depth K recessed in the circumferential direction is provided on the wall surface of the column portion 9, as shown in FIG. 6, the width b of the column portion 9 on the outer diameter side is provided. There has been a problem that the width a of the column portion 9 on the inner diameter side becomes narrow and the strength of the column portion 9 becomes weak.

In view of this, the present invention is intended to improve the flow of the lubricating oil while extending the life of the roller bearing while ensuring the strength of the pillar portion of the cage, and to provide the cage guide surface with the inner diameter of the outer member. An object of the present invention is to prolong the life of the roller bearing by preventing the roller from being damaged by entrapment and retention of dust such as metal wear powder so that the lubricating oil flows sufficiently.

The present invention provides an outer member having a cylindrical outer ring raceway on the inner peripheral surface in order to improve the flow of the lubricating oil and to extend the life of the roller bearing while ensuring the strength of the pillar portion of the cage. An inner member having a cylindrical inner ring raceway on the outer peripheral surface, a plurality of rollers provided between the outer ring raceway and the inner ring raceway, and a pocket for accommodating and holding the rollers at predetermined intervals in the circumferential direction. The entire body having a cylindrical shape is composed of a pillar portion between pockets adjacent to each other in the circumferential direction, and a cage having annular portions on both sides in the axial direction of the pillar portion. In a roller bearing provided with a relief groove that is recessed in the direction, the depth of the relief groove of the column portion is reduced from the outer diameter side toward the inner diameter side.

That is, the width of the column portion in which the escape groove is provided is compared with the width b on the outer diameter side and the width a on the inner diameter side. The relationship b ≧ a is maintained at an angle of 0 ° or more.

Further, the present invention provides a roller bearing by preventing the roller from being damaged due to 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. In order to extend the service life of the outer member, 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 the outer ring raceway and the inner ring raceway It is composed of a plurality of rollers provided so as to be freely rollable and a cage that holds the rollers at a predetermined interval in the circumferential direction, and the cage is formed in a cylindrical shape with pockets for accommodating the rollers formed at a predetermined interval in the circumferential direction. In the roller bearing having a column portion between each pocket adjacent in the circumferential direction and an annular portion on both sides in the axial direction of the column portion, the outer diameter side dimension in the circumferential direction of the pocket is set to be larger than the inner diameter side dimension. Widened.

That is, in this 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 depth of the escape groove of the column portion is made shallower from the outer diameter side toward the inner diameter side, so that the width of the column portion on the inner diameter side is wide and the strength is high accordingly.
In addition, since the relief groove has a shape that widens from the inner diameter side toward the outer diameter side, the lubricating oil smoothly flows from the inner diameter side to the outer diameter side, and dust such as metal wear powder mixed in the lubricating oil is contained in the pocket. Even if it is used in a planetary gear reduction device that is difficult to stay in the metal and easily generates metal wear powder, it has a long life.

Further, in the roller bearing of the present invention, since the outer diameter side dimension in the circumferential direction of the pocket of the cage is wider than the inner diameter side dimension, 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 inner diameter of the nozzle 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. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. It is a top view which shows partially 2nd Embodiment of the roller bearing which concerns on this invention. It is sectional drawing of the II-II line | wire of FIG. FIG. 5 is a sectional view taken along line III-III in FIG. 4. It is a top view which shows the conventional roller bearing partially. It is sectional drawing of the VV line | wire 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 roller 6 of the embodiment shown in FIG. 1 to FIG. 3 is used with a crowning made of a crowning portion that is straight at the center of the outer peripheral surface and is crowned so that the diameter gradually decreases toward both ends on both sides. is doing.

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.

The wall surface of the column portion 9 of the pocket 8 is formed so as to penetrate the relief groove 16 recessed in the circumferential direction from the inner diameter side to the outer diameter side.

The depth K of the relief groove 16 of the column portion 9 is made shallower from the outer diameter side toward the inner diameter side as shown in FIG.

For this reason, the width of the column portion 9 in the portion where the escape groove 16 is provided is such that the surface of the column portion provided with the escape groove is the center line of the column portion when the width b on the outer diameter side is compared with the width a on the inner diameter side. As shown in FIG. 3 showing the embodiment of the present invention and FIG. 6 showing the conventional example, the relationship of b ≧ a is maintained at an angle of 0 ° or more with respect to the pillar of the present invention. The width b on the inner diameter side of the portion 9 is wider than the width b on the inner diameter side of the column portion 29 of the conventional example.

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 pillar portion 9 of the cage 7 is provided with an inner projection portion 11 and an outer projection portion 12 that prevent the rollers 6 from falling off on the inner diameter side and the outer diameter side on both sides in the axial direction.

Oil passages

13A and 13B extending inward and outward in the radial direction are provided at three locations in the axial intermediate portion and both axial ends of the column portion 9 except for the portion where the inner protrusion portion 11 and the outer protrusion portion 12 are formed. . Then, the flow of the lubricating oil and the amount of the lubricating oil in the roller bearing 1 are ensured by circulating the lubricating oil from the radially inner side to the outer side of the cage 7 by the centrifugal force through the oil passages 13A and 13B. is doing.

In the present invention, since the relief groove 16 is formed in the column portion 9, the lubricating oil smoothly flows through the relief groove 16, and the oil film breakage of the straight portion of the roller hardly occurs, and the lubricating oil in the pocket 8 Therefore, dust such as metal wear powder does not stay in the pocket 8.

In the embodiment shown in FIGS. 1 to 3, the inner ring raceway 4 and the inner diameter of the cage 7 are larger than the gap between the outer oil passages 14 formed between the outer ring raceway 2 and the outer diameter of the cage 7. A gap interval between the inner oil passages 15 formed therebetween is set large.

Thereby, the circulation of the lubricating oil from the inner oil passage 15 to the outer oil passage 14 increases, and the cooling effect by the lubricating oil is also improved.
Next, in the embodiment shown in FIGS. 4 to 6, when the outer diameter side dimension A in the circumferential direction of the pocket 8 and the inner diameter side dimension B are compared, as shown in FIGS. 4 and 6, A> B That is, the outer diameter side dimension A is made wider than the inner diameter side dimension B.

The axial position of the cage 7 is restricted by a washer 17 fitted to the inner member 5.

The column portion 9 of the cage 7 is provided with an outer diameter side projection portion 11 for preventing the roller 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. 5 from the oil hole 18, lubricating oil is supplied to the center in the axial direction 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 the planetary gear (outer member 3) in each reduction gear mechanism of the 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 track 3 Outer member 4 Inner ring track 5 Inner member 6 Roller 6a Straight part 6b Crowning part 7 Cage 8 Pocket 9 Column part 10 Ring part 11 Inner protrusion part 12 Outer protrusion part

13A Oil path

13B Oil Road 14 Outer oil passage 15 Inner oil passage 16 Relief groove 17 Washer 18 Oil hole

Claims

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 the whole having the pocket which accommodates and holds the roller at a predetermined interval in the circumferential direction is cylindrical, and is provided with a column part between each pocket adjacent in the circumferential direction, and an annular part on both sides in the axial direction of the column part. In the roller bearing, which has a relief groove recessed in the circumferential direction on the wall surface of the pocket pillar part, the depth of the relief groove of the pillar part is made shallower from the outer diameter side to the inner diameter side. Roller bearing.
When comparing the width b on the outer diameter side and the width a on the inner diameter side of the column portion of the portion provided with the relief groove, the surface of the column portion provided with the relief groove is 0 ° or more with respect to the center line of the column portion The roller bearing according to claim 1, wherein a relationship of b ≧ a is maintained at an angle of
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 the relationship of A> B always holds when the outer diameter side dimension of the pocket in the circumferential direction is A and the inner diameter side dimension is B.
The roller bearing according to claim 3 or 4, wherein an oil hole for supplying lubricating oil is formed in an inner member located on the inner diameter side of the cage in the axial center of the cage.
The gap interval of the inner oil passage formed between the inner ring raceway and the inner diameter of the cage is set larger than the gap interval of the outer oil passage formed between the outer ring raceway and the outer diameter of the cage. The roller bearing according to any one of claims 1 to 5.
The roller bearing according to any one of claims 1 to 6, wherein a material of the cage is a resin material.
The roller bearing according to any one of claims 1 to 7, wherein a material of the cage is an iron material.
The roller bearing according to claim 7, wherein the resin material is polyamide 66 or polyamide 46.
The roller bearing according to claim 9, wherein the resin material is polyetheretherketone or polyphenylene sulfide.
The roller bearing according to claim 9 or 10, 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 11.
The planetary gear reduction device according to claim 12, wherein the outer member is a planetary gear and the inner member is a support pin.