JP5735387B2 - Roller bearing - Google Patents

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

  By the way, if the flow of the lubricating oil in the pocket 28 is poor, dust such as metal wear powder contained in the lubrication oil is likely to stay in the inner protruding portion 31 and the outer protruding portion 32, and the metal wear powder removes the roller 26 from the roller 26. The surface is easily damaged.

  Further, in the case of a roller with a crowning, the surface pressure applied to the straight portion increases, and the oil film is likely to be cut off in the region of the straight portion.

  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 relief groove 36 for circulating foreign matter and abrasion powder is provided on the wall surface of the column portion 9 of the pocket 28.

JP 2001-41250 A

  However, when the relief groove 36 having a depth K recessed in the circumferential direction is provided on the wall surface of the column portion 9 as described above, the inner diameter is larger than the width b of the column portion 9 on the outer diameter side as shown in FIG. There was a problem that the width a of the column 9 on the side became narrow and the strength of the column 9 was weakened.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the life of a roller bearing by ensuring the flow of lubricating oil while securing the strength of a pillar portion of a cage.

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 able to roll between and a pocket for accommodating and holding the rollers at predetermined intervals in the circumferential direction. The inner protrusion and the outer protrusion are provided on the inner diameter side and the outer diameter side of the column portion of the pocket to prevent the rollers from falling off. In a roller bearing in which an oil passage extending radially inward and outward is provided in a portion excluding a portion where the protrusion and the outer protrusion are formed, and a relief groove recessed in the circumferential direction is provided on the wall surface of the pocket pillar. The depth of the relief groove is reduced from the outer diameter side to the inner diameter side. To.

  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.

  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.

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.

  As the roller 6, a roller with a crowning made of a crowning portion that is crowned so that the center of the outer peripheral surface is straight and the diameter of the both sides gradually decreases toward both ends is used.

  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.

  As shown in FIG. 3, 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.

  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.

  An inner protrusion 11 and an outer protrusion 12 that prevent the roller 6 from falling off are provided on the inner diameter side and the outer diameter side on both sides in the axial direction of the column portion 9 of the cage 7.

  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. 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 it is difficult for the oil film to break in the straight portion of the roller, 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 FIG. 1 to FIG. 3, the inner ring raceway 4 and the inner diameter of the cage 7 are larger than the gap interval of the outer oil passage 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.

  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 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

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 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. An inner projection and an outer projection are provided on the inner diameter side and outer diameter side of the pocket pillar portion to prevent the rollers from falling off, except for the portion where the inner projection portion and the outer projection portion are formed. An oil passage that extends inward and outward in the radial direction is provided in the part, and a relief groove that is recessed in the circumferential direction is provided in the wall surface of the pocket pillar part. The depth of the relief groove of the pillar part is increased from the outer diameter side toward the inner diameter side Roller bearings characterized by being shallow.   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   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 claim 1 or 2.   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 8, wherein the outer member is a planetary gear and the inner member is a support pin.

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