JP5889596B2 - 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.

  In particular, in a large reduction gear device used in a construction machine or the like, in consideration of heavy load conditions and mounting errors, the roller 26 has a straight portion 26a at the center of the outer peripheral surface and diameters at both ends toward both ends. The thing with the crowning which consists of the crowning part 26b which carried out the crowning process so that it may become small gradually is used.

  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.

  An inner protrusion 31 and an outer protrusion 32 that prevent the rollers 26 from falling off are provided on the inner diameter side and the outer diameter side of the pillar portion 29 of the cage 27, and the straight portion from the joint between the straight portion 26a and the crowning portion 26b. It is provided at a position close to the 26a 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 pockets 28 of 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 cage 27 via the oil passages 33A and 33B 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.

  However, an inner projection 31 and an outer projection 32 that prevent the roller 26 from falling off are connected to the pillars 29 that partition the pockets 28 of the roller bearing 21, and the straight portion 26 a and the crowning portion 26 b on the outer peripheral surface of the roller 26 are connected. It is provided at a position close to the straight portion 26a side from the eyes.

  Therefore, the gap between the straight portion 26a on the outer peripheral surface of the roller 26 and the inner protrusion 31 and the outer protrusion 32 of the column 9 is small, and the lubricant on the outer surface of the roller 26 causes the inner protrusion 31 and the outer protrusion. The dust is easily scraped off by the roller 32 and the dust tends to stay in the roller 26, the inner protrusion 31, and the outer protrusion 32.

  As a result, there is a problem that the rollers 26 in each pocket 28 wear with dust accumulated in the portions of the inner protrusion 31 and the outer protrusion 32, particularly metal wear powder such as iron powder, and wear at an early stage.

  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 groove 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, as described above, even if a groove is provided in the wall surface of the pocket 28, wear powder is caught in the inner projection portion 31 and the outer projection portion 32. There is a problem of damage.

  In view of this, the present invention makes it difficult for wear powder to bite at the inner and outer protrusions that prevent the roller from falling off, and the lubricating oil flows from the radially inner side to the outer side of the cage. At the same time, it is an object to extend the life of the roller bearing by preventing dust such as metal wear powder from staying in the inner protruding portion so that indentation and oil film breakage do not occur on the roller. It is.

  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. The whole is cylindrical and has a column part between each pocket adjacent in the circumferential direction, and an annular part on both sides in the axial direction of this column part, on the inner diameter side and the outer diameter side on both sides in the axial direction of the column part, In roller bearings with inner and outer protrusions that prevent the rollers from falling off, and where the roller outer peripheral surface consists of a central straight part and crowning parts on both sides, the inner and outer protrusions of the column part are From the joint between the straight part of the outer peripheral surface and the crowning part on both sides Characterized by providing the crowning portion.

  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. Is desirable.

  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, by providing the inner projecting portion and the outer projecting portion of the column portion that prevent the roller from falling off, on the crowning portion side from the joint between the straight portion of the roller outer peripheral surface and the crowning portions on both sides thereof, Since the gap between the roller outer peripheral surface and the inner and outer protrusions of the pillar portion is widened, the inner and outer protrusions do not scrape off the lubricant on the outer surface of the roller. Dust such as metal wear powder mixed in the lubricating oil does not stay in the protruding portion, and the lubricating oil flows smoothly through the gap between the roller and the pocket.

  Therefore, the rolling bearing of the present invention has a long life even when used in a planetary gear reduction device in which metal wear powder is likely to be generated because the indentation and oil film breakage hardly occur on the roller.

  Further, 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. By doing so, since the circulation of the lubricating oil from the inner oil passage to the outer oil passage increases, the cooling effect is also improved.

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 whose outer peripheral surface includes a central straight portion 6a and crowning portions 6b on both sides thereof 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.

  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 2.
The inner projection 11 and the outer projection 12 are provided at positions closer to the crowning portion 6b side than the joint between the straight portion 6a on the outer peripheral surface of the roller 6 and the crowning portions 6b on both sides thereof.

  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, the inner protrusion 11 and the outer protrusion 12 are provided at positions closer to the crowning portion 6b side than the joint between the straight portion 6a on the outer peripheral surface of the roller 6 and the crowning portions 6b on both sides thereof. The inner protrusion 11 and the outer protrusion 12 have a wide space between the outer peripheral surface of the inner protrusion 11 and the outer protrusion 12 so that the lubricating oil flows smoothly, and the inner protrusion 11 and the outer protrusion 12 scrape off the outer surface of the roller 6. Further, dust such as metal wear powder mixed in the lubricating oil does not stay in the inner protrusion 11 and the outer protrusion 12.

  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 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

Claims (8)

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 that holds the roller in the circumferential direction at a predetermined interval, and the cage is formed in a cylindrical shape with pockets for accommodating the rollers at a predetermined interval in the circumferential direction, and between the pockets adjacent in the circumferential direction. A column part and an annular part on both sides in the axial direction of the column part. In the roller bearing where the roller outer peripheral surface is composed of the central straight part and the crowning parts on both sides thereof, the inner projection part and the outer projection part of the column part are connected to the crowning part rather than the joint between the straight part and the crowning parts on both sides thereof. provided on the side, the outer diameter of the cage and the outer ring raceway Than the gap spacing of the outer oil path formed between the roller bearing, characterized in that setting the gap distance between the inner oil passage formed between the inner ring raceway and the cage inner diameter larger. The roller bearing according to claim 1 , wherein a material of the cage is a resin material. The roller bearing according to claim 1 , wherein a material of the cage is an iron material. The roller bearing according to claim 2 , wherein the resin material is polyamide 66 or polyamide 46. The roller bearing according to claim 2 , wherein the resin material is polyetheretherketone or polyphenylene sulfide. The roller bearing according to claim 4 or 5 , 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 6 . The planetary gear reduction device according to claim 7 , wherein the outer member is a planetary gear and the inner member is a support pin.

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