JP2013113351A - Retainer for thrust roller bearing and thrust roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer for a thrust roller bearing excellent in oil permeability and capable of obtaining the thrust roller bearing large in a load capacity.SOLUTION: Many pockets 42 storing rollers 30 are circumferentially formed at equal intervals on an annular retention plate 41 composed of a punching pressed article of a steel plate, a roller stopper member 44 is resin molded so as to surround a part of the side opposite in a circumferential direction of the circumferentially adjacent pockets 42, and a large gap is formed between opposite surfaces to track bases 10 and 20 by integration between the housing track base 10 and the shaft track base 20, thereby improving the oil permeability.

Description

  The present invention relates to a retainer for a thrust roller bearing used in an automobile transmission, a torque converter, an air conditioner compressor, and the like, and a thrust roller bearing using the retainer.

  In general, in a thrust roller bearing used for a transmission of an automobile, it is necessary to supply lubricating oil to adjacent components, and therefore, good oil permeability is required.

  In order to improve oil permeability, in the thrust roller bearing described in Patent Document 1, two holding plates are formed by bending a cylindrical portion facing in the same direction on each of the outer periphery and the inner periphery of the annular substrate portion. The inner and outer cylindrical parts are combined so as to be fitted into a hollow cage, and a plurality of pockets for accommodating rollers are formed in each of the two holding plates at equal intervals in the circumferential direction, and the lubricating oil flow direction One holding plate located on the upstream side is provided with a through-hole-like lubricating oil flow path at a portion removed from the pocket, and the lubricating oil is introduced into the cage from the flow path to improve oil permeability. I have to.

  Further, in the thrust roller bearing described in Patent Document 2, similarly to Patent Document 1, in a cage composed of two holding plates, a hole is formed in a portion excluding a pocket forming portion formed in each holding plate. Are formed at intervals in the circumferential direction, and the lubricating oil flowing into the cage from the hole formed in one holding plate is caused to flow out from the hole formed in the other holding plate to improve oil permeability. I try to figure it out.

  Further, in the thrust roller bearing described in Patent Document 3, as in the cage described in Patent Document 2, a hole is formed in each of the two holding plates forming the cage, A cut-and-raised piece is provided on the side edge of the hole formed in the holding plate, and the cut-and-raised piece is twisted, and the lubricating oil flowing into the cage is cut and raised and forced to flow by the piece. I try to improve.

Japanese Utility Model Publication No. 1-78722 Japanese Utility Model Publication No. 6-48183 Japanese Patent Laid-Open No. 8-200377

  By the way, in the thrust roller bearing cage composed of the two holding plates as described above, the rollers accommodated in the pocket can be held by the two holding plates, so that the rollers do not fall off, The thrust roller bearing is easily assembled and assembled to the device, but the cage formed by the combination of the two holding plates is hollow and has a large axial width dimension. When a thrust roller bearing is formed by incorporating it between the facing parts of the disc and the shaft washer, a large gap cannot be secured between the opposing parts of the washer, and a pocket is simply provided on the annular holding plate. Compared with the formed flat cage, the oil permeability is significantly inferior, and there is a problem that foreign matter tends to stay.

  On the other hand, in a flat cage in which a pocket is simply formed on an annular holding plate, foreign matter stays little and has excellent oil permeability, but in order to prevent the rollers contained in the pocket from falling off, The inner periphery needs to be cylindrical along the outer periphery of the roller. For this reason, the cage needs to be a resin molded product, and it is not possible to obtain a cage excellent in strength, and there is a disadvantage that a thrust roller bearing having a large load capacity cannot be obtained.

  An object of the present invention is to provide a thrust roller bearing retainer and a thrust roller bearing that are excellent in oil permeability and capable of obtaining a thrust roller bearing having a large load capacity.

  In order to solve the above-described problems, in the thrust roller bearing retainer according to the present invention, a large number of pockets for accommodating the rollers are formed at equal intervals in the circumferential direction in an annular retainer plate made of a stamped press-formed product of a steel plate, A roller retaining member is resin-molded so as to enclose at least a part of the side surface facing the pocket in the circumferential direction, and the roller is retained at both axial ends of the surface facing the pocket of the roller retaining member. The claw portion is provided.

  In the thrust roller bearing according to the present invention, a thrust roller bearing incorporating a plurality of rollers between the housing washer and the shaft washer and a retainer for retaining the roller. Such a thrust roller bearing retainer is employed.

  As described above, the cage built between the housing washer and the shaft washer has a configuration in which a pocket is formed on a retainer plate made of a press-formed product of a steel plate, so that the space between the facing portion of the washer and the retainer Thus, it is possible to form a thrust roller bearing having excellent oil permeability with less foreign matter retention.

  Further, since the cage is made of a steel plate press-molded product, it is possible to form a thrust roller bearing that is superior in strength and has a large load capacity as compared with a cage made of resin.

  Furthermore, the roller contained in the pocket falls off by resin-molding a roller retaining member having a roller retaining pawl so as to wrap at least part of the side surfaces facing in the circumferential direction of the pocket. The thrust roller bearing can be easily assembled. Further, the thrust roller bearing can be easily assembled to the apparatus.

  Here, a cylindrical portion is formed on the outer periphery of the housing washer, and a holding claw that can be engaged with the outer peripheral portion of one side surface of the cage is provided at the opening end of the cylindrical portion, while on the inner periphery of the axial washer When a cylindrical portion to be fitted inside the cage is formed, and a holding claw that can be engaged with the inner peripheral portion of the other side surface of the cage is provided at the opening end of the cylindrical portion, the washer and the cage In addition, the roller and the roller can be integrated into a three-piece configuration and can not be separated in the axial direction, and the thrust roller bearing can be more easily assembled to the apparatus.

  The roller retaining member may be a rectangular ring that wraps around the central portion of the length of the cage formed in the radial direction between adjacent pockets, or may be provided on the side surface facing in the circumferential direction of the pocket. It may have a U-shape that wraps around the central portion.

  Further, it may be a rectangular frame shape along the four inner peripheral sides of the pocket, or a planar U shape along the inner peripheral side of the cage inner diameter side and both inner side surfaces of the pocket inner periphery. It may be what was done.

  In the adoption of a rectangular ring-shaped roller retaining member, oil permeable properties are formed by forming a radial groove from the inner side surface to the outer side surface in the radial direction of the cage on each of the surfaces of a pair of band plates extending between adjacent pockets. Can be improved.

  In the case of adopting a rectangular frame-shaped or U-shaped roller retaining member, a fitting groove that fits the inner peripheral edge of the pocket is formed on the outer periphery of the roller retaining member to stabilize the mounting. Like that.

  In the thrust roller bearing retainer according to the present invention, when the thickness of the annular holding plate is t and the outer diameter of the roller is D, the ratio t / D of the thickness t to the outer diameter D exceeds 20%. By making it less than 50%, a higher strength cage can be obtained.

  In the thrust roller bearing retainer according to the present invention, as described above, the raceway is formed by punching a steel plate in which a large number of pockets for accommodating the rollers are formed at equal intervals in the circumferential direction. Since a large gap can be formed between the portions facing the disc, a thrust roller bearing having excellent oil permeability and less stagnation of foreign matter can be formed.

  Further, the roller retaining member having a roller retaining pawl portion is formed by resin molding so as to wrap at least a part of the side surfaces facing each other in the circumferential direction of the pocket, thereby preventing the roller from falling out of the pocket. The thrust roller bearing can be easily assembled. Further, since the roller rotates in contact with a roller retaining member made of resin, it is possible to obtain a thrust roller bearing with excellent durability by suppressing wear of the roller rolling surface.

Cross section of thrust roller bearing according to the present invention The top view which shows a part of holder | retainer of FIG. Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. 2 is a perspective view of the cage shown in FIG. The top view which shows the other example of the holder | retainer based on this invention Sectional drawing along the VII-VII line of FIG. Sectional drawing which shows the further another example of the holder | retainer which concerns on this invention The top view which shows the further another example of the holder | retainer which concerns on this invention Sectional view along line XX in FIG. Sectional view along line XI-XI in FIG. The top view which shows the further another example of the holder | retainer which concerns on this invention Sectional view along line XIII-XIII in FIG. Sectional view along line XIV-XIV in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the thrust roller bearing according to the present invention includes a housing washer 10, a shaft washer 20, a roller 30 incorporated between both washer 10 and 20, and a retainer for holding the roller 30. And the container 40.

  As shown in FIG. 2 to FIG. 5, the retainer 40 is formed by a stamped press-formed product of a steel plate in which a large number of pockets 42 are formed in an annular holding plate 41 at equal intervals in the circumferential direction. Rollers 30 are accommodated inside. Further, a pillar portion 43 is formed between pockets 42 adjacent to each other in the circumferential direction, and a rectangular ring-shaped roller is provided so as to wrap around the pillar portion 43 at the central portion of the length in the cage radial direction of each pillar portion 43. The retaining member 44 is resin-molded.

  The retainer 40 is heat-treated after press molding to increase its hardness. As the heat treatment, carburizing and quenching or carbonitriding can be employed, and the roller retaining member 44 is resin-molded after the heat treatment.

  Claw portions 45 are formed at both end portions in the cage axial direction on the side surface of the roller retaining member 44 facing the pocket 42, and the rollers 30 are retained by the claw portions 45.

  Here, when the steel plate as the material for forming the holding plate 41 is thin, the pillar portion 43 is easily deformed by the pressure from the roller 30 that revolves while rotating, and the cage 40 having excellent strength is obtained. I can't. Therefore, in the embodiment, as shown in FIG. 3, when the thickness of the steel plate as the material for forming the holding plate 41 is t and the outer diameter of the roller 30 is D, the steel plate with respect to the outer diameter D of the roller 30. The ratio t / D of the thickness t is more than 20% and less than 50%.

  As shown in FIG. 1, a cylindrical portion 11 that covers the outer peripheral portion of the cage 40 is formed on the outer periphery of the housing washer 10, and one side outer peripheral portion of the cage 40 and the axial direction are formed at the opening end of the cylindrical portion 11. The holding claws 12 that face each other are formed, and the housing washer 10 and the retainer 40 are not separated in the axial direction by the engagement of the retainer claws 12 and the retainer 40.

  On the other hand, a cylindrical portion 21 fitted inside the retainer 40 is formed on the inner periphery of the shaft washer 20, and the opening end of the cylindrical portion 21 is opposed to the inner peripheral portion of the other side surface of the retainer in the axial direction. A holding claw 22 is formed, and the shaft washer 20 and the cage 40 are not separated in the axial direction by the engagement of the holding claw 22 and the cage 40.

  As shown in the embodiment of FIGS. 2 to 5, the retainer 40 is a press-formed product of a steel plate in which a plurality of pockets 42 are formed on an annular retainer plate 41, so that each of the pockets 42 of the retainer 41 is provided. In the assembled state of the thrust roller bearing that houses the roller 30 and is assembled between the housing washer 10 and the shaft washer 20, as shown in FIG. A gap can be formed, and a thrust roller bearing with excellent oil permeability and less stagnation of foreign matter can be obtained.

  Further, the roller 30 is removed from the pocket 42 by resin-molding the roller retaining member 44 having the roller retaining pawl 45 so as to wrap at least part of the side surfaces facing the pocket 42 in the circumferential direction. Can be prevented.

  For this reason, the housing washer 10 and the axial washer 20 are overlapped on both sides in the axial direction of the cage 40 with the roller 30 incorporated in the pocket 42, and the cylindrical portion 11 of the housing washer 10 is placed outside the retainer 40. The holding claw 12 is fitted to the outer peripheral portion of one side surface of the cage 40 in the axial direction, and the cylindrical portion 21 of the shaft washer 20 is fitted inside the cage 40 to hold the holding claw 22. The thrust roller bearing can be assembled very easily by making the inner surface of the cage 40 face the inner peripheral portion of the cage 40 in the axial direction.

  In the assembled state of the thrust roller bearing as described above, each of the holding claws 12 and 22 is opposed to the cage 40 in the axial direction, and the housing washer 10, the shaft washer 20, and the roller are engaged with the cage 40. Since 30 and the retainer 40 are integrated in three positions, a thrust roller bearing can be easily assembled to the apparatus.

  Further, in the rotational state of the thrust roller bearing, the roller 30 is guided to contact with the roller retaining member 44 made of resin and is held in a non-contact state with the inner periphery of the pocket 42. Wears extremely little, and a thrust roller bearing with excellent durability can be obtained.

  6 to 14 show other examples of the roller retaining member 44. In the roller retaining member 44 shown in FIGS. 6 and 7, a radial groove 46 extending from the inner side surface to the outer side surface in the cage radial direction is formed on each surface of the pair of band plate portions 44a extending between the adjacent pockets 42. This is different from the roller retaining member 44 shown in FIGS. 2 to 5. For this reason, the same parts as those in FIGS.

  As shown in FIGS. 6 and 7, when the radial groove 46 is formed on the surface of the pair of band plate portions 44 a extending between the adjacent pockets 42 of the roller retaining member 44, the lubricating oil flows along the radial groove 46. Since it circulates, it is possible to suppress stagnation of foreign matters and further improve oil permeability.

  In the roller retaining member 44 shown in FIG. 8, a roller is formed on each of a pair of side surfaces opposed in the circumferential direction of the plurality of pockets 42 as a U-shape that wraps around the central portion of the side surfaces opposed in the circumferential direction of the pocket 42. The retaining member 44 is resin-molded, and roller retaining claws 45 are provided at both axial ends of the surface of the retaining member 44 facing the pocket 42.

  As described above, between the pair of roller retaining members 44 provided in the column portion 43 between the adjacent pockets 42 by resin-molding the roller retaining members 44 on the pair of side surfaces opposed in the circumferential direction of the pocket 42. Moreover, since the radial groove 47 having the front and back surfaces of the pillar portion 43 as the bottom is formed, a thrust roller bearing with less oil retention and better oil permeability can be formed.

  The roller retaining member 44 shown in FIG. 9 to FIG. 11 has a rectangular frame shape along the four inner peripheral sides of the pocket 42, and roller extraction is performed on each of the side surfaces facing the circumferential direction of the rectangular frame roller retaining member 44. A locking claw portion 45 is provided, a fitting groove 48 is formed on the outer periphery of the roller retaining member 44, and the inner peripheral edge portion of the pocket 42 is fitted into the fitting groove 48 to stabilize the mounting. ing.

  As described above, by forming the roller retaining member 44 into a square frame shape covering the four inner peripheral sides of the pocket 42, it is possible to completely prevent the roller 30 from metal touching the inner periphery of the pocket 42. Further, it is possible to more effectively prevent the roller rolling surface and the end surface from being worn.

  Further, since the radial groove 47 with the front and back surfaces of the column part 43 as the bottom is formed between the adjacent roller retaining members 44, a thrust roller bearing with less foreign matter retention and better oil permeability is formed. can do.

  In the roller retaining member 44 shown in FIG. 12 to FIG. 14, the inner surface of the pocket 42 is formed into a U-shaped flat surface along the inner end of the cage and the three inner peripheral sides of both sides. A roller claw 45 is provided on each of the circumferentially opposed side surfaces of the stopper member 44, a fitting groove 49 is formed on the outer circumference of the roller stopper member 44, and the inside of the pocket 42 is formed in the fitting groove 49. The periphery is fitted to stabilize the mounting.

  The roller retaining member 44 can prevent drilling wear on the roller end surface and the end surface on the outer periphery of the cage in the high-speed rotation region. As with the roller retaining member 44 shown in FIGS. A thrust roller bearing with less stagnation and better oil permeability can be formed.

DESCRIPTION OF SYMBOLS 10 Housing washer 11 Cylindrical part 12 Retaining claw 20 Axis washer 21 Cylindrical part 22 Retaining claw 30 Roller 40 Retainer 41 Retaining plate 42 Pocket 43 Pillar part 44 Roller retaining member 44a Band plate part 45 Claw part 46 Radial groove 47 Radial groove 48 Fitting groove 49 Fitting groove

Claims (9)

  A large number of pockets for accommodating rollers are formed at equal intervals in the circumferential direction on an annular holding plate made of a steel sheet stamping press-molded product, and at least a part of the side surfaces facing each other in the circumferential direction of the pockets is wrapped around to prevent the rollers from being removed. A thrust roller bearing retainer in which a member is resin-molded, and claw portions are provided at both end portions in the axial direction of the surface of the roller retaining member facing the pocket.   The thrust roller bearing retainer according to claim 1, wherein the roller retaining member is formed in a rectangular ring shape that wraps around a central portion of the length of the retainer in the radial direction of a pillar portion formed between adjacent pockets.   The thrust according to claim 2, wherein a radial groove extending from an inner side surface to an outer side surface in the radial direction of the cage is formed on each surface of a pair of strip plates extending between adjacent pockets of the roller-shaped retaining member in the form of a square ring. Roller bearing cage.   2. The thrust roller bearing retainer according to claim 1, wherein the roller retaining member is formed in a U-shape that wraps around a central portion of side surfaces opposed in the circumferential direction of the pocket.   The roller retaining member is formed in a square frame shape along the four inner peripheral sides of the pocket, and a fitting groove is formed on the outer periphery of the square frame roller retaining member to fit the inner peripheral edge of the pocket. Item 5. A thrust roller bearing retainer according to item 1.   The roller retaining member has a U-shaped flat surface along the inner peripheral side of the pocket inner peripheral side and the inner peripheral three sides of the both sides, and the inside of the pocket on the outer periphery of the U-shaped roller retaining member. The cage for a thrust roller bearing according to claim 1, wherein a fitting groove into which the peripheral edge is fitted is formed.   The ratio t / D of the thickness t to the outer diameter D is more than 20% and less than 50%, where t is the thickness of the annular holding plate and D is the outer diameter of the roller. The thrust roller bearing retainer according to any one of the above. In a thrust roller bearing incorporating a plurality of rollers between the housing washer and the shaft washer and a cage for holding the roller,
A thrust roller bearing comprising the retainer according to any one of claims 1 to 7.   The housing washer has a cylindrical portion covering the outer peripheral portion of the cage on the outer periphery, and a holding claw that can be engaged with the outer periphery of one side surface of the cage is formed at the open end of the cylindrical portion, A shaft washer has a cylindrical portion fitted on the inner side of the cage on the inner periphery, and a holding claw that can be engaged with the inner peripheral portion of the other side surface of the cage at the opening end of the cylindrical portion. The thrust roller bearing according to claim 8 formed.

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