JP2006144823A - Thrust roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust roller bearing capable of effectively reducing or absorbing vibration. <P>SOLUTION: This thrust roller bearing 10 comprises a race 12, a plurality of rollers 14 disposed on the raceway surface of the race, and a retainer 16 holding the plurality of rollers which are integrally assembled therein. The race 12 comprises a first raceway member 12a formed in an approximately L-shape in cross section by an annular part 12a1 and a flange part 12a2 rising from the outer diameter side end part of the annular part and an annular second raceway member 12b assembled in the annular part of the first raceway member. These both raceway members are formed by press working and assembled in the form of a race set, and at least one of the raceway members is formed of a damping member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thrust roller bearing.

In recent years, automobiles have been required to have quietness and low vibration as important product values. Each unit used in automobiles requires low noise and low vibration, and transmissions are an exception. Absent. In order to reduce the vibration of the transmission, countermeasures with bearings that support the parts are effective. Particularly with so-called stepped automatic transmissions, countermeasures with thrust roller bearings that are often used between parts are effective. It is particularly effective. Although it is not a thrust roller bearing, a rolling bearing using a damping material has already been proposed to attenuate bearing vibration (see Patent Document 1). In this rolling bearing, a damping cover made of a damping material is integrally fixed to the outer surface of at least one of the inner and outer rings by tightening. However, in this rolling bearing, since the damping cover is separate from the bearing ring, the number of assembly parts to the bearing increases, and the assembly takes time and cost. In addition, the thrust roller bearing is characterized by having a high load bearing capacity with a small cross-sectional height and a small axial width (assembly width). It was difficult to apply to roller bearings.
JP 2004-108539 A

  Therefore, the problem to be solved by the present invention is that the installation height of the damping material can be secured while maintaining the low sectional height which is a feature of the thrust roller bearing, and the damping performance of the damping material can be sufficiently exhibited. None, to provide a thrust roller bearing that can be incorporated into an automatic transmission or the like to contribute to lower noise.

  A thrust roller bearing according to the present invention is a thrust roller bearing in which a bearing ring, a plurality of rollers disposed on a raceway surface of the bearing ring, and a cage that holds the plurality of rollers are integrally incorporated. A first track member having a substantially L-shaped cross section by an annular portion and a flange portion rising from the outer diameter side end of the annular portion toward the track surface side, and an annular second track member incorporated in the annular portion of the first track member The both raceway members are assembled as a raceway ring set, and at least one of them is constituted by a damping member. It is preferable that both the race members are molded by press working because the molding cost can be reduced.

The damping member is a member made of a damping material. Damping means that vibration energy on the surface of the solid is converted into heat energy to reduce vibration on the surface of the solid, which is different from vibration prevention. Anti-vibration means to reduce the vibration transmissibility between the vibration source and the vibration source, and means to block the vibration. Further, the vibration damping can reduce not only the vibration of the solid surface but also the solid sound radiated from the solid surface. In particular, it is effective in reducing vibration near the resonance point of the vibration surface. As a vibration damping material in the present invention, a steel material is used as a base material, and a viscoelastic material such as a resin system, a rubber system, a metal system, etc. A material having both characteristics of the above material) is bonded. Metallic viscoelastic materials include graphite cast iron, Mn-Cu based damping alloy, Ni-Ti based damping alloy, Fe-Al based damping alloy, Al-Zn based damping alloy, duralumin based damping alloy Etc. Mn-Cu-based damping alloys are excellent not only in damping properties but also in formability, workability, non-magnetism, etc., Fe-Al-based damping alloys are excellent in high-temperature damping properties, and resin-based materials include fluorine. There are silicon, silicon, urethane, ester, amide and the like. In the present invention, an alloy-type damping material having a loss coefficient (also referred to as a damping coefficient, the larger the coefficient is, the greater the damping effect) is preferably 10 × 10 ⁻³ or more, and particularly Fe—Al-based damping. A vibration alloy is preferred. Structural carbon steel, stainless steel, and the like have a loss factor of 10 × 10 ⁻³ or less, and are difficult to use as a vibration damping material in the present invention. The damping performance of the Fe-Al damping alloy is about 7 to 15 times that of structural carbon steel. Since the Fe-Al damping alloy has the same strength and workability as a steel plate, it can be pressed into a plate shape, a rod shape, or a flat shape. Furthermore, weldability is equivalent to stainless steel, and specific gravity is lighter than iron. Furthermore, the vibration damping performance does not decrease up to a temperature of 300 ° C., and the oxidation resistance is as good as stainless steel. When classifying damping alloys by their damping effects, they are dislocation-type damping alloys that absorb vibrations by the movement of high-density dislocations in metal crystals, and twins that use the damping action by the motion of twin crystals formed by martensitic transformation. Crystal-type damping alloys and ferromagnetic-type damping alloys that absorb vibration energy at the domain wall (domain boundary). Dislocation type damping alloys include Mg (magnesium) and Mg-Zr (zirconium) alloys. Examples of twin type damping alloys include Mn-Cu (manganese-copper) and shape memory alloys Ni-Ti (nickel-titanium) alloys. As a ferromagnetic damping alloy, there is a 12% Cr-3% Al silent alloy.

  The damping alloy can be formed by a known metal working process or a combination thereof for casting, hot forging, hot rolling, cold forging, cold rolling, pressing, cutting, or the like. It is preferable to perform heat treatment after these moldings.

  According to the present invention, both the race members have a race ring set structure that can be formed by press working that can be manufactured at low cost, and at least one of the first race member or the second race member is made of a damping material. Therefore, it is incorporated into an automatic transmission and so on, and performs vibration damping such as absorption of vibrations. Therefore, it can contribute to low noise during the shifting operation of the automatic transmission and can be easily handled as one track ring. The number of parts can be reduced by the amount that can be used and a washer is unnecessary, so that the labor and cost for assembly can be reduced. In addition, the low cross-sectional height that is characteristic of thrust roller bearings is not impaired, so there is no risk of running out of space when vibration damping materials are separately installed, and because the bearing ring is configured, the bearing interior Can occupy a wide area, and can exhibit the effect of sufficiently exhibiting damping performance, etc., and it is easy to apply damping material to thrust roller bearings that were difficult to apply in the past Became possible.

  Preferably, the second race member constitutes the raceway surface side of the raceway ring and is constituted by a damping member, and the annular portion of the first raceway member constitutes the back side of the raceway ring. In addition, the second track member is mounted and assembled on the annular portion. According to this assembly, since the outer peripheral surface of the damping member constitutes the raceway surface of the roller, the vibration of each component is reduced compared to the case where the raceway surface of the normal race ring and the rolling surface directly roll. Transmission can be effectively attenuated or blocked, and vibrations can be absorbed.

  More preferably, the second race member constitutes a raceway surface side of the raceway, and the first raceway member has an annular portion constituting a back side of the raceway, and the second raceway is disposed on the annular portion. The member is mounted and assembled. According to this configuration, since the first race member covers the outer surfaces of the cage and the rollers, noise generated from the entire bearing is less likely to be generated outside, and if a large number of the thrust roller bearings are incorporated into the automatic transmission, Helps reduce noise in automatic transmissions.

  More preferably, the second race member constitutes the back side of the race ring, and the first race member has an annular portion constituting the race face side of the race ring, and the second race member is disposed on the back side of the annular portion. That is, the two track members are assembled.

  More preferably, the first track member includes an inner diameter side flange portion whose annular portion constitutes a raceway surface side of the bearing ring and which falls on the inner diameter side end portion of the ring portion on the back side. A second race member is assembled to the back surface of the annular portion, and the second race member constitutes the back side of the race ring, and its inner diameter side end abuts the side surface of the inner diameter side flange portion in the radial direction. It is positioned.

  In the present invention, there are two raceways, and the present invention can be applied to at least one raceway.

  In the present invention, the damping material may be a single layer made of the same damping material, but the loss factor can be finely adjusted by using a multilayered structure in which different damping materials are stacked. May be.

  In the present invention, when the second race member is interposed between the annular portion of the first race member, the second race member is separated without press-fitting or bonding the annular portion of the first race member. You can just superimpose as much as possible. When the second race member is assembled to the back surface of the annular portion of the first race member, the second race member may be bonded to the annular portion of the first race member with light press fitting or an adhesive.

  In the present invention, the thickness of each of the ring-shaped portion of the first track member and the second track member can be reduced to be approximately the same as the thickness of a normal track ring by superimposing the thicknesses of the ring portion and the second track member.

  In the present invention, when the second race member is on the raceway surface side of the race, the damping material of the second race member is preferably a metal system. When the second race member is on the back side of the race, the damping material of the second race member is not necessarily limited to a metal system. When the annular portion of the first track member is on the track surface side of the track ring, the damping material of the first track member is preferably a metal system. When the annular portion of the first race member is the back side of the race, the damping material of the first race member is not necessarily limited to a metal system.

  According to the present invention, vibration can be effectively suppressed without impairing the characteristics of the thrust roller bearing.

  Hereinafter, a thrust roller bearing according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
1 to 3 show a thrust roller bearing according to Embodiment 1 of the present invention, FIG. 1 is an exploded perspective view of the thrust roller bearing, FIG. 2 is an assembled perspective view of the thrust roller bearing, and FIG. It is a fragmentary sectional view of a thrust roller bearing. The thrust roller bearing according to the first embodiment will be described with reference to these drawings. The thrust roller bearing 10 shown in these drawings includes an annular race ring 12, and the race ring 12 includes a plurality of rollers 14. And a cage 16 for holding these rollers 14. The roller 14 is a needle roller, a cylindrical roller or the like.

  The raceway ring 12 is composed of two first and second raceway members 12a and 12b which are formed by press working and overlapped with each other in the axial direction.

  The first track member 12a is formed of various steel plates such as SUS, SUJ, SK, and constitutes the back side of the track ring 12. From the annular portion 12a1 and the outer diameter side end portion of the annular portion 12a1 The outer diameter side flange portion 12a2 that rises in an annular shape has a substantially L-shaped cross section. The outer peripheral edge of the outer diameter side flange portion 12a2 of the first raceway member 12a is provided with convex portions 12a3 which are recessed or bent by caulking or the like radially inward at several points in the circumferential direction. Yes.

  The second track member 12b has an outer diameter substantially corresponding to the inner diameter of the outer flange portion 12a2 by a damping member made of a damping steel plate, a damping alloy or the like, preferably a damping member made of an Fe-Al based damping alloy. Is formed on the outer peripheral surface of the annular portion 12a1 of the first track member 12a. The second track member 12b includes concave portions 12b1 on the radially inner side at several locations in the circumferential direction on the outer peripheral edge thereof. In assembling the second track member 12b on the annular portion 12a1 of the first track member 12a, the position of the concave portion 12b1 of the second track member 12b and the position of the convex portion 12a3 of the outward flange portion 12a2 of the first track member 12a are set in the vertical direction. Align with. Next, after the second track member 12b is overlaid on the annular portion 12a1 of the first track member 12a in this alignment state, either the first track member 12a or the second track member 12b is slightly rotated, The convex portion 12a3 and the concave portion 12b1 are displaced in the circumferential direction. As a result, the second race member 12b is assembled in a race ring set (assembly) state that can be handled as a single race ring that is not separated from the first race member 12a.

  Both raceway members 12a and 12b are formed by press working, and a second raceway member 12b is formed into a raceway ring set in a state where it is superimposed on the raceway side annular surface of the annular portion 12a1 of the first raceway member 12a. Has been placed. As for the damping member which comprises the 2nd track member 12b, the track surface side annular surface comprises the track surface 12b2 of the roller 14. FIG. Since both the track members 12a and 12b are formed by pressing, the processing cost is low. Both the race members 12a and 12b constitute one part as a race ring set at the time of assembly, and the race ring 12 has a race ring configuration having vibration damping performance without increasing the number of parts of the thrust roller bearing. ing. In addition, since the second race member 12b has a raceway function having a raceway surface at the same time as the damping function, compared to the case where the damping material is configured separately from the raceway ring 12, It is not necessary to provide an installation space separately from the raceway ring 12, which can contribute to space saving. Furthermore, since the bearing ring 12 itself has a damping function as compared with the case where a damping material is separately arranged, the weight can contribute to weight reduction as compared with the case where the damping material is separately arranged.

  The rollers 14 are arranged radially on the raceway surface 12b2 of the second raceway member 12b with respect to the bearing center. The cage 16 has an annular shape with pockets 16a radially, and holds the rollers 14 in each pocket 16a. The retainer 16 is prevented from being detached from the first track member 12a by the outer peripheral edge portion 16b engaging with the convex portion 12a3 of the outward flange portion 12a2 of the first track member 12a.

  With the above configuration, in the thrust roller bearing 10 according to the first embodiment, the three components of the race ring 12, the plurality of rollers 14, and the cage 16 are integrally assembled, and the second race member of the race ring 12 is also assembled. Since 12b is composed of a damping material, when incorporated between parts of an automatic transmission, vibrations generated between the parts are suppressed, resulting in the quietness of an automobile equipped with the automatic transmission. Can contribute greatly.

(Embodiment 2)
The thrust roller bearing according to the second embodiment of the present invention will be described with reference to FIG. 4. In the thrust roller bearing 10 according to the second embodiment, the second race member 12b (the raceway surface side of the raceway ring 12 is configured). Is arranged on the outer peripheral surface of the annular portion of the first race member 12a (which constitutes the back side of the race ring 12) 12a1 and the raceway side annular surface constitutes the raceway surface 12b2 of the roller 14. The entire first track member 12a is constituted by a vibration damping member.

  In the thrust roller bearing of the second embodiment, the second race member 12b is made of a steel plate, and the entire first race member 12a is made of the same damping material as that of the first embodiment. When incorporated between parts, the vibration generated between the parts is suppressed, and as a result, the cage 16 and the rollers 14 can be greatly contributed to the quietness of an automobile equipped with the automatic transmission. Is covered with the first raceway member 12a made of a vibration damping material, so that noise generated from the bearing can be confined and suppressed, so that it greatly contributes to the quietness of an automobile incorporating the bearing. be able to.

(Embodiment 3)
The thrust roller bearing according to the third embodiment of the present invention will be described with reference to FIG. 5. In the thrust roller bearing 10 according to the third embodiment, the first race member 12a is made of a steel plate, and the second race member 12b. (Which constitutes the back side of the race 12) is made of the same damping material as in the first embodiment, and the second race member 12b is an annular portion 12a1 of the first race member 12a (the race side of the race 12). The raceway side annular surface 12a5 of the annular portion 12a1 of the first raceway member 12a constitutes the raceway surface of the roller 14.

  Also in the thrust roller bearing 10 of the third embodiment, since the entire second raceway member 12b is made of a vibration damping material, when it is incorporated between the parts of the automatic transmission, vibration generated between the parts is generated. As a result of vibration suppression, it is possible to greatly contribute to the quietness of an automobile equipped with the automatic transmission.

(Embodiment 4)
The thrust roller bearing according to the fourth embodiment of the present invention will be described with reference to FIG. 6. In the thrust roller bearing 10 according to the fourth embodiment, the first race member 12a is made of a steel plate, and the second race member 12b. (Which constitutes the back side of the race 12) is made of the same damping material as in the first embodiment, and the first race member 12a is the annular portion 12a1 of the second race member 12b (the race face side of the race 12). The second raceway member 12b is positioned in the radial direction by abutting against the inner side surface of the inner diameter side flange portion 12a6. .

  In the thrust roller bearing 10 according to the fourth embodiment, since the entire second raceway member 12b is made of a damping material, when it is incorporated between the parts of the automatic transmission, vibration generated between the parts is suppressed. As a result, the second track member 12b is positioned by the inward flange portion 12a5 of the first track member 12a in addition to being able to greatly contribute to the quietness of the automobile equipped with the automatic transmission. Easy to assemble.

  The present invention can be implemented with various modifications other than the above-described embodiments within the scope described in the claims.

It is a perspective view shown in the state which decomposed | disassembled the thrust roller bearing which concerns on Embodiment 1 of this invention. It is a perspective view shown in the state where the thrust roller bearing of Embodiment 1 was assembled. It is the sectional view on the AA line of FIG. It is sectional drawing of the thrust roller bearing which concerns on Embodiment 2 of this invention. It is sectional drawing of the thrust roller bearing which concerns on Embodiment 3 of this invention. It is sectional drawing of the thrust roller bearing which concerns on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thrust roller bearing 12 Raceway ring 12a 1st track member 12b 2nd track member 14 Roller 16 Cage

Claims (4)

  In a thrust roller bearing in which a bearing ring, a plurality of rollers disposed on a raceway surface of the bearing ring, and a cage that holds the plurality of rollers are integrally incorporated, the bearing ring includes an annular portion and an outer portion of the annular portion. A first race member having a substantially L-shaped cross section by an outer diameter side flange portion rising from the radial end to the raceway surface side, and an annular second race member incorporated in the annular portion of the first race member, A thrust roller bearing, wherein both the race members are assembled as a race ring set, and at least one of them is constituted by a damping member. The second race member constitutes the raceway side of the raceway,
2. The first track member according to claim 1, wherein an annular portion of the first track member constitutes a back side of the track ring, and a second track member is mounted on the ring portion and assembled. Thrust roller bearing. The second race member constitutes the back side of the race,
2. The first track member according to claim 1, wherein an annular portion of the first track member constitutes a track surface side of the track ring, and a second track member is assembled to the back surface of the ring portion. Thrust roller bearing. The first track member has an annular portion that constitutes the raceway surface side of the bearing ring, and an inner diameter side end portion of the annular portion includes an inner diameter side flange portion on the back side, and 2 track members are assembled,
The said 2nd track member comprises the back side of a bearing ring, and the inner diameter side edge part contact | abuts to the side surface of an inner diameter side flange part, and is positioned in the radial direction. Thrust roller bearing.

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