JP2009168082A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost roller bearing capable of reducing the vibration of a rotary drive object. <P>SOLUTION: A clutch-release bearing 10 (roller bearing) includes an outer ring 11, an inner ring 12, a core 15a of a seal 15, a core 16a of a seal 16, and a guide 17, as bearing parts which are made of a damping steel sheet as damping steel members. In each of raceway surfaces 11a, 12a of the outer ring 11 and the inner ring 12, a hard coating layer CL consisting of, for example, a nickel base alloy and cobalt base alloy is formed, respectively. Vibration of the engine is damped by the outer ring 11, the inner ring 11, the core 15a of the seal 15, the core 16a of the seal 16 and the guide 17, therefore the vibration from the clutch release bearing 10 to the other member is damped. The hardness of each of the raceway surfaces 11a, 12a is assured by the hard coating layer CL. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing, and more particularly, to a rolling bearing provided with a press bearing component.

  As this type of rolling bearing, there is known a clutch release bearing in which a raceway ring and a cored bar are made of a steel plate press (see Patent Document 1). A thrust roller bearing in which the cage is made of a steel plate press is also known (see Patent Document 2). Thus, the weight of the vehicle body can be reduced by using a press-formed product as the bearing component.

JP 2006-189086 A JP 2007-232114 A

  By the way, as for a bearing, one of an outer ring | wheel and an inner ring | wheel is generally assembled | attached to a rotation drive body, the other is assembled | attached to a fixed body, and one rotates relatively with respect to the other. For this reason, the vibration of the rotary drive body is easily transmitted to the fixed body through the inner and outer rings of the bearing. In particular, since the clutch release bearing is configured such that the engine is disposed immediately before the clutch release bearing, vibrations of the engine are directly transmitted. This vibration is propagated from the clutch release bearing to each part of the body system through the transmission, and is likely to cause unpleasant vibration. This vibration also causes noise generation. The bearings other than the clutch release bearing may cause the same problem as described above.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rolling bearing capable of reducing vibration of a rotary drive body at a low cost.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-mentioned problems, the present invention is characterized in that in a rolling bearing provided with a press-made bearing part, the bearing part is formed of a vibration-damping steel material. In addition, as the damping steel material, for example, in addition to a composite type in which a polymer material is sandwiched and fixed between two steels, for example, a non-composite type (alloy, such as an Fe—Al—Si alloy or an Fe—Cr alloy) Type). Examples of the press bearing parts include inner and outer race rings, a cage for holding rolling elements, and a seal metal core.

  According to this, when the vibration of the rotary drive body is transmitted to the bearing, the transmitted vibration is attenuated by the bearing components constituting the bearing, and therefore, vibration from the bearing to other members is reduced and unpleasant vibration is generated. It is possible to prevent the occurrence.

  In carrying out the present invention, a hard coating layer may be formed on the bearing component. As the hard coating layer, in addition to the coating layer formed by spraying and melting Ni base, Co base alloy, etc., vapor phase growth is performed by PVD method (physical vapor deposition method), CVD method (chemical vapor deposition method), etc. It is possible to employ a coating layer formed in the above manner. According to this, the wear resistance of the bearing component can be enhanced by the hard coating layer, and it can be sufficiently applied to a bearing component (for example, a bearing ring) that requires a predetermined hardness.

  In this case, the hard coating layer may be formed after press molding. According to this, damage to the hard coating layer can be prevented. In addition, when a hard coating layer is formed by thermal spray melting, the damping function is achieved by press molding by a heating process at a predetermined high temperature in the fusing processing (processing in which the thermal spray coating is melted and welded to the base material). It is possible to obtain the effect of recovering the reduced vibration damping performance of the bearing component.

  Further, in the above, the hard coating layer may be formed at a site where wear resistance is required. By forming the hard coating layer only at the site where wear resistance is required, the efficiency of the hard coating processing and the cost reduction can be achieved.

a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a clutch release bearing 10 according to a first embodiment of the present invention. The clutch release bearing 10 is an outer ring rotating self-aligning type, and a ball 13 (rolling element) and a cage 14 are disposed between the outer ring 11 and the inner ring 12.

  The outer ring 11 is a press-formed product, and the raceway surface 11a of the ball 13 is formed on the inner peripheral surface thereof. An inner flange portion 11b that is curved and extends radially inward is integrally formed on one end side in the axial direction of the outer ring 11 (left end side in FIG. 1), and a diaphragm spring (not shown) is formed on the inner flange portion 11b. It comes to contact. On the other end side in the axial direction of the outer ring 11 (right end side in FIG. 1), a seal 15 having a core bar 15a having a substantially L-shaped cross section is attached. The seal 15 is in contact with the outer peripheral surface of the inner ring 12 and seals between the outer ring 11 and the inner ring 12.

  The inner ring 12 is attached to a sleeve (not shown) via a centering rubber. The inner ring 12 is a press-formed product, and a raceway surface 12a of a ball 13 is formed on the outer peripheral surface thereof.

  An outer flange portion 12b that extends radially outward in a planar shape is integrally formed on one end side in the axial direction of the inner ring 12 (right end side in FIG. 1), and a plate fixed to the sleeve on the outer flange portion 12b. (A member to be pushed by the release fork) comes into contact. On the other end side in the axial direction of the inner ring 12 (left end side in FIG. 1), an inner flange portion 12c extending inward in the radial direction is integrally formed in a planar shape, and the inner flange portion 12c has a substantially L-shaped cross section. A seal 16 having a metal core 16a is attached. The seal 16 is in contact with the inner peripheral surface of the inner flange portion 11 b in the outer ring 11 and seals between the outer ring 11 and the inner ring 12. A guide 17 press-molded into a stepped cylindrical shape for holding the aligning rubber is attached to the inner ring 12 near the outer flange portion 12b.

  By the way, in this 1st Embodiment, the outer ring | wheel 11, the inner ring | wheel 12, the core metal 15a of the seal | sticker 15, the core metal 16a of the seal | sticker 16, and the guide 17 are formed with the damping steel plate as a damping steel material. This vibration-damping steel plate is a composite constrained type in which a polymer material DP such as a thermoplastic viscoelastic resin is sandwiched and fixed between two steels. It has a function of attenuating the vibration from the engine by causing shear deviation between them and converting vibration energy into heat energy.

  Further, a hard coating layer CL made of, for example, a Ni-base alloy or a Co-base alloy is formed on each of the raceway surfaces 11a and 12a of the outer ring 11 and the inner ring 12, respectively. Specifically, after the outer ring 11 and the inner ring 12 are each press-formed into a predetermined shape, a Ni-base alloy, a Co-base alloy, or the like is applied to the raceway surfaces 11a and 12a of the outer ring 11 and the inner ring 12 with a flammable gas or the like. Thermal spraying is applied and attached as a film-like laminate. By bonding this laminated body to the respective raceway surfaces 11a, 12a at, for example, 950 to 1250 ° C. (fusing treatment), the bonding force of the laminate to the respective raceway surfaces 11a, 12a can be enhanced. The raceways 11a and 12a of the outer ring 11 and the inner ring 12 have a hardness of 500 to 800 Hv due to the formation of the hard coating layer CL. The raceways 11a and 12a of the outer ring 11 and the inner ring 12 are subjected to a finishing process such as a polishing process after the melt welding process.

  As is apparent from the above description, in the first embodiment, when engine vibration is transmitted to the clutch release bearing 10, the transmitted vibration is transmitted to the outer ring 11, the inner ring 12, the core 15a of the seal 15, the seal. Since it is attenuated by the 16 metal cores 16a and the guide 17 (attenuation of resonance amplitude, attenuation of vibration speed, etc.), vibration from the clutch release bearing 10 to other members can be reduced to prevent generation of unpleasant vibration. Is possible.

  In the first embodiment, since the hard coating layer CL is formed on the raceway surfaces 11a and 12a of the outer ring 11 and the inner ring 12, the wear resistance of the raceway surfaces 11a and 12a can be improved. . Further, since the hard coating layer CL is formed on the raceway surfaces 11a and 12a after the outer ring 11 and the inner ring 12 are press-molded, the hard coating layer CL is prevented from being damaged.

(Modified embodiment)
In the first embodiment, the composite restraint type damping steel plate is used as the damping steel material. Alternatively, for example, a non-composite type (alloy type) damping steel alloy may be used. Examples of the damping steel alloy include an Fe—Al—Si alloy, an Fe—C—Si alloy, an Fe—Cr alloy, an Fe—Cr—Al alloy, and an Fe—Cr—Mo alloy. When this damping steel alloy is used, the hard coating layer CL is prevented from being damaged by forming the hard coating layer CL on the raceway surfaces 11a and 12a after the outer ring 11 and the inner ring 12 are press-formed. Thus, it is possible to recover the vibration damping performance of the outer ring 11 and the inner ring 12 whose vibration damping function has been lowered due to plastic deformation or the like by press molding.

b. Second Embodiment In the first embodiment and the like, the case where the rolling bearing of the present invention is applied to the clutch release bearing 10 has been described. For example, a thrust roller bearing 20 as shown in FIGS. 2 (a) and 2 (b). You may apply to.

  The thrust roller bearing 20 includes a cage 22 that holds needle rollers 21 (rolling elements), and a race ring 23 that accommodates the cage 22, and both the cage 22 and the race ring 23 are formed by press molding. Is formed. By forming the cage 22 and the bearing ring 23 from a damping steel plate or a damping steel alloy, vibration from the thrust roller bearing 20 to other members is reduced and unpleasant vibration is generated, as in the first embodiment. Can be prevented. In this case, the hardness of the bearing ring 23 can be ensured by forming the hard coating layer CL on the bearing ring 23.

c. Third Embodiment The rolling bearing of the present invention may be applied to a shell roller bearing 30 as shown in FIG. 3, for example. The shell-type roller bearing 30 includes an outer ring 31 (orbital ring) and needle rollers 32 (rolling elements), and the outer ring 31 is formed by press molding. By forming the outer ring 31 from a damping steel plate or a damping steel alloy, the vibration from the shell-shaped roller bearing 30 to other members is reduced and the generation of unpleasant vibration is prevented, as in the first embodiment. It is possible. In this case, the hardness of the outer ring 31 can be ensured by forming the hard coating layer CL on the raceway surface 31 a of the outer ring 31.

d. 4th Embodiment Moreover, you may apply the rolling bearing of this invention to the tapered roller bearing 40 as shown, for example in FIG. In the tapered roller bearing 40, a tapered roller 43 is held by a retainer 44 between raceways formed by an outer ring 41 and an inner ring 42, and the retainer 44 is formed by press molding. By forming the cage 44 from a damping steel plate or a damping steel alloy, the vibration from the tapered roller bearing 40 to other members is reduced and the generation of unpleasant vibration is prevented, as in the first embodiment. It is possible.

  The hard coating layer CL is not limited to being formed by thermal spray melting, and may be formed by, for example, a PVD method or a CVD method.

  The present invention is not limited to the rolling bearings according to the first to fourth embodiments described above, and can be widely applied to various rolling bearings provided with press bearing parts.

The longitudinal cross-sectional view of the clutch release bearing which concerns on 1st Embodiment of this invention. (A) is a top view of the thrust roller bearing which concerns on 2nd Embodiment of this invention. (B) is front sectional drawing of (a). The longitudinal cross-sectional view of the shell type roller bearing which concerns on 3rd Embodiment of this invention. The longitudinal cross-sectional view of the tapered roller bearing which concerns on 4th Embodiment of this invention.

Explanation of symbols

10 Clutch release bearing (rolling bearing)
11 Outer ring (bearing parts)
11a Raceway surface 12 Inner ring (bearing parts)
12a Raceway surface 15, 16 Seal 15a, 16a Core metal (bearing part)
17 Guide (Bearing parts)
DP Polymer material CL Hard coating layer 20 Thrust roller bearing (rolling bearing)
22 Cage (Bearing parts)
23 Bearing rings (bearing parts)
30 Shell type roller bearing (rolling bearing)
31 Outer ring (bearing parts)
40 Tapered roller bearings (rolling bearings)
44 Cage (Bearing parts)

Claims (3)

In rolling bearings with press bearing parts,
The rolling bearing according to claim 1, wherein the bearing part is formed of a vibration-damping steel material.   The rolling bearing according to claim 1, wherein a hard coating layer is formed on the bearing component.   The rolling bearing according to claim 2, wherein the hard coating layer is formed after press molding of the bearing component.

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