JP2017141872A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of reducing the number of components and simplifying procedure in assembly of a bearing into a shaft case and a shaft.SOLUTION: A rolling bearing includes an inner ring having a raceway surface on its outer diameter surface, an outer ring having a raceway surface on its inner diameter surface, and a plurality of rolling bodies arranged between the inner ring and the outer ring in a rollable manner. On at least one width surface of the inner ring and outer ring, an elastic portion is provided as an integrated article without any separation. In a device assembled state, the elastic portion constitutes a preload adjustment unit configured to apply a load to the width surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing, and more particularly, to a rolling bearing used for a transmission and a differential of an automobile.

  Such rolling bearings include deep groove ball bearings, angular ball bearings, and tapered roller bearings. And these usually applied the preload in order to suppress the radial displacement of the shaft diameter and the axial displacement and increase the rigidity. The preload methods are roughly classified into “fixed position preload” and “constant pressure preload”.

  Fixed position preload is a method of applying preload based on the positional relationship between components. This fixed position preload has the advantage that the components are simple and the rigidity is relatively high. Constant pressure preload is a structure in which preload is applied using a coil spring, wave washer, or the like. There is an advantage that the change in the preload amount with respect to the temperature is small.

  Conventionally, there is a preload device as shown in FIG. This preloading device is provided with a washer 1, a presser washer 2, and an elastic ring 3 interposed therebetween. That is, the rotor 8 is externally fitted to the shaft 6 press-fitted and fixed to the frame 5 via a pair of bearings 7A and 7B. In this case, a circumferential groove 10 is provided at the tip of the shaft 6, and a retaining ring (stopper ring) 11 is attached to the circumferential groove 10, and the retaining ring 11 and the outer end surface 9a of the inner ring 9 of the bearing 7A Between the washer 1, the elastic ring 3, and the presser washer 2 are interposed.

  In this case, the pressing member 12 is constituted by the presser washer 2 and the stopper ring 11. For this reason, the elastic ring 3 sandwiched between the washer 1 and the presser washer 2 is compressed by the stopper ring 11, and the elastic ring itself becomes a repulsive force and acts as a pressure on the bearing 7A. .

Japanese Utility Model Publication No. 61-133120

  In the fixed position preload, there is a possibility that the preload amount may change due to expansion / contraction due to a temperature change, and the preload amount may change due to wear of the component parts, which may cause preload loss. Furthermore, when the bearing is assembled, the preload adjustment is performed by adjusting the nut tightening torque and the shim thickness, which makes the operation (procedure) troublesome.

  The constant pressure preload has the advantage that the amount of preload changes with respect to the temperature is small, but has the disadvantage that the number of components increases and the rigidity is relatively low.

  Moreover, in the thing of the said patent document 1, the preload is loaded with the bearing, the press member, the elastic ring, the washer, etc., and the number of parts has increased. For this reason, when assembling the bearing and the preload device, the operation (procedure) is troublesome.

  Therefore, a rolling bearing capable of reducing the number of parts and simplifying the procedure in assembling the bearing into the shaft box and the shaft is provided.

  A rolling bearing according to the present invention includes an inner ring having a raceway surface on an outer diameter surface, an outer ring having a raceway surface on an inner diameter surface, and a plurality of rolling elements that are freely rollable between the inner ring and the outer ring. Rolling bearing, in which at least one of the inner ring and the outer ring has an elastic part as an integral part without separation, and the elastic part applies a load to the width face in the assembled state of the device. The adjustment unit is configured.

  According to the rolling bearing of this invention, it can set so that the longitudinal direction clamping force from the other member (for example, shaft shoulder part) with which it mounts | wears may be received via a preload adjustment part. In addition, the preload adjusting portion can be configured at a portion having elasticity in the width surface, and the number of parts can be reduced.

  The preload adjusting portion is formed on the width surface of the inner ring, and the inner ring and the preload adjusting portion are formed as an integral part, and the preload adjusting portion is formed on the width surface of the outer ring, and the outer ring and the preload adjusting portion are integrally formed. There are cases where it is configured by.

  The preload adjusting portion is formed on the inner ring and the outer ring, the inner ring preload adjusting portion is formed on one width surface, the outer ring preload adjusting portion is formed on the other width surface corresponding to the other width surface of the outer ring, and the inner ring and its In some cases, the preload adjusting unit is configured as an integral part without separation, and the outer ring and the preload adjusting unit are configured as an integral part without separation. The preload adjusting portion can be formed of a polymer material such as rubber or resin.

  When the preload adjustment part is configured as an integral part of the inner ring or outer ring, the number of parts to be assembled is small in assembly work, and the preload adjustment part does not shift with respect to the outer ring, providing excellent workability. It is possible to assemble with high accuracy.

  Furthermore, it may be a deep groove ball bearing, an angular ball bearing, or a tapered roller bearing. The deep groove ball bearing is a bearing having a raceway surface of a circular arc groove larger than the radius of a ball (ball) as a rolling element, and can load a load in both directions of a radial load and an axial load. Angular contact ball bearings are bearings in which the straight line connecting the contact points of the balls (balls) as rolling elements and the inner and outer rings has a certain angle (contact angle). Load in both directions, radial load and axial load Can be loaded. The tapered roller bearing is a bearing designed so that the raceway surfaces of the inner ring and the outer ring and the conical apex of the roller gather at one point on the bearing center. A conical trapezoidal roller is incorporated as a rolling element and is guided by the large collar of the inner ring. It can receive radial load and unidirectional axial load.

  In the present invention, the axial longitudinal direction tightening force from the mating member can be received by the preload adjusting portion, can be attenuated to the repulsive force that becomes the predetermined preload, and the optimum pressurization can be stably received. Can do. In addition, the number of parts is small, and it is possible to simplify the work of assembling the bearing into the shaft box and the shaft.

It is a rolling bearing of the present invention, and is a sectional view showing the deep groove ball bearing of a 1st embodiment. FIG. 2 is a simplified view of a state where the deep groove ball bearing shown in FIG. 1 is mounted. It is a simplification figure of the state where the deep groove ball bearing of a 2nd embodiment is equipped. It is a simplified diagram of the state where the deep groove ball bearing of a 3rd embodiment is installed. It is a rolling bearing of this invention, Comprising: It is sectional drawing which shows the tapered roller bearing of 4th Embodiment. FIG. 6 is a simplified view showing a state where the tapered roller bearing shown in FIG. 5 is mounted. It is a simplification figure of the state in which the tapered roller bearing of 5th Embodiment is mounted | worn. It is a simplification figure of the state in which the tapered roller bearing of 6th Embodiment is mounted | worn. It is a rolling bearing of this invention, Comprising: It is sectional drawing which shows the angular ball bearing of 7th Embodiment. It is sectional drawing which shows the conventional preload apparatus of a bearing.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a deep groove ball bearing. The deep groove ball bearing 20 includes an outer ring 22 having an arcuate outer raceway surface 21 formed on the inner periphery and an arcuate inner raceway surface facing the outer raceway surface 21 on the outer periphery. , A ball 26 as a plurality of rolling elements accommodated between the outer raceway surface 21 and the inner raceway surface 23, and a cage according to the present invention that supports the ball 26 in a rollable manner. 25 and seal members 27 and 27 attached to the axial end of the outer ring 22.

  The outer ring 22, the inner ring 24, and the ball 26 are made of, for example, high carbon chrome bearing steel such as SUJ2, and the cage 15 is a pressed product of, for example, cold rolled steel (JIS standard SPCC) or the like. It is. As described above, the deep groove ball bearing is a bearing having the raceway surfaces 21 and 23 of arc grooves larger than the radius of the ball (ball 26) as the rolling element.

  In this case, one end face (width face) 24a of the inner ring 24 is provided with a preload adjusting portion 35 (35A). The preload adjusting portion 35 (35A) is provided with a section having a rectangular cross section on the width surface 24a of the inner ring 24, and the inner ring 24 and the preload adjusting portion 35A are configured as an integral part. That is, the elastic part is integrated with the width surface 24a of the inner ring 24 without separation. As a result, the elastic portion constitutes a preload adjusting portion 35A for applying a load to the width surface 24a in the apparatus built-in state. Here, the integrated product is a product in which the inner ring 24 and the preload adjusting portion 35A are integrally joined, and the preload adjusting portion 35A is made of a polymer material such as rubber or resin. For this reason, these can be joined and integrated using an adhesive. Various adhesives can be selected depending on the elastic material constituting the inner ring 24 and the preload adjusting unit 35.

  Further, as a joining method, a fine uneven portion may be formed on the width surface 24a of the inner ring 24, a resin melted into the uneven portion may be poured, and the resin may be solidified and integrated. That is, when the resin enters and hardens into the concavo-convex portion, it is possible to perform strong bonding by the anchor effect. As the rubber, various rubber materials such as natural rubber, nitrile rubber, fluorine rubber, silicone rubber, ethylene propylene rubber, and urethane rubber can be used. As the resin, various resin materials such as fluororesin, polyamide, polyethylene, polyacetal and the like can be used.

  2 shows a state in which the deep groove ball bearing in which the preload adjusting portion 35A is provided on the width surface 24a of the inner ring 24 is attached to the shaft box 30 and the shaft member 31, as shown in FIG. The shaft member 31 includes a bearing mounting portion 31a and a large-diameter portion 31b having a larger diameter than the bearing mounting portion 31a. For this reason, the level | step difference surface 31c is formed between the bearing mounting part 31a and the large diameter part 31b.

  The shaft box 30 is provided with a shaft member storage chamber 32. The shaft member storage chamber 32 has a step surface 32b. The other width surface 22b of the outer ring 22 of the bearing 20 is pressed against the step surface 32b. Become. That is, the bearing 20 is mounted on the bearing mounting portion 31a of the shaft member 31, and the inner ring 24 of the bearing 20 is fitted on the bearing mounting portion 31a of the shaft member 31, and the outer ring 22 of the bearing 20 is stored in the shaft member. It is fitted in the bearing corresponding part 32 a of the chamber 32.

  Then, an axial (axial longitudinal direction) tightening force is received from the step surface 31 c of the shaft member 31 at the preload adjusting portion 35 </ b> A on the one width surface 24 a side of the inner ring 24 of the bearing 20. At this time, the tightening force is received by the step surface 32 b of the shaft member storage chamber 32 through the inner ring 24, the ball 26, and the outer ring 22. Further, the preload adjusting portion 35A has elasticity, and is attenuated to a repulsive force that becomes a predetermined preload.

  According to the rolling bearing of the present invention, it is possible to set so as to receive the longitudinal tightening force from the mating member to be mounted (for example, the shaft shoulder portion and the step surface 31 c) via the preload adjusting portion 35. That is, the axial longitudinal direction tightening force from the mating member can be received by the preload adjusting unit 35, can be attenuated to a repulsive force that becomes a predetermined preload, and the optimum pressurization can be stably received. it can. In addition, the number of parts is small, and it is possible to simplify the work of assembling the bearing into the shaft box and the shaft, thereby contributing to cost reduction.

  The preload adjusting portion 35 is formed on the width surface of the inner ring 24, and the inner ring 24 and the preload adjusting portion 35 are configured as an integral part. Therefore, in the assembling operation, the number of parts to be assembled is small, and the preload adjusting portion 35 has Therefore, it is excellent in assembling workability and can be assembled with high accuracy.

  In FIG. 2, the preload adjusting portion 35A is provided on one width surface 24a of the inner ring 24. However, as shown in FIG. 3, the preload adjusting portion 35 (35B) is provided on the other width surface 22b of the outer ring 22. It may be. Also in this case, the outer ring 22 is provided with a portion having a rectangular cross section on the width surface 22b, and the outer ring 22 and the preload adjusting portion 35B are configured as an integral part. That is, an elastic part is integrated with the width surface 22a of the outer ring 22 without separation. As a result, the portion having this elasticity constitutes a preload adjusting portion preload adjusting portion 35B that applies a load to the width surface 22a in the apparatus built-in state.

  The integrated product is obtained by integrally joining the outer ring 22 and the preload adjusting portion 35B. The preload adjusting portion 35B is made of a polymer material such as rubber or resin similar to the preload adjusting portion 35A. .

  Further, the outer ring 22 and the preload adjusting portion 35B are fine uneven portions on the width surface 22a of the outer ring 22 even if they are integrated with an adhesive, as in the case where the inner ring 24 is provided with the preload adjusting portion 35A. The resin may be formed by pouring a resin melted into the concavo-convex portion and solidifying and integrating the resin.

  Even in the case shown in FIG. 3, the stepped surface 32b receives the axial longitudinal tightening force from the mating member via the preload adjusting portion 35B. For this reason, the preload adjusting unit 35B can attenuate the repulsive force to a predetermined preload, and can stably receive the optimum pressurization. In addition, the number of parts is small, and the assembling work can be simplified, contributing to cost reduction.

  The preload adjusting portion 35 (35B) is formed on the width surface 22b of the outer ring 22, and the outer ring 22 and the preload adjusting portion 35 (35B) are formed as an integral part, so that the number of parts to be assembled is small in the assembling work. The preload adjusting portion is not displaced with respect to the outer ring, is excellent in assembling workability, and can be assembled with high accuracy.

  In FIG. 4, a preload adjusting portion 35 </ b> A is provided on one width surface 24 a of the inner ring 24, and a preload adjusting portion 35 </ b> B is provided on the other width surface 22 b of the outer ring 22. For this reason, the preload adjusting portions 35A and 35B can attenuate the repulsive force to a predetermined preload, and can stably receive the optimum pressure.

  FIG. 5 shows a tapered roller bearing 40, an outer ring 42 having a conical raceway surface 41 on the inner peripheral surface, an inner ring 44 having a conical raceway surface 43 on the outer peripheral surface, and a raceway surface 43 and an outer ring 42 of the inner ring 44. A plurality of tapered rollers 45 as rolling elements interposed between the raceway surface 41 and a raceway surface 41, and a retainer 46 that holds the plurality of tapered rollers 45 at predetermined intervals in the bearing circumferential direction. As a component. Further, the inner ring 44 has a small collar 48 formed on the small diameter side of the raceway surface 43 and a large collar 47 formed on the large diameter side. That is, the large collar 47 receives a thrust load, and the small collar 48 prevents the tapered rollers from falling off. The tapered roller bearing is a bearing designed so that the raceway surfaces 43 and 41 of the inner ring 44 and the outer ring 42 and the conical apex of the roller 45 gather at one point on the bearing center.

  FIG. 6 shows a tapered roller bearing 40 shown in FIG. 5, in which a preload adjusting portion 35A is provided on one width surface (end face) 44a of the inner ring 44, as shown in FIG. As shown, a preload adjusting portion 35B is provided on the other width surface (end surface) 42b of the outer ring 42. Further, in FIG. 8, as shown in FIG. 4, a preload adjusting portion 35A is provided on one width surface 4a of the inner ring 44, and a preload adjusting portion 35B is provided on the other width surface 42b of the outer ring 42.

  For this reason, even such a tapered roller bearing 40 can be attenuated to a repulsive force that becomes a predetermined preload by the preload adjusting portions 35A and 35B, and an optimum pressurization can be stably received. .

  FIG. 9 shows an angular contact ball bearing, which contacts a plurality of rolling elements 56 held rotatably by a cage 55 between both raceway surfaces 53 and 51 of the inner ring 54 and the outer ring 52. It has a structure with a corner interposed. The bearing space between the inner ring 54 and the outer ring 52 is sealed with seals 58 and 58. The angular contact ball bearing is a bearing in which a straight line connecting contact points between balls (balls 56) as rolling elements and the inner ring 54 and the outer ring 52 has a certain angle (contact angle).

  9, even in the angular ball bearing 50, as shown in FIG. 2, a preload adjusting portion 35A is provided on one width surface (end surface) 54a of the inner ring 54, or as shown in FIG. The preload adjusting portion 35B can be provided on the end face 52b. Further, the preload adjusting portion 35A may be provided on one width surface 4a of the inner ring 44, and the preload adjusting portion 35B may be provided on the other width surface 42b of the outer ring 42.

  For this reason, even such an angular ball bearing 50 can be attenuated to a repulsive force that becomes a predetermined preload by the preload adjusting portions 35A and 35B, and an optimum pressurization can be stably received. .

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. The thickness of each preload adjusting portion 35A, 35B is the type of the rolling bearing used. It can be variously changed depending on the size and the material of the preload adjusting portions 35A and 35B. Further, the number of rolling elements of the balls 26 and 56 of the bearings 20, 40 and 50 and the tapered rollers 45 can be arbitrarily set. In the above embodiment, the preload adjusting portion 35 is provided on one of the width surfaces 24a, 44a, 54a of the inner rings 24, 44, 54, or on the other width surface 22b, 42b, 52b of the outer rings 22, 42, 52. However, it may be provided on the other width surfaces 24 b, 44 b, 54 b of the inner rings 24, 44, 54, or may be provided on one width surface 22 a, 42 a, 52 of the outer rings 22, 42, 52.

20 Deep groove ball bearing 21 Raceway surface 22 Outer rings 22a and 22b Width surface 23 Raceway surface 24 Inner rings 24a and 24b Width surface 26 Rolling elements (balls)
35, 35A, 35B Preload adjusting portion 40 Tapered roller bearing 41 Raceway surface 42 Outer rings 42a, 42b Width surface 43 Race surface 44 Inner rings 44a, 44b Width surface 45 Rolling elements (rollers)
50 Angular contact ball bearing 52 Outer rings 52a, 52b Width surfaces 53, 51 Race surface 54 Inner rings 54a, 54b Width surface 55 Cage 56 Rolling elements (balls)

Claims (6)

A rolling bearing comprising an inner ring having a raceway surface on an outer diameter surface, an outer ring having a raceway surface on an inner diameter surface, and a plurality of rolling elements arranged to be freely rollable between the inner ring and the outer ring,
A part having elasticity is integrated with at least one of the width surfaces of the inner ring and the outer ring without separation, and the elastic part constitutes a preload adjusting unit that applies a load to the width surface in a state where the apparatus is assembled. Rolling bearing characterized by   The preload adjusting portion is formed on the inner ring and the outer ring, the inner ring preload adjusting portion is formed on one width surface, the outer ring preload adjusting portion is formed on the other width surface corresponding to the other width surface of the outer ring, and the inner ring and its 2. The rolling bearing according to claim 1, wherein the preload adjusting part is constituted as an integral part without separation, and the outer ring and the preload adjusting part are constituted as an integral part without separation.   The rolling bearing according to claim 1, wherein the preload adjusting portion is formed of a polymer material of rubber or resin.   It is a deep groove ball bearing, The rolling bearing of any one of Claims 1-3 characterized by the above-mentioned.   It is an angular ball bearing, The rolling bearing of any one of Claims 1-3 characterized by the above-mentioned.   It is a tapered roller bearing, The rolling bearing of any one of Claims 1-3 characterized by the above-mentioned.

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