JP2008275124A - Creep prevention mechanism for bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost creep prevention mechanism for a bearing capable of being assembled in a short period of time and surely preventing creeping. <P>SOLUTION: The creep prevention mechanism for the bearing prevents relative slide of bearing rings (inner and outer rings 2, 4) arranged to confront with each other in a relatively rotatable manner and an attachment section (for example, a housing 8) to which the race rings are attached. The creep prevention mechanism is provided with a recessed part G formed by partially recessing a circumferential surface 4s of at least one of the bearing rings (the outer ring) at a side for attaching to the attachment section and a wedge mechanism provided between the recessed part and the attachment section. The wedge mechanism is provided with an elastically deformable elastic part (a spring member 10) and a wedge part (a rolling member 12) kept in a state pressed to the attachment section by the elastic part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for preventing the occurrence of creep during bearing rotation.

  Conventionally, it is known that a relative slip phenomenon occurs between a bearing ring constituting a bearing and a mounting portion (for example, a shaft or a housing) to which these are mounted during rotation of the bearing. The relative slip phenomenon occurs as a creep phenomenon between one bearing ring (e.g., a rotating wheel) and an attachment site, and between the other race ring (i.e., stationary ring) and the installation site. Occurs as a turning phenomenon. When such a relative slip phenomenon occurs, there is a case where the raceway and the mounting portion are worn and play occurs, or the wear powder penetrates into the inside of the bearing to reduce the bearing life. In the following description, the relative slip as described above is generally simply referred to as creep.

  Therefore, for example, Patent Document 1 proposes a technique for preventing the occurrence of creep by forming a recess by partially cutting out both the outer ring and the bearing cover (attachment site) and inserting a ball into the recess. Has been. However, in this technique, since it is necessary to insert the ball in a state where a predetermined preload is applied in the recess, a high-precision processing technique and high assembly accuracy are required for the recess and the ball. There is a problem such as.

  Further, for example, Patent Document 2 proposes a technique for preventing the occurrence of creep by fitting a thin plate elastic ring having a bridge shape into a concave groove formed on the outer periphery of the outer ring. However, in this technique, it takes not only labor and time to form a thin elastic ring, but also requires manufacturing and assembling both the groove and the thin elastic ring with high precision, resulting in an increase in manufacturing cost. There's a problem.

For example, Patent Document 3 proposes a technique for preventing the occurrence of creep by forming recesses at equal intervals on the outer periphery of the outer ring and fitting a pin into the case (attachment site). However, in this technique, it is necessary to separately process a through hole for fitting the pin into the recess in the case (attachment site), and it is necessary to accurately face the through hole and the recess during assembly. For this reason, not only the cost required for processing increases, but also the assembly is troublesome, and it can be applied only when both the bearing and the mounting portion are thick.
Japanese Utility Model Publication No. 4-110222 Japanese Utility Model Laid-Open No. 1-10023 Japanese Utility Model Publication No. 63-35818

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a low-cost bearing that can be easily assembled in a short time and can reliably prevent the occurrence of creep. It is to provide an anti-creep mechanism.

  In order to achieve such an object, the present invention is provided in a bearing having a bearing ring disposed so as to be relatively rotatable so as to prevent relative sliding between the bearing ring and a mounting portion to which the bearing ring is attached. A creeping prevention mechanism for a bearing, comprising: a recessed portion formed by partially recessing a peripheral surface on a mounting side of at least one bearing ring; and a wedge inserted between the recessed portion and the mounting portion The wedge mechanism is configured to include an elastic portion that can be elastically deformed and a wedge portion that is kept pressed against the attachment site by the elastic portion.

  In the present invention, in the wedge mechanism, the wedge portion may be constituted by a rolling member that can rotate in accordance with relative sliding between the race ring and the attachment portion. In this case, the rolling member is held by a cage that can be inserted between the recess and the attachment site. In the present invention, in the wedge mechanism, the elastic portion and the wedge portion may be formed integrally with each other.

According to the present invention, it is possible to realize a low-cost bearing creep prevention mechanism that can be easily assembled in a short time and can reliably prevent the occurrence of creep.
Further, according to the present invention, on the mating surface (the mating surface between the inner ring and the shaft, the mating surface between the outer ring and the housing) of the raceway ring and the mounting portion, the shaft side (for example, the outer periphery of the shaft, the outer periphery of the outer ring) ) Only for the wedge mechanism, and the hole side (for example, inner ring inner periphery, housing inner periphery) does not require any processing. Here, as a method of performing processing for the wedge mechanism on the shaft side, a recess portion as in the present invention may be formed, or instead of the recess portion, for example, a part of the shaft side is cut straight. Or may be excised. In this case, it is troublesome and troublesome to perform the same processing on the hole side, but it is a great merit that there is no need to process the hole side.

The bearing creep prevention mechanism of the present invention will be described below with reference to the accompanying drawings.
FIGS. 1A and 1B show a configuration example of a bearing to which a creep prevention mechanism according to the first embodiment of the present invention is applied, and the bearings are arranged so as to be relatively rotatable. The inner ring 2 and the outer ring 4 are provided, and a plurality of rolling elements 6 are provided between the inner and outer rings 2 and 4 so as to roll freely. In the drawing, “balls” are illustrated as the rolling elements 6, but “rollers” may be applied. Also, the inner and outer rings 2, 4 can be configured as a rotating wheel and the other as a stationary ring, depending on the purpose and environment of use of the bearing.

  In such a bearing, the creep prevention mechanism of the present embodiment is configured to prevent relative sliding between the inner and outer rings 2 and 4 and the mounting portion to which the inner and outer rings 2 and 4 are attached. For example, a rotating shaft (not shown) to which the inner ring 2 is attached, a housing 8 to which the outer ring 4 is attached, and the like can be applied as the attachment portion. Here, the housing 8 is assumed as an example of the attachment portion. The case where the relative sliding of 8 and the outer ring | wheel 4 is prevented is demonstrated.

  In this case, the creep prevention mechanism includes a recess portion G formed by partially recessing the peripheral surface 4 s on the side of the outer ring 4 attached to the housing 8, and a wedge mechanism inserted between the recess portion G and the housing 8. It has. The hollow portion G has a wide, substantially rectangular shape and extends in the circumferential direction of the outer ring 4, and the wedge mechanism can be accommodated therein. In addition, since shapes, such as the width | variety of the hollow part G, depth, and length, are arbitrarily set according to the magnitude | size, shape, etc. of the outer ring | wheel 4 or a wedge mechanism, for example, it does not specifically limit here. Moreover, the formation method of the hollow part G may be formed simultaneously with the formation of the outer ring 4, for example, or may be formed by cutting the peripheral surface 4 s after the formation of the outer ring 4.

  On the other hand, the wedge mechanism includes an elastic portion that can be elastically deformed and a wedge portion that is kept pressed against the housing 8 by the elastic portion. In the present embodiment, the elastic portion is configured by a substantially rectangular spring member 10 that can be accommodated in the recess portion G, and the wedge portion is rotatable in accordance with relative sliding between the outer ring 4 and the housing 8. The cylindrical rolling member 12 is formed.

Here, a method for inserting the wedge mechanism between the recess G and the housing 8 will be described. Note that this method is merely an example, and other methods can be applied.
The spring member 10 is in a state in which both ends 10e are separated from each other by its own elastic force (that is, the entire spring member 10 is extended) in a free state before being fitted into the recess G. In this state, first, the spring member 10 is elastically deformed by pressing both ends 10e toward each other, whereby the entire spring member 10 is bent and contracted.

  Next, the spring member 10 is inserted along the circumferential direction of the recess G while maintaining the curved state of the entire spring member 10, and then the pressure on both ends 10 e is released, and the spring member 10. To release. At this time, the spring member 10 is extended by its own elastic force (returning force), so that both ends 10 e are applied to both sides in the circumferential direction of the recessed portion G. Thereby, the spring member 10 is fitted and fixed in a state where both ends 10e are applied to both sides in the circumferential direction of the recessed portion G.

  Subsequently, the cylindrical rolling member 12 is inserted into the recess G while being applied to the spring member 10. At this time, as shown in FIG. 1B, the rotation center axis R of the rolling member 12 is inserted so that the circumferential direction (bearing rotation direction) of the outer ring 4 is orthogonal. Then, the outer ring 4 is attached to the housing 8 while maintaining the state in which the rolling member 12 is pushed in so as to be positioned inside the peripheral surface 4 s of the outer ring 4. Thereby, as shown to Fig.1 (a), a wedge mechanism can be inserted between the hollow part G and the housing 8. FIG.

  In this state, the rolling member 12 is kept pressed against the housing 8 by the spring member 10. At this time, the spring member 10 is in a state where the part S1 where the rolling member 12 is applied is dented and the other part (the part S2 on both ends 10e side) is raised. In other words, the gap between the spring member 10 and the housing 8 is reduced from the location S1 where the rolling member 12 is applied toward the other location S2 on both sides of the bearing rotation direction.

  In this case, when the outer ring 4 and the housing 8 slide relative to each other during the rotation of the bearing, the rolling member 12 rotates between the spring member 10 and the housing 8, and eventually the spring member 10 and the housing 8 are moved. In the other part S2 where the gap is reduced, the state is held between the spring member 10 and the housing 8. At this time, since the rolling member 12 exhibits a so-called wedge effect, the outer ring 4 and the housing 8 can be prevented from further slipping (creeping).

  As described above, according to the present embodiment, the rolling member 12 is simply pressed into the housing 8 by the spring member 10 by fitting the spring member 10 into the recess G and setting the rolling member 12 there. can do. Thereby, a creep prevention mechanism can be easily assembled in a short time compared with the past. In this case, since the pressing force of the rolling member 12 against the housing 8 is automatically adjusted to an optimum state by the elastic force of the spring member 10, the occurrence of creep can be reliably prevented as compared with the conventional case.

  Further, it is not necessary to add any hand to the housing 8, and only the recess G is processed into a part of the peripheral surface 4s of the outer ring 4. In this case, since the hollow part G should just be formed to such an extent that the spring member 10 can be fitted, it is not necessary to increase the processing accuracy. Thereby, a low-cost creep prevention mechanism can be realized as compared with the conventional one.

  In the above-described embodiment, the material of the spring member 10 and the rolling member 12 is not particularly mentioned, but any material having elasticity (for example, a metal material or a resin material) is applied as the spring member 10. Is possible. In addition, as the rolling member 12, any material such as a metal material or a resin material can be applied as long as it is a highly rigid material capable of exhibiting the wedge effect.

  In the embodiment described above, one rolling member 12 is applied. However, the present invention is not limited to this. For example, as shown in FIG. 1C, a plurality of rolling members 12 may be applied. . In this case, the spring member 10 may be configured such that all the rolling members 12 can be pressed against the housing 8 and fitted into the recess G to be fixed. Note that the same effect as that of the above-described embodiment can also be realized by the creep prevention mechanism according to such another configuration.

  FIGS. 2A and 2B show a configuration example of a bearing to which the creep prevention mechanism according to the second embodiment of the present invention is applied. In the creep prevention mechanism, the recess G has a substantially rectangular shape with a narrow width and extends in the circumferential direction of the outer ring 4, and the wedge mechanism can be accommodated therein. Further, in the wedge mechanism, the elastic part is constituted by a compression coil spring 14, and the wedge part is constituted by a spherical rolling member 16 disposed on both sides of the compression coil spring 14.

  Here, the substantially central portion of the hollow portion G is deepest, and becomes shallower in a curved surface toward both sides Gs (both sides along the circumferential direction of the outer ring 4 (bearing rotation direction)). It is continuous with the peripheral surface 4s. In other words, the gap between the recess 8 and the housing 8 is the largest at the central portion of the recess G, and the clearance between the recess G and the housing 8 decreases smoothly in a curved line from there toward both sides Gs. Yes.

  The compression coil spring 14 is disposed in the recess G in parallel along the circumferential direction (bearing rotation direction) of the outer ring 4, and rolling members 16 are disposed on both sides of the compression coil spring 14 ( FIG. 2 (b)). In this case, the compression coil spring 14 and the rolling member 16 may be connected to each other, or may be arranged so as to apply the rolling member 16 to both ends of the compression coil spring 14 without being connected to each other.

  Here, the method of inserting the wedge mechanism between the recess portion G and the housing 8 is, for example, pressing in the direction in which both the rolling members 16 are approached and the compression coil spring 14 is elastically deformed and contracted. Insert into part G. The outer ring 4 is attached to the housing 8 while maintaining this state. Thereby, as shown in FIG. 2A, the wedge mechanism can be inserted between the recessed portion G and the housing 8. In this state, each rolling member 16 is pressed toward both sides Gs of the recess G by the compression coil spring 14. As for the hollow part G, the clearance gap with the housing 8 becomes small as it goes to the both sides Gs. For this reason, each rolling member 16 is maintained in a state of being pressed against the housing 8 by the compression coil spring 14.

  In such a configuration, when the outer ring 4 and the housing 8 slide relative to each other during the rotation of the bearing, the rolling member 16 rotates between the recess portion G and the housing 8, but eventually both sides of the recess portion G. It is maintained in a state of being sandwiched between Gs, the compression coil spring 14 and the housing 8. At this time, since the rolling member 16 exhibits a so-called wedge effect, the outer ring 4 and the housing 8 can be prevented from further sliding (creeping).

  As described above, according to the present embodiment, only by setting the compression coil spring 14 and the rolling member 16 in the recess G, the rolling member 16 can be maintained in a state of being pressed against the housing 8 by the compression coil spring 14. it can. Thereby, a creep prevention mechanism can be easily assembled in a short time compared with the past. In this case, since the pressing force of the rolling member 16 against the housing 8 is automatically adjusted to an optimum state by the elastic force of the compression coil spring 14, the occurrence of creep can be reliably prevented as compared with the conventional case. Since other effects are the same as those of the first embodiment described above, description thereof is omitted.

  In the above-described embodiment, the recess G has a configuration in which the gap with the housing 8 is smoothly reduced in a curved shape from the central portion toward both sides Gs. Instead, for example, FIG. ), The recess G may have a substantially V-shaped configuration in which the gap with the housing 8 is linearly reduced from the central portion toward both sides Gs.

  Further, for example, as shown in FIG. 2 (d), the recess G may be configured to be straight from the central portion toward both sides Gs. In this case, since the housing 8 is circular even if the hollow portion G is straight, the gap between the hollow portion G and the housing 8 becomes smaller from the central portion toward both sides Gs. As a result, the rolling member 16 can exhibit a so-called wedge effect.

  In the above-described embodiment, the compression coil spring 14 and the material of the rolling member 16 are not particularly mentioned. However, the compression coil spring 14 is an arbitrary material having elasticity (for example, a metal material or a resin material). It is possible to apply. Further, as the rolling member 16, any material such as a metal material or a resin material can be applied as long as it is a material having high rigidity capable of exhibiting the wedge effect.

  In the above-described embodiment, the configuration in which the rolling members 16 are arranged one by one on both sides of one compression coil spring 14 is exemplified. However, the present invention is not limited to this. For example, the compression coil spring 14 is recessed. It is also possible to adopt a configuration in which a plurality of rolling members 16 are arranged in parallel in the width direction of G (the direction crossing the circumferential direction of the outer ring 4), and on both sides of each compression coil spring 14.

  FIG. 3A shows a configuration example of a bearing to which the creep prevention mechanism according to the first modification of the present invention is applied. The creep prevention mechanism according to the present modification is the same as the above-described wedge mechanism according to the first embodiment, except that the wedge portion (the cylindrical rolling member 12) can be inserted between the recess portion G and the housing 8. Is held and configured. In this case, the retainer H is formed with a pocket Hp that rotatably holds a plurality of (for example, two) rolling members 12 in parallel with each other. The pocket Hp is provided with a support portion (not shown) capable of supporting the rotating shaft 12a protruding from both ends of each rolling member 12, and each rolling member 12 incorporated in the pocket Hp has its rotating shaft 12a. Is supported by the support portion.

  The elastic part of the wedge mechanism is constituted by a spring member 18 obtained by bending a substantially rectangular thin plate member into a U shape. The spring member 18 is configured such that the bent portion 18e is interposed between the two rolling members 12 held in the cage H (pocket Hp). In this case, the bent portion 18e is pressed between the rolling members 12 in a state where the bent portion 18e is pressed in the direction in which the bent portions 18e approach each other and the spring member 18 is elastically deformed and contracted, and then the bent portion 18e is pressed Is released to release the spring member 18. At this time, the return force between the bent portions 18e acts on each rolling member 12, so that each rolling member 12 is held in the cage H (pocket Hp) in a state of receiving the biasing force of the spring member 18.

  Accordingly, each rolling member 12 is held by the cage H without being dropped from the pocket Hp in a state where the urging force of the spring member 18 is received. In this state, each rolling member 12 is movable in the range of the pocket Hp against the biasing force of the spring member 18. Here, when the hollow part G is formed so as to penetrate the outer ring 4 in the direction crossing the outer periphery 4 s, the outer ring 4 and the housing 8 are mounted with the outer ring 4 attached to the housing 8 (FIG. 1A). It will be in the state which the hollow part G penetrated between. In this case, the cage H can be inserted into the recess G after the outer ring 4 is attached to the housing 8.

  For example, the retainer H is inserted into the hollow portion G in a state where the entire spring member 18 is curved and contracted by pressing the rolling members 12 in a direction in which the rolling members 12 approach each other and elastically deforming the spring member 18. At this time, the retainer H is inserted into the recess G so that the rotation shaft 12a of the rolling member 12 is in a direction orthogonal to the circumferential direction (bearing rotation direction) of the outer ring 4. Then, after inserting the retainer H into the recess G, when the spring member 18 is released by releasing the pressure on the rolling member 12, the spring member 18 is extended by its own elastic force (return force). The rolling member 12 can be maintained in a state where it is pressed against the recess G and the housing 8. Thereby, the wedge mechanism can be inserted between the recess G and the housing 8.

  In addition, although it did not mention in particular about the magnitude | size and shape of the hollow part G or the holder | retainer H, if the rectangular holder | retainer H as shown in a figure, for example, the rectangular-shaped hollow part G matched with this is set to the outer ring | wheel 4 The outer periphery 4s may be formed. In short, there is no particular limitation as long as the hollow portion H has a shape into which a cage H having an arbitrary shape can be inserted. As the material of the spring member 18, any material having elasticity (for example, a metal material or a resin material) can be applied.

  In such a configuration, when the outer ring 4 and the housing 8 slide relative to each other during the rotation of the bearing, the rolling member 12 rotates between the recess G and the housing 8, but eventually the recess G and the spring are rotated. The state of being sandwiched between the member 18 (bent portion 18e) and the housing 8 is maintained. At this time, since the rolling member 12 exhibits a so-called wedge effect, the outer ring 4 and the housing 8 can be prevented from further slipping (creeping).

  As described above, according to the first modification, after the outer ring 4 is attached to the housing 8 (FIG. 1A), the wedge mechanism is simply inserted into the recess G so that the wedge mechanism is connected to the recess G and the housing 8. Can be inserted with high accuracy. For this reason, a creep prevention mechanism can be easily assembled in a short time compared with the past. In this case, since the pressing force of the rolling member 12 against the housing 8 is automatically adjusted to an optimum state by the elastic force of the spring member 18 (bending portion 18e), the occurrence of creep can be reliably prevented as compared with the conventional case. it can. Since other effects are the same as those of the first embodiment described above, description thereof is omitted.

  FIG. 3B shows a configuration example of a bearing to which the creep prevention mechanism according to the second modification of the present invention is applied. The creep prevention mechanism according to the present modification is the same as the above-described wedge mechanism according to the second embodiment, except that the wedge portion (spherical rolling member 16) can be inserted between the recess portion G and the housing 8. Is held and configured. In this case, the holder H is formed with a pocket Hp that holds a plurality of (for example, two) rolling members 16 in parallel with each other so as to be rotatable.

  Further, the elastic part of the wedge mechanism is constituted by a spring member 20 obtained by bending a substantially rectangular thin plate member into a W shape. The spring member 20 is configured such that the arcuate bent portion 20e is interposed between the two rolling members 16 held in the cage H (pocket Hp). In this case, after the arc-shaped bent portion 20e is pressed in the direction in which the arc-shaped bent portions 20e approach each other and the spring member 20 is elastically deformed and contracted, the arc-shaped bent portion 20e is inserted between the rolling members 16 and then arc-shaped. The pressure on the bent portion 20e is released, and the spring member 20 is released. At this time, the return force between the arcuate bent portions 20e acts on each rolling member 16, so that each rolling member 16 is held in the cage H (pocket Hp) in a state of receiving the biasing force of the spring member 20. The

  Thereby, each rolling member 16 is held by the retainer H without dropping from the pocket Hp in a state where the urging force of the spring member 20 is received. In this state, each rolling member 16 is in a state in which it can move within the range of the pocket Hp against the urging force of the spring member 20. Here, when the hollow part G is formed so as to penetrate the outer ring 4 in the direction crossing the outer periphery 4 s, the outer ring 4 and the housing 8 are mounted with the outer ring 4 attached to the housing 8 (FIG. 1A). It will be in the state which the hollow part G penetrated between. In this case, the cage H can be inserted into the recess G after the outer ring 4 is attached to the housing 8.

  For example, the retainer H is inserted into the recessed portion G in a state where the entire spring member 20 is bent and contracted by pressing the rolling members 16 in a direction in which the rolling members 16 approach each other and elastically deforming the spring member 20. At this time, the retainer H is inserted into the recess G so that the two rolling members 16 are aligned along the circumferential direction of the outer ring 4 (bearing rotation direction). Then, after inserting the retainer H into the recess G, when the spring member 20 is released by releasing the pressure on the rolling member 16, the spring member 20 expands with its own elastic force (return force). The rolling member 16 can be maintained in a state of being pressed against the recess G and the housing 8. Thereby, the wedge mechanism can be inserted between the recess G and the housing 8.

  In such a configuration, when the outer ring 4 and the housing 8 slide relative to each other during the rotation of the bearing, the rolling member 16 rotates between the recess portion G and the housing 8, but eventually the recess portion G and the spring. The state of being sandwiched between the member 20 (arc-shaped bent portion 20e) and the housing 8 is maintained. At this time, since the rolling member 12 exhibits a so-called wedge effect, the outer ring 4 and the housing 8 can be prevented from further slipping (creeping). In addition, in this modification, since another structure and effect are the same as that of the 1st modification mentioned above, the description is abbreviate | omitted. As the material of the spring member 20, any material having elasticity (for example, a metal material or a resin material) can be applied.

  FIG. 3C shows a configuration example of a bearing to which the creep prevention mechanism according to the third modification of the present invention is applied. The creep prevention mechanism of this modification is configured by directly holding the wedge part (the cylindrical rolling member 12) on the elastic part in the wedge mechanism of the first embodiment described above. In this case, the elastic portion is constituted by a spring member 22 having a function capable of rotatably holding a plurality of (for example, two) rolling members 12 in parallel with each other. The spring member 22 is configured by bending a substantially rectangular thin plate member into a U shape, and support portions 22a capable of supporting the rotating shafts 12a protruding from both ends of each rolling member 12 are provided on both sides of the bent end. It is integrally molded.

  According to this configuration, each rolling member 12 is assembled to the spring member 22 and the rotating shaft 12a is supported by the support portion 22a, whereby each rolling member 12 can be elastically held with respect to the spring member 22. it can. In addition, the method of supporting the rotating shaft 12a with the support portion 22a is, for example, in a state where the supporting portion 22a is plastically deformed so as to hold the rotating shaft 12a or the rotating shaft 12a is applied to the supporting portion 22a. Arbitrary methods, such as a method of adding a retaining ring around, can be applied. In short, as long as each rolling member 12 can be rotatably held with respect to the spring member 22, the method is not limited.

  Here, when the hollow part G is formed so as to penetrate the outer ring 4 in the direction crossing the outer periphery 4 s, the outer ring 4 and the housing 8 are mounted with the outer ring 4 attached to the housing 8 (FIG. 1A). It will be in the state which the hollow part G penetrated between. In this case, the spring member 22 can be inserted into the recess G after the outer ring 4 is attached to the housing 8. In this modified example (FIG. 3C), instead of the hollow portion G, for example, a part of the outer periphery 4s of the outer ring 4 may be cut out straight or cut off.

  For example, the spring member 22 is elastically deformed by pressing the rolling members 12 in a direction in which the rolling members 12 approach each other, whereby the whole spring member 22 is curved and contracted and inserted into the recess G. At this time, the spring member 22 is inserted into the recess G together with the rolling member 12 so that the rotating shaft 12a of the rolling member 12 is oriented in a direction orthogonal to the circumferential direction (bearing rotating direction) of the outer ring 4. Then, after inserting the spring member 22 into the recess G, when the spring member 22 is released by releasing the pressure on the rolling member 12, the spring member 22 expands with its own elastic force (return force). The rolling member 12 can be maintained in a state where it is pressed against the recess G and the housing 8. Thereby, the wedge mechanism can be inserted between the recess G and the housing 8.

  In such a configuration, when the outer ring 4 and the housing 8 slide relative to each other during the rotation of the bearing, the rolling member 12 rotates between the recess G and the housing 8, but eventually the recess G and the spring are rotated. The state of being sandwiched between the member 22 and the housing 8 is maintained. At this time, since the rolling member 12 exhibits a so-called wedge effect, the outer ring 4 and the housing 8 can be prevented from further slipping (creeping). In addition, in this modification, since another structure and effect are the same as that of the 1st modification mentioned above, the description is abbreviate | omitted. As the material of the spring member 22, any material having elasticity (for example, a metal material or a resin material) can be applied.

  FIGS. 4A and 4B show a configuration example of a bearing to which the creep prevention mechanism according to the third embodiment of the present invention is applied. The creep prevention mechanism includes a hollow portion G formed by partially cutting a peripheral surface 4s on the side of the outer ring 4 attached to the housing 8, and a wedge mechanism that is interposed between the hollow portion G and the housing 8. And. Note that the notch width, depth, notch width, and the like of the recessed portion G are arbitrarily set according to the size and shape of the outer ring 4 and the wedge mechanism, and are not particularly limited here. Moreover, the formation method of the hollow part G may be formed simultaneously with the formation of the outer ring 4, for example, or may be formed by cutting the peripheral surface 4 s after the formation of the outer ring 4.

  On the other hand, the wedge mechanism 24 includes an elastic portion 24a that can be elastically deformed and a wedge portion 24b that is kept pressed against the housing 8 by the elastic portion 24a. The wedge portion 24b is disposed on both sides of the elastic portion 24a, and the elastic portion 24a and the wedge portion 24b are integrally formed with each other. In this case, the wedge portion 24b is formed by bending (rounding) both sides of a substantially rectangular thin plate member, for example. On the other hand, the elastic portion 24a bends the central portion of the thin plate member in the bending direction of the wedge portion 24b, and is partially provided with notches P1 and perforations P2. Thus, the elastic part 24a can be given elasticity by providing the notches P1 and the perforations P2.

  In addition, although a pair of notch P1 and one perforation P2 are illustrated in drawing, the elastic part is changed according to the use purpose and use environment of a bearing by increasing / decreasing the magnitude | size, shape, or number of objects. The elasticity of 24a can be given strength. In this case, the notch P1 and the perforation P2 may be formed simultaneously with the formation of the wedge mechanism 24, or may be formed in the elastic portion 24a after the formation of the wedge mechanism 24. Further, as the material of the wedge mechanism 24, any material having elasticity (for example, a metal material, a resin material, etc.) can be applied.

Here, a method for inserting the wedge mechanism between the recess G and the housing 8 will be described. Note that this method is merely an example, and other methods can be applied.
The wedge mechanism 24 is in a state in which the wedge portions 24b at both ends thereof are separated from each other by the elastic force of the elastic portion 24a in a free state before being fitted into the recess portion G (that is, the wedge mechanism 24 as a whole is extended). Yes. In addition, as described above, the recess portion G is formed by partially cutting the peripheral surface 4s of the outer ring 4 in a straight manner, so that the outer ring 4 and the housing 8 It will be in the state which the hollow part G penetrated between. In this case, the wedge mechanism 24 can be inserted into the recess G after the outer ring 4 is attached to the housing 8.

  In this state, the wedge portion 24b is pressed in the direction in which the wedge portions 24b approach each other to elastically deform the elastic portion 24a, so that the entire wedge mechanism 24 is bent and contracted and inserted into the recessed portion G. At this time, the wedge mechanism 24 is inserted into the recess portion G so that the two wedge portions 24b are aligned along the circumferential direction (bearing rotation direction) of the outer ring 4. Then, after the wedge mechanism 24 is inserted into the recess G, when the elastic portion 24a is released by releasing the pressure on the wedge portion 24b, the elastic portion 24a expands with its own elastic force (return force). The wedge portion 24b can be maintained in a state where it is pressed against the recessed portion G and the housing 8. Thereby, the wedge mechanism can be inserted between the recess G and the housing 8.

  In such a configuration, when the outer ring 4 and the housing 8 slide relative to each other during the rotation of the bearing, the wedge portion 24b slides between the recess G and the housing 8 along with this, but eventually the recess G The state of being sandwiched between the housing 8 is maintained. At this time, since the wedge portion 24b exhibits a so-called wedge effect, the outer ring 4 and the housing 8 can be prevented from further sliding (creeping).

  As described above, according to the present embodiment, the wedge portion 24 b can be maintained in a state of being pressed against the recess portion G and the housing 8 only by inserting the wedge mechanism 24 into the recess portion G. For this reason, a creep prevention mechanism can be easily assembled in a short time compared with the past. In this case, since the pressing force of the wedge portion 24b against the housing 8 is automatically adjusted to an optimum state by the elastic force of the elastic portion 24a, the occurrence of creep can be reliably prevented as compared with the conventional case.

  Further, in the wedge mechanism 24, the central portion of the elastic portion 24a is bent in the bending direction of the wedge portion 24b so that the central portion of the elastic portion 24a is offset from the line connecting the centers of the both wedge portions 24b. Is set. In this case, the elastic portion 24a can be elastically deformed smoothly. As a result, the entire wedge mechanism 24 can be smoothly curved and contracted. Thereby, the said wedge mechanism 24 can be easily inserted in the hollow part G in a short time. Since other effects are the same as those of the first embodiment described above, description thereof is omitted.

  In the above-described embodiment, the recess portion G has a configuration in which the peripheral surface 4s of the outer ring 4 is partially cut straight, but instead, for example, as shown in FIG. G may have a substantially V-shaped configuration in which a gap with the housing 8 is linearly reduced from the central portion toward both sides.

  In the first to third embodiments and the first to third modifications described above, the case where one creep prevention mechanism is provided on the peripheral surface 4s of the outer ring 4 is illustrated, but the present invention is not limited thereto. However, a plurality of creep prevention mechanisms may be provided at predetermined intervals along the peripheral surface 4s of the outer ring 4.

  In the first to third embodiments and the first to third modifications described above, the creep prevention mechanism that prevents relative sliding between the housing 8 and the outer ring 4 has been described. However, the present invention is not limited to this. In order to prevent relative sliding between the rotating shaft (not shown) and the inner ring 2, a creep prevention mechanism similar to that in the first to third embodiments and the first to third modifications is provided. You may apply to the inner ring | wheel 2, or you may apply the same creep prevention mechanism to the outer periphery of the rotating shaft with which the said inner ring | wheel 2 fits. Here, as a method of applying the creep prevention mechanism to the outer periphery of the rotating shaft, the recess portion G may be formed on the outer periphery of the rotating shaft, or instead of the recess portion G, for example, The part may be cut straight or cut out, and the wedge mechanism may be interposed there as described above. In this case, it is troublesome and troublesome to apply the same processing to the inner periphery (the mating surface with the rotating shaft) of the inner ring 2, but it is a great advantage that the inner periphery of the inner ring 2 does not need to be processed. become.

  In the first to third embodiments and the first to third modifications described above, it is assumed that the creep prevention mechanism is applied to one of the inner ring 2 and the outer ring 4, but the present invention is not limited to this. The present invention may be applied to both the inner and outer rings 2 and 4.

(a) is sectional drawing which expands and shows the structure of the creep prevention mechanism for bearings concerning the 1st Embodiment of this invention, (b) is the creep for bearings of the same figure (a) seen from the outer ring | wheel side The top view which expands and shows the structure of a prevention mechanism, (c) is sectional drawing which expands and shows the other structure of the creep prevention mechanism for bearings which concerns on 1st Embodiment. (a) is sectional drawing which expands and shows the structure of the creep prevention mechanism for bearings concerning the 2nd Embodiment of this invention, (b) is the creep for bearing of the figure (a) seen from the outer ring side The top view which expands and shows the structure of a prevention mechanism, (c) is sectional drawing which expands and shows the other structure of the creep prevention mechanism for bearings concerning 2nd Embodiment, (d) is the 2nd Sectional drawing which expands and shows the other structure of the creep prevention mechanism for bearings which concerns on embodiment. (a) is an exploded perspective view showing the structure of the bearing creep prevention mechanism according to the first modification of the present invention, and (b) is a bearing creep prevention mechanism according to the second modification of the present invention. The perspective view which decomposes | disassembles and shows the structure of (c), (c) is a perspective view which decomposes | disassembles and shows the structure of the creep prevention mechanism for bearings concerning the 3rd modification of this invention. (a) is sectional drawing which expands and shows the structure of the creep prevention mechanism for bearings concerning the 3rd Embodiment of this invention, (b) is the creep prevention mechanism for bearings concerning 3rd Embodiment. A perspective view and (c) are expanded sectional views showing other composition of a bearing creep prevention mechanism concerning a 3rd embodiment.

Explanation of symbols

2 Inner ring 4 Outer ring 4s Circumferential surface 8 Housing (mounting part)
10 Spring member (elastic part)
12 Rolling member (wedge)
G hollow

Claims (4)

A bearing creep prevention mechanism for preventing relative sliding between a bearing ring and a mounting portion to which the bearing ring is attached, provided on a bearing having a bearing ring disposed so as to be relatively rotatable.
A hollow portion formed by partially hollowing the peripheral surface to be attached to the attachment portion of at least one bearing ring, and a wedge mechanism inserted between the hollow portion and the attachment portion,
The wedge mechanism is configured to include an elastic portion that can be elastically deformed and a wedge portion that is maintained in a state of being pressed against the attachment site by the elastic portion.   2. The bearing creep prevention mechanism according to claim 1, wherein the wedge portion is formed of a rolling member that can rotate in association with relative sliding between the race ring and the attachment portion. 3.   3. The bearing creep prevention mechanism according to claim 2, wherein the rolling member is held by a cage that can be inserted between the recess and the attachment portion.   The bearing creep prevention mechanism according to claim 1, wherein the elastic portion and the wedge portion are formed integrally with each other in the wedge mechanism.

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