JP2006017180A - Crown retainer made of synthetic resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce bearing torque and to improve wear resistance while preventing removal from a ball bearing when being used for the ball bearing and rotated in a crown retainer 4 made of synthetic resin having a partition part 7 protruding to one side of the axial direction on plural portions of an annular base body 5 along the circumferential direction, and a pocket 6 for housing a ball between the respective partition parts 7. <P>SOLUTION: An outside diameter region and a tip side of an inside diameter region of an inner wall surface (an inner side surface of the respective partition parts 7) constituting the respective pockets 6 are partially spherical surfaces, and parts other than the tip side of the inside diameter region of the inner wall surface is a plane surface 11. Thereby, an area wherein the inner side surface of the respective partition parts 7 and the ball 3 are abutted is reduced even when the partition part 7 is elastically deformed to the radial direction oblique outer side during rotation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin crown-shaped cage used for ball bearings.

  A synthetic resin crown-shaped cage used for a conventional ball bearing is provided with partition portions protruding in one axial direction at a plurality of circumferential positions of an annular base body, and is substantially C-shaped when viewed from the radial direction between the partition portions. It is the structure which has a pocket for ball accommodation (for example, refer to patent documents 1). The pocket is opened toward one of the radial direction and the axial direction. The inner surface of the partition part, that is, the inner wall surface constituting the pocket has a spherical shape. In this crown-shaped cage, in order to make it difficult to come off from the ball of the ball bearing, the tip side of each partition portion is usually wrapped around the ball.

For example, when the conventional crown cage is used for a ball bearing and is rotated at a high speed, each partition portion is easily elastically deformed radially outward with an increase in rotational centrifugal force. The side corners interfere with the balls, increasing the bearing torque and facilitating early wear.
Japanese Patent Laid-Open No. 11-193821

  The present invention reduces the bearing torque and improves the wear resistance while inheriting a configuration in which a crown-shaped cage made of a synthetic resin is less likely to be detached from the ball bearing when used in a ball bearing and rotated. Is a problem to be solved.

  The crown-shaped cage made of a synthetic resin according to the present invention is provided with a partition portion protruding in one axial direction at a plurality of locations around the circumference of the annular mother body and having pockets for receiving balls between the partition portions, The shape along the radial direction of the inner wall surface constituting each pocket is a spherical surface, the outer diameter side region of the inner wall surface constituting each pocket and the distal end side of the inner diameter side region are partial spherical surfaces, and the inner wall surface The portion excluding the tip side of the inner diameter side region is a flat surface along the radial direction.

  According to the present invention, in the state of being used for a ball bearing, when each partition portion is elastically deformed radially outward by a rotational centrifugal force, only the tip side of each partition portion comes into contact with the ball. Thus, it becomes difficult for the flat surface to come into contact with the ball. That is, the area where the inner wall surface (inner side surface of the partition portion) constituting the pocket contacts the ball is reduced, so that the frictional resistance is reduced and the wear area is reduced. Although the inner wall surface constituting the pocket of the crown-shaped cage and the ball are less likely to interfere with each other in this way, the tip side of the inner wall surface is a partial spherical surface, and the inner diameter side corner on the tip side of the inner wall surface is Since it abuts in a state of being wrapped around the ball, it is possible to suppress or prevent the crown-shaped cage from being detached from the ball bearing. In addition, since the portion in contact with the ball, that is, the inner diameter side corner on the tip side of the inner wall surface is in contact with the region where the rotation speed of the ball is low, wear of the contact portion is suppressed.

  Preferably, the flat surface corresponds to a region corresponding to an inner diameter side of a pitch circle passing through the center of each pocket on the inner wall surface and a range from a base side of each partition portion to a predetermined position beyond the center of each pocket. It can be provided in the area to be.

  According to the crown-shaped cage made of the synthetic resin according to the present invention, it is possible to reduce the bearing torque and improve the wear resistance while making it difficult to come off from the ball bearing when it is rotated for use in the ball bearing. .

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.

  First, with reference to FIG. 5 and FIG. 6, the deep groove ball bearing used as the use object of the synthetic resin crown-shaped cage is demonstrated. 5 is a perspective view in which a deep groove ball bearing using the crown-shaped cage shown in FIG. 1 is partially cut away, and FIG. 6 is a cross-sectional view of the deep groove ball bearing shown in FIG.

  The deep groove ball bearing has a configuration in which a large number of balls 3 are interposed between the outer ring 1 and the inner ring 2 facing each other, and the large number of balls 3 are held at substantially equal intervals in the circumferential direction by a crown-shaped cage 4. The crown-shaped cage 4 is a ball guide type in which the ball 3 is rotated and guided by rolling.

  In addition, the outer ring | wheel 1, the inner ring | wheel 2, and the ball | bowl 3 are formed with metals, such as bearing steel and carburized steel, for example. The crown cage 4 is, for example, polyethylene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyphenylene sulfide, polyethersulfone, polyetherimide, polyamideimide, polyetheretherketone, thermoplastic polyimide, thermosetting. It is formed of a synthetic resin such as polyimide, epoxy resin, or phenol resin.

  The crown retainer 4 will be described in detail with reference to FIGS. FIG. 1 is a perspective view showing the best embodiment of the crown-shaped cage, FIG. 2 is a diagram of a part of the crown-shaped cage shown in FIG. 1 expanded and seen from the radial direction, and FIG. 4 is a cross-sectional view of the crown-shaped cage shown in FIG. 4, and FIG. 4 is a cross-sectional view taken along line (4)-(4) shown in FIG.

  The crown-shaped cage 4 is manufactured by molding a synthetic resin, and includes pockets 6 in which the balls 3 are fitted and held at a plurality of locations on the annular base 5 that are substantially equally spaced around the circumference. The pocket 6 is open toward one of the radial direction and the axial direction, and has a substantially C-shaped arc shape when viewed from the radial direction.

  The partition part 7 which protrudes toward one axial direction is provided in the circumferential multiple places of the cyclic | annular base | matrix 5, and the pocket 6 exists between the inner side surfaces which face the circumferential direction of each partition part 7. FIG. A recess 8 that is recessed toward the other side in the axial direction is provided on the distal end side that protrudes toward one side in the axial direction of the partition portion 7, and the recess 8 is provided in the circumferential direction on the distal end side of each partition portion 7 by the recess 8. A bifurcated retaining portion 7a in between is formed. A lubricant such as grease is stored in the recess 8.

  Here, the inner side surfaces facing each other in the circumferential direction of each partition portion 7 constitute the inner wall surface constituting each pocket 6.

  Then, the distal end side of the outer diameter side region and inner diameter side region of the inner wall surface (inner side surface of each partition portion 7) constituting each pocket 6 is a partial spherical surface, and the distal end side of the inner diameter side region on the inner wall surface is A flat surface 11 is provided along the radial direction except the portion.

  Specifically, the flat surface 11 is a region corresponding to the inner diameter side of the pitch circle 12 passing through the center P of each pocket 6 on the inner surface of each partition 7 and the center of each pocket 6 from the base side of each partition 7. It is provided in a region corresponding to a range up to a predetermined position exceeding P.

  With reference to FIG. 7 and FIG. 8, the operation in the case of using the crown-shaped cage 4 will be described.

  The crown-shaped cage 4 is in a state of being incorporated in a deep groove ball bearing as shown in FIGS. Since the crown-shaped cage 4 is in the form of a ball guide, the crown-shaped cage 4 is basically not in contact with the outer ring 1 or the inner ring 2 during the rotation operation. Rolls in contact with the inner wall surface forming the pocket 6 of the crown-shaped cage 4.

  Here, as the rotation speed is increased, as shown in FIGS. 7 and 8, each partition 7 of the crown-shaped cage 4 is elastically deformed radially outward and obliquely outward. Although there is a possibility that the inner diameter side corner portion on the tip side of each partition portion 7 that is elastically deformed may interfere with the ball 3, the flat surface 11 of each partition portion 7 does not need to contact the ball 3.

  Thus, although the area where the inner wall surface constituting the pocket 6 of the crown-shaped cage 4 and the ball 3 abut is reduced, the pocket 6 is substantially C-shaped when viewed from the radial direction and each partition portion 7 has Since the front end side is a partial spherical surface, the inner diameter side corners on the front end side of each partitioning portion 7 come into contact with the ball 3 so that the crown-shaped cage 4 is detached from the deep groove ball bearing. Can be suppressed or prevented. In addition, since a region where the rotation speed of the ball 3 is slow contacts the portion of each partition portion 7 that contacts the ball 3, that is, the inner diameter side corner portion on the tip side of each partition portion 7, the wear of this contact portion is reduced. It is suppressed. Incidentally, in the deep groove ball bearing shown in FIG. 5 and FIG. 6, when the ball 3 rotates and revolves, as shown in FIG. 6, the point intersecting the radial direction line L passing through the center of the ball 3 on the outer surface of the ball 3. The rotation speed at X1 and X2 is the fastest, and the rotation speed at points X3 and X4 intersecting the axial line S passing through the center of the ball 3 on the outer surface of the ball 3 is zero. In the drawing, the center of the ball 3 coincides with the center P of the pocket 6. In the ball 3, the rotation speed is slower as the position approaches the points X3 and X4 from the points X1 and X2. However, the crown-shaped cage 4 has a predetermined clearance in the axial direction and the circumferential direction between the inner surface of each partition 7 of the crown-shaped cage 4 and the outer surface of the ball 3. Since the gap may be shifted in the axial direction during the rotation operation, the center of the ball 3 and the center P of the pocket 6 may be shifted in the axial direction.

  As described above, when the crown-shaped cage 4 according to the present invention is used for a deep groove ball bearing and is rotated at a high speed, each partition portion 7 is elastically deformed radially outward by a rotational centrifugal force. The area where the inner surface of each partition 7 and the ball 3 abut can be reduced. As a result, the frictional resistance can be reduced and the wear area can be reduced, which can contribute to the improvement of the rolling characteristics and life of the deep groove ball bearing.

The perspective view which shows the best embodiment of the crown shaped holder | retainer based on this invention The figure which expanded a part of crown-shaped cage shown in Drawing 1, and was seen from the diameter direction Sectional view of the crown-shaped cage shown in FIG. Arrow view of section (4)-(4) shown in FIG. The perspective view which notched the deep groove ball bearing using the crown type cage shown in FIG. 1 partially Cross section of deep groove ball bearing shown in FIG. The figure explaining that a malfunction does not arise in the deep groove ball bearing shown in FIG. Arrow view of section of line (8)-(8) shown in FIG.

Explanation of symbols

  3 ... ball, 4 ... crown cage, 5 ... annular base, 6 ... pocket, 7 ... partition, 11 ... flat surface.

Claims (2)

A crown-shaped cage made of a synthetic resin provided with a partition portion protruding in one axial direction at a plurality of locations around the circumference of the annular mother body and having a pocket for accommodating a ball between the partition portions,
The distal end side of the outer diameter side region and the inner diameter side region of the inner wall surface constituting each pocket is a partial spherical surface, and the portion excluding the distal end side of the inner diameter side region on the inner wall surface is a flat surface along the radial direction. This is a crown-shaped cage made of synthetic resin.   The flat surface is a region corresponding to an inner diameter side of a pitch circle passing through the center of each pocket on the inner wall surface and a region corresponding to a range from the base side of each partition portion to a predetermined position beyond the center of each pocket. The crown-shaped cage made of synthetic resin according to claim 1, wherein the cage is provided.

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