JP2006258174A - Synthetic resin retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin retainer of which engagement claw does not easily wear when the engagement claw is inserted in an engagement hole and which does not easily create play between annular bodies. <P>SOLUTION: In a synthetic resin retainer having a hemispherical pocket 2 storing a ball on facing surfaces of two annular bodies 1a, 1b facing in an axial direction formed at even intervals in a circumference direction, having an engagement claw 4 projecting in an axial direction provided between adjacent pockets 2, 2 of one annular body 1a, having an engagement hole 5 to which the engagement claw 4 is inserted formed between adjacent pockets 2, 2 of another annular body 1b, and joining the annular bodies 1a, 1b by engaging the engagement claw 4 inserted in the engagement hole 5 with the annular body 1b, an expanding slot 6 is formed on a tip of the engagement claw 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin cage mainly incorporated in a ball bearing for high-speed rotation.

  As a synthetic resin cage, one described in Patent Document 1 below is known. This cage is composed of two annular bodies facing each other in the axial direction, and hemispherical pockets for accommodating balls are formed at equal intervals in the circumferential direction on the opposing surface of each annular body. An engaging claw protruding in the direction and an engaging hole for engaging the engaging claw are formed.

  However, since the entrance of the engagement hole is smaller than the engagement claw, the retainer is worn by rubbing the engagement claw strongly when inserting the engagement claw into the engagement hole. In some cases, backlash occurs between the annular bodies. When the play occurs, the cage may come into contact with the bearing race or the bearing seal to deteriorate the bearing performance.

JP 2003-343571 A

  The problem to be solved by the present invention is to provide a synthetic resin cage in which the engaging claw is less likely to be worn when the engaging claw is inserted into the engaging hole, and the play is less likely to occur between the annular members. .

  In order to solve the above problems, hemispherical pockets for accommodating balls are formed at equal intervals in the circumferential direction on the opposing surfaces of the two annular members facing in the axial direction, and the engaging claws protruding in the axial direction are Provided between adjacent pockets of the annular body, an engaging hole for inserting the engaging claw is formed between adjacent pockets of the other annular body, and the engaging claw inserted into the engaging hole is In the synthetic resin cage that is engaged with the other annular body to join the two annular bodies, a split groove is formed at the tip of the engaging claw.

  When the engagement claw is inserted into the engagement hole, the front end of the engagement claw is elastically deformed in the direction of narrowing the split groove, so that the engagement claw is less likely to be worn and the backlash between the two annular bodies is less likely to occur. .

  FIG. 1 shows an embodiment of the synthetic resin cage of the present invention. The cage is composed of two annular bodies 1a and 1b facing in the axial direction. A hemispherical pocket 2 for accommodating the ball B of the ball bearing is formed on the opposing surfaces of the annular bodies 1a and 1b. The pockets 2 are formed at equal intervals in the circumferential direction as shown in FIG. Yes.

  Between the adjacent pockets 2 and 2 of the annular body 1a, as shown in FIG. 3A, there is provided an engaging claw 4 that protrudes in the axial direction from the mating surface 3 that abuts against the other annular body 1b. Yes. An engagement hole 5 penetrating in the axial direction is formed between adjacent pockets 2, 2 of the annular body 1 b, and the engagement claw 4 of the annular body 1 a is inserted into the engagement hole 5. The tip of the engaging claw 4 is divided into two forks by a split groove 6 as shown in FIG. 3 (b), and can be elastically deformed in the direction of narrowing the split groove 6. Further, a flange portion 7 is formed at the tip of the engagement claw 4, and the flange portion 7 engages with the edge of the engagement hole 5 by elastic recovery of the tip of the engagement claw 4.

  The annular bodies 1a and 1b are made of a synthetic resin molded product. As the synthetic resin, for example, engineering plastics such as polyphenylene sulfide (PPS) can be used.

  This cage can be assembled, for example, as follows. First, the annular bodies 1 a and 1 b are arranged to face each other, and the engagement claws 4 are inserted into the engagement holes 5 with the annular bodies 1 a and 1 b being brought close to each other. Further, when the annular bodies 1a and 1b are brought close to each other and the mating surfaces 3 are brought into contact with each other, the flange portion 7 of the engagement claw 4 passes through the engagement hole 5 and engages with the edge of the engagement hole 5, thereby 1b bind to each other.

  When this synthetic resin cage is used, when the engaging claw 4 is inserted into the engaging hole 5, the tip of the engaging claw 4 is elastically deformed in the direction of narrowing the split groove 6, so that it acts on the flange portion 7. The frictional force is small. Therefore, the collar part 7 of the engaging claw 4 is not easily worn, and rattling is unlikely to occur between the two annular bodies 1a and 1b.

  As shown in FIG. 3 (a), it is preferable to form recesses 8 that form a grease reservoir at both ends of the pockets 2 of the annular bodies 1a and 1b. In this way, the grease held in the recess 8 lubricates the ball B and the inner surface of the pocket 2 and suppresses generation of wear powder and frictional heat due to contact between the ball B and the cage.

  Moreover, it is preferable to form the opening 9 which penetrates to the annular bodies 1a and 1b in the axial direction adjacent to the engagement nail | claw 4 as shown in a figure. When the opening 9 is formed, the molding die can be removed from the undercut portion 10 of the engaging claw 4 through the opening 9, so that the annular bodies 1a and 1b can be easily molded.

  In the figure, the engaging claw 4 is formed with a flange portion 7 projecting in the radial direction at the tip to engage with the annular body 1b. For example, the flange portion 7 may be protruded in the circumferential direction. Any shape may be used as long as the two annular bodies 1a and 1b are joined. When projecting in the circumferential direction to form the flange 7, it is necessary to change the direction of the split groove 6.

  In the figure, the flange portion 7 of the engagement claw 4 is engaged with the edge of the engagement hole 5. However, for example, a step portion is formed on the inner surface of the engagement hole 5, and the engagement claw 4 is formed on the step portion. You may make it the collar part 7 engage. In short, the engagement claws 4 inserted into the engagement holes 5 may be engaged to couple the annular bodies 1a and 1b.

  As shown in the figure, it is preferable that the engaging claws 4 and the engaging holes 5 are alternately arranged in the circumferential direction so that the annular bodies 1a and 1b have the same shape, which is advantageous in terms of production cost.

  Further, the engaging claws 4 and the engaging holes 5 may be arranged side by side in the circumferential direction between the adjacent pockets 2 and 2. In this way, even when the number of the pockets 2 is an odd number, the arrangement of the engaging claws 4 and the engaging holes 5 between the pockets can be unified to make the annular bodies 1a and 1b have the same shape.

  In the above embodiment, the engaging claws 4 are formed on both the annular bodies 1a and 1b, and the engaging holes 5 are also formed on both the annular bodies 1a and 1b. For example, as shown in FIG. May be formed only in the annular body 1a, and the engagement hole 5 may be formed only in the other annular body 1b.

The partially expanded perspective view which shows embodiment of the synthetic resin cage of this invention The top view which shows the annular body of a synthetic resin cage same as the above (A) is sectional drawing which shows a part of synthetic resin cage same as the above, (b) is sectional drawing along the XX line of (a). The top view which shows the modification of a synthetic resin cage same as the above

Explanation of symbols

1a, 1b Annular body 2 Pocket 4 Engaging claw 5 Engaging hole 6 Split groove B Ball

Claims (1)

  Hemispherical pockets for accommodating the balls are formed at equal intervals in the circumferential direction on the opposing surfaces of the two annular members facing in the axial direction, and the engaging claws protruding in the axial direction are formed between adjacent pockets of one annular member. An engaging hole for inserting the engaging claw is formed between adjacent pockets of the other annular body, and the engaging claw inserted into the engaging hole is engaged with the other annular body. A synthetic resin cage for joining the two annular bodies, wherein a split groove is formed at a tip of the engaging claw.

Images