JP2007032821A - Resin-made cage for rolling bearing and rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin-made cage for a rolling bearing capable of suppressing twisting and deformation of the cage when it rotates at high speed and to provide the rolling bearing using this cage. <P>SOLUTION: This cage 14 for the rolling bearing like a circular ring is provided with pocket parts 15 holding a plurality of rolling bodies 3 of the rolling bearing 10 so as to roll and being adjacent to each other in the circumferential direction, a pair of claw parts 16 protruding in the axial direction in both end parts in the circumferential direction of an inner peripheral face of the pocket part 15, and an opening part 17 formed between the pair of claw parts 16 and inserting the rolling body 3 into the pocket part 15. A thinning part 19 is provided in an end part in the axial direction on a side where it leaves the opening part 17 and a rib 20 is provided in the thinning part 19 in a column part 18 between the pocket parts 15, and a thinning part 21 is provided in an end part in the axial direction on an opening part 17 side of the column part 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin cage for a rolling bearing and a rolling bearing incorporating the resin cage for a rolling bearing, and more particularly to improving the strength of the resin cage and increasing the speed of the bearing.

  As a conventional rolling bearing, a rolling bearing 50 as shown in FIG. 9 is known. In this rolling bearing 50, a plurality of balls 3 as rolling elements are disposed between an inner ring 1 and an outer ring 2. It is a deep groove ball bearing, and a plurality of balls 3 is held so as to be able to roll at substantially equal intervals in the circumferential direction via an annular crown-shaped cage 4.

  With the recent demands for weight reduction, noise reduction, and speedup, the crown type cage 4 is often used as a resin cage that is injection-molded with a polyamide resin material containing glass fiber. ing. As an example of the resin cage, a crown-shaped resin cage as shown in FIGS. 10 to 12 is known (see, for example, Patent Documents 1 to 5).

  The crown-shaped cage 4 is formed by injection molding of synthetic resin or the like, and the crown-shaped cage 4 has a pocket portion 5 that holds a plurality of balls 3 so as to roll in the circumferential direction at substantially equal intervals. A pair of claw portions 6 that are formed and project in the axial direction are provided at both ends in the circumferential direction of the inner peripheral surface of the pocket portion 5. In addition, an opening 7 is formed in the pair of claws 6, and the ball 3 is pushed into the pocket 5 while expanding the pair of claws 6 from the opening 7. 3 is held so as to be able to roll through a minute gap.

  Further, each of the pillar portions 8 between the pocket portions 5 adjacent to each other in the circumferential direction of the crown type cage 4 is provided with a space portion (concave groove shape) called a meat thinning portion 9, and this meat thinning portion. No. 9 is provided for reasons such as making the thickness of each part of the cage close to the same or reducing the weight of the cage in order to suppress deformation due to uneven resin thickness during resin molding.

  In the case of a crown-shaped resin cage, the meat thinning portion 9 is normally formed at the axial end of the column portion 8 on the side away from the opening 7 (hereinafter referred to as the cage rim side). A trapezoidal shape is formed so as to have a uniform thickness in the vicinity of the opening 7 (see X portion in FIG. 10) and the inner peripheral surface of the pocket portion 5.

JP-A-11-132238 Japanese Utility Model Publication No. 6-8821 JP 2003-35317 A JP-A-7-217659 JP-A-61-215811

  However, in the crown type cage 4 incorporated in the conventional rolling bearing 50, the opening 7 side and the cage rim side have an asymmetric cross-sectional shape in the axial direction. Accordingly, when the rolling bearing 50 is rotated at a high speed such that dmN (dm: average of bearing inner diameter and outer diameter, N: bearing rotation speed) exceeds 800,000, as shown in FIG. The centrifugal force due to the cage rotation (rolling element revolution) acts on the axial end of the cage, and there is a risk of causing torsional deformation due to elasticity or plastic deformation with the axial end on the cage rim side as the torsion axis. There is a strong demand for reduction of the inertial force generated at the axial end of the opening and the increase in rigidity of the cage.

  The present invention has been made to eliminate such inconveniences, and an object of the present invention is to provide a resin cage for a rolling bearing capable of suppressing torsional deformation of the cage during high-speed rotation, and the cage. It is to provide a rolling bearing used.

The above object of the present invention can be achieved by the following constitution.
(1) A pair of claws that hold a plurality of rolling elements of a rolling bearing in a rollable manner and that protrude in the axial direction at pocket portions adjacent to each other in the circumferential direction and at both circumferential ends of the inner peripheral surface of the pocket portion. A ring-shaped resin bearing for a rolling bearing provided with a portion and an opening for inserting a rolling element formed between the pair of claw portions into the pocket portion, A resin cage for a rolling bearing, characterized in that a thinned portion is provided at an axial end on a side away from the opening, and a rib is provided at the thinned portion.
(2) The resin cage for a rolling bearing as set forth in (1), wherein a thinned portion is provided at an axial end of the column portion on the opening side.
(3) The cage made of resin for a rolling bearing according to (1) or (2), characterized in that a thinned portion formed at an end portion in the axial direction on the side away from the opening portion is passed through the pocket portion.
(4) A rolling bearing in which a plurality of rolling elements are arranged between an outer ring and an inner ring so as to be able to roll in the circumferential direction via an annular resin cage, A rolling bearing using the resin-made cage for a rolling bearing according to any one of 1) to (3).

  According to the resin cage for a rolling bearing and the rolling bearing of the present invention, in the column portion between the pocket portions, the thinned portion is provided at the axial end on the side away from the opening portion, and the rib is provided in the thinned portion. Therefore, since the rigidity of the cage can be improved, the torsional deformation of the cage during high-speed rotation can be suppressed.

  Moreover, according to the resin cage for rolling bearing and the rolling bearing of the present invention, since the thinned portion is provided at the axial end on the opening side of the column portion, the axial end on the opening side of the cage is provided. The resulting inertial force can be reduced. Thereby, since the influence of the centrifugal force on the cage can be suppressed, the torsional deformation of the cage during high-speed rotation can be further suppressed.

  Furthermore, according to the resin-made cage for rolling bearing and the rolling bearing of the present invention, the lightened portion of the cage is formed in the axial end portion on the side away from the opening portion, so that the pocket portion is lightened. In addition, since the penetrability of the lubricant inside the bearing can be improved, the lubricating performance and the cooling performance can be improved.

  Hereinafter, embodiments of a resin cage for a rolling bearing and a rolling bearing according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-6, 1st Embodiment of the resin-made cage for rolling bearings and rolling bearing which concerns on this invention is described.
FIG. 1 is a cross-sectional view for explaining a rolling bearing resin cage and a rolling bearing according to the present invention, and FIG. 2 is a portion for explaining a first embodiment of a rolling bearing resin cage according to the present invention. 3 is a perspective view of the rolling bearing resin cage shown in FIG. 2 as viewed from the opening side, and FIG. 4 is a perspective view of the rolling bearing resin cage as shown in FIG. 3 as viewed from the cage rim side. 5 is an enlarged view of a main part of the resin cage for a rolling bearing shown in FIG. 3, and FIG. 6 is an enlarged view of a main part of the resin cage for a rolling bearing shown in FIG.

  As shown in FIG. 1, the rolling bearing 10 of the present embodiment is a deep groove ball bearing in which a plurality of balls 13 serving as rolling elements are disposed between an inner ring 11 and an outer ring 12. It is hold | maintained so that it can roll at the substantially equal interval in the circumferential direction via the crown type resin cage 14 which is the resin cage for rolling bearings of the embodiment.

  The crown-shaped resin cage 14 is a rolling-element-guided crown-shaped cage, and is integrally formed by synthetic resin injection molding or the like. As shown in FIGS. 2 to 4, the crown-shaped resin cage 14 is formed with a pocket portion 15 that holds a plurality of balls 13 so as to be able to roll in the circumferential direction at substantially equal intervals. A pair of claw portions 16 projecting in the axial direction are provided at both ends of the inner peripheral surface in the circumferential direction. An opening 17 is formed between the tips of the pair of claws 16, and the ball 13 is pushed from the opening 17 into the pocket 15 while pushing the pair of claws 16 into the pocket 15. The ball 13 is held so as to be able to roll through a minute gap.

  Further, as shown in FIGS. 2, 4, and 6, each of the pillar portions 18 between the pocket portions 15 adjacent to each other in the circumferential direction of the crown-shaped resin cage 14 is provided with a meat thinning portion 19. ing. The thinned portion 19 is formed at the axial end portion of the pillar portion 18 on the cage rim side, and has a substantially trapezoidal shape so as to be uniform in thickness with the inner peripheral surface of the pocket portion 15. Yes.

  And in this embodiment, while providing the rib 20 in the meat thinning part 19 and dividing | segmenting the space of the meat thinning part 19, as shown in FIG.2, FIG3 and FIG.5, the opening part 17 side of the pillar part 18 is provided. A substantially rectangular thin portion 21 is provided at the end in the axial direction.

  The rib 20 is a pair of axial directions that cross the space portion of the bottom rib 20a disposed on the axial end surface (see the Y portion in FIG. 2) of the column portion 18 on the cage rim side and the thin portion 19 in the axial direction. A rib 20b, and a thinned portion 21 is provided inside the rib 20. The thickness of each rib 20a, 20b is substantially equal to the thickness between the thinned portion 19 and the inner peripheral surface of the pocket portion 15.

  Therefore, according to the rolling bearing resin cage 14 and the rolling bearing 10 of the present embodiment, the thinned portion 19 is provided at the axial end of the column portion 18 between the pocket portions 15 on the side away from the opening portion 17. In addition, since the ribs 20 are provided in the meat thinning portion 19, the rigidity of the cage 14 can be improved, so that the torsional deformation of the cage during high-speed rotation can be suppressed.

  Further, according to the rolling bearing resin cage 14 and the rolling bearing 10 of the present embodiment, since the thinned portion 21 is provided at the axial end portion of the column portion 18 on the opening portion side, the opening portion side of the cage is provided. Inertial force generated at the axial end can be reduced. Thereby, since the influence of the centrifugal force on the retainer 14 can be suppressed, the torsional deformation of the retainer during high-speed rotation can be further suppressed.

  Furthermore, according to the rolling bearing resin cage 14 and the rolling bearing 10 of the present embodiment, the thickness of each rib 20a, 20b is the thickness between the thinned portion 19 and the inner peripheral surface of the pocket portion 15. Therefore, deformation at the time of resin molding can be suppressed similarly to the conventional cage.

(Second Embodiment)
Next, with reference to FIG.7 and FIG.8, 2nd Embodiment of the resin-made cage for rolling bearings and rolling bearing which concern on this invention is described. In addition, about the same or equivalent part as 1st Embodiment, the same code | symbol is attached | subjected to drawing, and the description is abbreviate | omitted or simplified.
FIG. 7 is a perspective view for explaining a second embodiment of the resin cage for a rolling bearing according to the present invention, and FIG. 8 is an enlarged view of a main part of the resin cage for the rolling bearing shown in FIG.

  As shown in FIGS. 7 and 8, the crown-shaped resin cage 24 of the present embodiment has a thinned portion 19 formed at the axial end portion of the column portion 18 on the cage rim side in the pocket portion 15. An opening hole 22 is formed on the inner peripheral surface of the pocket portion 15 so as to penetrate the peripheral surface.

Therefore, according to the rolling bearing resin cage 24 and the rolling bearing 10 of the present embodiment, the pocket portion 15 is penetrated through the thinned portion 19 formed at the axial end of the column portion 18 on the cage rim side. Therefore, the weight of the cage 24 can be reduced, and the penetrability of the lubricant inside the bearing can be improved, so that the lubrication performance and the cooling performance can be improved.
About another structure and an effect, it is the same as that of 1st Embodiment mentioned above.

In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above-described embodiment, the case where the present invention is applied to a crown-shaped resin cage for a cage guide is illustrated, but the present invention is not limited to this, and the present invention is applied to a rolling element guide or a bearing guide for a bearing ring. May be applied.

  The configurations of the rolling element, pocket portion, claw portion, opening portion, column portion, meat thinning portion, rib, outer ring, inner ring, cage, etc. of the present invention are not limited to the above embodiment, but the present invention. The present invention can be changed as appropriate without departing from the gist of the invention.

It is sectional drawing for demonstrating the resin-made cage for rolling bearings and rolling bearing which concern on this invention. It is a partial expanded view for demonstrating 1st Embodiment of the resin cage for rolling bearings which concerns on this invention. It is the perspective view which looked at the resin-made cage for rolling bearings shown in FIG. 2 from the opening part side. It is the perspective view which looked at the resin-made cage for rolling bearings shown in FIG. 3 from the cage rim side. It is a principal part enlarged view of the resin-made cage for rolling bearings shown in FIG. It is a principal part enlarged view of the resin-made cage for rolling bearings shown in FIG. It is a perspective view for demonstrating 2nd Embodiment of the resin cage for rolling bearings which concerns on this invention. It is a principal part enlarged view of the resin-made cage for rolling bearings shown in FIG. It is sectional drawing for demonstrating the rolling bearing incorporating the conventional crown type resin cage. FIG. 10 is a partial development view for explaining the crown-shaped resin cage shown in FIG. 9. It is the perspective view which looked at the crown type resin cage shown in FIG. 10 from the opening side. It is the perspective view which looked at the crown type resin cage shown in FIG. 11 from the cage rim side. It is principal part sectional drawing for demonstrating the twist deformation | transformation which arises in the conventional crown type resin cage.

Explanation of symbols

10 Rolling bearings 11 Inner ring 12 Outer ring 13 Ball (rolling element)
14,24 Crown type resin cage (resin cage for rolling bearings)
DESCRIPTION OF SYMBOLS 15 Pocket part 16 Nail | claw part 17 Opening part 18 Column part 19 Thickening part 20 Rib 21 Thickening part 22 Opening hole

Claims (4)

A plurality of rolling elements of the rolling bearing are rotatably held, a pocket portion adjacent to each other in the circumferential direction, and a pair of claw portions protruding in the axial direction at both circumferential ends of the inner peripheral surface of the pocket portion, An annular rolling bearing resin retainer comprising: an opening for inserting the rolling element formed between the pair of claws into the pocket portion;
A rolling cage resin cage, wherein a pillar portion between the pocket portions is provided with a thinned portion at an axial end on a side away from the opening, and a rib is provided at the thinned portion.   The resin cage for a rolling bearing according to claim 1, wherein a thinned portion is provided at an end portion in the axial direction of the column portion on the opening side.   3. The resin cage for a rolling bearing according to claim 1, wherein the thinned portion formed at an axial end on the side away from the opening is passed through the pocket portion. 4. A rolling bearing in which a plurality of rolling elements are arranged between an outer ring and an inner ring so as to be able to roll in a circumferential direction via an annular resin cage,
A rolling bearing using the resin cage for a rolling bearing according to any one of claims 1 to 3 as the resin cage.

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