JP2007315575A - Ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball bearing, restraining a crow type cage from being tilted to the outer ring side during high-speed rotation and in a high-temperature environment. <P>SOLUTION: In this ball bearing 10, a reinforcement part 20 is provided between a cage bar part 18 and a claw part 16 disposed between pocket parts 15 adjacent to each other in the circumferential direction of the crown-type cage 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ball bearing in which a crown type cage is incorporated, and more particularly to a ball bearing used in an environment under high temperature, high load, and high speed rotation.

  As a conventional ball bearing, a ball bearing as shown in FIG. 9 is known. This ball bearing is rolled between a double row inner ring raceway surface 1 a of the inner ring 1 and a double row outer ring raceway surface 2 a of the outer ring 2. A plurality of balls 3 as moving bodies are arranged. The plurality of balls 3 are held so as to be able to roll at substantially equal intervals in the circumferential direction via an annular crown-shaped cage 4.

  The crown-shaped cage 4 is generally formed by injection molding of synthetic resin in consideration of the seizure life of grease. As shown in FIG. 10, the crown-type cage 4 is formed with a pocket portion 5 that holds a plurality of balls 3 so as to be able to roll in the circumferential direction at substantially equal intervals. A pair of claw portions 6 projecting in the axial direction are provided at both ends in the circumferential direction. 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, as part of the countermeasure against the seizing life of the grease, as shown in FIG. 11, by forming the spherical portion 5a and the cylindrical portion 5b on the inner peripheral surface of the pocket portion 5 of the crown type cage 4, A technique has been proposed in which grease can easily enter between the balls 3 (see, for example, Patent Document 1).

JP 2002-310161 A

  However, the crown type cage 4 incorporated in the conventional ball bearing is a ball guide type cage, and since the opening 7 side and the cage rim side have an asymmetric cross-sectional shape in the axial direction, In response to higher speed rotation, centrifugal force due to cage rotation (rolling element revolution) acts on the axial end on the opening 7 side, and elasticity or plasticity using the axial end on the cage rim side as a torsion axis Torsional deformation due to the deformation occurs, and the collapse of the crown-shaped cage 4 toward the outer ring 2 on the opening 7 side becomes large. This fall is more noticeable as the temperature is higher and the rotational speed is faster, especially for rotating outer rings such as electromagnetic clutch bearings, idler pulley bearings, tensioner pulley bearings, etc. used in engine accessory parts such as automobiles. The amount of the crown-type cage 4 falling toward the outer ring 2 becomes larger.

  When the crown type cage 4 is greatly tilted toward the outer ring 2 side, the crown type cage 4 comes into contact with the groove shoulder of the outer ring 2 to generate heat, and the rotation of the cage is restricted. Sliding occurs between the pocket portion 5 and the lubrication state is deteriorated, which causes the seizure to be promoted. Even if an appropriate clearance is secured between the crown-shaped cage 4 and the groove shoulder of the outer ring 2, the amount of movement of the crown-shaped cage 4 is small due to the crown-shaped cage 4 falling to the outer ring 2 side. Therefore, the deformation and wear of the crown type cage 4 are increased, and the radial movement of the crown type cage 4 is increased, so that the lubrication state of the bearing is deteriorated and seizure occurs. Could occur.

  The present invention has been made to eliminate such inconveniences, and an object of the present invention is to provide a ball bearing that can prevent the crown type cage from falling to the outer ring side in a high-speed rotation and high-temperature environment. There is to do.

The above object of the present invention can be achieved by the following constitution.
(1) An outer ring having an outer ring raceway surface on the inner peripheral surface, an inner ring having an inner ring raceway surface on the outer peripheral surface, and a roll-type cage disposed between the inner ring raceway surface and the outer ring raceway surface. The crown-shaped cage holds the plurality of balls so as to be able to roll, and the pocket portions adjacent to each other in the circumferential direction and the circumferential end portions of the inner peripheral surface of the pocket portion. A ball bearing having a pair of claws projecting in an axial direction and an opening for inserting a ball into a pocket formed between the pair of claws, the circumference of the crown type cage A ball bearing comprising a reinforcing portion provided between a column portion and a claw portion disposed between pocket portions adjacent to each other in the direction.
(2) The ball bearing according to (1), wherein the reinforcing portion is provided at a base of the claw portion.
(3) The ball bearing according to (1), wherein the reinforcing portion is provided from the tip of the claw portion to the base.

  According to the ball bearing of the present invention, the reinforcing portion is provided between the column portion and the claw portion that are arranged between the pocket portions adjacent to each other in the circumferential direction of the crown type cage. Even if the crown-type cage is about to fall to the outer ring side by using, the rigidity of the cage is improved by the reinforcing portion, so that the crown-type cage can be prevented from falling to the outer ring side.

Hereinafter, an embodiment of a ball bearing according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view for explaining an embodiment of a ball bearing according to the present invention, FIG. 2 is a view for explaining a crown type cage incorporated in the ball bearing shown in FIG. 1, and (a) is a crown type. The partial expanded view which looked at the cage | basket from the radial direction outer side, (b) is the top view which looked at the crown type cage shown to (a) from the opening part side, (c) is an AA line arrow view of (a). It is sectional drawing.

  As shown in FIG. 1, the ball bearing 10 of the present embodiment is a double row ball bearing, an inner ring 11 having double row inner ring raceway surfaces 11a and 11a on the outer peripheral surface, and a double row outer ring on the inner peripheral surface. An outer ring 12 having raceway surfaces 12a, 12a, and a plurality of balls 13 disposed so as to be able to roll between the inner ring raceway surfaces 11a, 11a and the outer ring raceway surfaces 12a, 12a via a crown-shaped cage 14. Is provided. Further, seal members 22 are respectively attached to the seal grooves 21 formed at the axial ends of the inner peripheral surface of the outer ring 12.

  The crown type cage 14 is formed by injection molding of a synthetic resin or the like. As the resin material of the crown type resin cage 14, polyamide resin such as 46 nylon or 66 nylon, polybutylene terephthalate, polyferene sulfide ( Examples thereof include PPS), polyamideimide (PAI), thermoplastic polyimide, polyetheretherketone (PEEK), and polyethernitrile (PEN). Further, the rigidity and dimensional accuracy of the cage can be improved by appropriately adding 10 to 50% by weight of a fibrous filler (for example, glass fiber or carbon fiber) to these resins.

  Further, as shown in FIG. 2, 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 formed at both ends in the circumferential direction of the inner peripheral surface of 15. Further, an opening 17 is formed between the tips of the pair of claws 16, and the ball 13 is pushed into the pocket 15 while expanding the pair of claws 16 from the opening 17. The ball 13 is held so as to be able to roll through a minute gap.

  Further, space portions (concave groove shapes) called flesh thinning portions 19 are formed in the column portions 18 between the pocket portions 15 adjacent to each other in the circumferential direction of the crown-shaped cage 14, and the flesh thinning portions are formed. No. 19 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 type retainer, the meat thinning portion 19 is usually formed at the axial end of the column 18 on the side (rim side) away from the opening 17, and the axial end surface of the column 18 and the pocket 15. A substantially trapezoidal shape is formed so as to have a uniform wall thickness on the inner peripheral surface.

  And in this embodiment, as shown in FIG. 2, the reinforcement part 20 which consists of a convex part is integrated between the axial direction end surface by the side of the nail | claw part 16 of the pillar part 18, and the nail | claw part 16 (base of the nail | claw part 16). Formed. The reinforcing portion 20 has a substantially square shape (see FIG. 2A) when the crown-shaped cage 14 is viewed from the radial direction, and a substantially square shape when viewed from the axial direction (see FIG. 2B). And it is formed in the substantially square shape (refer FIG.2 (c)) in the state seen from the circumferential direction. The reinforcing portion 20 is disposed on the inner side of the radial center line 23 of the crown-shaped cage 14 and is formed so as to be flush with the inner peripheral surface of the crown-shaped cage 14.

  As described above, according to the ball bearing 10 of the present embodiment, the reinforcing portion is provided between the column portion and the claw portion 16 that are disposed between the pocket portions 15 adjacent to each other in the circumferential direction of the crown type cage 14. 20 is provided, the rigidity of the retainer 14 is improved by the reinforcing portion 20 even if the crown retainer 14 is about to fall to the outer ring 12 side due to high-speed rotation and use in a high temperature environment. 14 to the outer ring 12 side can be suppressed.

  As a first modification of the crown-type cage 14 of the present embodiment, as shown in FIG. 3, the reinforcing portion 20 has a substantially square shape (see FIG. 3 ( a) and a substantially square shape (see FIG. 3B) when viewed from the axial direction, and a substantially triangular shape (see FIG. 3C) when viewed from the circumferential direction. Good.

  Further, as a second modification of the crown-type cage 14 of the present embodiment, as shown in FIG. 4, the reinforcing portion 20 has a substantially triangular shape (see FIG. 4 (FIG. 4 ( a) and a substantially square shape (see FIG. 4B) when viewed from the axial direction, and a substantially square shape (see FIG. 4C) when viewed from the circumferential direction. Good.

  As a third modification of the crown type cage 14 of the present embodiment, as shown in FIG. 5, the reinforcing portion 20 has a substantially triangular shape (see FIG. 5 ( a) and a substantially triangular shape (see FIG. 5B) when viewed from the axial direction, and a substantially triangular shape (see FIG. 5C) when viewed from the circumferential direction. Good.

  Further, as a fourth modification of the crown type cage 14 of the present embodiment, as shown in FIG. 6, the reinforcing part 20 may be provided from the tip of the claw part 16 to the root. In this modification, The crown-shaped cage 14 is substantially triangular (see FIG. 6 (a)) when viewed from the radial direction, and is substantially rectangular (see FIG. 6 (b)) when viewed from the axial direction, and from the circumferential direction. It is formed in a substantially rectangular shape (see FIG. 6C) when viewed.

  Further, as a fifth modification of the crown type cage 14 of the present embodiment, as shown in FIG. 7, the reinforcing part 20 may be provided from the tip of the claw part 16 to the root. In this modification, The crown-shaped cage 14 is substantially triangular (see FIG. 7A) when viewed from the radial direction, and is substantially triangular (see FIG. 7B) when viewed from the axial direction, and from the circumferential direction. It is formed in a substantially triangular shape (see FIG. 7C) when viewed.

  Further, as a sixth modified example of the crown type cage 14 of the present embodiment, as shown in FIG. 8, the reinforcing portion 20 may be provided from the tip of the claw portion 16 to the root, and in this modified example, The crown-shaped cage 14 is substantially trapezoidal (see FIG. 8A) when viewed from the radial direction, and is substantially rectangular (see FIG. 8B) when viewed from the axial direction, and from the circumferential direction. It is formed in a substantially rectangular shape (see FIG. 8C) when viewed.

It is sectional drawing for demonstrating one Embodiment of the ball bearing which concerns on this invention. It is a figure explaining the crown type retainer integrated in the ball bearing shown in FIG. 1, (a) is the partial expanded view which looked at the crown type retainer from the radial direction outer side, (b) is the crown type shown in (a). The top view which looked at the holder | retainer from the opening part side, (c) is the sectional view on the AA line of (a). It is a figure explaining the 1st modification of the crown type cage shown in Drawing 2, (a) is a partial development view which looked at a crown type cage from the diameter direction outside, and (b) is a crown type shown in (a). The top view which looked at the holder | retainer from the opening part side, (c) is BB arrow sectional drawing of (a). It is a figure explaining the 2nd modification of the crown type cage shown in Drawing 2, (a) is a partial development view which looked at a crown type cage from the diameter direction outside, and (b) is a crown type shown in (a). The top view which looked at the holder | retainer from the opening part side, (c) is CC sectional view taken on the line of (a). It is a figure explaining the 3rd modification of the crown type cage shown in Drawing 2, (a) is a partial development view which looked at a crown type cage from the diameter direction outside, and (b) is a crown type shown in (a). The top view which looked at the holder | retainer from the opening part side, (c) is the DD sectional view taken on the line of (a). It is a figure explaining the 4th modification of the crown type cage shown in Drawing 2, (a) is a partial development view which looked at a crown type cage from the diameter direction outside, and (b) is a crown type shown in (a). The top view which looked at the holder | retainer from the opening part side, (c) is the EE arrow directional cross-sectional view of (a). It is a figure explaining the 5th modification of the crown type cage shown in Drawing 2, (a) is a partial development view which looked at a crown type cage from the diameter direction outside, and (b) is a crown type shown in (a). The top view which looked at the holder | retainer from the opening part side, (c) is FF arrow directional cross-sectional view of (a). It is a figure explaining the 6th modification of the crown type cage shown in Drawing 2, (a) is a partial development view which looked at a crown type cage from the diameter direction outside, and (b) is a crown type shown in (a). The top view which looked at the cage | basket from the opening part side, (c) is GG arrow sectional drawing of (a). It is sectional drawing for demonstrating the conventional ball bearing. It is a perspective view for demonstrating the conventional crown type holder | retainer integrated in the ball bearing of FIG. It is a fragmentary perspective view for demonstrating the other conventional crown type holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ball bearing 11 Inner ring 11a Inner ring raceway surface 12 Outer ring 12a Outer ring raceway surface 13 Ball 14 Crown type cage 15 Pocket part 16 Claw part 17 Opening part 18 Column part 19 Thickening part 20 Reinforcement part 21 Seal groove 22 Seal member 23 Centerline

Claims (3)

An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a roll-type cage disposed between the inner ring raceway surface and the outer ring raceway surface. With multiple balls,
The crown-shaped cage is configured to hold the plurality of balls in a rollable manner, and are protruded in the axial direction at pocket portions adjacent to each other in the circumferential direction and at both circumferential ends of the inner circumferential surface of the pocket portion. A ball bearing having a pair of claw portions and an opening portion formed between the pair of claw portions and for inserting the ball into the pocket portion,
A ball bearing, wherein a reinforcing portion is provided between a pillar portion and the claw portion disposed between the pocket portions adjacent to each other in the circumferential direction of the crown type cage.   The ball bearing according to claim 1, wherein the reinforcing portion is provided at a base of the claw portion.   The ball bearing according to claim 1, wherein the reinforcing portion is provided from a tip to a root of the claw portion.

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