JP2015197186A - rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of preventing slipping-out of a retainer made of a synthetic resin.SOLUTION: In a roller bearing including an outer ring 1, an inner ring 2 coaxially disposed to the outer ring 1, a plurality of rolling elements 3 rollably disposed between the outer ring 1 and the inner ring 2, and a retainer 4 provided with pocket portions for rollably retaining the rolling elements 3. The retainer 4 has an annular main portion 4a, and a plurality of claw portions 4b arranged substantially at equal intervals in the circumferential direction on an axial end portion of the main portion 4a and projecting in the axial direction, and the pocket portions are formed by the pair of claw portions 4b and the main portion, an engagement groove 1b continued in the circumferential direction is formed on a position opposed to the axial end portion of the claw portions 4b, of an inner periphery of the outer ring 1, the retainer 4 is made of a synthetic resin, and the claw portions 4b have the elastic deformation function deforming radially outward, so that the claw portions 4b are elastically deformed radially outward and the axial end portions of the claw portions 4b are engaged with the engagement groove 1b when the claw portions 4b receive force in the tangential direction of the rolling elements 3 in the rotating direction.

Description

  The present invention relates to a rolling bearing provided with a synthetic resin cage.

  An example of a conventional rolling bearing is shown in FIG. The rolling bearing includes an outer ring 11 having an outer ring raceway surface 11a on the inner peripheral surface, an inner ring 12 arranged coaxially with the outer ring 11 and having an inner ring raceway surface 12a on the outer peripheral surface, and between the outer ring raceway surface 11a and the inner ring raceway surface 12a. A plurality of rolling elements that are arranged so as to be capable of rolling, a cage 14 that holds the plurality of balls 13 so as to be capable of rolling at equal intervals in the circumferential direction, and axially opposite sides of the outer ring 11. A seal 17 is provided on the inner peripheral surface and is in sliding contact with the outer peripheral surfaces on both axial sides of the inner ring 12. The rolling bearing seals a lubricant that lubricates the rolling elements 13, the outer ring raceway surface 11a, and the inner ring raceway surface 12a.

  The cage 14 has an annular main portion 15 and claw portions 16 extending in the axial direction from one axial end portion of the main portion 15 and arranged at a plurality of positions at equal intervals in the circumferential direction. Between the pair of claw portions 16 and 16 adjacent to each other in the circumferential direction, a pocket portion that holds the ball 13 in a rollable manner is formed. The example shown in FIG. 5 is a ball guidance method in which the cage 14 is guided and supported by the balls 13.

Here, due to the inclination of the inner and outer rings of the bearing, thermal expansion during rotation, and centrifugal force during rotation, the claw portion 16 is deformed radially outward, and the gap between the pair of claw portions 16 extends beyond the diameter of the ball 13. Then, there is a possibility that the cage 14 comes out of the ball 13. In order to eliminate such inconveniences, Patent Document 1 proposes that a seal 17 is provided at the end of the outer ring 11 on the main portion 15 side, and that the retainer 14 is prevented from coming off by the seal 17.
(For example, refer to Patent Document 1).

JP-A 63-92819

  For this reason, it is necessary to consider the position of the seal 17 with respect to the cage 14, and it is necessary to consider the strength of the seal 17 that can withstand the pressing of the cage 14.

  The present invention has been made to eliminate such inconveniences, and an object of the present invention is to prevent the retainer made of synthetic resin from coming off without considering the position of the seal 17 and the strength of the seal 17. It is to provide a rolling bearing that can be used.

  In order to achieve the above object, an outer ring, an inner ring arranged coaxially with respect to the outer ring, a plurality of rolling elements arranged to roll between the outer ring and the inner ring, and the rolling element A retainer having a pocket portion that is movably retained, and the retainer includes a ring-shaped main portion and a plurality of shafts arranged at substantially equal intervals in a circumferential direction at an axial end portion of the main portion. A rolling bearing having a pair of the claw portions and the main portion forming the pocket portion, and a position facing the axial end of the claw portion on the inner periphery of the outer ring Thus, a continuous engagement groove is formed in the circumferential direction, the cage is made of synthetic resin, and the claw portion receives the tangential force in the rotational direction of the rolling element when the claw portion receives the force. Is elastically deformed radially outward, and the axial end of the claw is engaged with the engagement groove. It is a fact.

  According to the above configuration, when the claw portion receives a tangential force in the rotational direction of the rolling element, the claw portion is elastically deformed in the bending direction, and the axial end portion of the claw portion is formed in the engagement groove of the outer ring. Engage. As a result, it is possible to prevent the cage made of synthetic resin from coming off without considering the position of the seal relative to the cage and without considering the strength of the seal that can withstand the pressing of the cage.

  Furthermore, in the invention according to claim 2, the claw portion has a bifurcated portion divided on both sides in the circumferential direction toward the axial end portion, and the tangential force in the rotational direction of the rolling element is The gist is that when the bifurcated portion is received, the bifurcated portion is easily elastically deformed radially outward, and the axial end portion of the bifurcated portion is engaged with the engaging groove.

  According to the above configuration, when the claw portion receives a tangential force in the rotational direction of the rolling element, the claw portion, particularly the bifurcated portion, is greatly elastically deformed, and the axial end of the bifurcated portion is the outer ring. It becomes easy to engage with the engaging groove. As a result, the movement of the cage in the axial direction can be more reliably regulated by making the claw portion of the cage easily interfere with the engagement groove. Therefore, it is possible to prevent the cage made of synthetic resin from coming off.

  ADVANTAGE OF THE INVENTION According to this invention, even if it does not consider the position of a seal | sticker and the intensity | strength of a seal | sticker, the rolling bearing which can prevent the retainer made from a synthetic resin can be provided.

Sectional drawing of the rolling bearing which concerns on one Embodiment of this invention. The perspective view of the holder | retainer of the rolling bearing which concerns on one Embodiment of this invention. The B direction arrow directional view (seal removal) of Drawing 2 concerning one embodiment of the present invention. Sectional drawing of a rolling bearing when the nail | claw part which concerns on one Embodiment of this invention deform | transforms elastically. Sectional drawing of the conventional rolling bearing.

Hereinafter, a rolling bearing according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view for explaining a rolling bearing according to an embodiment of the present invention, and FIG. 2 is a perspective view of a cage in the rolling bearing shown in FIG.

  As shown in FIG. 1, the rolling bearing A of this embodiment includes an outer ring 1 having an outer ring raceway surface 1 a on an inner peripheral surface, and an inner ring 2 having an inner ring raceway surface 2 a on an outer peripheral surface and disposed coaxially with the outer ring 1. And a plurality of balls (rolling elements) 3 disposed so as to be able to roll between the outer ring raceway surface 1a and the inner ring raceway surface 2a, and holding the plurality of balls 3 so that they can roll at equal intervals in the circumferential direction. A cage 4 made of synthetic resin.

  As shown in FIG. 2, the retainer 4 includes an annular main portion 4 a and a plurality of claw portions 4 b that are arranged at equal intervals in the circumferential direction at one axial end portion of the main portion 4 a and project in the axial direction. And a pair of claw portions 4b, 4b and a main portion 4a form a pocket portion 4c that holds the ball 3 in a rollable manner. The claw portion 4b has a bifurcated portion 4f that is divided on both sides in the circumferential direction toward the axial end portion, and the bifurcated portion 4f is a pair of small claw portions that are spaced apart from each other in the circumferential direction toward the axial end portion. 4d and 4d and a slit 4e between the pair of small claw portions 4d and 4d. The pair of small claw portions 4 d and 4 d are curved along the ball 3. The claw portion 4b has elasticity that bends in the outer diameter direction. The small claw portion 4d that is thin in the circumferential direction by the amount of the slit 4e is likely to be greatly bent in the outer diameter direction.

  Synthetic resin materials forming the cage 4 include polyamide resins such as 46 nylon and 66 nylon, polybutylene terephthalate, polyphenylene sulfide (PPS), polyamide imide (PAI), thermoplastic polyimide, polyether ether ketone (PEEK). And polyether nitrile (PEN). In addition, the rigidity and dimensional accuracy of the cage 4 can be improved by appropriately adding, for example, 10 to 50% by weight of a fibrous filler such as glass fiber or carbon fiber to the above-described synthetic resin.

  In the outer ring 1 of FIG. 1, the pair of small claw portions 4 d and 4 d are elastically deformed radially outward at positions facing the pair of small claw portions 4 d and 4 d of the bifurcated portion 4 f of the claw portion 4 b of the cage 4. An engaging groove 1b having a rectangular cross section that is continuous in the circumferential direction is sometimes formed. An annular recess 1c is formed along the circumferential direction on the inner peripheral surfaces of both ends of the outer ring 1 in the axial direction. An annular recess 2b is formed along the circumferential direction on the inner circumferential surface at both axial ends of the inner ring 2.

  The outer periphery of the seal 7 is fitted and fixed to the annular recess 1 c of the outer ring 1, and the inner periphery of the seal 7 is in sliding contact with the annular recess 2 b of the inner ring 12. The seal 7 has a function of sealing between the outer ring 1 and the inner ring 2. The seal 7 may be a shield plate made of iron, steel, spring steel, or a metal core made of iron, steel, spring steel and vulcanized and bonded to a rubber material. A lubricant is sealed between the outer ring raceway surface 1a and the inner ring raceway surface 2a, and the lubricant between the rolling elements 3, the outer ring raceway surface 1a and the inner ring raceway surface 2a is performed with the lubricant.

  Next, the behavior of the cage 4 of the rolling bearing A will be described with reference to FIG. FIG. 3 shows a view in the direction of arrow B (seal removal) in FIG. 2 according to an embodiment of the present invention. FIG. 4 is a sectional view of the rolling bearing when the claw portion 4b according to the embodiment of the present invention is elastically deformed.

An example in which the inner ring 2 is fixed, the outer ring 1 rotates, and a vertical load is applied to the outer ring 1 in the vertical direction in FIG. When the outer ring 1 rotates, the balls 3 move in the same direction as the outer ring 1 while rolling on the outer ring raceway surface 1a and the inner ring raceway surface 2a. The cage 4 moves together with the balls 3 in the same direction as the outer ring 1. A load that presses against the inner ring 2 via the ball 3 is acting on the upper part of the outer ring 1. When the ball 3 comes to the upper part of the outer ring 1, the ball 3 is subjected to the above-described load, so that the lead 3 is delayed. When passing the upper part of the outer ring 1, the ball 3 is excessively advanced because it receives the load. That is, a force in a direction opposite to the moving direction of the ball 3 acts on the ball 3 approaching the upper part of the outer ring 1, and this force F increases as the upper part of the outer ring 1 is approached. A force in the same direction as the moving direction of the ball 3 is applied to the ball 3 moving away from the upper part of the outer ring 1, and this force F becomes smaller as it moves away from the upper part of the outer ring 1. The cage 4 rotates as a unit despite the advance and delay of the ball 3 and the advance of the ball 3, so that force is applied to the claw portion 4 b of the cage 4 sandwiched between the balls 3 and 3. f is acting. The force F is a tangential force passing through the center of the ball 3. The force f is a force passing through the contact point between the ball 3 and the cage 4. Since there is an angular difference between the force F and the force f, this is the radial force N.
The claw portion 4b that is curved along the ball 3 has elasticity to bend in the outer diameter direction by the radial force N. Since the claw portion 4b is easily bent greatly in the outer diameter direction, it is elastically deformed in the outer diameter direction.

Further, due to thermal expansion and centrifugal force during rotation, the claw portion 4b of the cage 4 is directly subjected to a bending force in the radially outward direction with the main portion 4a of the cage as a fulcrum, so that the claw portion 4b of the cage has a radius. In some cases, it may be elastically deformed outward in the direction.
The claw portion 4b protruding in the axial direction of the cage 4 has a bifurcated portion 4f that is divided on both sides in the circumferential direction toward the axial end portion, and the bifurcated portion 4f is circumferentially directed toward the axial end portion. Are provided with a pair of small claw portions 4d and 4d which are spaced apart from each other and a slit 4e between the pair of small claw portions 4d and 4d. Furthermore, the small claw portion 4d that is thin in the circumferential direction by the amount of the slit 4e is likely to be greatly bent in the outer diameter direction.

  Therefore, according to the rolling bearing A of the present embodiment, the claw portion 4b protruding in the axial direction of the cage 4 has an elastic deformation function of deforming outward in the radial direction, and the tangential force in the rotation direction of the ball 3 When received, the end of the claw portion 4b in the axial direction is easily elastically deformed radially outward.

  According to the above configuration, when the claw portion 4b receives a tangential force in the rotational direction of the rolling element, the claw portion 4b is elastically deformed in the bending direction, and the axial end portion of the claw portion 4b is the outer ring 1. Engages with the engaging groove 1b. As a result, when a tangential force in the rotational direction of the ball 3 is applied, the claw portion 4b protruding in the axial direction is elastically deformed radially outward and engages with the engagement groove 1b on the inner periphery of the outer ring 1. Therefore, the axial movement of the cage 4 can be restricted without considering the position of the seal 7 and the strength of the seal 7, and the synthetic resin cage 4 can be prevented from coming off.

  Further, the claw portion 4b protruding in the axial direction of the cage 4 has a bifurcated portion 4f that is divided on both sides in the circumferential direction toward the axial end portion, and the bifurcated portion 4f is circular toward the axial end portion. It has a pair of small claw parts 4d and 4d spaced apart from each other in the circumferential direction, and a slit 4e between the pair of small claw parts 4d and 4d. And a pair of small nail | claw parts 4d and 4d curve along the ball | bowl 3, and the nail | claw part 4b has the elastic function bent in an outer-diameter direction. Therefore, the small claw portion 4d that is thin in the circumferential direction by the amount of the slit 4e is easily bent greatly in the outer diameter direction. As a result, when a tangential force in the rotational direction of the ball 3 is applied, the small claw portion 4d of the claw portion 4b protruding in the axial direction is elastically deformed radially outward, and the engagement groove 1b on the inner periphery of the outer ring 1 Engage with. Therefore, the axial movement of the cage 4 can be restricted without considering the position of the seal 7 and the strength of the seal 7, and the synthetic resin cage 4 can be prevented from coming off.

  According to the above configuration, when the claw 4b receives a tangential force in the rotational direction of the ball 3, the claw 4b, particularly the bifurcated portion 4f, is greatly elastically deformed and the axial direction of the bifurcated portion 4f. The end portion is easily engaged with the engagement groove 1 b of the outer ring 1. As a result, the movement of the retainer 4 in the axial direction can be more reliably restricted by making the claw portion 4b of the retainer 4 easily interfere with the engagement groove 1b. Therefore, it is possible to prevent the cage 4 made of synthetic resin from coming off without considering the position of the seal 7 and the strength of the seal 7.

  In addition, this invention is not limited to what was illustrated by one Embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

A: Rolling bearing, 1: Outer ring, 1a: Outer ring raceway surface, 2: Inner ring,
2a: inner ring raceway surface, 3: ball (rolling element), 4: cage, 4a: main part,
4b: nail part, 4c: pocket part, 4d: small nail part, 4e: slit part,
4f: Fork, 7: Seal

Claims (2)

  An outer ring, an inner ring disposed coaxially with respect to the outer ring, a plurality of rolling elements disposed so as to be able to roll between the outer ring and the inner ring, and a pocket portion that holds the rolling element in a rollable manner. The retainer includes an annular main portion, and a plurality of claw portions that are arranged at substantially equal intervals in the circumferential direction at the axial end portion of the main portion and project in the axial direction. In the rolling bearing in which the pocket portion is formed by the pair of the claw portion and the main portion, the inner periphery of the outer ring is continuous in the circumferential direction at a position facing the axial end portion of the claw portion. An engagement groove is formed, the cage is made of synthetic resin, and the claw portion is elastically deformed radially outward when it receives a tangential force in the rotational direction of the rolling element. The rolling bearing is characterized in that the axial end of the claw engages with the engaging groove.   The claw portion has a bifurcated portion divided on both sides in the circumferential direction toward the axial end portion, and the bifurcated portion when the bifurcated portion receives a tangential force in the rotational direction of the rolling element. 2. The rolling bearing according to claim 1, wherein the shaft is elastically deformed radially outward and the axial end of the bifurcated portion is engaged with the engagement groove.

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