JP2009068636A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing capable of reducing friction and torque by allowing a lubricant to easily enter a bearing space, and of restraining a heating value. <P>SOLUTION: This rolling bearing 10 is provided with a resin cage 14 retaining a plurality of rolling elements 13 rollingly arranged between the raceway surface 11a of an outer ring 11 and the raceway surface 12a of an inner ring 12 at nearly-equal intervals in the circumferential direction. The cage 14 includes a pair of annular parts 15a and 15b arranged axially separately from each other, and a plurality of columns 16 circumferentially arranged between the pair of annular parts 15a and 15b, and connecting the pair of annular parts 15a and 15b to each other, and has pockets 17 holding the rolling elements formed between the columns 16 adjacent to each other in the circumferential direction. The cage 14 is divided, in the axial direction, into two parts which are fitted to each other at a dividing position, and a flange 18 capable of contacting with the outer ring 11 is formed only at the axial end of the cage 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing used for a rotating part of, for example, an automobile transmission or an industrial machine.

  In general, a rolling bearing is composed of an outer ring and an inner ring each having raceways facing each other in the radial direction, a plurality of balls interposed between the outer ring raceway surface and the inner ring raceway surface, and a plurality of balls. And a cage that is held so as to be able to roll at equal intervals in the circumferential direction.

  In recent years, resin cages are often used because of the need for weight reduction, low torque, and high speed, and in order to cope with a higher speed range, for example, the cage is made axially. An outer ring guide system is formed by dividing and engaging with each other at the dividing position and providing flange portions that can contact the outer ring at both axial ends of the cage (see, for example, Patent Document 1), or resin There has been proposed an outer ring guide system in which an outer peripheral surface of the retainer is disposed in proximity to an inner peripheral surface of an outer ring using a crown-shaped cage made of metal (see, for example, Patent Document 2).

JP-A-8-277842 JP 2002-295480 A

  However, in Patent Document 1, since the flange portions are provided at both ends in the axial direction of the cage, the occupied volume of the cage with respect to the bearing space between the inner and outer rings is increased, and it is difficult for lubricating oil to enter the bearing space. As a result, low friction and low torque are hindered. In addition, since flanges are provided at both ends in the axial direction of the cage and are in contact with the outer ring, the guide surface increases and the amount of heat generated by friction increases. Since the rotational speed of the bearing is also high, there is a problem that the amount of heat generation is further increased.

  Moreover, in the said patent document 2, since the clearance gap between the outer peripheral surface of a holder | retainer and the inner peripheral surface of an outer ring | wheel is small, there exists a problem that lubricating oil is hard to be discharged | emitted from the inside of a bearing and a favorable lubrication effect is not acquired.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to make it easier for the lubricant to enter the bearing space to reduce friction and torque, and to reduce the amount of heat generated. It is to provide a rolling bearing that can be used.

The object of the present invention described above is achieved by the following configuration.
(1) 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 plurality of rolling elements arranged to be rollable between the outer ring raceway surface and the inner ring raceway surface; A retainer made of resin that holds a plurality of rolling elements at substantially equal intervals in the circumferential direction, and the retainer includes a pair of annular portions spaced apart from each other in the axial direction, and a pair of annular portions A plurality of circumferentially disposed intermediate portions, and a column portion that connects the pair of annular portions, and a pocket portion that holds a rolling element between the adjacent column portions in the circumferential direction is formed. A bearing,
The cage is divided into two parts in the axial direction, and is fitted to the concave and convex portions at the divided position, and a flange part capable of contacting the outer ring is provided only at one end part in the axial direction of the cage. bearing.

  According to the rolling bearing of the present invention, since the flange portion that can contact the outer ring is provided only at one end in the axial direction of the cage, the occupied volume of the cage with respect to the bearing space between the inner and outer rings is reduced. Lubricating oil easily enters the bearing space.

  As a result, low friction and low torque can be achieved, and the flange portion provided only at one end in the axial direction of the cage comes into contact with the outer ring, thereby suppressing the amount of heat generated by friction. Can do.

Hereinafter, an embodiment of a rolling bearing according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an essential part for explaining an embodiment of a rolling bearing according to the present invention, FIG. 2 is a perspective view for explaining a resin cage incorporated in the rolling bearing shown in FIG. FIG. 4 and FIG. 5 are main part cross-sectional views for explaining a modification of one embodiment of the rolling bearing according to the present invention. FIG.

  As shown in FIG. 1, the rolling bearing 10 of this embodiment includes an outer ring 11 having an outer ring raceway surface 11a on an inner peripheral surface, an inner ring 12 having an inner ring raceway surface 12a on an outer peripheral surface, an outer ring raceway surface 11a and an inner ring raceway. A plurality of rolling elements 13 disposed so as to be able to roll between the surface 12a and a resin cage 14 that holds the plurality of rolling elements 13 at equal intervals in the circumferential direction. .

  As shown in FIGS. 1 and 2, the retainer 14 is disposed in a circumferential direction between a pair of annular portions 15a and 15b that are spaced apart from each other in the axial direction and between the pair of annular portions 15a and 15b. And the column part 16 which connects a pair of annular parts 15a and 15b. Between the column portions 16 adjacent to each other in the circumferential direction of the cage 14, pocket portions 17 that hold the rolling elements 13 at equal intervals in the circumferential direction are formed.

  The cage 14 is formed by fitting the cage divided pieces 14a and 14b divided into two in the axial direction to each other at the division position. The cage split pieces 14a and 14b are formed by injection molding of a synthetic resin or the like. As resin materials of the cage split pieces 14a and 14b, polyamide resins such as 46 nylon and 66 nylon, polybutylene terephthalate, and polyferene are used. Examples include sulfide (PPS), polyamideimide (PAI), thermoplastic polyimide, polyetheretherketone (PEEK), and polyethernitrile (PEN). Moreover, the rigidity and dimensional accuracy of the cage 14 can be improved by appropriately adding 10 to 50% by weight of a fibrous filler (for example, glass fiber or carbon fiber) to the above-described resin.

  In addition, although the division position of the axial direction of the retainer 14 is not particularly limited, in the present embodiment, the column portion 16 that is closer to the annular portion 15b side (right side in the drawing) from the axial center position of the retainer 14 is used. The position is a division position.

  Also, the concave / convex fitting structure of the cage split pieces 14a and 14b is not particularly limited. For example, a convex portion is provided at a split position of the cage split piece 14a, and the convex portion is used as the cage split piece. 14b may be fitted into the concave portion provided at the dividing position of 14b, and a convex portion is provided at the dividing position of the cage dividing piece 14b, and the convex portion is formed into the concave portion provided at the dividing position of the cage dividing piece 14a. You may fit. Further, a convex portion and a concave portion are provided at the dividing position of the cage dividing piece 14a, and the convex portion and the concave portion of the cage dividing piece 14a are respectively fitted to the concave portion and the convex portion provided at the dividing position of the cage dividing piece 14b. May be.

In the present embodiment, one of the pair of annular portions 15 a and 15 b of the retainer 14 has a flange that can contact the inner peripheral surface of the outer ring 11 on the annular portion 15 b (on the retainer divided piece 14 b side). The outer ring guide system is provided with the portion 18, and no flange portion is provided on the other annular portion 15 a (on the cage split piece 14 a side).
It is preferable that the inner edge of the flange portion 18 is formed to have a predetermined gentle curved surface shape.

  Therefore, according to the rolling bearing 10 of the present embodiment, the flange portion 18 that can contact the inner peripheral surface of the outer ring 11 is provided only at one end portion in the axial direction of the cage 14 (FIG. 3A). Compared to the case where the flange portion 18 that can contact the inner peripheral surface of the outer ring 11 is provided at both ends in the axial direction of the cage 14 (see FIG. 3B), the distance between the outer ring 11 and the inner ring 12 Thus, the occupied volume of the cage 14 with respect to the bearing space can be reduced, and the lubricating oil can easily enter the bearing space.

  As a result, the friction and torque can be reduced, and the flange 18 provided only at one end in the axial direction of the retainer 14 contacts the inner peripheral surface of the outer ring 11. The amount of heat generated by can be suppressed.

  Further, since the flange portion 18 is provided only at one end portion in the axial direction of the cage 14, the flange portions 18 are provided at both end portions in the axial direction of the cage 14 as shown in FIG. Compared to the case, since the cage 14 can be made lighter, the centrifugal force of the cage 14 in the high-speed rotation region can be reduced.

  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.

  For example, in the above embodiment, the flange portion that can contact the inner peripheral surface of the outer ring 11 only on one of the annular portions 15b (on the cage divided piece 14b side) of the pair of annular portions 15a and 15b of the retainer 14. However, instead of this, as in the first modification shown in FIG. 4, the other annular portion 15a (holding portion) of the pair of annular portions 15a, 15b of the retainer 14 is used. A flange portion 18 that can contact the inner peripheral surface of the outer ring 11 may be provided only on the device division piece 14a side), so that an outer ring guide system may be used.

  Moreover, in the said embodiment, the flange part which can contact the inner peripheral surface of the outer ring | wheel 11 to one ring part 15b (cage | cage division | segmentation piece 14b side) of a pair of ring parts 15a and 15b of the holder | retainer 14 is carried out. 18, and the other annular portion 15a (on the cage split piece 14a side) is not provided with a flange portion. However, as in the second modification shown in FIG. A flange portion 19 may also be provided on the cage divided piece 14 a side) so that the height B of the flange portion 19 is lower than the height A of the flange portion 18.

It is principal part sectional drawing for demonstrating one Embodiment of the rolling bearing which concerns on this invention. It is a perspective view for demonstrating the resin-made cages integrated in the rolling bearing shown in FIG. It is principal part sectional drawing for demonstrating the effect of one Embodiment of the rolling bearing which concerns on this invention, (a) is an example of this invention, (b) is a comparative example. It is principal part sectional drawing for demonstrating the 1st modification of one Embodiment of the rolling bearing which concerns on this invention. It is principal part sectional drawing for demonstrating the 2nd modification of one Embodiment of the rolling bearing which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling bearing 11 Outer ring 11a Outer ring raceway surface 12 Inner ring 12a Inner ring raceway surface 13 Rolling element 14 Cage 15a, 15b Ring part 16 Column part 17 Pocket part 18 Flange part

Claims (1)

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 plurality of rolling elements arranged to be rollable between the outer ring raceway surface and the inner ring raceway surface; A retainer made of resin that holds the plurality of rolling elements in the circumferential direction at substantially equal intervals, and the retainer includes a pair of annular portions that are spaced apart from each other in the axial direction, and the pair of circles A plurality of circumferentially arranged between the ring parts, and a column part connecting the pair of ring parts, and holding the rolling elements between the column parts adjacent to each other in the circumferential direction A rolling bearing formed of
The cage is divided into two in the axial direction, and is concavo-convexly fitted to each other at the divided position, and a flange portion capable of contacting the outer ring is provided only at one end in the axial direction of the cage. Rolling bearing.

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