JP2009002377A - Tapered roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tapered roller bearing, in which stirring resistance of lubricant is reduced and integrity of a roller, a cage, and an inner ring is maintained. <P>SOLUTION: In the tapered roller bearing 10, a plurality of tapered rollers 18 disposed between the inner ring 14 and an outer ring 12 are retained in a comb-shaped cage 16 having a circular ring part 20 on a small diameter side of a conical shape. In the cage 16, a bent part 24 is formed by directing a small diameter side end part to the radially inside of the bearing. An annular projection part 28 is formed to an outer peripheral face of a small diameter side collar part of the inner ring, for restricting a position of an axially outside of the bent part 24 of the cage 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing in which a plurality of tapered rollers that are rotatably held in a cage are incorporated between raceway surfaces formed respectively on an outer ring and an inner ring, and more specifically, for maintaining unity. Concerning structure.

  Conventionally, double row cylindrical roller bearings are known (for example, see Patent Document 1). In the double-row cylindrical roller bearing described in Patent Document 1, a comb-shaped cage is used. The comb-shaped cage has an advantage that the lubricant discharging performance is good. In particular, the comb-shaped cage has the effect of reducing the stirring resistance of the lubricant and suppressing the heat generation of the bearing. Further, as described in Patent Document 2, a comb-shaped cage having a shape in which both ends in the axial direction are open has been proposed.

  Further, tapered roller bearings for automobiles are often used in an environment rich in lubricants, and therefore, there is a problem that stirring resistance tends to increase, and various countermeasures have been taken (for example, Patent Document 3). reference). In the tapered roller bearing described in Patent Document 3, the cage is not comb-shaped, but has a configuration in which a small-diameter side end and a large-diameter side end each have an annular portion. In this tapered roller bearing, the labyrinth is constituted by the small-diameter side end of the cage and the inner ring, and the amount of lubricant flowing into the bearing is reduced, thereby reducing the stirring resistance of the lubricant. .

JP-A-9-177794 (FIGS. 1 and 3) JP 2002-310170 A JP 2005-69421 A

  As a measure for suppressing the stirring resistance of the tapered roller bearing described above, the use of a comb cage can be considered. However, when a comb cage is used for a cylindrical roller bearing, there is an advantage that the integrity of the rollers, the cage and the inner ring is maintained, and these have the advantage that they are not separated. However, a comb cage is used for the tapered roller bearing. In this case, the above advantages are impaired, and there is a problem that the rollers, the cage, and the inner ring are likely to be loosened. This is considered to be due to the fact that the mass of the tapered roller is concentrated on the small diameter side end portion of the comb-shaped cage, and the cage is easily moved in the axial direction.

  An object of the present invention is to provide a tapered roller bearing that can reduce the stirring resistance of a lubricant and can maintain the integrity of a roller, a cage, and an inner ring.

  The above object of the present invention is achieved by the following configurations.

(1) In a tapered roller bearing in which a plurality of tapered rollers disposed between an inner ring and an outer ring are held by a comb-shaped cage having a ring portion on the small diameter side of the tapered shape,
The cage is formed with a bent portion whose end on the small diameter side is directed inward in the radial direction of the bearing, and the inner ring is positioned on the outer peripheral surface of the flange portion on the small diameter side on the outer side in the axial direction of the bent portion of the cage. A tapered roller bearing in which an annular projecting portion to be regulated is formed.

  (2) The tapered roller bearing according to (1), wherein the bent portions are provided with locking portions that are locked to the annular protrusions in a circumferential direction.

  (3) The tip surface of the locking portion and the peripheral surface of the annular protrusion are inclined surfaces, and the inclined surface of the annular protrusion is an inclined surface whose diameter is increased inward in the axial direction. The tapered roller bearing described in (2) above.

  (4) The tapered roller bearing according to any one of (1) to (3), wherein the cage is manufactured by press-molding a steel plate.

  (5) The tapered roller bearing according to any one of (1) to (3), wherein the cage is made of resin.

  In the tapered roller bearing according to the above (1), the bent portion at the small-diameter end of the comb-shaped cage enters the inner side in the axial direction from the annular protrusion formed on the outer peripheral surface of the small-diameter side collar portion of the inner ring. The position in the axial direction is regulated by the protrusion. Therefore, since the comb-shaped cage is not greatly displaced in the axial direction, the integrity of the tapered roller, the cage, and the inner ring is maintained, and these are not separated.

  In the tapered roller bearing according to the above (2), since the locking portions are dispersed in the circumferential direction, it is easy to insert the locking portions on the inner side in the axial direction than the annular protrusion.

  In the tapered roller bearing according to the above (3), since the inclined surface of the engaging portion is guided by the inclined surface of the circumferential surface of the annular protrusion, the engaging portion is inserted axially inside the annular protrusion. Easy.

  In the tapered roller bearing according to (4), the cage can be easily manufactured by additionally processing an existing steel cage.

  In the tapered roller bearing described in (5), the cage can be easily manufactured by injection molding.

  According to the tapered roller bearing of the present invention, the stirring resistance of the lubricant can be reduced by using the comb cage, and the comb cage is not greatly displaced in the axial direction, so the integrity of the tapered roller, the cage and the inner ring Are retained, and these will not be separated.

  The tapered roller bearing obtained by the present invention is used in automobiles, industrial machines, and the like, and is particularly suitable for use in a gear device for automobile transmissions when high durability and high load resistance are required.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional view of a main part of a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of a second embodiment of the present invention, and FIG. 3 is a cross-sectional view of a main part of the third embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line AA in FIG. 3, and FIG.

  As shown in FIG. 1, the tapered roller bearing 10 of the first embodiment includes a plurality of tapered rollers that are rotatably held by a cage 16 between raceway surfaces 12 a and 14 a formed on an outer ring 12 and an inner ring 14, respectively. The roller 18 is incorporated. The cage 16 is conical and has a comb shape having an annular portion 20 on the small diameter side, and a roller pocket 22 is opened at an end portion on the large diameter side. The cage 16 is formed with a bent portion 24 facing inward in the radial direction of the bearing 10 at an end portion on the small diameter side. The bent portion 24 is formed in the entire area in the circumferential direction.

  The cage 16 is formed by pressing steel. The retainer 16 formed into a conical shape and a conical shape by pressing is assembled to the inner ring by caulking from the state shown by the dotted line in FIG.

  The inner ring 14 is formed with a first annular protrusion 28 facing outward in the radial direction of the bearing at the end on the small diameter side. Further, a second annular protrusion 30 facing outward in the radial direction is formed on the inner side in the axial direction of the first annular protrusion 28.

  A groove 32 slightly larger than the bent portion 24 is formed between the first annular protrusion 28 and the second annular protrusion 30, and the bent portion 24 of the cage 16 is formed in the groove 32. Has been inserted. Therefore, the bent portion 24 is restricted from moving in the axial direction by the first annular protrusion 28 and the second annular protrusion 30, and the cage 16 is not greatly displaced in the axial direction. The tapered roller 18 is restricted in its axial position by the second annular protrusion 30 and the large-diameter flange 34 of the inner ring 14.

  In the first embodiment, the bent portion 24 enters the groove 32 between the first annular protrusion 28 and the second annular protrusion 30, and the first annular protrusion 28 and the second annular protrusion The portion 30 regulates the axial position of the cage 16. That is, the first annular protrusion 28 restricts movement outward in the axial direction, and the second annular protrusion 30 restricts movement in the axially inward direction.

  According to the tapered roller bearing 10 configured as described above, since the comb-shaped cage 16 is used, the stirring resistance of the lubricant can be reduced, and the cage 16 is not greatly displaced in the axial direction. Therefore, the integrity of the inner ring 14, the cage 16, and the tapered roller 18 is maintained, and the performance of the bearing 10 does not deteriorate.

  Since the first annular protrusion 28 and the second annular protrusion 30 have a function of guiding the cage 16 so as to rotate smoothly, the first annular protrusion 28 and the second annular protrusion 30 are connected to the inner ring 14 as in the first embodiment. Although two annular protrusions 30 are preferably provided, a configuration as in the second embodiment shown in FIG. 2 may be used.

  FIG. 2 is a cross-sectional view of an essential part of the second embodiment of the present invention. The tapered roller bearing of the second embodiment has a configuration in which the second annular protrusion 30 is omitted from the tapered roller bearing of the first embodiment. Since the cage 16 is also prevented from moving inward in the axial direction by the tapered roller 18, from the viewpoint of preventing flaking, the second annular protrusion 30 is omitted as shown in FIG. Also good.

  FIG. 3 is a cross-sectional view of an essential part of a third embodiment of the present invention. The tapered roller bearing of the third embodiment is a modification of the first embodiment. A locking portion 26 is formed on the inner surface in the radial direction of the bent portion 24, and the locking portion 26 is a first annular protrusion. It is inserted in the groove 32 between the second annular protrusion 30 and the second annular protrusion 30. Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in the AA sectional view of FIG. 3 in FIG. 4, the locking portions 26 formed in the bent portion 24 are not formed in the entire circumferential direction, but are dispersed in the circumferential direction. Yes. In the third embodiment, six locking portions 26 are formed at equal intervals with a central angle of 60 °.

  The cage 16 may be formed by pressing steel, but is preferably injection molded with resin. In order to mount the retainer 16 on the inner ring 14, the retainer 16 is moved along the axial direction, the larger diameter side of the retainer 16 is fitted from the smaller diameter side of the inner ring 14, and the bent portion on the smaller diameter side of the retainer 16 is fitted. The locking portions 26 of 24 are elastically deformed to expand the diameter, and the locking portions 26 are inserted into the grooves 32.

  Here, since the retainer 16 is formed by dispersing the locking portions 26 in the circumferential direction, the locking portions 26 can be easily deformed and can get over the first annular protrusion 28. Is easy to install. And if the holder | retainer 16 is shape | molded by resin, the latching | locking part 26 can deform | transform easily and mounting | wearing of the holder | retainer 16 is easy.

  Further, since the locking portions 26 are formed in the circumferential direction, the contact portion between the cage 16 and the inner ring 14 is reduced, and the rotational torque of the cage 16 is reduced. Further, since the inner ring 14 has few opportunities to come into contact with the locking portion, wear of the inner ring 14 is reduced.

  FIG. 5 is a cross-sectional view of an essential part of the fourth embodiment of the present invention. As shown in FIG. 5, it is preferable that the peripheral surface of the first annular protrusion 28 and the front end surface of the locking portion 26 are opposed inclined surfaces. The peripheral surface of the first annular protrusion 28 of the inner ring 14 has a larger diameter as it goes inward in the axial direction. Further, the distal end surface of the bent portion 24 of the cage 16 also has a larger diameter as it goes inward in the axial direction.

  As described above, the peripheral surface of the first annular protrusion 28 of the inner ring 14 and the front end surface of the engaging portion 26 of the bent portion 24 of the retainer 16 are opposed inclined surfaces. Is moved along the axial direction, and the locking portion 26 is elastically deformed while the inclined surface of the distal end portion of the locking portion 26 is guided by the inclined surface of the distal end portion of the first annular protrusion 28. Therefore, the insertion of the locking part 26 becomes easy. The cage 16 is preferably made of resin so that the locking portion 26 is easily deformed, but may be made of steel.

  In the third embodiment and the fourth embodiment, the second annular protrusion 30 may be omitted.

  Note that the cage 16 of each of the above embodiments is made of steel or resin. Here, PA, PPS, PEEK, PTFE, or the like can be used as the resin material.

It is principal part sectional drawing which shows the tapered roller bearing which is 1st Embodiment of this invention. It is principal part sectional drawing which shows the tapered roller bearing which is 2nd Embodiment of this invention. It is principal part sectional drawing of the tapered roller bearing which is 3rd Embodiment of this invention. It is AA sectional drawing of FIG. It is principal part sectional drawing of the tapered roller bearing which is 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tapered roller bearing 12 Outer ring 14 Inner ring 16 Cage 18 Tapered roller 20 Ring part 22 Pocket 24 Bending part 26 Locking part 28 First annular protrusion 30 Second annular protrusion 32 Groove 34 Large diameter side collar part

Claims (5)

In a tapered roller bearing in which a plurality of tapered rollers arranged between an inner ring and an outer ring are held by a comb-shaped cage having a ring portion on the small diameter side of the tapered shape,
The cage is formed with a bent portion whose end on the small diameter side faces the inside in the radial direction of the bearing, and the inner ring is positioned on the outer peripheral surface of the flange portion on the small diameter side on the outer side in the axial direction of the bent portion of the cage. A tapered roller bearing characterized in that an annular protrusion is formed for regulating the pressure.   The tapered roller bearing according to claim 1, wherein the bent portions are provided with locking portions that are locked to the annular protrusions in a circumferential direction.   The front end surface of the locking portion and the peripheral surface of the annular protrusion are inclined surfaces, and the inclined surface of the annular protrusion is an inclined surface whose diameter is increased inward in the axial direction. The tapered roller bearing according to claim 2.   The tapered roller bearing according to any one of claims 1 to 3, wherein the cage is manufactured by press-molding a steel plate.   The tapered roller bearing according to any one of claims 1 to 3, wherein the cage is made of resin.

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