JP2014211212A - Tapered roller bearing cage, and tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapered roller bearing cage capable of surely preventing the come-off of the cage from an inner ring by increasing the height of an engaging protruded portion of each column part to increase an engagement length between the engaging protruded portion and a small collar portion, and to provide a tapered roller bearing.SOLUTION: A tapered roller bearing cage 14 includes a large-diameter side annular part 15, a small-diameter side annular part 16 arranged coaxially with the large-diameter side annular part 15, a plurality of column parts 17 arranged at almost equal intervals in the peripheral direction to connect the large-diameter side annular part 15 and the small-diameter side annular part 16, and pocket parts 18 formed between the column parts 17 adjacent to each other in the peripheral direction to hold tapered rollers 13 in a rollable manner. On the inner peripheral faces of the plurality of column parts 17, engaging protruded portions 17b are formed protruded radially inside to ride over a small collar part 12b of an inner ring 12 when inserting the cage 14 into the inner ring 12. The number of the engaging protruded portions 17b is set to be smaller than the number of the tapered rollers 13.

Description

  TECHNICAL FIELD The present invention relates to a tapered roller bearing retainer and a tapered roller bearing, and more particularly to a tapered roller bearing retainer and a tapered roller bearing that are usually used in automobile transmissions, differential gears, general industrial machines, general machine tools, automobiles, and the like. About.

  As a conventional tapered roller bearing, a tapered roller bearing 100 shown in FIGS. 9 and 10 is known. The tapered roller bearing 100 includes an outer ring 111 having an outer ring raceway surface 111a on an inner peripheral surface, and an inner ring on an outer peripheral surface. An inner ring 112 having a raceway surface 112a, a plurality of tapered rollers 113 disposed so as to roll between the outer ring raceway surface 111a and the inner ring raceway surface 112a, and a resin that holds the tapered rollers 113 at equal intervals in the circumferential direction. And a cage 114 made of metal. In addition, a small collar part 112b and a large collar part 112c are formed at the axial end of the inner ring 112, respectively.

  As shown in FIGS. 9 and 10, the cage 114 includes a large-diameter-side annular portion 115, a small-diameter-side annular portion 116 coaxially arranged with the large-diameter-side annular portion 115, and a large-diameter-side annular portion. 115 and the small-diameter-side annular portion 116 are connected between a plurality of column portions 117 arranged at substantially equal intervals in the circumferential direction and the respective column portions 117 adjacent to each other in the circumferential direction. And a pocket portion 118 that is held to roll. Further, on the inner peripheral surface of all the column portions 117, an engagement convex portion 117a that engages with the small collar portion 112b of the inner ring 112 in the axial direction is formed so as to protrude radially inward. The engagement convex portion 117 a is formed so that the tapered roller 113 held in the cage 114 and the pocket portion 118 comes out of the inner ring 112 in the intermediate assembly state in which the inner ring 112, the tapered roller 113, and the cage 114 are assembled. Is preventing. In addition, as a conventional tapered roller bearing in which the engagement convex part which engages with a small collar part is provided in all the pillar parts of a cage | basket, the following patent documents 1 and 2 etc. can be mentioned, for example.

  Then, the intermediate assembly uses the elastic deformation of the resin cage 114 to push the combination of the tapered roller 113 and the cage 114 into the inner ring 112 from the small collar portion 112b side, and the inner diameter of the cage 114 Is assembled by allowing the tapered roller 113 and the engaging convex portion 117a of the column portion 117 to get over the small flange portion 112b.

Japanese Patent Application Laid-Open No. 64-40718 JP 2013-24377 A

  However, the elongation limit rate in the circumferential direction of the elastic deformation of the cage 114 is usually as small as about 2 to 3%, which limits the height of the engaging convex portion 117a that can get over the small flange portion 112b. Therefore, in the tapered roller bearing 100, since the engaging convex portions 117a are formed on all the column portions 117, the height of the engaging convex portions 117a has to be shortened, and the engaging convex portions 117a are small. The radial engagement length with the flange portion 112b is reduced, and the cage 114 may come out of the inner ring 112 even during normal handling, and the intermediate assembly may be disassembled.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to increase the height (the amount of protrusion in the radial direction) of the engaging convex portion of the column portion so that the engaging convex portion and the gavel It is an object of the present invention to provide a tapered roller bearing retainer and a tapered roller bearing that can increase the engagement length with a portion and can reliably prevent the retainer from coming out of an inner ring.

The above object of the present invention can be achieved by the following constitution.
(1) In order to connect the large diameter side annular part, the small diameter side annular part coaxially arranged with the large diameter side annular part, and the large diameter side annular part and the small diameter side annular part in the circumferential direction Tapered roller bearing retainer having a plurality of column portions arranged at substantially equal intervals and a pocket portion formed between the column portions adjacent to each other in the circumferential direction to hold the tapered rollers of the tapered roller bearings in a rollable manner. In addition, on the inner peripheral surface of the plurality of column portions, when the cage is inserted into the inner ring of the tapered roller bearing, an engaging convex portion that protrudes over the small collar portion of the inner ring protrudes radially inward and engages. A tapered roller bearing retainer characterized in that the number of convex portions is set to be smaller than the number of tapered rollers.
(2) The tapered roller bearing retainer according to (1), wherein the number of engaging convex portions is set to three or more.
(3) 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 plurality of tapered rollers arranged to be rollable between the outer ring raceway surface and the inner ring raceway surface; A tapered roller bearing comprising: a retainer for retaining the tapered rollers at equal intervals in the circumferential direction, wherein the retainer is the retainer for the tapered roller bearing according to (1) or (2). Tapered roller bearing.

  According to the tapered roller bearing retainer or the tapered roller bearing of the present invention, the engagement convexity that overcomes the small collar portion of the inner ring when the retainer is inserted into the inner ring of the tapered roller bearing is formed on the inner peripheral surface of the plurality of column portions. The portion is formed so as to protrude radially inward, and the number of engaging convex portions is set to be smaller than the number of tapered rollers. The height of the engaging convex portion of the portion can be increased. Thereby, since the engagement length of an engagement convex part and a small collar part can be increased, it can prevent reliably that a holder | retainer pulls out from an inner ring | wheel.

It is sectional drawing explaining one Embodiment of the retainer for tapered roller bearings and tapered roller bearing which concern on this invention, and is AA sectional view taken on the line of FIG. It is the top view which looked at the intermediate assembly which assembled the inner ring | wheel, the tapered roller, and the holder | retainer which were shown in FIG. 1 from the small collar part side. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a top view corresponding to Drawing 2 explaining the state where a tapered roller and a cage are inserted in an inner ring. It is CC sectional view taken on the line of FIG. It is a table | surface which shows the elongation rate of the holder | retainer at the time of incorporation with respect to the height of an engagement convex part, and the number of engagement convex parts. It is a top view corresponding to Drawing 4 explaining the 1st modification of a tapered roller bearing retainer concerning the present invention. It is a top view corresponding to Drawing 4 explaining the 2nd modification of a tapered roller bearing retainer concerning the present invention. It is principal part sectional drawing explaining the conventional tapered roller bearing. It is the top view which looked at the intermediate assembly which assembled the inner ring | wheel, the tapered roller, and the holder | retainer which were shown in FIG. 9 from the small collar part side.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of a tapered roller bearing retainer and a tapered roller bearing according to the invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the tapered roller 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. A plurality (20 in this embodiment) of tapered rollers 13 disposed so as to be able to roll between the raceway surface 12a and a tapered roller bearing retainer 14 that holds the tapered rollers 13 at equal intervals in the circumferential direction ( Hereinafter, it is also simply referred to as “retainer”). In addition, a small flange portion 12b and a large flange portion 12c are formed at the axial end portion of the inner ring 12, respectively.

  The tapered roller bearing retainer 14 is formed by injection molding of synthetic resin, and is coaxially disposed with the large diameter side annular portion 15 and the large diameter side annular portion 15 as shown in FIGS. 1 and 2. A plurality of (20 in this embodiment) column portions arranged at substantially equal intervals in the circumferential direction so as to connect the small-diameter-side annular portion 16, the large-diameter-side annular portion 15, and the small-diameter-side annular portion 16. 17 and a pocket portion 18 that is formed between the column portions 17 adjacent to each other in the circumferential direction and holds the tapered roller 13 in a rollable manner.

  Further, as shown in FIGS. 1 and 2, a convex portion 17 a that does not contact the small collar portion 12 b when the cage 14 is inserted into the inner ring 12 protrudes radially inward on the inner peripheral surface of each column portion 17. Is formed. For this reason, the internal diameter of the convex part 17a is set more than the outer diameter of the small collar part 12b.

  Further, as shown in FIGS. 2 and 3, the small-diameter side end of the convex portion 17 a of the four pillars 17 of equal arrangement gets over the small flange portion 12 b when the cage 14 is inserted into the inner ring 12. An engaging convex portion 17b that engages with the small collar portion 12b is formed to protrude radially inward. Therefore, the number of the engaging convex portions 17b is set to be three or more than the number of the tapered rollers 13.

  When the rolling bearing 10 configured as described above is assembled into an intermediate assembly, a combination of the tapered roller 13 and the retainer 14 is inserted into the inner ring 12 from the side of the small flange portion 12b, so that FIGS. As shown in FIG. 4, the four engaging convex portions 17b come into contact with the outer peripheral surface of the small flange portion 12b, and the retainer 14 is spread out in a rounded quadrangular shape, and the tapered roller 13 and the column portion 17 are As shown in FIG. 3, the engaging convex portion 17 b gets over the small collar portion 12 b and the engaging convex portion 17 b is engaged with the small collar portion 12 b. When inserting the cage 14, it is preferable to preliminarily deform the cage 14 by applying a pressure so as to assist the deformation, thereby reducing the pressure applied to the cage 14. Assembling property can be improved.

  According to Japanese Unexamined Patent Publication No. 2007-057038, the diameter of the resin cage is set to 0.975 times or more of the bearing inner ring diameter in consideration of cracking and plastic deformation. That is, the elongation in the circumferential direction due to the elastic deformation of the cage is set to be within + 2.5%. For example, in the conventional tapered roller bearing shown in FIGS. 9 and 10, the circumscribed circle diameter of the small collar portion of the inner ring and the cage inscribed circle diameter are set to 40 mm, and the height of the engaging convex portion is set to 0.5 mm. If the cage is expanded concentrically at the time of insertion, the inscribed circle diameter of the cage is expanded by 1 mm to 41 mm, and the elongation percentage of the cage is + 2.5%.

  Here, assuming that the number of engaging protrusions that come into contact with the small collar portion is three and the height of the engaging protrusion is set to 1.0 mm, the cage at the time of insertion becomes a rounded triangular shape. The elongation rate of the cage is + 1.86%, and the cage is not damaged. In the case where the number of the engaging convex portions is three and the height of the engaging convex portion is set to 1.25 mm, the elongation percentage of the cage is + 2.36%, and the height of the engaging convex portion is When set to 1.5 mm, the elongation percentage of the cage is + 2.87%.

  Further, in the case where the number of engaging convex portions contacting the small collar portion is four, when the height of the engaging convex portion is set to 1.0 mm, the elongation percentage of the cage is + 1.94%, When the height of the engaging convex portion is set to 1.25 mm, the elongation rate of the cage is + 2.50%, and when the height of the engaging convex portion is set to 1.5 mm, the elongation rate of the cage is + 3.08%.

  Then, when the elongation ratio of the cage at the time of incorporation with respect to the height of the engagement convex portion and the number of the engagement convex portions is summarized in a table, it is as shown in FIG. 6, and the threshold value of the elongation rate of the cage is + 2.5%. In this case, in order to obtain an engagement convex portion having a height of 1.25 mm, it is understood that the number of engagement convex portions must be four or less.

  As described above, according to the rolling bearing 10 of the present embodiment, when the cage 14 is inserted into the inner ring 12 on the inner peripheral surface of the four column portions 17, the small collar portion 12 b is overcome. Since the engaging projections 17b that engage with the projections are formed so as to protrude radially inward, the height of the engagement projections 17b of the column portions 17 is higher than when the engagement projections are formed on all the column portions. The length can be increased. Thereby, since the engagement length of the engagement convex part 17b and the small collar part 12b can be increased, it can prevent reliably that the holder | retainer 14 slips out from the inner ring | wheel 12.

  When the number of engaging projections is sufficiently large, the arc of the cage during assembly is close to a concentric shape with respect to the inner ring, and the extendable length of the engaging projection is reduced. When the number of joint convex portions is small, deformation of the engaging convex portion of the cage becomes a steep convex shape, which may cause damage due to stress concentration. For this reason, there is a trade-off relationship between the height of the engaging protrusions and the number of engaging protrusions, which are related to the cage diameter, the allowable deformation of the material, and the required engagement protrusions and small hooks. Each should be considered according to the total length.

  Then, as a first modification of the present embodiment, in consideration of maintaining sufficient strength of the cage, the number of the engaging projections 17b is half of the column portion 17 as shown in FIG. Also good. According to this modification, the cage 14 at the time of insertion becomes substantially circular, and stress concentration due to the convex shape described above can be avoided. Further, at this time, the cage 14 may be sufficiently larger than the inner ring 12 between the two engaging projections 17 b adjacent to each other by the number of the tapered rollers 13 or the inner ring 12. In this case, a second engagement projection 17c having a height that does not contact the small flange portion 12b at the time of insertion may be formed on the column portion 17 where the engagement projection 17b is not formed. The joint convex part 17c functions as an auxiliary engaging part.

  Further, as a second modification of the present embodiment, as shown in FIG. 8, when the number of tapered rollers 13 is an even number (20) and the number of engaging projections 17b is an odd number (three), the engagement is performed. The convex portions 17b may not be arranged uniformly. In this case, the same effect as in the case of the uniform arrangement can be obtained. Note that even when the number of tapered rollers 13 is an odd number and the number of engaging convex portions 17b is an even number, the engaging convex portions 17b cannot be evenly arranged, but the same effect as in the case of the uniform arrangement can be obtained.

  Furthermore, when the number of the engaging convex portions is two and the two engaging convex portions are evenly arranged at the symmetrical position of the cage, the cage at the time of insertion becomes an elliptical shape, and the engaging convex portion and the gavel portion The engagement length can be made very large, but the pulling force in the direction with the two engaging projections as axes is very weak. Furthermore, when the two engaging convex portions are arranged unevenly, a portion that does not engage with the small flange portion of 180 degrees or more is generated on one side. Therefore, a cage with two engaging protrusions is not effective.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

DESCRIPTION OF SYMBOLS 10 Tapered roller bearing 11 Outer ring 11a Outer ring raceway surface 12 Inner ring 12a Inner ring raceway surface 12b Small collar part 12c Large collar part 13 Tapered roller 14 Tapered roller bearing cage 15 Large diameter side annular part 16 Small diameter side annular part 17 Column part 17a convex part 17b engaging convex part 18 pocket part

Claims (3)

In order to connect the large diameter side annular part, the small diameter side annular part coaxially arranged with the large diameter side annular part, and the large diameter side annular part and the small diameter side annular part in the circumferential direction. Tapered roller bearing holder having a plurality of column portions arranged at substantially equal intervals and a pocket portion formed between the column portions adjacent to each other in the circumferential direction to hold the tapered rollers of the tapered roller bearings in a rollable manner. A vessel,
On the inner peripheral surface of the plurality of column portions, an engaging convex portion that climbs over the small collar portion of the inner ring when the cage is inserted into the inner ring of the tapered roller bearing is formed to protrude radially inward,
A tapered roller bearing retainer characterized in that the number of engaging projections is set to be smaller than the number of tapered rollers.   2. The tapered roller bearing retainer according to claim 1, wherein the number of the engaging convex portions is set to three or more. 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 tapered rollers arranged to be rollable between the outer ring raceway surface and the inner ring raceway surface; A tapered roller bearing comprising: a retainer that holds the tapered rollers at equal intervals in the circumferential direction;
A tapered roller bearing, wherein the cage is a tapered roller bearing cage according to claim 1 or 2.

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