JP2016173125A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of suppressing the wear of a guideway.SOLUTION: A rolling bearing 10 includes an inner ring 4, an outer ring 5, a plurality of balls 3, and a cage 7. The outer ring 4 is arranged on the outer periphery side of the inner ring 5. The outer ring 4 is arranged on the outer periphery side of the inner ring 5. The plurality of balls 3 are arranged between the inner ring 5 and the outer ring 4. The cage 7 is constructed to hold the plurality of balls 3, and has a plurality of pockets 9 formed along the peripheral direction, including guideways 1a1, 1b1 opposed to the balls 3, respectively. At least one of the plurality of pockets 9 has a protruded part 2 on each of the guideways 1a1, 1b1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing having a cage.

  For example, Japanese Unexamined Patent Application Publication No. 2008-175310 (Patent Document 1) discloses a thrust roller bearing. The cage of the thrust roller bearing is composed of a single annular plate. In the cage, pockets for accommodating the needle rollers are formed on the circumference.

JP 2008-175310 A

  In a cage for a rolling bearing, the rolling element may move along the circumferential direction or may be delayed with respect to the cage. In such a case, the rolling element collides with the guide surface forming the pocket of the cage, and if the lubrication state is poor, the guide surface is worn. When wear powder generated by wear of the guide surface is mixed with grease, the lubrication state is further deteriorated and the lubrication life of the grease is reduced.

  This invention is made | formed in view of the said subject, The objective is to provide the rolling bearing which can suppress abrasion of a guide surface.

  A rolling bearing according to an embodiment of the present invention includes an inner ring, an outer ring, a plurality of balls, and a cage. The outer ring is disposed on the outer peripheral side of the inner ring. The plurality of balls are arranged between the inner ring and the outer ring. The cage is configured to be able to hold each of the plurality of balls, and a plurality of pockets including a guide surface facing the balls are formed along the circumferential direction. At least one of the plurality of pockets has a convex portion on the guide surface.

  According to the rolling bearing according to the embodiment of the present invention, at least one of the plurality of pockets is provided with a convex portion on the guide surface. Thereby, since the ball | bowl as a rolling element and a holder | retainer become point contact instead of surface contact, sliding wear resistance can be reduced compared with the case where the convex part is not provided in the guide surface. As a result, wear on the guide surface can be suppressed.

  In the rolling bearing according to the embodiment, preferably, the convex portion is provided in all of the plurality of pockets. Thereby, abrasion of a guide surface can be suppressed in all the pockets.

  Preferably, in the rolling bearing according to the above-described embodiment, the convex portion is, as viewed from the center of the ball, a first convex portion provided on one side in the circumferential direction and a second convex portion provided on the other side in the circumferential direction. And a convex portion. This allows the ball to make point contact with the cage both when the ball has advanced circumferentially with respect to the cage and when it has been delayed. Therefore, wear of the guide surface can be further suppressed.

  In the rolling bearing according to the embodiment, preferably, an angle formed by a straight line passing through the convex portion and the center of the ball and a circumferential tangent line passing through the center of the ball is 10 ° or less. Thereby, when the ball has advanced in the circumferential direction or delayed with respect to the cage, the ball is likely to make point contact with the cage. Therefore, wear of the guide surface can be further suppressed.

  In the rolling bearing according to the one embodiment, the shape of the convex portion may be a long and thin shape extending in the radial direction of the cage as viewed from the center of the ball. Thereby, even if it is a case where a ball moves with respect to the radial direction of a cage, it becomes possible for a ball to carry out point contact with a cage. Therefore, wear of the guide surface can be further suppressed.

  In the rolling bearing according to the one embodiment, the convex portion may include a third convex portion and a fourth convex portion that are arranged so as to be separated from each other in the radial direction of the cage. Thereby, even if it is a case where a ball moves with respect to the radial direction of a cage, it becomes possible for a ball to carry out point contact with a cage. Therefore, wear of the guide surface can be further suppressed.

  In the rolling bearing according to the above-described embodiment, the convex portion that contacts the ball may be a curved surface. Thereby, abrasion of a guide surface can be suppressed effectively.

  In the rolling bearing according to the above-described embodiment, the portion of the convex portion that contacts the ball may be a flat surface. Thereby, abrasion of a guide surface can be suppressed effectively.

  ADVANTAGE OF THE INVENTION According to this invention, the rolling bearing which can suppress abrasion of a guide surface can be provided.

It is a cross-sectional schematic diagram which shows the structure of the rolling bearing which concerns on embodiment of this invention. It is a perspective schematic diagram which shows the structure of the holder | retainer which the rolling bearing which concerns on embodiment of this invention has. It is a cross-sectional schematic diagram which shows the structure of the 1st example of the holder | retainer which the rolling bearing which concerns on embodiment of this invention has. It is a cross-sectional schematic diagram which shows the structure of the 2nd example of the holder | retainer which the rolling bearing which concerns on embodiment of this invention has. It is a cross-sectional schematic diagram which shows the structure of the 3rd example of the holder | retainer which the rolling bearing which concerns on embodiment of this invention has. It is a perspective schematic diagram which shows the structure of the 1st example of the convex part formed in the holder | retainer which concerns on embodiment of this invention. It is a perspective schematic diagram which shows the structure of the 2nd example of the convex part formed in the holder | retainer which concerns on embodiment of this invention. It is a cross-sectional schematic diagram which shows the structure of the 3rd example of the convex part formed in the holder | retainer which concerns on embodiment of this invention. It is a cross-sectional schematic diagram which shows the structure of the 4th example of the convex part formed in the holder | retainer which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

With reference to FIG. 1, the structure of the rolling bearing 10 which concerns on embodiment of this invention is demonstrated.
The rolling bearing 10 according to the embodiment mainly includes an inner ring 5, an outer ring 4, a plurality of balls 3, and a cage 7. The outer ring 4 is disposed on the outer peripheral side of the inner ring 5. The plurality of balls 3 are arranged between the inner ring 5 and the outer ring 4. The cage 7 is disposed on the outer peripheral side of the inner ring 5 and on the inner peripheral side of the outer ring 4. Each of the outer ring 4 and the inner ring 5 has an annular shape. A shaft 6 can be fitted inside the inner ring 5. The inner ring 5 can rotate together with the shaft 6. The shaft 6 is located at the center O2 of the inner ring 5.

  With reference to FIGS. 2 and 3, the retainer 7 mainly has an annular body 1 and a rivet 12. The annular body 1 includes a first annular body 1a and a second annular body 1b. The first annular body 1a includes a first guide surface 1a1, a first contact surface 1a2, and a first outer surface 1a3. Similarly, the second annular body 1b includes a second guide surface 1b1, a second contact surface 1b2, and a second outer surface 1b3. The first annular body 1a is disposed so as to face the second annular body 1b. Specifically, the first contact surface 1a2 is in contact with the second contact surface 1b2. The first guide surface 1a1 faces the second guide surface 1b1 in a state of being separated from the second guide surface 1b1. The first annular body 1a is formed with a first through hole 11a penetrating the first outer surface 1a3 and the first contact surface 1a2. Similarly, the 2nd through-hole 11b which penetrates 2nd outer surface 1b3 and 2nd contact surface 1b2 is formed in the 2nd annular body 1b. Rivets 12 are inserted into the first through hole 11a and the second through hole 11b. The first annular body 1 a and the second annular body 1 b are fixed using rivets 12. The first annular body 1a is disposed on one side in the axial direction A, and the second annular body 1b is disposed on the other side in the axial direction A.

  The cage 7 is configured to be able to hold each of the plurality of balls 3. As shown in FIG. 3, each of the plurality of balls 3 is disposed in each of the plurality of pockets 9. That is, one ball 3 is arranged in one pocket 9. The pocket 9 includes a first guide surface 1a1 and a second guide surface 1b1. In other words, the pocket 9 is constituted by the first guide surface 1a1 and the second guide surface 1b1. The first guide surface 1 a 1 and the second guide surface 1 b 1 face the ball 3. The ball 3 is surrounded by the first guide surface 1a1 and the second guide surface 1b1. For example, lubricating grease is provided between each of the first guide surface 1 a 1 and the second guide surface 1 b 1 and the ball 3. As shown in FIG. 2, a plurality of pockets 9 including the first guide surface 1 a 1 and the second guide surface 1 b 1 are formed in the cage 7 along the circumferential direction P. For example, eight pockets 9 may be provided along the circumferential direction P of the cage 7 at intervals of 45 °. The number of pockets 9 may be a number other than eight.

  As shown in FIG. 3, the guide surfaces 1 a 1 and 1 b 1 are provided with convex portions 2. Specifically, the convex portion 2 is provided on the other side in the circumferential direction P and the first convex portion 2a provided on one side in the circumferential direction P of the cage 7 when viewed from the center O1 of the ball 3. You may have the 2nd convex part 2b. The 1st convex part 2a is provided in the 1st guide surface 1a1. The 1st convex part 2a is formed so that it may protrude toward the center O1 of the ball | bowl 3 from the 1st guide surface 1a1. Similarly, the 2nd convex part 2b is provided in the 2nd guide surface 1b1. The 2nd convex part 2b is formed so that it may protrude toward the center O1 of the ball | bowl 3 from the 2nd guide surface 1b1.

  The first guide surface 1a1 and the second guide surface 1b1 are concave curved surfaces. The first guide surface 1a1 and the second guide surface 1b1 may be parabolic surfaces. The center O1 of the ball 3 may be positioned in a straight line connecting the first convex portion 2a and the second convex portion 2b. The first convex portion 2a may be provided on one side in the axial direction A of the shaft 6 (see FIG. 1), and the second convex portion 2b may be provided on the other side in the axial direction A.

  Referring to FIG. 3, preferably, an angle θ formed by a straight line L1 passing through the first convex portion 2a and the center O1 of the ball 3 and a tangent line L2 in the circumferential direction P passing through the center O1 of the ball 3 is 10 ° or less. It is. The angle θ may be 10 ° or less in at least one pocket 9 of the plurality of pockets 9, and the angle θ may be larger than 10 ° in some pockets 9. Preferably, the angle θ is 10 ° or less in all the pockets 9 of the plurality of pockets 9.

  In the first guide surface 1a1 of a certain pocket 9, the first convex portion 2a is provided on one side in the circumferential direction P. On the first guide surface 1a1 of the pocket 9 adjacent to the pocket 9, the other in the circumferential direction P is provided. The 2nd convex part 2b may be provided in the side. Similarly, in the second guide surface 1b1 of a certain pocket 9, the second convex portion 2b is provided on the other side in the circumferential direction P, and in the second guide surface 1b1 of the pocket 9 adjacent to the pocket 9, the circumferential direction The 1st convex part 2a may be provided in the one side of P. FIG.

  As shown in FIG. 4, in the first guide surfaces 1 a 1 of all pockets 9, the first protrusion 2 a 1 provided on one side in the circumferential direction P of the cage 7 when viewed from the center O 1 of the ball 3, The 2nd convex part 2b1 provided in the other side of the circumferential direction P may be provided. Similarly, in the second guide surfaces 1b1 of all the pockets 9, when viewed from the center O1 of the ball 3, the first protrusion 2a2 provided on one side in the circumferential direction P of the cage 7 and the other in the circumferential direction P The 2nd convex part 2b2 provided in the side may be provided. The first convex portion 2a2 and the second convex portion 2b2 may be arranged at positions symmetrical with respect to the circumferential direction P.

  As shown in FIG. 5, the convex portion 2 is formed in a certain pocket 9, but the convex portion 2 may not be formed in the other pocket 9. The first guide surface 1a1 of a pocket 9 is provided with a first convex portion 2a2 provided on one side in the circumferential direction P of the cage 7 when viewed from the center O1 of the ball 3, and the second guide surface 1b1 may be provided with a second protrusion 2b2 provided on the other side in the circumferential direction P. The convex portion 2 may not be provided in the pocket 9 adjacent to the pocket 9. That is, at least one of the plurality of pockets 9 is provided with the convex portion 2 on the guide surfaces 1a1 and 1b1. In other words, the convex portion 2 may not be provided in some of the plurality of pockets 9. Preferably, the convex portion 2 is provided in all of the plurality of pockets 9.

  As shown in FIG. 2, when eight pockets 9 are provided along the circumferential direction P of the cage 7 at intervals of 45 °, for example, the pockets 9 having the convex portions 2 are arranged every 90 °. It may be. For example, when it is determined that a certain pocket 9 is loaded more than the other pockets 9, the convex portion 2 may be provided only in the pocket 9 that is loaded more. The pockets 9 in which the convex portions 2 are provided along the circumferential direction P and the pockets 9 in which the convex portions 2 are not provided may be alternately arranged.

Next, a specific example of the structure of the convex portion will be described.
FIG. 6 is a schematic perspective view showing the structure of the first example of the convex portion 2. As shown in FIG. 6, when viewed from the center O <b> 1 of the ball 3, the shape of the convex portion 2 may be a long and narrow shape extending in the radial direction R of the cage 7. In other words, when viewed from the axial direction A, the shape of the convex portion 2 may be a long and thin shape extending in the radial direction R of the cage 7. The convex part 2 may be curved along the curved surface shape of the guide surface 1b1. The convex portion 2 may be line symmetric with respect to the circumferential direction P.

  FIG. 7 is a schematic perspective view showing the structure of the second example of the convex portion 2. As shown in FIG. 7, the convex portion 2 may have a third convex portion 2 c and a fourth convex portion 2 d that are arranged so as to be separated in the radial direction R of the cage 7. The third convex portion 2c is provided on one side in the radial direction R, and the fourth convex portion 2d is provided on the other side in the radial direction R. The 3rd convex part 2c and the 4th convex part 2d may be curving along the curved surface shape of the guide surface 1b1. The third convex portion 2c and the fourth convex portion 2d may be line symmetric with respect to the circumferential direction P.

  FIG. 8 is a schematic cross-sectional view showing the structure of the third example of the convex portion 2. As shown in FIG. 8, the convex portion 2 may be formed integrally with the guide surface 1a1. For example, the convex portion 2 may be formed on the guide surface 1a1 by pressing the guide surface 1a1. A concave portion 8 may be formed in the first outer surface 1a3 opposite to the convex portion 2. As shown in FIG. 8, the portion of the convex portion 2 that contacts the ball 3 may be a curved surface. The height H of the convex part 2 is 0.05 mm or more and 0.25 mm or less, for example. The height H is calculated, for example, as the distance from the guide surface 1a1 to the apex of the convex portion 2 in the direction along the straight line connecting the convex portion 2 and the center O1 of the ball 3.

  FIG. 9 is a schematic cross-sectional view showing the structure of the fourth example of the convex portion 2. As shown in FIG. 9, the portion of the convex portion 2 that contacts the ball 3 may be a flat surface. The convex part 2 has, for example, a planar top surface 2e and a side surface 2f that connects the top surface 2e and the guide surface 1a1. The side surface 2f may be a curved surface or a flat surface. A concave portion 8 may be formed on the first outer surface 1a3 on the opposite side of the convex portion 2. The recess 8 has a planar bottom surface 8a and a side surface 8b that connects the bottom surface 8a and the first outer surface 1a3. The top surface 2e and the bottom surface 8a may be parallel. The height H of the convex part 2 is 0.05 mm or more and 0.25 mm or less, for example. The height H is calculated as a distance from the guide surface 1a1 to the top surface 2e of the convex portion 2 in a direction along a straight line connecting the convex portion 2 and the center O1 of the ball 3, for example.

  In addition, in the above, although the case where the convex part 2 was integrated with the guide surface was demonstrated, the convex part 2 may be a different body from the guide surface 1a1. Moreover, although the convex part 2 demonstrated the case where it forms by giving press work with respect to the guide surface 1a1, the formation direction of the convex part 2 is not limited to press work. For example, the convex part 2 may be formed by fixing the convex part 2 on the guide surface 1a1. The material constituting the convex portion 2 may be the same as or different from the material constituting the guide surface 1a1. The material constituting the convex portion 2 may be, for example, a resin or a metal.

Next, the effect of the rolling bearing according to the embodiment of the present invention will be described.
According to the rolling bearing 10 according to the embodiment, at least one of the plurality of pockets 9 is provided with the convex portions 2 on the guide surfaces 1a1 and 1b1. Thereby, since the ball 3 as the rolling element and the cage 7 are not in surface contact but in point contact, the sliding wear resistance is reduced as compared with the case where the convex portions 2 are not provided on the guide surfaces 1a1 and 1b1. Can be made. As a result, wear of the guide surfaces 1a1 and 1b1 can be suppressed.

  Moreover, according to the rolling bearing 10 which concerns on embodiment, the convex part 2 is provided in all the several pockets 9. As shown in FIG. Thereby, in all the pockets 9, wear of the guide surfaces 1a1, 1b1 can be suppressed.

  Furthermore, according to the rolling bearing 10 which concerns on embodiment, the convex part 2 sees from the center O1 of the ball | bowl 3, and the 1st convex part 2a provided in the one side of the circumferential direction P, and the other side of the circumferential direction P And the second convex portion 2b. Thereby, the ball 3 can make point contact with the cage 7 both when the ball 3 advances in the circumferential direction P with respect to the cage 7 and when the ball 3 is delayed. Therefore, wear of the guide surfaces 1a1, 1b1 can be further suppressed.

  Furthermore, according to the rolling bearing 10 according to the embodiment, the angle θ formed by the straight line L1 passing through the convex portion 2 and the center O1 of the ball 3 and the circumferential tangent line L2 passing through the center O1 of the ball 3 is 10 ° or less. It is. Thereby, when the ball 3 advances in the circumferential direction P with respect to the cage 7 or is delayed, the ball 3 is likely to make point contact with the cage 7. Therefore, wear of the guide surfaces 1a1, 1b1 can be further suppressed.

  Further, according to the rolling bearing 10 according to the embodiment, the shape of the convex portion 2 may be a long and thin shape extending in the radial direction R of the cage 7 when viewed from the center O1 of the ball 3. Thereby, even when the ball 3 moves in the radial direction R of the cage 7, the ball 3 can make point contact with the cage 7. Therefore, wear of the guide surfaces 1a1, 1b1 can be further suppressed.

  Furthermore, according to the rolling bearing 10 which concerns on embodiment, even if the convex part 2 has the 3rd convex part 2c and the 4th convex part 2d which are arrange | positioned so that it may space apart in the radial direction R of the holder | retainer 7. FIG. Good. Thereby, even when the ball 3 moves relative to the radial direction of the cage 7, the ball 3 can make point contact with the cage 7. Therefore, wear of the guide surfaces 1a1, 1b1 can be further suppressed.

  Furthermore, according to the rolling bearing 10 which concerns on embodiment, the part of the convex part 2 which contacts the ball | bowl 3 may be a curved surface. Thereby, abrasion of the guide surfaces 1a1 and 1b1 can be effectively suppressed.

  Furthermore, according to the rolling bearing 10 which concerns on embodiment, the part of the convex part 2 which contacts the ball | bowl 3 may be a plane. Thereby, abrasion of the guide surfaces 1a1 and 1b1 can be effectively suppressed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 annular body, 1a first annular body, 1a1 first guide surface (guide surface), 1a2 first contact surface, 1a3 first outer surface, 1b second annular body, 1b1 second guide surface (guide surface), 1b2 first 2 contact surface, 1b3 second outer surface, 2 convex portion, 2a1, 2a2, 2a first convex portion, 2b1, 2b2, 2b second convex portion, 2c third convex portion, 2d fourth convex portion, 2e top surface, 2f side face, 3 balls, 4 outer ring, 5 inner ring, 6 shafts, 7 cage, 8 recess, 8a bottom face, 8b side face, 9 pocket, 10 rolling bearing, 11a first through hole, 11b second through hole, 12 rivets, A Axial direction, L1 straight line, L2 tangent, O1, O2 center, P circumferential direction, R radial direction.

Claims (8)

Inner ring,
An outer ring disposed on the outer peripheral side of the inner ring;
A plurality of balls disposed between the inner ring and the outer ring;
A cage configured to hold each of the plurality of balls and including a plurality of pockets including a guide surface facing the ball along the circumferential direction;
A rolling bearing, wherein at least one of the plurality of pockets is provided with a convex portion on the guide surface.   The rolling bearing according to claim 1, wherein the convex portion is provided in all of the plurality of pockets.   The said convex part has the 1st convex part provided in the one side of the said circumferential direction, and the 2nd convex part provided in the other side of the said circumferential direction seeing from the center of the said ball | bowl. Or the rolling bearing of Claim 2.   The angle which the straight line which passes along the said convex part and the center of the said ball | bowl, and the said circumferential tangent line which passes along the center of the said ball | bowl is 10 degrees or less, The any one of Claims 1-3. Rolling bearings.   The rolling bearing according to any one of claims 1 to 4, wherein a shape of the convex portion is a long and narrow shape extending in a radial direction of the cage as viewed from the center of the ball.   The rolling bearing according to any one of claims 1 to 4, wherein the convex portion includes a third convex portion and a fourth convex portion arranged so as to be separated from each other in a radial direction of the cage.   The rolling bearing according to any one of claims 1 to 6, wherein a portion of the convex portion that contacts the ball is a curved surface.   The rolling bearing according to claim 1, wherein a portion of the convex portion that contacts the ball is a flat surface.

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