JP2020153391A - Inner ring separation-type angular ball bearing - Google Patents

Abstract

To provide an inner ring separation-type angular ball bearing which can smoothly attach an outer ring assembly to an inner ring, and is less likely to be damaged at a surface of a ball.SOLUTION: An inner ring separation-type angular ball bearing has: a straight face 25 in which an internal peripheral face of a column part 14 of a holder 4 extends toward a side of an anti-counter side annular part 13 from a counter-side annular part 12 in an axial direction; and a tapered face 26 which is gradually expanded in a diameter toward the anti-counter side annular part 13 from the straight face 25. An opening edge of a pocket 15 at the inside in a radial direction forms a pair of protrusive edge parts 33 protruding to the inside of the pocket 15 in a boundary position between the straight face 25 and the tapered face 26 when viewed in the radial direction, and when moving balls 3 to the inside of the radial direction by separating the balls 3 from the inner ring 2, the come-off and a fall of the balls 3 are prohibited by a pair of the protrusive edge parts 33 and the anti-counter side annular part 13 while receiving them.SELECTED DRAWING: Figure 2

Description

The present invention relates to an inner ring separated type angular contact ball bearing configured so that the balls do not fall out radially inward from the pocket of the cage when the inner rings are separated.

Conventionally, bearings used in automatic transmissions of automobiles are often subjected to tapered roller bearings because not only radial loads but also axial loads are applied. However, in recent years, due to the need for fuel efficiency of automobiles, the use of angular contact ball bearings as transmission bearings is increasing. Angular contact ball bearings can carry a radial load and one axial load, and have lower torque than tapered roller bearings.

When angular contact ball bearings are used in the transmission, separate angular contact ball bearings are generally used to ensure workability in assembling and disassembling the transmission. The separate type angular contact ball bearing is an angular contact ball bearing configured so that the ball does not fall out of the pocket of the cage even when the inner ring or the outer ring is separated.

As the separate type angular contact ball bearing, for example, the inner ring separated type angular contact ball bearing of Patent Document 1 is known. The inner ring-separated angular contact ball bearing of Patent Document 1 includes an outer ring, an inner ring coaxially arranged inside the outer ring in the radial direction, and a plurality of balls incorporated between the outer ring and the inner ring at intervals in the circumferential direction. It is equipped with a cage that holds the balls. On the outer circumference of the inner ring, there are an inner ring raceway groove in which balls roll and contact, an inner ring counter bore portion adjacent to one side of the inner ring raceway groove in the axial direction, and an inner ring shoulder portion adjacent to the other side in the axial direction of the inner ring raceway groove. Is provided. The inner ring counter bore portion is a portion having a shape obtained by removing a part or all of the groove shoulder of the inner ring raceway groove.

The cage surrounds the counter-side annular portion extending in the circumferential direction on one side in the axial direction (the side of the inner ring counter bore portion) with respect to the ball and the other side in the axial direction (the side of the inner ring shoulder portion) with respect to the ball. It has an anti-counter-side annular portion extending in the direction, and a plurality of pillar portions that pass between the balls and connect the counter-side annular portion and the anti-counter-side annular portion. The counter-side annular portion, the counter-side annular portion, and the pillar portion divide a pocket for accommodating balls.

Here, the inner diameter of the counter-side annular portion is larger than the inner diameter of the counter-side annular portion. Further, the inner peripheral surface of the pillar portion is a tapered surface whose diameter gradually increases from the counter-side annular portion to the counter-counter-side annular portion. The radial inner opening of the pocket is narrower than the size of the ball so that the ball does not fall out radially inward from the cage pocket even when the inner ring is separated.

Japanese Unexamined Patent Publication No. 2008-95929

The inventor of the present application used the inner ring separated type angular contact ball bearing having the configuration of Patent Document 1 for the transmission, and when the work of assembling the inner ring separated type angular contact ball bearing was performed, the outer ring, a plurality of balls, and the cage were integrated. I noticed that it is difficult to attach what is held in the bearing (hereinafter referred to as "outer ring assembly") to the outer circumference of the inner ring, and the surface of the ball may be scratched.

That is, when assembling the inner ring separated type angular contact ball bearing to the object, first, the outer ring assembly is fitted into the housing hole, while the inner ring is mounted on the outer circumference of the shaft body. Next, the outer ring assembly is attached to the outer circumference of the inner ring. Here, when the outer ring assembly is fitted into the housing hole, the ball of the outer ring assembly is held in the pocket of the cage so as not to fall out radially inward from the pocket of the cage, but the ball is held inside the pocket. It is possible to move freely with. At this time, when the ball moves to a position where it can be received by the opening edge inside the pocket in the radial direction due to the weight of the ball, the inscribed circle diameter of the ball (the diameter of the virtual circle inscribed in common to a plurality of balls) becomes smaller. After that, when the outer ring assembly is attached to the outer circumference of the inner ring (relatively, the inner ring is inserted into the outer ring assembly), the ball is caught and does not move smoothly outward in the radial direction, making it difficult to attach the outer ring assembly. There is. In this case, it was found that if the outer ring assembly is forcibly pushed in, the surface of the ball may be scratched.

An object to be solved by the present invention is to provide an inner ring separated type angular contact ball bearing in which the outer ring assembly can be smoothly mounted on the inner ring and the surface of the ball is not easily scratched.

In order to solve the above problems, the present invention provides an inner ring separated type angular contact ball bearing having the following configuration.
With the outer ring
An inner ring coaxially arranged inside the outer ring in the radial direction,
A plurality of balls incorporated between the outer ring and the inner ring at intervals in the circumferential direction,
A cage for holding the plurality of balls, and a cage for holding the plurality of balls.
On the outer circumference of the inner ring, an inner ring raceway groove with which the ball rolls and contacts, an inner ring counter bore portion adjacent to one side of the inner ring raceway groove in the axial direction, and an inner ring counter bore portion adjacent to the other side of the inner ring raceway groove in the axial direction are adjacent to each other. , An inner ring shoulder portion having an outer diameter larger than that of the inner ring counter bore portion is provided.
The cage extends on one side in the axial direction with respect to the ball in the circumferential direction, and has a counter-side annular portion having an inner diameter smaller than the outer diameter of the inner ring shoulder portion, and the cage in the axial direction with respect to the ball. An anti-counter-side annular portion extending in the circumferential direction on the other side and having an inner diameter larger than the outer diameter of the inner ring shoulder portion, and the counter-side annular portion and the anti-counter-side annular portion passing between the plurality of balls. Has multiple pillars that connect the
A pocket for accommodating the ball is partitioned between the counter-side annular portion, the counter-counter-side annular portion, and the pillar portion.
The pocket is an inner ring-separated angular contact ball bearing having a shape in which the ball does not fall out from the pocket in the radial direction when the inner ring is separated.
A straight surface in which the inner peripheral surface of the pillar portion extends axially from the counter-side annular portion toward the counter-counter-side annular portion, and a taper that gradually expands in diameter from the straight surface toward the counter-counter-side annular portion. Has a face and
The radial inner opening edge of the pocket forms a pair of convex edges protruding inward of the pocket at the boundary position between the straight surface and the tapered surface when viewed in the radial direction.
When the inner ring is separated and the ball is moved inward in the radial direction, the pair of convex edge portions and the counter-counter side annular portion catch the ball to prevent the ball from falling off. To do
Inner ring separated type angular contact ball bearing.

In this way, when the inner ring is separated and the ball is moved inward in the radial direction, the ball is received by a pair of convex edges formed on the opening edge in the radial direction of the pocket. It is possible to prevent the inscribed circle diameter from becoming smaller. Therefore, when the outer ring assembly (the outer ring, a plurality of balls, and the cage are integrally held) can be mounted smoothly on the outer circumference of the inner ring, the cycle time for assembling the angular contact ball bearing can be shortened. It is possible to do. In addition, the surface of the ball is not easily scratched even when the angular contact ball bearing is assembled in a short cycle time.

When the inner ring is separated and the ball is moved inward in the radial direction and the ball is received by the pair of convex edge portions and the counter-counter side annular portion, the contact position of the convex edge portion with respect to the ball It is preferable to arrange the convex edge portion so that the axial distance from the center position of the ball is within 10% of the diameter of the ball.

In this way, when the inner ring is separated and the ball is moved inward in the radial direction, the ball is received by the convex edge portion at or near the axial center of the ball, so that the inscribed circle diameter of the ball is small. It becomes possible to effectively suppress the formation.

The diameter of the pillar portion is the diameter of the ball from the position of the pitch circle that commonly passes through the center of the ball with the ball incorporated between the outer ring and the inner ring to the straight surface. It is preferable to form it so as to be in the range of 30% or more and 50% or less of.

If the radial thickness from the position of the pitch circle of the pillar to the straight surface is 30% or more of the diameter of the ball, the axial distance between the pair of convex edges can be particularly narrowed, so the inner ring is separated. It is possible to particularly effectively prevent the inscribed circle diameter of the ball from becoming smaller when the ball is moved inward in the radial direction.

The axial distance between the pair of convex edges is preferably set to 65% or less of the diameter of the ball.

In this way, when the inner ring is separated and the ball is moved inward in the radial direction, it is possible to particularly effectively suppress the reduction of the inscribed circle diameter of the ball.

The opening edges on the inner side of the pocket in the radial direction are formed on both ends of the semicircular first edge portion that opens toward the counter-counter side annular portion and the semicircular first edge portion when viewed in the radial direction. Adopting a configuration having a pair of opposed second edge portions connected to both ends of the first edge portion so that the convex edge portion is formed and whose width widens toward the counter-counter side annular portion. Can be done.

It is preferable that the outer peripheral surface of the inner ring counter bore portion is formed in a tapered shape in which the outer diameter gradually decreases as the distance from the inner ring raceway groove increases.

In this way, when the outer ring assembly is attached to the outer circumference of the inner ring, the ball is pushed outward in the radial direction by the taper of the outer peripheral surface of the inner ring counter bore portion. Therefore, the outer ring assembly can be attached to the inner ring particularly smoothly, and the surface of the ball is not easily scratched.

In this case, the outer diameter of the outer peripheral surface of the inner ring counter bore portion from the inner ring raceway groove is such that the inner ring is separated and the ball is moved inward in the radial direction, and the ball is moved to the pair of convex edge portions. It is preferable to set the diameter smaller than the inscribed circle diameter of the ball when it is received by the counter-counter side annular portion.

By doing so, the outer diameter of the portion of the outer peripheral surface of the inner ring counter bore portion farthest from the inner ring raceway groove is smaller than the inscribed circle diameter of the ball, so that when the outer ring assembly is mounted on the outer circumference of the inner ring, it is surely performed. The tapered outer peripheral surface of the inner ring counter bore allows the ball to be pushed outward in the radial direction. Therefore, the work of attaching the outer ring assembly to the inner ring becomes extremely smooth, and it is possible to reliably prevent the surface of the ball from being scratched.

It is preferable that the counter-side annular portion, the counter-counter-side annular portion, and the pillar portion are formed of resin.

In this way, the cage can be manufactured at low cost.

The inner ring separated type angular contact ball bearing having the above configuration is particularly suitable for use as a bearing for an automobile transmission.

In the inner ring separation type angular contact ball bearing of the present invention, when the inner ring is separated and the ball is moved inward in the radial direction, the ball is formed by a pair of convex edges formed on the opening edge in the radial direction of the pocket. Since it is received, it is possible to prevent the inscribed circle diameter of the ball from becoming smaller. Therefore, when the outer ring assembly is mounted on the outer circumference of the inner ring, it can be mounted smoothly, and the cycle time of the assembly work of the angular contact ball bearing can be shortened. In addition, the surface of the ball is not easily scratched even when the angular contact ball bearing is assembled in a short cycle time.

Sectional drawing which shows the inner ring separated type angular contact ball bearing which concerns on embodiment of this invention. When the inner ring of the angular contact ball bearing shown in FIG. 1 is separated and the ball is moved inward in the radial direction, the ball is received by a pair of convex edge portions of the cage and an annular portion on the counter side. Partially enlarged cross section of the ball and cage A view of the ball and the cage shown in FIG. 2 from the outside in the radial direction. A view of the ball and the cage shown in FIG. 2 from the inside in the radial direction. Cross-sectional view of the ball and cage shown in FIG. 2 broken along a plane orthogonal to the axial direction including a pitch circle. Partially enlarged cross-sectional view of the inner ring of the angular contact ball bearing shown in FIG. A cross-sectional view showing a state in which two angular contact ball bearings (first and second angular contact ball bearings) shown in FIG. 1 are prepared, and the outer ring assembly of the second angular contact ball bearing is mounted in a housing hole. After the state shown in FIG. 7, a cross-sectional view showing a state in which the outer ring assembly of the first angular contact ball bearing is mounted in the housing hole. A cross-sectional view showing a process of mounting the outer ring assembly of the first angular contact ball bearing on the outer circumference of the first inner ring after the state shown in FIG. A cross-sectional view showing a process of inserting the second inner ring into the outer ring assembly of the second angular contact ball bearing after the state shown in FIG. Cross-sectional view showing an inner ring separated type angular contact ball bearing of a comparative example A ball showing a state in which the inner ring of the angular contact ball bearing shown in FIG. 11 is separated and the ball is moved inward in the radial direction, and the ball is received by the counter-side annular portion and the counter-counter-side annular portion of the cage. And a partially enlarged cross section of the cage A cross-sectional view showing an example of an automobile transmission incorporating the angular contact ball bearing shown in FIG.

FIG. 1 shows an inner ring separated type angular contact ball bearing A according to an embodiment of the present invention. The angular contact ball bearing A includes an outer ring 1, an inner ring 2 coaxially arranged inside the outer ring 1 in the radial direction, and a plurality of balls 3 incorporated between the outer ring 1 and the inner ring 2 at intervals in the circumferential direction. It has a cage 4 for holding a plurality of balls 3.

On the inner circumference of the outer ring 1, the outer ring raceway groove 5 on which the balls 3 roll and contact, the outer ring shoulder portion 6 adjacent to one side (left side in the figure) of the outer ring raceway groove 5 in the axial direction, and the shaft of the outer ring raceway groove 5 An outer ring counter bore portion 7 adjacent to the other side in the direction (right side in the figure) is provided. The outer ring raceway groove 5 is a groove having an arcuate cross section extending in the circumferential direction on the inner circumference of the outer ring 1. The outer ring 1 is made of bearing steel.

The outer ring counter bore portion 7 is a portion having a shape in which a part or all of the groove shoulder of the outer ring raceway groove 5 is removed. The inner diameter of the outer ring counter bore portion 7 is larger than the inner diameter of the outer ring shoulder portion 6. In the outer ring counter bore portion 7, the radial height from the groove bottom of the outer ring raceway groove 5 (the portion where the inner surface diameter of the outer ring raceway groove 5 is maximum) to the inner circumference of the outer ring counter bore portion 7 is the diameter D of the ball 3. It is formed so as to be in the range of 2 to 10% (preferably 4 to 8%) of. The axial distance from the center of the ball 3 to the side surface of the outer ring 1 on the outer ring counter bore portion 7 side is shorter than the axial distance from the center of the ball 3 to the side surface of the outer ring 1 on the outer ring shoulder portion 6 side. It has become. Further, the axial distance from the center of the ball 3 to the side surface of the outer ring 1 on the side of the outer ring counter bore portion 7 is shorter than the radius of the ball 3.

On the outer circumference of the inner ring 2, the inner ring raceway groove 8 in which the balls 3 roll and contact, the inner ring counter bore portion 9 adjacent to one side (left side in the figure) of the inner ring raceway groove 8 in the axial direction, and the shaft of the inner ring raceway groove 8 An inner ring shoulder portion 10 adjacent to the other side in the direction is provided. The inner ring raceway groove 8 is a groove having an arcuate cross section extending in the circumferential direction on the outer circumference of the inner ring 2. The inner ring 2 is made of bearing steel.

The inner ring counter bore portion 9 is a portion having a shape in which a part or all of the groove shoulder of the inner ring raceway groove 8 is removed. The outer diameter of the inner ring shoulder portion 10 is larger than the outer diameter of the inner ring counter bore portion 9. The outer peripheral surface 11 of the inner ring counter bore portion 9 is formed in a tapered shape in which the outer diameter gradually decreases as the distance from the inner ring raceway groove 8 increases. The inner ring counter bore portion 9 has a diameter from the groove bottom of the inner ring raceway groove 8 (the portion where the diameter of the inner surface of the inner ring raceway groove 8 is the smallest) to the outer circumference of the end portion of the inner ring counter bore portion 9 on the inner ring raceway groove 8 side. The height in the direction is formed so as to be in the range of 0 to 5% (preferably 1 to 3%) of the diameter D of the ball 3. The axial distance from the center of the ball 3 to the side surface of the inner ring 2 on the inner ring counter bore portion 9 side is longer than the radius of the ball 3. Further, the axial distance from the center of the ball 3 to the side surface of the inner ring 2 on the inner ring shoulder portion 10 side is longer than the radius of the ball 3. The ball 3 is a steel ball.

The cage 4 has a counter-side annular portion 12 extending in the circumferential direction on one side (left side in the figure) in the axial direction with respect to the ball 3, and a circumferential direction on the other side (right side in the figure) in the axial direction with respect to the ball 3. It has an anti-counter-side annular portion 13 extending in the circumferential direction, and a plurality of pillar portions 14 connecting the counter-side annular portion 12 and the anti-counter-side annular portion 13 by passing between adjacent balls 3 in the circumferential direction. The counter-side annular portion 12, the anti-counter-side annular portion 13, and the pillar portion 14 partition a pocket 15 for accommodating the ball 3.

The counter-side annular portion 12, the counter-counter-side annular portion 13, and the pillar portion 14 are integrally formed of resin and seamlessly. Polyamide can be adopted as the resin. As the polyamide, super engineering plastics such as PA46 (polyamide 46), PA66 (polyamide 66), and PA9T (polynonamethylene terephthalamide) can be used. It is also possible to use polyetheretherketone (PEEK), polyphenylene sulfide (PPS), or the like instead of polyamide. Further, a fiber reinforcing material (glass fiber, carbon fiber, aramid fiber, etc.) is added to the synthetic resin constituting the cage 4. When PA46, PA66, and PPS are adopted, the heat resistance of the cage 4 can be ensured when the angular contact ball bearing A is used in an automobile transmission. The cage 4 can be formed by shaving the resin, but the cost is low when the cage 4 is formed by injection molding of the resin.

The counter-side annular portion 12 and the counter-counter-side annular portion 13 are fitted to the ball 3 to position the cage 4. That is, the counter-side annular portion 12 has a cross section orthogonal to the circumferential direction, and is the center of the pitch circle P (a state in which a plurality of balls 3 are incorporated between the outer ring 1 and the inner ring 2) on the surface of the balls 3. It has an arc-shaped pocket inner surface 16 that fits into a portion radially inside the virtual circle that passes through in common), and the counter-counter side annular portion 13 is a cross section of the surface of the ball 3 that is orthogonal to the circumferential direction. Among them, it has an arc-shaped pocket inner surface 17 that fits into a portion radially outside the pitch circle P. Then, the pocket inner surface 16 of the counter-side annular portion 12 and the pocket inner surface 17 of the counter-side annular portion 13 are fitted to the ball 3, so that the cage 4 is positioned in both the radial direction and the axial direction. ing. The counter-side annular portion 12 is non-contact with both the outer ring 1 and the inner ring 2, and the counter-side annular portion 13 is also non-contact with both the outer ring 1 and the inner ring 2.

The inner diameter of the counter-side annular portion 12 is smaller than the outer diameter of the inner ring shoulder portion 10. The outer diameter of the counter-counter side annular portion 13 is larger than the inner diameter of the outer ring shoulder portion 6. The inner diameter of the counter-side annular portion 13 is the same as or larger than the outer diameter of the counter-side annular portion 12.

As shown in FIG. 2, the pillar portion 14 has an outer diameter side pillar portion 20 extending axially from the counter side annular portion 13 toward the counter side annular portion 12 and an anti-counter side annular portion 12 from the counter side annular portion 12. It is composed of an inner diameter side pillar portion 21 extending in the axial direction toward the portion 13. The outer diameter side pillar portion 20 is formed so that the size of the cross section orthogonal to the axial direction (left-right direction in the figure) gradually decreases from the side of the counter-side annular portion 13 toward the counter-side annular portion 12. The inner diameter side pillar portion 21 is formed so that the size of the cross section orthogonal to the axial direction gradually decreases from the counter side annular portion 12 side toward the counter counter side annular portion 13. The outer diameter side pillar portion 20 and the inner diameter side pillar portion 21 are arranged adjacent to each other in the radial direction (vertical direction in the figure), and are integrally molded with resin without any seams.

The outer peripheral surface 22 of the outer diameter side pillar portion 20 is formed in a tapered shape in which the diameter gradually decreases from the side of the counter-side annular portion 13 to the side of the counter-side annular portion 12. The circumferential side surface of the outer diameter side pillar portion 20 has a concave spherical surface 23 formed in an axial range on the side of the counter-side annular portion 13 with respect to the position of the pitch circle P, and an annular surface on the counter side with respect to the position of the pitch circle P. It is composed of a concave cylindrical surface 24 formed in an axial range on the side of the portion 12. The concave spherical surface 23 is a concave spherical surface along the surface of the ball 3 at the position of the pitch circle P. The concave cylindrical surface 24 is a concave cylindrical surface extending in the axial direction about the ball 3 at the position of the pitch circle P. The concave spherical surface 23 and the concave cylindrical surface 24 are connected at an axial position corresponding to the pitch circle P.

The inner peripheral surface of the inner diameter side pillar portion 21 has a straight surface 25 extending axially from the counter-side annular portion 12 toward the counter-counter-side annular portion 13 and gradually extending from the straight surface 25 toward the counter-counter-side annular portion 13. It has a tapered surface 26 that expands in diameter. In the figure, the straight surface 25 is a constant cylindrical surface whose inner diameter does not change along the axial direction. In the figure, the tapered surface 26 is a conical surface whose inner diameter expands at a constant rate from the side of the counter-side annular portion 12 to the side of the counter-side annular portion 13.

The straight surface 25 and the tapered surface 26 are formed so as to change their angles at or near the same axial position as the center position of the pocket 15. Specifically, the axial distance between the boundary position between the straight surface 25 and the tapered surface 26 and the center position of the pocket 15 (the position of the pitch circle P) is 10% or less (preferably) of the diameter D of the ball 3. The boundary between the straight surface 25 and the tapered surface 26 is set so as to be within 7% or less, more preferably 4% or less). The figure shows an example in which the axial distance between the boundary position between the straight surface 25 and the tapered surface 26 and the center position of the pocket 15 (the position of the pitch circle P) is zero.

The circumferential side surface of the inner diameter side pillar portion 21 has a concave spherical surface 27 formed in an axial range on the counter side annular portion 12 side from the position of the pitch circle P, and an annular portion on the counter side opposite to the position of the pitch circle P. It is composed of a concave cylindrical surface 28 formed in the axial range on the side of 13 and a ball introduction surface 29 formed adjacent to the radial outer side of the concave spherical surface 27. The concave spherical surface 27 is a concave spherical surface along the surface of the ball 3 at the position of the pitch circle P. The concave cylindrical surface 28 is a concave cylindrical surface extending in the axial direction about the ball 3 at the position of the pitch circle P. The concave spherical surface 27 and the concave cylindrical surface 28 are connected at an axial position corresponding to the pitch circle P. The ball introduction surface 29 is a concave cylindrical surface provided to prevent the ball 3 from interfering with the radial outer opening edge of the pocket 15 when the ball 3 is inserted into the pocket 15 from the radial outside. is there.

In the pillar portion 14, the radial thickness T from the position of the pitch circle P to the straight surface 25 is 30% or more and 50% or less (preferably 35% or more and less than 50%, more preferably 40%) of the diameter D of the ball 3. It is formed so as to be in the range of more than 50%).

As shown in FIG. 4, the radially inner opening edge of the pocket 15 is a semicircular first edge portion 31 that opens toward the counter-counter side annular portion 13 and the first edge portion when viewed in the radial direction. It has a pair of opposed second edge portions 32 that are connected to both ends of 31 and whose width widens toward the counter-counter side annular portion 13. The first edge portion 31 is an intersecting ridge between the straight surface 25 and the inner surface (concave spherical surface 27) of the pocket 15, and the second edge portion 32 is a tapered surface 26 and the inner surface of the pocket 15 (concave cylindrical surface 28). It is a crossing ridge.

The radial inner opening edge of the pocket 15 is a pair of convex edges protruding inward of the pocket 15 at the boundary position between the straight surface 25 and the tapered surface 26 (positions at both ends of the first edge portion 31) when viewed in the radial direction. The portion 33 is formed. The axial distance W of the pair of convex edge portions 33 is smaller than the diameter D of the ball 3. As a result, as shown in FIGS. 2, 3, and 5, when the inner ring 2 is separated and the ball 3 is moved radially inward from the position of the pitch circle P, the pair of convex edge portions 33 and the counter counter The ball 3 is received by the side annular portion 13 so that the ball 3 does not fall out from the pocket 15 inward in the radial direction.

Here, as shown in FIG. 4, the axial distance W of the pair of convex edge portions 33 is set to 65% or less (preferably 60% or less, more preferably 55% or less) of the diameter D of the balls 3. There is. Further, when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction from the position of the pitch circle P, and the ball 3 is received by the pair of convex edge portions 33 and the counter-counter side annular portion 13, the ball 3 is received. The axial distance g between the contact position of the convex edge portion 33 and the center position of the ball 3 is within 10% or less (preferably 7% or less, more preferably 4% or less) of the diameter D of the ball 3. The convex edge portion 33 is arranged on the.

As shown in FIG. 6, the tapered outer peripheral surface 11 of the inner ring counter bore portion 9 is inclined at an angle θ with respect to the axial direction (left-right direction in the figure). The size of the angle θ is set to a size in the range of 5 ° or more and less than 20 °. The outer diameter H of the portion of the outer peripheral surface 11 of the inner ring counter bore portion 9 farthest from the inner ring raceway groove 8 is smaller than the outer diameter I of the end portion of the outer peripheral surface 11 of the inner ring counter bore portion 9 on the inner ring raceway groove 8. .. Further, as shown in FIG. 2, the outer diameter H of the portion of the outer peripheral surface 11 of the inner ring counter bore portion 9 farthest from the inner ring raceway groove 8 is such that the inner ring 2 is separated and the ball 3 is radially oriented from the position of the pitch circle P. The inscribed circle diameter F of the ball 3 when the ball 3 is moved inward and received by the pair of convex edge portions 33 and the counter-side annular portion 13 (a virtual cylinder inscribed in common with a plurality of balls 3). Smaller than (diameter). The outer diameter H of the portion of the outer peripheral surface 11 of the inner ring counter bore portion 9 farthest from the inner ring raceway groove 8 is 2 mm or more larger than the inner diameter of the inner ring 2.

At the intersecting ridge (the corner portion on the outer side in the axial direction of the inner ring counter bore portion 9) between the outer peripheral surface 11 of the inner ring counter bore portion 9 and the side surface of the inner ring 2 on the side of the inner ring counter bore portion 9, with respect to the axial direction. A chamfer 34 that inclines at an angle of 40 ° to 50 ° is provided.

The angular contact ball bearing of this embodiment is used in combination with the first angular contact ball bearing A and the second angular contact ball bearing B so that it can receive axial loads in both directions, for example, as shown in FIG. To do. The first angular contact ball bearing A and the second angular contact ball bearing B are angular contact ball bearings having exactly the same configuration, but are mounted so that the directions in which the axial load can be applied are opposite to each other.

An example of the work of assembling the first angular contact ball bearing A and the second angular contact ball bearing B to the object will be described. In the following description, the member prefixed with "first" is a component of the first angular contact ball bearing A, and the member prefixed with "second" is the second angular contact ball bearing B. It is a component of.

First, as shown in FIG. 7, the second outer ring assembly B'(the outer ring 1 and the plurality of balls 3 and the cage 4 are integrally held) is fitted into the housing hole 40 provided in the object. .. At this time, the second outer ring assembly B'is inserted into the housing hole 40 so that the counter-side annular portion 13 of the cage 4 is on the upper side and the counter-side annular portion 12 is on the lower side. Further, the outer ring 1 of the second outer ring assembly B'is fitted to the inner circumference of the housing hole 40 with a tightening allowance.

Next, as shown in FIG. 8, the retaining ring 42 is mounted on the retaining ring groove 41 formed on the inner circumference of the housing hole 40. The position of the outer ring 1 of the second outer ring assembly B'is fixed by the retaining ring 42. After that, the first outer ring assembly A'is fitted into a portion of the housing hole 40 below the second outer ring assembly B'. At this time, the first outer ring assembly A'is inserted into the housing hole 40 so that the counter-side annular portion 12 of the cage 4 is on the upper side and the counter-counter-side annular portion 13 is on the lower side. Further, the outer ring 1 of the first outer ring assembly A'is fitted to the inner circumference of the housing hole 40 with a tightening allowance.

On the other hand, as shown in FIG. 9, the first inner ring 2 is mounted on the outer circumference of the shaft body 43. At this time, the first inner ring 2 is mounted on the outer periphery of the shaft body 43 with the inner ring counter bore portion 9 facing upward and the inner ring shoulder portion 10 facing downward. Further, the first inner ring 2 is fitted to the outer periphery of the shaft body 43 with a tightening allowance. After that, the first outer ring assembly A'is attached to the outer circumference of the first inner ring 2 from above. By this mounting, the first angular contact ball bearing A is in a completed state.

After that, as shown in FIG. 10, the second inner ring 2 is inserted into the second outer ring assembly B'from the upper side with the inner ring counter bore portion 9 on the lower side and the inner ring shoulder portion 10 on the upper side. At this time, the second inner ring 2 is fitted to the outer circumference of the shaft body 43 with a tightening allowance. As a result, the second angular contact ball bearing B is in a completed state.

As described above, the first angular contact ball bearing A and the second angular contact ball bearing B can be assembled to the object.

By the way, as shown in FIG. 8, when the first outer ring assembly A'is attached to the housing hole 40, the ball 3 of the first outer ring assembly A'does not fall out radially inward from the pocket 15 of the cage 4. Although it is held in the pocket 15 of the cage 4 as described above, the ball 3 can move freely inside the pocket 15 of the cage 4 of the first outer ring assembly A'. Then, as shown in FIG. 8, the mounting direction of the first outer ring assembly A'is such that the counter-side annular portion 12 of the cage 4 is on the upper side and the counter-side annular portion 13 is on the lower side. Due to the weight of the ball 3, the ball 3 moves to a position where it can be received by the opening edge on the inner side in the radial direction of the pocket 15, and the inscribed circle diameter of the ball 3 becomes smaller.

Here, as in the comparative example shown in FIG. 11, the inner peripheral surface 44 of the pillar portion 14 of the cage 4 becomes a tapered surface whose diameter gradually increases from the counter-side annular portion 12 toward the counter-counter-side annular portion 13. In this case, as shown in FIG. 12, when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction, the ball 3 is received by the counter-side annular portion 12 and the counter-counter-side annular portion 13. The inscribed circle diameter F of the ball 3 becomes considerably smaller. Therefore, when the outer ring assembly is attached to the outer circumference of the inner ring 2 (relatively, the inner ring 2 is inserted into the outer ring assembly), the ball 3 is caught and does not move smoothly outward in the radial direction, and the outer ring assembly is attached. It can be difficult. In this case, when the outer ring assembly is forcibly pushed in, the ball 3 becomes, for example, an axially outer corner portion of the inner ring counter bore portion 9 of the inner ring 2, or a corner portion of the boundary between the outer ring shoulder portion 6 and the outer ring raceway groove 5. It may be pressed and the surface of the ball 3 may be scratched.

On the other hand, in the angular contact ball bearing A of this embodiment, as shown in FIG. 2, when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction, the ball 3 has the diameter of the pocket 15. Since it is received by the pair of convex edge portions 33 formed on the opening edge inside the direction, it is possible to prevent the inscribed circle diameter F of the ball 3 from becoming small. Therefore, as shown in FIG. 9, the first outer ring assembly A'is attached to the outer periphery of the first inner ring 2 from above (relatively, the first inner ring 2 is attached to the first outer ring assembly A'on the lower side. When inserting from), the balls 3 move smoothly outward in the radial direction, making it easy to attach the first outer ring assembly A'to the inner ring 2, and assembling the first and second angular contact ball bearings A and B. The work cycle time can be shortened. Further, the ball 3 is, for example, an axially outer corner portion of the inner ring counter bore portion 9 of the first inner ring 2, or a corner portion of the boundary between the outer ring shoulder portion 6 of the first outer ring assembly A'and the outer ring raceway groove 5. It is possible to prevent the situation of being pressed against the ball 3 and prevent the surface of the ball 3 from being scratched.

Further, in the angular contact ball bearing A, when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction, and the ball 3 is received by the pair of convex edge portions 33 and the counter-counter side annular portion 13, the figure is shown. As shown in 4, the axial distance g between the contact position of the convex edge 33 with respect to the ball 3 and the center position of the ball 3 is 10% or less (preferably 7% or less, more preferably 7% or less) of the diameter D of the ball 3. Is less than 4%). That is, since the ball 3 is received by the convex edge portion 33 at or near the axial center of the ball 3, when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction, the inscribed circle of the ball 3 is formed. It is possible to effectively suppress the decrease in diameter F.

Further, as shown in FIG. 2, in this angular contact ball bearing A, the radial thickness T from the position of the pitch circle P to the straight surface 25 is 30% or more (preferably 35% or more) of the diameter D of the ball 3. Since the pillar portion 14 is formed so as to be more preferably 40% or more), the axial distance W of the pair of convex edge portions 33 shown in FIG. 4 can be particularly narrowed. Therefore, when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction, it is possible to particularly effectively suppress the inscribed circle diameter F of the ball 3 from becoming small.

Further, as shown in FIG. 2, in this angular contact ball bearing A, the axial spacing W of the pair of convex edge portions 33 is 65% or less (preferably 60% or less, more preferably 55% or less) of the diameter D of the balls 3. Since it is set to (below), it is possible to particularly effectively suppress the reduction of the inscribed circle diameter F of the ball 3 when the inner ring 2 is separated and the ball 3 is moved inward in the radial direction. It has become.

Here, as in the comparative example shown in FIG. 11, when the outer peripheral surface 11 of the inner ring counter bore portion 9 is a cylindrical surface having a constant outer diameter along the axial direction, the outer ring assembly is attached to the outer periphery of the inner ring 2. When the inner ring 2 is relatively inserted into the outer ring assembly, the outer corner portion of the inner ring counter bore portion 9 in the axial direction may come into contact with the ball 3, and the ball 3 may not smoothly move outward in the radial direction. .. In particular, this tendency is high when the outer diameter H of the outer peripheral surface 11 of the inner ring counter bore portion 9 is large.

On the other hand, in the angular contact ball bearing A of this embodiment, as shown in FIG. 6, the outer peripheral surface 11 of the inner ring counter bore portion 9 has a tapered shape in which the outer diameter gradually decreases as the distance from the inner ring raceway groove 8 increases. Therefore, as shown in FIG. 9, when the outer ring assembly A'is attached to the outer circumference of the inner ring 2 (relatively, the inner ring 2 is inserted into the outer ring assembly A'), the outer peripheral surface 11 of the inner ring counter bore portion 9 The ball 3 is pushed outward in the radial direction by the taper of. Therefore, the outer ring assembly A'can be mounted on the inner ring 2 particularly smoothly, and even when the first and second angular contact ball bearings A and B are assembled in a short cycle time, the surface of the ball 3 is formed. Is not easily scratched.

Further, as shown in FIG. 9, in the angular contact ball bearing A, the outer diameter H of the portion of the outer peripheral surface 11 of the inner ring counter bore portion 9 farthest from the inner ring raceway groove 8 separates the inner ring 2 to form the ball 3 diameter. Since the ball 3 is moved inward in the direction and is set smaller than the inscribed circle diameter F of the ball 3 when the ball 3 is received by the pair of convex edge portions 33 and the counter-counter side annular portion 13, the outer circumference of the inner ring 2 is set to be smaller. When the outer ring assembly A'is attached to the outer ring assembly A', the ball 3 can be reliably pushed outward in the radial direction by the tapered outer peripheral surface 11 of the inner ring counter bore portion 9. Therefore, the work of attaching the outer ring assembly A'to the inner ring 2 becomes extremely smooth, and it is possible to reliably prevent the surface of the ball 3 from being scratched.

Further, in this angular contact ball bearing A, since the counter-side annular portion 12, the counter-side annular portion 13 and the pillar portion 14 are formed of resin, the cage 4 can be manufactured at low cost.

As shown in FIG. 13, the inner ring separated type angular contact ball bearing A can be used as a bearing for an automobile transmission. This transmission is a stepless transmission capable of shifting and outputting the rotation of an automobile engine and changing the gear ratio steplessly.

The transmission includes a torque converter 51 connected to the crankshaft 50 of the automobile engine, an input shaft 52 into which the rotation of the automobile engine is input via the torque converter 51, and an output shaft 53 provided in parallel with the input shaft 52. , The drive side V-groove pulley 54 provided on the outer periphery of the input shaft 52 so as to rotate integrally with the input shaft 52, and the driven side V provided on the outer periphery of the output shaft 53 so as to rotate integrally with the output shaft 53. It has a groove pulley 55 and a V-belt 56 wound between the drive-side V-groove pulley 54 and the driven-side V-groove pulley 55.

The drive-side V-groove pulley 54 is driven by a drive-side fixed sheave 57 fixedly provided on the outer circumference of the input shaft 52, a drive-side movable sheave 58 provided on the outer circumference of the input shaft 52 so as to be movable in the axial direction, and a drive-side movable sheave 58. It has a drive side sheave actuator 59 that moves the side movable sheave 58 in the axial direction. The drive-side sheave actuator 59 changes the distance between the drive-side fixed sheave 57 and the drive-side movable sheave 58 by moving the drive-side movable sheave 58 in the axial direction, whereby the V-belt 56 with respect to the drive-side V-groove pulley 54. It is possible to change the winding radius of.

The driven side V-groove pulley 55 is driven by a driven side fixed sheave 60 fixedly provided on the outer circumference of the output shaft 53, a driven side movable sheave 61 provided on the outer circumference of the output shaft 53 so as to be movable in the axial direction, and a driven side movable sheave 61. It has a driven side sheave actuator 62 that moves the side movable sheave 61 in the axial direction. The driven side sheave actuator 62 changes the distance between the driven side fixed sheave 60 and the driven side movable sheave 61 by moving the driven side movable sheave 61 in the axial direction, whereby the V belt 56 with respect to the driven side V groove pulley 55. It is possible to change the winding radius of.

An output gear 64 that outputs rotation to the differential mechanism 63 is fixedly provided on the output shaft 53. The differential mechanism 63 is a differential gear device that distributes the rotation transmitted from the output gear 64 to the pair of left and right drive shafts 65.

The bearing that rotatably supports the input shaft 52 is an angular contact ball bearing A. Here, the angular contact ball bearing A not only receives a radial load from the input shaft 52, but also receives an axial load which is an axial component of the force acting on the drive side fixed sheave 57 and the drive side movable sheave 58 from the V belt 56. is recieving.

The bearing that rotatably supports the output shaft 53 is an angular contact ball bearing A. Here, the angular contact ball bearing A not only receives a radial load from the output shaft 53, but also receives an axial load which is an axial component of the force acting on the driven side fixed sheave 60 and the driven side movable sheave 61 from the V belt 56. is recieving.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Outer ring 2 Inner ring 3 Ball 4 Cage 8 Inner ring raceway groove 9 Inner ring Counter bore part 10 Inner ring shoulder part 12 Counter side annular part 13 Counter side annular part 14 Pillar part 15 Pocket 25 Straight surface 26 Tapered surface 33 Convex edge part D ball Diameter H Outer diameter P Pitch circle T Radial thickness W Axial spacing g Axial distance

Claims (9)

Outer ring (1) and
An inner ring (2) coaxially arranged inside the outer ring (1) in the radial direction,
A plurality of balls (3) incorporated between the outer ring (1) and the inner ring (2) at intervals in the circumferential direction, and
A cage (4) for holding the plurality of balls (3) is provided.
On the outer circumference of the inner ring (2), an inner ring raceway groove (8) to which the ball (3) rolls and contacts, and an inner ring counter bore portion (9) adjacent to one side in the axial direction of the inner ring raceway groove (8). And an inner ring shoulder portion (10) adjacent to the other side in the axial direction of the inner ring raceway groove (8) and having an outer diameter larger than that of the inner ring counter bore portion (9).
The cage (4) extends in the circumferential direction on one side in the axial direction with respect to the ball (3), and has an inner diameter smaller than the outer diameter of the inner ring shoulder portion (10). ), The counter side annular portion (13) extending in the circumferential direction on the other side in the axial direction with respect to the ball (3) and having an inner diameter larger than the outer diameter of the inner ring shoulder portion (10). It has a plurality of pillar portions (14) that pass between the plurality of balls (3) and connect the counter-side annular portion (12) and the counter-counter-side annular portion (13).
A pocket (15) for accommodating the ball (3) is partitioned between the counter-side annular portion (12), the counter-counter-side annular portion (13), and the pillar portion (14).
The pocket (15) is an inner ring separated type angular contact ball bearing having a shape in which the ball (3) does not fall out radially inward from the pocket (15) when the inner ring (2) is separated.
A straight surface (25) and a straight surface (25) in which the inner peripheral surface of the pillar portion (14) extends axially from the counter-side annular portion (12) to the side of the counter-counter-side annular portion (13). ) With a tapered surface (26) that gradually expands in diameter from the counter side annular portion (13).
The radial inner opening edge of the pocket (15) is a pair of convex edges protruding inward of the pocket (15) at the boundary position between the straight surface (25) and the tapered surface (26) when viewed in the radial direction. Form part (33)
When the inner ring (2) is separated and the ball (3) is moved inward in the radial direction, the ball (3) is formed by the pair of convex edge portions (33) and the counter-counter side annular portion (13). ) To prevent the ball (3) from falling off.
Inner ring separated type angular contact ball bearing. The inner ring (2) is separated, the ball (3) is moved inward in the radial direction, and the ball (3) is received by the pair of convex edge portions (33) and the counter-counter side annular portion (13). At that time, the axial distance (g) between the contact position of the convex edge portion (33) with respect to the ball (3) and the center position of the ball (3) is the diameter (D) of the ball (3). The inner ring separation type angular contact ball bearing according to claim 1, wherein the convex edge portion (33) is arranged so as to be contained in 10% or less of the above. The pillar portion (14) has a pitch circle (P) that commonly passes through the center of the balls (3) in a state where the balls (3) are incorporated between the outer ring (1) and the inner ring (2). 1 is formed so that the radial thickness (T) from the position of the ball (25) to the straight surface (25) is in the range of 30% or more and 50% or less of the diameter (D) of the ball (3). Alternatively, the inner ring separated type angular contact ball bearing according to 2. The inner ring-separated angular ball according to any one of claims 1 to 3, wherein the axial distance (W) of the pair of convex edge portions (33) is 65% or less of the diameter (D) of the ball (3). bearing. The radial inner opening edge of the pocket (15) is a semicircular first edge (31) that opens toward the counter-counter annular portion (13) when viewed in the radial direction, and the semicircle. Connected to both ends of the first edge portion (31) so that the convex edge portions (33) are formed at both ends of the first edge portion (31), and toward the counter-counter side annular portion (13). The inner ring separated type angular contact ball bearing according to any one of claims 1 to 4, which has a pair of opposed second edge portions (32) having a widening width. The method according to any one of claims 1 to 5, wherein the outer peripheral surface (11) of the inner ring counter bore portion (9) is formed in a tapered shape in which the outer diameter gradually decreases as the distance from the inner ring raceway groove (8) increases. Inner ring separated type angular contact ball bearing. The outer diameter (H) of the portion of the outer peripheral surface (11) of the inner ring counter bore portion (9) farthest from the inner ring raceway groove (8) separates the inner ring (2) and causes the ball (3) to have a diameter. The inscribed circle diameter (F) of the ball (3) when the ball (3) is moved inward in the direction and received by the pair of convex edge portions (33) and the counter-counter side annular portion (13). The inner ring separated type angular contact ball bearing according to claim 6, which is set smaller than. The inner ring separated type angular contact ball bearing according to any one of claims 1 to 7, wherein the counter-side annular portion (12), the counter-counter-side annular portion (13), and the pillar portion (14) are made of resin. .. The inner ring separated type angular contact ball bearing according to any one of claims 1 to 8, which is used as a bearing for an automobile transmission.

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