JP2000065067A - Split type cage of rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent contact with inner/outer races by arranging the inside surface continuing in a shape and a dimension in the lengthwise directional both end part side first pocket parts of a belt member and the inside surface curved in the rolling direction of a rolling member in the adjacent second pocket parts. SOLUTION: The lengthwise directional both end part side first pocket parts 21 of a belt member 11 of a cage 10 have the inner cylinder surface 23 continuing in a shape and dimension in the thickness direction of the belt member 11, and an inside diametrical dimension A is larger than a diametrical dimension B of a ball 12. The second pocket parts 22 have the recessed spherical surface 24 having an inside diametrical dimension C corresponding to the diametrical dimension B of the ball 12 and a pair of pawl parts 25 of the outer peripheral surface side opening edge part of the belt member 11, the spherical surface 24 curves in the rolling direction of the ball 12, and the dimension C gradually becomes smaller than the diametrical dimension B of the ball 12 up to the inner peripheral surface side opening edge part from the thickness directional almost central part of the belt member 11. Thus, even if a curving rate of the belt member 11 gets out of a pitch circle of the ball 12, the ball 12 slightly projects to the outer peripheral side or the inner peripheral side of the belt member 11 from the pocket part 21 to allow an error in the curving rate of the belt member 11, so that rotation of the ball 12 is not checked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type cage for a rolling bearing, and more particularly to a split type cage suitable for a large-diameter, thin-walled rolling bearing.

[0002]

2. Description of the Related Art Conventionally, large-diameter and thin-walled rolling ball bearings often use a split type cage in which a plurality of band members are arranged in an annular shape because an inner ring and an outer ring are close to each other.
FIGS. 3A and 3B show a band member 31 constituting the split type retainer 30. FIG. The band member 31 corresponds to the pitch circle of the ball 32 as a rolling member, and is curved in the thickness direction at an appropriate constant curvature so as not to contact the inner ring and the outer ring. The band member 31 is provided with a plurality of pocket portions 33 at predetermined intervals along the longitudinal direction.

[0003] As shown in FIG.
The ball 32 can be individually accommodated by penetrating the band member 31 with the same inner diameter in the thickness direction. Note that the inner diameter dimension A of the pocket portion 33 is set to be larger than the diameter dimension B of the ball 32 in advance, considering that the opening shape is slightly deformed when the band member 31 is curved. These belt members 31 are connected in a ring shape by engaging male and female connecting portions (not shown) provided at both ends in the longitudinal direction.

[0004]

Generally, in a rolling ball bearing, in order to prevent the cage from contacting the inner ring and the outer ring, or to reduce the collision sound between the ball and the inner surface of the pocket portion. 2. Description of the Related Art There is widely known a structure in which the inner surface of a pocket portion is formed as a concave spherical surface corresponding to the diameter of a ball so that the relative positions of the ball and the retainer are kept constant (conventional example). In this conventional example, the pocket portion has a substantially barrel shape in which the diameter of the opening edge is set slightly smaller than the diameter of the ball, and the ball is press-fitted.

However, when the conventional example is applied to the above-mentioned split type retainer 30, for example, when the curvature of the band member 31 deviates from a desired value, the difference between the curvature of the band member 31 and the pitch circle of each ball 32 is determined. From, pressing the opening edge of the pocket portion 32 against the ball 32,
There is a possibility that the ball 32 is restrained so as to inhibit normal rotation. In general, it is difficult to accurately bend the band member 32 to a predetermined curvature, and the curvature of the band member 32 may change over time. There was a problem that it was difficult to do.

[0006] Conventionally, the split type retainer 30 is provided with each band member.
Since the connecting portions 31 are of a structure that engages with the male and female, it is necessary to consider the orientation of each band member 31 in assembling, and there is also a problem that the assembling process is complicated. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first object of the present invention is to prevent contact between an inner ring and an outer ring, to reduce a collision sound between a rolling member and an inner surface of a pocket portion, and Another object of the present invention is to provide a split type cage for a rolling bearing which does not hinder rotation of a rolling member. A second object of the present invention is to provide a split type retainer for a rolling bearing which can simplify the assembly process.

[0007]

In order to achieve the above-mentioned first object, the present invention provides a semiconductor device comprising:
It has a plurality of band members for holding a rolling member arranged between an inner ring and an outer ring, and three or more pocket portions are provided at predetermined intervals along a longitudinal direction of the band member. A split type retainer for a rolling bearing formed in a substantially edge annular shape by bending and connecting members in a thickness direction, wherein a first pocket portion provided on both ends in a longitudinal direction of the band member has a shape and A second pocket portion adjacent to the first pocket portion has an inner surface having a continuous dimension, and has a curved inner surface along a rolling direction of the rolling member.

Here, the rolling member can be exemplified by a spherical shape, a cylindrical shape and the like, and the opening shape of the first pocket portion and the second pocket portion can be exemplified by a circular shape and a rectangular shape. Therefore, the inner surface of the first pocket portion may be formed on an inner cylindrical surface or a rectangular inner wall surface, and the inner surface of the second pocket portion may be formed on a concave spherical surface or an arc surface.

In the split type cage of the rolling bearing thus constituted, the inner surface of the first pocket portion is an inner cylindrical surface or a rectangular inner wall surface, and the inner surface of the second pocket portion is a concave spherical surface or an arc surface. Therefore, even if the curvature of the band member deviates from a desired value, for example, the rolling member slightly protrudes from the first pocket portion to the outer peripheral side or the inner peripheral side of the band member, thereby allowing the curvature ratio error of the band member. Will do. Therefore, in the split type cage of the rolling bearing, unlike the case where the inner surfaces of all the pocket portions are formed as concave spherical surfaces or arcuate surfaces, it is possible to avoid the problem of hindering the rotation of the rolling member.

[0010] On the other hand, in order to achieve the above-mentioned second object, according to the present invention, a plurality of band members for holding a rolling member disposed between an inner ring and an outer ring are provided. Pocket portions are provided at predetermined intervals along the longitudinal direction of the band member, and the band members are curved in the thickness direction, and are connected via connecting portions provided at both ends in the longitudinal direction. A divided type cage of a rolling bearing formed in a substantially annular shape by doing, wherein each of the connecting portions has a substantially planar hook shape extending along a curved extension surface from a longitudinal end surface of the band member, It is characterized in that it has a point-symmetrical shape centered on a line along the thickness direction of the band member.

Here, each connecting portion may be formed in a substantially L-shaped plane, a substantially J-shaped plane, a substantially F-shaped plane or the like which can be engaged with each other. In the split type cage of the rolling bearing configured as described above, since each connecting portion having a substantially hook shape in a plane has a point symmetric shape centered on a line along the thickness direction of the member, a plurality of band members are formed. When connecting in a ring shape, it is possible to eliminate the need to consider the orientation of each band member, thereby simplifying the assembly process as compared with the related art.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 and FIG. 2 show a band member 11 of a split type retainer 10 configured according to the present invention. As shown in FIGS. 1A and 1B, the band member 11 has a predetermined thickness, and a first pocket portion 21 and a second pocket portion 22 are provided at predetermined intervals along a longitudinal direction thereof. At the same time, it is curved in the thickness direction at a curvature corresponding to the pitch circle of the ball 12 as a rolling member. FIG.
As shown in (C), the first pocket portions 21 provided at both ends in the longitudinal direction of the band member 11 have an inner cylindrical surface 23 whose shape and dimensions are continuous along the thickness direction of the band member 11. The inner diameter A of the ball 12 is set to be larger than the diameter B of the ball 12.

On the other hand, as shown in FIGS. 1D and 1E, the second pocket portion 22 has a concave spherical surface 24 having an inner diameter C corresponding to the diameter B of the ball 12, and a band member. A pair of claw portions 2 provided on the outer peripheral side opening edge (upper side in the figure) of 11
5 and 25 are provided. The spherical surface 24 is curved along the rolling direction of the ball 12, and the inner diameter of the ball 12 gradually increases from the substantially central portion in the thickness direction of the band member 11 to the inner peripheral surface side opening edge (lower in the figure). Is formed so as to be smaller than the diameter dimension B.

As shown in FIG. 2, the claw portions 25, 25 are opposed to each other along the width direction of the band member 11 by cutting or injection molding a concave portion 26 on the outer peripheral surface of the band member 11. I have. The concave portion 26 has a width smaller than the diameter B of the ball 12 and is formed so as to cross the outer peripheral opening edge of the second pocket portion 22. The width dimension E of the claw portions 25 is set to be approximately 40% of the diameter dimension B of the ball 12,
The inner surface is continuous with the spherical surface 24. Therefore, the opening edge on the outer peripheral surface side of the second pocket portion 22 has a substantially elliptical shape whose major axis extends along the width direction of the band member 11 and whose minor axis extends along the longitudinal direction of the band member 11.

Returning to FIGS. 1A and 1B, such a band member 11 is connected in an annular shape through connecting portions 13 provided at both ends in the longitudinal direction. Connection
13 is a projection 14 extending from the longitudinal end surface of the band member 11 along the curved extension surface, and the band member 11 connected to the projection 14.
And an engaging portion 15 extending along the width direction of the second member. In these connecting portions 13, the projecting dimension L1 of the projecting portion 14 is set larger than the width dimension L2 of the engaging portion 15. These connecting portions 13 have a point-symmetrical shape centered on a line along the thickness direction of the band member 11, and can be connected to the connecting portions 13 of other adjacent band members 11.

According to the split type retainer 10 described above, the band member
Since the inner surface of the first pocket portion 21 provided at both ends in the longitudinal direction of the inner wall 11 is an inner cylindrical surface and the inner surface of the second pocket portion 22 is a concave spherical surface, the curvature of the band member 11 is Even when the ball 12 deviates from the pitch circle, the ball 12 slightly protrudes from the first pocket portion 21 to the outer peripheral side or the inner peripheral side of the band member 11, thereby allowing a curvature error of the band member 11, and the inner surface of the first pocket portion. Also, the problem of obstructing the rotation of the ball 12 as in the case of forming a concave spherical surface can be avoided.

Further, since the second pocket portion 22 is provided with a pair of claw portions 25, 25 at the opening edge portion on the outer peripheral surface side, if the ball 12 is pressed in while deforming the claw portions 25, 25, The second
The ball 12 can be easily accommodated in the pocket portion 22. In particular, since the claw portions 25, 25 can be deformed, the second pocket portion 22 has a claw portion 25, 25 when a curvature error that affects the second pocket portion 22 occurs in the band member 11. Is deformed to cause the ball 12 to protrude toward the outer peripheral surface side of the band member 11, whereby a curvature error of the band member 11 can be allowed.

Further, according to the split type retainer 10, the connecting portions 13, 13 of the band member 11 are substantially L-shaped in plan view,
The point-symmetrical shape centered on the line along the thickness direction of the band member 11 eliminates the need to consider the conventional orientation of the band member 11 when connecting a plurality of band members 11 in an annular shape. As a result, the assembly process can be simplified as compared with the related art. In particular, since the protrusions L1 of the projecting portions 14 are set to be larger than the width L2 of the engaging portions 15, the connecting portions 13, 13 have a high degree of freedom in the circumferential direction when assembling the rolling bearing. In addition, the dimensional error of the circumferential length of the split type cage 10 can be absorbed.

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, a ball is exemplified as a rolling member. However, the present invention is also applicable to a rolling bearing employing a cylindrical roller or a tapered roller, and is also applicable to a single row or double row rolling member. It is possible.

The number of the first pocket portions and the number of the second pocket portions are arbitrary, and need not be the same as long as the first pocket portions are provided at both ends in the longitudinal direction of the band member. Further, the claw portion provided in the second pocket portion may be provided on one or both of the outer peripheral side opening edge and the inner peripheral side opening edge of the band member, but is not essential to the present invention. Therefore, it may be omitted as appropriate.

On the other hand, the connecting portion is not limited to the shape illustrated in the above-described embodiment, but may be a substantially J-shaped plane or a substantially flat plane as long as it is a point-symmetric shape centered on a line along the thickness direction of the band member. It may be formed in an F shape or the like. In addition, the rolling member, the band member, and the first member illustrated in the above-described embodiment.
Material of pocket part, inner surface, second pocket part, connecting part, etc.
The shape, size, form, number, location, etc. are arbitrary and not limited as long as the present invention can be achieved.

[0022]

As described above, according to the present invention, as described in claim 1, the inner surface of the first pocket portion is an inner cylindrical surface or a rectangular inner wall surface, and the second pocket portion has an inner surface. Since the inner surface is a concave spherical surface or a circular arc surface, even if the curvature of the band member deviates from a desired value, there is little possibility that the rotation of the rolling member is hindered. On the other hand, according to the present invention, as described in claim 2, each of the connecting portions having a substantially hook shape in a plane has a point symmetric shape centered on a line along the thickness direction of the member. In connecting in a ring shape, the necessity to consider the orientation of each band member is eliminated, and the assembling process can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan view, a side view, and an essential part enlarged cross-sectional view showing an embodiment according to the present invention.

FIG. 2 is a perspective view showing a second pocket portion.

FIG. 3 is a plan view, a side view, and an essential part enlarged cross-sectional view showing a conventional split type cage.

[Explanation of symbols]

 10 Split type cage 11 Band member 12 Ball (rolling member) 13 Connecting part 21 First pocket part 22 Second pocket part

Claims (2)

[Claims] 1. A belt member for holding a rolling member disposed between an inner ring and an outer ring has a plurality of band members, and three or more pocket portions are provided at predetermined intervals along a longitudinal direction of the band member. A split type retainer for a rolling bearing formed in a substantially annular shape by bending each of the band members in a thickness direction and connecting the first and second band members. The pocket portion has an inner surface having a continuous shape and dimensions,
A split cage for a rolling bearing, wherein a second pocket portion adjacent to the pocket portion has an inner surface curved along the rolling direction of the rolling member. 2. A plurality of band members for holding a rolling member disposed between an inner ring and an outer ring, wherein pocket portions are provided at predetermined intervals along a longitudinal direction of the band member, and A split type retainer for a rolling bearing formed in a substantially edge annular shape by bending each band member in the thickness direction and connecting the band members through connecting portions provided at both ends in the longitudinal direction, wherein each of the connecting portions Is a substantially hook-shaped plane extending from a longitudinal end surface of the band member along a curved extension surface, and has a point-symmetrical shape centered on a line along the thickness direction of the band member. Split cage for bearings.