JP2543929Y2 - Press cage for ball bearings - Google Patents

Description

[Detailed description of the invention]

[0001]

The ball bearing press retainer according to the present invention is used for holding a plurality of balls constituting a ball bearing at equal intervals and rolling freely.

[0002]

2. Description of the Related Art As described in, for example, "NSK Rolling Bearings" which is a catalog of rolling bearings issued by the applicant company, ball bearings as shown in FIG. 6 are widely known. As shown in FIGS. 6 and 7, the rolling bearing includes a plurality of balls 5, between an outer raceway 2 formed on the inner peripheral surface of the outer race 1 and an inner raceway 4 formed on the outer peripheral surface of the inner race 3. 5 is provided so as to be able to roll freely, so that the relative rotation between the outer race 1 and the inner race 3 can be freely adjusted. The plurality of balls 5, 5 are rollably held in pockets 7, 7 of the retainer 6, respectively, to prevent the adjacent balls 5, 5 from coming into contact with each other.

[0003] The retainer 6 is formed by press-forming a thin metal plate such as a low-carbon steel plate or a stainless steel plate, as shown in FIGS.
As shown in FIG. 1, a main body having an annular shape as a whole and having a substantially cylindrical peripheral wall 8 and a bent portion 9 for reinforcement formed by bending one edge in the width direction of the peripheral wall 8 inward. 1
0, a plurality of pockets 7, 7 over the entire circumference of the peripheral wall 8.
Are formed at an interval from each other.

The inner diameter r of each of the pockets 7, which are circular through holes, is smaller than the outer diameter d of the ball 5 to be held (r <
d) Then, the ball 5 cannot pass through the inside of each pocket 7, 7. Further, on the inner peripheral surface side of the peripheral wall 8, mortar-shaped surface pushing portions 12, 12 are formed in the openings of the pockets 7, 7 as shown in FIGS. 9 to 11. Each pocket 7,
Part of the outer surface of the ball 5 that is held so as to be able to roll inside the
It comes into contact with the surface pressing portions 12 and 12. For this reason, the sharp edge of the metal does not slide on the outer surface of the ball 5, so that the abrasion of the edge portion can be prevented and the outer surface of the ball 5 can be prevented from being damaged.

The operation of forming the pockets 7, 7 and the surface pressing portions 12, 12 on the peripheral wall 8 of the main body 10 is described with reference to FIGS.
As shown in FIG. This punch 13
A small-diameter portion 14 having an outer diameter that matches the inner diameter r of the pockets 7, and a large-diameter portion 15 concentric with the small-diameter portion 14.
And a slanted portion 16 having a conical surface shape or a spherical shape substantially coinciding with the outer surface of the ball 5, and connecting the small-diameter portion 14 and the large-diameter portion 15 to each other. 8 can be moved freely.

When the punch 13 as described above is strongly pressed against the peripheral wall 8 from the inner peripheral surface side, a pocket 7 having a circular hole with an inner diameter r is formed first, and then the inner peripheral surface side of the pocket 7 is formed. The inclined portion 16 is abutted against the opening, and the mortar-shaped surface pressing portion 12 is formed in the opening.

[0007]

However, the conventional ball bearing press retainer manufactured as described above has the following problems to be solved.

That is, after the pocket 7 is punched out of the peripheral wall 8, the inclined portion 16 of the punch 13 is formed on the inner peripheral surface of the peripheral wall 8 so as to form the face pressing portion 12 at the opening of the pocket 7. When the peripheral portion is strongly pressed, a component force is generated that pushes the peripheral portion outward in the radial direction. Then, on the basis of this component force, the pillar portion 17 partitioning the adjacent pockets 7 is pushed toward the formed pocket 7 as shown by an arrow α in FIG.

If the width w of the column portion 17 in the circumferential direction of the peripheral wall 8 is sufficiently large, no particular problem occurs. However, in order to increase the load capacity of the ball bearing, the number of balls 5, 5 is increased. (See FIG. 6), when the width dimension w is reduced accordingly, the column 17 is deformed in the direction of the arrow α, and the pocket 7 is partitioned by the column 17.
Is incorrect.

The ball bearing press retainer of the present invention has been devised in order to prevent the above-mentioned disadvantages.

[0011]

The press cage for a ball bearing of the present invention is formed in a ring shape by press-forming a thin metal plate in the same manner as the above-described conventional ball bearing press retainer. A main body having a substantially cylindrical or bowl-shaped peripheral wall, a pocket formed over the entire periphery of the peripheral wall, spaced apart from each other, and through which a ball to be held cannot pass, and an inner peripheral surface side of the peripheral wall, And a surface pressing portion formed at the opening of each pocket.

Further, in the ball cage press retainer of the present invention, each of the pockets has a non-circular shape in which a circumferential dimension of the peripheral wall is larger than a width dimension thereof, and the pocket has a non-circular shape. It is characterized in that the pressing portions are formed at both widthwise edges of each pocket.

[0013]

In the case of the ball bearing press retainer of the present invention configured as described above, the surface pressing portions are formed at both widthwise edges of each pocket and are not formed at both circumferential edges. With the formation of the face-pressed portion, the column portion that partitions the pockets adjacent in the circumferential direction does not deform.

[0014]

1 to 3 show an embodiment of the present invention. The retainer 6a, which has been formed into an annular shape as a whole by press-forming a thin metal plate such as a low carbon steel plate or a stainless steel plate, has a bowl-shaped peripheral wall 8 similar to the above-described conventional press retainer.
A main body 10 having a reinforcing bent portion 9 formed by bending one edge in the width direction (upper edge in FIG. 2) of the peripheral wall 8 inward is provided with a plurality of pockets 11 over the entire circumference of the peripheral wall 8. , 11 are formed at an interval from each other.

However, in the case of the retainer 6a of the present invention, each of the pockets 11, 11 is not circular but oval. The major axis a of the elliptical shape is arranged in the circumferential direction of the peripheral wall 8 (the horizontal direction in FIG. 3), and the minor axis b is arranged in the width direction of the peripheral wall 8 (the vertical direction in FIGS. 2 to 3). I have. Both the major diameter a and the minor diameter b are the outer diameters d of the balls 5, 5 to be held.
(A, b <d) so that the ball 5 cannot pass through the inside of each pocket 11. The pockets 11 are formed at both edges in the width direction (vertical direction in FIGS. 2 and 3), which are approximately crescent-shaped, tapered surfaces extending toward the inner diameter surface. .

As described above, the oval pocket 1 is formed on the peripheral wall 8.
1 and a punch 13a for forming the crescent-shaped surface pressing portions 18, 18 at both edges in the width direction of the pocket 11, respectively, have a shape as shown in FIG.
The cross-sectional shape of the elliptical column portion 19 at the tip has a major axis a and a minor axis b. In addition, each is continuous with the above-mentioned elliptical column portion 19 through the crescent-shaped arc-shaped inclined portions 20, 20.
The cylindrical portion 21 coaxial with the elliptical column portion 19 has a diameter a.

When the punch 13a having the above-described shape is strongly pressed against the inner peripheral surface of the peripheral wall 8 in order to manufacture the ball bearing press retainer of the present invention configured as described above,
First, the elliptical pocket 11 is punched out by the elliptical column portion 19 at the tip of the punch 13a. When the punch 13a is further strongly pressed toward the inner peripheral surface of the peripheral wall 8,
Inclined portion 2 formed between elliptical column 19 and column 21
0, 20 are pressed against both edges in the width direction of the pocket 11, and the substantially crescent-shaped surface pressing portions 18, 18, as described above.
Are formed at both widthwise edges of each pocket 11. Due to the formation of the surface pressing portions 18, the peripheral edge of the opening on the inner peripheral side of the elliptical pocket 11 is modified into a circular shape.

At the time of this surface pushing operation, the inclined portions 20, 2
0 is pressed only to both edges in the width direction of each pocket 11, and is not pressed to both edges in the circumferential direction. For this reason, the column portions 17, 17 that partition the pockets 11, which are adjacent in the circumferential direction, are not deformed by the forming operation of the surface pressing portion.

In the case of the above embodiment, the shape of the pocket 11 is elliptical, but the shape of the pocket formed in the ball bearing press retainer of the present invention is not limited to the elliptical shape, and is not limited to the elliptical shape. It is sufficient if the circumferential dimension is larger than the dimension, and other shapes such as those shown in FIGS. 5A, 5B, and 5C are conceivable.

For example, FIG. 5A shows a pocket 11 having a shape like a football, and FIGS.
Concave portions 23, 23 are formed at both ends in the circumferential direction of a circular main portion 22.

[0021]

[Effects of the Invention] Since the ball cage press retainer of the present invention is constructed and operates as described above, it does not distort the dimension and shape of the pillar portion due to the work of forming the surface pressing portion, and a large number thereof. And a highly accurate press bearing for a ball bearing.

[Brief description of the drawings]

FIG. 1 is a partial front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view of the pocket and the face pressing portion as viewed from the direction of arrow B in FIG. 2;

4A and 4B show a pocket and a punch for forming a surface pressing portion, wherein FIG. 4A is a front view, FIG. 4B is a side view, FIG. 4C is a cross-sectional view taken along line A of FIG. FIG.

FIG. 5 is a view similar to FIG. 3, showing another three examples of the shapes of the pocket and the face pressing portion.

FIG. 6 is a partially cutaway perspective view showing an example of a ball bearing incorporating a cage to which the present invention is applied.

FIG. 7 is a partial sectional view of the same.

FIG. 8 is a perspective view showing only a retainer.

FIG. 9 is a partial front view showing a conventional cage.

FIG. 10 is a sectional view taken along line CC of FIG. 9;

FIG. 11 is a view of the pocket and the surface pressing portion viewed from the direction of arrow D in FIG. 10;

FIG. 12 is a perspective view showing a state in which a conventional pocket and a surface pressing portion are formed.

FIG. 13 is a sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Outer ring raceway 3 Inner ring 4 Inner ring raceway 5 Ball 6 Cage 6a Cage 7 Pocket 8 Peripheral wall 9 Folding part 10 Main body 11 Pocket 12 Facing part 13 Punch 13a Punch 14 Small diameter part 15 Large diameter part 16 Inclined part 17 Column part 18 face pressing part 19 elliptical column part 20 inclined part 21 column part 22 main part 23 concave part

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal thin plate is formed into an annular shape by press molding, and a main body having a substantially cylindrical or bowl-shaped peripheral wall and a main body having a peripheral wall formed around the entire peripheral wall are spaced from each other. In a ball bearing press retainer having a pocket through which a ball to be held cannot pass, and a surface pressing portion formed in an opening of each pocket on the inner peripheral surface side of the peripheral wall, A dimension of the peripheral wall in the circumferential direction is larger than a dimension of the peripheral wall in the width direction.
A ball bearing press retainer, characterized in that the surface pushing portions are formed at both widthwise edges of each pocket.