JPH11210757A - Crown-shaped holder made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the amount of grease stored as large as possible in a crown- shaped holder made of a synthetic resin and to smoothly supply the grease to parts which need lubrication. SOLUTION: In a crown-shaped holder 4 made of a synthetic resin, ball- holding claws 8 which overhang toward openings in circumferentially adjacent pockets 6 are provided on both of the circumferential sides of the free end of each partitioning projecting piece 7 present between the adjacent pockets 6, and at least one of the partitioning projecting pieces 7 is provided with a grease storage part axially extending over a line connecting the centers of the pockets 6 circumferentially. Therefore, grease flowing out of the grease storage part as the holder 4 rotates is allowed to easily move toward the centers or the pockets 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin crown retainer used for a ball bearing.

[0002]

2. Description of the Related Art A conventional crown retainer of this type will be described with reference to FIGS. That is, the crown cage 14
Is obtained by molding a synthetic resin material.
5, pockets 16 for fitting and holding the balls 13 are formed in several places substantially equally distributed around the circumference and open to one end in the axial direction.

[0003] In the annular base body 15, a ball holding claw 18 protruding toward the opening side of the pocket 16 is provided at the tip of a partitioning protruding piece 17 existing between adjacent pockets 16 in the circumferential direction. Is provided. This ball holding claw 18
Is designed such that when the ball 13 is incorporated into the pocket 16 from the axial direction, the ball 13 can be elastically deformed to facilitate insertion and removal of the ball 13.

[0004] As described above, by providing the ball holding claws 18 on both sides in the circumferential direction on the free end side of each partitioning projection 17, a concave portion 19 is formed therebetween. The concave portion 19 is used as a grease storing portion to supply grease to the pocket 16. The grease supplied to the pocket 16 is the ball 1
3 to be transferred to the races of the inner ring 11 and the outer ring 12.

[0005]

However, in the above-mentioned conventional crown-shaped cage, the concave portion 19 formed on the free end side of each partitioning projection 17 is merely provided with the ball holding claw 18. Since it is a by-product, the depth of the concave portion 19 depends on the axial projection of the ball holding claw 18.

Here, the axial projection of the ball holding claw 18 is usually determined in consideration of the rigidity of the partitioning projection 17, and therefore cannot be made too long. Therefore, it can be said that the depth of the concave portion 19 cannot be made too large, and the grease supply to the pocket 16 side may be insufficient, such that the amount of stored grease must be relatively small. Was. In particular, it can be said that the tendency becomes more remarkable when used at high speed rotation.

Further, since the recess 19 is provided at a position that does not reach the line C connecting the centers of the pockets 16 in the circumferential direction, the grease flowing out of the recess 19 with the rotation is directed toward the opening of the pocket 16. As a result, the ball 13 is attached to one side in the axial direction of the ball 13 accommodated in the pocket 16. In a situation where the ball bearing is used as shown in FIG. Grease tends to be difficult to supply.

Accordingly, an object of the present invention is to provide a synthetic resin crown-shaped cage in which the amount of stored grease is increased as much as possible and the supply of grease to a portion requiring lubrication can be performed satisfactorily.

[0009]

According to a first aspect of the present invention, there is provided a synthetic resin crown-shaped cage in which a ball accommodating pocket is opened at one end in the axial direction at several locations around the circumference of an annular base. A ball holding claw projecting toward the opening of the pocket is provided on both sides in the circumferential direction on the free end side of the partitioning protrusion present between the pockets adjacent in the circumferential direction; At least one of the pieces is provided with a grease storing portion so as to straddle a line connecting the center of each pocket in the circumferential direction in the axial direction.

According to a second aspect of the present invention, there is provided a synthetic resin crown-shaped retainer, wherein the grease storing section according to the first aspect is configured such that the grease storage section is a partitioning projection.
The recesses formed between the two ball holding claws are formed so as to be depressed deeply in the axial direction toward the base side of the partitioning projection.

According to a third aspect of the present invention, there is provided a crown retainer made of synthetic resin, wherein the grease storing portion of the first aspect is formed so as to be depressed radially on at least one side of the inner and outer peripheral surfaces of the partitioning projection. is there.

As described above, in the crown-shaped retainer of the present invention, grease is stored in the recess existing between the ball holding claws formed on the free end side of each partitioning projection. Since the grease reservoir is more positively provided on at least one of the partitioning projections, the amount of grease held increases.

In particular, since the above-mentioned grease storing portion is provided so as to straddle the line connecting the center of the pocket in the circumferential direction in the axial direction, the grease existing in the grease storing portion during rotation is moved toward the center of the pocket. It is easy to be leaked toward. Therefore, when this crown type cage is used in a state where it is incorporated in a ball bearing, grease flowing out of the grease reservoir is easily supplied directly to the raceway portion where the balls roll on the raceway ring. The grease flowing out of the recess existing between the ball holding claws flows toward the opening of the pocket, and thus adheres to one axial side of the ball accommodated in the pocket, and the inner and outer rings It can be said that it is difficult to be supplied to the contact portion between the ball and the ball. However, the total amount of grease supplied to the pockets is increased by the grease flowing out of the grease reservoir and the grease flowing out of the recess, so that the lubrication conditions are good.

According to the second aspect of the present invention, since the grease storing portion is connected to the concave portion and has a large space, a large amount of grease can be stored.

According to the third aspect of the present invention, since the grease storing portion does not penetrate the partitioning protrusion in the radial direction, the rigidity of the partitioning protrusion having the grease storing portion hardly decreases. When the grease reservoir is formed on the outer peripheral surface side of the partitioning projection, the grease easily flows out or scatters due to the rotational centrifugal force. In addition, when the grease is formed on the inner peripheral surface side, surplus grease is easily collected in the grease storage portion, and when the grease overflows due to the collection, the grease flows out to the pocket side.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in FIGS.

FIGS. 1 to 4 relate to the first embodiment of the present invention. FIG. 1 is a perspective view of the crown-shaped cage of the first embodiment of the present invention, and FIG. FIG. 3 is a developed view showing a part, FIG. 3 is a perspective view showing a ball bearing using a crown type retainer, and FIG. 4 is a sectional view of each part of the ball bearing shown in FIG.

In FIGS. 3 and 4, A indicates the whole of the deep groove ball bearing, and this deep groove ball bearing A has a large number of balls 3 interposed between the inner ring 1 and the outer ring 2 as is well known. The plurality of balls 3 are arranged and held by the crown-shaped retainer 4 so that the circumferential distance between the groups of balls 3 is kept constant.

As shown in FIGS. 1 and 2, the crown-shaped retainer 4 is obtained by molding a synthetic resin material. Pocket 6 is formed so as to open to one end in the axial direction. A ball holding claw 8 that projects toward the opening of the pocket 6 is formed at the tip of the partitioning protrusion 7 remaining between the adjacent pockets 6. By providing the ball holding claws 8 on both sides in the circumferential direction on the free end side of each partitioning projection 7 in this way, a recess 9 is formed between them. This recess 9
Is a portion where grease is applied or a lubricant enters during use, and is stored.

Then, of the plurality of recesses 9 provided in the crown-shaped cage 4, for example, a total of 4
Each of the recesses 9A is deeply depressed in the axial direction, and is set so that the storage amount of the lubricant is increased as much as possible. Particularly, in the first embodiment, the axial depth of the recess 9A is set so as to straddle the line C connecting the center points of the pockets 6 in the circumferential direction in the axial direction. This is because when the grease stored in the concave portion 9A flows out or scatters in the radial direction with the rotation of the bearing, it is easily supplied directly to the center of the pocket 6. The number of recesses 9A having a large cutting depth is arbitrary, but at least one
It is good if it is individual. However, when the number is increased to two or more, it is preferable that the number is provided so as to be evenly distributed in the circumferential direction as much as possible in order to manage the rotational balance with high accuracy.

It should be noted that the present invention is not limited to only the above-described embodiment, and various applications can be considered.

(1) In the first embodiment, one of the recesses 9 (indicated by reference numeral 9A) provided in the partitioning projection 7 of the crown-shaped cage 4 is set to have a large axial depression depth. Although the grease storage amount is increased, a grease storage unit 10 can be provided separately from the recess 9 as shown in FIGS.

In the second embodiment shown in FIGS. 5 to 7, grease storage portions 10 which are depressed in the radial direction are provided on the inner and outer peripheral surfaces of several portions of each partitioning projection 7, and the grease storage portions 10 are provided.
Each is formed so as to be continuous with the concave portion 9 provided on the tip end side of the partitioning projection 7. In this case, the rigidity of the partitioning projection 7 does not need to be significantly reduced.

In the third embodiment shown in FIG. 8, the grease storage portion 10 shown in FIG. 5 is extended so as to reach from the concave portion 9 to the end of the annular base member 5, so that the grease storage amount can be reduced as much as possible. Let me do more.

In the fourth embodiment shown in FIG. 9, the grease reservoir 10 shown in FIG. 8 is made independent without being connected to the recess 9. In this case, the grease storage amount can be increased as much as possible while securing the rigidity of the partitioning projection 7 sufficiently.

The grease reservoir 10 may be formed on at least one of the inner peripheral surface and the outer peripheral surface of the partitioning projection 7. However, if it is formed on the outer peripheral surface,
The outflow or scattering of the grease due to the rotational centrifugal force is effectively performed. Further, if the grease is formed on the inner peripheral surface, surplus grease is easily collected in the grease reservoir 10, and when the grease overflows due to the collection, the grease flows out to the pocket 6 side.

[0027]

According to the first to third aspects of the present invention, the retainer can hold a large amount of grease.
Lubricity inside the pocket can be improved. In addition,
Good lubrication performance can be exhibited even when used at high speeds or high loads. Further, in a situation where the crown type cage of the present invention is used by being incorporated into a ball bearing,
Grease can be satisfactorily supplied also to the contact portion between the outer ring and the ball, which contributes to the improvement of the bearing life.

In addition, since the grease reservoir is formed in a part of the partitioning projections, the rigidity of the partitioning projections does not decrease and the durability can be maintained.

In particular, according to the second aspect of the present invention, since the grease storage portion is connected to the concave portion to increase the volume as much as possible, a large amount of grease can be stored, and high lubrication performance can be exhibited.

According to the third aspect of the present invention, since the grease reservoir does not penetrate the partitioning projection in the radial direction,
The rigidity of the partitioning protruding piece formed with the grease reservoir is less likely to decrease, and the lubrication and durability can be achieved. When the grease reservoir is formed on the outer peripheral surface side of the partitioning projection, the grease easily flows out or scatters due to the rotational centrifugal force. In addition, when the grease is formed on the inner peripheral surface side, surplus grease is easily collected in the grease storage portion, and when the grease overflows due to the collection, the grease flows out to the pocket side.

As described above, according to the present invention, it is possible to provide an excellent synthetic resin crown-shaped retainer that can increase the amount of stored grease as much as possible and can supply the grease to a portion requiring lubrication satisfactorily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a crown type cage according to a first embodiment of the present invention.

FIG. 2 is an exploded view showing a part of the crown type cage according to the first embodiment.

FIG. 3 is a partially cutaway perspective view showing a ball bearing using the crowned cage of the first embodiment.

FIG. 4 is a sectional view of each part of the ball bearing of FIG. 3;

FIG. 5 is a developed view showing a part of the crown type cage according to the second embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of the crown-shaped retainer according to the second embodiment.

FIG. 7 is a cross-sectional view showing a main part of a ball bearing using the crowned cage according to the second embodiment.

FIG. 8 is a perspective view showing a main part of a crown type cage according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing a main part of the crown-shaped cage of the third embodiment.

FIG. 10 is a developed view showing a part of a conventional resin crown retainer.

FIG. 11 is a cross-sectional view showing a main part of a ball bearing using a conventional resin crown retainer.

[Explanation of symbols]

 Reference Signs List 5 annular base 6 pocket 7 partitioning projection 8 ball holding claw 9 concave 9A concave with large depression

Claims (3)

[Claims] Claims 1. A synthetic resin crown-shaped retainer formed by opening pockets for containing balls at several locations around the circumference of an annular base body at one axial end, between pockets adjacent in the circumferential direction. Ball retaining claws projecting toward the opening side of the pocket are provided on both sides in the circumferential direction on the free end side of the existing partitioning projection, and at least one of the partitioning projections has the center of each pocket. A synthetic resin crown retainer, wherein a grease reservoir is provided so as to straddle a line connecting in a circumferential direction in an axial direction. 2. The synthetic resin crown retainer according to claim 1, wherein the grease reservoir is provided with a recess formed between two ball holding claws of the partitioning projection piece. A crown holder made of synthetic resin, which is formed so as to be deeply depressed in the axial direction toward the base side of the piece. 3. The synthetic resin crown retainer according to claim 1, wherein the grease reservoir is formed so as to be depressed radially on at least one side of the inner and outer peripheral surfaces of the partitioning projection. Features a synthetic resin crown cage.