JP2003287032A - Plastic crown cage for ball bearings - Google Patents

Abstract

[PROBLEMS] To provide a plastic crown-type cage for ball bearings capable of significantly extending the life of a bearing by preventing grease leakage from the non-pocket side to the outside of the bearing. A plastic crown-type cage 10 for ball bearings according to the present invention has a pocket 1 in which one side is opened on the circumference of one side surface of an annular body 11 and a plurality of balls 60 are rotatably held on the inner surface.
2 is provided. Further, a recess 15 having an opening on the inner peripheral surface side of the annular body 11 on the side opposite to the pocket and having a hanging wall 18 is formed. The recess 15 includes a pair of side walls 16 on the circumferential side of the annular body 11 and a bottom wall 17 on the bottom thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic cage for high temperature / high speed ball bearings which require high temperature and high speed rotation. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crown type cage for ball bearings for use, particularly a plastic crown type cage for ball bearings used in deep groove ball bearings.

[0002]

2. Description of the Related Art Generally, cages include crown type cages and hollow type cages, but cages made of plastic (thermoplastic resin) are more shaped than cages made of steel. It has a large degree of freedom in design, and has the advantages of low cost, low torque (low friction and low wear), and light weight, so it tends to be widely used.

As shown in FIG. 6, in a conventional plastic crown type cage 70 for ball bearings, a pocket 72 for holding the balls 60 is circumferentially provided on one surface of an annular body 71. . Such a plastic crown type cage 70 for ball bearings does not have a grease reservoir or a grease flow passage on the side surface of the annular body 71 and the inner surface of the pocket.

As a plastic crown type cage for ball bearings, the plastic crown type cage for ball bearings disclosed in Japanese Patent Laid-Open No. 10-238543 has a cylindrical surface formed in the axial direction of the inner surface of the pocket. A grease reservoir is provided inside the pocket. Further, in the plastic crown type cage for ball bearings disclosed in Japanese Patent Laid-Open No. 10-213139, a grease passage communicating with the pocket is provided on the circumferential surface of the annular body.

[0005]

However, in the plastic crown type cage 70 for ball bearings shown in FIG. 6, the idea for improving the lubricity is not incorporated, and the bearing life is shortened. Further, inside the bearing, the space volume on the non-pocket side is smaller than that on the grease reservoir side, which is the pocket side, and there is a problem that grease leakage is likely to occur outside the bearing.

Further, the plastic crown type cage for ball bearings disclosed in the above-mentioned Japanese Patent Laid-Open No. 10-238543 has a pocket shape which does not scratch the grease adhered to the surface of the ball as shown in FIG. The bearing life can be expected to be longer than that of the bearings, but there is a problem that grease leakage easily occurs from the non-pocket side to the outside of the bearing. Further, in the plastic crown type cage for ball bearings disclosed in Japanese Patent Laid-Open No. 10-213139, by providing the grease passage, the lubricity of grease is improved as compared with that shown in FIG. Although the bearing life can be expected to be extended, there is a problem that grease leakage easily occurs from the non-pocket side to the outside of the bearing.

The present invention has been made in view of the above problems, and by preventing grease leakage from the side opposite to the pocket to the outside of the bearing, it is possible to significantly extend the life of the bearing. An object of the present invention is to provide a plastic crown type retainer.

[0008]

According to a first aspect of the present invention, in a plastic crown type cage for ball bearings, one side is opened on the circumference of one side surface of the annular body and a plurality of inner surfaces are spherical. A plastic crown-type cage for ball bearings having a pocket for rollingly holding the ball, the recess having a vertical wall is formed on at least the outer peripheral surface or the inner peripheral surface of the annular body, the recess being open to the non-pocket side. A plastic crown type cage for ball bearings characterized by the above.

According to the plastic crown type cage for ball bearings having the above-mentioned structure, the recess having the vertical wall and having the hanging wall is formed on at least the outer peripheral surface or the inner peripheral surface of the annular body. That is, the grease for lubrication between the balls and the bearing raceway is accumulated in the concave portion blocked by the hanging wall. When the bearing rotates, the plastic crown type cage for ball bearings also rotates relatively, so that the grease accumulated in the recess is circulated with the grease sealed in the bearing space. At this time, since the non-pocket side of the recess is open, the space volume inside the bearing is large, so that grease is unlikely to leak to the outside of the bearing. Therefore, the grease leakage to the outside of the bearing is eliminated, and the bearing life can be extended by maintaining the lubricity between the ball and the bearing ring.

In the plastic crown type cage for ball bearings according to claim 2 of the present invention, one side is opened on the circumference of one side surface of the annular body and the inner surface is spherical so that a plurality of balls can be rolled. In a plastic crown type cage for ball bearings having a pocket to be retained in, penetrating from the outer peripheral surface of the annular body to the inner peripheral surface,
In addition, a plastic crown type cage for ball bearings is characterized in that a recess opening to the side opposite to the pocket is formed.

According to the plastic crown type cage for ball bearings having the above-mentioned structure, since the concave portion penetrates from the outer peripheral surface of the annular body to the inner peripheral surface and is open to the side opposite to the pocket side, the ball is rotated by the rotation of the bearing. When the bearing plastic crown cage rotates relatively, the grease accumulated in the recess is circulated more efficiently with the grease filled in the bearing space. Therefore, the grease leakage to the outside of the bearing is eliminated, and the bearing life can be extended by maintaining the lubricity between the ball and the bearing ring.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a plastic crown type cage for ball bearings according to the present invention will be described below in detail with reference to FIGS. 1 to 5. FIG. 1 is a perspective view showing a plastic crown type cage 10 for ball bearings according to a first embodiment of the present invention, and FIG. 2 is an external view of a partially broken view in FIG. As shown in FIG. 1, a plastic crown-type cage (hereinafter referred to as a cage) 10 for ball bearings according to the present embodiment is molded from a plastic material which is a polymer material. This cage 10
Has a plurality of pockets 12 formed in the circumferential direction on one side surface of the annular body 11.

The pocket 12 has a spherical concave shape, and the ball 6
0 is rotatably held, is arranged at equal intervals in the circumferential direction of the annular body 11 via the column portion 13, and penetrates from the outer peripheral surface to the inner peripheral surface of the annular body 11. A pair of rising portions 14 that surround the pocket 12 are formed on one side surface of the annular body 11.

A concave portion 15 is formed at a position corresponding to the column portion 13 on the inner peripheral surface of the annular body 11. The top of the recess 15 opens toward the side opposite to the pocket of the annular body 11,
A pair of side walls 16 is provided on the circumferential side of 1, and a bottom wall 17 is provided on the bottom thereof. In addition, the concave portion 15 is the annular body 1.
1 has an opening on the inner peripheral surface side and a vertical wall 18 on the outer peripheral surface side, and is formed as an inverted trapezoidal space surrounded by the vertical wall 18, side walls 16 and 16, and a bottom wall 17.

As shown in FIG. 2, a vertical wall 18 of the recess 15 is formed.
Are arranged on the inner peripheral surface side of the column portion 13. The bottom wall 17 of the recess 15 is arranged on a bottom plate 19 which is a part of the column 13. The hanging wall 18 is orthogonal to the bottom plate 19.

When the bearing rotates, the cage 10 relatively rotates in the circumferential direction of the annular body 10 together with the balls 60 as the balls 60 rotate together with the bearing races. At that time, the grease accumulated in the concave portion 15 may not be removed from the annular body 11.
It collides with the grease on the inner circumference of the and activates the fluidity of the entire grease. Therefore, the grease is in pocket 1
It is possible to efficiently flow in 2 and lubricate the balls 60 and the bearing raceway with newer grease. At that time, since the side of the recess 15 opposite to the pocket is open, the space volume on the side opposite to the pocket inside the bearing is increased by the volume of the recess 15, and the grease does not leak to the outside of the bearing.

As described above, according to the cage 10 of the present embodiment, the balls 60 are placed in the recess 15 blocked by the hanging wall 18.
The grease for lubrication between the bearing surface and the bearing raceway is retained. Then, when the bearing rotates, the cage 10 also rotates in the bearing space, so that the grease accumulated in the recess 15 collides with the grease in the inner peripheral portion of the annular body 11 and the fluidity of the entire grease is increased. Activate. Therefore, the grease efficiently flows in the pocket 12 and the balls 6
0 and the bearing raceway can be lubricated with newer grease. At that time, since the anti-pocket side of the recess 15 is open, the space volume on the anti-pocket side inside the bearing is increased by the volume of the recess 15, and grease does not leak to the outside of the bearing. Therefore, grease does not leak from the side opposite to the pocket to the outside of the bearing, and the lubricity between the ball 60 and the bearing ring is maintained.
The bearing life can be extended.

Next, a plastic crown type cage for ball bearings according to a second embodiment of the present invention will be described in detail with reference to FIG. FIG. 3 is an external view showing a plastic crown type cage for ball bearings according to a second embodiment of the present invention. In the embodiments described below, members having the same configurations and operations as those already described are given the same or corresponding reference numerals in the drawings to simplify or omit the description.

As shown in FIG. 3, the plastic crown type cage 20 for ball bearings of this embodiment corresponds to the position of the column portion 23 arranged between the pockets 22 on the outer peripheral surface of the annular body 21. A recess 25 is formed. The top of the recess 25 is open to the side opposite to the pocket of the ring-shaped body 21, and a pair of side walls 26 is provided on the side of the ring-shaped body 21 in the circumferential direction. Further, the recess 25 has a bottom wall 27 at the bottom thereof, the outer peripheral side of the annular body 21 is open, and the vertical wall 28 is provided at the inner peripheral side. Further, the recess 25 is formed as an inverted trapezoidal space surrounded by the vertical wall 28, the side walls 26, 26, and the bottom wall 27.

In the retainer 20, when the bearing rotates, the balls 60 rotate together with the bearing races in the circumferential direction of the annular body 21 together with the balls 60 in association with this rotation. then,
The grease accumulated in the recess 25 collides with the grease on the outer peripheral portion of the annular body 21 and activates the fluidity of the entire grease. Therefore, the grease can efficiently flow in the pocket 22, and the balls 60 and the bearing raceway can be lubricated with new grease. Since the recess 25 is open on the side opposite to the pocket, the space volume on the side opposite to the pocket inside the bearing is increased by the volume of the recess 25, and the grease does not leak to the outside of the bearing.

As described above, according to the cage 20 of the present embodiment, the balls 60 are provided in the recess 25 blocked by the vertical wall 28.
The grease for lubrication between the bearing and the bearing raceway is accumulated, and when the bearing rotates, the cage 20 also rotates in the bearing space. As a result, the grease accumulated in the recess 25 collides with the grease on the outer peripheral portion of the annular body 21 and activates the fluidity of the entire grease. Therefore, the grease can efficiently flow in the pocket 22, and the balls 60 and the bearing raceway can be lubricated with new grease. At that time, since the non-pocket side of the recess 25 is open, the space volume on the non-pocket side inside the bearing is increased by the volume of the recess 25, and the grease does not leak to the outside of the bearing. Therefore, the grease does not leak from the side opposite the pocket to the outside of the bearing, and the balls 6
Since the lubricity between 0 and the bearing ring is maintained, the bearing life can be extended.

Next, a plastic crown type cage for ball bearings according to a third embodiment of the present invention will be described in detail with reference to FIG. FIG. 4 is an external view showing a plastic crown type cage for ball bearings according to a third embodiment of the present invention. As shown in FIG. 4, the plastic crown type cage 3 for ball bearings of the present embodiment
In No. 0, a concave portion 35 that penetrates from the outer peripheral surface of the annular body 31 to the inner peripheral surface and is open to the side opposite to the pocket is formed. The recess 35 is provided with a pair of side walls 36, the tops of which open toward the non-pocket side of the annular body 31 and which have curved surfaces along the pocket shape on the circumferential side portions of the annular body 31. Further, the recess 35 has a bottom wall 37 at the bottom thereof, and the bottom wall 37 constitutes a part of the pillar portion 33 arranged between the pockets 32.

When the bearing rotates, the cage 30 relatively rotates together with the balls 60 in the circumferential direction of the annular body 31 as the balls 60 rotate together with the bearing races. At that time, the grease accumulated in the recessed portion 35 is not removed from the annular body 31.
It collides with the grease on the outer peripheral portion and the inner peripheral portion and activates the fluidity of the entire grease. Since the grease on the outer peripheral portion and the inner peripheral portion of the annular body 31 flows efficiently, the grease enclosed in the bearing constantly circulates. Furthermore,
Since the side wall 36 has the curved surface, the grease can be more efficiently circulated. Therefore, the grease flows in the pocket 32, and the balls 60 and the bearing raceway surface can be lubricated with newer grease. Since the anti-pocket side of the recess 35 is open, the space on the anti-pocket side in the bearing is open. Since the volume is increased by the volume of the recess 35, the grease does not leak to the outside of the bearing.

As described above, according to the cage 30 of the present embodiment, the grease for lubrication between the balls 60 and the bearing raceway is accumulated in the recess 35, and when the bearing rotates,
The cage 30 also rotates in the bearing space. As a result, the grease accumulated in the recess 35 collides with the grease on the outer peripheral portion and the inner peripheral portion of the annular body 31 to activate the fluidity of the entire grease. Therefore, since the grease on the outer peripheral portion and the inner peripheral portion of the annular body 31 efficiently flows, the grease enclosed in the bearing is constantly circulated, the grease flows in the pocket 32, and the balls 60 and the bearing raceway. The surfaces can be lubricated with newer grease. At that time, since the non-pocket side of the concave portion 35 is open, the space volume on the non-pocket side inside the bearing is increased by the volume of the concave portion 35, and the grease does not leak to the outside of the bearing. Therefore, grease does not leak from the non-pocket side to the outside of the bearing, and the lubricity between the ball 60 and the bearing ring is maintained, so that the bearing life can be extended.

Next, a plastic crown type cage for ball bearings according to a fourth embodiment of the present invention will be described in detail with reference to FIG. FIG. 5 is an external view showing a plastic crown type cage for ball bearings according to a fourth embodiment of the present invention. As shown in FIG. 5, the plastic crown type cage 4 for ball bearings according to the present embodiment.
Reference numeral 0 denotes a through-hole portion 45a penetrating from the outer peripheral surface to the inner peripheral surface of the annular body 41, and a communication hole portion 45b communicating with the through-hole portion 45a and opening to the side opposite to the pocket.
A recess 45 is formed in the column portion 43 as a V-shaped hole.

The through hole portion 45a is a quadrangular square hole, and penetrates from the outer peripheral portion of the pillar portion 43 arranged between the pockets 42 to the inner peripheral portion thereof. A pair of side walls 45c is formed on a side portion of the through hole portion 45a in the bearing radial direction. The communication hole portion 45b is opened in a square shape on the surface of the annular body 41 on the side opposite to the pocket, and communicates with the through hole portion 45a in the column portion 43 at right angles. A pair of side walls 45d are formed on the side of the communication hole 45b in the bearing radial direction.

When the bearing rotates, the cage 40 relatively rotates in the circumferential direction of the annular body 41 together with the balls 60 as the balls 60 rotate together with the bearing races. At that time, the grease accumulated in the through-hole portion 45a and the communication hole portion 45b of the recess 45 collides with the grease on the outer peripheral portion and the inner peripheral portion of the annular body 41 to activate the fluidity of the entire grease. Therefore, the grease in the outer peripheral portion and the inner peripheral portion of the annular body 41 flows efficiently, so that the grease enclosed in the bearing constantly circulates. As a result, the grease flows in the pocket 42, and the balls 60 and the bearing raceway can be lubricated with newer grease. Since the communication hole 45b of the recess 45 is open on the side opposite to the pocket, the space volume on the side opposite to the pocket inside the bearing is increased by the volume of the recess 45, and grease may leak to the outside of the bearing. There is no.

As described above, according to the cage 40 of this embodiment, the grease for lubrication between the balls 60 and the bearing raceway collects in the recess 45, and when the bearing rotates,
The cage 40 also rotates in the bearing space. As a result, the grease accumulated in the through-hole portion 45a and the communication hole portion 45b of the recess 45 collides with the grease on the outer peripheral portion and the inner peripheral portion of the annular body 41 to activate the fluidity of the entire grease. Therefore, since the grease on the outer peripheral portion and the inner peripheral portion of the annular body 41 efficiently flows, the grease encapsulated inside the bearing constantly circulates so that the grease flows in the pocket 42 and the balls 60 and the bearing. The raceway surface and can be lubricated with newer grease. At that time, since the communication hole portion 45b of the recess 45 is open on the side opposite to the pocket, the space volume on the side opposite to the pocket inside the bearing is increased by the volume of the recess 45, so that grease may leak to the outside of the bearing. There is no such thing. Therefore, the grease does not leak from the side opposite the pocket to the outside of the bearing, and the balls 6
Since the lubricity between 0 and the bearing ring is maintained, the bearing life can be extended.

The present invention is not limited to the above-described embodiment, but can be appropriately modified and improved.
For example, considering the ease of plastic molding and the viscosity of the grease enclosed in the bearing, the first embodiment, the second embodiment
The shape of the recess in the embodiment and the third embodiment may be arcuate. Further, the shapes of the through hole portion and the communication hole portion of the recess in the third embodiment may be round.

[0030]

As described above, according to the plastic crown-type cage for ball bearings of the first aspect of the present invention, at least the outer peripheral surface or the inner peripheral surface of the annular body is opened to the side opposite to the pocket side and is suspended. Since the recess having the wall is formed, grease leakage to the outside of the bearing is eliminated, and the lubricity of the ball and the bearing ring is maintained, whereby the life of the bearing can be significantly extended.

According to the plastic crown type cage for ball bearings of the second aspect of the present invention, the concave portion is formed so as to penetrate from the outer peripheral surface of the annular body to the inner peripheral surface and open to the side opposite to the pocket. Therefore, by eliminating grease leakage to the outside of the bearing and maintaining the lubricity between the balls and the bearing ring,
The bearing life can be greatly extended.

[Brief description of drawings]

FIG. 1 is an external view showing a first embodiment of a plastic crown-type cage for ball bearings of the present invention.

FIG. 2 is an external view of a partially cutaway view of FIG.

FIG. 3 is an external view showing a second embodiment of the plastic crown type cage for ball bearings of the present invention.

FIG. 4 is an external view showing a third embodiment of a plastic crown type cage for ball bearings of the present invention.

FIG. 5 is an external view showing a fourth embodiment of the plastic crown-type cage for ball bearings of the present invention.

FIG. 6 is an external view showing a conventional cage.

[Explanation of symbols]

10, 20, 30, 40 Ball bearing plastic cage retainers 11, 21, 31, 41 Ring body 12, 22, 32, 42 Pockets 15, 25, 35, 45 Recessed portion 18, 28 Vertical wall 60 balls

Claims (2)

[Claims] 1. A plastic crown-type cage for ball bearings, wherein one side is open on the circumference of one side of an annular body, and the inner surface is spherical and has a pocket for rotatably holding a plurality of balls. A plastic crown-type cage for ball bearings, characterized in that at least an outer peripheral surface or an inner peripheral surface of the annular body is formed with a concave portion having a vertical wall and opening toward the non-pocket side. 2. A plastic crown-type cage for ball bearings, wherein one side is open on the circumference of one side of the annular body and the inner surface is spherical and has a pocket for rotatably holding a plurality of balls. A plastic crown-type cage for ball bearings, characterized in that a recess is formed so as to penetrate from the outer peripheral surface of the annular body to the inner peripheral surface thereof and open to the opposite pocket side.