JPH04109222U - solid lubricated ball bearings - Google Patents

Abstract

(57) [Summary] [Structure] A plurality of rolling balls 4 rolling in a raceway groove between an inner ring 2 and an outer ring 3 of a ball bearing 1 are held in a ring-shaped cage 5 made of a material with good lubricity. The outer circumferential surface of the inner ring 2 or the outer ring 3
a tapered portion 33 inclined toward the axial direction on the inner circumferential surface of the
It is provided with a discharge groove 34 that is inclined from the deepest part of the raceway groove 31 of the outer ring 3 toward the axial direction. [Effect] Since the wear powder generated inside the ball bearing is actively discharged to the outside of the bearing, bearing friction torque and its fluctuations are reduced.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a ball bearing using a solid lubricant.

0002

[Conventional technology]

Conventionally, a ball bearing 1 using a solid lubricant has been produced by coating the raceway surfaces 21 and 31 of the inner ring 2 and outer ring 3 and the balls 4 with a layered lubricant such as soft metal or MoS2, as shown in Fig. ₃ . A retainer 5 that holds the balls 4 in a rollable manner is made of a material containing a solid lubricant, and the retainer 5 is installed while being guided through a small guide gap g between the retainer 5 and the outer ring 3. When the bearing is operated, the material of the retainer 5 transfers to the balls 4 and further to the raceway grooves 21 and 31 to form a thin lubricating film to provide lubrication, or some use a combination of both.

0003

[Problem that the idea aims to solve]

By the way, when a ball bearing is operated, the inner ring, outer ring raceway grooves, and balls are exposed to lubricant. The membrane peels off. In addition, the material containing the solid lubricant in the cage that comes into contact with the balls wears out and transfers to the balls, causing In addition, lubrication is performed by transferring to the raceway groove, but the transferred excess lubricant and worn retainer After being transferred from the cage material and further from the cage, the lubricant film peels off as the bearing is operated. These peeled lubricant films are found in the guide gap between the inner diameter of the outer ring and the outer diameter of the cage, and in the cage. It is discharged in the axial direction of the bearing from the gap between the inner diameter and the outer diameter of the inner ring. However, since the above gap is small and the inner ring and cage are rotating, It is difficult for wear particles to be discharged from the bearings, and the wear particles accumulate in the raceway grooves of the inner and outer rings. If this happens, the bearing friction torque may increase or fluctuate, or the transfer of the lubricant film may be hindered. This has the drawback of increasing retainer wear and shortening bearing life. This invention aims to facilitate the discharge of bearing wear particles and maintain good bearing performance. The target is

0004

[Means to solve the problem] The present invention consists of an inner ring with raceway grooves on the outer periphery, an outer ring with raceway grooves on the inner periphery, and A plurality of balls that can roll in the raceway grooves of the inner ring and the outer ring, and balls that can roll at equal intervals along the raceway grooves. In a solid lubricated ball bearing, the ball bearing is equipped with a cage that holds the balls in a rotatable manner, Provided on the outer circumferential surface of the inner ring or the inner circumferential surface of the outer ring, and inclined toward the axial direction. and a discharge groove that slopes in the axial direction from the deepest part of the raceway groove of the outer ring. It is equipped with the following.

[0005]

[Effect]

Some of the wear particles generated inside the bearing are inclined in the axial direction on the outer diameter surface of the inner ring or the inner diameter surface of the outer ring. It is discharged in the axial direction from the tapered surface. In addition, in the deepest part of the raceway groove of the outer ring, Since the inclined exhaust groove is provided, wear particles that accumulate in the raceway groove are removed from the exhaust groove to the outside of the bearing. is discharged.

[0006]

【Example】

An embodiment of the present invention shown in the drawings will be described. FIG. 1 is a side sectional view showing an embodiment of the present invention, in which a ball bearing 1 is provided with an inner ring 2 and an outer ring 3. A layered lubricant such as soft metal or MoS ₂ is coated on the surface of a plurality of balls 4 provided between the balls 4 so that they can roll, and a solid lubricant is applied to the balls 4 at equal intervals so that they can roll. The retainer 5 is held by a retainer 5 made of a material containing the same material as the conventional example, and the retainer 5 is guided to the inner diameter surface of the outer ring 3 via a guide gap g. What is different from the conventional example is that a tapered part 33 is provided on the inner circumferential surface 32 of the outer ring 3, and a discharge groove 34 is provided that slopes from the deepest part of the raceway groove 31 so that the end surface side becomes lower in the axial direction. is provided. When installing the bearing 1, the outer ring 3 is fixed to a fixed part so that the discharge groove 34 is located downward. A part of the wear powder generated inside the bearing 1 is pushed out in the axial direction from the outer circumferential surface 32 of the outer ring 3 to the tapered portion 33, and is discharged to the outside of the bearing. In addition, wear particles coming out of the raceway grooves 21 and 31 accumulate in the deepest part of the raceway groove 31 due to gravity, and are further discharged from the bearing through an inclined discharge groove 34. In addition, in the case where the retainer is guided to the outer circumferential surface 22 of the inner ring 2 via the guide gap g, the outer circumferential surface 22 is provided with a tapered portion that is inclined in the axial direction. Further, the shape of the discharge groove is not limited to a half-moon shape, and a plurality of discharge grooves may be provided at intervals on the inner peripheral surface of the outer ring.

[0007]

[Effect of the idea]

As described above, according to the present invention, the wear powder of the bearing is actively discharged outside the bearing. Therefore, bearing friction torque and its fluctuations are reduced. In addition, the cage due to wear particles We can provide ball bearings with solid lubrication that reduce wear and maintain stable bearing life. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a side sectional view showing a conventional example.

[Explanation of symbols]

1 Ball bearing 2 Inner circle 21, 31 Raceway groove 3 Outer ring 32 Inner peripheral surface 33 Tapered part 34 Discharge groove 4 balls 5 Cage

Claims (1)

[Scope of utility model registration request] 1. An inner ring having a raceway groove on the outer periphery, an outer ring having a raceway groove on the inner periphery, a plurality of balls that can roll within the raceway grooves of the inner ring and the outer ring, and a plurality of balls that roll along the raceway groove. A solid lubricated ball bearing equipped with a cage that holds balls at regular intervals and rollable, wherein the solid lubricated ball bearing is provided with an outer circumferential surface of the inner ring or an inner circumferential surface of the outer ring and is inclined in the axial direction. What is claimed is: 1. A solid lubricated ball bearing comprising: a drain groove that is inclined toward the axial direction from the deepest part of the raceway groove of the outer ring.