JP2003166543A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing avoiding filling deficiency of a solid lubricant into the space between the outer ring raceway face and the outer peripheral face of the cage and enabling stable rotation. <P>SOLUTION: In the tapered roller bearing 10, a plurality of rolling bodies 12 retained in the pocket 11a of the cage 11 are incorporated between a pair of inner and outer rings 13, 14 having respective raceway faces 13a, 14a. In the bearing 10, the solid lubricant 15 is filled. The pushing face 11b of the pocket aperture of the cage 11 is arranged substantially parallel to the tangential line of the outer peripheral circle of the rolling body 12. The pushing angle ρof the pocket aperture is formed 20-35°. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing in which a plurality of rolling elements held in a pocket of a cage are incorporated between a pair of inner and outer races each having a raceway surface, and a solid lubricant is filled therein. Concerning the structure of.

[0002]

2. Description of the Related Art Conventionally, as a rolling bearing, there is a tapered roller bearing in which a plurality of rolling elements held in respective pockets of a cage are incorporated between a pair of inner and outer rings each having a raceway surface. The inside of this bearing is filled with solid lubricant,
The inner and outer rings, the rolling elements, and the cage, respectively, are held so that they cannot be disassembled.

In the above tapered roller bearing, in order to increase the rated load as much as possible within the predetermined size and shape, the strength of the cage is taken into consideration, and as many rolling elements (rollers) as possible are designed so as not to cause geometrical interference. Has been done. In this case, in order to inevitably design the column width of the cage pocket to be large, in consideration of the amount of movement during rotation of the cage, up to the position where the outer peripheral surface of the cage does not contact the outer ring raceway surface, It is designed to move the cage toward the outer ring raceway side. For this reason,
Usually, the pocket window pushing angle formed by the pocket window pushing surface is designed to be 36 ° or more.

[0004]

However, when the solid lubricant is filled in the bearing, the solid lubricant may not be sufficiently filled because the gap between the outer ring raceway surface and the cage outer peripheral surface is small. Such a phenomenon is caused especially by the outer diameter φ1.
Remarkably appears in tapered roller bearings of 00 mm or less. If the solid lubricant cannot be filled sufficiently, the solid lubricant will roll up or fall off when the bearing rotates, causing a gap between the race and the rolling element.
Further, there is a problem that the bearing is sandwiched between the cage and the rolling element, the rotation of the bearing is restricted, and a locking phenomenon occurs.

According to the present invention, the distance between the outer ring raceway surface and the outer peripheral surface of the cage can be ensured to be a predetermined value or more even when the distance between the outer ring raceway surface and the outer peripheral surface of the cage is minimized by the movement of the cage. An object of the present invention is to provide a rolling bearing capable of avoiding insufficient filling of lubricant and enabling stable rotation.

[0006]

The above object of the present invention is to provide a plurality of rolling elements respectively retained in pockets of a cage,
In a rolling bearing that is installed between a pair of inner and outer races each having a raceway surface and is filled with a solid lubricant, the pocket window pushing angle formed by the pocket window pushing surface of the cage is 20 ° to 35 °. It can be achieved by a rolling bearing characterized in that

Further, it is preferable that the large-diameter side tip portion of the cage is bent at a predetermined angle toward the bearing center side.

According to the rolling bearing of the present invention, since the pocket window pushing angle is 20 ° to 35 °, the distance between the gap between the outer ring raceway surface and the cage outer peripheral surface is minimized by the movement of the cage. Even if it becomes, 0.45 mm or more is maintained. Therefore, the solid lubricant is sufficiently filled between the voids.

Further, according to the rolling bearing of the present invention,
Since the large-diameter side tip portion is bent toward the bearing center side by a predetermined angle, a sufficient gap is secured between the outer ring raceway surface and the cage outer peripheral surface. Therefore, sufficient solid lubricant can be filled between the outer ring raceway surface and the cage outer peripheral surface, and peeling or cutting of the solid lubricant during rotation can be reliably prevented.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the rolling bearing of the present invention will be described in detail below with reference to FIGS. 1 and 2. Figure 1
2 is a cross-sectional view showing an embodiment of the rolling bearing of the present invention, and FIG. 2 is a cross-sectional view seen from the direction of arrow A in FIG.

As shown in FIGS. 1 and 2, in the tapered roller bearing 10 of this embodiment, a plurality of rolling elements (rollers) 12 respectively held in pockets 11a of a cage 11 have raceway surfaces 13a, It is incorporated between a pair of inner and outer rings 13, 14 having 14a.

A solid lubricant 15 is filled in the bearing 10 by means such as injection molding after the completion of assembly of the inner and outer races 13 and 14 and the retainer 11, for example. By the filling of the solid lubricant 15, the movement of the rolling elements 12 and the cage 11 with respect to the inner and outer rings 13, 14 in the axial direction (the axial direction of the shaft supported by the bearings, the horizontal direction in FIG. 1) is restricted, and the inner ring 13 is prevented. It is possible to prevent easy removal from the car. As a result, the inner and outer rings 1
3, 14, the rolling elements 12, and the cage 11 are held so as not to be disassembled.

As the solid lubricant 15, for example, a lubricant-containing polymer is used. Specifically, a raw material prepared by mixing a synthetic resin with a lubricant is heated above the melting point of the synthetic resin to be plasticized, and then cooled to be solidified. The composition ratio is 10 to 5 synthetic resin based on the total weight.
It is preferable that the content is 0% by weight and the lubricant is 90 to 50% by weight.

Specific examples of the synthetic resin include those selected from the group of polyolefin resins having basically the same chemical structure such as polyethylene, polypropylene, polybutylene and polymethylpentene. Specific examples of lubricants include paraffin hydrocarbon oils such as poly-α-olefin oils, naphthene hydrocarbon oils, mineral oils, ether oils such as dialkyldiphenine ether oils, and phthalate esters. Examples thereof include any one of ester oil and the like, which is used alone or as a mixed oil. Various additives such as an antioxidant, a rust inhibitor, an antiwear agent, an antifoaming agent, and an extreme pressure agent may be added to the lubricating oil in advance.

The pocket window pushing surface 11b of the cage 11 is
It is substantially parallel to the tangent line of the outer circumference of the rolling element 12, and
The pocket window pushing angle ρ shown in is within the range of 20 ° to 35 °. As a result, the outer ring 1
The gap distance δ between the raceway surface 14a of No. 4 and the outer peripheral surface 11c of the retainer 11 can be kept at 0.45 mm or more even when it is minimized by the movement of the retainer 11.

The large diameter side of the cage 11 (right side in FIG. 1)
The tip portion 11d is bent toward the center of the bearing 10 by a predetermined angle, and a sufficient gap B with the outer ring raceway surface 14a is secured. As a result, a sufficient amount of the solid lubricant 15 is provided in the void B.
It is possible to reliably avoid peeling or cutting of the solid lubricant 15 in the vicinity of the large-diameter-side tip portion 11d of the cage 11 when the cage 11 is rotated.

In the tapered roller bearing 10 of this embodiment, the pocket window pushing angle ρ of the cage 11 is set to 20 ° to 35 °, and the circumferential position of the cage 11 is set to the bearing 10 center position. They are placed close together. Therefore, even if the gap distance δ between the outer ring raceway surface 14a and the cage outer peripheral surface 11c is minimized by the movement of the cage 11, it is 0.45.
It is possible to secure mm or more. In addition, when the column width of the cage 11 becomes narrow as a result of shifting the circumferential position of the cage 11 to the center position of the bearing 10, it is calculated by the required calculation in order to maintain the cage strength. It is also possible to reduce the number of rolling elements 12 within an allowable range of the rated load that satisfies the rolling fatigue life.

As described above, according to the above embodiment, since the pocket window pushing angle ρ of the cage 11 is set within the range of 20 ° to 35 °, the outer ring raceway surface 14a and the cage outer peripheral surface 11c. Even if the distance δ between the voids and is minimized by the movement of the cage 11, it can be kept at 0.45 mm or more. As a result, the solid lubricant 15 can be sufficiently filled in the voids, shortage of filling can be avoided, and the necessary thickness of the solid lubricant 15 can be secured.

[0019]

As described above, according to the rolling bearing of the present invention, the pocket window pushing angle of the cage is 20 ° to 35 °.
°. Therefore, the distance between the gap between the outer ring raceway surface and the outer peripheral surface of the cage can be set to a predetermined value or more even when the distance is minimized due to the movement of the cage. Therefore, it is possible to avoid insufficient filling of the solid lubricant into the voids, and it is possible to maintain stable rotation.

Further, the large-diameter end of the cage is bent toward the bearing center side by a predetermined angle. Therefore, a sufficient gap can be secured between the outer peripheral surface of the cage and the outer raceway surface, and a sufficient amount of solid lubricant can be filled. Therefore, peeling or cutting of the solid lubricant during rotation can be reliably avoided.

[Brief description of drawings]

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

2 is a cross-sectional view as seen from the direction of arrow A in FIG.

[Explanation of symbols]

10 Tapered roller bearing (rolling bearing) 11 cage 11a pocket 11b Pocket window pushing surface 11c Cage outer peripheral surface 11d Tip of large diameter side of cage 12 rolling elements (rollers) 13 inner ring 13a Inner ring raceway surface 14 outer ring 14a Outer ring raceway surface 15 Solid lubricant ρ Pocket window pushing angle δ Gap distance between outer ring raceway surface and cage outer peripheral surface

Claims (2)

[Claims] 1. A rolling bearing in which a plurality of rolling elements respectively held in pockets of a cage are incorporated between a pair of inner and outer rings each having a raceway surface, and a solid lubricant is filled in the rolling bearing. Rolling bearing, wherein the pocket window pushing angle formed by the pocket window pushing surface of the container is 20 ° to 35 °. 2. A large-diameter side tip portion of the cage is bent toward the bearing center side by a predetermined angle.
Rolling bearing described.