JPH08326759A - Double row roller bearing - Google Patents

Abstract

PURPOSE: To improve lubricating ability of the part where the end faces of rollers are slidingly contacted with each other, the part where the end faces of rollers are slidingly contacted with the bottom faces of the pockets of a retainer, and between the outer diametral face of the retainer as the guide for an outer ring and the outer ring. CONSTITUTION: In a no intermediate flange type roller matching type self- aligning bearing of which rollers 4, 4 of both rows are contated with each other at the end faces, double row rollers 4, 4 held with a retainer 3 are interposed between an inner ring 1 and an outer ring 2, and hollow holes 5 penetrating the rollers 4, 4 of both rows in the axial direction are formed. The retainer 3 is an integrated type machined cage as the guide for the outer ring, and pillar parts 3b are projected on both sides of a ring part 3a so as to form pockets 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double row roller bearing such as a self-aligning roller bearing used in a place where a large vibration or impact such as a vibrating screen is received, and particularly, rollers of both rows are arranged in contact with each other. Double row roller bearings.

[0002]

2. Description of the Related Art Conventionally, in a self-aligning roller bearing for anti-vibration and anti-shock load, a retainer 53 is an integrally machined cage with outer ring guide as shown in FIG. It has a contact structure. The roller end faces are brought into contact with each other in order to reduce the bearing width to reduce the weight or to increase the length of the roller relative to the bearing width to increase the load capacity.

[0003]

In this structure, the lubricating oil entering from the side surface of the bearing improves the lubricity of the outer diameter surface of the cage 53 and the raceway surface of the outer ring 52 by the flow indicated by the arrow a. . However, it is difficult for the lubricating oil to reach between the large end surface A of the roller 53 and the pocket bottom surface B of the cage 53. Further, it is difficult for the lubricating oil to reach the portion C where the roller end faces contact each other.

An object of the present invention is to improve the lubricity of the parts where the end faces of the rollers are in sliding contact with each other and the parts where the end faces of the rollers are in sliding contact with the bottom surface of the pocket of the cage, and the weight can be reduced. It is to provide a bearing. Another object of the present invention is to provide a double row roller bearing which can improve the lubricity between the outer diameter surface of the cage used as the outer ring guide and the outer ring.

[0005]

In the double row roller bearing of the present invention, the rollers of both rows interposed between the inner ring and the outer ring are inclined in opposite directions with respect to the axial center, and the rollers of both rows have end faces. In the double-row roller bearings that are in sliding contact with each other at their edges, each of the rollers is provided with a hollow hole that opens at the contact side end surface. The double row roller bearing may be a self-aligning roller bearing. In this case, the hollow hole of the roller is a hole penetrating in the axial direction,
And the cage is a machined cage of outer ring guide,
The pillars may be projected on both sides of the ring portion, and the spaces between the pillars may be pockets for holding the rollers.

[0006]

According to this structure, since each roller is provided with the hollow hole opened on the end face on the contact side, the lubricating oil in this hole is used for the sliding contact portion between the rollers of both rows and the roller end face and the bottom face of the cage pocket. Supplied to the sliding contact part with. If the hollow hole of the roller is a through hole, the lubricating oil is guided from the outer end surface of the roller through the inside of the roller to between the rollers of both rows, and the sliding contact part between the rollers of both rows and between the roller end surface and the cage. It is supplied to the sliding contact with the bottom of the pocket. When the cage is an outer ring guide, the lubricating oil passing through the inside of the rollers is also guided to the sliding contact portion of the outer diameter surface of the cage with the outer ring. Therefore, the lubricity of these sliding contact parts can be improved. Further, by making the rollers hollow, the weight of the bearing is reduced and the inertia is also reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. This embodiment is applied to a roller-butting type bearing without a central collar in a self-aligning roller bearing.
Between the inner ring 1 and the outer ring 2, double-row rollers 4 and 4 held by a cage 3 are interposed. The inner ring 1 has the collars 1a at both ends and does not have the middle collar, and the pair of raceway surfaces 1b, 1
b is formed in a shape in which the axes of the rollers 4 and 4 in both rows are inclined in opposite directions. The outer ring 2 has a raceway surface 2a having a spherical shape over the entire width. The rollers 4 of each row have a spherical shape in which the peripheral surface bulges into a spherical shape, and have a slight taper with the large diameter end on the center side of the bearing. Each roller 4 is made hollow by providing a hollow hole 5 penetrating in the axial direction in the axial center portion. The cage 3 is a machined cage of the outer ring guide type. As shown in FIG. 1C, the pillar portions 3b project on both sides of the ring portion 3a, and the roller 4 is held between the adjacent pillar portions 3b and 3b. It becomes a pocket 6 that is played.

According to this structure, as in the conventional case, the lubricating oil that has entered from the side surface of the bearing flows between the outer diameter surface of the cage 3 and the outer ring 2 in the flow shown by the arrow a, and the outer diameter surface of the cage. The lubricity of the outer ring 2 and the rollers 4
Due to the centrifugal force that accompanies the rolling of the cage,
A lubricating oil flow is generated on the side surface of the ring portion 3a which is the bottom surface of the pocket. When this lubricating oil flow hits the cage side surface B, the lubricating oil easily flows into the roller large end surface A and the contact portions C between the rollers 4 and 4 in both rows. Therefore, a portion where the roller end surface A and the cage side surface B are in sliding contact,
The lubricity of the portion C where the end faces of the rollers 4 make sliding contact is improved. In addition, this type of roller butt bearing is a compact type in which the bearing width is narrowed because the inner ring 1 does not have a middle collar, and the weight is reduced, or the roller length is increased relative to the bearing width to reduce the load. Although the capacity is increased, the weight of the entire bearing is further reduced and the inertia is also reduced by making the roller 4 hollow by forming the hollow hole 5 in addition to this.

In the above embodiment, the hollow hole 5 of the roller 3
However, as shown in FIG. 2 (A), the hollow hole 5A of the roller 3 may have a recessed shape which is open only on the contact side end face. Further, as shown in FIG. 2B, the roller 3 may be provided with a pair of hollow holes 5B and 5C which are open at both end surfaces.

[0010]

The bearing of the present invention is a double-row roller bearing in which the rollers of both rows are in sliding contact with each other at the edges of the end faces, and since each roller is provided with a hollow hole that opens to the contact side end face, Lubricity is improved in the portions in sliding contact with each other and in the portions in which the roller end surface and the bottom surface of the cage pocket slide, and the bearing weight is reduced. In particular, in the case of a self-aligning roller bearing, it is often the case that the rollers in both rows come into contact with each other, and it is possible to effectively lubricate a bearing of this type. When the hollow hole of each roller is a hole that penetrates in the axial direction, the lubricating oil is guided from the outer end surface of the roller through the inside of the roller to between the rollers of both rows, so that the sliding contact portion between the rollers of both rows and Lubricating oil can be more favorably supplied to the sliding contact portion between the roller end surface and the cage pocket bottom surface, and the lubricity is further improved. When the cage is of an outer ring guide, the lubricity at the sliding contact portion between the outer surface of the cage and the outer ring is also improved.

[Brief description of drawings]

1A is a partially cutaway sectional view of an embodiment of the present invention, FIG. 1B is a sectional view of a roller thereof, and FIG. 1C is a partial perspective view of a cage thereof.

2 (A) and 2 (B) are partial cross-sectional views showing the relationship between the cage according to another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Inner ring, 2 ... Outer ring, 3 ... Retainer, 3a ... Ring part, 3
b ... pillar part, 4 ... roller, 5, 5A to 5C ... hollow hole, 6 ... pocket,

Claims (3)

[Claims] 1. A double row roller bearing in which rollers in both rows interposed between an inner ring and an outer ring are inclined in opposite directions with respect to an axial center, and rollers in both rows are in sliding contact with each other at edges of end faces,
A double row roller bearing, characterized in that each of the rollers is provided with a hollow hole that opens at the contact side end surface. 2. The double row roller bearing according to claim 1, wherein the roller bearing is a self-aligning roller bearing. 3. The hollow hole of the roller is a hole penetrating in the axial direction, and the retainer is a machined retainer for guiding an outer ring, and column portions project on both sides of the ring portion, and between the column portions. The double row roller bearing according to claim 2, wherein is a pocket for holding the roller.