JP2007270948A - Divided roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a divided roller bearing which can suppress the skewing of rollers by means of an outer race, and also can prevent the drop out of the rollers from a retainer in the absence of a bearing ring. <P>SOLUTION: The divided roller bearing comprises the outer race 1 which has flange portions 2a, 2b at both its end portions in the axial direction so as to project toward its axis, a plurality of rollers 3 arranged along the raceway surface of the outer race 1, and a retainer 5 for retaining the rollers 3. The retainer 5 is configured so that the retainer 5 comprises a thick body portion 6 having the outside diameter larger than the inside diameters of the flange portions 2a, 2b of the outer race 1, retainer flange portions 7a, 7b which are provided in the lower portions of both end portions of the body portion 6 in the axial direction and have the outside diameters smaller than the inside diameters of the flange portions 2a, 2b of the outer race 1, pockets which are arranged at a required interval in the peripheral direction of the body portion 6 so as to reach a part of the retainer flange portions 7a, 7b, and roller holders formed at upper and lower portions of the inside walls of the pockets so as to oppose to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a split roller bearing used when it cannot be mounted in an annular state, such as a camshaft bearing of an engine, for example.

  A conventional split roller bearing includes a half-thin and thin cage in which a roller is incorporated, and a half outer ring that is assembled to the outer periphery of the roller (see, for example, Patent Document 1).

JP 2001-12214 A (2nd page, FIG. 4)

In the split roller bearing in which the outer ring has a structure with no flanges at both ends thereof for reasons such as easy division processing as in Patent Document 1, there is no axial pressing between the roller and the cage. There is a possibility that the roller and the cage may drop off before the bearing assembly, or the roller may move in the axial direction during operation even after assembly to come into contact with the counterpart member in the axial direction, resulting in a torque increase.
Also, during the bearing operation, the force generated by the roller skew is received by the cage, so the pillar part and the annular part at both ends need to be dimensioned to ensure strength. The number and length of rollers were limited, and the load capacity of the bearing could not be increased.

  The present invention has been made to solve the above-described problems, and suppresses the axial movement of the roller and the cage during operation, and also provides hooks at both ends of the outer ring that receives the skew force of the roller, It is an object of the present invention to provide a split roller bearing having a structure in which a roller does not fall off in a radial direction from a cage even when there is no ring.

  The present invention relates to a split roller comprising an outer ring having flanges extending in the inner diameter direction at both ends in the axial direction, a plurality of rollers disposed along a raceway surface of the outer ring, and a cage that holds the rollers. In the bearing, the retainer is provided with a thick main body portion having an outer diameter larger than an inner diameter of the outer ring flange portion, and an inner diameter of the outer ring flange portion provided at a lower portion of both end portions in the axial direction of the main body portion. A pocket that covers a part of the retainer collar at predetermined intervals in the circumferential direction of the main body, and is opposed to the upper and lower sides of the inner wall surface of the pocket. Thus, a roller stopper is provided.

  A lightening portion was provided on the outer diameter side and / or the inner diameter side of the main body of the cage.

  According to the split roller bearing of the present invention, the rollers are held in the radial direction by the roller stoppers provided on the inner and outer diameter sides of the cage, and the axial movement of the rollers and the cage is suppressed by the flange portion of the outer ring. In addition, since the roller skew force is received at the flange portion, there is no need for a dimension for securing the strength of the cage, and the number and length of the rollers are not limited, so that the bearing load capacity can be increased. .

[Embodiment 1]
1 is a cross-sectional view of a main part of a split roller bearing according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of a pocket portion of the cage of FIG. 1, and FIG. 3 is a perspective view of a main part of the cage of FIG. FIG. In the following description, the upper side of the drawing is referred to as the outer diameter side, and the lower side is referred to as the inner diameter side.
In the figure, reference numeral 1 denotes a semicircular outer ring obtained by dividing a cylindrical member made of a metal material (hereinafter, this bearing is divided into two parts). 2a and 2b are provided.

  5 is a semi-circular cage formed by dividing a cylindrical member made of a metal material, a synthetic resin material, etc. into a thick body having an outer diameter larger than the inner diameter of the flange portions 2a and 2b of the outer ring 1. Part 6 and cage cage parts 7a, 7b having outer diameters smaller than the inner diameters of collar parts 2a, 2b of outer ring 1 provided at the lower part of both axial end parts, and in the circumferential direction of main body part 6 Are provided with pockets 8 for holding the rollers 3 reaching the cage flanges 7a, 7b at a predetermined interval. Reference numerals 9a and 9b denote roller stoppers provided on the inner wall of the pocket 8 so as to be opposed to each other on the upper and lower sides in the axial direction. The roller stoppers 9a and 9b may be provided above and below the central portion in the axial direction.

The axial length L ₃ of the cage 5 is substantially equal to or less than the axial length L of the outer ring 1, and the length L ₄ of the main body 6 is the length of the flanges 2 a and 2 b of the outer ring 1. It is formed slightly narrower than the inner space L ₁ , and the length L ₅ of the pocket 8 is substantially equal to or slightly longer than the length L ₂ of the roller 3. The thickness t of the main body is slightly smaller than the outer diameter of the roller 3.

In the above-described split roller bearing, the rollers 3 are assembled in the pockets 8 of the cage 5. As a result, as shown in FIG. 4, the rollers 3 are held on both sides of the outer periphery thereof by the roller stoppers 9a and 9b, and are prevented from falling off.
And the cage | basket 5 divided into 2 by which the roller 3 was integrated in each pocket 8 is assembled | attached from the both sides to the axis | shaft of a cam shaft, for example, and the outer ring | wheel 1 is assembled | attached to the outer periphery.

Thereby, the roller 3 is located in contact with or close to the raceway surface of the outer ring 1 and the inner wall surfaces of the flange portions 2a and 2b. Further, the wall surface of both end portions of the outer diameter side (upper surface) and the axial direction of the body portion 6 of the cage 5, the track surface and the flange portion 2a of the outer ring 1, between an inner wall surface of the 2b, a predetermined gap g ₁ , G _2, and the outer diameter side (upper surface) of the cage flanges 7 a, 7 b is positioned with a predetermined gap g ₃ from the inner diameter side (lower surface) of the flanges 2 a, 2 b of the outer ring 1. To do.

  In the split roller bearing configured as described above, since the main body 6 of the cage 5 is configured to be thick, roller stoppers 9a and 9b can be provided in the pocket 8, and the outer periphery of the roller 3 is a roller stopper 9a. 9b, and cage holders 7a and 7b are provided at the lower portions of both end portions in the axial direction of the body portion 6 so as to prevent separation in the axial direction. There is no skew.

  Further, when the cage 5 is pushed in the axial direction by the roller 3 and a force is applied, the end face in the axial direction of the main body portion 6 is prevented from coming into contact with the inner wall surfaces of the flange portions 2a and 2b of the outer ring 1, It is possible to prevent the torque from being increased and an extra force from being applied to the cage 5.

[Embodiment 2]
FIG. 5 is a cross-sectional view of the pocket portion of the cage of the split roller bearing according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, an outer diameter side (upper surface) and / or an inner diameter side (lower surface) of the main body portion 6 of the cage 5 are provided from the central portion in the axial direction (width direction) to both sides to provide the lightening portion 10. The lever is made thin to reduce weight. In addition, the cross-sectional shape of the lightening portion 10 is not limited to the illustrated shape, and may be another cross-sectional shape as long as it does not affect the strength of the cage 5.

  According to the present embodiment, the same operation and effect as in the case of Embodiment 1 can be obtained. However, since the body portion 6 is provided with the lightening portion 10, the cage 5 can be reduced in weight.

  In the above embodiment, the split roller bearing in which the outer ring 1 and the cage 5 are divided into two parts has been described. However, the present invention is not limited to this, and the present invention is also applied to a split roller bearing having one part or three parts or more. Can be implemented.

It is sectional drawing of the principal part of the split roller bearing which concerns on Embodiment 1 of this invention. It is sectional drawing of the pocket part of the holder | retainer of FIG. It is a perspective view of the principal part of the holder | retainer of FIG. It is explanatory drawing which shows the state which integrated the roller in the holder | retainer. It is sectional drawing of the pocket part of the holder | retainer of the split roller bearing which concerns on Embodiment 2 of this invention.

Explanation of symbols

1 outer ring, 2a, 2b collar part, 3 rollers, 5 cage, 6 body part, 7a, 7b cage cage part, 8 pockets, 9a, 9b roller stopper, 10 lightening part.

Claims (2)

In a split roller bearing comprising an outer ring having flanges facing in the inner diameter direction at both axial ends, a plurality of rollers disposed along the raceway surface of the outer ring, and a cage that holds the rollers,
The retainer has an outer diameter smaller than an inner diameter of a thick main body portion having an outer diameter larger than an inner diameter of the flange portion of the outer ring, and lower portions of both end portions in the axial direction of the main body portion. A retainer flange portion having a diameter dimension, and a pocket is formed on a part of the retainer flange portion at a predetermined interval in the circumferential direction of the main body portion, and rollers are opposed to the upper and lower sides of the inner wall surface of the pocket. A split roller bearing characterized by comprising a stopper. The split roller bearing according to claim 1, wherein a hollow portion is provided on the outer diameter side and / or the inner diameter side of the main body of the cage.

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