JP6439245B2 - Radial roller bearings - Google Patents

Description

  The present invention relates to a radial roller bearing, and more particularly to a radial needle bearing.

  As a conventional radial roller bearing, there is known one in which a reduction surface that is reduced in diameter toward the outer end in the axial direction is formed on the outer peripheral surface of the flange (rim portion) of the cage (see, for example, Patent Document 1). ).

JP 2006-283933 A

  However, in the radial roller bearing described in Patent Document 1, although the lubricity is improved by the reduced surface formed on the outer peripheral surface of the flange, since the cross-sectional thickness of the flange is not taken into account, for example, the roller diameter is large. In the case of a cage whose rollers are shorter than the axial width of the cage, as shown in FIG. 8, the radial width and the axial width of the flange are increased, and there is a difference in cooling rate between the surface and the interior during cage molding. As a result, sink marks and deformation occur in the flange, and the dimensional accuracy of the cage may not be ensured. In addition, the code | symbol of FIG. 8 is attached | subjected according to the code | symbol of the radial roller bearing 10 mentioned later.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radial roller bearing that can prevent sinkage and deformation of the flange of the cage and can ensure dimensional accuracy of the cage. It is to provide.

The above object of the present invention can be achieved by the following constitution.
(1) A cage having a pair of annular flanges arranged coaxially with each other, and a plurality of pillars arranged at substantially equal intervals in the circumferential direction between the pair of flanges and connecting the pair of flanges , a radial roller bearing comprising a roller which is held to each pocket formed between the pillar portions adjacent to each other in the circumferential direction of the cage, the meat to the respective outer and inner peripheral surfaces of the flange by forming over stealing portion all around, forming a flange on the cross-section substantially T-shaped, radial roller bearing, characterized by a thickness of the flange substantially equal.

According to the present invention, by forming over the thinned-out part in the entire periphery in each of the outer and inner peripheral surfaces of the flange, forming a flange on the cross-section substantially T-shaped, substantially equal the thickness of the flange Therefore, the difference in cooling rate between the surface and the interior during cage molding can be made substantially uniform, which can prevent sinkage and deformation of the flange of the cage and ensure the dimensional accuracy of the cage. can do.

It is sectional drawing explaining one Embodiment of the radial roller bearing which concerns on this invention. It is an expanded sectional view of the radial roller bearing shown in FIG. It is the sectional view on the AA line of FIG. It is an expanded sectional view explaining the 1st modification of one embodiment of a radial roller bearing concerning the present invention. It is an expanded sectional view explaining the 2nd modification of one embodiment of a radial roller bearing concerning the present invention. It is an expanded sectional view explaining the 3rd modification of one embodiment of a radial roller bearing concerning the present invention. It is an expanded sectional view explaining the 4th modification of one embodiment of a radial roller bearing concerning the present invention. It is an expanded sectional view explaining the conventional radial roller bearing.

  Hereinafter, one embodiment of a radial roller bearing concerning the present invention is described in detail based on a drawing.

  The radial roller bearing 10 of this embodiment is arrange | positioned between the housing 11 and the rotating shaft 12, for example as shown in FIGS. 1-3, and is a pair of annular | circular shaped arrange | positioned mutually coaxially. A retainer 20 made of synthetic resin having a flange 21 and a plurality of pillar portions 22 that are arranged at substantially equal intervals in the circumferential direction between the pair of flanges 21 and connect the pair of flanges 21; And rollers 30 respectively held in pocket portions 23 formed between column portions 22 adjacent to each other in the circumferential direction.

  As shown in FIG. 2 and FIG. 3, the flange 21 is formed with a stepped portion (meat stealing portion) 24 over the entire circumference on the outer side in the axial direction of the outer peripheral surface 21 a, and has a substantially L-shaped cross section. . And by forming this step part 24, it sets so that the maximum distance L1 which goes to the inside from the surface of the flange 21 may become below the maximum distance L2 which goes to the inside from the surface of the pillar part 22. FIG. Further, in the present embodiment, the step portion 24 is formed so that the thickness of the flange 21 having a substantially L-shaped cross section is substantially equal. Further, the inner peripheral surface 21 b of the flange 21 is formed on a straight surface along the axial direction of the flange 21.

  As described above, according to the radial roller bearing 10 of the present embodiment, the step 24 is formed on the outer peripheral surface 21a of the flange 21 over the entire circumference, whereby the maximum distance L1 from the surface of the flange 21 toward the inside. Is set to be equal to or less than the maximum distance L2 from the surface of the column portion 22 toward the inside, the difference in cooling rate between the surface and the inside at the time of molding of the cage can be made substantially uniform. 21 sinks and deformations can be prevented, and the dimensional accuracy of the cage 20 can be ensured. Furthermore, since the amount of the resin material used for the step portion 24 can be reduced, the cage 20 can be reduced in weight and the manufacturing cost can be reduced.

  In addition, the meat stealing part should just be formed in surfaces other than the axial direction inner end surface of the flange 21 facing the roller 30, for example, as shown in FIG. 4, as a 1st modification of this embodiment, A stepped portion 24 may be formed on the outer side in the axial direction of the inner peripheral surface 21 b of 21. In this case, the flange 21 is formed in a substantially inverted L shape in cross section. This modification is employed when the cage 20 is guided by the inner peripheral surface 21b or when the width direction of the cage 20 can be guided only by the outer peripheral surface 21a.

  Next, as a second modification of the present embodiment, as shown in FIG. 5, stepped portions 24 may be formed on the outer sides in the axial direction of the outer peripheral surface 21 a and the inner peripheral surface 21 b of the flange 21. In this case, the flange 21 has a substantially T-shaped cross section. According to this modification, the oil permeability of the bearing 10 can be improved.

  Next, as a third modification of the present embodiment, as shown in FIG. 6, the inner peripheral surface 21 b of the flange 21 may be formed as a tapered surface that expands toward the outer end in the axial direction. In this case, the oil permeability of the bearing 10 can be improved.

  Next, as a fourth modification of the present embodiment, as shown in FIG. 7, a concave groove (meat stealing portion) 34 is formed in the radial center portion of the axially outer end surface 21 c of the flange 21 instead of the stepped portion 24. May be formed over the entire circumference and may have a substantially U-shaped cross section.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, the radial roller bearing of the present embodiment is constituted by a cage and a plurality of rollers, but may be constituted by an outer ring, an inner ring, a cage, and a plurality of rollers.

DESCRIPTION OF SYMBOLS 10 Radial roller bearing 20 Cage 21 Flange 21a Outer peripheral surface 21b Inner peripheral surface 21c Axial outer end surface 22 Column part 23 Pocket part 24 Step part (Meat stealing part)
30 Roller 34 Groove (Meat stealer)
L1 Maximum distance inward from the surface of the flange L2 Maximum distance inward from the surface of the pillar

Claims (1)

A cage having a pair of annular flanges arranged coaxially with each other, and a plurality of pillars arranged at substantially equal intervals in the circumferential direction between the pair of flanges, and connecting the pair of flanges;
A roller that is held in each pocket portion formed between the column portions adjacent to each other in the circumferential direction of the cage, and a radial roller bearing comprising:
By forming over the thinned-out part in the entire periphery in each of the outer and inner peripheral surfaces of the flange, the flange is formed in cross-section substantially T-shaped, that the thickness of the flange substantially uniformly Radial roller bearing characterized by

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