JP2006214466A - Retainer for roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a roller in an ideal posture by preventing occurrence of skewing caused by the abutting between the end part of the roller and that of a roller guide face even when falling-down of a column occurs due to variation in machining of a retainer. <P>SOLUTION: A relief shape is provided at the four corner parts of a pocket with the following numerical values to the advance direction of the roller. It is set so as to be 0.02≤▵1≤0.35, 0.02≤▵2≤0.35, 0.1×WC≤▵3≤0.35×WC, and 0.1×WC≤▵4≤0.35×WC. Here, ▵1 is a relief depth (the large diameter side) in the circumferential direction, ▵2 is a relief depth (the small diameter side) in the circumferential direction, and ▵3 is a relief width (the large diameter side), ▵4 is a relief width (the small diameter side), and WC is a dimension of a pocket length. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roller bearing retainer used for a roller bearing used in various industrial machines.

  FIG. 3 is a schematic view for explaining a pocket shape of a roller bearing retainer according to a conventional example.

  The tapered roller bearing is provided with a cage A that holds a number of rollers B of the rolling elements at a predetermined interval. The cage A has a large number of pockets C for storing the rollers B.

  As shown in FIG. 3, the shape of the pocket C of the cage A according to the conventional example is such that the roller guide surface 22 on the roller rolling surface 21 side is straight and contacts R25 and R26 at four corners R. Further, the guide surfaces 23 and 24 on the roller end face side also contact R25 and R26 at the four corners R.

  However, when the column collapse occurs due to variations in the processing of the cage A, in the conventional technology, the roller guide surface 22 on the roller rolling surface 21 side is straight, so the roller guide surface 22 is the roller rolling surface. The end of 21 will contact locally and the posture of roller B will be destroyed.

  As a result, during operation, the roller B skews and rotates and revolves in an unstable state, causing the following problems.

  For example, the rotation accuracy decreases and the sound deteriorates. Further, the contact surface pressure due to the local contact at the roller rolling surface 21 and the end portion of the guide surface 22 increases, and wear progresses at the contact portion between the roller guide surface 22 and the roller B. Furthermore, slippage may occur between the raceway surfaces of the outer ring and the inner ring due to the skew and the roller rolling surface 21, and torque increase, wear progress, heat generation, seizure, and the like may occur.

  The present invention has been made in view of the above-described circumstances, and even when a column collapse occurs due to variations in the processing of the cage, the roller is prevented from skewing due to the end portion with the guide surface. An object of the present invention is to provide a roller bearing retainer that can stabilize the roller in an ideal posture.

In order to achieve the above object, a roller bearing retainer according to claim 1 of the present invention is a roller bearing retainer that retains rollers of a number of rolling elements at a predetermined interval.
In the four corners of the pocket, a relief shape is provided with the following numerical values with respect to the roller traveling direction,
0.02 ≦ △ 1 ≦ 0.35
0.02 ≦ △ 2 ≦ 0.35
0.1 × WC ≦ Δ3 ≦ 0.35 × WC
0.1 × WC ≦ Δ4 ≦ 0.35 × WC
Where
△ 1 is the circumferential clearance depth (large diameter side),
△ 2 is the circumferential clearance depth (small diameter side)
Δ3 is the clearance width (large diameter side)
△ 4 is the clearance width (small diameter side)
WC is characterized by a pocket length dimension.

  According to the present invention, since the relief shape is provided with the above numerical values with respect to the traveling direction of the rollers at the corners of the pocket 4, even when a column collapse occurs due to variations in the processing of the cage, The roller can be prevented from skewing due to the end portion with the guide surface, and the roller can be stabilized in an ideal posture.

  Hereinafter, a roller bearing retainer according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram for explaining a pocket shape of a roller bearing retainer according to an embodiment of the present invention.

  In the illustrated example, a tapered roller bearing is shown, but the same applies to a cylindrical roller bearing, and it can be applied to both radial bearing and thrust bearing types.

  The tapered roller bearing is provided with a cage A that holds a number of rollers B of the rolling elements at a predetermined interval. The cage A has a large number of pockets C for storing the rollers B. As for the shape of the pocket C of the cage A, the roller guide surface 22 on the roller rolling surface 21 side is straight.

  In the present embodiment, even when a column collapse occurs due to variations in the processing of the cage A, contact between the end of the roller rolling surface 21 and the end of the guide surface 22 is avoided, and the roller B is in its central portion. In order to be guided to the cage A in the vicinity, the four corner relief shapes of the pocket C are numerically limited as follows.

  In order for the cage A to correctly guide the roller B during rotation, it is experienced that if the contact length S of the roller B and the guide surface 22 is 30% or more of the cage pocket length WC, the function can be sufficiently exerted. Known.

On the other hand, when the column collapse of the cage A occurs, in order to avoid contact at the end of the column, that is, at the end of the rolling surface 21, the contact length S of the roller B is guided by the guide surface 22 of the cage A. It may be 80% or less of the pocket length WC. That means
0.3 × WC ≦ S ≦ 0.8 × WC.
Here, since it is ideal that the clearance width is Δ3 = Δ4, 0.1 × WC ≦ Δ3 = Δ4 ≦ 0.35 × WC (1)
It becomes.

Next, in order to avoid contact between the end of the roller rolling surface 21 and the end of the guide surface 22 when the column collapse of the cage A occurs, the following escape amount is required.
Necessary escape amount (large diameter side) Δ1 = Δ3 × a / WC
Necessary escape amount (small diameter side) Δ2 = Δ4 × a / WC
However, a: Pillar collapse amount of the cage (see FIG. 3)
The amount of column collapse a of the cage A is empirically
0.2 ≦ a ≦ 1 (2)
From the formulas (1) and (2), the escape amount is
0.02 ≦ Δ1 = Δ2 ≦ 0.35.

From the above, the four corner relief shape of the pocket C is determined by the following relational expression.
0.02 ≦ Δ1 = Δ2 ≦ 0.35
0.1 × WC ≦ Δ3 = Δ4 ≦ 0.35 × WC

  Next, in the cage A used for the roller bearing, by providing relief shapes as described above with respect to the traveling direction of the roller B at the four corners of the pocket C, column collapse occurs due to variations in processing of the cage A. Even when it occurs, contact between the end of the roller rolling surface 21 and the end of the guide surface 22 is avoided, and the roller B is guided to the cage A in the vicinity of the center thereof.

  As a result, skew caused by the end contact with the roller B and the guide surface 22 is prevented, and the roller B is stabilized in an ideal posture. It is possible to suppress the occurrence of wear at the roller contact portion of the surface 22, wear at the outer and inner ring raceway surfaces and the roller rolling surface 21, torque increase, heat generation, seizure and the like.

  Next, FIG. 2 shows the results of measuring axial run-out in the conventional product (product without escape) and the product of the present invention (product with relief).

  In the conventional product, the axial runout of 3 out of 10 is not stable, but in the product of the present invention, all are stable and the rotation accuracy is improved.

  Conventionally, the four corner R dimensions (R25, R26) of the pocket C have to be set smaller than the roller chamfer dimension in order to avoid interference with the roller chamfered portion. By providing relief at the corners, the four corner R dimensions can be set to (R25 + Δ1) or (R26 + Δ2). That is, since the four corner R dimensions can be made larger than before, stress concentration at the R portion can be relaxed and the cage strength can be improved.

  Further, in the case of grease lubrication, the relief portions at the four corners of the pocket C serve as a grease reservoir, so that the lubricity becomes better than the conventional one and the life extension can be expected.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

It is a schematic diagram for demonstrating the pocket shape of the cage for roller bearings concerning embodiment of this invention. The axial run-out measurement results for the conventional product (product with no relief) and the product of the present invention (product with relief) are shown. It is a schematic diagram for demonstrating the pocket shape of the cage for roller bearings which concerns on a prior art example.

Explanation of symbols

A Cage B Roller C Pocket 21 Roller rolling surface 22 Roller guide surface

Claims (1)

In a roller bearing retainer that holds a large number of rolling element rollers at a predetermined interval,
In the four corners of the pocket, a relief shape is provided with the following numerical values with respect to the roller traveling direction,
0.02 ≦ △ 1 ≦ 0.35
0.02 ≦ △ 2 ≦ 0.35
0.1 × WC ≦ Δ3 ≦ 0.35 × WC
0.1 × WC ≦ Δ4 ≦ 0.35 × WC
Where
△ 1 is the circumferential clearance depth (large diameter side),
△ 2 is the circumferential clearance depth (small diameter side)
Δ3 is the clearance width (large diameter side)
△ 4 is the clearance width (small diameter side)
WC is a roller bearing cage characterized by having a pocket length dimension.

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