Claims
- 1. A cylindrical window-type cage (1) for a needle roller bearing which receives the needle rollers (6) in pockets (5) uniformly spaced from one another by crossbars (4), said pockets (5) being formed by punching and by stamping with displacement of material in a cage strip (9) so that after the bending round of the cage strip (9) the needle rollers (6) are retained in inward direction by the inclination of the crossbar walls and in outward direction by retaining projections (7, 8), characterized in that, in the unbent state of the cage strip (9), the surfaces of the crossbar walls of a pocket (5) situated opposite each other are formed in the region of the retaining projections (7, 8) with three partial surfaces (10, 11, 12) such that the first partial surfaces (10) are parallel to a central vertical line (13) and merge at their upper ends into inclined second partial surfaces (11) pointing towards the center of the pocket, each of the second partial surfaces (11) ending in a third partial surface (12) which is likewise parallel to the central vertical line (13).
- 2. A cylindrical window-type cage (1) according to claim 1, characterized in that the ratio of the diameter DL of the needle rollers (6) to the pitch circle diameter DTK is >1:6.
- 3. A cylindrical window-type cage (1) for a needle bearing which receives the needle rollers (6) in pockets (5) uniformly spaced from one another by crossbars (4), said pockets (5) being formed by punching and by stamping with displacement of material in a cage strip (9) so that after the bending round of the cage strip (9), the needle rollers (6) are retained in inward direction by the inclination of the crossbar walls and in outward direction by retaining projections (7, 8), in the unbent state of the cage strip (9), the surfaces of the crossbar walls of a pocket situated opposite each other are formed in the region of the retaining projections (7, 8) with three partial surfaces (10, 11, 12) such that the first partial surfaces (12) are inclined relative to a central vertical line (13) and point towards the center of the pocket while merging at their upper ends into second partial surfaces (10) that are parallel to the central vertical line (13), each of the second partial surfaces (10) ending in a third partial surface (11) which is likewise inclined.
- 4. A cylindrical window-type cage (1) for a needle bearing which receives the needle rollers (6) in pockets (5) uniformly spaced from one another by crossbars (4), said pockets (5) being formed by punching and by stamping with displacement of material in a cage strip (9) so that after the bending round of the cage strip (9) the needle rollers (6) are retained in inward direction by the inclination of the crossbar walls and in outward direction by retaining projections (7, 8), in the unbent state of the cage strip (9), the surfaces of the crossbar walls of a pocket (5) situated opposite each other are formed in the region of the retaining projections (7, 8) with three partial surfaces (10, 11, 12) such that the first partial surfaces (10) are inclined relative to a central vertical line (13) towards the center of the pocket and merge at their upper ends into likewise inclined second partial surfaces (11), each of the second partial surfaces (11) ending in a third partial surface (12) which is parallel to the central vertical line (13).
- 5. A cylindrical window-type cage of claim 4 wherein the crossbars (4) are profiled.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 54 836 |
Dec 1997 |
DE |
|
Parent Case Info
This application is a 371 of PCT/EP98/06783 filed Oct. 26, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/EP98/06783 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/30048 |
6/17/1999 |
WO |
A |
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A |
5795080 |
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Aug 1998 |
A |
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