PIN FOR GUIDING A GEAR WHEEL, AND PLANETARY TRANSMISSION CONTAINING THE SAME

• US 20140080658A1
• Filed: 09/10/2013
• Published: 03/20/2014
• Est. Priority Date: 09/10/2012
• Status: Active Grant

• Current Assignee: ABet SKF
• Original Assignee: ABet SKF
• Inventors: Edelmann, Ludwig, Namyslo, Dominic
• Granted Patent: US 9,194,479 B2
• Time in Patent Office: Days
• US Class Current: 475/331
• CPC Class Codes: F16C 17/04 for axial load only
• CPC Class Codes: F16C 19/28 with two or more rows of rollers
• CPC Class Codes: F16C 19/48 with two or more rows of needles
• CPC Class Codes: F16C 21/00 Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement F16C17/24, F16C19/52 take precedence
• CPC Class Codes: F16C 2361/61 Toothed gear systems, e.g. support of pinion shafts
• CPC Class Codes: F16C 25/06 Ball or roller bearings
• CPC Class Codes: F16C 33/581 integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels
• CPC Class Codes: F16H 2057/0221 Axial adjustment
• CPC Class Codes: F16H 2057/085 Bearings for orbital gears
• CPC Class Codes: F16H 57/0031 with gearing elements rotatable supported on the shaft F16H57/021 takes precedence
• CPC Class Codes: F16H 57/021 Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
• CPC Class Codes: F16H 57/08 of gearings with members having orbital motion

Abstract

A pin for guiding a gear has a substantially cylindrical outer surface section, wherein the outer surface section comprises a substantially cylindrical rolling surface section, which is aligned and formed so as to make possible the guiding of the gear. The outer surface section further has a groove, which is formed so as to accommodate a retaining ring, wherein the groove is disposed with respect to the rolling surface section so as to make possible a guiding, directly or indirectly via the retaining ring, of a rolling-element assembly along the axial direction of the pin. In this way it is possible to provide a guiding of a gear wherein a small tolerance chain is implemented with respect to the axial position.

Claims

1. A pin for guiding a gear wheel, having the following features:

a substantially cylindrical outer surface section, wherein the outer surface section comprises an at least substantially cylindrical rolling surface section which is configured to support the gear wheel; and

wherein the outer surface section further contains a groove, which is formed in order to accommodate a retaining ring, and

the groove is disposed with respect to the rolling surface section so as to make possible a guiding directly, or indirectly via the retaining ring, of a rolling-element assembly on the rolling surface section along an axial direction of the pin.

2. The pin according to claim 1, which comprises the retaining ring as well as a thrust washer, wherein the thrust washer is in abutment with the retaining ring, and is formed so as to at least partially limit movement of the rolling-element assembly along the axial direction by contact with the thrust washer.

3. The pin according to claim 2, wherein the thrust washer is disposed on a side of the groove that is opposite of the rolling-element assembly.

4. The pin according to claim 2, further comprising a shoulder disposed on an end side of the rolling surface section opposite of the groove and is formed so as to at least partially limit movement of the rolling-element assembly along the axial direction by contact with the shoulder.

5. The pin according to claim 4, wherein the gear wheel has a clearance between the shoulder and the thrust washer that is at least 0.2 mm and at most 0.8 mm.

6. The pin according to claim 2, further comprising the rolling-element assembly, which in turn comprises:

at least a first row of rolling elements disposed around a circumferential direction of the pin and

a cage that guides the rolling elements in the axial direction and/or in a tangential direction.

7. The pin according to claim 6, wherein the cage is formed so as to guide the rolling-element assembly in at least the axial direction.

8. The pin according to claim 7, wherein at least 50% of a width of the groove is covered by the cage.

9. The pin according to claim 8, wherein the cage has a clearance that is at least 0.2 mm and at most 0.8 mm.

10. The pin according to claim 9, wherein the rolling-element assembly further comprises:

at least a second row of rolling elements disposed around the circumferential direction of the pin and axially adjacent to the first row of rolling elements, and

wherein the cage guide the rolling elements of both the first and second rows in the axial direction and/or in the tangential direction.

13. The pin according to claim 3, further comprising a shoulder disposed on an end side of the rolling surface section opposite of the groove and is formed so as to at least partially limit movement of the rolling-element assembly along the axial direction by by contact with the shoulder.

14. The pin according to claim 4, further comprising the rolling-element assembly, which in turn comprises:

at least a first row of rolling elements disposed around a circumferential direction of the pin and

a cage that guides the rolling elements in the axial direction and/or in a tangential direction.

15. The pin according to claim 6, wherein the rolling-element assembly further comprises:

at least a second row of rolling elements disposed around the circumferential direction of the pin and axially adjacent to the first row of rolling elements, and

wherein the cage guide the rolling elements of both the first and second rows in the axial direction and/or in the tangential direction.

16. The pin according to claim 15, wherein the rolling elements comprise needle-shaped, cylindrical, roller-shaped, barrel-shaped, and/or ball-shaped rolling elements.

17. The pin according to claim 16, wherein the cage comprises a metallic material and/or a plastic.

18. A planetary transmission including a plurality of planetary gears, wherein the planetary gears of the plurality of planetary gears are each guided on a planet carrier via a pin according to claim 1.

20. A planetary transmission including a plurality of planetary gears, wherein the planetary gears of the plurality of planetary gears are each guided on a planet carrier by a pin according to claim 17.

11. The pin according to claim 11, wherein the rolling elements comprise needle-shaped, cylindrical, roller-shaped, barrel-shaped and/or ball-shaped rolling elements.

12. The pin according to claim 12, wherein the cage comprises a metallic material and/or a plastic.

19. A planetary transmission including a plurality of planetary gears, wherein the planetary gears of the plurality of planetary gears are each guided on a planet carrier by a pin according to claim 12.