Disengageable pulley device

• US 20080230341A1
• Filed: 02/20/2008
• Published: 09/25/2008
• Est. Priority Date: 02/27/2007
• Status: Active Grant

• Current Assignee: ABet SKF
• Original Assignee: ABet SKF
• Inventors: Gaborel, Jean-Philippe, Barraud, Pierre-Julien, Hingouet, Gwenael
• Granted Patent: US 8,172,056 B2
• Time in Patent Office: Days
• US Class Current: 192/45
• CPC Class Codes: F16C 19/08 with two or more rows of balls
• CPC Class Codes: F16C 2361/63 Gears with belts and pulleys
• 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: F16D 41/069 the intermediate members wedging by pivoting or rocking, e.g. sprags F16D41/061 takes precedence
• CPC Class Codes: F16D 41/07 between two cylindrical surfaces
• CPC Class Codes: F16H 55/36 Pulleys with features essential for adjustment F16H55/52

Abstract

Disengageable pulley device comprising a pulley mounted on a shaft by means of a rolling bearing and of a freewheel, the pulley comprising a rim mounted on the periphery of a one-piece outer race of substantially tubular shape comprising, on an inner surface, at least one raceway for rolling elements and at least one contact seat of cylindrical revolution for lock-up elements of the freewheel, a one-piece inner race forming a torque transmission shaft and including, on an outer surface coming opposite the outer race, at least one raceway for the rolling elements and at least one contact seat of cylindrical revolution for the lock-up elements of the freewheel.

Claims

1. A disengageable pulley device comprising:

a pulley mounted on a shaft by means of a rolling bearing and a freewheel, the pulley comprising a rim mounted on the periphery of a one-piece outer race of substantially tubular shape, the rim comprising, on an inner surface, at least one raceway for rolling elements and at least one contact seat of cylindrical revolution for lock-up elements of the freewheel;

a one-piece inner race forming a torque transmission shaft and including, on an outer surface coming opposite the outer race, at least one raceway for the rolling elements and at least one contact seat of cylindrical revolution for the lock-up elements of the freewheel;

the bearing comprising two rows of rolling elements, one being arranged between the freewheel and the other row of rolling elements.

2. The device of claim 1, wherein the axial width of the outer race is greater than the axial width of the active surface of the rim of the pulley.

3. The device of claim 1, wherein the rim of the pulley is arranged axially on that side of the outer race where the raceway or raceways are situated.

4. The device of claim 1, wherein the rolling elements comprise balls, and/or the lock-up elements comprise cams.

5. The device of claim 1, wherein the lock-up elements comprise engaging cams.

6. The device of claim 1, wherein the inner race has a cylindrical outer profile with a substantially uniform diameter outside the raceways.

7. The device of claim 1, wherein the outer race has a cylindrical outer profile.

8. The device of claim 1, wherein the inner raceways are formed directly on the shaft.

9. The device of claim 1, wherein the rolling bearing and the active outer surface of the rim are symmetrical with respect to a common radial plane.

10. The device of claim 1, further comprising a seal arranged between the freewheel and the rolling bearing.

11. The device of claim 10, wherein the freewheel comprises a lubricant which differs from the lubricant of the rolling bearing.

12. An alternator provided with a rotating part comprising a device according to claim 1.