Damper pulley with leaf spring clutch

Patent metadata

Field	Value
Publication number	US-9856921-B2
Application number	US-201614993479-A
Country	US
Kind code	B2
Filing date	Jan 12, 2016
Priority date	Jan 12, 2015
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A damping pulley assembly is disclosed including a pulley with an outer flange and a fixed pulley plate. A floating pulley clutch plate is located within and engaged with the outer flange. Circumferentially spaced apart leaf springs are connected to a pulley hub. Second ends of the leaf springs are connected to a driven hub that includes a fixed hub plate. Floating clutch plates are located between the fixed pulley plate and the fixed hub plate, which are biased toward the fixed pulley plate by the leaf springs so that the clutch plates contact one another and/or the fixed hub or pulley plates.

First claim

What is claimed is:

1. A damping pulley assembly, comprising:
a pulley having a circumferentially extending body with an outer flange and an inner surface;
splines located on an inner side of the outer flange;
a fixed pulley plate extending radially inwardly from the inner side of the outer flange;
at least one floating pulley clutch plate having spline receiving notches engaged with the splines of the outer flange;
a pulley hub having a shaft opening;
a plurality of circumferentially spaced apart leaf springs, each having a first end and a second end, the first ends connected to the pulley hub and the second ends all extending in a first circumferential direction;
a driven hub having a radially outer surface, a fixed hub plate connected to the radially outer surface, and the seconds ends of the leaf springs are connected to the driven hub;
splines located on the radially outer surface of the driven hub; and
at least one floating hub clutch plate having spline receiving notches engaged with the splines of the driven hub, the at least one floating hub clutch plate being adjacent to the at least one floating pulley clutch plate, and all of the clutch plates being located between the fixed pulley plate and the fixed hub plate, wherein the fixed hub plate is biased toward the fixed pulley plate by the leaf springs so that the clutch plates contact at least one of one another, the fixed hub plate, or the fixed pulley plate.

2. The damping pulley assembly of claim 1 , further comprising a bearing located between the pulley and the pulley hub.

3. The damping pulley assembly of claim 2 , wherein the bearing is an axial and radial plain bearing.

4. The damping pulley assembly of claim 2 , wherein the pulley further comprises a radially extending flange connected to the outer flange and an inner flange having an inner surface that contacts a radial support surface of the bearing and the radially extending flange contacts an axial support surface of the bearing.

5. The damping pulley assembly of claim 1 , wherein there are a plurality of the floating hub clutch plates and a plurality of the floating pulley clutch plates interdigitated with one another located between the fixed pulley plate and the fixed hub plate.

6. The damping pulley assembly of claim 1 , wherein the clutch plates are made of at least one of an organic or cera-metallic friction material.

7. The damping pulley assembly of claim 1 , wherein the clutch plates are made of wet friction paper.

8. The damping pulley assembly of claim 1 , wherein the pulley hub has a radially extending flange, and the first ends of the leaf springs are riveted to the radially extending flange.

9. The damping pulley assembly of claim 1 , wherein the driven hub includes a radially inwardly extending flange, and the second ends of the leaf springs are riveted to the radially inwardly extending flange.

10. The damping pulley assembly of claim 1 , wherein the pulley has a belt engaging surface.

11. The damping pulley assembly of claim 1 , wherein the pulley is a deep drawn or stamped sheet metal part.

12. The damping pulley assembly of claim 1 , wherein the at least one floating pulley clutch plate is axially movable on the splines of the outer flange, and the at least one floating hub clutch plate is axially movable on the splines of the driven hub.

13. A method for rotational damping between a pulley and a shaft; comprising:
providing a damping pulley assembly including a pulley having a circumferentially extending body with an outer flange and an inner surface; splines located on an inner side of the outer flange; a fixed pulley plate extending radially inwardly from the inner side of the outer flange; at least one floating pulley clutch plate having spline receiving notches engaged with the splines of the outer flange; a pulley hub having a shaft opening and a radially extending flange; a plurality of circumferentially spaced apart leaf springs, each having a first end and a second end, the first ends connected to the radially extending flange and the second ends all extending in a first circumferential direction; a driven hub having an axially extending flange and a radially outer surface, a fixed hub plate connected to the radially outer surface; splines located on the radially outer surface of the driven hub; and at least one floating hub clutch plate having spline receiving notches engaged with the splines of the driven hub, the at least one floating hub clutch plate being adjacent to the at least one floating pulley clutch plate, and all of the clutch plates being located between the fixed pulley plate and the fixed hub plate;
rotating the pulley in a second circumferential direction, opposite the first circumferential direction, generating frictional forces between the fixed pulley plate, the at least one floating hub clutch plate, the at least one floating pulley clutch plate, and the fixed hub plate due to a bias of the leaf springs and a self-locking force generated by the rotation to transfer torque from the pulley to a shaft; and
allowing the pulley to rotate relative to the hub when the pulley rotates in the first circumferential direction.

14. The method of claim 13 , further comprising damping an angular torque in the first circumferential direction by slipping of at least one of the floating pulley clutch plate, the floating hub clutch plate, the fixed hub plate, or the fixed pulley plate relative to one another.

Assignees

• Schaeffler Technologies Ag

Inventors

• Berndt Eric

Classifications

• F16D7/027

  with multiple lamellae · CPC title

• F16D43/216

  with multiple lamellae · CPC title

• F16D3/12 Primary

  specially adapted for accumulation of energy to absorb shocks or vibration (by making use of fluid elements F16D3/80) · CPC title

• F16D13/76

  specially adapted to incorporate with other transmission parts, i.e. at least one of the clutch parts also having another function, e.g. being the disc of a pulley · CPC title

• F16D43/215

  with flat friction surfaces, e.g. discs · CPC title