# US 2009/0260945 A1 · Prestressing unit

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- Number: US 2009/0260945 A1
- Document ID: US20090260945A1
- Status: Published application
- Kind: A1
- Application number: 12/423,327
- Filed: 2009-04-14
- Published: 2009-10-22
- Earliest claimed: 2008-04-15
- Assignees: Schaeffler KG
- Inventors: Harald Martini; Fritz Wiesinger
- Web page: https://patentgrep.com/patent/US20090260945A1

## CPC

- F16H 25/186: {with reciprocation along the axis of oscillation}
- F16D 23/14: Clutch-actuating sleeves {or bearings}; Actuating members directly connected to clutch-actuating sleeves {or bearings}
- F16D 2023/123: {Clutch actuation by cams, ramps or ball-screw mechanisms}
- Y10T 74/18304: Axial cam
- Y10T 74/2101: Cams
- F16H: GEARING
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A prestressing unit which has a first ramp disk and a second ramp disk. Ramp contours are formed in one side of an annular face of the ramp disks. In the prestressing unit, the rolling bodies ascend and/or descend on the ramp contours as a result of rotational pivoting of one of the ramp disks in relation to the other ramp disk about an axis. The ramp contours are each formed as a single-part running face for the rolling bodies. The running face is inclined with respect to the axis.

## Claims

### Claim 1

A prestressing unit having a first ramp disk and a second ramp disk, a plurality of ramp contours are formed in one side of an annular face of the first ramp disk and the second ramp disk rolling bodies are arranged between the ramp contours of the first ramp disk and the second ramp disk in such a way that, in the prestressing unit, the rolling bodies rise and/or fall on the ramp contours as a result of rotational pivoting of at least one ramp disk in relation to the other ramp disk about an axis wherein single-piece running faces are formed in the ramp contours for the rolling bodies, and the running faces are inclined with respect to the axis.

### Claim 2 (depends on 1)

The prestressing unit according to claim 1, wherein the running faces have a constant inclination with respect to the axis.

### Claim 3 (depends on 1)

The prestressing unit according to claim 1, wherein the running faces have a variable inclination with respect to the axis.

### Claim 4 (depends on 1)

The prestressing according to claim 1, wherein the running faces have an initial contact point and an end contact point for the rolling bodies, and an end stop is formed at the end contact point for the rolling bodies.

### Claim 5 (depends on 4)

The prestressing unit according to claim 4, wherein the end stop is formed at the lowest point of a raceway.

### Claim 6 (depends on 1)

The prestressing unit according to claim 1, wherein the prestressing unit comprises a cage for holding the rolling bodies, and the second ramp disk holds at least the cage together with the rolling bodies and the first ramp disk against one another in a positively locking fashion.

### Claim 7 (depends on 6)

The prestressing unit according to claim 6, wherein the cage for holding the rolling bodies can be rotatably pivoted with respect to the first ramp disk or the second ramp disk.

### Claim 8 (depends on 1)

The prestressing unit according to claim 1, wherein the first ramp disk is connected to an actuating element by means of which the first ramp disk can be rotatably pivoted.

### Claim 9 (depends on 1)

The prestressing unit according to claim 1, wherein three rolling bodies are arranged and distributed uniformly between three ramp contours formed on the first ramp disk and the second ramp disk.

### Claim 10 (depends on 1)

The prestressing unit according to claim 1, wherein the first ramp disk and the second ramp disk are cold worked components made from a sheet metal blank, and cold forming of the sheet metal blank forms the ramp contours, the running faces with an initial contact point, an end contact point and an end stop for the rolling bodies.

### Claim 11 (depends on 10)

The prestresing unit according to claim 10, wherein the components of the ramp contours are hardened at least on the running surface for the rolling bodies such that the components are suitable for rolling.

### Claim 12 (depends on 1)

The prestresing unit according to claim 1, wherein the rolling bodies are embodied as rollers.

### Claim 13 (depends on 1)

The prestresing unit according to claim 1, wherein the rolling bodies are embodied as truncated cones.

### Claim 14 (depends on 1)

The prestressing unit according to claim 1, wherein components of the prestressing unit are combined to form a pre-mounted unit.

### Claim 15 (depends on 14)

The prestressing unit according to claim 14 wherein the components of the prestressing unit comprise, as a pre-mounted unit, at least the first ramp disk and the second ramp disk and a cage between the first ramp disk and the second ramp disk.