# US 8,783,134 B2 · Gearing

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- Number: US 8,783,134 B2
- Document ID: US8783134B2
- Status: Granted
- Kind: B2
- Application number: 13/073,572
- Filed: 2011-03-28
- Published: 2011-10-27
- Granted: 2014-07-22
- Earliest claimed: 2010-04-22
- Assignees: Wittenstein AG
- Applicants: Frank Michel; Michael Schmidt; Thomas Bayer; Heiko Schreiber; Lars Estermann
- Inventors: Frank Michel; Michael Schmidt; Thomas Bayer; Heiko Schreiber; Lars Estermann
- Web page: https://patentgrep.com/patent/US8783134B2

## CPC

- F16H 25/06: with intermediate members guided along tracks on both rotary members
- Y10T 74/19: Gearing
- F16H: GEARING
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Gearing (1), in particular single-stage gearing having a transmission ratio of greater than 1 to 10, having an internal gear (2) with an internal toothing (5), a first toothed ring with radially movable first teeth (6) for engaging into the internal toothing (5), a second toothed ring with radially movable second teeth (7) for engaging into the internal toothing (5), an inner shaft (21) on which is fastened a first cam disk (16) for the radial drive of the first teeth (6) and a second cam disk (17) for the radial drive of the second teeth (7), and a load dividing device for dividing a torque transmitted via the toothed rings between the toothed rings.

## Claims

### Claim 1

Gearing, in particular single-stage gearing having a transmission ratio of greater than 1 to 10, comprising
(a) an internal gear with an internal toothing,
(b) a first toothed ring with radially movable first teeth for engaging into the internal toothing,
(c) a second toothed ring with radially movable second teeth for engaging into the internal toothing,
(d) an inner shaft on which is fastened a first cam disk for the radial drive of the first teeth and a second cam disk for the radial drive of the second teeth,
(e) wherein the first teeth and the second teeth provide different degrees of play for dividing a torque transmitted via the toothed rings between the toothed rings, and
(f) wherein for different degrees of play of the first teeth and the second teeth, the cam disks have a different radius maxima, the first teeth and the second teeth have different lengths, and/or ring segments of the first toothed ring and of the second toothed ring have different radial thicknesses.

### Claim 2 (depends on 1)

Gearing according to claim 1, wherein at least one further toothed ring with further teeth and with at least one further cam disk, arranged on the inner shaft, for driving the further teeth.

### Claim 3 (depends on 1)

Gearing according to claim 1, wherein the teeth of the toothed rings are coupled by means of a tooth carrier.

### Claim 4 (depends on 1)

Gearing according to claim 1, wherein the length of the gearing in the axial direction of the inner shaft is greater than the outer diameter of the internal gear.

### Claim 5 (depends on 1)

Gearing according to claim 1, wherein the tooth carrier is coupled to a drive output shaft and the internal gear is coupled to a static counterbearing.

### Claim 6 (depends on 1)

Gearing according to claim 1, wherein the drive output shaft is coupled to a first end of the gearing and the counterbearing is coupled to a second end, which is opposite the first end, of the gearing.

### Claim 7 (depends on 1)

Gearing according to claim 1, wherein the tooth carrier and the internal gear have torsional rigidities which differ by less than a factor of four.

### Claim 8 (depends on 1)

Gearing according to claim 1, wherein the first cam disk (16) and the second cam disk each have at least one radius maximum in relation to an axis of rotation of the cam disks, the load dividing means comprising a twist angle of the radius maxima of the cam disks about the longitudinal axis of the inner shaft.

### Claim 9 (depends on 8)

Gearing according to claim 8, wherein in the twist angle of two adjacent cam disks is such that, in the unloaded state of the gearing, at least one of the toothed rings is eccentrically in engagement with the internal toothing.

### Claim 10 (depends on 8)

Gearing according to claim 8, wherein the twist angle of in each case two adjacent cam disks is at least substantially 45°, 60°, 90°, 120° or 180°.

### Claim 11 (depends on 9)

Gearing according to claim 9, wherein the twist angle of in each case two adjacent cam disks is at least substantially 45°, 60°, 90°, 120° or 180°.