# US 12,007,010 B2 · Gear wheel of a transmission

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- Number: US 12,007,010 B2
- Document ID: US12007010B2
- Status: Granted
- Kind: B2
- Application number: 17/859,498
- Filed: 2022-07-07
- Published: 2023-02-23
- Granted: 2024-06-11
- Earliest claimed: 2021-08-20
- Assignees: Rolls-Royce Deutschland Ltd & Co KG
- Applicants: Rolls-Royce Deutschland Ltd & Co KG
- Inventors: Michael Gräber
- Web page: https://patentgrep.com/patent/US12007010B2

## CPC

- F16H 55/06: Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
- F02C 7/36: Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user ({F02C3/107 - F02C3/13 and} F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H)
- F16H 55/17: Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30)
- F05D 2220/323: for aircraft propulsion, e.g. jet engines
- F05D 2260/4031: as in toothed gearing
- F16H: GEARING
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A gear wheel of a transmission, in particular of a transmission of a gas turbine engine is described, which is designed with a groove which extends in the circumferential direction on the outer periphery of a base body of the gear wheel and in which fibers running at least in the circumferential direction are arranged. The fibers surround the base body in the circumferential direction, wherein the fibers at least partially support the operating loads on the gear wheel only on a breakage of the base body.

## Claims

### Claim 1

A gear wheel of a transmission, comprising:
a base body;
a groove which extends in a circumferential direction on an outer periphery of the base body and in which fibers running at least in a circumferential direction are arranged, surrounding the base body in the circumferential direction;
wherein the fibers provide two operating modes:
in a first mode, in a normal operation of the gear wheel, the fibers do not support operating loads of the gear wheel or contribute to the strength of the gear wheel; and
in only a second mode, upon breakage of the gear wheel, the fibers at least partially support operating loads acting on the gear wheel.

### Claim 2 (depends on 1)

The gear wheel according to claim 1, wherein a region of the base body of the gear wheel, in which the at least one groove is provided, is arranged next to a toothing region of the gear wheel in an axial direction.

### Claim 3 (depends on 1)

The gear wheel according to claim 1, wherein the fibers are arranged in the groove in the base body such that a separation of the fibers from the gear wheel caused by centrifugal force during a rotational movement of the gear wheel is prevented.

### Claim 4 (depends on 1)

The gear wheel according to claim 1, wherein the fibers are embedded in a matrix, and/or in an additional layer of a textile or a fabric.

### Claim 5 (depends on 1)

The gear wheel according to claim 1, wherein the fibers are aramide fibers, silicon carbide fibers and/or carbon fibers.

### Claim 6 (depends on 1)

The gear wheel according to claim 1, wherein the fibers in the groove are wound in a circumferential direction of the gear wheel.

### Claim 7 (depends on 1)

The gear wheel according to claim 1, wherein the fibers are arranged in the groove in the form of strips and/or as a fiber bundle.

### Claim 8 (depends on 1)

The gear wheel according to claim 1, wherein a winding direction of the fibers is the same as a rotation direction of the gear wheel if the gear wheel is always operated in the same rotation direction.

### Claim 9 (depends on 1)

The gear wheel according to claim 1, wherein a length of the fibers is greater than a circumference of the base body.

### Claim 10 (depends on 1)

The gear wheel according to claim 1, wherein the gear wheel is a gear wheel of a transmission of a gas turbine engine of an aircraft.

### Claim 11 (depends on 4)

The gear wheel according to claim 4, wherein the matrix is an epoxy matrix.

### Claim 12 (depends on 1)

The gear wheel according to claim 1, wherein there is no fixed connection between the fibers and the gear wheel.