# US 11,079,001 B2 · Gear for a transmission with inclined sidewalls

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- Number: US 11,079,001 B2
- Document ID: US11079001B2
- Status: Granted
- Kind: B2
- Application number: 16/484,625
- Filed: 2018-02-14
- Published: 2020-02-06
- Granted: 2021-08-03
- Earliest claimed: 2017-02-15
- Assignees: Advanced Electric Machines Group Limited
- Applicants: Advanced Electric Machines Group Limited
- Inventors: Andrew Steven
- Web page: https://patentgrep.com/patent/US11079001B2

## CPC

- F16H 55/17: Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30)
- F16H 48/40: characterised by features of the rotating cases
- F16H 2048/385: {of the ring or crown gear}
- F16H: GEARING

## Abstract

A gear for use in a transmission system. The gear comprises an outer annular element having gear teeth on a radially outer surface thereof and an inner support element arranged coaxially with the outer annular element. The gear further comprises first and second opposing side walls, each side wall extending from the outer annular element to the inner support element to form an annular space. At least one of the first and second side walls extends from the outer annular element at an angle greater than 0 degrees with respect to a direction perpendicular to the rotational axis of the gear.

## Claims

### Claim 1

A gear for use in a transmission system, the gear comprising:
an outer annular element having gear teeth arranged helically on a radially outer surface thereof;
an inner support element arranged coaxially with the outer annular element; and
first and second opposing side walls, each side wall extending from the outer annular element to the inner support element to form an annular space,
wherein both of the first and second side walls extend from the outer annular element at an angle greater than 0 degrees with respect to a direction perpendicular to the rotational axis of the gear, and
wherein each of the first and second side walls are constantly inclined between the outer annular element and the inner support element, and each of the first and second side walls are rigidly connected to or integral with each of the outer annular element and the inner support element such that the first and second side walls are configured to resist gear loading forces in the axial direction.

### Claim 2 (depends on 1)

The gear according to claim 1, wherein at least one of the first and second side walls extends from the outer annular element at an angle between 10 and 50 degrees with respect to the direction perpendicular to the rotational axis of the gear.

### Claim 3 (depends on 1)

The gear according to claim 1, wherein an angle of inclination of each of the first and second side walls is constant along their respective lengths between the outer annular element and the inner support element.

### Claim 4 (depends on 1)

The gear according to claim 1, wherein the first and second side walls have equal and opposite angles of inclination.

### Claim 5 (depends on 1)

The gear according to claim 1, wherein at least one of the first and second side walls is frusto-conical in shape.

### Claim 6 (depends on 1)

The gear according to claim 1, wherein an axial length of the inner support element is greater than an axial length of the outer annular element.

### Claim 7 (depends on 1)

The gear according to claim 1, wherein the inner support element is an axially extending shaft.

### Claim 8 (depends on 1)

The gear according to claim 1, wherein the inner support element comprises a differential gear assembly.

### Claim 9 (depends on 1)

The gear according to claim 1, wherein the first and second side walls have a wall thickness between 2 mm and 6 mm.

### Claim 10 (depends on 1)

A transmission system comprising the gear of claim 1.