# US 10,480,625 B2 · Emergency steering system for vehicle

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- Number: US 10,480,625 B2
- Document ID: US10480625B2
- Status: Granted
- Kind: B2
- Application number: 15/686,346
- Filed: 2017-08-25
- Published: 2017-12-14
- Granted: 2019-11-19
- Earliest claimed: 2016-06-12
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Chi Woo Lee
- Web page: https://patentgrep.com/patent/US10480625B2

## CPC

- F16H 3/666: {with intermeshing orbital gears (F16H3/663 takes precedence)}
- B62D 1/10: Hubs; Connecting hubs to steering columns, e.g. adjustable (B62D1/11 takes precedence)
- B62D 1/166: {Means changing the transfer ratio between steering wheel and steering gear}
- B62D 3/02: mechanical
- B62D 5/0403: {characterised by constructional features, e.g. common housing for motor and gear box}
- B62D 5/30: Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means
- B60Y 2306/13: Failsafe arrangements
- B60Y 2400/83: Steering input members
- B62D 5/008: {Changing the transfer ratio between the steering wheel and the steering gear by variable supply of energy, e.g. by using a superposition gear}
- F16H 2200/2005: with one sets of orbital gears
- F16H 2200/2007: with two sets of orbital gears
- F16H: GEARING
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY

## Abstract

An emergency steering system for a vehicle, may include a planetary gear mounted in an inlet space of a gear box for a steering apparatus so that the planetary gear is ordinarily operated at a gear ratio of 1:1 and has an increased gear ratio in the event of failure of a main steering device; and a gear ratio increasing device mounted to an upper plate portion of the gear box to increase the gear ratio of the planetary gear.

## Claims

### Claim 1

An emergency steering system for a vehicle, comprising:
a planetary gear apparatus mounted in an inlet space of a gear box for a steering apparatus wherein the planetary gear apparatus is operated at a gear ratio of 1:1 in a condition of normal operation and has an increased gear ratio in an event of failure of a main steering device; and
a gear ratio increasing device mounted to an upper plate portion of the gear box to increase the gear ratio of the planetary gear apparatus,
wherein the planetary goy apparatus includes:
a small sun gear connected to a steering wheel;
a plurality of first pinions engaged with the small sun gear;
a large sun gear coaxially disposed behind the small sun gear;
a plurality of second pinions engaged with the respective first pinions and the large sun gear;
a ring gear inscribed and engaged with the second pinions; and
a carrier connected to rotation centers of the first and second pinions while being restrainedly connected to the large sun gear, the carrier being mounted to the upper plate portion of the gear box, and
wherein the large sun gear is separated from the carrier by operation of the gear ratio increasing device in the event of failure of the main steering device.

### Claim 2 (depends on 1)

The emergency steering system of claim 1, wherein the carrier includes first shafts inserted through the centers of the respective first pinions and through a body of the large sun gear, second shafts inserted through the centers of the respective second pinions, connection links, each of which has a first end portion connected to an associated one of the first shafts by a hinge and a second end portion connected to an associated one of the second shafts by a hinge, and a stationary link interconnecting the connection links.

### Claim 3 (depends on 2)

The emergency steering system of claim 2, wherein the gear ratio increasing device includes:
a controller configured to detect the event of failure of the main steering device; and
an actuator mounted to the upper plate portion of the gear box wherein the large sun gear of the planetary gear apparatus is pushed and separated from the first shafts of the carrier in response to a command signal of the controller.

### Claim 4 (depends on 1)

The emergency steering system of claim 1, wherein the large sun gear is maintained in a state in which the large sun gear is engaged with the second pinions even though the large sun gear is separated from the carrier.

### Claim 5 (depends on 1)

The emergency steering system of claim 1, wherein the gear ratio increasing device includes:
a controller configured to detect the event of failure of the main steering device; and
an actuator mounted to the upper plate portion of the gear box wherein the large sun gear of the planetary gear apparatus is pushed and separated from first shafts of the carrier in response to a command signal of the controller.

### Claim 6 (depends on 5)

The emergency steering system of claim 5, wherein a pusher is mounted to a piston of the actuator to be maintained in a state in which the pusher is distanced from a front surface of the large sun gear in the condition of normal operation and to push the large sun gear by moving forward together with the piston in the event of failure of the main steering device.