Steering system for turning multiple sets of steerable wheels
US9238481B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2014 |
| Grant date | Jan 19, 2016 |
| Priority date | — |
| Expiry date | Sep 5, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D7/044
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steering system for turning multiple sets of steerable wheels comprises three steering gears operatively connected to the steerable wheels. Each steering gear includes a control valve assembly and has an associated hydraulic motor. The first control valve assembly directs pressurized fluid to a first hydraulic motor and also directs pressurized fluid to a second hydraulic motor. The third control valve assembly directs pressurized fluid to a third hydraulic motor. When a torque below a predetermined value is applied to an output shaft of the second steering gear, the output shaft rotates in response to movement of the first control valve assembly, and the second control valve assembly remains in a neutral condition. When a torque above the predetermined value is applied to the output shaft of the second steering gear, the output shaft rotates to cause the second control valve assembly to assume an actuated condition to direct pressurized fluid away from the second hydraulic motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.