Pressure modulating control valve for steering systems or the like
US4146102A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Jul 18, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87169
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Steering control valves selectively pressurize and vent fluid-actuated clutches and brakes of a crawler tractor steering system. Each control valve has an internal spool assembly, coupled to a foot pedal by a cable, which modulates brake pressure as a function of a pedal position and which establishes a maximum brake fluid pressure thereby eliminating the need for additional system components for such purposes. The control valves also provide a feedback fluid pressure, to resist pedal depression with a force proportional to the brake fluid pressure, enabling an operator to sense the degree of braking which is present at different degrees of pedal depression.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.