Hydraulic actuating system for a pair of concurrently operating clutches or brakes
US3938410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1973 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Sep 7, 1993 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/067
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Two concurrently operated hydraulic brakes of an automotive transmission, actuated in an intermediate-speed ("second gear") position, are filled under the control of a slide valve whose slider in a normal position admits fluid at high rate to both brakes and thereafter assumes an unstable throttling position in which the fluid pressure gradually builds up in them to a value causing an associated plunger to return the slider to normal. One of the brakes, which is only unidirectionally effective, remains actuated also upon an upshift into a high-speed position ("third gear") whereas the other, bidirectionally effective brake is released upon such upshift under the control of a shift valve which cuts off the fluid flow to the latter brake and establishes a drainage path therefor by passing the slide valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.