Hydraulic control system
US4289221A · kind A · utility
13Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1978 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Nov 17, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/70217
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for use with dependent hydraulic clutches in which an accumulator valve (22) is used to provide improved engagement characteristics for the hydraulic clutch assembly (10). The accumulator valve includes back-to-back pistons (96, 100) separated by an outer spring (102) and an inner spring (104). Movement of the pistons provides an initial fast fill of the clutches, followed by a period of cushioned engagement, and then complete engagement. The dual spring arrangement provides two distinct periods of cushioned engagement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.