Dual flow control for hydraulic clutch
US5518098A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1994 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | Dec 1, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2003/123
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic circuit for lubricating a tractor transmission and associated master clutch is disclosed wherein a high cooling flow of lubrication oil is delivered to the master clutch whenever the clutch is being modulated, but a normal lower oil flow is delivered to the clutch whenever the clutch is either disengaged or fully engaged. The hydraulic circuit includes a clutch lubrication control spool operatively associated with a pilot line sensing pressure from the hydraulic system controlling the application of the master clutch and a transmission brake that is engaged to stop the transmission when the master clutch is disengaged. The pilot line controls the positioning of the clutch lubrication control spool to shift the spool to a high flow position whenever less than full pressure is sensed in either the clutch applied or brake applied hydraulic lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.