Tractor with draft load control system
US4160485A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1977 |
| Grant date | Jul 10, 1979 |
| Priority date | — |
| Expiry date | Dec 23, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B63/112
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A tractor draft load monitoring system responsive to tractor and associated implement load changes. The system is particularly adapted for a tractor having an engine/transmission power unit coupled to its drive shaft. The power unit is mounted on the frame by resilient mounts that permit measurable angular displacement of the power unit relative to the frame about the drive shaft axis in reaction to changes in the drive shaft torque. The working depth of the implement, which may be tractor mounted, semi-mounted or a pull type implement, is raised or lowered by a hydraulic lift system that is controlled by a control valve assembly connected to a source of fluid under pressure. Interposed between the power unit and the control valve assembly is a transmission cable (Bowden wire type) and lever system that is operative to transmit angular displacement of the power unit to an actuating member of the control valve assembly to cause hydraulic actuation of the hydraulic lift device to change the working depth of the implement to compensate for changes in its draft load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.