Auxiliary hydrostatic front wheel drive system
US4069886A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1976 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Jul 15, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/452
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A vehicle such as a motor grader includes a hydrostatic auxiliary front wheel drive system which utilizes implement system pressurized fluid flow to drive a pair of fixed displacement hydraulic motors, such motors being drivingly connected to cause rotation of the front wheels. A pilot operated series-parallel valve in combination with a flow divider allows the motors to be driven in series or in parallel. A directional control valve is selectively responsive to operator control, and clutch actuation is accomplished automatically by directing a controlled portion of system fluid to such clutches to overcome the normal spring bias thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.