Auxiliary hydrostatic drive system
US4244184A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1979 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | Aug 23, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/456
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The steerable wheels of a hydraulically driven vehicle are provided with fixed displacement type auxiliary motors which are connected in parallel both with each other and with the motor which powers the main drive wheels. A selector valve permits the motors for the steerable wheels to be optionally connected and disconnected from the reversible, variable displacement main pump. Flow dividers in the hydraulic lines limit the maximum flow of fluid to any one auxiliary drive motor. To prevent large power losses when the steerable wheel assist mode is not being utilized, the selector valves are placed in close proximity to each fixed displacement motor. This allows the motors to circulate large quantities of fluid around a closed loop at minimum pressure drop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.