Drive system with two hydrostatic gears
US4756156A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Oct 3, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/42
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A drive system having two hydrostatic gears (1, 2) driven by a common driving motor or by a plurality of driving motors having a fixed speed ratio, each having a pump (5, 6) and a hydraulic motor (7, 8) and in which the delivery or intake volume setting of the pumps (5, 6) and/or the hydraulic motors (7, 8) is performed by hydraulic servomechanisms (13, 14) of which the control pressures in the control pressure lines (23, 24) can be varied as desired either independently or together by means of pressure indicating valves (26) connected to each of the gears (1, 2) and supplied by an auxiliary source of pressure (9, 10) is arranged so that, at least on starting, the outputs of the gears (1, 2) are as nearly as possible equal. This is done by means of an adjustable differential pressure valve (41) connected to the control pressure lines (23, 24, 25) which is set to compensate for differences in output values of the gears (1, 2) arising from departures from the intended values by a corresponding pressure change in at least one of the control pressure lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.