Hydrostatic transmission having a control and regulating device for adjusting the driving torque with superimposed output power limit regulation
US4802336A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1981 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Nov 9, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/475
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
There is disclosed an hydrostatic transmission having a control and regulating device for adjusting the driving torque with superimposed output power limit regulation, the transmission comprising a drive unit comprising an hydraulic pump having a variable output, and an hydraulic motor arranged to be operated by the hydraulic pump; a servo-adjusting device arranged to control the output of the hydraulic pump in order to adjust the working pressure in the transmission, said device comprising a servo piston arranged for two-way adjustment of the hydraulic pump in two directions, and a control valve arranged to subject the servo-piston to an adjusting pressure so that the piston can adjust the operation of the hydraulic pump; a servo-valve spool provided in said control valve and arranged, in dependence upon the desired direction of adjustment of the hydraulic pump, to be subjected on the one hand to a control pressure and on the other hand to the working pressure prevailing in the transmission or a regulating pressure proportional to the working pressure; an arbitrarily variable operating device comprising a pressure regulator for adjusting said control pressure from a constant suppl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.