Transmission with a first-stage hydrostatic mode and two hydromechanical stages
US4363247A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1979 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Nov 19, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/0886
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power transmission having a single Ravigneau-type planetary assembly, having a single carrier with two sets of planet gears, two sun gears, and one ring gear. A first sun gear is connected by a first set of planet gears to the ring gear; the ring gear itself is directly and rigidly connected to an output shaft. A speed-varying module is connected in driving relation to the input shaft and in driving relationship to the first sun gear. The speed varying means may comprise a pair of hydraulic units hydraulically interconnected so that one serves as a pump while the other serves as a motor and vice versa, one of the units having a variable stroke and being connected in driving relation to the input shaft, the other unit, which may have a fixed stroke, being connected in driving relation to the first sun gear. The input shaft is also connectable by a first clutch to the carrier and by a second clutch to the second sun gear. A brake grounds the carrier in the first range and in reverse and causes drive to be delivered to the output through the ring gear in a hydrostatic mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.