Hydromechanical transmission with two planetary assemblies that are clutchable to both the input and output shafts
US4134311A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1977 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Jul 7, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/107
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power transmission having two planetary assemblies, each having its own carrier and its own planet, sun, and ring gears. A speed-varying module is connected in driving relation to the input shaft and in driving relationship to the two sun gears, which are connected together. 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 sun gears. A brake grounds the first carrier in the first range and in reverse and causes drive to be delivered to the output shaft through the first ring gear in a hydrostatic mode, the first ring gear being rigidly connected to the output shaft. The input shaft also is clutchable to either the carrier or the ring gear of the second planetary assembly. The output shaft is also clutchable to the carrier of the second planetary assembly when the input is clutched to the ring gear of the second planetary assembly, and is clutchable to the ring gear of the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.