Hydromechanical transmission with hydrodynamic drive
US4134310A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1977 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Apr 15, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/106
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
This transmission has a first planetary gear assembly having first input means connected to an input shaft, first output means, and first reaction means, and a second planetary gear assembly having second input means connected to the first input means, second output means, and second reaction means connected directly to the first reaction means by a reaction shaft. First clutch means, when engaged, connect the first output means to an output shaft in a high driving range. A hydrodynamic drive is used; for example, a torque converter, which may or may not have a stationary case, has a pump connected to the second output means, a stator grounded by an overrunning clutch to the case, and a turbine connected to an output member, and may be used in a starting phase. Alternatively, a fluid coupling or other type of hydrodynamic drive may be used. Second clutch means, when engaged, for connecting the output member to the output shaft in a low driving range. A variable-displacement hydraulic unit is mechanically connected to the input shaft, and a fixed-displacement hydraulic unit is mechanically connected to the reaction shaft. The hydraulic units are hydraulically connected together so t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.