Branched infinitely-variable hydromechanical transmission for motor vehicles
US4895050A · kind A · utility
Inventor
Key dates
| Filing date | Jul 16, 1987 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Jul 16, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/0886
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Infinitely variable hydromechanical transmission with multiple power-transmission paths for motor vehicles having at least two gear-shift ranges, in which the infinitely variable control of the transmission is effected by a hydrostatic transmission. The transmission system manages with fewer hydrostatic units than heretofore. Its power-to-weight ratio and volume are lower. Its efficiency is increased six to ten times compared to a hydrostatic transmission. A hydrostatic package, a summation planetary gear train, and a second planetary gear train form the basic units which are constantly interconnected in any combination of transmissions. Depending on the range shifted, clutches connect the output shaft to one of the shafts of the summation planetary gear train or to a shaft of the second planetary gear train.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.