Power transmission unit for electric vehicle
US5435794A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1994 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Nov 7, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2001/2881
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A power transmission unit for an electric vehicle has a planetary-gear type speed reducer disposed between and connected to an electric motor and a driving wheel. The speed reducer has two planetary gear sets in which common pinions are engaged with a fixed first ring gear and a second ring gear acting as an output portion. The common pinions are supported to a common carrier acting as an input portion. The number of teeth of the second ring gear is set to be the same as the sum of a number of teeth of the first ring gear and a number of the common pinions, and the common pinions are located at equal distances. Therefore, the power transmission unit has a proper reduction gear ratio and a high-torque transmission characteristic which are required for an electric vehicle while the speed reducer is formed small in size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.