Planetary gear transmission systems or components – Planetary gearing or element – Nonplanetary gearing combined with planetary
Patent
1994-11-07
1995-07-25
Koczo, Michael
Planetary gear transmission systems or components
Planetary gearing or element
Nonplanetary gearing combined with planetary
475338, 475341, F16H 132
Patent
active
054357942
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.
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"Hatsumei", (The Invention), vol. 89, 1992 pp. 86-89.
Mori Haruhito
Morikawa Kunihiko
Koczo Michael
Nissan Motor Co,. Ltd.
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