The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1995
Filed:
Nov. 07, 1994
Haruhito Mori, Kawasaki, JP;
Kunihiko Morikawa, Hiratsuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
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.