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:
May. 12, 1998
Filed:
Jun. 02, 1995
Kunihiko Morikawa, Hiratsuka, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A reduction gear device with a differential gear mechanism 4 for an electric vehicle, has a planetary gear type reduction gear mechanism 3 for transmitting a power from an electric motor 2 to right and left wheels 6, 6 of the vehicle through the differential gear mechanism 4. The reduction gear mechanism 3 is contained in a casing 1, while either of output shafts 4a, 4b of the differential gear mechanism 4 penetrates an output shaft 2c of the electric motor 2. The reduction gear mechanism 3 comprises a plural of complex pinions P each formed by integrating a first pinion P1 and a second pinion P2 having a less number of teeth than that of the first pinion P1, a planetary carrier C3 connected to the output shaft 2c of the electric motor 2 and rotatably supporting each of the complex pinions P at certain positions on a common circle, a first ring gear R1 fixed onto the casing 1 and engaged with the first pinion P1 of each of the complex pinions P, and a second ring gear R2 engaged with the second pinion P2 of each of the complex pinions P and serving to transmit the power from the electric motor 2 to the differential gear mechanism 4. When utilizing a small size motor of high speed type as the electric motor 2, the reduction gear device can reduce a size of the device and simplify a construction of the device, while increasing a reduction ratio thereof.