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:
Mar. 21, 1989
Filed:
May. 26, 1987
Hitoshi Azuma, Toyota, JP;
Kentaro Tomo, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A differential gear includes a rotatable case, pinions rotatably disposed in the case, a pair of side gears meshing with the pinions and disposed in the case, a first shaft supported rotatably about a rotary axis of the case and extending from one of side gears, a second shaft supported rotatably about the axis and extending from the other side gear in the opposite direction to the first shaft, a first driven gear provided in one of the first and second shafts, a first drive gear for rotating the driven gear to transmit driving force to the first and second shafts. A worm wheel fixed to the case, a worm meshing with the worm wheel and an electric motor are provided. The motor is controlled by a control device so as to maintain the difference between numbers of revolutions of the first and second shafts within a predetermined range.