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. 11, 1993
Filed:
May. 08, 1991
Hideki Sado, Zama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
The power transmission apparatus comprises a center differential gear, a first inner front wheel drive hub connected to the center differential gear, a second outer rear wheel drive hub also connected to the center differential gear coaxially with the first hub, a ring gear fixed to the second hub, a pinion gear coupled to a propeller shaft and in mesh with the ring gear at a gearing position above the axis of the ring gear, and in particular a lubrication structure including a rotary cover member fixed to the second hub and formed with plural oil stirring projections, an oil sump formed in an inner surface of an apparatus housing, and an oil passage formed in a pinion gear housing. Since the pinion gear is offset upward away from the axial height of the ring gear and further sufficiently lubricated by the lubrication structure, it is possible to dispose a steering rack under the pinion gear housing to improve the steering stability, by always keeping the front wheel alignment at toe-in state under any travelling conditions of a 4WD vehicle.