Limiting/switching device for four wheel drive vehicle
US4862768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1986 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Dec 31, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K17/3462
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Provided is a power transmission device for four-wheel drive vehicles of both the full-time type and part-time types, wherein a wet multiple-disc clutch is mounted in a ring gear covering the front-wheel differential gear and arranged coaxially with the differential gear. The wet multiple-disc type clutch is engaged by means of a hydraulic actuator in which a plurality of pistons are arranged in series. Hydraulic pressure is fed into oil chambers formed by the pistons through individual or common oil passages. The wet multiple-clutch constitutes a differential motion limiting device for stopping or limiting the differential motion of a center differential gear for the full-time four wheel drive, or constitutes a rear wheel drive switching unit for engaging and disengaging the power transmission between the ring gear mount casing and the transfer unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.