Two-wheel/four-wheel automatic change-over device in automobile transfer apparatus
US4781266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1987 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Jan 30, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K17/344
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A two-wheel/four-wheel automatic change-over device in an automobile transfer apparatus is disclosed. In the transfer apparatus in which driving forces are transmitted directly from a transmission to front two wheels or rear two wheels and also transmitted through a wet-type multiple disc clutch to the other two wheels, the two-wheel/four-wheel change-over device has a change-over control unit for changing over from two-wheel drive to four-wheel drive. This unit automatically effects an engagement and a release of a wet-type multiple disc clutch in response to a signal of high speed travelling, a signal of slope travelling, a signal of quick acceleration travelling, a slip signal obtained from a relation between a real car speed and rotation of the wheels and a signal of a selector switch. In such a constitution, the wet-type multiple disc clutch is usually hydraulic-controlled so that it is differentiable in time of the four-wheel travelling. The direct connection type four-wheel drive or the two-wheel drive is performed in accordance with those signals with no time-lag. With this arrangement, a tight corner brake phenomenon can be avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.