Four-wheel drive vehicle with free wheels

Details Four-wheel drive vehicle with free wheels Four-wheel drive vehicle with free wheels

1998-03-19

2000-03-21

Hurley, Kevin

Motor vehicles

Having four wheels driven

Including separate mechanical assemblies for transmitting...

192 6941, B60K 17344

Patent

active

060391383

ABSTRACT:
A four-wheel drive vehicle with free wheels having free wheel hub mechanisms which utilize intake pipe negative pressure which is kept from being in the negative pressure state for a long time to diminish loading of the sealing members and improve the durability of the free wheel hub mechanisms. In the free wheel hub mechanism, a negative pressure change-over valve is disposed in an intake pipe negative pressure introducing passage to not only open or close the passage but also open it to the atmosphere. A timer is also provided to operate the negative pressure change-over valve so that the negative pressure introducing passage is opened to the atmosphere after lapse of a certain time from when a transfer switches over to two- or four-wheel drive until when the intake pipe negative pressure becomes constant.

REFERENCES:
patent: 5056634 (1991-10-01), Shiba et al.
patent: 5413201 (1995-05-01), Vidal
patent: 5871072 (1999-02-01), Itoh et al.

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