Power transmission system in vehicle

Details Power transmission system in vehicle Power transmission system in vehicle

2005-02-15

2005-02-15

Pang, Roger (Department: 3681)

Planetary gear transmission systems or components

Nonplanetary variable speed or direction transmission...

Interrelated control of in series transmissions

C475S210000, C477S044000

Reexamination Certificate

active

06855084

ABSTRACT:
In a power transmission system in a vehicle including a continuously variable gear path and a multi-stage gear path, a difference between gear ratios at the start of forward travel and at the start of backward travel is minimized, while using a single-pinion type planetary gear mechanism. The continuously variable gear path includes a forward/backward travel switching mechanism comprising a single-pinion type planetary gear mechanism, and a belt-type continuously variable transmission. A multi-stage gear path comprising gears is set at a gear ratio closer to a LOW side from that of the belt-type continuously variable transmission. Thus, when the forward traveling and the backward traveling are switched over from one to another, it is unnecessary to suddenly change the gear ratio of the belt-type continuously variable transmission, which can contribute to an improvement in durability of belt-type continuously variable transmission.

REFERENCES:
patent: 5895335 (1999-04-01), Haka
patent: 5944628 (1999-08-01), Lee
patent: 6379278 (2002-04-01), Eguchi et al.
patent: 6500090 (2002-12-01), Kanda et al.
patent: 63-14228 (1988-03-01), None
patent: WO009221896 (1992-12-01), None

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