Hydraulic circuit for the control of forward and reverse shift c

192 clutches and power-stop control – Transmission control and clutch control – Common control

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Details

192 8719, 192109F, B60K 2014, F16D 2511

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active

047950170

ABSTRACT:
A hydraulic load power train control for reversible shifting with a pressure control device for the controlled build-up of a shift clutch pressure, a foot clutch valve for arbitrary control of the shift clutches, and a manually operable shift valve for shifting of the reversible power train. The foot clutch valve is connected parallel to the pressure control device. The pressure control device is formed by a changeover valve indirectly reversible by the shift valve by which the pressure controlled in the supply pressure line can be fed to two shift pressure lines which are connected to a valve device. At the same time, the valve device is so controlled by the foot clutch valve that the effective shift clutch pressure can be controlled without influencing the position of the changeover valve as a function of the actuation of the foot clutch. The hydraulic load power train control, on the one hand, makes possible, in the case of engaging or reversing of the shift clutches, a smooth transition from one gear to the other and, at the same time, a delay-free start in the shifting by actuation of the foot clutch.

REFERENCES:
patent: 3990553 (1976-11-01), Holzinger
patent: 4086994 (1978-05-01), Hirosawa et al.
patent: 4293059 (1981-10-01), Lucas
patent: 4452101 (1984-06-01), Fujioka
patent: 4492251 (1985-01-01), Blake
patent: 4598545 (1986-07-01), Harada

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