Emergency hydraulic control for continuously variable transmissi

Details Emergency hydraulic control for continuously variable transmissi Emergency hydraulic control for continuously variable transmissi

1998-09-08

2000-07-18

Battista, Mary Ann

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

474 28, 474 70, F16H 5900, F16H 6100, F16H 6300

Patent

active

060900008

ABSTRACT:
An emergency hydraulic control is provided for a transmission-dependent change of the hydraulic fluid pressures in a first and second hydraulic conical disk axial displacement of a continuously variable transmission, wherein a pump supplies at least the piston chamber of a second axial displacement, and a downstream-connected remote-controlled differential pressure regulator and at least one electro-magnetically actuable pressure relief valve limits the fluid pressure there, and feed from this supply the piston chamber of a first axial displacement, as well as a remote control having an opening function leading to the valve via the remote-control line, via a continuous way valve, whose opening movement into the flow-through position is controlled with the aid of the pressure present upstream of the valve, wherein at least the individual driving states such as forward running, reverse running and idling, can be selected by means of appropriate switching positions of an manual switching valve; and in case of an outage of the electronic control device, the driver has available, besides an "overdrive" gear, a fixed "low gear for starting of an incline, among others.

REFERENCES:
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patent: 5217412 (1993-06-01), Indlekofer et al.
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patent: 5787710 (1998-08-01), Baeuerle
patent: 5802847 (1998-09-01), Harnischfeger
patent: 5885178 (1999-03-01), Luh
patent: 5930997 (1999-08-01), Hayashi et al.
patent: 5937729 (1999-08-01), Spiess et al.
patent: 5944626 (1999-08-01), Spiess et al.

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