Gearbox with electronically-controlled hydraulic clutches, for a

Details Gearbox with electronically-controlled hydraulic clutches, for a Gearbox with electronically-controlled hydraulic clutches, for a

1988-04-01

1989-10-17

Diehl, Dwight G.

Machine element or mechanism

Gearing

Interchangeably locked

74740, F16H 548

Patent

active

048738808

ABSTRACT:
A gearbox with a large number of ratios can be operated according to the laws of pressure variation with respect to the friction clutches provided for the engagement of the various ratios wherein the laws of pressure variation are no longer fixed but can be adapted to the various requirements for effective operation of the gearbox according to operative conditions of the vehicle in which the gearbox is installed. The valve units are exclusively electro-hydraulic proportional-responsive valve units. The operating conditions of the gearbox and the tractor in which it is installed are monitored by suitable devices which generate electrical signals indicative of the operating conditions. An electronic control unit is supplied with these signals and is arranged to pilot the electro-hydraulic proportional-responsive valves so as to regulate the manner of combined engagement and disengagement of the hydraulic clutches in dependence on the operative conditions.

REFERENCES:
patent: 3659479 (1972-05-01), Kiss
patent: 3945265 (1976-03-01), Bell et al.
patent: 4175448 (1979-11-01), Loew et al.
patent: 4203375 (1980-05-01), Miller
patent: 4275608 (1981-06-01), Brancolini
patent: 4690017 (1987-09-01), Taniguchi et al.
patent: 4722247 (1988-02-01), Schindo et al.
patent: 4724725 (1988-02-01), Harada et al.

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