Electrically controlled transmission soft shifter

Details Electrically controlled transmission soft shifter Electrically controlled transmission soft shifter

1985-12-16

1987-06-23

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Progressive engagement

13762564, 192 85R, 192109F, F16D 2514

Patent

active

046746137

ABSTRACT:
An electrically controlled valve for automatically controlling the engagement of the clutch in heavy vehicle gear transmissions giving a "soft shifting" action. The position of a three way, three position, pressure actuated, directional valve is controlled by an electrically proportional and controlled relief valve which regulates the pressure on the directional valve. In the first position, the clutch is communicated to tank. In the second position, there is full flow to the clutch. In the third position, there is first a restricted flow to and then control of the pressure on the clutch by the relief valve.

REFERENCES:
patent: 3286734 (1966-11-01), Hartshorne
patent: 3461909 (1969-08-01), Vohringer
patent: 3727487 (1973-04-01), Forster et al.
patent: 3856047 (1974-12-01), Takayama
patent: 3964506 (1976-06-01), Grundman
patent: 4457411 (1984-07-01), Hiramatsu
patent: 4506773 (1985-03-01), Schott
patent: 4553732 (1985-11-01), Brundage et al.
patent: 4560047 (1985-12-01), McCarthy et al.
patent: 4576200 (1986-03-01), Janecke et al.

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