Hydraulic shift control device for an automatic transmission hav

Details Hydraulic shift control device for an automatic transmission hav Hydraulic shift control device for an automatic transmission hav

1985-12-30

1987-07-21

Bonck, Rodney H.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74868, 74878, B60K 4106

Patent

active

046809899

ABSTRACT:
A vehicle speed-dependent and engine load-dependent hydraulic control device for heavy vehicles shifting between two gear ratios is provided with a modulator valve modulating main input pressure by action of the engine load-dependent pressure, a shift valve shiftable by action of modulated pressure supplied to the shift valve from the modulator valve through a signal valve and a signal valve shifting down by the action of a spring and the engine load-dependent pressure and vice-versa by the action of vehicle speed-dependent pressure. The control device is further provided with a pilot shuttle valve controlling supply of the higher of two pressures, the load-dependent pressure and a limiting pressure to the signal valve to shift down according to the operator's command.

REFERENCES:
patent: 4041810 (1977-08-01), Harmon et al.
patent: 4075912 (1978-02-01), Schaefer
patent: 4126154 (1978-11-01), McQuinn
patent: 4394827 (1983-07-01), Kubo et al.
patent: 4406181 (1983-09-01), Kubo et al.

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