System for controlling the pressure of oil in a system for a con

Details System for controlling the pressure of oil in a system for a con System for controlling the pressure of oil in a system for a con

1986-07-15

1987-06-23

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

3644241, 474 18, B60K 4112, B60K 4110, B60K 4118

Patent

active

046743634

ABSTRACT:
A control system for a continuously variable transmission has a line pressure control valve having ports and a spool for controlling the line pressure of oil supplied to a cylinder of a pulley device to change the transmission ratio. The line pressure control valve has chambers. When the transmission ratio reaches a maximum value after disengagement of a clutch, a line pressure reducing signal generates. The signal is applied to the line pressure control valve to shift the spool thereof, so that the line pressure is reduced to a minimum value. By controlling the pressure of oil supplied to the chambers in accordance with a desired line pressure, the spool is shifted, so that the line pressure is controlled.

REFERENCES:
patent: 4369675 (1983-01-01), van Deursen
patent: 4403975 (1983-09-01), Rattunde
patent: 4462275 (1984-07-01), Mohl et al.
patent: 4462277 (1984-07-01), Miki et al.
patent: 4466521 (1984-08-01), Hattori et al.
patent: 4543077 (1985-09-01), Yamamuro et al.
patent: 4545265 (1985-10-01), Abo et al.
patent: 4551119 (1985-11-01), Sugaya et al.
patent: 4561327 (1985-12-01), Niwa et al.
patent: 4589302 (1986-05-01), Oda et al.
patent: 4601680 (1986-07-01), Tokoro et al.
patent: 4612828 (1986-09-01), Ide et al.

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