Spool-type control valve assembly with reduced spool stroke for

Details Spool-type control valve assembly with reduced spool stroke for Spool-type control valve assembly with reduced spool stroke for

1984-12-21

1987-03-31

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

B60K 4116

Patent

active

046533532

ABSTRACT:
A hydraulic control system for a continuously variable transmission having a cylinder for changing the effective diameter of a pulley to control a speed ratio of the transmission. The control system comprises a spool valve assembly communicating with the cylinder to control the supply and discharge flows of a fluid to and from the cylinder. The valve assembly comprises a shift-speed control valve unit for controlling a rate of variation in the speed ratio of the transmission. The shift-speed control valve unit has only two discharge ports associated with the fluid discharge from the cylinder. The shift-speed control valve unit may take the form of a spool valve having a spool axially movable to open and close the ports to permit and restrict the fluid flows through supply and discharge conduits communicating with the ports and the cylinder. The spool may only partially open the corresponding port to permit the fluid flow therethrough for supplying or discharging the fluid. The valve assembly may comprise a shift-direction switching valve unit for changing the direction in which the speed ratio is varied. The switching valve unit has only two discharge ports associated with the fluid discharge from the cylinder.

REFERENCES:
patent: 3893344 (1975-07-01), Dantlgraber et al.
patent: 4400164 (1983-08-01), Cadee
patent: 4458318 (1984-07-01), Smit et al.
patent: 4458560 (1984-07-01), Frank et al.
patent: 4462275 (1984-07-01), Mohl et al.
patent: 4470117 (1984-09-01), Miki et al.
patent: 4475416 (1984-10-01), Underwood
patent: 4476746 (1984-10-01), Miki et al.

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