Flow rate control valve and continuously variable automatic tran

Details Flow rate control valve and continuously variable automatic tran Flow rate control valve and continuously variable automatic tran

1997-06-03

1999-06-01

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

474 8, 13711508, 13711509, G05D 1100

Patent

active

059083670

ABSTRACT:
A fluid is guided inside a spool in which an orifice and drain holes are formed. The spool is displaced according to a hydraulic fluid pressure difference across the orifice. An outflow port, which is always connected with the orifice, and a drain passage, which overlaps with the drain holes according to a displacement position of the spool, are formed in the casing housing the spool. A stopper that limits the spool displacement beyond a position at which the overlap between the drain holes and drain passage is maximized is further provided. In this way, drainage of a fluid via the drain holes and drain passage is maintained at a maximum level even when fluid flows into the spool at a flow rate exceeding a predetermined level, and sharp increases of fluid flow rate from the orifice are thereby suppressed. By limiting excessive displacement of the spool, hysteresis is also prevented from occurring in the flow rate characteristics.

REFERENCES:
patent: 3920035 (1975-11-01), Werner
patent: 4718306 (1988-01-01), Shigematsu et al.
patent: 4841814 (1989-06-01), Satoh
patent: 5435795 (1995-07-01), Mochizuki et al.
patent: 5607371 (1997-03-01), Yamaguchi

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