Hydraulic control system for transmission

Details Hydraulic control system for transmission Hydraulic control system for transmission

1999-03-04

2000-08-29

Marmor, Charles A.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

474 69, F16H 5900

Patent

active

061100625

ABSTRACT:
A transmission is constituted by drive and driven side movable pulleys (11 and 16), a metallic V belt (15) and drive and driven side cylinder chambers (14 and 19) for controlling the width of both pulleys. A hydraulic control system for the transmission, according to the present invention, is characterized as follow. The line pressure (PL) is set using first and second regulator valves (31, 32). First control oil pressure (PC1) supplied to the drive side cylinder chamber is controlled using a first linear solenoid valve (41) and a first pulley control valve (43). Second control oil pressure (PC2) supplied to the driven side cylinder chamber is set using a second linear solenoid valve (45) and a second pulley control valve (47). In addition, first and second regulator valves (31, 32) regulates the line pressure using control back pressure which is the higher of first and second control back pressure respectively set by the first and second linear solenoid valves (41, 45).

REFERENCES:
patent: 5183439 (1993-02-01), Yumoto et al.
patent: 5409421 (1995-04-01), Sakai et al.
patent: 5427579 (1995-06-01), Kanehara et al.
patent: 5649876 (1997-07-01), Morishita
patent: 5665023 (1997-09-01), Aoki et al.
patent: 5776028 (1998-07-01), Matsuda et al.

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