Hydraulic system for torque converter with lock-up clutch

Details Hydraulic system for torque converter with lock-up clutch Hydraulic system for torque converter with lock-up clutch

1988-10-31

1991-01-15

Lorence, Richard

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, F16H 4502

Patent

active

049846647

ABSTRACT:
In order to increase a torque transmission capacity of a lock-up clutch without any increase in the internal pressure of a torque converter, a lock-up clutch release circuit and a lock-up clutch engagement circuit share a primary relief valve, and the lock-up release circuit is further provided with a secondary relief valve disposed between a lock-up control valve and the torque converter. Thus, when the lock-up clutch engagement circuit is opened, the primary relief valve works to prevent the pressure of hydraulic fluid from increasing above a first predetermined value, whereas, when the lock-up clutch release circuit is opened, the secondary relief valve causes a drop in the hydraulic pressure and prevents the hydraulic pressure from increasing above a second predetermined value. The first predetermined value is higher than the second predtermined value.

REFERENCES:
patent: 2675102 (1954-04-01), Robinson
patent: 3497043 (1970-02-01), Leonard
patent: 4294140 (1981-10-01), Iwanaga et al.
patent: 4570770 (1986-02-01), Nishikawa et al.
patent: 4660693 (1987-04-01), Taga et al.
patent: 4768635 (1988-09-01), Sakurai et al.
Toyota Vista E-SV10 Series, A/T Mounted Car, New Car Introduction Manual, Jul., 1982, pp. 11-12.

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