| 摘要 |
A hydraulic system for a torque converter is disclosed which has a converter chamber and a lock-up clutch dividing the converter chamber into a converter pressure section and a back-up pressure section. A lock-up control valve is provided, which has a first position wherein pressurized hydraulic fluid is supplied to the converter chamber and a second position wherein fluid is discharged from the back-up pressure section. A drain passage with a bimetal orifice normally closes the drain passage and is operative to open the drain passage when a temperature of the fluid in the drain passage is higher than a predetermined temperature.
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