Protective means for neutralizing the operation of a motor vehicle having automatic transmission

摘要

An all mechanically operated device for preventing the theft of motor vehicles having automatic transmission gears and having a main transmission oil line provided between the pressure outlet of a transmission oil pump and the automatic transmission gears for supplying transmission oil under pressure to the automatic transmission gears; said device comprising a branch transmission oil line connected between said main line and a transmission oil sump, and a selectively operated bypass valve connected in said branch line so that when said bypass valve is open, the transmission oil pressure to the automatic gears is neutralized thereby preventing transmission drive for the motor vehicle.