Vehicle with a drive clutch automatically disengaged in case of engine overheating

摘要

The tractor engine overheating protection device has an electrically operated clutch (12) between the engine and the take-off shaft. A temperature switch (60) operates in dependence on the engine temperature, and automatically disengages the clutch when a fixed engine temperature is exceeded. A resistor (46) is connected between the temperature switch and the clutch control circuit (16), with the clutch relay coil (42) being connected between a junction of the resistor, the temperature switch and the earth. The resistor is a thermistor, thereby limiting the power loss of the temperature switch.