| 摘要 |
A cooling system has a radiator for cooling coolant of an automotive engine, cooling fan (33) for cooling the coolant in the radiator (22), and a thermostat (1) for controlling coolant temperature. The thermostat (1) has a housing having a flange (16), an actuating rod (3) secured to the housing at a first end thereof, a guide member (4) slidably mounted on the actuating rod (3), a resilient seal spool (5) provided around a second end portion of the actuating rod (3) and secured to the guide member (4), a heat sensitive cylinder (8) housing the seal spool (5) and secured to the guide member (4), wax pellets (7) provided in the heat sensitive cylinder to enclose the seal spool (5). The flange (16) has a hole (19a) so as to pass a coolant, and the thickness of the resilient seal spool (5) being set between 25% and 5% of the diameter of the actuating rod (3), thereby reducing a spring constant of a return spring of the thermostat (1). A cooling fan switch (67) is provided for starting the cooling fan (33) at a low coolant temperature. <IMAGE> |
