Abstract: Realized is a water pump having improved readiness of maintenance. The water pump includes a first unit having a rotatably driven drive shaft and a second unit having a partition wall and configured to circulate cooling medium in association with rotation of the drive shaft. The first unit and the second unit are connectable to and detachable from each other. The partition wall defines an insertion hole for the drive shaft. In this arrangement, there is provided a closing member for closing the insertion hole of the partition wall when the first unit is detached from the second unit.

Abstract: A water pump includes a mechanical seal provided between a housing and a rotary shaft for preventing cooling water from leaking from a whirl chamber. The housing forms a space into which cooling water leaked from between the mechanical seal and the rotary shaft is flown and a water vent for discharging cooling water flown into the space. The housing is joined with a thermostat cover to form a reservoir communicating with the water vent. The reservoir has a drain for releasing evaporated cooling water to the air and a control wall for preventing cooling water remaining as liquid from flowing out through the drain.

Abstract: Realized is a water pump having improved readiness of maintenance. The water pump includes a first unit having a rotatably driven drive shaft and a second unit having a partition wall and configured to circulate cooling medium in association with rotation of the drive shaft. The first unit and the second unit are connectable to and detachable from each other. The partition wall defines an insertion hole for the drive shaft. In this arrangement, there is provided a closing member for closing the insertion hole of the partition wall when the first unit is detached from the second unit.

Abstract: A water pump includes a mechanical seal provided between a housing and a rotary shaft for preventing cooling water from leaking from a whirl chamber. The housing forms a space into which cooling water leaked from between the mechanical seal and the rotary shaft is flown and a water vent for discharging cooling water flown into the space. The housing is joined with a thermostat cover to form a reservoir communicating with the water vent. The reservoir has a drain for releasing evaporated cooling water to the air and a control wall for preventing cooling water remaining as liquid from flowing out through the drain.