4.8.5 Water pump
The water pump forces the coolant to circulate through the system. This pump is of centrifugal type. The pump rotates using a drive belt, which is mounted on the crankshaft pulley.
The pump has a rather simple design: a shaft, at one end of which an impeller is installed (shown in Figure 4.36), and a pulley for a drive belt is situated at the other end.
The shaft is supported by a bearing, which is installed in the pump cover. Often a cavity or afflux in the cylinder block is the pump housing. Water flows through the inlet pipe to the inside of the housing and is supplied to the center of the rotating impeller. In this case, the water is carried away by the impeller. It acquires a rotational motion. Under the action of centrifugal force, it is thrown to the walls of the housing and through the outlet channel under pressure enters the engine cooling jacket.
Figure 4.36 Water pump. Impeller.
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