Liquid (or rather, hybrid) engine cooling systems use water with additives or non-freezing antifreeze as a coolant. The coolant passes through the water jacket (a system of cavities in the walls of the cylinder block and cylinder head), taking heat away, enters the radiator, where it gives off heat to the atmosphere, and returns to the engine again. However, the coolant itself will not flow anywhere, so forced circulation of the coolant is used in cooling systems.
For circulation, liquid circulation pumps are used , driven by a crankshaft, timing shaft or an integrated electric motor.
In many engines, two pumps are installed at once – an additional pump is needed to circulate the coolant in the second circuit, as well as in the cooling circuits for exhaust gases, air for the turbocharger, etc. Usually the additional pump (but not in a dual-circuit cooling system) is electrically driven and turns on when needed.
Pumps driven by a crankshaft (using a V-belt drive, usually with a single belt, the pump, fan and generator are driven into rotation, the drive is carried out from a pulley in front of the crankshaft);
- Pumps driven by the timing shaft (using a toothed belt);
- Pumps driven by their own electric motor (usually additional pumps are made this way).
All pumps, regardless of the type of drive, have the same design and principle of operation.
Post time: Jan-18-2022