Komatsu 6D105 engine 6136-52-1210 Komatsu PC220-3 excavator oil pump

Komatsu oil pumps are designed to generate pressure in the lubrication system to ensure lubrication of the moving parts of the internal combustion engine.

Komatsu Oil Pump The Komatsu oil pump is driven by the Komatsu crankshaft or Komatsu camshaft through the drive shaft.

According to the nature of control, oil pumps are divided into non-adjustable and adjustable types. Stationary pumps use pressure reducing valves to maintain constant pressure in the lubrication system. In a variable displacement pump, constant pressure is maintained by varying the pump output. Depending on the design, they can be divided into gear oil pumps and rotary oil pumps.

Komatsu gear oil pumps consist of two gears – a driving gear and a driven gear, mounted in a housing. Oil enters the pump through the suction port, is captured by the gears and pumped into the system through the discharge port. The performance of the gear pump is directly proportional to the crankshaft speed. When the pressure of the pumped oil exceeds a certain value, the pressure reducing valve is activated and releases part of the oil into the suction chamber or directly into the engine crankcase.

A rotary oil pump consists of two rotors – an inner (drive) rotor and an outer (driven) rotor, which are placed in a housing. Oil is drawn into the pump, captured by the rotor blades and forced into the system. Just like a gear pump, a pressure reducing valve is activated when necessary. This design features an unregulated rotary pump.

A more advanced design is the Komatsu rotary variable oil pump, which provides constant pressure throughout the crankshaft speed range.

How an adjustable rotary pump works

As the crankshaft speed of a Komatsu engine increases, the demand for oil increases, and accordingly, the pressure in the system decreases. When the pressure drops, the adjusting spring moves the stator, thereby changing the position of the driven rotor. Therefore, the volume of the suction chamber is increased and the performance of the pump is improved.

As engine speed decreases, oil consumption decreases and system pressure increases. As the pressure increases, the regulating spring is compressed, which moves the small loose stator and changes the position of the driven rotor. This results in a reduction in suction chamber volume and reduces the performance of the Komatsu pump.

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