How Does The Rotary Oil Pump of The Diesel Generator Work?

The rotary oil pump of a diesel generator consists of components such as a casing, inner rotor, outer rotor, and pump body. The inner rotor is fixed to the rotor shaft with a key or pin, and is directly or indirectly driven by the crankshaft gear. The inner rotor drives the outer rotor to rotate together in the same direction. The inner rotor has 4 convex teeth and the outer rotor has 5 concave teeth, so that the inner and outer rotors rotate in the same direction but not synchronously.

The tooth profile of the rotor is designed so that when the rotor is turned at any angle, the tooth profile lines of each tooth of the inner and outer rotors can always make point contact with each other. In this way, four working chambers are formed between the inner and outer rotors, and the volume of these four working chambers changes continuously as the rotor rotates. On one side of the oil inlet passage, due to the disengagement of the rotor, the volume gradually increases, creating a vacuum. The oil is sucked in, and the rotor continues to rotate. The oil is carried to the side of the oil outlet passage. At this time, the rotor enters the engagement, causing the volume of this cavity to decrease, the oil pressure to increase, and the oil is squeezed out from the teeth and pressed out through the oil outlet. In this way, as the hand rotates continuously, the oil is constantly sucked in and pressed out.

The oil pumping principle is that due to the continuous entry and exit of the gear teeth in the gear pump, the volume of the oil suction chamber and the oil discharge chamber change. When the gear teeth exit the engagement, the volume of the oil suction chamber increases, generating suction and oil suction. When the gear teeth enter the engagement, the volume of the oil discharge chamber decreases, resulting in pressure and oil discharge.

As for the pressure generated by the oil pump, it is mainly due to the flow resistance of the oil in the pressure range of the lubrication system. It can be seen that the oil pressure of the lubrication system depends on the flow resistance at the end of the oil pump. If the flow resistance at the end of the oil pump in the lubrication system is high, the oil pressure will be high. On the contrary, the flow resistance is small and the oil pressure is low.

The actual pumping amount of the oil pump is equal to the theoretical pumping amount minus the oil pump leakage amount. If the leakage of the oil pump increases, the effective pump oil volume decreases, that is, the output oil volume decreases and the pressure decreases.

The rotary oil pump has a compact structure, small size, light weight, high oil suction vacuum, large pump oil volume, good oil supply uniformity, and low cost. It is widely used in small and medium-sized diesel engines, such as the Cummins 6BT, Iveco 8140, and Deutz BFM1013.

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