4 Lobe in 5 Lobe Oil PumpsBy Christopher Yang

Objective: To impart a clear understanding of the design and function of 4 Lobe in 5 Lobe Oil Pumps

Topics to be Covered:

•What is a 4 Lobe in 5 Lobe Oil Pump?

•What are the parts to the oil pump?

•How does the oil pump work?

•Ending Remarks

What is a 4 Lobe in 5 Lobe Oil Pump?• A 4 Lobe in 5 Lobe Oil Pump is a special type of internal pump designed to

pump thin to moderate viscosity fluids

• The pump operates at relatively low speeds

• Inlet pressures are relatively low

• Provides constant, even discharge

Front View Cutaway (Face Plate removed) Rear View

Parts of the Oil PumpThe main components to a 4 Lobe in 5 Lobe Oil Pump include:

• The main housing

• 4 Lobe Rotor

• 5 Lobe Rotor

• Inlet and outlet ports

• Shaft connected to 4 lobe rotor; connects to large gear outside housing

How It Works

• Shaft spins• Inner rotor unmeshes with outer rotor• Chamber forms• Negative pressure draw fluid

How It Works (Con’t)• Gear continues moving to outlet• Chamber becomes smaller as inner rotor meshes with outer rotor

• Resulting decrease in volume forces fluid into outlet

Ending Remarks

• The construction of 4 Lobe in 5 Lobe pumps are very simple

• The way they work is simple to comprehend, but complex in design

• Harmit Grewel will explain other facts of 4 Lobe in 5 Lobe Oil Pumps

Resources:

• http://www.pumpschool.com/principles/lobe.htm

• http://www.pumpschool.com/principles/internal.htm