1. 4 Lobe in 5 Lobe Oil Pumps By 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

2. 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

3. Parts of the Oil Pump The 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

4. How It Works Shaft spins Inner rotor unmeshes with outer rotor Chamber forms Negative pressure draw fluid

5. 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

6. 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

7. Resources: http://www.pumpschool.com/principles/lobe.htm http://www.pumpschool.com/principles/internal.htm