Topic: Internal Gear/Lobe Pump

1
Introduction

• Topic Internal Gear/Lobe Pump
• Name Matthew Stoangi
• Objective
• To provide a clear understanding of the
  mechanics involved within an internal gear pump.
  As well as to acknowledge its function as a
  widely used oil pump design.

2
Internal Gear/Lobe Pump
4 Lobe in 5 Lobe Oil Pump
Internal View
External View
3
Internal Gear/Lobe Pump Defined

• Uses the meshing of gears to pump fluid by
  displacement in hydraulic applications.
• Gear pumps are fixed displacement devices where a
  fixed amount of fluid is pumped per single
  revolution
• Gear pumps are designed to operate in both
  forward and reverse directions
• Can function as either a pump or a motor

4
3. Fluid Fills Void Moves Towards Discharge Port
2. Diverging Gears Create Suction
4.Converging Gears Expel Fluid
1. Fluid Enters Through Intake Port
5. Fluid Exits Through Discharge Port
Gears In Constant Mesh No Fluid Travel At This
Point
Image lthttp//en.wikipedia.orggt
5
Operation Summary

• Gears separate on intake side of pump
• Suction pulls the fluid from intake port to fill
  the void
• Fluid is carried through the housing by the gears
  to the discharge port
• Fluid is expelled out the discharge port by the
  mesh of the gears
• Tight mechanical tolerances combined with
  constant rotation create the effective seal
  necessary to prevent reverse leakage and to
  promote overall efficiency

6
Advantages Of Design

• Total of two moving parts
• Non-pulsating constant and even discharge
• Ideal for high-viscosity liquids
• Operates well in either direction
• Single adjustable gear clearance
• Relatively compact and efficient design

7
Disadvantages Of Design

• Requires moderate speeds to be efficient
• Pressure limitations
• Single bearing accepts entire load
• Effective with high viscosity fluids only

8
Applications

• Lubrication
• Internal Combustion Engines
• Industrial
• Moving/Transferring Fluids
• Circulation
• High viscosity fluids

9
Discharge Port
Intake Port
Photo Taken With Outer Gear Removed To Expose
Ports
10
Conclusion

• In conclusion, upon dissection it has been
  discovered that the suction forces created by the
  meshing gears are responsible for the flow of the
  fluid through the pump. This flow of fluid
  creates a positive and non-pulsating displacement
  which makes this pump ideal for use in
  lubrication applications.

11
References

• "Gear Pump." Wikipedia Encyclopedia. Updated
  September 7 2005 Accessed October 3 2005
  lthttp//en.wikipedia.orggt
• "Internal Gear Pumps." Pump School. Created 1998
  Accessed October 3 2005 lthttp//www.pumpschool.co
  m/gt
• "Centered Internal Gear Pump." Integrated
  Publishing. Accessed October 3 2005
  lthttp//www.tpub.com/gt