Star Pump

Star pump is a common type pump used in pumping lubricating fluids such as oil. It is also known as Gerotor Pump.

Features of a Star Pump:

• The pump consists of a rotating star shaped gear inside of another gear.
  
  
• The inner gear has one less tooth than the outer gear.
  
  
• The inner gear is usually the drive gear. It pushes the outer, larger gear around.
  
  
• A tight fit where the gears mesh keeps fluid advancing around the pump.
  
  
• As the teeth on the two gears separate the suction draws in the liquid.
  
  
• This pump is best used for pumping lubricating fluids such as oil because the teeth must rub against each other somewhat. The amount of rubbing is slight but not insignificant.