Gerotor pump

Abstract

Provided is a gerotor pump including an inner rotor connected to a driving axis of a motor to transfer rotation force, an outer rotor formed at an outer side of the inner rotor, and a casing receiving the inner and outer rotors therein and provided with an inlet and an outlet, the inner and outer rotors forming several closed chambers while eccentrically rotating, having a predetermined clearance therebetween, to transfer a fluid, wherein a pressure chamber is formed in the casing in a direction in which force acts on the outer rotor by pressure of the fluid to offset the force, such that frictional force between the outer rotor and the casing decreases, thereby making it possible to improve performance and efficiency of the pump.

What is claimed is: 
     
         1 . A gerotor pump comprising:
 a lower casing having an inhalation channel formed in an upper surface thereof so as to be in communication with an inlet formed at one side thereof;   an upper casing coupled to an upper side of the lower casing and having a discharge channel formed in a lower surface thereof so as to be in communication with an outlet formed at one side thereof; and   a gerotor received between the upper and lower casings and having inner and outer rotors engaged with each other so as to eccentrically rotate,   wherein the upper casing includes a pressure chamber formed at a discharge chamber side of an inner peripheral surface thereof contacting the outer rotor, the pressure chamber being in communication with the outlet of the upper casing.   
     
     
         2 . A gerotor pump comprising:
 a lower casing having an upper portion formed to be opened and having an inhalation channel formed in an upper surface thereof so as to be in communication with an inlet formed at one side thereof;   a gerotor received in the lower casing and having inner and outer rotors engaged with each other so as to eccentrically rotate; and   a flexible plate coupled to an upper surface of the gerotor and made of a flexible material so as to selectively form a discharge channel by internal pressure of the gerotor,   wherein the lower casing includes a pressure chamber formed at a discharge chamber side of an inner peripheral surface thereof contacting the outer rotor, the pressure chamber being in communication with the discharge channel.