Variable displacement gerotor pump

Abstract

A gerotor pump includes a casing including a pumping chamber, a fixed gear being inserted into the casing and rotating at a fixed position, including a plurality of teeth formed inside a cylinder, and including at least one fluid hole at one end of the cylinder to allow a fluid to flow from the pumping chamber or into the pumping chamber, a moving gear provided inside the fixed gear and including one less number of teeth than a number of the plurality of teeth of the fixed gear and movable in an axial direction, a gear block arranged inside the fixed gear and movable in the axial direction, a gear ring arranged outside the moving gear and movable with respect to the moving gear in the axial direction, a gear ring cover provided at one end of the casing and including a hole in which the gear ring is rotated.

What is claimed is: 
     
         1 . A variable displacement gerotor pump, comprising:
 a casing including a pumping chamber having one or more fluid inlets;   a fixed gear being inserted into the casing and rotating at a fixed position, having a shape of a cylinder, including a plurality of teeth formed inside the cylinder, and including at least one fluid hole at one end of the cylinder to allow a fluid to flow from the pumping chamber or into the pumping chamber;   a moving gear provided inside the fixed gear and in mesh with the fixed gear and movable in an axial direction, the moving gear including one less number of teeth than a number of the plurality of teeth of the fixed gear;   a gear block arranged inside the fixed gear, the gear block being in contact with one end of the moving gear and movable in the axial direction;   a gear ring arranged outside the moving gear and movable with respect to the moving gear in the axial direction; and   a gear ring cover provided at one end of the casing and including a hole in which the gear ring is rotated.   
     
     
         2 . The variable displacement gerotor pump according to  claim 1 , wherein one end of the fixed gear is in contact with the gear ring cover and the gear ring, and
 wherein the one end of the moving gear is in contact with the gear block, and another end of the moving gear is disposed through the gear ring.   
     
     
         3 . The variable displacement gerotor pump according to  claim 2 , further comprising:
 a gear block bolt, a moving gear sleeve, or a moving gear common shaft configured to allow the gear block to be rotated from a contact surface between the moving gear and the gear block, and the moving gear and the gear block are movable together in the axial direction.   
     
     
         4 . The variable displacement gerotor pump according to  claim 1 , further comprising:
 a moving gear common shaft inserted through a moving gear hole formed in a central portion of the moving gear and including a sleeve provided on at least one end of the moving gear; and   a moving gear shaft inserted through a hole formed in a central portion of the moving gear common shaft.   
     
     
         5 . The variable displacement gerotor pump according to  claim 4 , further comprising:
 a moving gear shaft support provided outside the gear ring cover to fix and support at least one end of the moving gear shaft.   
     
     
         6 . The variable displacement gerotor pump according to  claim 1 , further comprising:
 a driving flange connected to the fixed gear and configured to rotate the fixed gear.   
     
     
         7 . The variable displacement gerotor pump according to  claim 1 , further comprising:
 a hydraulic chamber inside the casing, having one side formed on another side of the gear block in contact with the moving gear; and   a fluid connection passage configured to allow the fluid that flows into the pumping chamber to be moved to the hydraulic chamber.   
     
     
         8 . The variable displacement gerotor pump according to  claim 7 , further comprising:
 a spring having a restoring force capable of balancing a force with respect to a force applied on the gear block in the hydraulic chamber.   
     
     
         9 . The variable displacement gerotor pump according to  claim 8 , further comprising:
 a spring support capable of fixing the spring.   
     
     
         10 . A variable displacement gerotor pump, comprising:
 A casing including a plurality of pumping chambers, each of the plurality of pumping chambers having one or more fluid inlets;   a fixed gear being inserted into the casing and rotating at a fixed position, having a shape of a cylinder, including a plurality of teeth formed inside the cylinder, and including at least one fluid hole at both ends of the cylinder to allow a fluid to flow from the plurality of pumping chambers or into the plurality of pumping chambers;   two moving gears provided inside the fixed gear and in mesh with the fixed gear and movable in an axial direction, each of the two moving gears including one less number of teeth than a number of teeth of the fixed gear;   a gear block arranged inside the fixed gear and provided between the two moving gears and movable in the axial direction;   two gear rings arranged outside the two moving gears and movable with respect to each of the two moving gears in the axial direction; and   two gear ring covers provided at both ends of the casing, respectively, and including holes in which the two gear rings are rotated, respectively.