Pulse pressure decreasing type variable oil pump

Abstract

A pulse pressure decreasing type variable oil pump may include an inner chamber rotatably receiving a vane therein, wherein an outer ring rotatably covers the inner chamber, a housing enclosing the outer ring, the inner chamber, and the vane therein and forming a narrow section between the housing and the outer ring to increase pressure of oil flowing therein, and a pressure chamber grooved in an inner side of the housing and fluid-communicating the inner chamber with the narrow section.

1 . A pulse pressure decreasing type variable oil pump that has a narrow section increasing pressure of oil flowing between a housing and an outer ring covering a vain rotated by a rotary shaft, wherein the housing has a pressure chamber fluid-communicating with the narrow section to reduce pressure at a path where oil flowing in the housing is discharged to an outlet. 
     
     
         2 . The pulse pressure decreasing type variable oil pump as defined in  claim 1 , wherein the pressure chamber is formed at the opposite side to a spring chamber receiving a variable spring. 
     
     
         3 . The pulse pressure decreasing type variable oil pump as defined in  claim 1 , wherein the pressure chamber includes a main chamber grooved in a crescent shape on an inner side of the housing within approximately 180° in an oil flow direction in the narrow section. 
     
     
         4 . The pulse pressure decreasing type variable oil pump as defined in  claim 3 , wherein the main chamber has a larger width at a rear end thereof than the width at a front end thereof in the oil flow direction in the narrow section. 
     
     
         5 . The pulse pressure decreasing type variable oil pump as defined in  claim 4 , wherein the rear end having the larger width is positioned at the narrow section that allows the oil to flow between the housing and the outer ring. 
     
     
         6 . The pulse pressure decreasing type variable oil pump as defined in  claim 3 , wherein the pressure chamber has a divergent chamber diverging from the main chamber into the narrow section. 
     
     
         7 . The pulse pressure decreasing type variable oil pump as defined in  claim 6 , wherein the divergent chamber diverges straight and has a width between the width of the front end and the width of the rear end of the main chamber. 
     
     
         8 . The pulse pressure decreasing type variable oil pump as defined in  claim 7 , wherein the divergent chamber is positioned close to the rear end having the large width of the main chamber. 
     
     
         9 . A pulse pressure decreasing type variable oil pump, comprising:
 an inner chamber rotatably receiving a vane therein, wherein an outer ring rotatably covers the inner chamber;   a housing enclosing the outer ring, the inner chamber, and the vane therein and forming a narrow section between the housing and the outer ring to increase pressure of oil flowing therein; and   a pressure chamber grooved in an inner side of the housing and fluid-communicating the inner chamber with the narrow section.   
     
     
         10 . The pulse pressure decreasing type variable oil pump as defined in  claim 9 , wherein the pressure chamber is formed to be ranged from a front of an outlet and to a rear of the outlet with a predetermined length substantially along a rotary locus of the vane. 
     
     
         11 . The pulse pressure decreasing type variable oil pump as defined in  claim 10 , wherein the pressure chamber fluid-communicates with the outlet. 
     
     
         12 . The pulse pressure decreasing type variable oil pump as defined in  claim 9 , wherein the pressure chamber includes a main chamber grooved in a crescent shape on the inner side of the housing and cross-section of the main chamber is gradually increased along an oil flow direction in the narrow section. 
     
     
         13 . The pulse pressure decreasing type variable oil pump as defined in  claim 12 , wherein the main chamber includes a large width portion at a rear end thereof and a small width portion at a front end thereof, and wherein the small width portion is disposed adjacent to an outlet. 
     
     
         14 . The pulse pressure decreasing type variable oil pump as defined in  claim 13 , wherein the small width portion fluid-communicates with the outlet. 
     
     
         15 . The pulse pressure decreasing type variable oil pump as defined in  claim 12 , wherein the pressure chamber includes a divergent chamber formed in the inner side of the housing and diverging from the main chamber into the narrow section.