Engine oil pump provided automatic adjustment of oil supply amount

Abstract

An engine oil pump includes an oil supply mechanism and an adjustment mechanism. The oil supply mechanism includes an oil inlet, an oil outlet, an oil passage with two ends communicating with the oil inlet and oil outlet, and a driving gear and a driven gear located in the oil passage. The driving gear and driven gear are engaged at a selected depth to determine oil supply amount passing through the oil passage. The adjustment mechanism includes a housing and an actuation piston fastened to the driven gear. The housing has an engine oil duct on the periphery including one end communicating with the oil outlet and introducing engine oil from the oil outlet to one side of the actuation piston for storing. The actuation piston is pushed by pressure of the engine oil to drive the driven gear to move, and the oil supply amount is also changed.

What is claimed is: 
     
         1 . An engine oil pump provided automatic adjustment of oil supply amount, comprising an oil supply mechanism and an adjustment mechanism, wherein:
 the oil supply mechanism includes an oil inlet, an oil outlet, an oil passage with two ends communicating with the oil inlet and the oil outlet, and a driving gear and a driven gear located in the oil passage that being engaged with each other; the driving gear and the driven gear being engaged at a selected depth to determine oil supply amount passing through the oil passage; and   the adjustment mechanism includes:   a housing which includes a housing space and an engine oil duct located on the periphery of the housing communicating with the housing space and including one end communicating with the oil outlet; and   an actuation piston held in the housing space and fastened to the driven gear, the engine oil duct introducing engine oil from the oil outlet to one side of the actuation piston for storing, the actuation piston being pushed by pressure of the engine oil to drive the driven gear to move so that relative positions of the driven gear and the driving gear are changed to alter the oil supply amount.   
     
     
         2 . The engine oil pump of  claim 1 , wherein the housing space includes an actuator casing held in the housing space of the housing, the actuator casing including a moving space to constrain movement of the actuation piston and at least one directing vent on the periphery thereof to direct the engine oil flowed into the housing to the side of the actuation piston. 
     
     
         3 . The engine oil pump of  claim 2 , wherein the moving space includes an elastic element butting another side of the actuation piston. 
     
     
         4 . The engine oil pump of  claim 2 , wherein the housing and the actuator casing include respectively an opening to allow the actuation piston to couple with the driven gear. 
     
     
         5 . The engine oil pump of  claim 2 , wherein the actuator casing includes a plurality of directing vents on the periphery and the housing includes at least one directing groove to direct the engine oil from the engine oil duct to the directing vents. 
     
     
         6 . The engine oil pump of  claim 3 , wherein the actuator casing further is coupled with a cap to seal the elastic element and the actuation piston in the actuator casing. 
     
     
         7 . The engine oil pump of  claim 1 , wherein the engine oil duct is connected to one end of the oil passage close to the oil outlet. 
     
     
         8 . The engine oil pump of  claim 1 , wherein the oil outlet is connected to an engine to supply the engine oil to the engine, the driving gear being driven with the engine.