Oil pump pressure control device

Abstract

A device for reducing friction in a variable flow rate oil pump in which two discharge ports are provided and which uses three rotors while maintaining characteristics identical to the pressure characteristics of a common oil pump. The device is configured from a first discharge passage to an engine, a return passage that returns to an intake side of an outer circumferential side rotor, a second discharge passage to the engine, a return passage that returns to an intake side of an inner circumferential side rotor, and a pressure control valve whose valve main body is provided between a discharge port from the inner circumferential side rotor and the first discharge passage. The first discharge passage and second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first discharge passage and the second discharge passage are open; an intermediate revolution range in a state in which the first discharge passage and second discharge passage are open and a first intake side of the return passage is closed while a second intake side of the return passage is open; and a high revolution range in a state in which the second discharge passage is closed while the first discharge passage and the return passage are open.

1 . An oil pump pressure control device comprising:
 an oil pump having three rotors including an outer circumferential side rotor and an inner circumferential side rotor; a first discharge passage for feeding oil from the outer circumferential side rotor to an engine; a return passage that returns to an intake side of the outer circumferential side rotor; a second discharge passage for feeding oil from the inner circumferential side rotor to the engine; a return passage that returns to an intake side of the inner circumferential side rotor; and a pressure control valve whose valve main body is provided between the discharge port from the inner circumferential side rotor and the first discharge passage, wherein   the first discharge passage and the second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first discharge passage and the second discharge passage are open; an intermediate revolution range in a state in which the first discharge passage and the second discharge passage are open and a first inlet side of the return passage is closed while a second inlet side of the second return passage is open; and a high revolution range in a state in which the second discharge passage is closed while the first discharge passage and the return passage are open.   
   
   
       2 . An oil pump pressure control device comprising:
 an oil pump having three rotors including an outer circumferential side rotor and an inner circumferential side rotor; a first discharge passage for feeding oil from the outer circumferential side rotor to an engine; a first return passage that returns to an intake side of the outer circumferential side rotor; a second discharge passage for feeding oil from the inner circumferential side rotor to the engine; a second return passage that returns to an intake side of the inner circumferential side rotor; and a pressure control valve whose valve main body is provided between a discharge port from the inner circumferential side rotor and the first discharge passage, wherein   the first discharge passage and the second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first discharge passage and the second discharge passage are open; an intermediate revolution range in a state in which the first discharge passage and the second discharge passage are open and the first return passage is closed while the second return passage is open; and a high revolution range in a state in which the second discharge passage is closed while the first discharge passage and the first return passage and the second return passage are open.   
   
   
       3 . The oil pump pressure control device according to  claim 1 , wherein the pressure control valve is configured as a type comprising a first valve portion and a second valve portion. 
   
   
       4 . The oil pump pressure control device according to  claim 1 , wherein the pressure control valve is configured as a type comprising a first valve portion, a second valve portion and a third valve portion. 
   
   
       5 . The oil pump pressure control device according to  claim 2 , wherein the pressure control valve is configured as a type comprising a first valve portion and a second valve portion. 
   
   
       6 . The oil pump pressure control device according to  claim 2 , wherein the pressure control valve is configured as a type comprising a first valve portion, a second valve portion and a third valve portion.