Apparatus Having Control Valve and Variable Capacitance Pump and Hydraulic Pressure Circuit of Internal Combustion Engine in which the Same Apparatus is Used

Abstract

In a hydraulic pressure circuit including an introduction section through which oil is introduced, a main passage section installed at a downstream side of the introduction section to be communicated with a supply section through which oil is supplied to each of slide sections of an internal combustion engine, a branch passage branched from the main passage section to supply oil to a hydraulic pressure actuator, and a control valve having a valve body which is moved in accordance with a pressure of an upstream side thereof, and a variable capacitance pump configured to drain oil to the introduction section, the variable capacitance pump is configured to vary a drained flow quantity in accordance with the drained pressure of oil and a pressure under which the oil drained flow quantity is started to be varied is higher than a pressure under which the valve body is started to move.

What is claimed is: 
     
         1 . A control valve apparatus comprising:
 a hydraulic pressure circuit including: an introduction section ( 15   a ) into which oil is introduced; a main passage section installed at a downstream side of the introduction section to communicate with a supply section ( 20 ) supplying oil to each lubricating section of an internal combustion engine; and a control valve ( 22 ) having a valve body ( 29 ) which is moved to control an oil flow quantity to the supply section, the control valve apparatus further comprises a flow passage cross sectional area enlargement section ( 72 ) configured to enlarge a cross sectional area of a flow passage through which oil is caused to flow into the supply section from the introduction section when the valve body becomes immovable.   
     
     
         2 . The control valve apparatus as claimed in  claim 1 , wherein the flow passage cross sectional area enlargement section is a breaker mechanism configured to release a fixture state thereof to enlarge the flow passage cross sectional area when a pressure at the main passage section is equal to or higher than a predetermined pressure. 
     
     
         3 . The control valve apparatus as claimed in  claim 2 , wherein the control valve apparatus further comprises a detecting section configured to detect that the breaker mechanism enlarges the flow passage. 
     
     
         4 . The control valve apparatus as claimed in  claim 3 , wherein the hydraulic pressure actuator is a variable valve mechanism configured to vary an operation of an engine valve and to enable a detection of an operation state thereof and wherein the detecting section detects the enlargement of the flow passage cross sectional area according to an operation response characteristic of the variable valve mechanism in a state in which the valve body decreases the flow quantity of the valve body to the supply section. 
     
     
         5 . The control valve apparatus as claimed in  claim 1 ,
 wherein the detecting section comprises a pressure sensor ( 73 ) detecting a pressure at an upstream side of the flow passage cross sectional area enlargement section and, in a case where the pressure in a state in which the valve body decreases the flow quantity to the supply section is equal to or lower than a predetermined pressure, the pressure sensor detects the enlargement of the flow passage cross sectional area.   
     
     
         6 . The control valve apparatus as claimed in  claim 1 , wherein, in a case where the detecting section detects that the flow passage cross sectional area enlargement section enlarges the flow passage cross sectional area, an alarm is issued. 
     
     
         7 . The control valve apparatus as claimed in  claim 1 ,
 wherein a filter ( 74 ) is interposed between the branch passage ( 21 ) at a downstream side of the main passage and the control valve.   
     
     
         8 . A control valve apparatus comprising:
 a hydraulic pressure circuit including: an introduction passage ( 15   a ) into which oil is introduced from an oil pump; a main passage ( 15   b ) installed at a downstream side of the introduction section and communicated with a supply passage ( 20 ) through which oil is supplied to each lubricating section of an internal combustion engine; a branch passage branched from the main passage and through which oil is supplied to a hydraulic pressure actuator: and a control valve ( 22 ) having a valve body ( 29 ) which is moved to control an oil flow quantity to the supply section, wherein the control valve comprises: a biasing member ( 30 ) configured to bias the valve body in a direction for the flow quantity to the supply section to be decreased; a pressure receiving section ( 29   c ) configured to receive a pressure at an upstream side of the valve body to move the valve body against a biasing force of the biasing member; a bypass passage ( 70 ) communicating between the upstream side of the valve body and a downstream side of the valve body; and a relief valve ( 75 ) installed on the bypass passage to increase a flow quantity of oil passing through the bypass passage when a pressure of an upstream side of the valve body is equal to or higher than a pressure under which the valve is moved against the biasing force of the biasing member.   
     
     
         9 . The control valve apparatus as claimed in  claim 1 , wherein the control valve apparatus further comprises an electromagnetic valve ( 80 ) and the valve body of the control valve is driven by a differential pressure developed by the electromagnetic valve. 
     
     
         10 . The control valve apparatus as claimed in  claim 9 , wherein the control valve further comprises a pressure receiving section by which an operation force for the valve body is developed in the same direction as the biasing force of the biasing member and a pressure switched between the pressure at the upstream side of the valve body and a low pressure lower than the pressure at the upstream side of the biasing member is acted upon the pressure receiving section.