Valve opening/closing timing control device

Abstract

A valve opening/closing timing control device includes: a driving side rotational member synchronously rotatable with a crankshaft of an internal combustion engine; a driven side rotational member arranged coaxially with the driving side rotational member and synchronously rotatable with a camshaft that opens and closes any one of intake and exhaust valves of the internal combustion engine; a phase converting mechanism displacing a relative phase between the driving side rotational member and the driven side rotational member to an advanced angle phase side or a retarded angle phase side by distributing an operating fluid to each of two kinds of pressure chambers, the volume of which is complementarily varied by a movable partition; and a biasing member biasing the relative phase toward a predetermined phase suitable for a start-up of the internal combustion engine except for a most advanced angle phase and a most retarded angle phase.

1 . A valve opening/closing timing control device comprising:
 a driving side rotational member synchronously rotatable with a crankshaft of an internal combustion engine;   a driven side rotational member arranged coaxially with the driving side rotational member and synchronously rotatable with a camshaft that opens and closes any one of intake and exhaust valves of the internal combustion engine;   a phase converting mechanism displacing a relative phase between the driving side rotational member and the driven side rotational member to an advanced angle phase side or a retarded angle phase side by distributing an operating fluid to each of two kinds of pressure chambers, the volume of which is complementarily varied by a movable partition; and   a biasing member biasing the relative phase toward a predetermined phase suitable for a start-up of the internal combustion engine except for a most advanced angle phase and a most retarded angle phase.   
     
     
         2 . The valve opening/closing timing control device according to  claim 1 , wherein the biasing member includes a first biasing member to bias the relative phase in a direction of the advanced angle phase and a second biasing member to bias the relative phase in a direction of the retarded angle phase, and
 the valve opening/closing timing control device further includes a first restricting portion to define the biasing force of the first basing member between the predetermined phase and the most retarded angle phase, and a second restricting portion to define the biasing force of the second biasing member between the predetermined phase and the most advanced angle phase.   
     
     
         3 . The valve opening/closing timing control device according to  claim 1 , wherein the biasing member has the biasing force against a displacing force acting on the driven side rotational member based on torque fluctuation of the camshaft. 
     
     
         4 . The valve opening/closing timing control device according to  claim 2 , wherein the biasing member has the biasing force against a displacing force acting on the driven side rotational member based on torque fluctuation of the camshaft. 
     
     
         5 . The valve opening/closing timing control device according to  claim 1 , wherein the biasing member is a spring placed between the driving side rotational member and the driven side rotational member. 
     
     
         6 . The valve opening/closing timing control device according to  claim 2 , wherein the biasing member is a spring placed between the driving side rotational member and the driven side rotational member. 
     
     
         7 . The valve opening/closing timing control device according to  claim 3 , wherein the biasing member is a spring placed between the driving side rotational member and the driven side rotational member. 
     
     
         8 . The valve opening/closing timing control device according to  claim 2 , wherein a front plate and a rear plate are fixed to the driving side rotational member, and
 both of the first biasing member and the second biasing member are disposed between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         9 . The valve opening/closing timing control device according to  claim 4 , wherein a front plate and a rear plate are fixed to the driving side rotational member, and
 both of the first biasing member and the second biasing member are disposed between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         10 . The valve opening/closing timing control device according to  claim 6 , wherein a front plate and a rear plate are fixed to the driving side rotational member, and
 both of the first biasing member and the second biasing member are disposed between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         11 . The valve opening/closing timing control device according to  claim 7 , wherein a front plate and a rear plate are fixed to the driving side rotational member, and
 both of the first biasing member and the second biasing member are disposed between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         12 . The valve opening/closing timing control device according to  claim 2 , wherein a front plate and a rear plate are fixed to the driving side rotational member,
 the first biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate, and   the second biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         13 . The valve opening/closing timing control device according to  claim 4 , wherein a front plate and a rear plate are fixed to the driving side rotational member,
 the first biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate, and   the second biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         14 . The valve opening/closing timing control device according to  claim 6 , wherein a front plate and a rear plate are fixed to the driving side rotational member,
 the first biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate, and   the second biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         15 . The valve opening/closing timing control device according to  claim 7 , wherein a front plate and a rear plate are fixed to the driving side rotational member,
 the first biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate, and   the second biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         16 . A valve opening/closing timing control device comprising:
 a driving side rotational member synchronously rotatable with a crankshaft of an internal combustion engine;   a driven side rotational member arranged coaxially with the driving side rotational member and synchronously rotatable with a camshaft that opens and closes any one of intake and exhaust valves of the internal combustion engine;   a retarded angle chamber and an advanced angle chamber formed by the driving side rotational member and the driven side rotational member, in which the retarded angle chamber moves a relative phase of the driven side rotational member to the driving side rotational member in a retarded angle direction as a volume thereof is enlarged, and the advanced angle chamber moves the relative phase in an advanced angle direction as a volume thereof is enlarged; and   a biasing member biasing the relative phase toward a predetermined phase except for a most advanced angle phase and a most retarded angle phase.   
     
     
         17 . The valve opening/closing timing control device according to  claim 8 , wherein the biasing member includes a first biasing member to bias the relative phase in a first predetermined phase which is positioned in a direction of an advanced angle phase than the most retarded angle phase, and a second biasing member to bias the relative phase in a second predetermined phase which is positioned in a direction of a retarded angle phase than the most advanced angle phase;
 the first biasing member biases the relative phase from the most retarded angle phase to the first predetermined phase and does not bias the relative phase from the first predetermined phase to the most advanced angle phase; and   the second biasing member biases the relative phase from the most advanced angle phase to the second predetermined phase and does not bias the relative phase from the second predetermined phase to the most retarded angle phase.   
     
     
         18 . The valve opening/closing timing control device according to  claim 17 , wherein a front plate and a rear plate are fixed to the driving side rotational member, and
 both of the first biasing member and the second biasing member are disposed between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.   
     
     
         19 . The valve opening/closing timing control device according to  claim 17 , wherein a front plate and a rear plate are fixed to the driving side rotational member,
 the first biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate, and   the second biasing member is disposed either between the driven side rotational member and the front plate or between the driven side rotational member and the rear plate.