Valve opening and closing timing control device

Abstract

A valve opening and closing timing control device includes: a drive-side rotary body rotating synchronously with a crankshaft; a driven-side rotary body provided inside the drive-side rotary body coaxial with the drive-side rotary body and rotating integrally with a camshaft; advance and retard chambers formed between the drive-side and driven-side rotary bodies; a valve unit including a spool and controlling supply and discharge of fluid to and from the advance and retard chambers; a tubular valve case having an internal space extending along the rotation axis inside the driven-side rotary body and housing the valve unit; first and second drain flow paths through which the fluid is discharged from one and the other of the advance and retard chambers, respectively, through the spool. The first drain and second drain flow paths extend in directions intersecting each other at different positions in the rotation axis direction.

What is claimed is: 
     
         1 . A valve opening and closing timing control device comprising:
 a drive-side rotary body that rotates synchronously with a crankshaft of an internal combustion engine;   a driven-side rotary body that is provided inside the drive-side rotary body in a state of being coaxial with a rotation axis of the drive-side rotary body and that rotates integrally with a camshaft for opening and closing a valve;   an advance chamber and a retard chamber formed between the drive-side rotary body and the driven-side rotary body;   a valve unit that includes a spool movable in a rotation axis direction and that controls supply and discharge of fluid to and from the advance chamber and the retard chamber;   a tubular valve case that has an internal space extending along the rotation axis inside the driven-side rotary body in a radial direction and that houses the valve unit in the internal space;   a first drain flow path through which the fluid is discharged from any one of the advance chamber or the retard chamber through the spool; and   a second drain flow path through which the fluid is discharged from the other one of the advance chamber or the retard chamber through the spool, wherein   the first drain flow path and the second drain flow path extend in directions intersecting each other at different positions in the rotation axis direction.   
     
     
         2 . The valve opening and closing timing control device according to  claim 1 , wherein
 in the valve case, the first drain flow path is formed to extend in the rotation axis direction and the second drain flow path is formed to extend in a radial direction orthogonal to the rotation axis direction.   
     
     
         3 . The valve opening and closing control device according to  claim 1 , further comprising:
 a lock mechanism that restrains a relative rotation phase of the driven-side rotary body with respect to the drive-side rotary body to an intermediate phase between a most retarded phase and a most advanced phase, wherein   the fluid supplied to the lock mechanism is discharged from the first drain flow path.   
     
     
         4 . The valve opening and closing control device according to  claim 2 , further comprising:
 a lock mechanism that restrains a relative rotation phase of the driven-side rotary body with respect to the drive-side rotary body to an intermediate phase between a most retarded phase and a most advanced phase, wherein   the fluid supplied to the lock mechanism is discharged from the first drain flow path.   
     
     
         5 . The valve opening and closing control device according to  claim 1 , further comprising:
 a lock mechanism that restrains a relative rotation phase of the driven-side rotary body with respect to the drive-side rotary body to a most retarded phase or a most advanced phase, wherein   the fluid supplied to the lock mechanism is discharged from the first drain flow path.   
     
     
         6 . The valve opening and closing timing control device according to  claim 4 , wherein
 the second drain flow path includes a through hole of the valve case along a direction intersecting the rotation axis direction.   
     
     
         7 . The valve opening and closing timing control device according to  claim 5 , wherein
 the first drain flow path includes a hole portion along the rotation axis direction of the valve case.   
     
     
         8 . The valve opening and closing timing control device according to  claim 6 , wherein
 the first drain flow path includes a hole portion along the rotation axis direction of the valve case.   
     
     
         9 . The valve opening and closing timing control device according to  claim 5 , wherein
 the first drain flow path is formed between an outer end portion of the spool and the valve case.   
     
     
         10 . The valve opening and closing timing control device according to  claim 6 , wherein
 the first drain flow path is formed between an outer end portion of the spool and the valve case.   
     
     
         11 . The valve opening and closing timing control device according to  claim 1 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         12 . The valve opening and closing timing control device according to  claim 2 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         13 . The valve opening and closing timing control device according to  claim 3 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         14 . The valve opening and closing timing control device according to  claim 4 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         15 . The valve opening and closing timing control device according to  claim 5 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         16 . The valve opening and closing timing control device according to  claim 6 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         17 . The valve opening and closing timing control device according to  claim 7 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         18 . The valve opening and closing timing control device according to  claim 8 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         19 . The valve opening and closing timing control device according to  claim 9 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.   
     
     
         20 . The valve opening and closing timing control device according to  claim 10 , wherein
 when the spool is at one of a movement start position or a movement end position, the fluid is discharged from the first drain flow path, and when the spool is at the other one of the movement start position or the movement end position, the fluid is discharged from the second drain flow path.