Intermediate phase adjustment apparatus of cvvt

Abstract

The present disclosure provides an intermediate phase adjustment apparatus of a CVVT (Continuous Variable Valve Timing). This apparatus includes a pressure adjusting means balancing pressure of chambers by selectively allowing oil to be moved from a chamber at relatively high pressure to a chamber at relatively low pressure. One way to achieve this is by a pressure difference through an oil line, through which the oil can move in only one direction between the chambers.

what is claimed is: 
     
         1 . An intermediate phase adjustment apparatus of a Continuous Variable Valve Timing, the apparatus comprising:
 a pressure adjusting means balancing pressure of the chambers by selectively allowing oil to be moved from a first chamber at relatively high pressure to a second chamber at relatively low pressure by a pressure difference through the oil line through which the oil moves in only one direction between the first and second chambers.   
     
     
         2 . The apparatus of  claim 1 , wherein the pressure adjusting means comprises the oil line and a diverter valve opening or closing the oil line. 
     
     
         3 . The apparatus of  claim 2 , wherein each chamber forms an oil channel for supplying oil for operating the Continuous Variable Valve Timing, the diverter valve is disposed between the oil line and the oil channel, and the oil line and the oil channel are selectively opened or closed. 
     
     
         4 . The apparatus of  claim 2 , further comprising an elastic member and a detent valve operable to control the diverter valve and being connected to the diverter valve, the apparatus having a first state in which the detent valve generates hydraulic pressure and presses the diverter valve, and the oil line is blocked by the diverter valve, the apparatus having a second state in which the hydraulic pressure by the detent valve is removed, and the diverter valve is returned by the elastic member connected to the diverter valve so the oil channel is blocked. 
     
     
         5 . The apparatus of  claim 2 , wherein the pressure adjusting means comprises a plurality of outlets for discharging oil to corresponding chambers, the oil line having a first side forming a first outlet, and the oil line having a second side comprising check valves to prevent backward flow of oil. 
     
     
         6 . The apparatus of  claim 3 , wherein the diverter valve is disposed between the oil channel and the oil line for oil to flow into one chamber. 
     
     
         7 . The apparatus of  claim 2 , wherein one diverter valve is disposed in all of the chambers. 
     
     
         8 . The apparatus of  claim 1 , wherein each pair of chambers includes one oil line such that a plurality of oil lines are formed in all the chambers, all oil lines being connected to each other so that oil moves to pairs of chambers. 
     
     
         9 . The apparatus of  claim 2 , wherein each pair of chambers includes one oil line such that a plurality of oil lines are formed in all the chambers, all oil lines being connected to each other so that oil moves to pairs of chambers, and
 respective diverter valves are disposed in all the chambers and selectively open and close the corresponding oil lines and the corresponding oil channels to set the intermediate phase of the Continuous Variable Valve Timing by balancing pressure of the chambers to implement self-lock.   
     
     
         10 . An intermediate phase adjustment apparatus of a Continuous Variable Valve Timing, the apparatus comprising:
 advancing chambers and retarding chambers provided in pairs, an advancing oil line and an advancing oil channel are formed in the advancing chambers, a retarding oil line and a retarding oil channel are formed in the retarding chambers, a plurality of diverter valves wherein one diverter valve is disposed between each advancing oil line and each advancing oil channel, and another diverter valve being disposed between each retarding oil line and each retarding oil channel, each diverter valve operable by way of a detent valve; and   when hydraulic pressure of the advancing chambers and the retarding chambers is unbalanced, hydraulic pressure by the detent valve is removed and the respective diverter valve opens the respective oil line, so oil moves from a first chamber at relatively high pressure to a second chamber at relatively low pressure, when the hydraulic pressure is balanced, an intermediate phase is formed, and self-lock is implemented.   
     
     
         11 . An intermediate phase adjustment apparatus of a Continuous Variable Valve Timing, the apparatus comprising:
 a pressure adjusting member comprising a plurality of chambers having a first chamber and a second chamber, each chamber containing oil, the pressure adjusting member comprising an oil line and balancing pressure of the chambers by selectively allowing oil to be moved from the first chamber at relatively high pressure to the second chamber at relatively low pressure by a pressure difference through the oil line through which the oil moves in only one direction between the first and second chambers.   
     
     
         12 . The apparatus of  claim 11 , wherein the pressure adjusting member comprises a diverter valve opening or closing the oil line. 
     
     
         13 . The apparatus of  claim 12 , wherein each chamber forms an oil channel for supplying oil for operating the Continuous Variable Valve Timing, the diverter valve is disposed between the oil line and the oil channel, and the oil line and the oil channel are selectively opened or closed. 
     
     
         14 . The apparatus of  claim 12 , further comprising an elastic member and a detent valve operable to control the diverter valve and being connected to the diverter valve, the apparatus having a first state in which the detent valve generates hydraulic pressure and presses the diverter valve, and the oil line is blocked by the diverter valve, the apparatus having a second state in which the hydraulic pressure by the detent valve is removed, and the diverter valve is returned by the elastic member connected to the diverter valve so the oil channel is blocked. 
     
     
         15 . The apparatus of  claim 12 , wherein the pressure adjusting member comprises a plurality of outlets for discharging oil to corresponding chambers, the oil line having a first side forming a first outlet, and the oil line having a second side comprising check valves to prevent backward flow of oil. 
     
     
         16 . The apparatus of  claim 13 , wherein the diverter valve is disposed between the oil channel and the oil line for oil to flow into one chamber. 
     
     
         17 . The apparatus of  claim 12 , wherein one diverter valve is disposed in all of the chambers. 
     
     
         18 . The apparatus of  claim 11 , wherein each pair of chambers includes one oil line such that a plurality of oil lines are formed in all the chambers, all oil lines being connected to each other so that oil moves to pairs of chambers. 
     
     
         19 . The apparatus of  claim 12 , wherein each pair of chambers includes one oil line such that a plurality of oil lines are formed in all the chambers, all oil lines being connected to each other so that oil moves to pairs of chambers, and
 respective diverter valves are disposed in all the chambers and selectively open and close the corresponding oil lines and the corresponding oil channels to set the intermediate phase of the Continuous Variable Valve Timing by balancing pressure of the chambers to implement self-lock.