Cam cap

Abstract

A cam cap may include an oil supply circuit formed to the cam cap for supplying hydraulic pressure to a continuously variable valve timing and an oil flowing backward preventing unit disposed to the oil supply circuit for preventing operation oil from flowing backward.

1 . A cam cap comprising:
 an oil supply circuit formed to the cam cap for supplying hydraulic pressure to a continuously variable valve timing; and   an oil flowing backward preventing unit disposed to the oil supply circuit for preventing operation oil from flowing backward.   
   
   
       2 . The cam cap of  claim 1 , wherein the oil flowing backward preventing unit comprises:
 a flowing backward preventing hole that comprises an inlet channel for supplying the hydraulic pressure and an outlet channel for exhausting the hydraulic pressure from the inlet channel and is disposed to the oil supply circuit; and   a flowing backward preventing member disposed in the flowing backward preventing hole and selectively blocking the flowing backward preventing hole according to a flow direction of the operation oil.   
   
   
       3 . The cam cap of  claim 2 , wherein the flowing backward preventing member includes a plunger provided with a chamber therein and at least an oil opening is formed to a side of the plunger for supplying a backward hydraulic pressure into the camber so as to move the plunger into the inlet channel when a backward flow of the operation oil occurs in the flowing backward preventing hole. 
   
   
       4 . The cam cap of  claim 2 , wherein the flowing backward preventing member comprises a plunger having a main body and a protrude portion protruded from the main body, the plunger being movably disposed in the flowing backward preventing hole such that the protrude portion selectively blocks the inlet channel according to a flow direction of the operation oil. 
   
   
       5 . The cam cap of  claim 4 , wherein the protrude portion protrudes from the main body with a predetermined thickness in a radial direction of the main body. 
   
   
       6 . The cam cap of  claim 5 , wherein the plunger is provided with a chamber therein and at least an oil opening is formed to a lateral side of the protrude portion to communicate with the camber with the flow backward preventing hole therethrough for supplying a backward hydraulic pressure into the camber when a backward flow of the operation oil occurs. 
   
   
       7 . The cam cap of  claim 6 , wherein the plunger includes an upper opening formed on an upper portion of the plunge to communicate the chamber with the flow backward preventing hole therethrough. 
   
   
       8 . The cam cap of  claim 7 , wherein an auxiliary flow channel is formed at a junction portion of the inlet channel and the outlet channel and supply the backward hydraulic pressure to the chamber through the upper opening. 
   
   
       9 . The cam cap of  claim 5 , wherein the plunger is provided with a chamber therein and includes an upper opening formed on an upper portion of the plunge to communicate the chamber with the flow backward preventing hole therethrough. 
   
   
       10 . The cam cap of  claim 9 , wherein an auxiliary flow channel is formed at a junction portion of the inlet channel and the outlet channel and supply the backward hydraulic pressure to the chamber through the upper opening. 
   
   
       11 . The cam cap of  claim 4 , wherein a lower end portion of the main body is shaped of a cone for smoothly supplying the hydraulic pressure between the inlet and outlet channels. 
   
   
       12 . The cam cap of  claim 2 , wherein the inlet channel and the outlet channel of the flowing backward preventing hole are substantially vertical to each other. 
   
   
       13 . The cam cap of  claim 2 , wherein a check valve for preventing the hydraulic pressure from being supplied from the outlet channel to the inlet channel is disposed to the flowing backward preventing portion. 
   
   
       14 . A cam cap comprising:
 an oil supply circuit formed to the cam cap for supplying hydraulic pressure to a continuously variable valve timing;   an oil control valve disposed to the cam cap to selectively supply operation oil to the continuously variable valve timing;   a flowing backward preventing hole that comprises an inlet channel for supplying the hydraulic pressure and an outlet channel for exhausting the hydraulic pressure from the inlet channel and is disposed to the oil supply circuit; and   a flowing backward preventing member disposed in the flowing backward preventing hole and selectively blocking the flowing backward preventing hole according to a flow direction of the operation oil.   
   
   
       15 . The cam cap of  claim 14 , wherein the inlet channel and the outlet channel of the flowing backward preventing hole are substantially vertical to each other. 
   
   
       16 . The cam cap of  claim 14 , wherein the flowing backward preventing member includes a plunger provided with a chamber therein and at least an oil opening is formed to a side of the plunger for supplying a backward hydraulic pressure into the camber so as to move the plunger into the inlet channel when a backward flow of the operation oil occurs in the flowing backward preventing hole. 
   
   
       17 . The cam cap of  claim 16 , wherein the plunger includes a main body and a protrude portion protruded from the main body, the plunger being movably disposed in the flowing backward preventing hole such that the protrude portion selectively blocks the inlet channel according to a flow direction of the operation oil. 
   
   
       18 . The cam cap of  claim 17 , wherein a lower end portion of the main body is shaped of a cone for smoothly supplying the hydraulic pressure between the inlet and outlet channels. 
   
   
       19 . The cam cap of  claim 14 , wherein a check valve, for preventing the hydraulic pressure from supplied from the outlet channel to the inlet channel, is disposed to the flowing backward preventing portion.