Variable valve lift apparatus

Abstract

A variable valve lift apparatus including an inner tappet, an outer tappet surrounding and slidably contacting the inner tappet, and a latching pin slidably inserted into the inner tappet so as to implement a high lift and a low lift by selectively joining the inner tappet and the outer tappet may include a stopper partially inserted into the outer tappet and spaced apart from the latching pin in a movement direction of the latching pin so as to limit movement of the latching pin, and forming a latching pin joining groove in the outer tappet to selectively receive the latching pin, wherein the stopper partially projects to the outside of the outer tappet and is slidably engaged to a cylinder head groove formed to a cylinder head bore to prevent the variable valve lift apparatus from being rotated.

1 . A variable valve lift apparatus including an inner tappet, an outer tappet surrounding and slidably contacting the inner tappet, and a latching pin slidably inserted into the inner tappet so as to implement a high lift and a low lift by selectively joining the inner tappet and the outer tappet, the apparatus comprising:
 a stopper partially inserted into the outer tappet and spaced apart from the latching pin in a movement direction of the latching pin so as to limit movement of the latching pin, and forming a latching pin joining groove in the outer tappet to selectively receive the latching pin,   wherein the stopper partially projects to the outside of the outer tappet and is slidably engaged to a cylinder head groove formed to a cylinder head bore to prevent the variable valve lift apparatus from being rotated.   
     
     
         2 . The apparatus of  claim 1 , wherein the stopper includes:
 an insertion portion having substantially the same diameter as the latching pin and being inserted into the outer tappet to limit the movement of the latching pin; and   a projection portion projecting from the insertion portion to the outside of the outer tappet and having a shape to be slidably inserted into the cylinder head groove in order to prevent the variable valve lift apparatus from being rotated.   
     
     
         3 . The apparatus of  claim 2 , wherein the projection portion has a semi-spherical shape which is slidable while contacting the cylinder head groove. 
     
     
         4 . The apparatus of  claim 2 , wherein the projection portion has a semi-cylindrical shape formed in a movement direction of the outer tappet and slides while contacting the cylinder head groove. 
     
     
         5 . The apparatus of  claim 2 , wherein a through-hole is formed in the stopper and fluid-connected to the latching pin joining groove to smoothly discharge oil pressure supplied to actuate the latching pin. 
     
     
         6 . The apparatus of  claim 2 , wherein the insertion portion has a cylindrical shape having the same radius as the latching pin.