Direct acting variable valve lift apparatus

Abstract

The present invention provides a variable valve lift apparatus including an outer body in which a hole is formed horizontally, and that moves upward/downward while slidingly contacting a high cam, an inner body that is inserted in the outer body, a hole is formed in steps such that the hole of the inner body is connected with the hole of the outer body, and moves upward/downward while slidingly contacting a low cam, a latching device that is inserted in the holes of the outer body and the inner body, and causes the movement of the outer body to be selectively dependent on the movement of the inner body, a plate that is located at a side of the latching device such that oil discharge from the outer body can be prevented, an upper seat that partially covers the inner body, and in which an oil passage is formed, and a lost motion spring that is located in the upper seat and provides the outer body with elastic force.

1 . A variable valve lift apparatus comprising:
 an outer body including a horizontally extending hole, and that moves upward/downward while slidingly contacting a high cam;   an inner body inserted in the outer body, a hole is formed therein in steps such that the hole of the inner body is connected with the hole of the outer body, and moves upward/downward while slidingly contacting a low cam;   a latching device inserted in the holes of the outer body and the inner body, and causes the movement of the outer body to be selectively dependent on the movement of the inner body;   a plate located at a side of the latching device such that oil discharge from the outer body can be prevented;   an upper seat that partially covers the inner body, and includes an oil passage; and   a lost motion spring located in the upper seat and providing the outer body with elastic force.   
     
     
         2 . A variable valve lift apparatus of  claim 1 , wherein the latching device comprises a plunger that moves from side to side by selective oil supply, a latching pin of which one side thereof contacts the plunger and an other side thereof is formed in steps such that the latching pin is blocked by the stepped holes of the outer body and the inner body, and a latching spring that covers the latching pin and provides the latching pin with elastic force while being supported by the supporting portion of the outer body. 
     
     
         3 . A variable valve lift apparatus of  claim 2 , wherein the latching pin is formed with two steps, and the inner diameter of the outer body is smaller than the diameter of the end in the other side of the latching pin such that a stepped jaw is formed to prevent the latching pin from moving. 
     
     
         4 . A variable valve lift apparatus of  claim 2 , wherein the latching pin is formed with three steps, and the inner diameter of the inner body is smaller than the diameter of the second protruded portion in the latching pin at which a stepped portion is formed to prevent the latching pin from moving. 
     
     
         5 . A variable valve lift apparatus of  claim 2 , wherein a protrusion is formed at a side of the plunger. 
     
     
         6 . A variable valve lift apparatus of  claim 1 , wherein the oil passage formed in the upper seat is inclined, and is connected with a latching device insertion hole formed in the outer body. 
     
     
         7 . A variable valve lift apparatus of  claim 2 , wherein the oil passage formed in the upper seat is slanted, and is connected with a latching device insertion hole formed in the outer body. 
     
     
         8 . A variable valve lift apparatus of  claim 7 , wherein a shim contacting a valve is disposed at the bottom of the inner body. 
     
     
         9 . A variable valve lift apparatus comprising:
 an outer body including a horizontally extending oil chamber and a protruded portion formed inward and moves upward/downward while slidingly contacting a cam;   an inner body inserted in the outer body, a latching pin hole is formed to be connected with the oil chamber of the outer body, and moves upward/downward while slidingly contacting a low cam;   at least one latching device that moves through the latching pin hole and the oil chamber and causes the movement of the outer body to be selectively dependent on the movement of the inner body;   a plate located at a side of the latching device such that discharge of the oil from the outer body is prevented;   an upper seat that partially covers the inner body and in which an oil passage is formed; and   a lost motion spring located in the upper seat, and provides the outer body with elastic force.   
     
     
         10 . A variable valve lift apparatus of  claim 9 , wherein the latching device is comprised of a latching pin of which a side thereof contacts oil and an other side thereof moves into the inner body by selective oil supply, and a latching spring that partially covers the latching pin and provides the latching pin with elastic force. 
     
     
         11 . A variable valve lift apparatus of  claim 10 , wherein the latching device is respectively located at both ends of the latching pin hole of the inner body. 
     
     
         12 . A variable valve lift apparatus of  claim 10 , wherein an inner diameter of the other side in the latching pin is the same size as the diameter of the latching pin hole of the inner body. 
     
     
         13 . A variable valve lift apparatus of  claim 10 , wherein the latching spring is located between the protruded portion of the outer body formed in a step, and the jaw of the latching pin. 
     
     
         14 . A variable valve lift apparatus of  claim 10 , wherein a protrusion is formed at a side of the latching pin. 
     
     
         15 . A variable valve lift apparatus of  claim 9 , wherein the oil passage formed in the upper seat is connected with an oil chamber formed in the outer body. 
     
     
         16 . A variable valve lift apparatus of  claim 10 , wherein the oil passage formed in the upper seat is connected with an oil chamber formed in the outer body. 
     
     
         17 . A variable valve lift apparatus of  claim 16 , wherein the outer body and the upper seat are integrally formed. 
     
     
         18 . A variable valve lift apparatus of  claim 1 , wherein the outer body and the upper seat are integrally formed. 
     
     
         19 . A variable valve lift apparatus of  claim 16 , wherein the outer body and the upper seat are integrally formed.