Continuous variable valve lift apparatus and engine provided with the same

Patent metadata

Field	Value
Publication number	US-9879572-B2
Application number	US-201514955349-A
Country	US
Kind code	B2
Filing date	Dec 1, 2015
Priority date	Sep 21, 2015
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

A continuously variable valve lift apparatus may include a camshaft, a cam portion on which a cam is formed and into which the camshaft is inserted, a slider housing into which the cam portion is rotatably inserted and a position thereof is rotatable around a pivot shaft, a control portion configured to selectively push the slider housing to be rotated, a spring guide connected to the slider housing for elastically supporting the slider housing, a rotation deliverer configured to transmit rotation of the camshaft to the cam portion, an output portion rotatable around the pivot shaft and onto which a valve shoe is formed, and a valve unit configured to be driven by the valve shoe.

First claim

What is claimed is:

1. A continuously variable valve lift apparatus comprising:
a camshaft;
a cam portion including a cam, wherein the camshaft is inserted into the cam portion;
a slider housing into which the cam portion is rotatably inserted and a position thereof is rotatable around a pivot shaft;
a control portion selectively pushing the slider housing to be rotated;
a spring guide connected to the slider housing for elastically supporting the slider housing;
a rotation deliverer transmitting rotation of the camshaft to the cam portion;
an output portion rotatable around the pivot shaft and onto which a valve shoe is formed; and
a valve unit driven by the valve shoe.

2. The continuously variable valve lift apparatus of claim 1 , wherein the rotation deliverer comprises:
a connecting pin connected to the camshaft; and
a spiral bearing mounted to the cam portion and into which the connecting pin is inserted.

3. The continuously variable valve lift apparatus of claim 2 , wherein the spiral bearing comprises:
an outer wheel connected to a rotation housing formed to the cam portion; and
an inner wheel rotatably connected to the outer wheel and in which the connecting pin is slidably disposed.

4. The continuously variable valve lift apparatus of claim 1 , further comprising a bearing disposed between the cam portion and the slider housing.

5. The continuously variable valve lift apparatus of claim 1 , wherein the output portion comprises an output roller contacting the cam.

6. The continuously variable valve lift apparatus of claim 1 , wherein the control portion comprises:
a slider lifter parallel to the camshaft; and
a control lifter connected to the slider lifter and contacting the slider housing.

7. The continuously variable valve lift apparatus of claim 1 , further comprising:
a spring bracket connected to the pivot shaft; and
a torsion spring connected to the spring bracket and configured for the output portion to be contacted by the cam.

8. The continuously variable valve lift apparatus of claim 7 , wherein the spring guide comprises:
a guide shaft connected to the spring bracket;
a connecting bracket connecting the guide shaft with the slider housing; and
a guide spring disposed between the guide shaft and the connecting bracket for elastically supporting the slider housing.

9. The continuously variable valve lift apparatus of claim 1 , wherein the valve unit is a swing arm comprising a swing arm roller contacting the valve shoe and a valve.

10. The continuously variable valve lift apparatus of claim 1 , wherein:
the slider housing is disposed as a pair rotatable around the pivot shaft;
two rotation portions disposed within each slider housing of the pair are formed to the cam portion;
the cam is formed to the cam portion as a pair;
the output portion is disposed as a pair and contacts each cam; and
the valve unit is configured as a pair and each valve unit includes a swing arm roller contacting each valve shoe of each output portion and a valve.

11. The continuously variable valve lift apparatus of claim 10 , wherein the rotation deliverer comprises:
a connecting pin connected to the camshaft; and
a spiral bearing mounted to a rotation housing formed between the cams, and into which the connecting pin is inserted, and
wherein the spiral bearing comprises:
an outer wheel connected to the rotation housing; and
an inner wheel rotatably connected to the outer wheel and in which the connecting pin is slidably disposed.

12. The continuously variable valve lift apparatus of claim 10 , further comprising a spring bracket to which the pivot shaft is rotatably connected,
wherein the spring guide comprises:
two guide shafts connected to the spring bracket;
a connecting bracket connecting each slider housing and slidably connected to each guide shaft; and
guide springs disposed between each guide shaft and the connecting bracket for elastically supporting each slider housing.

13. An engine comprising:
a camshaft;
a cam portion including a cam, wherein the camshaft is inserted into the cam portion;
a slider housing into which the cam portion is rotatably inserted, and a position thereof is rotatable around a pivot shaft;
a control portion selectively pushing the slider housing to be rotated;
a spring guide connected to the slider housing for elastically supporting the slider housing;
a rotation deliverer transmitting rotation of the camshaft to the cam portion;
an output portion rotatable around the pivot shaft and on which a valve shoe is formed; and
a valve unit driven by the valve shoe.

14. The engine of claim 13 , wherein:
the slider housing is disposed as a pair rotatable around the pivot shaft;
two rotation portions disposed within each slider housing of the pair are formed to the cam portion;
the cam is formed to inner side of the cam portion as a pair;
the rotation deliverer is disposed between the cams;
the output portion is disposed as a pair and contacts each cam;
the valve unit is configured as a pair and each valve unit includes a swing arm roller contacting each valve shoe of each output portion and a valve.

15. The engine of claim 14 , further comprising a spring bracket mounted to a cylinder head and to which the pivot shaft is rotatably connected,
wherein the spring guide comprises:
two guide shafts connected to the spring bracket;
a connecting bracket connecting each slider housing and slidably connected to each guide shaft; and
guide springs disposed between each guide shaft and the connecting bracket for elastically supporting each slider housing.

16. The engine of claim 14 , wherein the rotation deliverer comprises:
a connecting pin connected to the camshaft; and
a spiral bearing mounted to the cam portion and into which the connecting pin is inserted therein, and
wherein the spiral bearing comprises:
an outer wheel connected to a rotation housing formed to the cam portion; and
an inner wheel rotatably connected to the outer wheel and in which the connecting pin is slidably disposed.

17. The engine of claim 14 , further comprising a bearing disposed between the cam portion and the slider housing.

18. The engine of claim 14 , wherein the control portion comprises:
a slider lifter parallel to the camshaft; and
a control lifter connected to the slider lifter and contacting the slider housing.

19. The engine of claim 18 , further comprising a contact roller connected to the slider housing and contacting the control lifter.

20. The engine of claim 14 , further comprising a torsion spring connected to the spring bracket and configured for the output portion to be contacted by the cam.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Son You Sang
• Ha Kyoung Pyo
• Kim Back Sik
• Kwon Kiyoung

Classifications

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L1/267

  with means for varying the timing or the lift of the valves · CPC title

• F01L1/185

  Overhead end-pivot rocking arms · CPC title

• F01L2013/103

  Electric motors · CPC title

• F01L13/0026

  by means of an eccentric · CPC title