Continuous variable valve duration apparatus and engine provided with the same

Patent metadata

Field	Value
Publication number	US-10138767-B2
Application number	US-201615264449-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	Oct 22, 2015
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A continuous variable valve duration system may include a camshaft, a first cam portion including a first cam, of which a relative phase angle of the first cam with respect to the camshaft is variable, an inner bracket transmitting rotation of the camshaft to the first cam portion, a slider housing on which a control slot is formed, the slider housing being rotatable around a pivot shaft, a first rocker arm including a first end contacting the first cam and a second end connected to a first valve, a rocker shaft to which the first rocker arm is rotatably connected, and onto which an eccentric shaft inserted into the control slot is formed, a duration controller configured to rotate the rocker shaft for the slider housing to move with respect to the camshaft, and an operation mode controller configured to change a position of the pivot shaft.

First claim

What is claimed is:

1. A continuous variable valve duration system comprising:
a camshaft;
a first cam portion including a first cam, into which the camshaft is inserted and of which a relative phase angle of the first cam with respect to the camshaft is variable;
an inner bracket transmitting rotation of the camshaft to the first cam portion;
a slider housing into which the inner bracket is rotatably inserted, and on which a control slot is formed, the slider housing being rotatable around a pivot shaft;
a first rocker arm including a first end contacting the first cam and a second end connected to a first valve;
a rocker shaft to which the first rocker arm is rotatably connected, and onto which an eccentric shaft inserted into the control slot is formed;
a duration controller configured to rotate the rocker shaft for the slider housing to move with respect to the camshaft; and
an operation mode controller configured to change a position of the pivot shaft.

2. The continuous variable valve duration system of claim 1 , wherein a first slot and a second slot are formed on the inner bracket, and the first cam portion comprises a first wheel on which a first wheel key is formed, and connected to the first cam, and
wherein the continuous variable valve duration system further comprises:
a second wheel on which a second wheel key is formed, and connected to the camshaft;
a first slider pin on which a first pin hole where the first wheel key is slidably inserted thereto along a length direction of the first wheel key is formed, the first slider pin being rotatably inserted into the first slot; and
a second slider pin, on which a second pin hole where the second wheel key is slidably inserted thereto along a length direction of the second wheel key is formed, the second slider pin being rotatably inserted into the second slot.

3. The continuous variable valve duration system of claim 1 , wherein the duration controller comprises:
a duration control gear connected to the rocker shaft; and
a duration control motor configured to selectively rotate the duration control gear.

4. The continuous variable valve duration system of claim 3 , wherein the operation mode controller comprises:
a control rod rotatably connected to a cylinder head and connected to the pivot shaft;
a mode control gear connected to the control rod; and
a mode control motor engaged with the mode control gear, and selectively rotating the mode control gear to change the position of the pivot shaft.

5. The continuous variable valve duration system of claim 1 , wherein the operation mode controller comprises:
a control rod rotatably connected to a cylinder head and connected to the pivot shaft;
a mode control gear connected to the control rod; and
a mode control motor engaged with the mode control gear, and selectively rotating the mode control gear to change the position of the pivot shaft.

6. The continuous variable valve duration system of claim 1 , further comprising a bearing disposed between the slider housing and the inner bracket.

7. The continuous variable valve duration system of claim 1 , further comprising:
a first roller connected to a first end of the first rocker arm and contacting the first cam; and
a first bridge connected to the second end of the first rocker arm,
wherein the first valve formed of two first valves is connected to the first bridge as a pair of the two first valves.

8. The continuous variable valve duration system of claim 1 , further comprising an outer shaft on which a guide slot is formed and into which the camshaft is inserted,
wherein the first cam is connected to the outer shaft.

9. The continuous variable valve duration system of claim 8 , further comprising:
a second cam portion including a second cam connected to the camshaft through the guide slot; and
a second rocker arm rotatably connected to the rocker shaft, including a first end contacting the second cam and a second end connected to a second valve.

10. The continuous variable valve duration system of claim 9 , further comprising:
a second roller connected to the first end of the second rocker arm and contacting the second cam; and
a second bridge connected to the second end of the second rocker arm,
wherein the second valve formed of two second valves is connected to the second bridge as a pair of the two second valves.

11. An engine comprising:
a camshaft;
a first cam portion including a first cam, into which the camshaft is inserted and of which a relative phase angle of the first cam with respect to the camshaft is variable;
an inner bracket transmitting rotation of the camshaft to the first cam portion;
a slider housing into which the inner bracket is rotatably inserted, and on which a control slot is formed, the slider housing being rotatable around a pivot shaft;
a first rocker arm including a first end contacting the first cam, and a second end connected to a first valve;
a rocker shaft to which the first rocker arm is rotatably connected, and onto which an eccentric shaft inserted into the control slot is formed;
a duration controller configured to rotate the rocker shaft for the slider housing to move with respect to the camshaft and control opening and closing time of the first valve; and
an operation mode controller configured to change a position of the pivot shaft to control an operation mode of the first valve.

12. The engine of claim 11 , wherein the operation mode controller comprises:
a control rod rotatably connected to a cylinder head and connected to the pivot shaft;
a mode control gear connected to the control rod; and
a mode control motor engaged with the mode control gear, and selectively rotating the mode control gear to change the position of the pivot shaft.

13. The engine of claim 12 , wherein the duration controller comprises:
a duration control gear connected to the rocker shaft; and
a duration control motor configured to selectively rotate the duration control gear.

14. The engine of claim 13 , further comprising a bearing disposed between the slider housing and the inner bracket.

15. The engine of claim 13 , further comprising:
a first roller connected to a first end of the first rocker arm, and contacting the first cam; and
a first bridge connected to the second end of the first rocker arm,
wherein the first valve of two first valves is connected to the first bridge as a pair of the two first valves.

16. The engine of claim 13 , further comprising an outer shaft on which a guide slot is formed and into which the camshaft is inserted,
wherein the first cam is connected to the outer shaft.

17. The engine of claim 16 , further comprising:
a second cam portion including a second cam connected to the camshaft through the guide slot; and
a second rocker arm rotatably connected to the rocker shaft, including a first end contacting the second cam and a second end connected to a second valve.

18. The engine of claim 17 , further comprising:
a second roller connected to the first end of the second rocker arm and contacting the second cam; and
a second bridge connected to the second end of the second rocker arm,
wherein the second valve of two second valves is connected to the second bridge as a pair of the two second valves.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Kyung Mo

Classifications

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F02D13/02

  during engine operation · CPC title

• F01L2013/103

  Electric motors · CPC title

• F01L2001/0535

  Single overhead camshafts [SOHC] · CPC title

• F01L13/0026

  by means of an eccentric · CPC title