Continuous variable valve duration apparatus and engine provided with the continuous variable valve duration apparatus

Patent metadata

Field	Value
Publication number	US-10138764-B2
Application number	US-201615369285-A
Country	US
Kind code	B2
Filing date	Dec 5, 2016
Priority date	Mar 31, 2016
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A continuous variable valve duration apparatus includes a camshaft, a first and second cam portion, each including a cam and a cam key, where the camshaft is inserted into the first and second cam portions and where relative phase angles with respect to the camshaft are variable, a first and second inner bracket transmitting a rotation of the camshaft to the first and second cam portions respectively, a first and second slider housing, a cam cap rotatably supporting the first and second cam portions respectively, a slider pin rotatably inserted into the first sliding hole and slidably inserted into the camshaft, a cam pin on which a cam key slot for the cam key to be slidably inserted thereinto is formed, a control shaft disposed parallel to the camshaft and engaged with the first and second slider housings, and a control portion selectively rotating the control shaft.

First claim

What is claimed is:

1. A continuous variable valve duration apparatus comprising:
a camshaft;
a first and second cam portion, each including a cam and a cam key, where the camshaft is inserted into the first and second cam portions and where relative phase angles with respect to the camshaft are variable;
a first and second inner bracket transmitting a rotation of the camshaft to the first and second cam portions respectively and on which a first and a second sliding hole are formed respectively;
a first and second slider housing into which the first and second inner bracket are rotatably inserted, and where relative positions of the first and second slider housings with respect to the camshaft are variable;
a cam cap rotatably supporting the first and second cam portions respectively and where each slider housing is slidably mounted to a cam cap;
a slider pin rotatably inserted into the first sliding hole and slidably inserted into the camshaft;
a cam pin on which a cam key slot for the cam key to be slidably inserted thereinto is formed and rotatably inserted into the second sliding hole;
a control shaft disposed parallel to the camshaft and engaged with the first and second slider housings for selectively moving the first and second slider housings; and
a control portion selectively rotating the control shaft for changing positions of the first and the second inner brackets.

2. The continuous variable valve duration apparatus of claim 1 , wherein the slider pin comprises:
a pin body slidably inserted into the camshaft; and
a pin head rotatably inserted into the first sliding hole,
wherein the pin body and the pin head are integrally formed.

3. The continuous variable valve duration apparatus of claim 2 , wherein:
a camshaft oil hole is formed in the camshaft along a length direction thereof,
a body oil hole is formed in the pin body and configured to communicate with the camshaft oil hole and
an oil groove is formed in the pin head and configured to communicate with the body oil hole.

4. The continuous variable valve duration apparatus of claim 1 , wherein a shaft hole where the control shaft is inserted into is formed on the cam cap.

5. The continuous variable valve duration apparatus of claim 4 , further comprising a shaft bearing inserted into the shaft hole and rotatably supporting the control shaft.

6. The continuous variable valve duration apparatus of claim 1 , wherein:
a guide slot is formed on the cam cap;
a guide shaft inserted into the guide slot and of which a rack gear is formed thereon is protruded from the slider housing; and
a pinion gear is formed on the control shaft and engaged with the rack gear; and
wherein the positions of the slider housings are changed according to rotations of the control shaft.

7. The continuous variable valve duration apparatus of claim 6 , further comprising a bushing inserted into the guide slot for reducing frictional forces of the movement of the guide shaft.

8. The continuous variable valve duration apparatus of claim 6 , further comprising a stopper disposed on the cam cap for limiting the movement of the slider housing.

9. The continuous variable valve duration apparatus of claim 1 , further comprising a slider housing bearing disposed between the slider housing and the first and second inner brackets respectively.

10. The continuous variable valve duration apparatus of claim 1 , wherein:
the cam is formed as a pair;
a cam cap connecting portion is formed between the two cams of the cam portions; and
the cam cap rotatably supports the cam cap connecting portion.

11. The continuous variable valve duration apparatus of claim 1 , wherein the control portion comprises:
a worm wheel connected to the control shaft;
a worm gear engaged with the worm wheel; and
a control motor selectively rotating the worm gear.

12. The continuous variable valve duration apparatus of claim 1 , wherein the first inner bracket and the second inner bracket are connected to each other.

13. An engine comprising:
a camshaft;
two cam portions including a first and a second cam portion, each including a cam and a cam key, where the camshaft is inserted into the first and second cam portions and where relative phase angles with respect to the camshaft are variable;
a first and a second inner bracket transmitting a rotation of the camshaft to the first and second cam portions respectively and on which a first and a second sliding hole are formed respectively;
a first and second slider housing into which the first and second inner brackets are rotatably inserted, and where relative positions of the first and second slider housings with respect to the camshaft are variable;
a cam cap rotatably supporting the first and second cam portions respectively and where each slider housing is slidably mounted to a cam cap;
a slider pin rotatably inserted into the first sliding hole and slidably inserted into the camshaft;
a cam pin on which a cam key slot for the cam key to be slidably inserted thereinto is formed and rotatably inserted into the second sliding hole;
a control shaft disposed parallel to the camshaft and engaged with the first and second slider housings for selectively moving the first and second slider housings; and
a control portion selectively rotating the control shaft for changing positions of the first and the second inner brackets.

14. The engine of claim 13 , wherein the slider pin comprises:
a pin body slidably inserted into the camshaft; and
a pin head rotatably inserted into the first sliding hole,
wherein the pin body and the pin head are integrally formed.

15. The engine of claim 14 , wherein:
a camshaft oil hole is formed in the camshaft along a length direction thereof,
a body oil hole is formed in the pin body and configured to communicate with the camshaft oil hole, and
an oil groove is formed in the pin head and configured to communicate with the body oil hole.

16. The engine of claim 13 , wherein:
a shaft hole where the control shaft is inserted into is formed to the cam cap;
the cam is formed as a pair;
a cam cap connecting portion is formed between the two cams of the cam portions; and
each cam portion is rotatable between the cam cap and the cylinder housing.

17. The engine of claim 13 , wherein:
a guide slot is formed on the cam cap;
a guide shaft inserted into the guide slot and, a rack gear formed on the guide shaft is protruded from the slider housing; and
a pinion gear is formed on the control shaft and engaged with the rack gear; and
wherein the positions of the slider housings are changed according to rotations of the control shaft.

18. The engine of claim 13 , wherein:
a guide surface is formed on the first and second slider housings; and
a guider is formed to the cylinder head for contacting the guide surface and guiding movements of the first and second slider housings.

19. The engine of claim 13 , wherein the first inner bracket and the second inner bracket are connected to each other.

Assignees

• Hyundai Motor Co Ltd

Inventors

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

Classifications

• F01M9/109

  of rotary slide or sleeve valves · CPC title

• F01M9/102 Primary

  of camshaft bearings · CPC title

• F01L1/22 Primary

  automatically, e.g. mechanically · CPC title

• F01L1/356

  making the angular relationship oscillate {, e.g. non-homokinetic drive} · CPC title

• F01L1/344

  changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear · CPC title