# US 10,480,358 B2 · Continuously variable valve timing apparatus and engine provided with the same

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- Number: US 10,480,358 B2
- Document ID: US10480358B2
- Status: Granted
- Kind: B2
- Application number: 14/941,193
- Filed: 2015-11-13
- Published: 2016-12-22
- Granted: 2019-11-19
- Earliest claimed: 2015-06-22
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: You Sang Son; Kyoung Pyo Ha; Back Sik Kim
- Web page: https://patentgrep.com/patent/US10480358B2

## CPC

- F01L 1/34403: {using helically teethed sleeve or gear moving axially between crankshaft and camshaft}
- F01L 1/047: Camshafts
- F01L 1/26: characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder (with coaxial valves F01L1/28)
- F01L 1/267: {with means for varying the timing or the lift of the valves}
- F01L 13/00: Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L 13/0015: {for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque}
- F01L 2013/0052: {with cams provided on an axially slidable sleeve}
- F01L 2013/11: {Sensors for variable valve timing}
- F01L 2820/032: Electric motors
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES

## Abstract

A continuously variable valve timing apparatus may include a camshaft, a first and a second cam portions having two cams formed thereto, of which the camshaft is inserted thereinto, and of which relative phase angles with respect to the camshaft are variable. First and second inner brackets transmit rotation of the camshaft to the first and second cam portions respectively. First and second slider housings having first and second inner brackets are rotatably inserted thereinto, respectively, and have relative positions with respect to the camshaft that are variable. A cam cap rotatably supports the first and second cam portions together with a cylinder head, and the slider housings are slidably mounted thereto. A control shaft is disposed parallel with the camshaft and selectively moves the first and the second slider housings, and a control portion selectively rotates the control shaft so as to change positions of the inner brackets.

## Claims

### Claim 1

A continuously variable valve timing apparatus comprising:
a camshaft;
first and second cam portions having two cams formed thereto, the camshaft being inserted into the first and second cam portions, wherein relative phase angles with respect to the camshaft are variable;
first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions, respectively;
first and second slider housings having the first and second inner brackets rotatably inserted thereinto, respectively, and having relative positions with respect to the camshaft that are variable;
a cam cap rotatably supporting the first and second cam portions together with a cylinder head, wherein the first and second slider housings are slidably mounted to the cam cap;
a control shaft disposed parallel with the camshaft and configured to move the first and the second slider housings; and
a control portion configured to rotate the control shaft so as to change positions of the first and second inner brackets.

### Claim 2 (depends on 1)

The continuously variable valve timing apparatus of claim 1, further comprising a rotation ring mounted to the camshaft and having a ring key transmitting the rotation to the first cam portion and the second cam portion, respectively, and
wherein a cam key is formed to the first and second cam portions, respectively, and
the rotation of the rotation ring is transmitted to the first and second cam portions through the first and second inner brackets, respectively.

### Claim 3 (depends on 2)

The continuously variable valve timing apparatus of claim 2, further comprising:
first pins having a ring key slot, each ring key being slidably inserted to the ring key slots; and
second pins having a cam key slot, each cam key being slidably inserted to the cam key slots, and
wherein a first sliding pin hole and a second sliding pin hole, of which the first pin and the second pin are inserted thereto respectively, are formed in an outer surface of the first and second inner brackets, respectively.

### Claim 4 (depends on 3)

The continuously variable valve timing apparatus of claim 3, wherein:
the first pin and the second pin are formed as a circular cylinder shape; and
the first sliding pin hole and the second sliding pin hole are formed for the first pin and the second pin to be rotated therewithin.

### Claim 5 (depends on 4)

The continuously variable valve timing apparatus of claim 4, wherein parts of the first sliding pin hole and the second sliding pin hole are opened for movements of the ring key and the cam key.

### Claim 6 (depends on 1)

The continuously variable valve timing apparatus of claim 1, further comprising a first bearing inserted between the first slider housing and the first inner bracket and a second bearing inserted between the second slider housing and the second inner bracket.

### Claim 7 (depends on 1)

The continuously variable valve timing apparatus of claim 1, wherein:
a cam cap connecting portion is formed between the two cams, and
the cam cap connecting portion is rotatably disposed between the cam cap and the cylinder head.

### Claim 8 (depends on 7)

The continuously variable valve timing apparatus of claim 7, wherein:
each slider housing of the first and second slider housings includes a guide hole, and
wherein a guide rod inserted into the guide hole is connected with the cam cap to guide movements of the first and second slider housings.

### Claim 9 (depends on 1)

The continuously variable valve timing 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, and
wherein an eccentric protrusion is formed at an end of the control shaft, and a control hole where the eccentric protrusion is inserted therein is formed to the first and second slider housings, and
wherein the first and second slider housings move according to operation of the control motor.

### Claim 10 (depends on 1)

The continuously variable valve timing apparatus of claim 1, further comprising a sensor unit detecting movements of the first and second slider housings.

### Claim 11 (depends on 10)

The continuously variable valve timing apparatus of claim 10, wherein the sensor unit comprises:
a sensor plate mounted to the control shaft; and
a sensor detecting rotations of the sensor plate.

### Claim 12

An engine comprising:
a camshaft;
a first and a second cam portions having two cams are formed thereto, wherein the camshaft is inserted into the first and second cam portions such that relative phase angles with respect to the camshaft are variable, and wherein the first and second cam portions have a cam key formed thereto, respectively;
a rotation ring mounted to the camshaft and having two ring keys formed thereto;
first and second inner brackets transmitting rotation of the rotation ring to the first and second cam portions, respectively;
first and second slider housings to which the first and second inner brackets are rotatably inserted, respectively, wherein the first and second slider housings have relative positions with respect to the camshaft that are variable;
a cam cap rotatably supporting the first and second cam portions together with a cylinder head, and wherein the first and second slider housings are slidably mounted to the cam cap;
a control shaft disposed parallel with the camshaft and configured to move the first and the second slider housings; and
a control portion configured to rotate the control shaft so as to change positions of the first and second inner brackets.

### Claim 13 (depends on 12)

The engine of claim 12, 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, and
wherein an eccentric protrusion is formed to an end of the control shaft, and a control hole where the eccentric protrusion is inserted therein is formed in the first and second slider housings, and
wherein the first and second slider housings move according to operation of the control motor.

### Claim 14 (depends on 12)

The engine of claim 12, further comprising:
first pins having a ring key slot, each ring key slidably inserted to the ring key slots; and
second pins having a cam key slot, each cam key slidably inserted to the cam key slots, and
wherein a first sliding pin hole and a second sliding pin hole, of which the first pin and the second pin are inserted thereto respectively, are formed in an outer surface of the first and second inner brackets, respectively.

### Claim 15 (depends on 12)

The engine of claim 12, further comprising: a first bearing inserted between the first slider housing and the first inner bracket; and a second bearing inserted between the second slider housing and the second inner bracket.

### Claim 16 (depends on 12)

The engine of claim 12, wherein:
a cam cap connecting portion is formed between the two cams, and
the cam cap connecting portion is rotatably disposed between the cam cap and the cylinder head.

### Claim 17 (depends on 12)

The engine of claim 12, wherein:
a guide hole is formed in each slider housing of the first and second slider housings, and
wherein a guide rod inserted into the guide hole is connected with the cam cap to guide movements of the first and second slider housings.

### Claim 18 (depends on 12)

The engine of claim 12, further comprising:
a sensor plate mounted to the control shaft; and
a sensor detecting rotations of the sensor plate.