# US 9,518,633 B2 · Power transmission apparatus for vehicle

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- Number: US 9,518,633 B2
- Document ID: US9518633B2
- Status: Granted
- Kind: B2
- Application number: 14/559,608
- Filed: 2014-12-03
- Published: 2016-04-21
- Granted: 2016-12-13
- Earliest claimed: 2014-10-17
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Suengho Lee; Kyeonghun Lee; Jongmin Kim; Changyeon Cho; Jonghyo Park; Minjun Song; Jongsool Park; Byunghyun Lee; Seongwook Hwang
- Web page: https://patentgrep.com/patent/US9518633B2

## CPC

- F16H 3/006: {power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions}
- F16H 2003/0822: {characterised by the arrangement of at least one reverse gear}
- F16H 2003/0826: {wherein at least one gear on the input shaft, or on a countershaft is used for two different forward gear ratios}
- F16H 2003/0931: {each countershaft having an output gear meshing with a single common gear on the output shaft}
- F16H 2200/0056: the gear ratios comprising seven forward speeds
- F16H: GEARING

## Abstract

A power transmission apparatus may include first and second input shafts; first and second clutches; first and second output shafts; first set of input gears fixed on first input shaft; second set of input gears fixed on second input shaft; first set of speed gears rotatable on first output shaft and engaged with first set of input gears or second set of input gears; second set of speed gears rotatable on second output shaft and engaged with first or second set of input gears; first set of synchronizers selectively connecting first set of speed gears to first output shaft; second set of synchronizers selectively connecting second set of speed gears to second output shaft; and reverse speed output unit engaged with one input gear of first and second sets of input gears, and second idle gear engaged with one speed gear of first and second sets of speed gears.

## Claims

### Claim 1

A power transmission apparatus for a vehicle comprising:
a first input shaft selectively connected to a power source through a first clutch;
a second input shaft selectively connected to the power source through a second clutch;
first and second output shafts disposed in parallel with the first and second input shafts;
a first set of input gears fixedly disposed on the first input shaft and including first, second, third, and fourth input gears;
a second set of input gears fixedly disposed on the second input shaft and including fifth and sixth input gears;
a first set of speed gears rotatably disposed on the first output shaft and including a first speed gear engaged with the second input gear, a second speed gear engaged with the fifth input gear, a fourth speed gear engaged with the sixth input gear, and a fifth speed gear engaged with the fourth input gear;
a second set of speed gears rotatably disposed on the second output shaft and including a third speed gear engaged with the third input gear, a sixth speed gear engaged with the sixth input gear, and a seventh speed gear engaged with the first input gear;
a first set of synchronizers including a first synchronizer selectively connecting the first speed gear or the fifth speed gear to the first output shaft, and a second synchronizer selectively connecting the second speed gear or the fourth speed gear to the first output shaft;
a second set of synchronizers including a third synchronizer selectively connecting the third speed gear or the seventh speed gear to the second output shaft, and a fourth synchronizer selectively connecting the sixth speed gear to the second output shaft; and
a reverse speed output unit including a reverse idle shaft disposed in parallel with the first and second output shafts, a first idle gear engaged with the first input gear, and a second idle gear engaged with the second speed gear or the fourth speed gear,
wherein one of the first idle gear and the second idle gear is fixedly disposed on the reverse idle shaft and another of the first idle gear and the second idle gear is rotatably disposed on the reverse idle shaft, and
wherein the reverse speed output unit includes a further synchronizer selectively connecting the another of the first idle gear and the second idle gear to the reverse idle shaft.

### Claim 2 (depends on 1)

The power transmission apparatus of claim 1, wherein the first idle gear is engaged with the first input gear and the second idle gear is engaged with the second speed gear.

### Claim 3 (depends on 2)

The power transmission apparatus of claim 2, wherein the first idle gear is rotatably disposed on the reverse idle shaft and the second idle gear is fixedly disposed on the reverse idle shaft.

### Claim 4 (depends on 1)

The power transmission apparatus of claim 1, wherein the first idle gear is engaged with the first input gear and the second idle gear is engaged with the fourth speed gear.

### Claim 5 (depends on 4)

The power transmission apparatus of claim 4, wherein the first idle gear is fixedly disposed on the reverse idle shaft and the second idle gear is rotatably disposed on the reverse idle shaft.

### Claim 6 (depends on 1)

The power transmission apparatus of claim 1, further comprising:
a first output gear fixedly disposed on the first output shaft and outputting torque of the first output shaft; and
a second output gear fixedly disposed on the second output shaft and outputting torque of the second output shaft.

### Claim 7

A power transmission apparatus for a vehicle comprising:
a first input shaft selectively connected to a power source through a first clutch and having first, second, third, and fourth input gears fixedly disposed thereon;
a second input shaft selectively connected to the power source through a second clutch and having fifth and sixth input gears fixedly disposed thereon;
a first output shaft disposed in parallel with the first and second input shafts and having a first speed gear engaged with the second input gear, a second speed gear engaged with the fifth input gear, a fourth speed gear engaged with the sixth input gear, and a fifth speed gear engaged with the fourth input gear;
a second output shaft disposed in parallel with the first and second input shafts and having a third speed gear engaged with the third input gear, a sixth speed gear engaged with the sixth input gear, and a seventh speed gear engaged with the first input gear;
a first synchronizer selectively connecting the first speed gear or the fifth speed gear to the first output shaft;
a second synchronizer selectively connecting the second speed gear or the fourth speed gear to the first output shaft;
a third synchronizer selectively connecting the third speed gear or the seventh speed gear to the second output shaft; and
a fourth synchronizer selectively connecting the sixth speed gear to the second output shaft;
a reverse speed output unit including a reverse idle shaft disposed in parallel with the first and second output shafts, a first idle gear engaged with the first input gear, and a second idle gear engaged with the second speed gear or the fourth speed gear,
wherein one of the first idle gear and the second idle gear is fixedly disposed on the reverse idle shaft and another of the first idle gear and the second idle gear is rotatably disposed on the reverse idle shaft, and
wherein the reverse speed output unit includes a further synchronizer selectively connecting the another of the first idle gear and the second idle gear to the reverse idle shaft.

### Claim 8 (depends on 7)

The power transmission apparatus of claim 7, wherein the first idle gear is engaged with the first input gear and the second idle gear is engaged with the second speed gear.

### Claim 9 (depends on 8)

The power transmission apparatus of claim 8, wherein the first idle gear is rotatably disposed on the reverse idle shaft and the second idle gear is fixedly disposed on the reverse idle shaft.

### Claim 10 (depends on 7)

The power transmission apparatus of claim 7, wherein the first idle gear is engaged with the first input gear and the second idle gear is engaged with the fourth speed gear.

### Claim 11 (depends on 10)

The power transmission system of claim 10, wherein the first idle gear is fixedly disposed on the reverse idle shaft and the second idle gear is rotatably disposed on the reverse idle shaft.

### Claim 12 (depends on 7)

The power transmission apparatus of claim 7, further comprising:
a first output gear fixedly disposed on the first output shaft and outputting torque of the first output shaft; and
a second output gear fixedly disposed on the second output shaft and outputting torque of the second output shaft.