# US 10,766,352 B2 · Power transmission apparatus for a vehicle

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- Number: US 10,766,352 B2
- Document ID: US10766352B2
- Status: Granted
- Kind: B2
- Application number: 16/185,332
- Filed: 2018-11-09
- Published: 2020-02-13
- Granted: 2020-09-08
- Earliest claimed: 2018-08-07
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Juhyeon Park; Yong Uk Shin; Seongwook Ji; Wonmin Cho; Hyun Sik Kwon; Ilhan Yoo; Seong Wook Hwang; Ki Tae Kim
- Web page: https://patentgrep.com/patent/US10766352B2

## CPC

- B60K 6/547: the transmission being a stepped gearing
- F16H 3/006: {power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions}
- B60K 6/365: with the gears having orbital motion
- B60K 6/387: Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
- B60K 6/48: Parallel type
- F16H 3/093: with two or more countershafts
- F16H 3/54: one of the central gears being internally toothed and the other externally toothed
- F16H 3/724: {using externally powered electric machines}
- F16H 37/0826: {with only one output shaft}
- F16H 37/0833: {with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths}
- B60K 2006/4825: {Electric machine connected or connectable to gearbox input shaft}
- B60Y 2200/92: Hybrid vehicles
- F16H 2200/0065: the gear ratios comprising nine forward speeds
- Y02T 10/62: Hybrid vehicles
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- F16H: GEARING
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power transmission apparatus for a vehicle may include: first, second, and third input shafts disposed coaxially with each other and each selectively connected with a motor/generator; a torque mediating shaft disposed coaxially with the first input shaft; a first intermediate shaft in parallel with the first input shaft; a second intermediate shaft in parallel with the first input shaft, and selectively connected with a transmission housing; a first shifting section including five gear sets, selectively receiving torques through the first and third input shafts, and providing intermediate shift-stages; and a second shifting section including a planetary gear set, forming an output torque by combination of torques from the first shifting section and the second input shaft, and outputting the output torque to the output shaft through one gear set.

## Claims

### Claim 1

A power transmission apparatus for a vehicle having an engine and a motor/generator, the power transmission apparatus comprising:
a first input shaft selectively connected with the motor/generator;
a second input shaft formed as a hollow shaft, disposed coaxially with and external to the first input shaft without rotational interference, and selectively connected with the motor/generator;
a third input shaft formed as a hollow shaft, disposed coaxially with and external to the second input shaft without rotational interference, and selectively connected with the motor/generator;
a torque mediating shaft formed as a hollow shaft disposed coaxially with and external to the first input shaft without rotational interference;
a first intermediate shaft disposed in parallel with the first input shaft;
a second intermediate shaft disposed in parallel with the first input shaft, and selectively connected with a transmission housing;
a first shifting section including a first gear set, a second gear set, a third gear set, a fourth gear set, and a fifth gear set, each of which is disposed on at least one corresponding shaft among the first input shaft, the third input shaft, the first intermediate shaft, the second intermediate shaft, and the torque mediating shaft, where the first shifting section is configured to selectively receive a first torque through the first and third input shafts and to provide a plurality of intermediate shift-stages shifted from the received first torque;
a second shifting section including a planetary gear set having a sun gear fixedly connected with the torque mediating shaft, forming an output torque by combination of a second torque selectively transmitted from the first shifting section and a third torque selectively input through the second input shaft, the second shifting section configured to output the output torque to an output shaft through one gear set selected among the first, second, third, fourth and fifth gear sets of the first shifting section; and
wherein the output shaft is disposed coaxially with and selectively connected with the second intermediate shaft and outputs a fourth torque received from the first and second shifting sections.

### Claim 2 (depends on 1)

The power transmission apparatus of claim 1, wherein the first gear set includes:
a first drive gear fixedly connected with the third input shaft; and
a first driven gear fixedly connected with the first intermediate shaft and externally gear-meshed with the first drive gear,
wherein the second gear set includes:
a second drive gear disposed coaxial with and external to the first intermediate shaft without rotational interference;
an intermediate gear fixedly connected with the torque mediating shaft and externally gear-meshed with the second drive gear; and
a second driven gear fixedly connected with the second intermediate shaft and externally gear-meshed with the intermediate gear,
wherein the third gear set includes:
a third drive gear fixedly connected with the first input shaft; and
a third driven gear rotatably disposed on an external circumference of the second intermediate shaft without rotational interference and externally gear-meshed with the third drive gear,
wherein the fourth gear set includes:
a fourth drive gear fixedly connected with the first input shaft; and
a fourth driven gear rotatably disposed on an external circumference of the second intermediate shaft without rotational interference and externally gear-meshed with the fourth drive gear, and
wherein the fifth gear set includes:
a fifth drive gear disposed coaxial with and external to the first intermediate shaft without rotational interference; and
a fifth driven gear fixedly connected with the second intermediate shaft and externally gear-meshed with the fifth drive gear.

### Claim 3 (depends on 2)

The power transmission apparatus of claim 2, wherein:
the third driven gear and the fourth driven gear are selectively connected with the second intermediate shaft through a first synchronizer; and
the second drive gear and the fifth drive gear are selectively connected with the first intermediate shaft through a second synchronizer.

### Claim 4 (depends on 2)

The power transmission apparatus of claim 2, wherein:
gear ratios of the first gear set and the second gear set are configured to provide a forward second speed and a forward sixth speed;
a gear ratio of the third gear set is configured to provide a forward first speed and a forward seventh speed;
a gear ratio of the fourth gear set is configured to provide a forward third speed and a forward fifth speed; and
a gear ratio of the fifth gear set is configured to provide a forward ninth speed and a reverse speed in cooperation with the gear ratio of the first gear set.

### Claim 5 (depends on 1)

The power transmission apparatus of claim 1, wherein:
the sun gear of the planetary gear set is fixedly connected with the torque mediating shaft;
a planet carrier of the planetary gear set is fixedly connected with the second input shaft; and
a ring gear of the planetary gear set is externally gear-meshed with the output shaft through a sixth gear set.

### Claim 6 (depends on 5)

The power transmission apparatus of claim 5, wherein the sixth gear set comprises:
a sixth drive gear fixedly connected with the ring gear of the planetary gear set; and
a sixth driven gear fixedly connected with the output shaft and externally gear-meshed with the sixth drive gear.

### Claim 7 (depends on 5)

The power transmission apparatus of claim 5, wherein the planetary gear set is a single pinion planetary gear set.

### Claim 8 (depends on 1)

The power transmission apparatus of claim 1, further comprising:
five clutches each selectively connecting a corresponding pair among the first, second and third input shafts, the torque mediating shaft, and the first and second intermediate shafts; and
a brake selectively connecting a corresponding shaft selected among the first, second and third input shafts, the torque mediating shaft, and the first and second intermediate shafts to the transmission housing.

### Claim 9 (depends on 8)

The power transmission apparatus of claim 8,
wherein the five clutches comprise:
an engine clutch arranged between an engine output shaft of the engine and a motor shaft of the motor/generator;
a first clutch arranged between the motor shaft and the first input shaft;
a second clutch arranged between the motor shaft and the second input shaft;
a third clutch arranged between the motor shaft and the third input shaft; and
a fourth clutch arranged between the second intermediate shaft and the output shaft,
wherein the brake is arranged between the second intermediate shaft and the transmission housing.

### Claim 10 (depends on 1)

The power transmission apparatus of claim 1, wherein the second shifting section is disposed closer to the engine than the second, third, fourth, and fifth gear sets of the first shifting section.