Hybrid powertrain for vehicle

Patent metadata

Field	Value
Publication number	US-11325455-B2
Application number	US-202016993637-A
Country	US
Kind code	B2
Filing date	Aug 14, 2020
Priority date	Mar 12, 2020
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A hybrid powertrain for a vehicle includes a first input shaft connected to an engine, a second input shaft connected to the engine and coaxially mounted with the first input shaft, a motor input shaft coaxially mounted with the first input shaft and connected to a motor, first and second output shafts mounted in parallel to the first input shaft and the second input shaft, first and second drive gears connected to the motor input shaft, a first driven gear engaged with the first drive gear, a second driven gear engaged with the second drive gear, a complex synchronizer to couple and separate the first input shaft and the motor input shaft and to couple and separate the first drive gear and the motor input shaft, a third clutch to couple and separate the second drive gear and the motor input shaft, and a plurality of external gear pairs configured to respectively define different gear ratios.

First claim

What is claimed is:

1. A powertrain apparatus for a vehicle, the powertrain apparatus comprising:
a first input shaft selectively connectable to an engine via a first clutch;
a second input shaft, which is selectively connectable to the engine via a second clutch and is coaxially mounted with the first input shaft;
a motor input shaft, which is coaxially mounted with the first input shaft and is connected to a motor;
first and second output shafts, which are mounted in parallel to the first input shaft and the second input shaft;
first and second drive gears, which are rotatably mounted to the motor input shaft;
a first driven gear fixedly mounted at the first output shaft to be engaged with the first drive gear;
a second driven gear fixedly mounted at the first output shaft to be engaged with the second drive gear;
a complex synchronizer configured to separately perform coupling and separation between the first input shaft and the motor input shaft and coupling and separation between the first drive gear and the motor input shaft;
a third clutch configured of selectively coupling the second drive gear and the motor input shaft; and
a plurality of gear pairs, which are configured to respectively define different gear ratios between the first input shaft and the first output shaft, between the first input shaft and the second output shaft, between the second input shaft and the first output shaft and between the second input shaft and the second output shaft,
wherein a gear ratio between the first drive gear and the first driven gear, a gear ratio between the second drive gear and the second driven gear and a plurality of gear ratios between the plurality of gear pairs form a series of gear ratios, which are employed in driving of the vehicle.

2. The powertrain apparatus according to claim 1 , wherein the complex synchronizer includes:
a hub mounted on the motor input shaft; and
first and second sleeves, which are mounted on the hub to be independently slidable in an axial direction thereof.

3. The powertrain apparatus according to claim 2 , wherein the first drive gear is integrally mounted with a first clutch gear configured for being selectively engaged with the second sleeve of the complex synchronizer.

4. The powertrain apparatus according to claim 3 ,
wherein the complex synchronizer forms a synchronizer configured for being connected to the first input shaft through synchronizing action by a synchronizer ring while the first sleeve is moved in the axial direction.

5. The powertrain apparatus according to claim 4 , wherein the second sleeve forms a dog clutch with the first clutch gear of the first drive gear.

6. The powertrain apparatus according to claim 3 ,
wherein the first drive gear and the first driven gear are configured to define a first-speed gear ratio,
wherein the second drive gear and the second driven gear are configured to define a second-speed gear ratio,
wherein the plurality of gear pairs includes a first gear pair, a second gear pair, a third gear pair and a fourth gear pair,
wherein the first gear pair between the first input shaft and the first output shaft are configured to define a fourth-speed gear ratio,
wherein the second gear pair between the first input shaft and the second output shaft are configured to define a sixth-speed gear ratio,
wherein the third gear pair between the second input shaft and the first output shaft are configured to define a fifth-speed gear ratio, and
wherein the fourth gear pair between the second input shaft and the second output shaft are configured to define a third-speed gear ratio.

7. The powertrain apparatus according to claim 6 ,
wherein the first gear pair and the second gear pair include a third drive gear in common and the first input shaft is mounted with the third drive gear, which is used in common to implement the fourth-speed gear ratio and the sixth-speed gear ratio,
wherein the third gear pair and the fourth gear pair include a fourth drive gear in common and the second input shaft is mounted with the fourth drive gear, which is used in common to implement the third-speed gear ratio and the fifth-speed gear ratio,
wherein the plurality of gear pairs further includes a fourth driven gear, a fifth driven gear, a sixth driven gear and a third driven gear,
wherein the first output shaft is mounted with the fourth driven gear, which is engaged with the third drive gear, and the fifth driven gear, which is engaged with the fourth drive gear, and
wherein the second output shaft is mounted with the sixth driven gear, which is engaged with the third drive gear, and the third driven gear, which is engaged with the fourth drive gear.

8. The powertrain apparatus according to claim 7 ,
wherein the fourth driven gear and the fifth driven gear are rotatably mounted on the first output shaft, and
wherein the sixth driven gear and the third driven gear are rotatably mounted on the second output shaft.

9. The powertrain apparatus according to claim 7 ,
wherein the third drive gear is fixedly mounted on the first input shaft such that rotation thereof is restricted by the first input shaft,
wherein the fourth drive gear is fixedly mounted on the second input shaft such that rotation thereof is restricted by the second input shaft,
wherein the first output shaft is mounted with a fourth-fifth synchronizer configured to selectively connect the fourth driven gear or the fifth driven gear to the first output shaft to restrict rotation thereof relative to the first output shaft, and
wherein the second output shaft is mounted with a third-sixth synchronizer configured to selectively connect the third driven gear or the sixth driven gear to the second output shaft to restrict rotation thereof relative to the second output shaft.

10. The powertrain apparatus according to claim 7 , wherein the third drive gear is integrally mounted with a second clutch gear, which is selectively engaged with the first sleeve of the complex synchronizer.

11. The powertrain apparatus according to claim 1 ,
wherein the first output shaft is mounted with a first output gear,
wherein the second output shaft is mounted with a second output gear, and
wherein the first output gear and the second output gear are engaged with a ring gear of a differential.

12. The powertrain apparatus according to claim 1 ,
wherein the first clutch and the second clutch form a dual clutch formed at a single clutch housing, and
wherein the second input shaft includes a hollow shaft surrounding the first input shaft.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Park Jong Yun

Classifications

• B60K6/36 Primary

  characterised by the transmission gearings · CPC title

• F16H3/085

  with more than one output shaft · CPC title

• F16H3/38

  with synchro-meshing · CPC title

• F16H2200/0052

  the gear ratios comprising six forward speeds · CPC title

• B60K6/547

  the transmission being a stepped gearing · CPC title