Power transmission apparatus for electric vehicle

Patent metadata

Field	Value
Publication number	US-10994598-B2
Application number	US-201916592946-A
Country	US
Kind code	B2
Filing date	Oct 4, 2019
Priority date	Jul 17, 2019
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A power transmission apparatus for an electric vehicle having a motor as a power source may include: first and second input shafts coaxially disposed with a motor shaft of the motor and selectively connected to the motor shaft; an output shaft disposed in parallel with the first and second input shafts; and a planetary gear set disposed on the output shaft and including: a rotation element fixedly connected to the output shaft, and two rotation elements receiving torques from the first and second input shafts through respective external gear sets.

First claim

What is claimed is:

1. A power transmission apparatus for an electric vehicle having a motor as a power source, the power transmission apparatus comprising:
first and second input shafts coaxially disposed with a motor shaft of the motor and selectively connected to the motor shaft;
an output shaft disposed in parallel with the first and second input shafts; and
a planetary gear set disposed on the output shaft and including:
first and second rotation elements receiving torques from the first and second input shafts through respective external gear sets; and
a third rotation element fixedly connected to the output shaft,

wherein:
the first input shaft is formed as a hollow shaft, disposed coaxially with and external to the motor shaft without rotational interference, and selectively connected to the motor shaft; and
the second input shaft is formed as a hollow shaft, disposed coaxially with and external to the motor shaft without rotational interference, and selectively connected to the motor shaft.

2. The power transmission apparatus of claim 1 , wherein the external gear sets comprise:
a first external gear set including a first externally-engaged drive gear and a first externally-engaged driven gear, wherein the first externally-engaged drive gear is fixedly connected to the first input shaft, and the first externally-engaged driven gear is externally gear-meshed with the first externally-engaged drive gear and fixedly connected to the first rotation element of the planetary gear set; and
a second external gear set including a second externally-engaged drive gear and a second externally-engaged driven gear, wherein the second externally-engaged drive gear is fixedly connected to the second input shaft, the second externally-engaged driven gear is externally gear-meshed with the second externally-engaged drive gear and fixedly connected to the second rotation element of the planetary gear set.

3. The power transmission apparatus of claim 1 , wherein the output shaft is fixedly connected to an output gear externally gear-meshed with a final reduction gear of a differential.

4. The power transmission apparatus of claim 1 , wherein the first rotation element of the planetary gear set is selectively connected to the third rotation element.

5. The power transmission apparatus of claim 4 , wherein:
the first, second and third rotation elements of planetary gear set respectively correspond to a sun gear, a planet carrier, and a ring gear;
the sun gear is fixedly connected to a first externally-engaged driven gear through a first connecting member and selectively connected to the ring gear;
the planet carrier is fixedly connected to a second externally-engaged driven gear through a second connecting member; and
the ring gear is fixedly connected to the output shaft through a third connecting member.

6. The power transmission apparatus of claim 5 , further comprising:
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; and
a third clutch disposed between the sun gear and the ring gear.

7. A power transmission apparatus for an electric vehicle having a motor as a power source, the power transmission apparatus comprising:
first and second input shafts coaxially disposed with a motor shaft of the motor and selectively connected to the motor shaft;
an output shaft disposed in parallel with the first and second input shafts; and
a planetary gear set having first, second, and third rotation elements and disposed on the output shaft, the first rotation element being externally gear-meshed with the first input shaft through a first external gear set, the second rotation element being externally gear-meshed with the second input shaft through a second external gear set, the third rotation element being fixedly connected to the output shaft and selectively connected to the first rotation element,
wherein:
the first input shaft is formed as a hollow shaft, disposed coaxially with and external to the motor shaft without rotational interference, and selectively connected to the motor shaft; and
the second input shaft is formed as a hollow shaft, disposed coaxially with and external to the motor shaft without rotational interference, and selectively connected to the motor shaft.

8. The power transmission apparatus of claim 7 , wherein:
the first external gear set comprises a first externally-engaged drive gear and a first externally-engaged driven gear, the first externally-engaged drive gear being fixedly connected to the first input shaft, the first externally-engaged driven gear being externally gear-meshed with the first externally-engaged drive gear and fixedly connected to the first rotation element the planetary gear set; and
the second external gear set comprises a second externally-engaged drive gear and a second externally-engaged driven gear, the second externally-engaged drive gear being fixedly connected to the second input shaft, the second externally-engaged driven gear being externally gear-meshed with the second externally-engaged drive gear and fixedly connected to the second rotation element the planetary gear set.

9. The power transmission apparatus of claim 8 , wherein the planetary gear set is a single pinion planetary gear set having a sun gear as the first rotation element, a planet carrier as the second rotation element, and a ring gear as the third rotation element.

10. The power transmission apparatus of claim 7 , wherein:
the sun gear of the planetary gear set is fixedly connected to the first externally-engaged driven gear through a first connecting member and selectively connected to the ring gear;
the planet carrier of the planetary gear set is fixedly connected to the second externally-engaged driven gear through a second connecting member; and
the ring gear of the planetary gear set is fixedly connected to the output shaft through a third connecting member.

11. The power transmission apparatus of claim 10 , further comprising:
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; and
a third clutch disposed between the sun gear and the ring gear.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Cho Wonmin
• Park Kijong
• Ji Seongwook
• Park Juhyeon
• Yoo Ilhan
• Hwang Seong Wook
• Kim Ki Tae

Classifications

• F16H3/44

  using gears having orbital motion · CPC title

• B60Y2400/73

  Planetary gearings · CPC title

• B60Y2400/42

  Clutches or brakes · CPC title

• B60Y2200/91

  Electric vehicles · CPC title

• B60K17/24

  Arrangement of mountings for shafting · CPC title