Power transmission apparatus of a hybrid electric vehicle

Patent metadata

Field	Value
Publication number	US-2020062102-A1
Application number	US-201816204898-A
Country	US
Kind code	A1
Filing date	Nov 29, 2018
Priority date	Aug 22, 2018
Publication date	Feb 27, 2020
Grant date	—

Abstract

A power transmission apparatus of a hybrid electric vehicle may include an input shaft receiving an engine torque, an output shaft disposed at a same axis with the input shaft and outputting a shifted torque, first and second motor/generators, a first shifting section including a compound planetary gear set formed as a combination of first and second planetary gear sets, forming an adjusted torque from the engine torque received through two paths and torques of the first and second motor/generators, and outputting the adjusted torque, and a second shifting section including a third planetary gear set and outputting a shifted torque of two stages from a torque received from the first shifting section to the output shaft.

First claim

What is claimed is:

1 . A power transmission apparatus of a hybrid electric vehicle, the power transmission apparatus comprising:
an input shaft receiving an engine torque output from an engine; an output shaft mounted at a same axis with the input shaft and outputting a shifted torque; first and second motor/generators; a first shifting section engaged to the first and second motor/generators and including a compound planetary gear set formed as a combination of first and second planetary gear sets, forming an adjusted torque from the engine torque received through two paths and torques of the first and second motor/generators, and outputting the adjusted torque; and a second shifting section engaged to the first shifting section and the first and second motor/generators and including a third planetary gear set and outputting the shifted torque of two stages from a torque received from the first shifting section to the output shaft.

2 . The power transmission apparatus of claim 1 ,
wherein the compound planetary gear set forms a first rotation element, a second rotation element, a third rotation element, and a fourth rotation element by combination of the first and second planetary gear sets; wherein the third planetary gear set forms a fifth rotation element, a sixth rotation element, and a seventh rotation element; and wherein the power transmission apparatus further includes:
a first shaft fixedly connected to the third rotation element and selectively connectable to the input shaft;
a second shaft fixedly connected to the second rotation element and selectively connectable to the input shaft;
a third shaft fixedly connected to the sixth rotation element and fixedly connected to the output shaft;
a fourth shaft fixedly connected to the fourth rotation element and the fifth rotation element; and
a plurality of shafts each connecting a corresponding rotation element fixedly or selectively to at least one of a transmission housing and the first and second motor/generators, wherein the corresponding rotation element is a rotation element of the first, second, and third planetary gear sets which is not interconnected to other rotation element of the first, second, and third planetary gear sets.

3 . The power transmission apparatus of claim 2 , wherein the plurality of shafts includes:
a fifth shaft fixedly connected to the first rotation element and the first motor/generator and selectively connectable to the transmission housing; and a sixth shaft fixedly connected to the seventh rotation element and selectively connectable to the transmission housing, wherein the third shaft and the fourth shaft are selectively connectable to each other.

4 . The power transmission apparatus of claim 3 , further including:
three clutches each selectively connecting a corresponding pair among the first to fourth shafts; and two brakes selectively connecting the fifth shaft and the sixth shaft to the transmission housing.

5 . The power transmission apparatus of claim 4 ,
wherein the three clutches comprise:
a first clutch mounted between the input shaft and the first shaft;
a second clutch mounted between the input shaft and the second shaft; and
a third clutch mounted between the third shaft and the fourth shaft,
wherein the two brakes comprise:
a first brake mounted between the fifth shaft and the transmission housing; and
a second brake mounted between the sixth shaft and the transmission housing.

6 . The power transmission apparatus of claim 1 ,
wherein the first planetary gear set is a single pinion planetary gear set having a first sun gear, a common planet carrier, and a common ring gear; wherein the second planetary gear set is a double pinion planetary gear set having a first sun gear, the common planet carrier, and the common ring gear; wherein the compound planetary gear set forms a first rotation element, a second rotation element, a third rotation element, and a fourth rotation element as the first sun gear, the second sun gear, the common planet carrier, and the common ring gear respectively; and wherein the third planetary gear set is a single pinion planetary gear set having a third sun gear, a third planet carrier, and a third ring gear that form a fifth rotation element, a sixth rotation element, and a seventh rotation element, respectively.

7 . The power transmission apparatus of claim 2 , wherein the input shaft is limited to rotate to a direction by a one-way clutch mounted between the input shaft and the transmission housing.

8 . The power transmission apparatus of claim 2 , wherein the first shaft is limited to rotate to a direction by a one-way clutch mounted between the first shaft and the transmission housing.

9 . The power transmission apparatus of claim 2 , wherein the plurality of shafts includes:
a fourth shaft fixedly connected to the fourth rotation element and the fifth rotation element; a fifth shaft fixedly connected to the first rotation element and the first motor/generator and selectively connectable to the transmission housing; and a sixth shaft fixedly connected to the seventh rotation element and selectively connectable to the transmission housing, wherein the third shaft and the fourth shaft are selectively connectable to each other.

10 . The power transmission apparatus of claim 9 , further including:
a first clutch mounted between the input shaft and the first shaft; a second clutch mounted between the input shaft and the second shaft; a third clutch mounted between the third shaft and the fourth shaft; a first brake mounted between the fifth shaft and the transmission housing; and a second brake mounted between the sixth shaft and the transmission housing.

11 . A power transmission apparatus of a hybrid electric vehicle, the power transmission apparatus comprising:
an input shaft receiving an engine torque; an output shaft mounted at a same axis with the input shaft and outputting a shifted torque; first and second motor/generators; a compound planetary gear set forming first, second, third, and fourth rotation elements by a combination of first and second planetary gear sets; a third planetary gear set forming a fifth rotation element, a sixth rotation element, and a seventh rotation element; a first shaft fixedly connected to the third rotation element and selectively connectable to the input shaft; a second shaft fixedly connected to the second rotation element and selectively connectable to the input shaft; a third shaft fixedly connected to the sixth rotation element and fixedly connected to the output shaft; a fourth shaft fixedly connected to the fourth rotation element and the fifth rotation element; a plurality of shafts each connecting a corresponding rotation element fixedly or selectively to at least one of a transmission housing and the first and second motor/generators, wherein the corresponding rotation element is a rotation element of the first, second, and third planetary gear sets which is not interconnected to other rotation element of the first, second, and third planetary gear sets; three clutches each selectively connecting a corresponding pair among the first to fourth shafts; and two brakes each selectively connecting a corresponding shaft among the fifth and sixth shafts to the transmission housing.

12 . The power transmission apparatus of claim 11 , wherein the plurality of shafts includes:
a fifth shaft fixedly connected to the first rotation element and the first motor/generator and selectively connectable to the transmission housing; and a sixth shaft fixedly connected to the seventh rotation element and selectively co

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Kim Wan Soo
• Kim Tal Chol
• Choi Yeongil
• Kim Yeonho
• Kim Kyungha
• Kim Shin Jong

Classifications

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H2003/445

  without permanent connection between the input and the set of orbital gears · CPC title

• B60K6/365 Primary

  with the gears having orbital motion · CPC title

• F16H2200/2007

  with two sets of orbital gears · CPC title