Power transmission system of hybrid electric vehicle

Patent metadata

Field	Value
Publication number	US-2016167501-A1
Application number	US-201514701021-A
Country	US
Kind code	A1
Filing date	Apr 30, 2015
Priority date	Dec 10, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A power transmission system may include: an engine power delivery module configured to transmit power of the engine directly to the first motor/generator as driving power for generating electricity and to selectively transmit the power of the engine as driving power for driving the vehicle, and a motor power delivery module disposed in parallel with and independently from the engine power delivery module, and configured to directly transmit power of the second motor/generator as driving power for driving the vehicle.

First claim

What is claimed is:

1 . A power transmission system of a hybrid electric vehicle that uses an engine and first and second motor/generators as power sources, comprising:
an engine power delivery module transmitting power of the engine directly to the first motor/generator as driving power for generating electricity and selectively transmitting the power of the engine as driving power for driving the vehicle; and a motor power delivery module disposed in parallel with and independently from the engine power delivery module, and directly transmitting power of the second motor/generator as driving power for driving the vehicle.

2 . The power transmission system of claim 1 , wherein the engine power delivery module comprises:
a first input shaft directly connected to the engine and receiving the power of the engine; an intermediate shaft receiving power of the first input shaft through a planetary gear set and transmitting the power of the first input shaft to the first motor/generator; and a first output shaft disposed in parallel with the first input shaft, continuously or selectively receiving the power of the first input shaft, and selectively transmitting the power of the first input shaft to a final reduction gear of a differential apparatus.

3 . The power transmission system of claim 2 , wherein the intermediate shaft is a hollow shaft and is disposed at a radial exterior of and concentrically with the first input shaft, and the planetary gear set and the first motor/generator are disposed respectively at a radial exterior of both end portions of the intermediate shaft.

4 . The power transmission system of claim 3 , wherein the planetary gear set is disposed at a rear end portion of the intermediate shaft and the first motor/generator is disposed at a front end portion of the intermediate shaft.

5 . The power transmission system of claim 4 , wherein the planetary gear set is a single pinion planetary gear set.

6 . The power transmission system of claim 4 , wherein the planetary gear set is configured to increase a rotation speed of the first input shaft and to transmit the increased rotation speed to the first motor/generator.

7 . The power transmission system of claim 5 , wherein the planetary gear set includes a sun gear directly connected to the first motor/generator, a planet carrier directly connected to the first input shaft, and a ring gear directly connected to a transmission housing.

8 . The power transmission system of claim 1 , wherein the first input shaft is provided with a first drive gear fixedly disposed on a rear end thereof and configured to output power.

9 . The power transmission system of claim 8 , wherein a first driven gear meshed with the first drive gear is fixedly disposed on a first end portion of the first output shaft, and a first output gear meshed with the final reduction gear of the differential apparatus is fixedly disposed on a second end portion of the first output shaft.

10 . The power transmission system of claim 2 , wherein a clutch selectively transmitting power or not is disposed on the first input shaft.

11 . The power transmission system of claim 2 , wherein a clutch selectively transmitting power or not is disposed on the first output shaft.

12 . The power transmission system of claim 2 , wherein the motor power delivery module comprises:
a second input shaft disposed in parallel with the first input shaft and receiving power of the second motor/generator; and a first output shaft disposed in parallel with the second input shaft, receiving the power of the second input shaft and transmitting the power of the second input shaft to the final reduction gear of the differential apparatus.

13 . The power transmission system of claim 12 , wherein the second input shaft is provided with a second drive gear outputting power of the second input shaft and fixedly disposed on a front end portion thereof.

14 . The power transmission system of claim 13 , wherein a second driven gear meshed with the second drive gear is fixedly disposed on a first end portion of the second output shaft, and a second output gear meshed with the final reduction gear of the differential apparatus is fixedly disposed on a second end portion of the second output shaft.

15 . A power transmission system of a hybrid electric vehicle that uses an engine and first and second motor/generators as power sources, comprising:
an engine power delivery module including a first input shaft directly connected to the engine to receive power of the engine, an intermediate shaft connected to the first input shaft through a planetary gear set and directly connected to the first motor/generator to receive power of the first input shaft and to transmit the power of the first input shaft to the first motor/generator, and a first output shaft disposed in parallel with the first input shaft, receiving the power of the first input shaft and transmitting the power of the first input shaft to a final reduction gear of a differential apparatus, and configured to transmit the power of the engine to the first motor/generator as driving power for generating electricity and to selectively transmit the power of the engine as driving power for driving the vehicle; and a motor power delivery module including a second input shaft disposed in parallel with the first input shaft and receiving power of the second motor/generator, and a first output shaft disposed in parallel with the second input shaft, receiving power of the second input shaft and transmitting the power of the second input shaft to the final reduction gear of the differential apparatus, and configured to transmit the power of the second motor/generator as driving power for driving the vehicle.

16 . The power transmission system of claim 15 , wherein the intermediate shaft is a hollow shaft and is disposed at a radial exterior of and concentrically with the first input shaft, and the planetary gear set and the first motor/generator are disposed respectively at a radial exterior of both end portions of the intermediate shaft.

17 . The power transmission system of claim 16 , wherein the planetary gear set is disposed at a rear end portion of the intermediate shaft and the first motor/generator is disposed at a front end portion of the intermediate shaft.

18 . The power transmission system of claim 17 , wherein the planetary gear set is configured to increase a rotation speed of the first input shaft and to transmit the increased rotation speed to the first motor/generator.

19 . The power transmission system of claim 18 , wherein the planetary gear set is a single pinion planetary gear set including a sun gear directly connected to the first motor/generator, a planet carrier directly connected to the first input shaft, and a ring gear directly connected to a transmission housing.

20 . The power transmission system of claim 15 , wherein a clutch configured to selectively transmit power or not is disposed on the first input shaft or the first output shaft.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Ji Seongwook
• Kook Jae Chang
• Cho Wonmin
• Noh Myeong Hoon
• Seo Kangsoo
• Hwang Seong Wook

Classifications

• F16H37/0806

  with a plurality of driving or driven shafts · CPC title

• B60K6/365 Primary

  with the gears having orbital motion · CPC title

• Y10S903/91

  Orbital, e.g. planetary gears · CPC title

• B60K6/44

  Series-parallel type · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title