Power transmission system of hybrid electric vehicle

Patent metadata

Field	Value
Publication number	US-10059190-B2
Application number	US-201715400543-A
Country	US
Kind code	B2
Filing date	Jan 6, 2017
Priority date	Jul 27, 2016
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A power transmission system of a hybrid electric vehicle uses an engine and a motor/generator as power sources, and includes: a torque converter including a planetary gear set having first, second, and third rotating elements, the first rotating element being selectively connected to a transmission housing, the second rotating element being connected to an engine output shaft of the engine, and the third rotating element being connected to a motor output shaft of the motor/generator; an input device including a first input shaft selectively connected to the motor output shaft through one clutch and a second input shaft that is disposed on a same shaft line as the first input shaft to be selectively connected to the motor output shaft through another clutch; and a shift output device shifting and outputting rotation power of the input device.

First claim

What is claimed is:

1. A power transmission system of a hybrid electric vehicle using an engine and a motor/generator as power sources, the power transmission system comprising:
a torque converter configured to have a planetary gear set having first, second, and third rotating elements, the first rotating element being selectively connected to a transmission housing, the second rotating element being connected to an engine output shaft of the engine, and the third rotating element being connected to a motor output shaft of the motor/generator;
an input device configured to have a first input shaft that is selectively connected to the motor output shaft through one clutch and has at least one input gear fixedly disposed thereon and a second input shaft that is disposed on a same shaft line as the first input shaft to be selectively connected to the motor output shaft through another clutch and has at least one input gear fixedly disposed thereon; and
a shift output device shifting and outputting rotation power of the input device,
wherein the shift output device includes first and second output shafts disposed in parallel with the first and second input shafts and is configured to have a plurality of change gears that are disposed on the first and second output shafts in a state in which the shift output device is engaged with input gears on the first and second input shafts to be selectively synchronous-connected to the first output shaft or the second output shaft by each synchronous unit.

2. The power transmission system of claim 1 , wherein in the input device, the second input shaft is a hollow shaft and the first input shaft is disposed on the same shaft line by penetrating through a hollow portion of the second input shaft.

3. The power transmission system of claim 1 , wherein the torque converter is disposed in a space of an inner diameter part of a rotor of the motor/generator.

4. The power transmission system or claim 3 , wherein the torque converter is configured to have a single pinion planetary gear set having the first rotating element that is a sun gear, the second rotating element that is a planetary carrier, and the third rotating element that is a ring gear.

5. The power transmission system or claim 1 , wherein the torque converter is configured to have a single pinion planetary gear set having the first rotating element that is a sun gear, the second rotating element that is a planetary carrier, and the third rotating element that is a ring gear.

6. The power transmission system of claim 1 , wherein:
as the at least one input gear fixedly disposed on the second input shaft, a first input gear operated as second-shift and reverse-shift input gears and a second input gear operated as fourth-shift and sixth-shift input gears are sequentially disposed from front to back, and
as the at least one input gear fixedly disposed on the first input shaft, a third input gear operated as a fifth-shift input gear, a fourth input gear operated as a first-shift input gear, and a fifth input gear operated as a third-shift input gear are sequentially disposed from front to back.

7. The power transmission system of claim 6 , wherein the shift output device includes:
a first shift output mechanism that selectively synchronous-connects four change gears to a first output shaft by a selective operation of first and second synchronizers disposed on the first output shaft disposed in parallel with the first and second input shafts to output the rotation power at four shift ratios;
a second shift output mechanism that selectively synchronous-connects three change gears to a second output shaft by a selective operation of third and fourth synchronizers disposed on the second output shaft disposed in parallel with the first and second input shafts to output the rotation power at three shift ratios; and
a reverse output mechanism that is configured to have a reverse shaft disposed in parallel with the second input shaft and reverse input gears disposed on the reverse shaft to be engaged between one of the input gears on the second input shaft and one of the change gears on the second output shaft.

8. The power transmission system of claim 7 , wherein the first synchronizer selectively synchronous-connects a second-shift change gear engaged with the first input gear and a fourth-shift change gear engaged with the second input gear to the first output shaft.

9. The power transmission system of claim 7 , wherein the second synchronizer selectively synchronous-connects a first-shift change gear engaged with the fourth input gear and a third-shift change gear engaged with the fifth input gear to the first output shaft.

10. The power transmission system of claim 7 , wherein the third synchronizer selectively synchronous-connects a reverse change gear engaged with the reverse input gears to be power-connected to the first input gear and a sixth-shift change gear engaged with the second input gear to the second output shaft.

11. The power transmission system of claim 7 , wherein the fourth synchronizer selectively synchronous-connects a fifth-shift change gear engaged with the third input gear to the second output shaft.

12. The power transmission system of claim 7 , wherein the reverse input gears are configured to have a large-diameter first reverse input gear disposed on the reverse shaft to be engaged with the first input gear and a small-diameter second reverse input gear engaged with a reverse change gear.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Huh Jun Hoi
• Choi Kwangmin
• Park Tae Sic
• Lee Jae Heon
• Park Seongeun
• Suh Buhm Joo

Classifications

• B60K6/36 Primary

  characterised by the transmission gearings · CPC title

• B60K6/26

  characterised by the motors or the generators · CPC title

• F16H2306/48

  Synchronising of new gear · CPC title

• B60Y2400/73

  Planetary gearings · CPC title

• Y10S903/914

  Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means · CPC title