Transmission system of hybrid electric vehicle

Patent metadata

Field	Value
Publication number	US-2015114175-A1
Application number	US-201414253414-A
Country	US
Kind code	A1
Filing date	Apr 15, 2014
Priority date	Oct 28, 2013
Publication date	Apr 30, 2015
Grant date	—

Abstract

A transmission system of a hybrid electric vehicle may include a first shaft connected to an engine, a first hollow shaft disposed without rotational interference with the first shaft, selectively connected to the first shaft, and provided with a first output gear, a second hollow shaft disposed without rotational interference with the first hollow shaft and provided with a second output gear, a second shaft disposed in parallel with the first shaft and connected to the first shaft through a gear unit, a clutch selectively connecting the first shaft to the first hollow shaft, a first motor/generator operably connected to the second hollow shaft, and a second motor/generator operably connected to the second shaft.

First claim

What is claimed is:

1 . A transmission system of a hybrid electric vehicle comprising:
a first shaft connected to an engine; a first hollow shaft disposed without rotational interference with the first shaft, selectively connected to the first shaft, and provided with a first output gear; a second hollow shaft disposed without rotational interference with the first hollow shaft and provided with a second output gear; a second shaft disposed in parallel with the first shaft and connected to the first shaft through a gear unit; a clutch selectively connecting the first shaft to the first hollow shaft; a first motor/generator operably connected to the second hollow shaft; and a second motor/generator operably connected to the second shaft.

2 . The transmission system of claim 1 , further comprising a reduction gear unit transmitting torque of the first hollow shaft or the second hollow shaft to a differential apparatus.

3 . The transmission system of claim 2 , wherein the reduction gear unit comprises:
an intermediate shaft disposed between the first shaft and the differential apparatus and in parallel with the first shaft; a first intermediate gear provided on the intermediate shaft and engaged with the first output gear; a second intermediate gear provided on the intermediate shaft and engaged with the second output gear; and a drive gear provided on the intermediate shaft and engaged with a final reduction gear of the differential apparatus.

4 . The transmission system of claim 1 , wherein the gear unit comprises:
a first externally-meshing gear disposed on the first shaft; and a second externally-meshing gear provided on the second shaft and engaged with the first externally-meshing gear.

5 . The transmission system of claim 1 , wherein the clutch is disposed between the first shaft and the first hollow shaft.

6 . The transmission system of claim 1 , further comprising a damper disposed between the engine and the first shaft.

7 . A transmission system of a hybrid electric vehicle comprising:
a first shaft connected to an engine; a first hollow shaft disposed without rotational interference with the first shaft and selectively connected to the first shaft; a second hollow shaft disposed without rotational interference with the first hollow shaft; a second shaft disposed in parallel with the first shaft; first and second output gears disposed respectively on the first and second hollow shafts and respectively outputting torques of the first and second hollow shafts; a gear unit disposed between the first shaft and the second shaft and transmitting torque between the first shaft and the second shaft; a clutch selectively connecting the first shaft to the first hollow shaft; a first motor/generator operably connected to the second hollow shaft; and a second motor/generator operably connected to the second shaft.

8 . The transmission system of claim 7 , further comprising a reduction gear unit transmitting the torque of the first hollow shaft or the second hollow shaft to a differential apparatus.

9 . The transmission system of claim 8 , wherein the reduction gear unit comprises:
an intermediate shaft disposed between the first shaft and the differential apparatus and in parallel with the first shaft; a first intermediate gear provided on the intermediate shaft and engaged with the first output gear; a second intermediate gear provided on the intermediate shaft and engaged with the second output gear; and a drive gear provided on the intermediate shaft and engaged with a final reduction gear of the differential apparatus.

10 . The transmission system of claim 7 , wherein the gear unit comprises:
a first externally-meshing gear disposed on the first shaft; and a second externally-meshing gear provided on the second shaft and engaged with the first externally-meshing gear.

11 . The transmission system of claim 7 , wherein the clutch is disposed between the first shaft and the first hollow shaft.

12 . The transmission system of claim 7 , further comprising a damper disposed between the engine and the first shaft.

13 . A transmission system of a hybrid electric vehicle comprising:
a first shaft connected to an engine; a first hollow shaft disposed without rotational interference with the first shaft and selectively connected to the first shaft; a second hollow shaft disposed without rotational interference with the first hollow shaft; a second shaft disposed in parallel with the first shaft; first and second output gears disposed respectively on the first and second hollow shafts and respectively outputting torques of the first and second hollow shafts; a gear unit disposed between the first shaft and the second shaft and transmitting torque between the first shaft and the second shaft; a clutch disposed between the first shaft and the first hollow shaft; a first motor/generator operably connected to the second hollow shaft; a second motor/generator operably connected to the second shaft; and a reduction gear unit transmitting the torque of the first hollow shaft or the second hollow shaft to a differential apparatus.

14 . The transmission system of claim 13 , wherein the gear unit comprises:
a first externally-meshing gear disposed on the first shaft; and a second externally-meshing gear provided on the second shaft and engaged with the first externally-meshing gear.

15 . The transmission system of claim 13 , wherein the reduction gear unit comprises:
an intermediate shaft disposed between the first shaft and the differential apparatus and in parallel with the first shaft; a first intermediate gear provided on the intermediate shaft and engaged with the first output gear; a second intermediate gear provided on the intermediate shaft and engaged with the second output gear; and a drive gear provided on the intermediate shaft and engaged with a final reduction gear of the differential apparatus.

16 . The transmission system of claim 13 , further comprising a damper disposed between the engine and the first shaft.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Ahn Chulmin
• Kim Seok Joon
• Byun Seonggon
• Kim Tae Hyun
• Kim Baekyu
• Suh Buhm Joo
• Lee Jae Heon

Classifications

• Y10T74/19014

  Plural prime movers selectively coupled to common output · CPC title

• B60K6/36 Primary

  characterised by the transmission gearings · CPC title

• B60K6/42 Primary

  characterised by the architecture of the hybrid electric vehicle · CPC title

• B60K6/44

  Series-parallel type · CPC title

• F16H57/0006

  Vibration-damping or noise reducing means specially adapted for gearings (devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183) · CPC title