Transmission for vehicle

Patent metadata

Field	Value
Publication number	US-10107361-B2
Application number	US-201514819011-A
Country	US
Kind code	B2
Filing date	Aug 5, 2015
Priority date	Jan 30, 2015
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A transmission for a vehicle may include a first input shaft continuously receiving power from an engine, a second input shaft selectively receiving power from the engine, a first output shaft and a second output shaft disposed in parallel with the first input shaft and the second input shaft, an initial shift device including a plurality of driving gears on the second input shaft, a plurality of driven gears on the first output shaft and the second output shaft for making a series of gear shift ranges, and a plurality of synchronizers selectively making a predetermined gear shift range of the gear shift ranges made by the driving gears and the driven gears, a duplicate shift device configured to make duplicate gear shift ranges, a first output gear disposed on the first output shaft to draw power from the first output shaft, and a one-way clutch.

First claim

What is claimed is:

1. A transmission for a vehicle comprising:
a first input shaft continuously receiving power from an engine;
a second input shaft selectively receiving power from the engine;
a first output shaft and a second output shaft disposed in parallel with the first input shaft and the second input shaft;
an initial shift device including a plurality of driving gears on the second input shaft, a plurality of driven gears on the first output shaft and the second output shaft for making a series of gear shift changes by engaging with the driving gears on the second input shaft, respectively, and a plurality of synchronizers selectively making a predetermined gear shift change of the gear shift changes made by the driving gears and the driven gears;
a duplicate shift device configured to make duplicate gear shift changes which have a gear ratio the same as a gear ratio of one or more gear shift changes of the series of gear shift changes made by the initial shift device, between the first input shaft and the first output shaft;
a first output gear disposed on the first output shaft to draw power from the first output shaft; and
a one-way clutch disposed in a power transmission line from the engine to the first output gear through the duplicate shift device to transmit power from the engine only to the first output gear, wherein the one-way clutch transmits power from the engine towards the first output gear,
wherein the duplicate shift device achieves the duplicate gear shift changes sequentially from a gear shift change having a largest gear ratio of the series of gear shift changes made among the second input shaft, the first output shaft, and the second output shaft,
wherein when the series of gear shift changes that are made by the initial shift device includes at least four or more gear shift changes sequentially from a first gear shift change having the largest gear ratio, the duplicate shift device is configured to make a first duplicate gear shift change having a gear ratio the same as a gear ratio of the first gear shift change and a second duplicate gear shift change having a gear ratio the same as a gear ratio of a second gear shift change, and
wherein the duplicate shift device includes:
a first duplicate driving gear disposed on the first input shaft and a first duplicate driven gear disposed on the first output shaft in order to make the first duplicate gear shift change;
a second duplicate driving gear disposed on the first input shaft and a second duplicate driven gear disposed on the first output shaft in order to make the second duplicate gear shift change; and
a 1&2 duplicate synchronizer for selecting the first duplicate gear shift change or the second duplicate gear shift change from a neutral state in which the power of the engine is not transmitted to the first output shaft through the 1&2 duplicate synchronizer.

2. The transmission of claim 1 , wherein the second input shaft is a hollow shaft fitted on the first input shaft and connected to a clutch to selectively receive power from the engine.

3. The transmission of claim 1 , wherein the first gear shift change and a fourth gear shift change are made between the second input shaft and the first output shaft by the initial shift device, and
the second gear shift change and a third gear shift change are made between the second input shaft and the second output shaft by the initial shift device.

4. The transmission of claim 3 , wherein one or more gear shift changes having a gear ratio smaller than a gear ratio of the fourth gear shift change are made between the second input shaft and the second output shaft.

5. The transmission of claim 1 , wherein a receive gear for receiving power from the first output shaft is disposed on the second output shaft,
a medium gear is disposed between the first output gear and the receive gear to transmit power from the first output gear to the receive gear, and
a second output gear transferring power from the second output shaft to a differential is integrally disposed on the second output shaft.

6. The transmission of claim 5 , wherein the one-way clutch is disposed between the first output shaft and the first output gear so that power is transmitted only to the first output gear from the first output shaft.

7. The transmission of claim 5 , wherein in the first duplicate driven gear and the second duplicate driven gear, a shift gear and a clutch gear are separated, and the one-way clutch is disposed between the shift gear and the clutch gear to transmit power only to the clutch gear from the shift gear.

8. The transmission of claim 5 , wherein a hub of the 1&2 duplicate synchronizer comprises an inner hub fitted on the first output shaft and an outer hub disposed outside the inner hub to rotate relative to the inner hub and supporting a sleeve, and
the one-way clutch is disposed between the outer hub and the inner hub to transmit power only to the inner hub from the outer hub.

9. The transmission of claim 5 , wherein the one-way clutch is disposed between a flywheel of the engine and the first input shaft to transmit power only to the first input shaft from the flywheel of the engine.

10. The transmission of claim 5 , wherein the one-way clutch is disposed between a flywheel of the engine and the first input shaft to transmit power only to the first input shaft from the flywheel of the engine.

11. The transmission of claim 1 , wherein a second output gear for drawing power from the second output shaft is disposed on the second output shaft, and
the first output gear of the first output shaft and the second output gear of the second output shaft are engaged with a ring gear of a differential to transfer power to the differential.

12. The transmission of claim 11 , wherein in the first duplicate driven gear and the second duplicate driven gear, a shift gear and a clutch gear are separated, and the one-way clutch is disposed between the shift gear and the clutch gear to transmit power only to the clutch gear from the shift gear.

13. The transmission of claim 11 , wherein a hub of the 1&2 duplicate synchronizer comprises an inner hub fitted on the first output shaft and an outer hub disposed outside the inner hub to rotate relatively to the inner hub and supporting a sleeve, and
the one-way clutch is disposed between the outer hub and the inner hub to transmit power only to the inner hub from the outer hub.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Park Ki Jong
• Eo Soon Ki
• Kim Chon Ok

Classifications

• F16H2003/0826

  wherein at least one gear on the input shaft, or on a countershaft is used for two different forward gear ratios · CPC title

• F16H2003/007

  with two flow paths, one being directly connected to the input, the other being connected to the input through a clutch · CPC title

• F16H3/093

  with two or more countershafts · CPC title

• F16H3/10 Primary

  with one or more one-way clutches as an essential feature · CPC title

• F16H2200/0052

  the gear ratios comprising six forward speeds · CPC title