Transmission for vehicle

Patent metadata

Field	Value
Publication number	US-10047830-B2
Application number	US-201514936455-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Jul 1, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A transmission for a vehicle may include a first input shaft continuously receiving torque from a power source, a second input shaft selectively receiving torque from the power source through a clutch, a first countershaft and a second countershaft connected with the first input shaft and the second input shaft, respectively, by a transfer gear pair, coupling devices transmitting torque to the first countershaft and the second countershaft from the first input shaft and the second input shaft, respectively, by selecting the transfer gear pairs, a one-way clutch restricting torque provided to the first input shaft to be transmitted only to the first countershaft from the first input shaft, and a shifting mechanism configured to change and output power from the power source to the output shaft by selecting a shift gear pair corresponding to a speed of the vehicle, using a synchronizer.

First claim

What is claimed is:

1. A transmission for a vehicle, comprising:
a first input shaft continuously receiving torque from a power source;
a second input shaft selectively receiving torque from the power source through a clutch;
a first countershaft and a second countershaft connected with the first input shaft and the second input shaft, respectively, by transfer gear pairs;
coupling devices transmitting torque to the first countershaft and the second countershaft from the first input shaft and the second input shaft, respectively, by selecting the transfer gear pairs;
a one-way clutch restricting torque provided to the first input shaft to be transmitted only to the first countershaft from the first input shaft; and
a shifting mechanism including a plurality of shift gear pairs having different gear ratios on the first countershaft, the second countershaft, and an output shaft, and configured to change and output power from the power source to the output shaft by selecting a shift gear pair corresponding to a speed of the vehicle, using a synchronizer.

2. The transmission of claim 1 , wherein the one-way clutch is disposed between an input transfer gear of the transfer gear pair on the first input shaft and the first input shaft.

3. The transmission of claim 1 , wherein the transfer gear pairs include:
a first transfer gear pair comprising a first input transfer gear on the first input shaft and a first output transfer gear on the first countershaft; and
a second transfer gear pair comprising a second input transfer gear on the second input shaft and a second output transfer gear on the second countershaft, and
wherein the coupling devices include:
a first transfer coupling device selectively coupling the first transfer gear pair; and
a second transfer coupling device selectively coupling the second transfer gear pair.

4. The transmission of claim 3 , wherein the first transfer coupling device is disposed on the first countershaft and engaged with the first output transfer gear, and
the second transfer coupling device is disposed on the second countershaft and engaged with the second output transfer gear.

5. The transmission of claim 4 , wherein the first transfer coupling device is disposed at a first side or a second side of the first output transfer gear, and
the second transfer coupling device is disposed at a first side or a second side of the second output transfer gear.

6. The transmission of claim 1 , wherein the shift gear pairs include:
a plurality of sub-shift gear pairs having different gear ratios and disposed on the first countershaft and the output shaft; and
a plurality of main-shift gear pairs having different gear ratios and disposed on the second countershaft and the output shaft,
wherein the sub-shift gear pairs and the main-shift gear pairs are configured such that shift gear pairs having same gear ratios exist.

7. The transmission of claim 3 , wherein the shift gear pairs include:
a plurality of sub-shift gear pairs having different gear ratios and disposed on the first countershaft and the output shaft; and
a plurality of main-shift gear pairs having different gear ratios and disposed on the second countershaft and the output shaft, and
wherein the shift gear pairs are configured such that a same resultant gear ratio exists between resultant gear ratios of a gear ratio of the first transfer gear pair and gear ratios of the sub-shift gear pairs, and resultant gear ratios of a gear ratio of the second transfer gear pair and the main-shift gear pairs.

8. The transmission of claim 6 , wherein the shift gear pairs having the same gear ratios have gear ratios over a specific gear ratio.

9. The transmission of claim 6 , wherein the sub-shift gear pairs and the main-shift gear pairs share output gears on the output shaft.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Eo Soon Ki
• Choi Yong Seok
• Lim Chae Hong

Classifications

• 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

• F16H3/097

  the input and output shafts being aligned on the same axis · CPC title

• F16H3/10

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

• F16H3/006 Primary

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• F16H61/04 Primary

  Smoothing ratio shift · CPC title