KR101836617B1 - Multi-stage dct for vehicle - Google Patents

Abstract

The multi-stage DCT for a vehicle according to the present invention includes a first input shaft installed to receive power transmitted through a first clutch; A second input shaft disposed concentrically with the first input shaft and configured to receive power transmitted through the second clutch; A plurality of odd-numbered single-drive gears provided on the first input shaft to implement odd-numbered gear stages; A plurality of even-numbered single-drive gears provided on a second input shaft to implement even-numbered gear stages; A first counter shaft disposed parallel to the first input shaft and the second input shaft; A plurality of Hall-effect driven gears and even-numbered driven gears disposed on the first counter shaft to mesh with the odd-numbered single-drive gears and the even-numbered single-drive gears; A plurality of synchronizers for selectively connecting the first and second counter driven gears to the first counter shaft; Speed low-speed drive gear provided on the first counter shaft in order to realize low-gear stages having a relatively large gear ratio among a plurality of low-speed gear stages as the gear ratio is increased. Speed single-speed gear provided on the first counter shaft to realize high-speed gear stages with relatively small gear ratios among a plurality of gear stages; An output shaft disposed parallel to the first counter shaft; A low speed single driven gear and a high speed single driven gear disposed on the output shaft so as to mesh with the low speed single speed gear and the high speed single speed gear, respectively; And a first synchronizer for selectively connecting one of the low speed step driven gear or the high speed stepped driven gear to the output shaft.

Description

Multi-stage DCT for vehicle {MULTI-STAGE DCT FOR VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dual clutch transmission for a vehicle, and more particularly, to a structure of a transmission capable of shortening the overall length of the transmission as much as possible and implementing a plurality of gear positions.

A dual clutch transmission (DCT) basically comprises two input shafts of a conventional synchronous engagement type manual transmission, receives power from two clutches from an engine, and sequentially forms transmission shafts adjacent to each other on two input shafts .

Thus, the dual-clutch transmission is provided with gear shift gears constituting respective gear stages that are normally engaged between the input shafts and the output shafts disposed in parallel thereto, and selectively connecting or blocking these gear shift gears to the input shaft or the output shaft A synchronizing device is disposed so that the total length of the transmission and the number of gear positions that can be implemented are determined according to the number of gears and synchronizing devices installed.

In order to maximize the fuel efficiency by maximizing the efficiency of operation of the engine in the vehicle, it is necessary to increase the number of speed change stages that can be implemented by the transmission as much as possible. To increase the number of the speed change stages as described above, Increasing the length can reduce vehicle mountability and increase weight, which can negatively affect fuel economy.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-1509982 B1

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a problem, and it is an object of the present invention to provide a transmission structure in which the entire length of the transmission is made as short as possible to reduce the weight of the transmission, A multi-stage DCT for a vehicle.

According to an aspect of the present invention, there is provided a multi-stage DCT for a vehicle comprising: a first input shaft installed to receive power transmitted through a first clutch; A second input shaft disposed concentrically with the first input shaft and configured to receive power transmitted through the second clutch; A plurality of odd-numbered single-drive gears provided on the first input shaft to implement odd-numbered gear stages; A plurality of even-numbered single-drive gears provided on the second input shaft to implement even-numbered gear stages; A first counter shaft disposed parallel to the first input shaft and the second input shaft; A plurality of Hall-effect driven gears and even-numbered driven gears disposed on the first counter shaft to mesh with the odd-numbered single-drive gears and the even-numbered single-drive gears; A plurality of synchronizers for selectively connecting said first and second counter driven gears to said first counter shaft; Speed low-speed drive gear provided on the first counter shaft in order to realize low-gear stages having a relatively large gear ratio among a plurality of gear stages formed with a low gear stage as the gear ratio is increased. Speed single-speed gear provided on the first counter shaft to realize high-speed gear stages with relatively small gear ratios among the plurality of gear stages; An output shaft disposed parallel to the first counter shaft; A low speed single driven gear and a high speed single driven gear disposed on the output shaft so as to mesh with the low speed single speed gear and the high speed single speed gear, respectively; And a first synchronizer selectively connecting one of the low speed driven gear and the high speed single driven gear to the output shaft.

And a second synchronizer provided between one end of the first input shaft and the other end of the output shaft to connect the first input shaft and the output shaft to each other to realize five stages.

The plurality of odd-numbered single-drive gears provided on the first input shaft include a first-stage drive gear for implementing one stage, a 3 & 7th-stage single-drive gear for implementing third and seventh stages, and a 9th- And the plurality of even-numbered single-speed gears provided on the second input shaft are constituted by the 2 & 6th speed single-speed gear for implementing the 2nd and 6th gears and the 4 & 8th single-speed gear for implementing the 4th and 8th gears have.

The plurality of Hall-effect driven gears and the even-numbered driven gears disposed on the first counter shaft include a first stage driven gear for implementing one stage, a 3 & 7th stage driven gear for implementing third and seventh stages, Stage driven gear for implementing the second and sixth stages, a fourth and eighth stage driven gear for implementing the fourth and eighth stages, and a reverse driven gear for implementing the reverse gear stage, .

An idler shaft disposed parallel to the second input shaft; A first idler gear rotatably installed on the idler shaft and engaged with the 4 & cir & And a second idler gear connected to the first idler gear by a concentric axis and meshed with the reverse driven gear.

The plurality of synchronizers includes a third synchronizer selectively coupling one of the one-stage driven gear and the nine-stage driven gear to the first counter shaft, and a third synchronizer selectively connecting one of the reverse driven gear and the third and seventh driven gears to the first counter And a fifth synchronizer for selectively connecting one of the 2 & 6-stage driven gear and the 4 & 8-stage driven gear to the first counter shaft.

Wherein the low speed single drive gear provided on the first counter shaft and the low speed driven gear disposed on the output shaft implement the first, second, third, fourth, and reverse shift stages, The single-speed gear and the high-speed single-stage driven gear disposed on the output shaft may be configured to implement six stages, seven stages, eight stages and nine stages.

And the second synchronizer is installed on the output shaft.

A fourth-speed drive gear provided on the first input shaft to implement four stages; A second counter axis disposed concentrically with the first counter axis; A four-stage counter gear provided on the second counter shaft, the four-stage counter gear being composed of a first counter gear meshed with the four-stage speed drive gear and a second counter gear coupled with the first counter gear and rotating together; And a four-stage driven gear disposed on the output shaft and engaged with the second counter gear, and selectively connected to the output shaft by the second synchronizer.

According to the multi-stage DCT for a vehicle having the above-described structure, since the overall length of the transmission is shorter than the conventional one, the weight of the transmission can be reduced to improve the mountability to the vehicle and the multi- The fuel economy can be improved by driving.

1 shows a multi-stage DCT for a vehicle according to an embodiment of the present invention,
Fig. 2 is a chart showing operational modes for implementing the 9th-speed forward speed range and the 1-speed reverse speed range in the transmission of Fig. 1;
3 is a view showing a multi-stage DCT for a vehicle according to another embodiment of the present invention.

Hereinafter, a vehicle multi-stage DCT according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a view showing a multi-stage DCT for a vehicle according to an embodiment of the present invention. Referring to FIG. 1, a multi-stage DCT for a vehicle includes a first input shaft IS1 installed to receive power through a first clutch C1; A second input shaft IS2 disposed concentrically with the first input shaft IS1 and configured to receive power transmitted through the second clutch C2; A plurality of odd-numbered single-drive gears provided on the first input shaft IS1 to implement odd-numbered gear stages; A plurality of even-numbered single-drive gears provided on the second input shaft IS2 to implement even-numbered gear stages; A first counter axis CS1 disposed in parallel with the first input shaft IS1 and the second input shaft IS2; A plurality of Hall-effect driven gears and even-numbered driven gears disposed on the first counter axis CS1 to mesh with the odd-numbered single-drive gears and the even-numbered single-drive gears; A plurality of synchronizers for selectively connecting the first and second counter driven gears to the first counter shaft CS1; Speed low-speed drive gear (LD) provided on the first counter shaft (CS1) for realizing low-stage shift stages having a relatively high gear ratio among a plurality of gear stages formed with low gear stages as the gear ratio is increased. Speed high speed drive gear (HD) provided on the first counter shaft (CS1) to realize the high gear stages having relatively small gear ratios among the plurality of gear stages; An output shaft OS disposed in parallel with the first counter axis CS1; A low speed stage driven gear (LP) and a high speed stage driven gear (HP) arranged on the output shaft (OS) so as to engage with the low speed short drive gear (LD) and the high speed single drive gear (HD); And a first synchronizer SN1 for selectively coupling one of the low speed driven gear LP and the high speed single driven gear HP to the output shaft OS.

Particularly, the present invention provides a second synchro (synchro) for connecting the first input shaft IS1 and the output shaft OS to each other in order to realize five stages provided between one end of the first input shaft IS1 and the other end of the output shaft OS And a sniper SN2.

That is, when the first synchronizer SN1 between the low-speed stage driven gear LP and the high-speed stage driven gear HP disposed on the output shaft OS is switched, the second synchronizer SN2 changes the speed- The first input shaft IS1 and the output shaft OS are directly connected to each other. A more specific operation mode will be described later.

The plurality of odd-numbered single-drive gears provided on the first input shaft IS1 include a first-stage drive gear 1D for implementing one stage, a third and seventh single-drive gear 3 & 7D for implementing third and seventh stages, And a ninth-stage short-drive gear 9D for implementing the step.

The plurality of even-numbered single-speed driven gears provided on the second input shaft IS2 are provided with 2 & tilde & 6 single-drive gears 2 & 6D for implementing the second and sixth stages, 4 & ). ≪ / RTI >

The plurality of Hall-effect driven gears and the even-numbered driven gears disposed on the first counter axis CS1 include a first stage driven gear 1P for implementing one stage and a third stage # 7 for implementing the third stage and the seventh stage The driven gears 3 and 7P and the 9th stage driven gear 9P for implementing the 9th stage and the 2 & 6th stage driven gears 2 and 6P for implementing the 2nd and 6th stages and the 4th and 8th gears for implementing the 4th and 8th stages, The driven gears 4 & 8P, and the reverse driven gear RP for implementing the reverse gear stage.

That is, a plurality of odd-numbered single-speed gears provided on the first input shaft IS1 and the second input shaft IS2 and even-numbered single-speed-driven gears may implement one or two shift stages, And is selectively realized by selectively transmitting power between a low speed single speed gear (LD) and an high speed single speed (HD) gear having different gear ratios.

Also, the present technology may be applied to an idler shaft (IDS) disposed parallel to the second input shaft IS2 to implement a post-diagnosis with the reverse driven gear RP; A first idler gear RID1 rotatably mounted on the idler shaft IDS and meshed with the 4 & 8th speed single-drive gear 4 & And a second idler gear RID2 connected to the first idler gear RID1 on a concentric axis and engaged with the reverse driven gear RP.

The plurality of synchronizers include a third synchronizer SN3 for selectively connecting one of the first stage driven gear 1P and the 9th stage driven gear 9P to the first counter shaft CS1, A fourth synchronizer SN4 for selectively connecting one of the gear RP and the third and seventh stage driven gears 3 and 7P to the first counter shaft CS1 and the fourth synchronizer SN4 for selectively connecting one of the 2 & And a fifth synchronizer SN5 for selectively connecting one of the first counter shaft CS1 and the second counter shaft CS1 to the first counter shaft CS1.

Therefore, by controlling the first, second, third, fourth and fifth synchronizers SN1, SN2, SN3, SN4 and SN5, it is possible to realize a multi-stage shift stage while keeping the overall length of the transmission short.

In order to selectively connect or disconnect the driven gears of the respective gear positions to the output shaft OS as in the conventional synchromesh type speed change mechanism, first gears S1, 2 & 6 Stage synchro (S5 "), a 9-stage synchro (S9), and a post-diagnosis synchro (SR).

The low speed short drive gear LD provided on the first counter shaft CS1 and the low speed driven gear LP disposed on the output shaft OS are disposed in the first, second, third, And the high speed single drive gear (HD) provided on the first counter axis (CS1) and the high speed stage driven gear (HP) disposed on the output shaft (OS) have 6th, 7th, 8th and 9th And the like.

As described above, in the configuration of the embodiment of the present invention, one or two gear stages can be implemented without providing all of the gear stages having the same number of gear stages as the gear stages for implementing the multi-stage gear stage, By forming a plurality of speed change stages while reducing the length, it is possible to contribute to the improvement of the fuel efficiency of the vehicle by the improvement of the energy efficiency of the vehicle.

Fig. 2 is a chart showing operational modes for implementing the 9th-speed forward speed range and the 1-speed reverse speed range in the transmission of Fig. 1; The multi-step DCT for a vehicle configured as described above can be operated so as to implement each gear stage according to the operation mode table as shown in FIG.

For example, in the DCT according to the present invention, the third stage can be implemented by connecting the first clutch, connecting the third synchronizer with the fourth synchronizer, and connecting the low speed synchronizer with the first synchronizer. At this time, the power of the engine is transmitted through the first clutch, the first input shaft, the 3 & 7 drive gear, the 3 & 7 driven gear, the fourth synchronizer, the first counter shaft, the low speed short drive gear, the low speed driven gear, And is extracted as a differential.

The seventh stage can be implemented by connecting the first clutch, connecting the third synchronizer with the fourth synchronizer, and connecting the high-speed synchronizer with the first synchronizer. At this time, the power of the engine is transmitted through the first clutch, the first input shaft, the 3 & 7 drive gear, the 3 & 7 driven gear, the fourth synchronizer, the first counter shaft, the high speed single drive gear, the high speed step driven gear, And is extracted as a differential.

The fifth stage can be implemented by engaging the first clutch and connecting the second synchronizer. At this time, the power of the engine is transmitted to the output shaft directly from the first input shaft and is drawn out as a differential.

On the other hand, the reverse shift stage can be implemented by fastening the rear diagnosis synchro in a state in which the second clutch is engaged. At this time, the power of the engine is transmitted from the second input shaft to the first counter gear, the first counter gear, the first idler gear, the idler shaft, the second idler gear, the reverse driven gear, the fourth synchronizer, , The first synchronizer, and the output shaft, and is drawn out in a differential manner.

3 is a view showing a multi-stage DCT for a vehicle according to another embodiment of the present invention. Referring to FIG. 3, in the multi-stage DCT for a vehicle according to another embodiment, the second synchronizer SN2 is installed on the output shaft OS.

A fourth-speed drive gear 4D provided on the first input shaft IS1 to implement four stages; A second counter axis CS2 disposed concentrically with the first counter axis CS1; A first counter gear 4C1 provided on the second counter shaft CS2 and meshed with the fourth-stage drive gear 4D and a second counter gear 4C2 connected to the first counter gear 4C1 and rotating together A four-stage counter gear 4C composed of a four-stage counter gear 4C; And a four-stage driven gear (4P) disposed on the output shaft (OS) and engaged with the second counter gear (4C2) and selectively connected to the output shaft (OS) by the second synchronizer (SN2) .

In this embodiment, a five-speed synchro S5 and a four-speed synchro S4 are provided beside the four-speed drive gear 4D and the four-speed driven gear 4P. According to this configuration, the shift delay phenomenon can be reduced when the vehicle is downshifted.

For example, in the case where the vehicle is downshifted from the 9th stage to the 4th stage, in the previous embodiment, three shifts from the 9th stage to the 6th stage, the 5th stage, and the 4th stage were performed in order to prevent the occurrence of the sense of disconnection during the shifting.

However, in the present embodiment, it is possible to carry out four-speed shifting directly without performing the five-speed shifting after performing the six-speed downshift at the ninth stage. That is, by engaging the first clutch C1 in a state in which the second synchronizer SN2 is controlled to connect the output shaft OS and the four-stage driven gear 4P, the downshift can be reduced and the shift delay can be reduced have.

At this time, when the fourth-stage implementation through the first clutch C1 is completed and the second clutch C2 is disengaged, the fifth synchronizer SN5 is immediately disposed at the 4 & 8 synchro (S4 & 8) side and the first synchronizer SN1 After the preliminary summing is completed, the first clutch Cl is released and the second clutch C2 is engaged, so that the second output shaft IS2 is connected to the second output shaft IS2 without breaking the power, Speed transmission can be achieved.

According to the multi-stage DCT for a vehicle having the above-described structure, since the overall length of the transmission is shorter than the conventional one, the weight of the transmission can be reduced to improve the mountability to the vehicle and the multi- The fuel economy can be improved by driving.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

C1: first clutch
C2: second clutch
IS1: first input shaft
IS2: second input shaft
CS1: 1st counter axis
CS2: Second counter axis
OS: Output shaft
IDS: Idler Axis
S1: First synchronizer

Claims (9)

A first input shaft installed to receive power through the first clutch;
A second input shaft disposed concentrically with the first input shaft and configured to receive power transmitted through the second clutch;
A plurality of odd-numbered single-drive gears provided on the first input shaft to implement odd-numbered gear stages;
A plurality of even-numbered single-drive gears provided on the second input shaft to implement even-numbered gear stages;
A first counter shaft disposed parallel to the first input shaft and the second input shaft;
A plurality of Hall-effect driven gears and even-numbered driven gears disposed on the first counter shaft to mesh with the odd-numbered single-drive gears and the even-numbered single-drive gears;
A plurality of synchronizers for selectively connecting said first and second counter driven gears to said first counter shaft;
Speed low-speed drive gear provided on the first counter shaft in order to realize low-gear stages having a relatively large gear ratio among a plurality of gear stages formed with a low gear stage as the gear ratio is increased.
Speed single-speed gear provided on the first counter shaft to realize high-speed gear stages with relatively small gear ratios among the plurality of gear stages;
An output shaft disposed parallel to the first counter shaft;
A low speed single driven gear and a high speed single driven gear disposed on the output shaft so as to mesh with the low speed single speed gear and the high speed single speed gear, respectively;
A first synchronizer selectively connecting one of the low speed driven gear and the high speed single driven gear to the output shaft; And
And a second synchronizer provided between one end of the first input shaft and the other end of the output shaft to implement a specific speed change stage by directly connecting the first input shaft and the output shaft so as to be coaxially rotated with each other. The method according to claim 1,
Wherein when the first synchronizer and the second synchronizer directly connect the first input shaft and the output shaft to each other, five stages are realized. The method of claim 2,
The plurality of odd-numbered single-drive gears provided on the first input shaft include a first-stage drive gear for implementing one stage, a 3 & 7th-stage single-drive gear for implementing third and seventh stages, and a 9th- Respectively,
Wherein the plurality of even-numbered single-speed gears provided on the second input shaft are constituted by 2 & cir & single-speed gears for implementing the second and sixth stages, and 4 & The method of claim 3,
The plurality of Hall-effect driven gears and the even-numbered driven gears disposed on the first counter shaft include a first stage driven gear for implementing one stage, a 3 & 7th stage driven gear for implementing third and seventh stages, Stage driven gear for implementing the second and sixth stages, a fourth and eighth stage driven gear for implementing the fourth and eighth stages, and a reverse driven gear for implementing the reverse gear stage, And a multi-stage DCT for a vehicle. The method of claim 4,
An idler shaft disposed parallel to the second input shaft;
A first idler gear rotatably installed on the idler shaft and engaged with the 4 & cir &
And a second idler gear connected to the first idler gear on a concentric axis and meshed with the reverse driven gear. The method of claim 4,
The plurality of synchronizers includes a third synchronizer selectively coupling one of the one-stage driven gear and the nine-stage driven gear to the first counter shaft, and a third synchronizer selectively connecting one of the reverse driven gear and the third and seventh driven gears to the first counter And a fifth synchronizer for selectively connecting one of the 2 & 6-stage driven gear and the 4 & 8-stage driven gear to the first counter shaft. The method of claim 4,
Speed low-speed driven gear disposed on the first counter shaft and the low-speed driven gear disposed on the output shaft implement the first, second, third, fourth, and reverse shift stages,
Wherein the high-speed single-speed gear provided on the first counter shaft and the high-speed single-stage driven gear disposed on the output shaft are configured to implement six stages, seven stages, eight stages and nine stages. The method of claim 2,
And the second synchronizer is mounted on the output shaft. The method of claim 8,
A fourth-speed drive gear provided on the first input shaft to implement four stages;
A second counter axis disposed concentrically with the first counter axis;
A four-stage counter gear provided on the second counter shaft, the four-stage counter gear being composed of a first counter gear meshed with the four-stage speed drive gear and a second counter gear coupled with the first counter gear and rotating together; And
Further comprising: a four-stage driven gear disposed on the output shaft and meshed with the second counter gear, and selectively connected to the output shaft by the second synchronizer.

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