KR102563434B1 - Planetary gear train of automatic transmission for vehicles - Google Patents

Abstract

A planetary gear train of an automatic transmission for a vehicle is disclosed. A planetary gear train of an automatic transmission for a vehicle according to an embodiment of the present invention includes an input shaft receiving power from an engine; an output shaft disposed parallel to the input shaft to output power; a first planetary gear set having first, second, and third rotating elements; a second planetary gear set having fourth, fifth, and sixth rotating elements; and a third planetary gear set including seventh, eighth, and ninth rotational elements, fixedly connected to the second rotational element and sixth rotational element, and fixedly connected to the input shaft; a second shaft fixedly connected to the eighth rotating element and externally geared to the output shaft; a third shaft fixedly connected to the first rotating element and selectively externally geared to the output shaft; a fourth shaft fixedly connected to the third rotating element; a fifth shaft fixedly connected to the fifth rotational element and the ninth rotational element; a sixth shaft fixedly connected to the seventh rotating element and selectively connected to the transmission housing; a seventh shaft fixedly connected to the fourth rotating element and selectively connected to the transmission housing; and two transfer gear units configured in a portion connected to an external gear between the shaft and the shaft.

Description

Planetary gear train of automatic transmission for vehicles {PLANETARY GEAR TRAIN OF AUTOMATIC TRANSMISSION FOR VEHICLES}

The present invention relates to an automatic transmission for a vehicle, and more particularly, to a planetary gear train for an automatic transmission for a vehicle capable of improving power transmission performance and fuel efficiency by realizing 12 forward speeds with a minimum configuration.

In general, in the field of automatic transmission, multi-stage shifting is being researched as a technology for improving fuel efficiency and maximizing drivability of vehicles, and the recent rise in oil prices is a factor that causes infinite competition to improve fuel efficiency. there is.

Accordingly, research is being conducted on reducing weight and improving fuel efficiency through down sizing for engines, and research is being conducted on automatic transmissions to secure drivability and fuel economy competitiveness at the same time through multi-stage shifting. .

However, as the number of shift stages increases in the automatic transmission, the number of internal parts, particularly the number of planetary gear sets, increases, and thus the total length of the transmission increases, and thus, mountability, production cost, weight, and power transmission efficiency may deteriorate.

Therefore, it is important to develop a planetary gear train that can bring out maximum efficiency with a small number of parts in order to increase the fuel efficiency improvement effect through multi-stage shifting of the automatic transmission.

In this respect, recent automatic transmissions are configured to realize shifts of 8 or more speeds and are installed in vehicles, and research and development of planetary gear trains capable of implementing more shift stages are continuously required.

However, most automatic transmissions with 8 or more speeds are composed of 3 to 4 planetary gear sets and 5 to 7 coupling elements (friction elements).

Accordingly, in order to multi-stage the gears of the automatic transmission, recently, a double-row structure in which a planetary gear set is placed on a planetary gear set is adopted, or a dog clutch is applied instead of a wet coupling element, but the structure applicable in this case is limited However, there is a problem in that the shift feeling is deteriorated due to the application of the dog clutch.

Matters described in this background art section are prepared to enhance understanding of the background of the invention, and may include matters that are not prior art already known to those skilled in the art to which this technique belongs.

An embodiment of the present invention implements 12 forward and 1 reverse speed stages by combining three planetary gear sets, two external gears, and six coupling elements, thereby improving power transmission performance and improving fuel efficiency according to multi-speed. It is intended to provide a planetary gear train of an automatic transmission for a vehicle that can be obtained.

In addition, an embodiment of the present invention is to provide a planetary gear train of an automatic transmission for a vehicle capable of improving mountability by reducing the electric field by minimizing the number of planetary gear sets while applying two external gears.

In addition, an embodiment of the present invention is intended to provide a planetary gear train of an automatic transmission for a vehicle capable of setting an optimal gear ratio by freely changing the number of gear teeth of a transfer gear unit and thereby improving power transmission performance and fuel efficiency.

In one or more embodiments of the present invention, the input shaft receiving the power of the engine; an output shaft disposed parallel to the input shaft to output power; a first planetary gear set having first, second, and third rotating elements; a second planetary gear set having fourth, fifth, and sixth rotating elements; and a third planetary gear set including seventh, eighth, and ninth rotational elements, fixedly connected to the second rotational element and sixth rotational element, and fixedly connected to the input shaft; a second shaft fixedly connected to the eighth rotating element and externally geared to the output shaft; a third shaft fixedly connected to the first rotating element and selectively externally geared to the output shaft; a fourth shaft fixedly connected to the third rotating element; a fifth shaft fixedly connected to the fifth rotational element and the ninth rotational element; a sixth shaft fixedly connected to the seventh rotating element and selectively connected to the transmission housing; a seventh shaft fixedly connected to the fourth rotating element and selectively connected to the transmission housing; And a planetary gear train of an automatic transmission for a vehicle including two transfer gear units configured in a portion connected to external gears between shafts can be provided.

In the planetary gear train, the fourth shaft may be selectively connected to the fifth shaft and the sixth shaft, and the third shaft may be selectively connected to the sixth shaft.

In addition, the planetary gear train includes four clutches selectively connecting the shaft and the shaft including the output shaft; and two brakes selectively connecting the sixth shaft and the seventh shaft to the transmission housing.

Here, the four clutches include a first clutch configured between the fourth shaft and the fifth shaft; a second clutch configured between the fourth shaft and the sixth shaft; a third clutch configured between the third shaft and the sixth shaft; and a fourth clutch configured between the third shaft and the output shaft, wherein the two brakes include a first brake configured between the sixth shaft and the transmission housing; and a second brake configured between the seventh shaft and the transmission housing.

In addition, the two transfer gear units include a first transfer gear unit configured between the second shaft and the output shaft; and a second transfer gear unit configured between the third shaft and the output shaft.

Also, the fourth clutch may be disposed between the output shaft and the second transfer gear unit.

In addition, the first planetary gear set is composed of a single pinion planetary gear set, the first, second, and third rotating elements are composed of a first sun gear, a first planet carrier, and a first ring gear, and the second planetary gear set The gear set is composed of a single pinion planetary gear set, wherein the fourth, fifth, and sixth rotating elements are composed of a second sun gear, a second planet carrier, and a second ring gear, and the third planetary gear set is a single pinion planetary gear set. It is composed of a gear set, and the seventh, eighth, and ninth rotating elements may be composed of a third sun gear, a third planet carrier, and a third ring gear.

In the planetary gear train according to an embodiment of the present invention, three planetary gear sets are arranged on the same axis as the input shaft, and rotational power output from the three planetary gear sets in two paths is transmitted to the output shaft through two external gears. By allowing it to be transmitted, the overall length can be reduced and mountability can be improved.

In addition, the planetary gear train according to the embodiment of the present invention applies two transfer gear units in addition to the planetary gear set, so that the optimal gear ratio for each vehicle can be set by freely changing the number of gear teeth, and the gear ratio can be changed to meet the required performance conditions. By improving the start performance, it is possible to delete the existing torque converter and apply the start clutch.

In addition, the planetary gear train according to the embodiment of the present invention implements 12 forward speeds and 1 reverse speed, thereby improving power transmission performance and improving fuel efficiency according to multi-speeding.

In addition, effects that can be obtained or predicted due to the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects expected according to an embodiment of the present invention will be disclosed within the detailed description to be described later.

1 is a configuration diagram of a planetary gear train according to an embodiment of the present invention.
2 is an operation table for each shift stage of coupling elements applied to a planetary gear train according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail through the accompanying drawings.

However, in order to clearly describe the embodiments of the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification for description.

In the following description, the names of the components are divided into first, second, etc. to distinguish them because the names of the components are the same, and are not necessarily limited to the order.

1 is a configuration diagram of a planetary gear train according to an embodiment of the present invention.

Referring to FIG. 1, the planetary gear train according to an embodiment of the present invention includes an input shaft (IS), an output shaft (OS), first, second, and third planetary gear sets (PG1) (PG2) (PG3), two It includes a transfer gear unit (TF1) (TF2), and coupling elements consisting of four clutches (C1) (C2) (C3) (C4) and two brakes (B1) (B2).

The input shaft IS is an input member, and rotational power from a crankshaft of an engine may be input through torque conversion through a torque converter.

The output shaft OS is an output member, and is arranged in parallel with the input shaft IS at a predetermined interval to transmit the shifted driving force to the driving shaft through a differential device (not shown).

The first, second, and third planetary gear sets PG1, PG2, and PG3 are formed on the same axis as the input shaft IS and the first, second, and third planetary gear sets PG1 ( They are arranged side by side in the order of PG2) (PG3).

The first planetary gear set PG1 is a single pinion planetary gear set, and includes a first sun gear S1 serving as a first rotating element N1 and a plurality of first pinions externally engaged with the first sun gear S1. The first sun gear (PC1), which is a second rotating element (N2) that supports the gear (P1) to rotate and revolve, is internally meshed with the plurality of first pinion gears (P1). and a first ring gear R1 as a third rotating element N3 connected to S1 by power.

The second planetary gear set PG2 is a single pinion planetary gear set, and includes a second sun gear S2 that is a fourth rotating element N4 and a plurality of second pinions externally meshed with the second sun gear S2. The second sun gear ( and a second ring gear R2 which is a sixth rotating element N6 connected to S2 by power.

The third planetary gear set PG3 is a single pinion planetary gear set, and includes a third sun gear S3 which is a seventh rotating element N7 and a plurality of third pinions externally engaged with the third sun gear S3. The third sun gear ( and a third ring gear R3 which is a ninth rotating element N9 connected to S3 by power.

Here, in the first, second, and third planetary gear sets PG1, PG2, and PG3, the second rotation element N2 is fixedly connected to the sixth rotation element N6, and the fifth rotation element N5 ) is fixedly connected to the ninth rotating element N9 and operates while holding seven shafts TM1 to TM7.

The detailed configuration of the seven axes (TM1 to TM7) is as follows.

The first shaft TM1 includes a second rotating element {N2; the first planetary carrier (PC1)} and the sixth rotating element {N6; It is fixedly connected to the second ring gear (R2)} and is fixedly connected to the input shaft (IS).

The second shaft TM2 includes an eighth rotating element {N8; It is fixedly connected to the third planetary carrier (PC3)} and externally geared to the output shaft (OS).

The third shaft TM3 includes a first rotating element {N1; It is fixedly connected to the first sun gear (S1)} and selectively connected to the output shaft (OS) by an external gear.

The fourth shaft TM4 includes a third rotating element {N3; It is fixedly connected to the first ring gear (R1)}.

The fifth shaft TM5 includes the fifth rotating element {N5; the second planetary carrier PC2} and the ninth rotating element {N9; It is fixedly connected to the third ring gear R3.

The sixth shaft TM6 includes a seventh rotating element {N7; It is fixedly connected to the third sun gear S3} and selectively connected to the transmission housing H.

The seventh shaft TM7 includes a fourth rotating element {N4; It is fixedly connected to the second sun gear S2} and selectively connected to the transmission housing H.

Here, the seven shafts TM1 to TM7 are connected to a plurality of rotation elements fixedly or selectively among the rotation elements of the planetary gear sets PG1, PG2, and PG3 together with the rotation elements connected to It may be a rotating member that transmits power while rotating, a rotating member that selectively connects the rotating element to the transmission housing (H), or a fixed member that directly connects and fixes the rotating element to the transmission housing (H). .

In addition, in the above description, fixedly connected or a term similar thereto means that a plurality of rotating elements connected through a corresponding shaft, including an input shaft and an output shaft, and a corresponding shaft are connected so as to rotate without a difference in rotational speed. That is, a plurality of fixedly connected rotating elements and corresponding shafts rotate in the same rotational direction and number of rotations.

In addition, in the above description, selectively connected or similar terms mean that a plurality of axes, including an input shaft and an output shaft, are connected to be rotatable in the same rotational direction and number of rotations through a coupling element, or the corresponding shaft is a coupling element It means that it is fixedly connected to the transmission housing through.

That is, when the coupling element selectively connects a plurality of shafts, when the coupling element operates, the plurality of shafts rotate in the same rotational direction and number of rotations, and when the coupling element is released, the coupling of the plurality of shafts is released.

In addition, when the coupling element selectively connects the corresponding shaft and the transmission housing, when the coupling element operates, the corresponding shaft is fixedly connected to the transmission housing and fixed, and when the coupling element is released, the corresponding shaft becomes rotatable.

In addition, two transfer gear units TF1 and TF2 are disposed at a portion where the shaft and the shaft are externally geared.

The first transfer gear unit TF1 includes a first transfer drive gear TF1a connected to the second shaft TM2 and a first transfer driven gear TF1b connected to the output shaft OS. The second shaft TM2 and the output shaft OS are externally geared.

The second transfer gear unit TF2 includes a second transfer drive gear TF2a connected to the third shaft TM3 and a second transfer driven gear TF2b connected to the output shaft OS. The third shaft (TM3) and the output shaft (OS) are externally geared.

Accordingly, the respective shafts connected by the first and second transfer gear units TF1 and TF2 rotate in opposite directions, and the gear ratios of the first and second transfer gear units TF1 and TF2 is set according to the transmission ratio required by the transmission.

Among the seven shafts TM1 to TM7, four clutches C1, C2, C3, and C4 are disposed at portions selectively connecting the output shaft and the shaft or the shaft and the shaft.

In addition, among the seven shafts TM1 to TM7, two brakes B1 and B2 are disposed at a portion where the shaft and the transmission housing H are selectively connected.

That is, looking at the arrangement positions of the four clutches (C1) (C2) (C3) C4) and the two brakes (B1) (B2), which are the seven coupling elements, are as follows.

The first clutch C1 is disposed between the fourth shaft TM4 and the fifth shaft TM5 to selectively connect the fourth shaft TM4 and the fifth shaft TM5 so that power is transmitted.

The second clutch C2 is disposed between the fourth shaft TM4 and the sixth shaft TM6 to selectively connect the fourth shaft TM4 and the sixth shaft TM6 so that power is transmitted.

The third clutch C3 is disposed between the third shaft TM3 and the fifth shaft TM5 to selectively connect the third shaft TM3 and the fifth shaft TM5 so that power is transmitted.

The fourth clutch C4 is disposed between the third shaft TM3 and the output shaft OS to selectively connect the third shaft TM3 and the output shaft OS so that power is transmitted.

The first brake B1 is disposed between the sixth shaft TM6 and the transmission housing H, and selectively connects and fixes the sixth shaft TM6 to the transmission housing H.

The second brake B2 is disposed between the seventh shaft TM7 and the transmission housing H, and selectively connects and fixes the seventh shaft TM7 to the transmission housing H.

In the fourth clutch C4 disposed between the third shaft TM3 and the output shaft OS, the third shaft TM3 and the output shaft OS are externally geared through the second transfer gear unit TF2. Since it is connected, it can be arranged between the third shaft TM3 and the second transfer gear unit TF2 or between the second transfer gear unit TF2 and the output shaft OS. In the embodiment of the present invention, in FIG. As in, it is disclosed that it is disposed between the second transfer gear unit TF2 and the output shaft OS.

In the above, each coupling element composed of the first, second, third, and fourth clutches (C1) (C2) (C3) (C4) and the first and second brakes (B1) (B2) is supplied from the hydraulic control device. It may consist of a multi-plate hydraulic friction coupling unit operated by hydraulic pressure, and a wet multi-plate hydraulic friction coupling unit is mainly used, but it is possible to use an electrical signal supplied from an electronic control device such as a dog clutch, an electromagnetic clutch, and a magnetic particle clutch. It can be made of a coupling unit that can be operated according to.

2 is an operation table for each shift stage of coupling elements acting on a planetary gear train according to an embodiment of the present invention.

Referring to FIG. 2 , the planetary gear train according to the embodiment of the present invention has first, second, third, and fourth clutches C1, C2, C3, and C4, which are coupling elements at each shift stage, and Three of the first and second brakes B1 and B2 are operated to shift gears up to 12 forward speeds and 1 reverse gear, and a shift process according to an example is as follows.

[Forward 1 speed]

In the forward first speed stage D1, the third and fourth clutches C3 and C4 and the second brake B2 are operated simultaneously.

Accordingly, the third shaft TM3 moves to the first shaft TM1 while being fixedly connected to the fifth shaft TM5 and the output shaft OS by the operation of the third and fourth clutches C3 and C4. The input is made, and while the seventh shaft TM7 operates as a fixed element by the operation of the second brake B2, it is shifted to a set gear ratio through the third shaft TM3, and output is made.

Then, the rotational power of the third shaft (TM3) is transmitted to the output shaft (OS) according to the gear ratio of the second transfer gear unit (TF2) so that the driving at the first forward speed is achieved.

[Forward 2nd speed]

In the second forward speed stage D2, the first, third, and fourth clutches C1, C3, and C4 are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the fifth shaft TM5 by the operation of the first clutch C1, and the third shaft TM3 is connected to the third and fourth clutches C3 and C4. In the state of being fixedly connected to the fifth shaft TM5 and the output shaft OS by operation, input is made to the first shaft TM1 and shifted to a set gear ratio through the third shaft TM3 to output.

Then, the rotational power of the third shaft (TM3) is transmitted to the output shaft (OS) according to the gear ratio of the second transfer gear unit (TF2) so that forward 2-speed travel is achieved.

[Forward 3rd speed]

In the forward third gear stage D3, the first and fourth clutches C1 and C4 and the second brake are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the fifth shaft TM5 by the operation of the first clutch C1, and the third shaft TM3 is connected to the output shaft OS by the operation of the fourth clutch C4. ), input is made to the first axis (TM1), and the seventh axis (TM7) operates as a fixed element by the operation of the second brake (B2) and is set through the third axis (TM3). The output is made by shifting according to the gear ratio.

Then, the rotational power of the third shaft (TM3) is transmitted to the output shaft (OS) according to the gear ratio of the second transfer gear unit (TF2) so that forward three-speed travel is achieved.

[Forward 4th speed]

In the forward 4th speed gear D4, the first and fourth clutches C1 and C4 and the first brake are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the fifth shaft TM5 by the operation of the first clutch C1, and the third shaft TM3 is connected to the output shaft OS by the operation of the fourth clutch C4. ), input is made to the first axis (TM1), and the sixth axis (TM6) operates as a fixed element by the operation of the first brake (B1) and is set through the third axis (TM3). The output is made by shifting according to the gear ratio.

Then, the rotational power of the third shaft (TM3) is transmitted to the output shaft (OS) according to the gear ratio of the second transfer gear unit (TF2) so that forward 4-speed travel is achieved.

[Forward 5th speed]

In the forward 5th speed range D5, the first, second, and fourth clutches C1, C2, and C4 are operated simultaneously.

Accordingly, the fourth axis TM4 is the first. By the operation of the second clutches C1 and C2, the fifth shaft TM5 and the sixth shaft TM6 are fixedly connected to each other, and the third shaft TM3 is output by the operation of the fourth clutch C4. In the state of being fixedly connected to (OS), input is made to the first shaft (TM1), and output is made by shifting to a set gear ratio through the third shaft (TM3).

Then, the rotational power of the third shaft (TM3) is transmitted to the output shaft (OS) according to the gear ratio of the second transfer gear unit (TF2) so that the forward 5-speed travel is achieved.

[Forward 6th speed]

In the forward 6th speed range D6, the second and fourth clutches C2 and C4 and the first brake B1 are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the sixth shaft TM6 by the operation of the second clutch C2, and the third shaft TM3 is connected to the output shaft OS by the operation of the fourth clutch C4. ), input is made to the first axis (TM1), and the sixth axis (TM6) operates as a fixed element by the operation of the first brake (B1) and is set through the third axis (TM3). The output is made by shifting according to the gear ratio.

Then, the rotational power of the third shaft (TM3) is transmitted to the output shaft (OS) according to the gear ratio of the second transfer gear unit (TF2) so that forward driving at 6 speeds is achieved.

[Forward 7 speed]

In the forward 7th gear stage D7, the second and fourth clutches C2 and C4 and the second brake B2 are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the sixth shaft TM6 by the operation of the second clutch C2, and the third shaft TM3 is connected to the output shaft OS by the operation of the fourth clutch C4. ), input is made to the first axis (TM1), and the seventh axis (TM7) operates as a fixed element by the operation of the second brake (B2) and is set through the third axis (TM3). The output is made by shifting according to the gear ratio.

Then, the rotational power of the third shaft TM3 is transmitted to the output shaft OS according to the gear ratio of the second transfer gear unit TF2, so that forward 7-speed travel is achieved.

[Forward 8th speed]

In the forward 8th gear stage D8, the second clutch C2 and the first and second brakes B1 and B2 are operated simultaneously.

Accordingly, input is made to the first axis TM1 while the fourth axis TM4 is fixedly connected to the sixth axis TM6 by the operation of the second clutch C2, and the sixth axis TM6 and While the seventh shaft TM7 operates as a fixed element by the operation of the first and second brakes B1 and B2, it is shifted to a set gear ratio through the second shaft TM2 to produce an output.

Then, the rotational power of the second shaft (TM2) is transmitted to the output shaft (OS) according to the gear ratio of the first transfer gear unit (TF1) so that forward 8-speed travel is achieved.

[Forward 9th speed]

In the forward ninth speed range D9, the first and second clutches C1 and C2 and the second brake B2 are operated simultaneously.

Accordingly, the fourth axis TM4 is the first. Input is made to the first axis (TM1) while the fifth axis (TM5) and the sixth axis are fixedly connected to each other by the operation of the second clutch (C1) (C2), and the seventh axis (TM7) 2 It operates as a fixed element by the operation of the brake (B2) and shifts to the set gear ratio through the second shaft (TM2) to produce output.

Then, the rotational power of the second shaft (TM2) is transmitted to the output shaft (OS) according to the gear ratio of the first transfer gear unit (TF1) so that the forward 9-speed travel is achieved.

[Forward 10 speed]

In the forward 10-speed gearbox D10, the second and third clutches C2 and C3 and the second brake B2 are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the sixth shaft TM6 by the operation of the second clutch C2, and the third shaft TM3 is connected to the fifth shaft by the operation of the third clutch C3. In the state of being fixedly connected to (TM5), an input is made to the first axis (TM1), and the seventh axis (TM7) operates as a fixed element by the operation of the second brake (B2) and controls the second axis (TM2). The output is made by shifting to the set gear ratio through

Then, the rotational power of the second shaft (TM2) is transmitted to the output shaft (OS) according to the gear ratio of the first transfer gear unit (TF1) so that the vehicle travels at 10 forward speeds.

[Forward 11th speed]

In the 11th forward speed range D11, the first, second, and third clutches C1, C2, and C3 are operated simultaneously.

Accordingly, the fourth axis TM4 is the first. By the operation of the second clutches C1 and C2, the fifth shaft TM5 and the sixth shaft TM6 are fixedly connected, and the third shaft TM3 is controlled by the operation of the third clutch C3. In the state of being fixedly connected to the 5th axis TM5, an input is made to the 1st axis TM1 while shifting to a set gear ratio through the 2nd axis TM2 to output.

Then, the rotational power of the second shaft (TM2) is transmitted to the output shaft (OS) according to the gear ratio of the first transfer gear unit (TF1) so that the vehicle travels at 11 forward speeds.

[Forward 12 speed]

In the forward 12-speed gearbox D12, the second and third clutches C2 and C3 and the first brake B1 are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the sixth shaft TM6 by the operation of the second clutch C2, and the third shaft TM3 is connected to the fifth shaft by the operation of the third clutch C3. In the state of being fixedly connected to (TM5), an input is made to the first axis (TM1), and the sixth axis (TM6) operates as a fixed element by the operation of the first brake (B1) and controls the second axis (TM2). The output is made by shifting to the set gear ratio through

Then, the rotational power of the second shaft (TM2) is transmitted to the output shaft (OS) according to the gear ratio of the first transfer gear unit (TF1), so that forward traveling at 12 speeds is achieved.

[junior]

In the reverse gear REV, the second, third, and fourth clutches C2, C3, and C4 are operated simultaneously.

Accordingly, the fourth shaft TM4 is fixedly connected to the sixth shaft TM6 by the operation of the second clutch C2, and the third shaft TM3 is connected to the third and fourth clutches C3 and C4. In the state of being fixedly connected to the fifth shaft TM5 and the output shaft OS by operation, input is made to the first shaft TM1 and shifted to a set gear ratio through the third shaft TM3 to output.

Then, the rotational power of the third shaft TM3 is transmitted to the output shaft OS according to the gear ratio of the second transfer gear unit TF2 so that reverse driving is performed.

In the planetary gear train according to an embodiment of the present invention, three planetary gear sets are arranged on the same axis as the input shaft, and rotational power output from the three planetary gear sets in two paths is transmitted to the output shaft through two external gears. By allowing it to be transmitted, the overall length can be reduced and mountability can be improved.

In addition, the planetary gear train according to the embodiment of the present invention applies two transfer gear units in addition to the planetary gear set, so that the optimal gear ratio for each vehicle can be set by freely changing the number of gear teeth, and the gear ratio can be changed to meet the required performance conditions. By improving the start performance, it is possible to delete the existing torque converter and apply the start clutch.

In addition, the planetary gear train according to the embodiment of the present invention implements 12 forward speeds and 1 reverse speed, thereby improving power transmission performance and improving fuel efficiency according to multi-speeding.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be changed.

B1,B2... 1st, 2nd brake
C1, C2, C3, C4: 1st, 2nd, 3rd, 4th clutch
PG1,PG2,PG3... 1st, 2nd, 3rd planetary gear set
S1,S2,S3... 1st, 2nd, 3rd sun gear
PC1, PC2, PC3... 1st, 2nd, 3rd planetary carriers
R1,R2,R3... 1st, 2nd, 3rd ring gear
IS... input shaft
OS... output shaft
TM1, TM2, TM3, TM4, TM5, TM6, TM7... 1st, 2nd, 3rd, 4th, 5th, 6th, 7th axis

Claims (12)

an input shaft that receives engine power;
an output shaft disposed parallel to the input shaft to output power;
a first planetary gear set having first, second, and third rotating elements;
a second planetary gear set having fourth, fifth, and sixth rotating elements; and
A third planetary gear set having seventh, eighth, and ninth rotating elements;
a first shaft fixedly connected to the second rotational element and the sixth rotational element and fixedly connected to the input shaft;
a second shaft fixedly connected to the eighth rotating element and externally geared to the output shaft;
a third shaft fixedly connected to the first rotating element and selectively externally geared to the output shaft;
a fourth shaft fixedly connected to the third rotating element;
a fifth shaft fixedly connected to the fifth rotational element and the ninth rotational element;
a sixth shaft fixedly connected to the seventh rotating element and selectively connected to the transmission housing;
a seventh shaft fixedly connected to the fourth rotating element and selectively connected to the transmission housing;
a first transfer gear unit configured between the second shaft and the output shaft; and
a second transfer gear unit configured between the third shaft and the output shaft;
A planetary gear train of an automatic transmission for a vehicle comprising a. According to claim 1,
The planetary gear train
The planetary gear train of an automatic transmission for a vehicle wherein the fourth shaft is selectively connected to the fifth shaft and the sixth shaft, and the third shaft is selectively connected to the fifth shaft. delete According to claim 2,
The planetary gear train
a first clutch configured between the fourth shaft and the fifth shaft;
a second clutch configured between the fourth shaft and the sixth shaft;
a third clutch configured between the third shaft and the fifth shaft;
a fourth clutch configured between the third shaft and the output shaft;
a first brake configured between the sixth shaft and the transmission housing; and
a second brake configured between the seventh shaft and the transmission housing;
A planetary gear train of an automatic transmission for a vehicle further comprising a. delete According to claim 4,
The fourth clutch
A planetary gear train of an automatic transmission for a vehicle disposed between the output shaft and the second transfer gear unit. According to claim 1,
The first planetary gear set is composed of a single pinion planetary gear set, and the first, second, and third rotating elements are composed of a first sun gear, a first planetary carrier, and a first ring gear;
The second planetary gear set is composed of a single pinion planetary gear set, and the fourth, fifth, and sixth rotating elements are composed of a second sun gear, a second planet carrier, and a second ring gear,
The third planetary gear set is composed of a single pinion planetary gear set, and the seventh, eighth, and ninth rotating elements are composed of a third sun gear, a third planet carrier, and a third ring gear. an input shaft that receives engine power;
an output shaft disposed parallel to the input shaft to output power;
a first planetary gear set having first, second, and third rotating elements;
a second planetary gear set having fourth, fifth, and sixth rotating elements;
A third planetary gear set having seventh, eighth, and ninth rotating elements;
The first rotating element is selectively externally geared to the output shaft,
The second rotating element is fixedly connected to the input shaft and the sixth rotating element,
The fourth rotating element is selectively connected to the transmission housing,
The fifth rotation element is fixedly connected to the ninth rotation element, and is selectively connected to the first rotation element and the third rotation element, respectively;
The seventh rotating element is selectively connected to the third rotating element and the transmission housing,
The eighth rotating element is externally geared to the output shaft,
a first transfer gear unit configured between the eighth rotary element and the output shaft; and
a second transfer gear unit configured between the first rotating element and the output shaft;
Planetary gear train of an automatic transmission for a vehicle comprising a. delete According to claim 8,
The planetary gear train
a first clutch configured between the third rotation component and the fifth rotation component;
a second clutch configured between the third rotation component and the seventh rotation component;
a third clutch configured between the first rotating component and the fifth rotating component;
a fourth clutch configured between the first rotary element and the output shaft;
a first brake configured between the seventh rotating element and the transmission housing; and
a second brake configured between the fourth rotating element and the transmission housing;
A planetary gear train of an automatic transmission for a vehicle further comprising a. According to claim 10,
The fourth clutch
A planetary gear train of an automatic transmission for a vehicle disposed between the second transfer gear unit and the output shaft. According to claim 8,
The first planetary gear set is composed of a single pinion planetary gear set, and the first, second, and third rotating elements are composed of a first sun gear, a first planetary carrier, and a first ring gear;
The second planetary gear set is composed of a single pinion planetary gear set, and the fourth, fifth, and sixth rotating elements are composed of a second sun gear, a second planet carrier, and a second ring gear,
The third planetary gear set is composed of a single pinion planetary gear set, and the seventh, eighth, and ninth rotating elements are composed of a third sun gear, a third planet carrier, and a third ring gear.

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