KR20200015976A - Planetary gear train of automatic transmission for vehicles - Google Patents

Abstract

Disclosed is a planetary gear train of an automatic transmission for a vehicle which can improve power transfer performance and fuel efficiency. According to an embodiment of the present invention, the planetary gear train of an automatic transmission for a vehicle comprises: an input shaft to receive power of an engine; an output gear to output power; a first planetary gear set having a first, a second, and a third rotary element; a second planetary gear set having a fourth, a fifth, and a sixth rotary element; a third planetary gear set having a seventh, an eighth, and a ninth rotary element; a first shaft fixed and connected to the sixth rotary element and the ninth rotary element, and fixed and connected to the input shaft; a second shaft fixed and connected to the third rotary element, and fixed and connected to the output gear; a third shaft fixed and connected to the second rotary element and the fourth rotary element; a fourth shaft fixed and connected to the fifth rotary element and the eighth rotary element; a fifth shaft fixed and connected to the first rotary element; and a sixth shaft fixed and connected to the seventh rotary element.

Description

Planetary gear train of vehicle automatic transmission {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 of an automatic transmission for a vehicle that can improve power transmission performance and fuel efficiency by implementing a forward 9 speed shift stage with an optimized configuration.

In general, in the field of automatic transmission, the multi-stage of the gear stage is being researched as a technique for maximizing the fuel efficiency and driving performance of the vehicle, and the recent increase in oil prices is a factor that leads to infinite competition for fuel efficiency. have.

Accordingly, research is being conducted to reduce weight and improve fuel efficiency through down sizing, and to make driving and fuel economy competitive with automatic transmission using multiple gear stages. .

However, as the transmission speed increases, the automatic transmission increases the number of internal parts, especially the number of planetary gear sets, and thus, the mountability, production cost, weight, and power transmission efficiency may worsen as the transmission length increases.

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

In this respect, the automatic transmission is configured to implement a shift of more than eight speeds in the vehicle, and the research and development of the planetary gear train that can realize more shift stages is also required.

However, the general 8-speed or higher automatic transmission is mainly composed of three to four planetary gear sets and five to seven coupling elements (friction elements).

Accordingly, in order to make the gear shift stage of the automatic transmission multi-stage, recently, a double-row structure in which a planetary gear set is disposed on the planetary gear set or a dog clutch instead of a wet coupling element is applied, but the structure applicable to such a case is limited. There is a problem that accompanied by a deterioration of the shifting feeling due to the application of the dog clutch.

The matters described in this Background section are intended to enhance the understanding of the background of the invention, and may include matters not previously known to those of ordinary skill in the art.

An embodiment of the present invention is to provide a planetary gear train of an automatic transmission for a vehicle that can improve the power transmission performance and fuel economy by implementing a forward 9 speed shift stage with an optimized configuration.

In one or more embodiments of the present invention, the input shaft receives the power of the engine; An output gear for outputting 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 a seventh, eighth and ninth rotating element; A first shaft fixedly connected to the sixth rotating element and the ninth rotating element and fixedly connected to the input shaft; A second shaft fixedly connected to the third rotating element and fixedly connected to the output gear; A third shaft fixedly connected to the second rotating element and the fourth rotating element; A fourth shaft fixedly connected to the fifth rotating element and the eighth rotating element; A fifth shaft fixedly connected to the first rotating element; And a sixth shaft fixedly connected to the seventh rotation element, the planetary gear train of the vehicle automatic transmission may be provided.

In addition, the second axis and the fourth axis, the input axis and the fifth axis, the fourth axis and the fifth axis are selectively connected, respectively, the third axis, the fourth axis, the fifth axis, the sixth axis The shafts can each be selectively connected to a transmission housing.

The planetary gear train may include three clutches that selectively couple shafts to shafts; And four brakes selectively connecting the third, fourth, fifth, and sixth shafts to the transmission housing, respectively.

The three clutches may include a first clutch configured between the second shaft and the fourth shaft; A second clutch configured between the input shaft and the fifth shaft; And a third clutch configured between the fourth shaft and the fifth shaft, wherein the four brakes comprise: a first brake configured on the fifth shaft and the transmission housing; A second brake configured on the third shaft and the transmission housing; A third brake configured on the fourth shaft and the transmission housing; And a fourth brake configured on the sixth shaft and the transmission housing.

In addition, the first planetary gear set includes a double pinion planetary gear set, wherein the first, second, and third rotating elements include a first sun gear, a first planet carrier, and a first ring gear, and the second planet 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 planet gear set is a double pinion planetary gear. The seventh, eighth, and ninth rotating elements may include a third sun gear, a third planet carrier, and a third ring gear.

The planetary gear train according to the embodiment of the present invention may implement a forward 9 speed shift stage and a reverse 1 speed shift stage by combining three planetary gear sets consisting of a simple planetary gear set with seven coupling elements.

In addition, the planetary gear train according to an embodiment of the present invention can implement a shift speed appropriate to the engine speed through the multi-stage by implementing the forward 9 speed shift stage, and in particular, can greatly improve the power performance and fuel economy. .

In addition, the planetary gear train according to the embodiment of the present invention can implement the seventh speed shift stage by removing the first brake, and reduce the overall length because the fourth speed shift stage can be implemented by removing the first brake and the second clutch. And transmission modularity.

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

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

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to 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 or similar elements will be described with the same reference numerals throughout the specification.

In the following description, the names of the configurations are divided into first, second, and the like to distinguish the names of the configurations and are not necessarily limited to the order.

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

Referring to FIG. 1, a planetary gear train according to an exemplary embodiment of the present invention may include first, second and third planetary gear sets PG1, PG2, PG3, an input shaft IS, and an output disposed on the same axis. Six shafts TM1 to TM6 connecting the gears OG, the respective rotating elements of the first, second and third planetary gear sets PG1, PG2 and PG3, and three clutches C1 as coupling elements. (C2) (C3) and four brakes (B1) (B2) (B3) (B4), and the transmission housing (H).

In addition, rotational power from the engine input from the input shaft IS is shifted by the complementary operation of the first, second and third planetary gear sets PG1, PG2, and PG3 to thereby output the output gear OG. Is output via

In the embodiment of the present invention, each planetary gear set is arranged in the order of the third, second, and first planetary gear sets PG3, PG2, and PG1 from the engine side to the rear side.

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

The output gear OG is an output member and is transmitted through the input shaft IS to transmit the driving force to the drive shaft through a differential device (not shown).

The first planetary gear set PG1 is a double pinion planetary gear set. The first sun gear S1, which is a first rotating element N1, and two external gears are formed in pairs to form an internal external gear. A first planet carrier PC1, which is a second rotation element N2 that rotatably supports and rotates a plurality of first pinion gears P1 meshed externally with the sun gear S1, and the plurality of first ones. The pinion gear P1 includes a first ring gear R1 which is a third rotating element N3 which is meshed internally with an external external gear and is electrically connected to the first sun gear S1.

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 that are externally engaged with the second sun gear S2. The second sun gear is internally engaged with the second planet carrier PC2, which is the fifth rotating element N5 for rotatably supporting and rotating the gear P2, and the plurality of second pinion gears P2. And a second ring gear R2 which is a sixth rotating element N6 that is power connected to S2.

The third planetary gear set PG3 is a double pinion planetary gear set. The third sun gear S3, which is the seventh rotation element N7, and two external gears are formed in pairs to form an internal external gear. A third planet carrier PC3, which is an eighth rotation element N8 that rotationally supports and rotates a plurality of third pinion gears P3 meshed externally with the sun gear S3, and the plurality of third The third ring gear R3, which is a ninth rotating element N9 that is meshed internally with the external external gear of the pinion gear P3 and is electrically connected to the third sun gear S3, is included.

The first, second, and third planetary gear sets PG1, PG2, and PG3 have a second rotating element N2 fixedly connected to the fourth rotating element N4, and a fifth rotating element N5. ) Is fixedly connected to the eighth rotating element N8, and the sixth rotating element N6 is fixedly connected to the ninth rotating element N9 to operate while holding six axes TM1 to TM6 in total.

Looking at the configuration of the six axes (TM1 ~ TM6) in detail as follows.

The first shaft TM1 has a sixth rotating element {N6; Second ring gear R2} and ninth rotating element N9; Third ring gear (R3)} is fixedly connected to the input shaft (IS) is always operated as an input element.

The second axis TM2 includes a third rotating element N3; First ring gear (R1)} is fixedly connected to the output gear (OG) is always operated as an output element.

The third axis TM3 includes a second rotating element N2; First planet carrier PC1 and fourth rotating element N4; Second sun gear (S2)} is fixedly connected to, and selectively connected to the transmission housing (H) to operate as an optional fixing element.

The fourth shaft TM4 includes a fifth rotating element {N5; Second planet carrier PC2 and the eighth rotating element N8; Third planet carrier (PC3)} and is selectively connected to the second shaft (TM2) and the transmission housing (H), respectively.

The fifth axis TM5 has a first rotating element {N1; The first sun gear (S1)} is fixedly connected, and selectively connected to the input shaft (IS), the fourth shaft (TM4) and the transmission housing (H).

The sixth axis TM6 includes seventh rotating element N7; Third sun gear S3} and is fixedly connected to the transmission housing H.

Here, the six shafts TM1 to TM6 together with the rotating elements connected to fixedly connect or selectively connect a plurality of rotating elements among the rotating elements of the planetary gear sets PG1, PG2, and PG3. It may be a rotating member for transmitting power while rotating, and may be a rotating member for selectively connecting the rotating element with the transmission housing (H), or may be a fixing member for directly connecting and fixing the rotating element with the transmission housing (H). .

In addition, in the above description, a fixedly connected or similar term means that a plurality of rotating elements connected through a corresponding shaft including an input shaft and an output shaft and the corresponding shaft are connected to rotate without any difference in the number of revolutions. That is, the plurality of fixedly connected rotating elements and the corresponding axis rotate in the same rotation direction and rotation speed.

In addition, in the above description, the term "selectively connected" or the like is connected so that a plurality of axes, including an input shaft and an output shaft, are rotatably connected through the coupling element at the same rotational direction and rotational speed, or the corresponding shaft is the coupling element. Through it means that it is connected to be fixed to the transmission housing.

That is, when the coupling element selectively connects a plurality of axes, when the coupling element is operated, the plurality of axes rotate in the same rotation direction and rotational speed, and when the coupling element is released, the connection of the plurality of axes is released.

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

Here, the input shaft IS and the fifth shaft TM5 are selectively connected and power-connected, and the second shaft TM2 and the fourth shaft TM4 are selectively connected and power-connected, and the fourth shaft The TM4 and the fifth shaft TM5 are selectively connected and powered.

In addition, the third, fourth, fifth, and sixth shafts TM3, TM4, TM5, and TM6 are respectively connected to the transmission housing H and operated as selective fixing elements.

In addition, among the six shafts TM1 to TM6, three coupling elements, clutches C1, C2 and C3, are disposed at portions of the six shafts TM1 to TM6 that are selectively connected to each other including the input shaft IS.

In addition, four brakes B1, B2, B3, and B4 are disposed at a portion in which the shaft and the transmission housing H are selectively connected among the six shafts TM1 to TM6.

That is, the arrangement positions of the three clutches C1 to C3 and the four brakes B1 to B4, which are the seven coupling elements, are as follows.

The first clutch C1 is disposed between the second shaft TM2 and the fourth shaft TM4 to selectively connect the second shaft TM2 and the fourth shaft TM4 to transmit power.

The second clutch C2 is disposed between the input shaft IS and the fifth shaft TM5 to selectively connect the input shaft IS and the fifth shaft TM5 to transmit power.

The third clutch C3 is disposed between the fourth shaft TM4 and the fifth shaft TM5 to selectively connect the fourth shaft TM4 and the fifth shaft TM5 to transmit power.

The first brake B1 is disposed between the fifth shaft TM5 and the transmission housing H to selectively connect and fix the fifth shaft TM5 to the transmission housing H.

The second brake B2 is disposed between the third shaft TM3 and the transmission housing H to selectively connect and fix the third shaft TM3 to the transmission housing H.

The third brake B3 is disposed between the fourth shaft TM4 and the transmission housing H to selectively connect and fix the fourth shaft TM4 to the transmission housing H.

The fourth brake B4 is disposed between the sixth shaft TM6 and the transmission housing H to selectively connect and fix the sixth shaft TM6 to the transmission housing H.

Each coupling element comprising the first, second and third clutches C1, C2 and C3 and the first, second, third and fourth brakes B1, B2, B3 and B4. May be composed of a multi-plate hydraulic friction coupling unit operated by hydraulic pressure supplied from the hydraulic control device, and mainly a wet multi-plate hydraulic friction coupling unit is used, but from an electronic control device such as a dog clutch, an electronic clutch, a magnetic clutch, etc. It can be composed of a coupling unit that can be operated according to the electrical signal supplied.

2 is an operation table for each shift stage of a coupling element acting on the planetary gear train according to an exemplary embodiment of the present invention, and is an operation table for implementing a shift stage of 9 forward speeds and 1 reverse speed.

[1st forward]

In the forward 1 speed shift stage D1, the third clutch C3 and the second brake B2 are simultaneously operated.

Accordingly, the fourth shaft TM4 is input to the first shaft TM1 while the fourth shaft TM4 is connected to the fifth shaft TM5 by the operation of the third clutch C3.

In addition, the third shaft TM3 operates as a fixed element by the operation of the second brake B2 in the input state, and shifts to the first forward speed by the complementary operation of each of the shafts. It is output through the connected output gear (OG).

[2 speed forward]

In the second forward speed stage D2, the second clutch C2 and the second brake B2 are simultaneously operated.

Accordingly, while the fifth shaft TM5 is connected to the input shaft IS by the operation of the second clutch C2, simultaneous input to the first shaft TM1 and the fifth shaft TM5 is performed.

In the input state, the third shaft TM3 operates as a fixed element by the operation of the second brake B2, and the second shaft TM3 is shifted to the second forward speed by the complementary operation of each shaft. It is output through the connected output gear (OG).

[3 speed forward]

In the third forward speed stage D3, the first clutch C1 and the second brake B2 are simultaneously operated.

Accordingly, an input is made to the first shaft TM1 while the second shaft TM2 is connected to the fourth shaft TM4 by the operation of the first clutch C1.

In the input state, the third shaft TM3 operates as a fixed element by the operation of the second brake B2, and the third shaft TM3 is shifted to the third forward speed by the complementary operation of the respective shafts. It is output through the connected output gear (OG).

[4 forward speed]

In the forward four-speed shift stage D4, the first and second clutches C1 and C2 are operated simultaneously.

Accordingly, the second shaft TM2 is connected to the fourth shaft TM4 by the operation of the first clutch C1, and the fifth shaft TM5 is connected to the input shaft IS by the operation of the second clutch C2. In the state connected to the, simultaneous input to the first (TM1) and the fifth axis (TM5) is made.

Then, the first, second, and third planetary gear sets PG1, PG2, and PG3 are rotated to one, and the gear shift is performed at the fourth forward speed output as it is and is connected to the second shaft TM2. OG).

[5th forward]

In the fifth forward speed stage D5, the first clutch C1 and the first brake B1 are simultaneously operated.

Accordingly, an input is made to the first shaft TM1 while the second shaft TM2 is connected to the fourth shaft TM4 by the operation of the first clutch C1.

In addition, the fifth shaft TM5 operates as a fixed element by the operation of the first brake B1 in the input state, and shifts to the fifth forward speed by the complementary operation of the respective shafts. It is output through the connected output gear (OG).

[6th forward]

In the sixth forward speed stage D6, the first clutch C1 and the fourth brake B4 are operated at the same time.

Accordingly, an input is made to the first shaft TM1 while the second shaft TM2 is connected to the fourth shaft TM4 by the operation of the first clutch C1.

In the input state, the sixth shaft TM6 operates as a fixed element by the operation of the fourth brake B4, and the sixth shaft TM6 is shifted to six forward speeds by the complementary operation of the respective shafts. It is output through the connected output gear (OG).

[7th forward]

In the seventh forward speed stage D7, the first and fourth brakes B1 and B4 are simultaneously operated.

Accordingly, while the fifth shaft TM5 and the sixth shaft TM6 are operated as the fixing elements by the third and fourth brakes B3 and B4 while the input is made to the first shaft TM1. Complementary operation of each axis is shifted to the 7th forward speed, and is output through the output gear OG connected to the second axis TM2.

[8th forward]

In the eighth forward speed D8, the second clutch C2 and the fourth brake B4 are operated at the same time.

Accordingly, while the fifth shaft TM5 is connected to the input shaft IS by the operation of the second clutch C2, simultaneous input to the first shaft TM1 and the fifth shaft TM5 is performed.

In the input state, the sixth shaft TM6 is operated as a fixed element by the operation of the fourth brake B4, and the sixth shaft TM6 is shifted to eight forward speeds by the complementary operation of each shaft. It is output through the connected output gear (OG).

[9 speed forward]

In the forward 9 speed shift stage D9, the third clutch C3 and the fourth brake B4 are simultaneously operated.

Accordingly, the fourth shaft TM4 is input to the first shaft TM1 while the fourth shaft TM4 is connected to the fifth shaft TM5 by the operation of the third clutch C3.

In the input state, the sixth shaft TM6 operates as a fixed element by the operation of the fourth brake B4, and shifts to 9 forward speeds by the complementary operation of the respective shafts. It is output through the connected output gear (OG).

[apse]

In the reverse shift stage REV, the third clutch C3 and the third brake B3 are simultaneously operated.

Accordingly, the fourth shaft TM4 is input to the first shaft TM1 while the fourth shaft TM4 is connected to the fifth shaft TM5 by the operation of the third clutch C3.

In the input state, the fourth shaft TM4 is operated as the fixed element by the operation of the third brake B3, and the reverse gear shift is performed by the complementary operation of each of the shafts, and is connected to the second shaft TM2. Reverse rotation is output via (OG).

As described above, the planetary gear train according to the exemplary embodiment of the present invention may implement a forward 9 speed shift stage and a reverse 1 speed shift stage by combining three planetary gear sets consisting of a simple planetary gear set with seven coupling elements.

In addition, the planetary gear train according to an exemplary embodiment of the present invention implements a shift stage of 9 forward speeds and 1 reverse speed, thereby realizing a shift stage that is suitable for the engine speed through multi-stage, in particular, greatly improving power performance and fuel economy. Can be improved.

In addition, the planetary gear train according to an embodiment of the present invention, as shown in Figure 2, when the first brake (B1) of one of the seven coupling elements, one of the coupling elements, the seventh forward speed and the reverse one speed stage. If the second clutch C2 and the first brake B1, which are two of the seven coupling elements, are removed, a shift stage of four forward speeds and one reverse speed can be realized. Can contribute.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art that various modifications and changes within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below It will be understood that it can be changed.

B1, B2, B3, B4 ... first, second, third, fourth brake
C1, C2, C3 ... first, second, third clutch
IS ... input shaft
OG ... Output Gear
PG1, PG2, PG3 ... 1st, 2nd, 3rd planetary gear set
PC1, PC2, PC3 ... 1st, 2nd, 3rd planetary carrier
R1, R2, R3 ... first, second, third ring gear
S1, S2, S3 ... 1st, 2nd, 3rd Sun Gear
TM1, TM2, TM3, TM4, TM5, TM6 ... 1st, 2nd, 3rd, 4th, 5th, 6th Axis

Claims (9)

An input shaft receiving power of the engine;
An output gear for outputting 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 a seventh, eighth and ninth rotating element;
A first shaft fixedly connected to the sixth rotating element and the ninth rotating element and fixedly connected to the input shaft;
A second shaft fixedly connected to the third rotating element and fixedly connected to the output gear;
A third shaft fixedly connected to the second rotating element and the fourth rotating element;
A fourth shaft fixedly connected to the fifth rotating element and the eighth rotating element;
A fifth shaft fixedly connected to the first rotating element; And
A sixth shaft fixedly connected to the seventh rotating element;
Planetary gear train of a vehicle automatic transmission comprising a. The method of claim 1,
The second axis and the fourth axis, the input axis and the fifth axis, the fourth axis and the fifth axis are selectively connected to each other,
And the third shaft, the fourth shaft, the fifth shaft, and the sixth shaft are each selectively connected to a transmission housing. The method of claim 2,
The planetary gear train
Three clutches for selectively connecting the shaft and the shaft; And
Four brakes selectively connecting the third, fourth, fifth, and sixth axes to the transmission housing, respectively;
The planetary gear train of the vehicle automatic transmission further comprising a. The method of claim 3,
The three clutches
A first clutch configured between the second shaft and the fourth shaft;
A second clutch configured between the input shaft and the fifth shaft; And
And a third clutch configured between the fourth shaft and the fifth shaft,
The four brakes
A first brake configured on the fifth shaft and the transmission housing;
A second brake configured on the third shaft and the transmission housing;
A third brake configured on the fourth shaft and the transmission housing; And
The planetary gear train of the vehicle automatic transmission comprising a fourth brake configured on the sixth shaft and the transmission housing. The method of claim 1,
The first planetary gear set includes a double pinion planetary gear set, wherein the first, second, and third rotating elements include a first sun gear, a first planet carrier, and a first ring gear,
The second planetary gear set includes a single pinion planetary gear set, wherein the fourth, fifth, and sixth rotation elements include a second sun gear, a second planet carrier, and a second ring gear,
And the third planetary gear set includes a double pinion planetary gear set, wherein the seventh, eighth, and ninth rotating elements are a third sun gear, a third planet carrier, and a third ring gear. An input shaft receiving power of the engine;
An output gear for outputting 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 a seventh, eighth and ninth rotating element,
The first rotating element is selectively connected to the input shaft and the transmission housing, respectively,
The second rotating element is fixedly connected to the fourth rotating element and selectively connected to the transmission housing,
The third rotating element is fixedly connected to the output gear,
The fifth rotating element is fixedly connected to the eighth rotating element, and selectively connected to the first rotating element, the third rotating element and the transmission housing, respectively.
The sixth rotating element is fixedly connected to the ninth rotating element and fixedly connected to the input shaft,
The seventh rotating element is a planetary gear train of an automatic transmission for a vehicle selectively connected to the transmission housing. The method of claim 6,
The planetary gear train
Three clutches for selectively connecting the input shaft and the rotating element or the rotating element;
Four brakes selectively connecting the first rotating element, the second rotating element, the fifth rotating element, and the seventh rotating element to the transmission housing, respectively.
The planetary gear train of the vehicle automatic transmission further comprising a. The method of claim 7, wherein
The three clutches
A first clutch configured between the second rotating element and the fourth rotating element;
A second clutch configured between the input shaft and the fifth rotating element; And
A third clutch configured between the fourth rotating element and the fifth rotating element,
Chant four brakes
A first brake configured between the first rotating element and the transmission housing;
A second brake configured between the second rotating element and the transmission housing;
A third brake configured between the fifth rotating element and the transmission housing; And
A planetary gear train of an automatic transmission for a vehicle, comprising a fourth brake configured between the seventh rotating element and the transmission housing. The method of claim 6,
The first planetary gear set includes a double pinion planetary gear set, wherein the first, second, and third rotating elements include a first sun gear, a first planet carrier, and a first ring gear,
The second planetary gear set includes a single pinion planetary gear set, wherein the fourth, fifth, and sixth rotation elements include a second sun gear, a second planet carrier, and a second ring gear,
And the third planetary gear set includes a double pinion planetary gear set, wherein the seventh, eighth, and ninth rotating elements are a third sun gear, a third planet carrier, and a third ring gear.

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