KR102575180B1 - 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 gear that outputs 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; a first shaft fixedly connected to the sixth rotational element and the ninth rotational 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.

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 of an automatic transmission for a vehicle capable of improving power transmission performance and fuel efficiency by implementing a forward 9-speed gear with an optimized 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 is to provide a planetary gear train of an automatic transmission for vehicles capable of improving power transmission performance and fuel efficiency according to multi-speed shift stages by implementing 9 forward shift stages with an optimized configuration.

In one or more embodiments of the present invention, the input shaft receiving the power of the engine; an output gear that outputs 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; a first shaft fixedly connected to the sixth rotational element and the ninth rotational 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 planetary gear train of an automatic transmission for a vehicle including a sixth shaft fixedly connected to the seventh rotational element may be provided.

In addition, the second axis and the fourth axis, the input shaft and the fifth axis, and the fourth axis and the fifth axis are selectively connected, respectively, and the third axis, the fourth axis, the fifth axis, and the sixth axis Each of the shafts can be selectively connected to the transmission housing.

The planetary gear train includes three clutches selectively connecting shafts to shafts; and four brakes selectively connecting each of the third, fourth, fifth, and sixth shafts to the transmission housing.

Here, the three clutches 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 include a first brake configured between the fifth shaft and the transmission housing; a second brake formed on the third shaft and the transmission housing; a third brake formed on the fourth shaft and the transmission housing; and a fourth brake formed on the sixth shaft and the transmission housing.

In addition, the first planetary gear set is composed of a double 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 double 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 the embodiment of the present invention, three planetary gear sets composed of simple planetary gear sets can be combined with seven coupling elements to realize 9 forward gears and 1 reverse gear or more.

In addition, the planetary gear train according to the embodiment of the present invention implements a forward 9-speed shift stage, so that a shift stage suitable for the number of revolutions of the engine can be implemented through multiple stages, and in particular, power performance and fuel efficiency can be greatly improved. .

In addition, the planetary gear train according to the embodiment of the present invention can implement a forward 7-speed shift by removing the first brake, and implement a forward 4-speed shift by removing the first brake and the second clutch, thereby reducing the overall length. And it can contribute to transmission modularization.

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, in the planetary gear train according to an embodiment of the present invention, first, second, and third planetary gear sets PG1, PG2, and PG3, an input shaft IS, and an output are disposed on the same axis. Gear (OG), six shafts (TM1 to TM6) connecting each rotating element of the first, second, and third planetary gear sets (PG1, PG2, and PG3), and three clutches (C1) as coupling elements ) (C2) (C3), four brakes (B1) (B2) (B3) (B4), and a transmission housing (H).

Further, rotational power from the engine input from the input shaft IS is shifted by mutually complementary operations of the first, second, and third planetary gear sets PG1, PG2, and PG3 to drive the output gear OG. output through

In the embodiment of the present invention, each planetary gear set is disposed 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 a crankshaft of an engine may be converted into torque through a torque converter and input.

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

The first planetary gear set PG1 is a double pinion planetary gear set, and consists of a first sun gear S1 as a first rotating element N1 and two external gears, and the inner external gear is the first planetary gear set. a first planetary carrier PC1 as a second rotating element N2 that rotates and supports a plurality of first pinion gears P1 circumscribed with the sun gear S1 to rotate and revolve; Among the pinion gears (P1), a first ring gear (R1), which is a third rotating element (N3), is internally meshed with an external external gear and is power-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 externally meshed with the second sun gear S2. The second sun gear is internally meshed with the second planetary carrier PC2, which is the fifth rotating element N5 that rotates and supports the gear P2 to rotate and revolve, and the plurality of second pinion gears P2. (S2) and the second ring gear (R2) as a sixth rotating element (N6) connected by power.

The third planetary gear set PG3 is a double pinion planetary gear set, and consists of a third sun gear S3, which is the seventh rotating element N7, and two external gears, and the inner external gear is the third planetary gear set. a third planetary carrier (PC3) as an eighth rotating element (N8) that rotates and supports a plurality of third pinion gears (P3) externally meshed with the sun gear (S3) to rotate and revolve; A third ring gear R3, which is a ninth rotating element N9, is internally meshed with an outer external gear of the pinion gear P3 and is power-connected to the third sun gear S3.

Here, in the first, second, and third planetary gear sets PG1, PG2, and PG3, the second rotation element N2 is fixedly connected to the fourth rotation element N4, and the fifth rotation 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 a total of six shafts (TM1 to TM6).

A detailed configuration of the six axes TM1 to TM6 is as follows.

The first shaft TM1 includes a sixth rotating element {N6; the second ring gear R2} and the ninth rotating element {N9; It is fixedly connected to the third ring gear (R3)} and is fixedly connected to the input shaft (IS) to always operate as an input element.

The second shaft TM2 includes a third rotating element {N3; It is fixedly connected to the first ring gear (R1)} and is fixedly connected to the output gear (OG) to always operate as an output element.

The third shaft TM3 includes a second rotating element {N2; the first planetary carrier PC1} and the fourth rotating element {N4; It is fixedly connected to the second sun gear S2} and is selectively connected to the transmission housing H to operate as a selective fixing element.

The fourth shaft TM4 includes a fifth rotating element {N5; the second planetary carrier PC2} and the eighth rotating element {N8; It is fixedly connected to the third planetary carrier (PC3)} and selectively connected to the second shaft (TM2) and the transmission housing (H).

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

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.

Here, the six shafts TM1 to TM6 are fixedly connected to or selectively connected to a plurality of rotation elements among the rotation elements of the planetary gear sets PG1, PG2, and PG3. 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.

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

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

Among the six axes TM1 to TM6, three coupling elements, clutches C1, C2, and C3, are disposed at portions where the axes are selectively connected to each other, including the input shaft IS.

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

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 so that power is transmitted.

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 so that power is transmitted.

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 so that power is transmitted.

The first brake B1 is disposed between the fifth shaft TM5 and the transmission housing H, and selectively connects and fixes 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, and selectively connects and fixes 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, and selectively connects and fixes 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, and selectively connects and fixes the sixth shaft TM6 to the transmission housing H.

Each coupling element composed of 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 a hydraulic control device, and a wet multi-plate hydraulic friction coupling unit is mainly used, but from an electronic control device such as a dog clutch, an electromagnetic clutch, a magnetic particle clutch, etc. It may be made of a coupling unit that can be operated according to the supplied electrical signal.

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, when a shift stage of 9 forward and 1 reverse speed is implemented.

[Forward 1 speed]

In the first forward speed range D1, the third clutch C3 and the second brake B2 are operated simultaneously.

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

And, in the above input state, the third shaft TM3 operates as a fixed element by the operation of the second brake B2, and shifts to forward 1 speed by the mutual complementary operation of each shaft, so that the second shaft TM2 and It is output through the connected output gear (OG).

[Forward 2nd speed]

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

Accordingly, in a state in which the fifth axis TM5 is connected to the input shaft IS by the operation of the second clutch C2, simultaneous input is made to the first axis TM1 and the fifth axis TM5.

In the above input state, the third shaft TM3 operates as a fixed element by the operation of the second brake B2, and shifts to the forward 2 speed by the mutual complementary operation of each axis, and the second shaft TM2 and It is output through the connected output gear (OG).

[Forward 3rd speed]

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

Accordingly, 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.

And, in the above input state, the third shaft TM3 operates as a fixed element by the operation of the second brake B2, and shifts to the forward 3rd speed by the mutual complementary operation of each axis, so that the second shaft TM2 and It is output through the connected output gear (OG).

[Forward 4th speed]

In the forward 4th speed gear 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 , simultaneous input is made to the first (TM1) and fifth axis (TM5).

Then, the first, second, and third planetary gear sets PG1, PG2, and PG3 are rotated as one, and the gear is shifted to forward 4 speeds that are output as input, and the output gear connected to the second shaft TM2 ( OG).

[Forward 5th speed]

In the forward 5th speed range D5, the first clutch C1 and the first brake B1 are operated simultaneously.

Accordingly, 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 above input state, the 5th axis TM5 operates as a fixed element by the operation of the 1st brake B1, and shifts to the forward 5th speed by the mutually complementary operation of each axis, so that the 2nd axis TM2 and It is output through the connected output gear (OG).

[Forward 6th speed]

In the forward 6th speed range D6, the first clutch C1 and the fourth brake B4 are operated simultaneously.

Accordingly, 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 above input state, while the sixth shaft TM6 operates as a fixed element by the operation of the fourth brake B4, it is shifted to 6 forward speeds by mutually complementary operation of each shaft, and the second shaft TM2 and It is output through the connected output gear (OG).

[Forward 7 speed]

In the forward 7th speed gear D7, the first and fourth brakes B1 and B4 are operated simultaneously.

Accordingly, while the fifth axis TM5 and the sixth axis TM6 operate as fixed elements by the operation of the third and fourth brakes B3 and B4 in the state where input is made to the first axis TM1, By the mutually complementary operation of each axis, the shift is made to the forward 7 speed and is output through the output gear (OG) connected to the second axis (TM2).

[Forward 8th speed]

In the forward 8th speed gear D8, the second clutch C2 and the fourth brake B4 are operated simultaneously.

Accordingly, in a state in which the fifth axis TM5 is connected to the input shaft IS by the operation of the second clutch C2, simultaneous input is made to the first axis TM1 and the fifth axis TM5.

In the above input state, the 6th shaft TM6 operates as a fixed element by the operation of the 4th brake B4, and shifts to 8 forward speeds by the mutually complementary operation of each axis, so that the 2nd shaft TM2 and It is output through the connected output gear (OG).

[Forward 9th speed]

In the forward ninth speed range D9, the third clutch C3 and the fourth brake B4 are operated simultaneously.

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

In the above input state, the 6th shaft TM6 operates as a fixed element by the operation of the 4th brake B4, and shifts to 9 forward speeds by the mutually complementary operation of each axis, so that the 2nd shaft TM2 and It is output through the connected output gear (OG).

[junior]

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

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

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

As described above, the planetary gear train according to the embodiment of the present invention can implement 9 forward gears and 1 reverse gear by combining 3 planetary gear sets consisting of simple planetary gear sets with 7 coupling elements.

In addition, the planetary gear train according to an embodiment of the present invention implements gear stages of 9 forward speeds and 1 reverse speed, so that gear stages suitable for the number of revolutions of the engine can be implemented through multi-speed, and in particular, power performance and fuel efficiency are greatly improved. can improve

In addition, in the planetary gear train according to an embodiment of the present invention, as shown in FIG. 2, when one of the seven coupling elements, the first brake B1, which is one coupling element, is removed, the shift stages of 7 forward and 1 reverse gear are changed. and by removing the second clutch (C2) and the first brake (B1), which are two coupling elements among the seven coupling elements, it is possible to realize gear stages of four forward speeds and one reverse speed, thereby reducing the electric field and modularizing the transmission. can contribute

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, B3, B4... 1st, 2nd, 3rd, 4th brakes
C1, C2, C3... 1st, 2nd, 3rd clutch
IS... input shaft
OG... output gear
PG1,PG2,PG3... 1st, 2nd, 3rd planetary gear set
PC1, PC2, PC3... 1st, 2nd, 3rd planetary carriers
R1,R2,R3... 1st, 2nd, 3rd 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 that receives engine power;
an output gear that outputs power;
a first planetary gear set comprising a first sun gear, a first planetary carrier, and a first ring gear;
a second planetary gear set in which the fourth, fifth, and sixth rotating elements include a second sun gear, a second planet carrier, and a second ring gear;
a third planetary gear set in which the seventh, eighth, and ninth rotating elements include a third sun gear, a third planet carrier, and a third ring gear;
a first shaft fixedly connected to the sixth rotational element and the ninth rotational 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
Including a sixth shaft fixedly connected to the seventh rotation element,
The second axis and the fourth axis, the input shaft and the fifth axis, and the fourth axis and the fifth axis are selectively connected, respectively;
The planetary gear train of an automatic transmission for a vehicle wherein the third, fourth, fifth, and sixth axes are selectively connected to the transmission housing, respectively. delete delete According to claim 1,
The planetary gear train
a first clutch configured between the second shaft and the fourth shaft;
a second clutch configured between the input shaft and the fifth shaft;
a third clutch configured between the fourth shaft and the fifth shaft;
a first brake formed on the fifth shaft and the transmission housing;
a second brake formed on the third shaft and the transmission housing;
a third brake formed on the fourth shaft and the transmission housing; and
a fourth brake formed on the sixth shaft and the transmission housing;
A planetary gear train of an automatic transmission for a vehicle further comprising a. According to claim 1,
The first and third planetary gear sets are made of double pinion planetary gear sets, and the second planetary gear set is made of single pinion planetary gear sets. an input shaft that receives engine power;
an output gear that outputs power;
a first planetary gear set comprising a first sun gear, a first planetary carrier, and a first ring gear;
a second planetary gear set in which the fourth, fifth, and sixth rotating elements include a second sun gear, a second planet carrier, and a second ring gear;
The seventh, eighth, and ninth rotating elements include a third planetary gear set composed of a third sun gear, a third planet carrier, and a third ring gear;
The first rotating element is selectively connected to the input shaft and the transmission housing,
The second rotating element is fixedly connected to the fourth rotating element and is selectively connected to the transmission housing,
The third rotating element is fixedly connected to the output gear,
The fifth rotational element is fixedly connected to the eighth rotational element, and is selectively connected to the first rotational element, the third rotational element, and the transmission housing, respectively.
The sixth rotation element is fixedly connected to the ninth rotation 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 a transmission housing. delete According to claim 6,
The planetary gear train
a first clutch configured between the third rotation component and the fifth rotation component;
a second clutch configured between the input shaft and the first rotating element;
a third clutch configured between the first rotating component and the fifth rotating component;
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 fourth brake configured between the seventh rotating element and the transmission housing;
A planetary gear train of an automatic transmission for a vehicle further comprising a. According to claim 6,
The first and third planetary gear sets are made of double pinion planetary gear sets, and the second planetary gear set is made of single pinion planetary gear sets.

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