KR102126230B1 - Automatic transmission for car - Google Patents

Abstract

Disclosed is an invention for a vehicle automatic transmission. The automatic transmission for a vehicle of the present invention includes: an input shaft receiving engine power, an output shaft installed at a position spaced apart from the input shaft, and outputting the shifted power; and a plurality of rotating elements connected to the input shaft and receiving power. A first planetary gear set, a second planetary gear set having a rotating element connected to the first planetary gear set, and a third planetary gear set having a rotating element connected to the second planetary gear set and connected to the output shaft, Four clutches and rotations connected to the first planetary gear set to the third planetary gear set to transmit power, and selectively connect the set elements of the rotation shaft part or selectively connect the set elements of the rotation shaft part and the input shaft. A multi-stage transmission stage including two brakes selectively connecting a transmission element and a set element of the shaft portion is implemented, and the clutch is characterized in that it is installed outside the first planetary gear set to the third planetary gear set.

Description

Automatic transmission for vehicles{AUTOMATIC TRANSMISSION FOR CAR}

The present invention relates to an automatic transmission for a vehicle, and more specifically, to implement a forward 8-speed reverse 1-speed transmission stage using three planetary gear sets, four clutches, and two brakes, outside the planetary gearset. It relates to an automatic transmission for a vehicle that can shorten the overall length by disposing the clutch.

In general, an automatic transmission is implemented by a combination of a plurality of planetary gear sets, and functions to automatically shift the rotational power transmitted from the torque converter in multiple stages and transmit it to the output shaft.

Since the automatic transmission has more gearboxes that can be implemented, not only is it possible to design a more appropriate transmission ratio, but also can implement a vehicle that is excellent in terms of power performance and fuel economy, and thus, steady research has been conducted to implement more gearboxes.

Even if the automatic transmission implements the same transmission stage, it has a different operation mechanism depending on the connection configuration of the rotating element consisting of the sun gear, the planet carrier, and the ring gear.

On the other hand, the automatic transmission implements a plurality of shift stages, but must satisfy the operating conditions of releasing one friction member and operating the other friction member during sequential shift from the viewpoint of shift control to the adjacent shift stage.

Conventionally, since the clutch is located between the planetary gear sets, the structure for supplying hydraulic pressure to the clutch is complicated, and there is a problem in that the length of the transmission is increased. Therefore, there is a need to improve this.

Background of the invention is disclosed in Republic of Korea Patent Publication No. 2008-0033789 (2008.04.17 published, the name of the invention: a 9-speed automatic transmission gear train for vehicles).

The present invention was created to improve the above problems, and the object of the present invention is to implement a forward 8-speed reverse 1-speed transmission stage using four planetary gear sets, four clutches, and two brakes. It is to provide an automatic transmission for a vehicle that can shorten the overall length by disposing a clutch on the outside of the gear set.

The automatic transmission for a vehicle according to the present invention includes: an input shaft receiving engine power, an output shaft installed at a position spaced apart from the input shaft, and outputting the shifted power; and a plurality of rotating elements connected to the input shaft and receiving power. A first planetary gearset, a second planetary gearset having a rotating element connected to the first planetary gearset, and a third planetary gearset having a rotating element connected to the second planetary gearset and connected to the output shaft. , Four planetary clutches connected to the first planetary gear set to the third planetary gear set for transmitting power, and selectively connecting the set elements of the rotating shaft part or selectively connecting the set elements of the rotating shaft part and the input shaft, and A multi-stage transmission stage including two brakes selectively connecting a set element of the rotating shaft and a transmission housing is implemented, and the clutch is characterized in that it is installed outside the first planetary gear set to the third planetary gear set.

In addition, the first planetary gear set is disposed between the first sun gear fixed to the transmission housing, the first ring gear connected to the second planetary gear set, and the first sun gear and the first ring gear and connected to the input shaft. Characterized in that it comprises a carrier.

In addition, the second planetary gear set is disposed between the second sun gear connected to the first ring gear, the second ring gear connected to the clutch, and the second sun gear and the second ring gear and connected to the third planetary gear set. It characterized in that it comprises a second carrier.

In addition, the third planetary gear set is disposed between the third sun gear connected to the clutch and the brake, the third ring gear connected to the output shaft, and the third sun gear and the third ring gear, and the third carrier connected to the second carrier. It characterized in that it comprises.

In addition, the rotary shaft unit includes a first rotary shaft connecting the first carrier and the clutch, a second rotary shaft connecting the first ring gear and the second sun gear, and a third rotary shaft connecting the second sun gear and the clutch, Characterized in that it comprises a fourth rotating shaft connecting the second carrier and the third carrier, a fifth rotating shaft connecting the second ring gear and the clutch, and a sixth rotating shaft connecting the third sun gear and the clutch and the brake. do.

In addition, the brake is characterized in that it comprises a first brake for selectively connecting the sixth rotary shaft and the transmission housing and a second brake for selectively connecting the fourth rotary shaft and the transmission housing.

In addition, the clutch includes a first clutch that selectively connects the third and sixth rotation shafts, a second clutch that selectively connects the fifth and sixth rotation shafts, and a first and fourth rotation shafts. It is characterized by including a third clutch for selectively connecting the shaft and a fourth clutch for selectively connecting the input shaft and the sixth rotary shaft.

In addition, the multi-stage transmission stage includes a reverse shift stage implemented by simultaneously operating the second brake and the first clutch, and a forward first-speed transmission stage implemented by simultaneously operating the second brake and the second clutch, and a first brake and a second clutch. Forward 2-speed gearbox implemented by simultaneous operation, forward 3-speed gearbox implemented by simultaneous operation of the first and second clutch, forward-speed 4-speed gearbox implemented by simultaneous operation of the second and fourth clutches, and The forward and fifth speed shift stages are implemented by simultaneously operating the second and third clutches, and the forward and six speed shift stages are implemented by simultaneously operating the third and fourth clutches, and the first and third clutches are simultaneously operated. It is characterized in that it comprises a forward 7-speed transmission stage and a forward 8-speed transmission stage implemented by operating the first brake and the third clutch simultaneously.

In addition, the present invention is characterized in that the third clutch is located outside the first planetary gear set, and the first clutch, the second clutch and the fourth clutch are located outside the third planetary gear set.

The automatic transmission for a vehicle according to the present invention can implement a forward 8-speed reverse 1-speed transmission stage using 3 planetary gear sets, 4 clutches, and 2 brakes.

In addition, according to the present invention, a clutch is not positioned between the first planetary gear set and the third planetary gear set, and a clutch is installed on the outside of the planetary gear set, so that the structure for supplying hydraulic pressure to the clutch is simplified to increase the length of the transmission. It can be shortened, and the number of parts can be reduced to reduce production cost.

1 is a configuration diagram schematically showing the structure of an automatic transmission for a vehicle according to an embodiment of the present invention.
2 is a configuration diagram schematically showing a structure in which the positions of the first planetary gear set and the third planetary gear set are changed according to an embodiment of the present invention.
3 is an operation table for each shift stage of an automatic transmission for a vehicle according to an embodiment of the present invention.

Hereinafter, an automatic transmission for a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition of these terms should be made based on the contents throughout the specification.

1 is a block diagram schematically showing the structure of an automatic transmission for a vehicle according to an embodiment of the present invention, and FIG. 2 shows the positions of the first planetary gear set and the third planetary gear set according to an embodiment of the present invention. It is a schematic view showing the changed structure, and FIG. 3 is an operation table for each transmission stage of the automatic transmission for a vehicle according to an embodiment of the present invention.

As shown in FIG. 1, the automatic transmission 1 for a vehicle according to an embodiment of the present invention is installed at a position spaced apart from the input shaft IS receiving the power of the engine and the input shaft IS An output shaft (OS) for outputting, a first planetary gear set (PG1) connected to the input shaft (IS) and receiving power and having a plurality of rotating elements, and a rotating element connected to the first planetary gear set (PG1) A second planetary gear set (PG2) having a, a third planetary gear set (PG3) having a rotating element connected to the second planetary gear set (PG2) and connected to the output shaft (OS), and a first planetary gear It is connected to the set (PG1) to the third planetary gear set (PG3) and transmits power to the rotation shaft portion (N), and selectively set elements of the rotation shaft portion (N) or selectively set the rotation shaft (N) A multi-stage transmission stage comprising four clutches selectively connecting the element and the input shaft (IS) and two brakes selectively connecting the set element of the rotary shaft part (N) and the transmission housing (H), and the clutch It is characterized in that it is installed on the outer side of the first planetary gear set (PG1) to the third planetary gear set (PG3).

Vehicle The automatic transmission 1 includes an input shaft IS, a first planetary gear set PG1, a second planetary gearset PG2, a third planetary gearset PG3, and an output shaft OS. Accordingly, the power 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, and then output through the output shaft OS.

The input shaft IS receiving the power of the engine is an input member, and the rotational power of the torque conversion is input through a torque converter input from the engine's crankshaft. The output shaft OS installed at a position spaced from the input shaft IS and outputting the shifted power is an output member, and transmits a driving force to drive a driving wheel through a differential device.

The first planetary gear set PG1 is connected to the input shaft IS and receives power, and various types of planetary gear devices can be used in the technical concept having a plurality of rotating elements. The first planetary gear set PG1 according to an embodiment of the present invention is disposed between the first sun gear S1, the first ring gear R1, and the first sun gear S1 and the first ring gear R1. It includes the first carrier (P1) to be meshed.

The first sun gear S1 is fixed to the transmission housing H. The first ring gear R1 is connected to the second sun gear S2 of the second planetary gear set PG2. In addition, the first carrier P1 is disposed between the first sun gear S1 and the first ring gear R1 and is connected to the input shaft IS. In addition, the first carrier P1 is connected to the third clutch C3 through the first rotation shaft N1.

The second planetary gear set PG2 includes a rotating element connected to the first planetary gear set PG1, and since a plurality of rotating elements are engaged and rotated, various types of planetary gear devices can be used within the technical idea of shifting. . The second planetary gear set PG2 according to an embodiment of the present invention is between the second sun gear S2, the second ring gear R2, and the second sun gear S2 and the second ring gear R2. It includes a second carrier (P2) to be meshed.

The second sun gear S2 is connected to the first ring gear R1 and the clutch. That is, the second sun gear S2 is connected to the first ring gear R1 through the second rotation shaft N2, and is connected to the first clutch C1 through the third rotation shaft N3. The second ring gear R2 is only connected to the clutch. The second ring gear R2 according to an embodiment is connected to the second clutch C2 through the fifth rotation shaft N5. The second carrier P2 is disposed between the second sun gear S2 and the second ring gear R2 and is connected to the third planetary gear set PG3. The second carrier P2 according to an embodiment is connected to the second brake B2 and the third clutch C3 through the fourth rotation shaft N4, and the third carrier of the third planetary gear set PG3 It is also connected to (P3).

The third planetary gear set PG3 includes a rotating element connected to the second planetary gear set PG2, and various modifications are possible within a technical idea connected to the output shaft OS. The third planetary gear set PG3 according to an embodiment is a third mesh gear S3, a third ring gear R3, and a third mesh gear S3 and the third ring gear R3. It includes three carriers (P3).

The third sun gear S3 is connected to the clutch and the brake. The third sun gear S3 according to one embodiment is connected to the first brake B1, the first clutch C1, the second clutch C2, and the fourth clutch C4 through the sixth rotation shaft N6. do.

The third ring gear R3 is connected to the output shaft OS, and the third carrier P3 is disposed between the third sun gear S3 and the third ring gear R3, and is connected to the second carrier P2. Connected. The third carrier P3 according to an embodiment is connected to the second carrier P2, the second brake B2, and the third clutch C3 through the fourth rotation shaft N4.

In the automatic transmission 1 for a vehicle according to an embodiment of the present invention, power is transmitted by eight rotating elements including an input shaft IS, an output shaft OS, and six rotation shafts. The rotation shaft part N is connected to the first planetary gear set PG1 to the third planetary gearset PG3 to transmit power. The number of rotation shafts provided in the rotation shaft unit N according to an embodiment is limited to six.

The first rotation shaft N1 connects a clutch to one rotation element of the first planetary gear set PG1. The first rotation shaft N1 according to an embodiment connects the first carrier P1 and the third clutch C3.

The second rotation shaft N2 always connects one rotation element of the first planetary gear set PG1 and one rotation element of the second planetary gear set PG2. The second rotation shaft N2 according to an embodiment always connects the first ring gear R1 and the second sun gear S2.

The third rotating shaft N3 connects one rotating element of the second planetary gear set PG2 and a clutch. The third rotation shaft N3 according to an embodiment connects the second sun gear S2 and the first clutch C1.

The fourth rotation shaft N4 connects one rotation element of the second planetary gear set PG2 and one rotation element of the third planetary gear set PG3. The fourth rotation shaft N4 according to an embodiment always connects the second carrier P2 and the third carrier P3, and is connected to the second brake B2 and the third clutch C3.

The fifth rotation shaft N5 connects one rotation element of the second planetary gear set PG2 and a clutch. The fifth rotation shaft N5 according to an embodiment connects the second ring gear R2 and the second clutch C2.

The sixth rotation shaft N6 connects one rotation element of the third planetary gear set PG3 and a brake. The sixth rotation shaft N6 according to an embodiment connects the third sun gear S3 and the first brake B1.

As for the brake, various types of brakes can be used within the technical idea of selectively connecting the transmission housing H with the set element of the rotary shaft part N. Two brakes are used in the automatic transmission 1 for a vehicle according to an embodiment, and these brakes include a first brake B1 and a second brake B2.

The first brake B1 and the second brake B2 are respectively fixed to the transmission housing H, and are selectively connected to or disconnected from the set rotation shaft part N.

The first brake B1 selectively connects or disconnects the sixth rotation shaft N6 and the transmission housing H. The second brake B2 selectively connects or disconnects the fourth rotation shaft N4 and the transmission housing H.

As the clutch, various types of clutches can be used within the technical idea of selectively connecting the set elements of the rotating shaft part N or selectively connecting the set elements of the rotating shaft part N and the input shaft IS. In the automatic transmission 1 for a vehicle according to an embodiment, four clutches are used, and these clutches include a first clutch C1, a second clutch C2, a third clutch C3, and a fourth clutch C4. Includes.

The first clutch C1 selectively connects or disconnects the third rotation shaft N3 and the sixth rotation shaft N6. The second clutch C2 selectively connects or disconnects the fifth rotation shaft N5 and the sixth rotation shaft N6. The third clutch C3 selectively connects or disconnects the first rotation shaft N1 and the fourth rotation shaft N4. The fourth clutch C4 selectively connects or disconnects the input shaft IS and the sixth rotation shaft N6.

The automatic transmission 1 for a vehicle according to an embodiment of the present invention has a first planetary gear set PG1 from the front toward the engine (left side in FIG. 1) toward the rear opposite to the direction in which the engine is installed (right in FIG. 1). ) And the second planetary gear set PG2 and the third planetary gear set PG3. Further, the third clutch C3 is located in front of the first planetary gear set PG1, and the first clutch C1, the second clutch C2, and the fourth clutch C4 are the third planetary gearset PG3. ).

Alternatively, as shown in FIG. 2, the automatic transmission 1 for a vehicle according to an embodiment of the present invention has a rear side (right side in FIG. 2) opposite to the direction in which the engine is installed from the front side (left side in FIG. 2) toward the engine. The third planetary gear set PG3, the second planetary gearset PG2, and the first planetary gearset PG1 are arranged in order. Also, the third clutch C3 is located behind the first planetary gear set PG1, and the first clutch C1, the second clutch C2, and the fourth clutch C4 are the third planetary gearset PG3. ).

That is, in the present invention, the third clutch C3 is located outside the first planetary gear set PG1, and the first clutch C1 and the second clutch C2 are located outside the third planetary gear set PG3. The fourth clutch (C4) is located, between the first planetary gear set (PG1) and the second planetary gear set (PG2) and between the second planetary gear set (PG2) and the third planetary gear set (PG3) The clutch is not located. Therefore, the working flow path connected to all clutches is simplified, and the length of the length of the automatic transmission 1 for a vehicle is shortened because the pipe extending from the transmission housing (H) is connected to the clutch, and the number of parts for supplying hydraulic pressure to the clutch is reduced. It also has a weight-reducing effect.

As shown in Figure 3, the automatic transmission 1 for a vehicle according to an embodiment of the present invention includes first, second, brakes B1, B2, first, second, third, Shifting is performed while the fourth clutches C1, C2, C3, and C4 are selectively operated.

The reverse shift stage is implemented by simultaneously operating the second brake B2 and the first clutch C1. The first forward speed shift stage is implemented by simultaneously operating the second brake B2 and the second clutch C2. The forward second speed shift stage is implemented by operating the first brake B1 and the second clutch C2 simultaneously. The forward third speed shift stage is implemented by simultaneously operating the first clutch C1 and the second clutch C2. The forward fourth speed shift stage is implemented by simultaneously operating the second clutch C2 and the fourth clutch C4. The forward 5-speed gearbox is implemented by simultaneously operating the second clutch C2 and the third clutch C3. The forward 6-speed transmission stage is implemented by simultaneously operating the third clutch C3 and the fourth clutch C4. The forward 7-speed transmission stage is implemented by operating the first clutch (C1) and the third clutch (C3) simultaneously. The forward 8-speed transmission stage is implemented by operating the first brake (B1) and the third clutch (C3) simultaneously.

As described above, according to the present invention, it is possible to implement an 8-speed reverse 1-speed shift stage using three planetary gear sets, four clutches, and two brakes. In addition, according to the present invention, a clutch is not positioned between the first planetary gear set PG1 and the third planetary gearset PG3, and a clutch is installed outside the planetary gearset, so that a structure for supplying hydraulic pressure to the clutch is provided. It can be simplified to shorten the transmission length of the transmission and reduce the production cost by reducing the number of parts.

The present invention has been described with reference to the embodiment shown in the drawings, but this is only exemplary, and those skilled in the art to which the art belongs understand that various modifications and other equivalent embodiments are possible therefrom. will be. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

1: Automatic transmission for vehicles
PG1,PG2,PG3: 1st, 2nd, 3rd planetary gear set
S1, S2, S3: First, second, third sun gear
P1,P2,P3: 1st, 2nd, 3rd carrier
R1,R2,R3: 1st, 2nd, 3rd ring gear
IS: Input shaft OS: Output shaft
H: Transmission housing
C1,C2,C3,C4: 1st, 2nd, 3rd, 4th clutch
B1,B2: 1st, 2nd brake
N: rotating shaft
N1,N2,N3,N4,N5,N6: 1st, 2nd, 3rd, 4th, 5th, 6th rotation shaft

Claims (9)

An input shaft receiving power of the engine;
An output shaft installed at a position spaced apart from the input shaft to output shifted power;
A first planetary gear set connected to the input shaft to receive power and having a plurality of rotating elements;
A second planetary gear set having a rotating element connected to the first planetary gear set;
A third planetary gear set having a rotating element connected to the second planetary gear set and connected to the output shaft;
A rotation shaft unit connected to the first planetary gear set to the third planetary gear set to transmit power;
Four clutches selectively connecting the set elements of the rotating shaft part or selectively connecting the set elements of the rotating shaft part and the input shaft; And
Two brakes for selectively connecting the set element and the transmission housing of the rotating shaft; to implement a multi-stage transmission stage comprising,
The clutch is installed on the outer side of the first planetary gear set to the third planetary gear set,
The first planetary gear set,
A first sun gear fixed to the transmission housing;
A first ring gear connected to the second planetary gear set; And
It is disposed between the first sun gear and the first ring gear, the first carrier connected to the input shaft; includes,
The second planetary gear set,
A second sun gear connected to the first ring gear;
A second ring gear connected to any one of the clutches; And
It is disposed between the second sun gear and the second ring gear, the second carrier connected to the third planetary gear set; includes,
The third planetary gear set,
A third sun gear connected to at least one of the four clutches and connected to any one of the two brakes;
A third ring gear connected to the output shaft; And
It is disposed between the third sun gear and the third ring gear, a third carrier connected to the second carrier; includes,
Four said clutches,
The first planetary gear set and the first to fourth clutches located outside the third planetary gear set,
The first clutch, the second clutch and the fourth clutch are located outside the third planetary gear set,
The third clutch is located outside the first planetary gear set,
The second ring gear is connected to the second clutch,
The third sun gear is connected to the first clutch, the second clutch and the fourth clutch,
The rotating shaft portion,
A first rotation shaft connecting the first carrier and the third clutch;
A second rotational shaft connecting the first ring gear and the second sun gear;
A third rotating shaft connecting the second sun gear and the first clutch;
A fourth rotating shaft connecting the second carrier and the third carrier;
A fifth rotation shaft connecting the second ring gear and the second clutch; And
It includes; a sixth rotation shaft connecting the third sun gear, the first clutch, the second clutch, the fourth clutch and any one of the two brakes; and
The brake,
A first brake selectively connecting the sixth rotation shaft and the transmission housing; And
It includes; a second brake for selectively connecting the fourth rotary shaft and the transmission housing;
The clutch,
The first clutch selectively connecting the third rotation shaft and the sixth rotation shaft;
The second clutch selectively connecting the fifth rotation shaft and the sixth rotation shaft;
The third clutch selectively connecting the first rotation shaft and the fourth rotation shaft; And
And the fourth clutch selectively connecting the input shaft and the sixth rotation shaft.
delete delete delete delete delete delete According to claim 1,
The multi-stage transmission stage includes: a reverse transmission stage implemented by simultaneously operating the second brake and the first clutch;
A forward speed shift stage implemented by simultaneously operating the second brake and the second clutch;
A forward second speed shift stage implemented by simultaneously operating the first brake and the second clutch;
A forward third speed shift stage implemented by simultaneously operating the first clutch and the second clutch;
A forward 4-speed transmission stage implemented by simultaneously operating the second clutch and the fourth clutch;
A forward 5-speed transmission stage implemented by simultaneously operating the second clutch and the third clutch;
A forward 6-speed transmission stage implemented by simultaneously operating the third clutch and the fourth clutch;
A forward 7-speed transmission stage implemented by simultaneously operating the first clutch and the third clutch; And
The first brake and the third clutch is a vehicle automatic transmission, characterized in that it comprises a; forward 8-speed transmission is implemented by operating at the same time.
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