DE102015204600A1 - Transmission for a motor vehicle and method of operating such - Google Patents

Abstract

The invention relates to a transmission, in particular dual-clutch transmission, for a motor vehicle, comprising at least two partial transmissions, wherein each of the partial transmission comprises at least one input shaft and wherein an output shaft is arranged as the output shaft of both partial transmission and wherein the at least two input shafts are arranged on an input shaft axis and the output shaft on the input shaft axis or on a countershaft axis or output shaft axis parallel to the input shaft axis, and wherein a countershaft is arranged with at least one countershaft, the at least one countershaft being arranged on said countershaft axis and at least one of the input shafts being at least one gear plane and / or or at least one switching element with the output shaft is connectable, wherein at most five wheel planes and at most five switching devices are arranged such that at least nine forward are represented by the transmission.

Description

The present invention relates to a transmission, in particular a double clutch transmission, for a motor vehicle, comprising at least two partial transmissions, wherein each of the partial transmissions comprises at least one input shaft and wherein an output shaft is arranged as the output shaft of both partial transmissions and wherein the at least two input shafts are arranged on an input shaft axis and the Output shaft is arranged on the input shaft axis or on a countershaft axis or output shaft axis, in particular parallel to the input shaft axis, and wherein a countershaft is arranged with at least one countershaft, wherein the at least one countershaft is arranged on said countershaft axis and wherein at least one of the input shafts by means of at least one wheel plane and / or at least one switching element with the output shaft is connectable.

The present invention also relates to a method of operating a transmission according to any one of claims 1-21.

The present invention further relates to a motor vehicle, in particular a passenger or a truck with a transmission.

Such transmissions for a motor vehicle are designed, inter alia, as so-called dual-clutch transmissions in which the input shafts of the two partial transmissions can each be connected via an associated power-shift element to a drive, for example an internal combustion engine or an electric motor, the two power-shifting elements being combined in the form of a double clutch , The representable about such a gear ratios are then alternately divided between the two partial transmissions, so that, for example, a partial transmission, the odd gears and the corresponding other partial transmission represents the even gears. It is also known to represent the individual gear stages by one or more wheel stages or planes, each having different gear ratios. By means of corresponding switching elements, these can be incorporated into the force or torque flux between the drive and output, so that a corresponding desired ratio between the drive and output of the transmission is shown in each case.

By alternately splitting the gears on the two partial transmissions, it is possible to already select a subsequent gear when driving in a gear assigned to a sub-gear in the other sub-transmission by appropriate actuation of the switching devices, with a final change in the subsequent gear by opening the Power shift element of a partial transmission and a subsequent subsequent closing of the load switching element of the other sub-transmission is made possible. In this way, the gears or gear ratios of the transmission can be switched under load, which improves an acceleration capacity of the motor vehicle due to a substantially traction-free gear change and allows more comfortable switching operations for a driver.

Such dual-clutch transmissions can in this case also be designed with a countershaft additionally arranged for input and output, so that a compact construction is made possible in the axial direction.

From the DE 10 2012 220 686 A1 a transmission for a motor vehicle in the form of a dual-clutch transmission has become known. The dual-clutch transmission is designed in countershaft design with an input shaft axis and a countershaft axis, the output takes place on the countershaft. By means of the double gear nine forward gears can be displayed. For this purpose, the transmission has eight wheel planes and nine shift elements.

The disadvantage here is that this gear takes up a large amount of space.

It is therefore an object of the present invention to provide a transmission which is more compact without reducing the number of gears that can be represented by the transmission and without increasing the number of shift elements for displaying the various gears.

The invention solves the problem in a transmission, in particular dual-clutch transmission, for a motor vehicle, comprising at least two partial transmissions, wherein each of the partial transmission comprises at least one input shaft and wherein an output shaft is arranged as the output shaft of both partial transmission and wherein the at least two input shafts are arranged on an input shaft axis and the output shaft is arranged on the input shaft axis or on a countershaft axis or output shaft axis parallel to the input shaft axis, and wherein a countershaft is arranged with at least one countershaft, wherein the at least one countershaft is arranged on said countershaft axis and wherein at least one of the input shafts by means of at least one Wheel plane and / or at least one switching element with the output shaft is connectable, characterized in that at most five forward gear and at most five switching devices arranged such si nd, so that at least nine forward gears are represented by the transmission.

The present invention also achieves the object in a method for operating a transmission according to one of claims 1-21, characterized in that a first gear is represented by actuated second, sixth and eighth switching element and that a second gear represented by actuated second and eighth switching element is that, and that a third gear is represented by actuated second and fifth switching element and that a fourth gear is represented by actuated second and seventh switching element, and that a fifth gear is represented by means of actuated first switching element, and that a sixth gear by means of actuated fourth and eighth switching element is shown, and that a seventh gear by means of actuated fourth and fifth switching element is shown, and that an eighth gear by means of actuated fourth and seventh switching element is shown, and that a ninth gear by means of actuated third and fourth Schaltelem ent is shown, in each case the other switching elements are open or are in neutral position and wherein a first clutch is closed in the even gears and a second clutch is closed in the odd gears and the other clutch is open.

The invention solves the problem also in a motor vehicle, in particular a passenger or a truck with a transmission according to one of claims 1-21 and / or operated with a method according to any one of claims 22-23.

The term "wheel stage" or "wheel plane" are preferably to be understood in the description, in particular in the claims, essentially two mutually cooperating transmission elements for transmitting torques from the one transmission element to the other transmission element, preferably a sub- or translation for provide in particular with the transmission elements cooperating waves in the transmission.

The term "switching element" is preferably in the description, in particular in the claims, a device having at least one open and a closed state, wherein in the open state, the device no torque and wherein in the closed state, the device torque between two can transmit with this device or the switching element cooperating other devices or transmission elements.

The term "transmission element" is preferably in the description, in particular in the claims to understand a device with which force and / or torques are transferable. Transmission elements can preferably be designed as wheels, preferably as gears, in particular spur gears, bevel gears, worm wheels or the like.

The term "adjacent" with respect to switching elements switching devices and / or wheel planes are preferably understood in the description, in particular in the claims switching devices, switching elements and / or wheel planes, along the input shaft axis or the countershaft axis of the transmission directly adjacent to each other along the respective axis are arranged and wherein in the case of switching devices or switching elements each one of the switching elements of the switching means is connected by a shaft directly to the respective other switching element of the adjacent switching device.

A torque or a rotational movement of a drive shaft, for example of an internal combustion engine, is preferably introduced into the transmission via the drive shaft.

Under a shaft is not exclusive to understand, for example, a cylindrical, rotatably mounted machine element for transmitting torque, but these are also general connecting elements to understand that connect individual components or elements together, in particular connecting elements that connect a plurality of elements rotationally fixed to each other.

Two elements are referred to in particular as connected to each other, if between the elements a solid, in particular rotationally fixed connection exists. In particular, such connected elements rotate at the same speed.

Two elements will be referred to as connectable if there is a detachable connection between these elements. In particular, such elements rotate at the same speed when the connection is made.

The various components and elements can be connected to each other via a shaft or a connecting element, but also directly, for example by means of a welding, pressing or other connection.

Under a clutch is preferably in the description, in particular in the claims, a switching element to understand, which, depending on the operating state, a relative movement between two components permits or represents a connection for transmitting torque. Under a relative movement, for example, to understand a rotation of two components, wherein the rotational speed of the first component and the rotational speed of the second component differ from each other. In addition, is also the Rotation of only one of the two components conceivable while the other component is stationary or rotating in the opposite direction.

Hereinafter, a non-actuated clutch is understood to mean an opened clutch. This means that a relative movement between the two components is possible. When the clutch is actuated or closed, the two components accordingly rotate at the same speed in the same direction.

Particularly preferably, the switching elements are selectively, ie individually and as needed operable, whereby different gears can be realized by different ratios between the drive shaft and the output shaft. The higher the number of gears, the finer a gear ratio can be realized at a large transmission spread and thus, for example, an internal combustion engine of a motor vehicle in an optimal speed range and thus be operated as economically as possible. At the same time this contributes to an increase in ride comfort, since the internal combustion engine is preferably operable at a low speed level. For example, noise emissions resulting from the operation of the internal combustion engine are also reduced.

Furthermore, the switching elements may be designed such that energy is needed for a change of a switching state of the switching elements, but not for maintaining the switching state itself.

For this purpose, switching elements which can be actuated as required in a particular manner, such as, for example, electromechanical switching elements or electromagnetic switching elements, are suitable for this purpose. They are characterized, in particular in comparison to conventionally hydraulically actuated switching elements, by a particularly low and efficient energy requirements, since they are virtually lossless operable. In addition, it can be advantageously omitted to permanently maintain a control pressure for the operation of, for example, conventionally hydraulic switching elements, or to act on the respective switching element in the switched state permanently with the required hydraulic pressure. As a result, for example, other components such as a hydraulic pump can be omitted, as far as they are used exclusively for controlling and supplying the conventionally hydraulically actuated switching elements. If the supply of additional components with lubricants does not take place via a separate lubricant pump but via the same hydraulic pump, then this can be dimensioned at least to a smaller extent. Also, any leaks occurring at oil transfer points of the hydraulic circuit, especially in rotating components eliminated. This also particularly preferably contributes to an increase in efficiency of the transmission in the form of a higher efficiency.

When using demand-actuated switching elements of the above type, it is particularly advantageous if they are easily accessible from the outside. This has the advantage, inter alia, that the required switching energy can be well supplied to the switching elements. Therefore, switching elements are particularly well preferably arranged so that they are easily accessible from the outside. Well accessible from the outside means in the sense of the switching elements, which are arranged between the housing of the transmission and the switching element no further components, or that the switching elements are particularly preferably arranged on the drive shaft or on the output shaft.

The term "bondability" is preferably to be understood in the description, in particular in the claims, that in the case of a different geometric position, the same connection or binding of interfaces is ensured without individual connecting elements or waves crossing each other.

Further advantageous embodiments, features and advantages of the invention are described in the subclaims.

Conveniently, at least five wheel planes are arranged. The advantage here is that it can be provided in a simple manner at least nine forward gears available.

Advantageously, the plurality of switching devices each comprise two switching elements. In this way, the overall space for the switching elements is further reduced in size, since these can be combined in switching devices.

Conveniently, the plurality of switching devices and / or the plurality of switching elements is arranged on the countershaft axis. This makes the transmission on the input shaft axis particularly simple and compact.

Advantageously, all switching devices on the countershaft axis each comprise two switching elements. Thus, the space can be made even more compact in terms of switching elements on the countershaft axis.

Conveniently, at least one switching device is formed so that by means of this a transmission element of a wheel plane on an axis of the transmission with different Shafts on the same axis of the transmission is connectable. This increases the flexibility with regard to the representations of different gears through said switching device (s), so that a sufficient number of gears can be made available. In the following, "switching device" is to be understood as a switching device by means of which a transmission element of a wheel plane on an axis of the transmission with different waves on the same axis of the transmission is connectable.

Conveniently, at least two, in particular exactly two of said switching devices are arranged. Thus, the manufacturing cost of the transmission is not significantly increased overall, since other switching elements or switching devices can be performed conventionally.

Conveniently, the at least two said switching devices are arranged on different axes of the transmission. This further increases the flexibility of the transmission with regard to the representation of possible gears. At the same time a simple manufacture of the transmission is possible because only one switching device must be arranged on an axis of the transmission.

Advantageously, by means of one of said switching devices only transmission elements in the sense of loose wheels on the different waves can be connected. Thus, by means of said switching device different wheel planes can be particularly easily coupled with other waves, so that the flexibility of the transmission is increased.

Conveniently, the said switching devices are each arranged between two wheel planes. Thus, the space between the two respective wheel planes can be used efficiently.

Advantageously, at least one switching device, in particular comprising only one switching element, is arranged between the drive side and the first gear plane. Thus, for example, the area between a double clutch and the first wheel plane can also already be used to display gears by means of a shifting element.

Appropriately, the output takes place via the countershaft, in particular wherein input shafts and output shaft are arranged on the same side of the transmission. Thus, the transmission can be made even more compact, since drive and output are made on the same side of the transmission.

Advantageously, at least one reverse gear can be displayed by means of at least one wheel plane. This flexibility of the transmission is further increased in terms of use in various vehicles, as well as the vehicle can be operated with a reverse gear.

Conveniently, the reverse gear is completely decoupled from the force and torque flux. In this way, for example, co-rotation of transmission elements of the wheel plane of the reverse gear is avoided, so that overall the efficiency of the transmission is increased when transmitting power and torque.

Advantageously, at least four reverse gears can be represented by means of said wheel plane. In this way, a sufficient number of reverse gears is provided, so that the flexibility of the transmission with respect to the use in different vehicles is further increased.

Conveniently, at least one wheel plane by means of two different switching devices can be actuated. This also increases the flexibility of the transmission in the representation of different gears.

Advantageously, at least one space between two adjacent wheel planes is switch-free and / or at least one switching device is arranged between two adjacent wheel planes on different axes. If the space between two adjacent wheel planes is free of switching devices, they can be arranged extremely compactly next to one another in the gearbox. If at least one switching device is arranged between two adjacent wheel planes on different axes, the space between two wheel planes is utilized very efficiently, so that the gear can be made compact in axial extension.

Conveniently, the transmission elements are arranged in the transmission in the sense of fixed wheels of wheel planes on the input shaft axis farthest from the drive side. This allows easy production of the side of the transmission lying in the axial direction with respect to the drive side.

Advantageously, to represent the forward and / or reverse gears each an odd number of wheel planes in the force and torque flow from the drive side to the output side einbindbar. This allows many gears with only one wheel plane and thus also incorporate little switching elements, so that the efficiency of the transmission is improved.

Advantageously, the lowest two, in particular the lowest four forward gears are represented as Windungsgänge. This also allows a particularly compact design of the transmission.

Advantageously, a switching device is arranged in each case on input shaft axis and countershaft axis, which comprises only one switching element, in particular wherein the respective switching element for driving on the input shaft axis and the output on the countershaft axis next neighbor is arranged relative to other switching elements on the same axis. Thus, the input range of the transmission or the output range of the transmission is simplified in terms of the structure.

Advantageously, in a method according to claim 22, four reverse gears are represented by actuating the shift elements corresponding to the first four gears and additional actuation of a ninth shift element. In this way, a particularly simple representation or circuit of reverse gears through the transmission is possible.

Further important features and advantages of the invention will become apparent from the subclaims, from the drawings, and from associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments and embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components or elements.

In each case show in a schematic form

1 a transmission according to a first embodiment of the present invention;

2 a switching matrix for a transmission according to 1 ;

3 a transmission according to a second embodiment of the present invention and

4 a switching matrix for a transmission according to 3 ,

1 shows a transmission according to a first embodiment of the present invention.

In 1 denotes reference numeral 1 a transmission in the form of a dual-clutch transmission. The dual-clutch transmission 1 has two load switching elements in the form of clutches K1, K2. By means of the double clutch K1, K2 can thereby the drive side AN with the lying on the same side output side AB of the transmission 1 coupled or connected for the transmission of power and torque. For this purpose, first the clutch K1 is connected to a first input shaft EW1 and the second clutch K2 is connected to a second input shaft EW2. The first input shaft EW1 is formed as a solid shaft, whereas the second input shaft EW2 is formed as a hollow shaft. The two input shafts EW1, EW2 are arranged coaxially and parallel to each other.

Furthermore, the transmission includes 1 two partial transmissions 2 . 3 , The first partial transmission 2 is connected to the first input shaft EW1 and the second partial transmission 3 is connected to the second input shaft EW2. Likewise, the transmission includes 1 an input shaft axis 4 on which the two input shafts EW1, EW2 are arranged. Torque and force downstream of the drive side AN starting from the two clutches K1 and K2 on the input shaft axis 4 includes the gearbox 1 First, a first switching element S1 in a first switching device SE1, a first gear plane a, a second switching element S2 and a third switching element S3 arranged in a second switching device SE2, a second gear plane b, a third gear plane c, a fourth gear plane d and a fifth gear plane e.

The first partial transmission 2 are the fourth gear plane d and the fifth gear plane e assigned, whereas the second part gear 3 the first wheel plane a, the second wheel plane b and the third wheel plane c are assigned.

Each of said gear planes a, b, c, d, e has transmission elements, in particular in the form of gears, each with a shaft of the transmission 1 connected or connectable.

On the input shaft axis 4 Furthermore, a first hollow shaft H1 is arranged, which is arranged coaxially and parallel to the second input shaft EW2 designed as a hollow shaft on its radial outer side.

Parallel to the input shaft axis 4 is a countershaft axle 5 for a counterfeit 6 arranged. The counterpart 6 includes a first countershaft VW1 and the output shaft AW, which are each formed as solid shafts and a second countershaft VW2, which is designed as a hollow shaft. The second countershaft VW2 designed as a hollow shaft is arranged coaxially and parallel to the first countershaft VW1 in the region of the third gear plane c and the fourth gear plane d.

Starting from the drive side AN and on the same side lying output side AB, the gearbox 1 on the countershaft axis 5 First, the first gear plane A, a fourth switching element S4 arranged in a third switching device SE3, the second gear plane B, a fifth switching element S5 and a sixth switching element S6 arranged in a fourth switching device SE4, the third gear plane c and the fourth gear plane d, a seventh switching element S7 and an eighth switching element S8, arranged in a fifth switching device SE5 and the fifth gear plane e.

The eight switching elements S1, S2, S3, S4, S5, S6, S7 and S8 will now be described below.

The first switching element S1 is on the input shaft axis 4 arranged and connected on the one hand with the first hollow shaft H1, on the other hand with the second input shaft EW2 and, when actuated, establishes a connection for the transmission of forces and torques between these two shafts. On the first hollow shaft H1, a transmission element of the first gear plane a is fixed.

The second switching element S2 is on the input shaft axis 4 arranged and connected on the one hand with the first hollow shaft H1, on the other hand with a transmission element of the second gear plane b and, when actuated, establishes a connection between the first hollow shaft H1 and the second gear plane b. The transmission element of the second wheel plane b on the input shaft axis 4 is freely rotatably mounted on the second input shaft EW2.

The third switching element S3 is on the input shaft axis 4 arranged and on the one hand with the transmission element of the second gear plane b on the input shaft axis 4 connected and on the other hand with the second input shaft EW2 and provides upon actuation of a connection between the second input shaft EW2 and the second gear plane b ago.

The fourth switching element S4 is on the countershaft axis 5 arranged and connects when actuated the output shaft AW and the first countershaft VW1, which are both formed as solid shafts.

The fifth switching element S5 is on the countershaft axis 5 arranged and on the one hand with the first countershaft VW1, on the other hand with the transmission element of the third gear plane c on the countershaft axis 5 connected and establishes a connection between these two when actuated. The transmission element of the third gear plane c on the countershaft axis 5 is freely rotatably mounted on the second countershaft VW2.

The sixth switching element S6 is on the countershaft axis 5 arranged and on the one hand with the transmission element of the third gear plane c on the countershaft axis 5 connected, on the other hand, with the second countershaft VW2 and, when actuated, establishes a connection between the two.

The seventh switching element S7 is on the countershaft axis 5 arranged and connected on the one hand with the first countershaft VW1, on the other hand with the second countershaft VW2 and provides a connection between these two when actuated.

The eighth switching element S8 is on the countershaft axis 5 arranged and on the one hand with the first countershaft VW1, on the other hand with the transmission element of the fifth wheel plane e on the countershaft axis 5 connected and establishes a connection between these two when actuated.

The transmission element of the third gear plane c on the input shaft axis 4 is formed in the sense of a fixed wheel for the second input shaft EW2 and the transmission elements of the fourth gear plane d and the fifth gear plane e are formed in the sense of fixed wheels for the first input shaft EW1. The transmission element of the first gear plane a on the countershaft axis 5 is designed in the sense of a fixed wheel for the output shaft AW and the transmission element of the second wheel plane b on the countershaft axis 5 is designed in the sense of a fixed wheel for the first countershaft VW1. The transmission element of the fourth gear plane d on the countershaft axis 5 is designed in the sense of a fixed wheel for the second countershaft VW2 and the transmission element of the fifth wheel plane e in the sense of a loose wheel for the first countershaft VW1.

The sequence of waves on the countershaft axis 5 is starting from the drive side AN, which in 1 is shown as follows: output shaft AW, first countershaft VW1, and in a portion of the first countershaft VW1, ie in the region of the two wheel planes c, d, the countershaft VW2 coaxial and parallel to the first countershaft VW1.

The switching devices SE2, SE4 and SE5 can be designed as double synchronizers, the switching devices SE1 and SE3 as single synchronizers. If two switching elements are arranged together in a switching device, they can be actuated by means of a common switching element actuating device.

Overall, the gearbox has 1 according to 1 two input shafts EW1, EW2 on the input shaft axis 4 on, wherein the second input shaft EW2 is designed as a hollow shaft and the first input shaft EW1 as a solid shaft. On the input shaft axis 4 parallel countershaft axis 5 are arranged two countershaft axis VW1, VW2, wherein the first countershaft VW1 as a hollow shaft and the other countershaft VW2 coaxial and parallel to and arranged in a portion of this and is formed as a hollow shaft. Furthermore, the countershaft axis 5 the output shaft AW, which is designed as a solid shaft.

The gear 1 according to 1 includes five wheel planes a, b, c, d and e. The wheel planes a-e are designed in particular as standard wheel stages with discrete translations. Each gear plane a-e two transmission elements, in particular in the form of gears are arranged. Overall, thus ten transmission elements, in particular in the form of gears are arranged.

Overall, by the embodiment of the 1 at least nine forward gears are provided.

2 shows a switching matrix for a transmission according to 1 ,

In 2 is a switching matrix for a transmission 1 according to the 1 shown. Horizontal columns are shown in each case for a switching element S1-S8 and for the two clutches K1 and K2. Perpendicular to this down are the nine forward gear ratios, designated by the reference symbols V1-V9. Another column, labeled "Wheels", shows the wheel planes a-e involved for the respective forward gear V1-V9.

The left in the switching matrix entries, so for example at the forward gear stage V1 in the clutch K1 and the switching elements S1, S3, S4, S5, S7 indicate that the corresponding switching element or the clutch is opened, i. that the switching element or the clutch in this case no forces or no torque from the connected to the switching element or the clutch or transmits connected to this or this respective waves or transmission elements. An entry in the switching matrix provided with a dot denotes a correspondingly actuated or closed switching element or clutch, that is to say in the switching matrix at the forward gear stage V1, in the clutch K2 and the shifting elements S2, S6 and S8. In the "Wheels" column, the gear planes c, d, b, a are listed in the forward gear stage V1, ie that all wheel planes are used to represent the forward gear V1, on the other hand shown by the sequence of torque flow, that is initially only the second input shaft EW2, which is actuated via the clutch K2 and then the third gear plane c is acted upon and then further by pressing the sixth switching element S6, the fourth gear plane d and then continue the fifth gear plane e. Then, by pressing the eighth switching element S8, the first countershaft VW1 is then subjected to force and torque. In the course of the first countershaft VW1 then the second wheel plane b is acted upon by force and torque, which is connected by actuation of the second switching element S2 with the first gear plane a, which in turn is connected to the output shaft AW. In this way, the first forward gear V1 is shown.

Overall, by means of the switching matrix according to 2 at least nine forward gears V1-V9 by means of the transmission 1 according to 1 to provide.

3 shows a transmission according to a second embodiment of the present invention.

In 3 is essentially a transmission 1 according to 1 shown. In contrast to the transmission 1 according to 1 has the gearbox 1 according to 3 another wheel plane R, which is used to display at least one reverse gear. For this purpose, a ninth switching element S9 is arranged in the third switching device SE3, which is a transmission element of the reverse gear R to the first countershaft VW1 on the countershaft axis 5 coupled. The transmission element of the reverse gear R on the input shaft axis 4 is designed as a fixed gear on the hollow shaft H1. The sequence of switching elements and wheel planes on the input shaft axis 4 starting from the drive side is thus as follows: first shift element S1, first gear plane a, reverse gear R, second shift element S2, third shift element S3, second wheel plane b, etc. The sequence of shift elements and wheel planes on the countershaft axis 5 is then as follows: First wheel plane a, fourth shift element S4, ninth shift element S9, reverse gear R, second wheel plane b, etc ..

4 shows a switching matrix for a transmission according to 3 ,

In 4 is a corresponding switching matrix according to 2 shown, supplemented by four Reverse gears R1-R4. Furthermore, a column for the ninth switching element S9 has been inserted. The representation of the reverse gears R1-R4 is the same as in the forward gears V1-V4, wherein in the reverse gears R1-R4 additionally in each case the ninth switching element S9 is actuated. In the column of wheels, the reverse gear R is integrated instead of the second wheel plane b with otherwise the same sequence of wheel planes.

In summary, the invention has the advantage that the transmission is extremely compact, with at least nine gears with eight switching elements or nine switching elements can be realized with additional reverse gears. The four first gears V1-V4 are designed as Windungsgänge. Overall, the gearbox has five gear planes a-e and six gear planes a-e, R and builds compact.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in many ways.

LIST OF REFERENCE NUMBERS

1

transmission

2, 3

subtransmissions

4

Input shaft axis

5

Countershaft axis

6

countershaft

a, b, c, d, e

wheel plane

R

Gear plane reverse

AT

driving side

FROM

output side

EW1, EW2

input shaft

VW1, VW2

Countershaft

H1

hollow shaft

AW

output shaft

V1, V2, V3, V4, V5, V6, V7, V8, V9

forward gear

R1, R, R3, R4

reverse gear

S1, S2, S3, S4, S5, S6, S7, S8, S9

switching element

SE1, SE2, SE3, SE4, SE5

switching device

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102012220686 A1 [0007]

Claims (24)

Transmission ( 1 ), in particular dual-clutch transmission, for a motor vehicle, comprising at least two partial transmissions ( 2 . 3 ), each of the partial transmissions ( 2 . 3 ) comprises at least one input shaft (EW1, EW2) and wherein an output shaft as the output shaft (AW) of both partial transmissions ( 2 . 3 ) and wherein the at least two input shafts (EW1, EW2) are arranged on an input shaft axis ( 4 ) are arranged and the output shaft (AW) on the input shaft axis ( 4 ) or on one, in particular to the input shaft axis ( 4 ) parallel countershaft axis ( 5 ) or output shaft axis is arranged, and wherein a countershaft ( 6 ) is arranged with at least one countershaft (VW1, VW2), wherein the at least one countershaft (VW1, VW2) on said countershaft axis ( 5 ) and wherein at least one of the input shafts (EW1, EW2) is connected by means of at least one gear plane (a, b, c, d, e) and / or at least one switching element (S1, S2, S3, S4, S5, S6, S7, S8) is connectable to the output shaft (AW), characterized in that at most five wheel planes (a, b, c, d, e) and at most five switching devices (SE1, SE2, SE3, SE4, SE5) are arranged such that at least nine forward gears (V1, V2, V3, V4, V5, V6, V7, V8, V9) through the transmission ( 1 ) are representable. Transmission according to claim 1, characterized in that exactly five wheel planes (a, b, c, d, e) are arranged. Transmission according to one of claims 1-2, characterized in that the plurality of switching devices (SE2, SE4, SE5) each comprise two switching elements (S2, S3; S5, S6; S7, S8). Transmission according to any one of claims 1-3, characterized in that the plurality of the switching devices (SE3, SE4, SE5) and / or the plurality of the switching elements (S4, S5, S6, S7, S8) is disposed on the countershaft axis. Transmission according to one of claims 1-4, characterized in that all the switching devices (SE3, SE4, SE5) on the countershaft axis ( 5 ) each comprise two switching elements (S4, S9; S5, S6; S7, S8). Transmission according to one of claims 1-5, characterized in that at least one switching device (SE2, SE4) is formed so that by means of this a transmission element of a wheel plane (b; c) on an axis ( 4 ; 5 ) of the transmission ( 1 ) with different waves (H1, EW2, VW1, VW2) on the same axis ( 4 . 5 ) of the transmission ( 1 ) is connectable. Transmission according to claim 6, characterized in that at least two, in particular exactly two of said switching means (SE2, SE4) are arranged. Transmission according to claim 7, characterized in that the at least two said switching devices (SE2, SE4) on different axes ( 4 . 5 ) of the transmission ( 1 ) are arranged. Transmission according to one of claims 6-8, characterized in that by means of one of said switching devices (SE2) only transmission elements in the sense of loose wheels on the different shafts (EW2, H1) are connectable. Transmission according to one of claims 7-9, characterized in that said switching means (SE2, SE4) are each arranged between two wheel planes (a, b; b, c). Transmission according to one of claims 1-10, characterized in that between the drive side (AN) and the first gear plane (a) at least one switching device (SE1), in particular comprising only one switching element (S1), is arranged. Transmission according to one of claims 1-11, characterized in that the output via the countershaft ( 6 ), in particular wherein input shafts (EW1, EW2) and output shaft (AW) on the same side of the transmission ( 1 ) are arranged. Transmission according to one of claims 1-12, characterized in that by means of at least one gear plane (R) at least one reverse gear (R1, R2, R3, R4) can be displayed. Transmission according to one of claim 13, characterized in that the reverse gear (R) is completely decoupled from the force and torque flow. Transmission according to one of claims 13-14, characterized in that at least 4 reverse gears (R1, R2, R3, R4) by means of said wheel plane (R) can be displayed. Transmission according to one of claims 1-15, characterized in that at least one wheel plane (a) by means of two different switching devices (SE1, SE2) can be actuated. Transmission according to one of claims 1-16, characterized in that at least one space between two adjacent wheel planes (c, d) is schalteinrichtungsfrei and / or at least one switching device (SE2, SE3) between two adjacent wheel planes (a, b) on different Axes ( 4 . 5 ) is arranged. Transmission according to one of claims 1-17, characterized in that the transmission elements in the sense of fixed wheels of wheel planes (c, d, e) on the input shaft axis ( 4 ) furthest from the drive side (AN) in the transmission ( 1 ) are arranged. Transmission according to one of claims 1-18, characterized in that for displaying the forward (V1, V2, V3, V4, V5, V6, V7, V8, V9) and / or reverse gears (R1, R2, R3, R4) in each case an odd number of wheel planes (a, b, c, d, e, R) in the force and torque flow from the drive side (AN) to the output side (AB) are einbindbar. Transmission according to one of claims 1-19, characterized in that the lowest two, in particular the lowest four forward gears (V1, V2, V3, V4) are represented as Windungsgänge. Transmission according to one of claims 1-20, characterized in that in each case on input shaft axis ( 4 ) and countershaft axis ( 5 A switching device (SE1; SE3) is arranged which comprises only one switching element (S1; S4), in particular wherein the respective switching element (S1; S4) is intended for driving on the input shaft axis (S1; 4 ) and to the output on the countershaft axis ( 5 ) next to the other switching elements (S2, S3, S5, S6) on the same axis ( 4 . 5 ) is arranged. Method for operating a transmission ( 1 ) according to one of claims 1-21, characterized in that a first gear (V1) by means of actuated second, sixth and eighth switching element (S2, S6, S8) is shown and that a second gear (V2) by means of actuated second and eighth switching element (S2, S8), and that a third speed (V3) is represented by the second and fifth shift elements (S2, S5) being actuated and a fourth speed (V4) is represented by the second and seventh shift elements (S2, S7) being actuated in that a fifth gear (V5) is represented by means of the actuated first shifting element (S1), and that a sixth gear (V6) is represented by actuated fourth and eighth shifting elements (S4, S8), and that a seventh gear (V7) is represented by operated fourth and fifth switching element (S4, S5) is shown, and that an eighth gear (V8) by means of actuated fourth and seventh switching element (S4, S7) is shown, and that a ninth gear (V9) by means of actuated third and fourth switching element (S3, S4) is shown, in each case the other switching elements are open or are in neutral position and wherein a first clutch (K1) in the even gears (V2, V4, V6, V8) is closed and a second Clutch (K2) is closed in the odd gears (V1, V3, V5, V7, V9) and the other clutch (K2, K1) is open. A method according to claim 22, characterized in that four reverse speeds (R1, R2, R3, R4) are represented by operating the switching elements corresponding to the first four speeds (V1, V2, V3, V4) and actuating a ninth switching element (S9). Motor vehicle, in particular a passenger or a truck, with a transmission ( 1 ) according to any one of claims 1 to 21 and / or operated by a method according to any one of claims 22-23.

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