DE102012201680A1 - Transmission e.g. dual clutch transmission for motor car, has switching arrangements that are arranged on major axis, and countershaft is connected with gear planes using switching arrangement arranged on minor axis - Google Patents

Abstract

The transmission (1) has partial transmissions that are provided with input shaft (EW1,EW2) on main axis (2) and driven shaft (AW) on minor axis (3). A reduction gear (4) is provided with countershaft (VW1,VW2) that is arranged on minor axis. One of the input shafts is connected with driven shaft using shift elements (S1-S8) in the gear planes (I-VI). The switching arrangements (SE1-SE3) are arranged on major axis. The countershaft is connected with gear planes (III-VI) using switching arrangement (SE4) arranged on minor axis. The gear plane (VI) is designed as reverse gear stage.

Description

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, wherein the at least one input shaft on a main axis and the output shaft the at least one countershaft is arranged on the minor axis and wherein at least one of the input shafts by means of at least two gear planes and / or at least one of the input shafts is arranged on the minor axis or on a, in particular to the main axis parallel minor axis, and wherein a countershaft is arranged with at least one countershaft Switching element is connectable to the output shaft.

Such transmissions for a motor vehicle are designed, inter alia, as so-called. Dual-clutch transmission, in which the input shafts of the two partial transmissions can be connected via a respective load switching element to a drive, such as an internal combustion engine or an electric motor, wherein the two load switching elements combined in the form of a double clutch become. 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 radial direction.

From the DE 10 2006 054 281 A1 Such a transmission for a motor vehicle in the form of a dual-clutch transmission has become known. The dual-clutch transmission comprises two partial transmissions, each with an input shaft. By connecting the respective input shaft via a respective load switching element, the two partial transmissions can each be alternately incorporated into a force or torque flow from a drive to an output, wherein the input shaft of the first subtransmission is designed as Getriebzentral- and the input shaft of the second subtransmission as a hollow shaft transmission. Furthermore, an output shaft is arranged, which is designed as an output of both partial transmissions, wherein a rotational movement of the drive can be translated over several translation stages to the output, in which the force and torque flow is guided via a countershaft. In this case, at least two wheel planes are switched by means of actuation of associated switching elements in the force and torque flux, wherein a plurality of gear ratios can be represented by combining the actuation of the switching elements and the force and torque flow over corresponding wheel plane. Likewise, an untranslated transmission of the rotational movement of the drive to an output shaft of the output by operating corresponding switching elements is possible.

An object of the present invention is therefore to provide a transmission for a motor vehicle, which enables a flexible power division, as well as an improved load switching capability and an improved hybridization capability. Moreover, it is an object of the present invention to provide a transmission for a motor vehicle, which is simple and inexpensive to produce and at the same time allows reliable transmission of torque between the drive and output. Moreover, it is an object of the present invention to provide an alternative transmission for a motor vehicle.

The present invention solves the problems in a transmission, in particular dual-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 an output shaft of both partial transmissions, wherein the at least one input shaft on a main axis and the Output shaft is arranged on the main axis or on a, in particular to the main axis parallel minor axis, and wherein a countershaft with at least one Countershaft is arranged, wherein the at least one countershaft is arranged on the minor axis and wherein at least one of the input shafts by means of at least two gear planes and / or at least one switching element with the output shaft is connectable, characterized in that switching means of the number M are arranged, where M is a positive is greater than or equal to 2, and that M - 1 switching devices are arranged on the main axis and a switching device on the minor axis and that at least one of the countershafts with at least three, in particular four wheel planes is connectable by means of the switching device on the minor axis.

The invention solves the tasks also in a motor vehicle, in particular a passenger or truck with a transmission according to one of claims 1 to 13.

One of the advantages achieved with this is that a vast majority of switching elements and switching devices are arranged on the main axis, which acts as the central axis of the transmission. This allows a comfortable and flexible power sharing by means of the Vorgeleges. Likewise, larger torques can be transmitted from the drive to the output side in this way. In addition, a reduction of a mechanical spread by winding the first forward gear of the transmission is possible in this way. Finally, the transmission also offers improved load shifting capability and good hybridization capability, since an electric machine can be coupled to the transmission in a particularly simple manner.

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 the switching element cooperating devices.

The term "switching device" is preferably to be understood in the description, in particular in the claims, at least one switching element and at least one switching element actuation device for actuating the at least one switching element.

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

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

Expediently, at least two of the input shafts are arranged coaxially and / or at least one second countershaft is arranged coaxially with the first countershaft. This reduces the space for the two input shafts and thus also the corresponding transmission, so that the transmission can also be used in cramped conditions in a motor vehicle. Another advantage is that even two countershafts can be arranged to save space to each other. Likewise, this allows additional countershafts to be provided, so that a multiplicity of gears or gear steps can be represented by means of the transmission.

Advantageously, at least one of the input shafts and / or at least one of the countershafts is formed as a hollow shaft and the respective other shaft as a solid shaft. Two or more input shafts and / or countershafts can thus be arranged in a particularly space-saving manner in the transmission, so that the transmission as a whole requires an extremely small installation space. Thus, the transmission can be installed in a wide variety of vehicles even in extremely tight spaces. A complex and expensive adaptation of the transmission for a particular vehicle type can be dispensed with.

Conveniently, at least three gear planes are connectable by means of at least one switching element with at least one of the input shafts, wherein in particular the at least one switching element is arranged on the main axis. In this way, by means of a plurality of wheel planes, a torque can be reliably transmitted from the first input shaft to one of the countershafts. In addition, thereby a variety of gears or gear ratios can be provided, so that the flexibility in terms of the use of the transmission in various vehicles is further increased.

Advantageously, at least one wheel plane is designed as a reverse gear. By means of the at least one reverse gear stage, the direction of rotation of the output shaft can be reversed, so that at least one reverse gear for a vehicle can be provided, which further improves the flexibility with regard to the use in different vehicles.

Conveniently, the reverse gear can be actuated by means of the switching device on the minor axis. One of the advantages achieved with this is that it reduces the number of switching devices on the main axis, so that the transmission as a whole can be made more compact in the axial direction. The extension of the transmission along the main and minor axis is thereby shortened.

Advantageously, the reverse gear can be connected to one of the countershafts and the output shaft by means of the switching element on the minor axis. In this way, the reverse gear is disposed substantially in the region of the output, which allows a simpler arrangement or accessibility of the reverse gear in the manufacture of the transmission.

Conveniently, an electric machine is arranged on at least one gear plane and / or on at least one countershaft and / or on at least one of the input shafts. In this way, the transmission can also be used in hybrid vehicles, in which both an electric machine and an internal combustion engine with the transmission for the transmission of forces to drive the hybrid vehicle to interact. The connection of the at least one electric machine can take place on at least one of the input or output shafts and / or on at least one of the countershafts. The electric machine can also be connected to a transmission element in the form of a fixed wheel or idler gear of one of the wheel planes.

It is also possible to connect or couple the electric machine to an additional fixed gear, that is to say to a wheel which is fixedly connected to one of the shafts of the gearbox. It is particularly advantageous to make the connection or coupling of the electric machine to the transmission by means of at least one switching element, in particular to a transmission element of a wheel plane. The advantage achieved with this first connection possibility is that so that a so-called stand-charge capability and an electric driving without drag losses in the transmission is possible. For this purpose, the disclosure content of DE 10 2010 030 569 A1 explicitly referred to by reference: In this case, a first input shaft with a load switching element can be coupled. A second input shaft, which is arranged in particular coaxially to the first input shaft, is directly connected to a rotor of the electric machine for driving it. As a result, two parallel power transmission branches can be coupled to one another on the input side.

A second connection possibility of the electric machine to the transmission is possible by arranging a planetary gear in the transmission: To a first input shaft can be coupled via a corresponding switching element, in particular in the form of a clutch, an internal combustion engine. The electric machine engages on the one hand on a second input shaft and on the first input shaft of the transmission via a planetary gear. When actuated, so closed disconnect clutch of the engine is also coupled via the planetary gear to the second input shaft. The planetary gear, comprising a planet gear, a ring gear, planetary gears and a planet carrier, is designed in this way, and cooperates with the internal combustion engine and the electric machine, so that the planet carrier acts on the second input shaft. The electric machine is coupled to the sun gear of the planetary gear. In addition, a further switching element may be arranged in the form of a bridging switching element, which cooperates with the planetary gear, so that when actuated lock-up switching element a rotationally fixed connection between the electric machine, the first input shaft and the second input shaft, whereas not actuated, so open, Bridging switching element, the aforementioned non-rotatable connection between the electric machine and the first and second input shaft does not exist, in particular so there is no speed equality between the two input shafts.

If a further switching element is arranged between the switching element, which serves to connect the internal combustion engine to the first input shaft, and bridging switching element, by means of this further switching element, in particular in the form of a double switching element, both the abovementioned first connection possibility and the aforementioned second connection possibility by actuation of the other Switching element possible.

Advantageously, the electric machine is arranged on at least one of the wheel planes, which are connected to a countershaft, designed as a solid shaft. One of the advantages achieved with this is that thus a simple connection of the electric machine to the transmission and thus a reliable power and torque transmission is finally made possible by the electric machine to the output shaft.

Conveniently, at least one wheel plane can be coupled to at least two input shafts. In this way, by means of one and the same wheel plane both a torque transmission from the first input shaft and the second input shaft to one of the countershafts possible, which improves the reliability of the transmission with respect to a torque transmission from one of the input shafts to the countershaft.

Advantageously, one of the countershafts is formed as a solid shaft and connectable by means of a switching element with the output shaft. On the one hand thereby the countershaft is simple and inexpensive to produce, on the other hand can thus be made a very reliable connection between a countershaft and the output shaft.

Conveniently, transmission elements on the minor axis of at least three gear planes with a countershaft designed as a hollow shaft are fixedly connected and these gear planes are in particular by means of a switching element with the countershaft, designed as a solid shaft, connectable. This ensures, on the one hand, an extremely reliable transmission of force and torque through the transmission elements to and from the countershaft designed as a hollow shaft, and on the other hand, cost-effective production is also possible since the countershaft and transmission element can be manufactured together in one piece. Costs associated with the separate production of hollow shaft and transmission element as well as the time required to transmit the transmission element and the hollow shaft, can be omitted. Another advantage is, inter alia, that in particular by means of the switching element then a connection between the first countershaft as a hollow shaft and the countershaft designed as a hollow shaft is made possible, which makes further courses or gear ratios represented by the transmission.

Advantageously, the M switching devices and the at least two wheel planes are arranged so that at least six forward gears and at least two reverse gears are represented by the transmission. This can be provided for a variety of vehicles a sufficient number of forward gear ratios and reverse gear stages, in particular for both passenger cars and for trucks.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated description of the figures 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 transmission according to a second embodiment of the present invention;

3 a transmission according to a third embodiment of the present invention; such as

4 a shift matrix for a transmission according to the first embodiment according to 1 ,

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 has two power shift elements in the form of clutches K1, K2. By means of the double clutch K1, K2, the drive side AN can be coupled with the output side AB for the transmission of torques. For this purpose, the first clutch K1 is connected to a first input shaft EW1 and the second clutch K2 is connected to a second input shaft EW2. The second input shaft EW2 is designed as a hollow shaft, whereas the first input shaft EW1 is formed as a solid shaft. The two input shafts EW1, EW2 are arranged coaxially with each other. Furthermore, the transmission includes 1 a major axis 2 which, starting from the two clutches K1, K2, initially has a first wheel plane I, a first shift element S1, a second shift element S2, and a second wheel plane II, downstream of the drive AN, and further comprises a third shift element S3, a fourth shift element S4, a third gear plane III, a fourth gear plane IV, a fifth shift element S5, a sixth shift element S6, a fifth gear plane V and a sixth gear plane VI, which is in the form of a reverse gear. Each of the said wheel planes I, II, III, IV, V and VI has transmission elements, each with a shaft of the transmission 1 are connected. The wheel planes V and VI are connected to an output shaft AW of the output AB.

Parallel to the main axis 2 is a minor axis 3 for a counterfeit 4 arranged. The counterpart 4 in this case comprises a countershaft VW1, which is designed as a solid shaft, and a plurality thereof coaxially arranged in two portions of the first countershaft VW1 and designed as a hollow shaft countershaft VW2, VW3. On the countershaft VW1 transmission elements for the wheel planes I and II are arranged for the transmission of torques. The second countershaft VW2 comprises transmission elements for the wheel planes III, IV, V, the third countershaft VW3 transmission elements for the wheel plane VI. Between the transmission element of the wheel plane V and the transmission element of the wheel plane VI, a seventh switching element S7 and an eighth switching element S8 are combined to form a fourth switching device SE4. Furthermore, the wheel plane VI in the form of the reverse gear between the minor axis 3 and the main axis 2 between the respective transmission elements on minor and major axis 3 . 2 an intermediate ZR for reversing the direction of rotation, so that by means of the output shaft AW in the same direction of rotation of the input shafts EW1, EW2 a reverse direction of rotation is provided to provide at least one reverse gear.

The switching element S1, when actuated, transmits torques from the second input shaft EW2 and a first hollow shaft H1a, which is arranged coaxially to the outside of the second input shaft EW2. On the first hollow shaft H1a is a transmission element for transmitting torques from the main axis 2 on the minor axis 3 arranged. This transmission element together with a correspondingly formed transmission element on the minor axis 3 forms as stated above, the first gear plane I. The second switching element S2 establishes a connection between the second input shaft EW2 and a second hollow shaft H12. On the second hollow shaft H12 also a transmission element is arranged, which cooperates with a transmission element on the first countershaft VW1 for transmitting forces and torques between the two shafts EW2 and VW1. The two transmission elements form the second wheel plane II. The two switching elements S1, S2 are further combined to form a common first switching device SE1 and actuated by a common Schalteinrichtungsbetätigungselements SB1, that can be brought into an open or a closed state. The second hollow shaft H12 is further connected to the third switching element S3 and arranged coaxially with the second input shaft EW2. The third switching element S3 is further connected to the first input shaft EW1 and allows when actuated transmission of forces and torques from the first input shaft EW1 to the second hollow shaft H12. The transmission element arranged on the second hollow shaft H12 acts - as already stated above - with the corresponding transmission element on the first countershaft VW1 for transmitting torques from the main axis 2 on the minor axis 3 together.

The fourth switching element S4 is connected to a third hollow shaft H2b arranged coaxially with the first input shaft EW1. When actuated, the fourth shifting element S4 makes it possible to transmit forces and torques from the first input shaft EW1 to the third hollow shaft H2b. On the outside of the third hollow shaft H2b, a transmission element is arranged, which with a transmission element of a second countershaft VW2 arranged on the minor axis 3 cooperates for the transmission of forces and torques. The input shaft EW1 is further connected to a fifth switching element S5. Upon actuation of the fifth switching element S5, the fifth switching element S5 establishes a connection between the first input shaft EW1 and a fourth hollow shaft H3 arranged coaxially to the first input shaft EW1. On the outside of the fourth hollow shaft H3, a transmission element is arranged, which cooperates with a transmission element on the second countershaft VW2 to form the fourth gear plane IV. The sixth switching element S6 is connected to the output shaft AW and, when actuated, establishes a connection between the first input shaft EW1 and the output shaft AW arranged coaxially with the first input shaft EW1. On the output shaft AW a transmission element is arranged, which cooperates with a transmission element on the second countershaft VW2 to form the fifth gear plane V. The seventh switching element S7 is on the minor axis 3 arranged and connected to the second countershaft VW2. Upon actuation of the seventh switching element S7, the seventh switching element S7 establishes a connection for the transmission of forces and torques between the first countershaft VW1 and the second countershaft VW2. The eighth switching element S8 is also connected to the first countershaft VW1 and further arranged with a third countershaft VW3, designed as a hollow shaft, and coaxial with the first countershaft VW1. On the outside of the third countershaft VW3, a transmission element is arranged, which interacts via an intermediate ZR with a transmission element on the output shaft AW. This transmission element on the third countershaft VW3, the intermediate gear ZR and the corresponding transmission element on the Output shaft AW thereby form the sixth gear plane VI in the form of a reverse gear.

Overall, the third switching element S3 and the fourth switching element S4 are combined in a second switching device SE2, which can be actuated by means of a common second switching element actuation device SB2. The same applies accordingly to the fifth switching element S5 and the sixth switching element S6, which are combined to form a third switching device SE3. The two switching elements S5, S6 can be actuated by means of a common switching element actuating device SB3. The fourth switching device SE4 accordingly comprises the seventh and eighth switching elements S7, S8, which can be actuated by means of a fourth common switching element actuating device SB4. The four switching element actuators SB1, SB2, SB3, SB4 can be designed as double synchronizers.

The transmission elements can be arranged both fixed and loose with the respective shaft, in particular with the input shafts EW1, EW2 and / or at least one of the countershafts VW1, VW2, VW3. The transmission elements may be designed in particular in the form of gears, preferably spur gears, so that the wheel planes I, II, III, IV, V and VI represent spur gears. To provide various forward and reverse gears, that is, various ratios, the spur gears, in particular their gears, may accordingly comprise different ratios to provide different forward and / or reverse gears.

Overall, the gearbox has 1 according to 1 two input shafts EW1, EW2, formed as full and hollow shaft on the main axis 2 , On the to the main axis 2 parallel minor axis 3 are arranged three countershafts VW1, VW2, VW3. The first countershaft VW1 is designed as a solid shaft and the two other shafts VW2, VW3 are arranged coaxially to this and designed as a hollow shaft. Furthermore, the output shaft AW is formed as a solid shaft and coaxial with the main axis 2 arranged. The gear 1 according to 1 includes six wheel planes I to VI, wherein the wheel plane VI is formed as a reverse gear. All wheel planes I to VI are designed in particular as spur gears with discrete ratios. Two gear elements, in particular in the form of gears, are arranged per gear plane I to V. The reverse gear step VI in this case comprises an additional gear in the form of an intermediate gear ZR between the two transmission elements on the main and minor axes 2 . 3 as stated above. Overall, therefore 13 Transmission elements, in particular in the form of gears in the transmission according to 1 arranged.

The wheel planes I, II, III and IV can be coupled to at least one of the input shafts EW1, EW2 by means of the switching elements S1, S2, S3, S4. The fifth gear plane V can be coupled by means of the sixth switching element S6 to the first input shaft EW1 and coupled by means of the seventh switching element S7 to the first countershaft VW1. The output shaft AW can be coupled to the first input shaft EW1 by means of the sixth switching element S6. The reverse gear VI is coupled by means of the eighth switching element S8 to the first countershaft VW1. The transmission elements of the wheel planes III, IV and V on the second countershaft VW2 are fixedly connected to the second countershaft VW2, which is coaxial with the solid shaft formed as a first countershaft VW1 and is formed as a hollow shaft, and by means of the seventh switching element S7 with the first countershaft VW1 can be connected or coupled as a solid shaft.

Overall, through the transmission 1 in the embodiment of the 1 at least six forward gears and at least two reverse gears are provided.

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

In 2 is essentially a transmission 1 according to 1 shown. In contrast to 1 has the gearbox 1 according to 2 in terms of their position along the major and minor axes 2 . 3 exchanged wheel planes III and IV. Unlike the gearbox 1 according to 1 in which a section of the sequence along the main axis 2 the gear planes are as follows: third shift element S3, fourth shift element S4, third wheel plane III, fourth gear plane IV, fifth shift element S5, sixth shift element S6, is in the transmission 1 according to 2 the sequence as follows: third switching element S3, fifth switching element S5, fourth gear plane IV, third gear plane III, fourth switching element S4, sixth switching element S6. The same applies accordingly to the elements of the wheel planes III and IV on the minor axis 3 , The second switching device SE2 now comprises the third and fifth switching element S3 and S5, which can be actuated via the common switching device actuating element SB2. The third switching device SE3 comprises according to 2 now the fourth and sixth switching element S4, S6, wherein the two switching elements S4, S6 are actuated via the common switching device actuating element SB3.

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

In 3 is a transmission 1 according to 1 shown. Unlike the gearbox 1 according to 1 includes the gearbox 1 according to 3 an electric machine EM. The electric machine EM is connected via a transmission element with the transmission element of the first gear plane I, which is arranged on the first countershaft VW1, for hybridizing the transmission 1 connected. The connection of the electric machine EM to the gearbox 1 can also be done on the transmission element, arranged on the first countershaft VW1, the second wheel plane II.

Overall, the switching elements S1 to S8 (M = 4) in the transmission 1 according to the 1 to 3 Also referred to as coupling devices, and be designed in particular as synchronizers. By different positioning of the wheel planes I to VI along the main and / or minor axis 2 . 3 and / or the switching elements or coupling devices S1 to S8, the respective transmission can be converted functionally same. For this purpose, shifting elements are assigned wheel planes or shafts of the transmission. Switching matrices for the transmission variants thus do not change due to a rearrangement of wheel planes and / or switching elements. Accordingly, the first switching element of the first gear plane I, the second switching element S2 of the second gear plane II, the third switching element S3 of the second gear plane II, the fourth switching element S4 of the third gear plane III, the fifth switching element S5 of the fourth gear plane IV, the sixth switching element S6 the input shafts EW1, EW2 and the output shaft AW, the seventh switching element S7 the wheel planes III, IV and V and the eighth switching element S8 of the sixth wheel plane VI, designed as a reverse gear, are assigned.

4 FIG. 12 shows a shift matrix for a transmission according to the first embodiment according to FIG 1 ,

In 4 is a switching matrix for a transmission 1 according to the 1 shown. Horizontal each case one column for each clutch K1, K2 and one switching element S1 to S8 are shown. Vertically down to this are initially the six forward gear stages, indicated by the numbers 1 to 6 shown and the three reverse gears designated R1, R2 and R3. The entries released in the matrix, so for example in the forward gear 1 in the switching elements S2, S4, S6, S7 and S8 and the clutch K1, indicate that the corresponding clutch K1 or the corresponding switching element S2, S4, S6, S7, S8 is open, ie the switching element transmits no force or no torque from the respective shafts connected to the switching element. If an entry in the switching matrix is provided with a cross, this designates a switching element closed for this gear.

To the first gear by means of the transmission 1 represent, the clutch K1 is open and the clutch K2 is closed and the switching elements S2, S4, S6, S7, S8 open and the switching elements S3 and S5 closed. To represent the second gear, the clutch K1 is closed and the clutch K2 is opened and the switching elements S1, S2, S3, S4, S6, S7, S8 are open and the switching element S5 closed. To illustrate the third gear, the first clutch K1 is opened and the second clutch K2 is closed and the shift elements S2, S3, S4, S5, S6, S8 opened and the switching elements S1 and S7 closed. To represent the fourth gear, the clutch K1 is closed and the clutch K2 is opened and the switching elements S1, S2, S3, S5, S6, S7, S8 opened and the switching element S4 closed. To illustrate the fifth gear, the clutch K1 is opened and the clutch K2 is closed and the switching elements S1, S3, S4, S5, S6, S8 are opened and the switching elements S2 and S7 are closed. To represent the sixth gear, the clutch K1 is closed and the clutch K2 is opened and the switching elements S1, S2, S3, S4, S5, S7, S8 opened and the switching element S6 closed. In order to represent the first reverse gear R1, the clutch K1 is opened and the clutch K2 is closed and the shifting elements S2, S3, S4, S5, S6, S7 are opened and the shifting elements S1 and S8 are closed. To represent the second reverse gear R2, the clutch K1 is open and the clutch K2 is closed and the switching elements S1, S3, S4, S5, S6, S7 open and the switching elements S2, S8 closed. In order to represent the reverse gear R3, the clutch K1 is closed and the clutch K2 is opened and the shifting elements S1, S32, S4, S5, S6, S7 are opened and the shifting elements S3, and S8 are closed. The reverse gear R3 has the same transmission or reduction as the reverse gear R2. In this way, by means of the transmission 1 according to 1 six forward gears and three reverse gears representable.

In summary, the present invention has the advantage that the mechanical spread can be reduced by winding the first gear. In addition, the invention provides the advantage of six wheel planes and at least eight coupling devices to provide at least six forward and two reverse gear stages available. Another advantage is that only four actuators in the form of switching devices for actuating the eight switching elements must be provided. Finally, further advantages of the transmission of the present invention are that the transmission has good load shifting capability and good hybridisability.

Although the present invention above based on preferred embodiments it is not limited thereto, but modifiable in many ways.

LIST OF REFERENCE NUMBERS

1

transmission

2

main axis

3

minor axis

4

countershaft

I, II, III, IV, V, VI, VII

wheel plane

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

switching element

SE1, SE2, SE3, SE4

switching device

EW1, EW2

input shaft

VW1, VW2, VW3a, VW3b

Countershaft

H1a, H1b, H12, H3

hollow shaft

FROM

output

AT

drive

AW

output shaft

ZR

idler

EM

electric machine

SB1, SB2, SB3, SB4

Switching element actuator

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 102006054281 A1 [0005]
• DE 102010030569 A1 [0022]

Claims (14)

Transmission ( 1 ), in particular dual-clutch transmission, for a motor vehicle, comprising at least two partial transmissions, wherein each of the partial transmissions comprises at least one input shaft (EW1, EW2), and wherein an output shaft is arranged as the output shaft (AW) of both partial transmissions, wherein the at least one input shaft (EW1, EW2) on a main axis ( 2 ) and the output shaft (AW) on the main axis ( 2 ) or on one, in particular to the main axis ( 2 ) parallel, minor axis ( 3 ), and wherein a countershaft ( 4 ) is arranged with at least one countershaft (VW1, VW2), wherein the at least one countershaft (VW1, VW2) on the minor axis ( 3 ), and wherein at least one of the input shafts (EW1, EW2) by means of at least two wheel planes (I, II, III, IV, V, VI) 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 switching means (SE1, SE2, SE3, SE4) of the number M are arranged, where M is a positive integer greater than or equal to two, and M - 1 Switching devices (SE1, SE2, SE3) on the main axis ( 2 ) and a switching device (SE4) on the minor axis ( 3 ) are arranged and that by means of the switching device (SE4) on the minor axis ( 3 ) at least one of the countershafts (VW1, VW2) with at least three, in particular four, wheel planes (III, IV, V, VI) is connectable. Transmission according to claim 1, characterized in that at least two of the input shafts (EW1, EW2) coaxially and / or at least one second countershaft (VW2) are arranged coaxially with the first countershaft (VW1). Transmission according to one of claims 1-2, characterized in that the at least one of the input shafts (EW1, EW2) and / or at least one of the countershafts (VW1, VW2) as a hollow shaft and the respective other shaft (EW2, EW1, VW2, VW1 ) is designed as a solid shaft. Transmission according to one of claims 1-3, characterized in that at least three wheel planes (I, III, IV) by means of at least one switching element (S1, S2, S3, S4, S5) with at least one of the input shafts (EW1, EW2) are connectable , wherein in particular the at least one switching element on the main axis ( 2 ) is arranged. Transmission according to one of claims 1-4, characterized in that at least one wheel plane (VI) is designed as a reverse gear. Transmission according to claim 5, characterized in that the reverse gear (VI) by means of the switching device (SE4) on the minor axis ( 3 ) is operable. Transmission according to one of claims 5-6, characterized in that by means of the switching element (S8) on the minor axis ( 3 ) the reverse gear (VI) with one of the countershafts (VW1, VW2) and the output shaft (AW) is connectable. Transmission according to one of claims 1-7, characterized in that an electric machine (EM) on at least one wheel plane (I, II, III, IV, V, VI) and / or on at least one countershaft (VW1, VW2) and / or at least at one of the input shafts (EW1, EW2) is arranged. Transmission according to claim 8, characterized in that the electric machine (EM) at least one of the wheel planes (I, II) is arranged, which are connected to a countershaft, designed as a solid shaft. Transmission according to one of claims 1-9, characterized in that at least one gear plane (II) can be coupled to at least two input shafts (EW1, EW2). Transmission according to one of claims 1-10, characterized in that one of the countershafts (VW1) is designed as a solid shaft and by means of a switching element (S8) with the output shaft (AW) is connectable. Transmission according to one of claims 1-11, characterized in that transmission elements on the minor axis ( 3 ) at least three wheel planes (III, IV, V) with a countershaft (VW2) designed as a hollow shaft and that these wheel planes (III, IV, V) in particular by means of a switching element (S7) with the countershaft (VW1), designed as Solid shaft, are connectable. Transmission according to one of claims 1-12, characterized in that the M switching means (SE1, SE2, SE3, SE4) and the at least two wheel planes (I, II, III, IV, V, VI) are arranged so that at least six Forward gears and at least two reverse gears through the transmission ( 1 ) are representable. Motor vehicle, in particular a passenger or a truck, with a transmission according to one of claims 1-13.

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