DE102008023146A1 - Double clutch - Google Patents

Abstract

The invention relates to a dual-clutch transmission. To increase the load capacity of the dual-clutch transmission is a dual-clutch transmission with at least four gear levels (E1, E2, Z1, Z2, Z3, Z4, Z5), of which at least two as input constants (E1, E2, Z1) and at least two as translation stages (Z1, Z2, Z3, Z4, Z5) are provided, with at least two coaxially arranged input shafts (10, 11), and with at least one input-side main bearing plane (12), an output-side main bearing plane (13) and a central main bearing plane (14), and an output shaft (26), which is mounted in at least a first bearing device (18) and a second bearing device (19), which are arranged in two of the main bearing planes (13, 14) in a transmission housing (29), wherein the inner input shaft (10) by means of a third bearing device (16) relative to the output shaft (26) is mounted, proposed.

Description

The The invention relates to a dual-clutch transmission according to the preamble of claim 1.

It are already dual-clutch transmission with three gear levels, from where two are provided as input constants and one as translation stage are, with two coaxially arranged input shafts, as well as with a input-side main bearing level, an output-side main bearing level and a central main storage level, known.

Of the Invention is in particular the object of a capacity to increase the dual clutch transmission. It is according to the invention solved by the features of claim 1. Further training emerge from the dependent claims.

The inventive solution of Task has a dual-clutch transmission with at least four gear levels, of which at least two as input constants and at least two as translation stages are provided, with at least two coaxially arranged input shafts, and with at least one input-side main bearing plane, a output-side main bearing level and a central main bearing level, as well as an output shaft that over at least one first storage device and a second storage device, which are arranged in two of the main bearing levels, stored in a transmission housing is, wherein the inner input shaft by means of a third bearing device across from the output shaft is mounted.

Thereby the first storage level can be stored very stable, and it can be dispensed with a floating bearing of the inner input shaft and the load capacity of the dual-clutch transmission increases. Under a "main storage level" should thereby In particular, a storage level to be understood that at least one Element that is responsible for a Connection of a storage device to a stationary storage element, such as a transmission housing, is provided. Under a "storage level" should be one perpendicular to a longitudinal direction extending level to be understood, the at least one bearing element having. Under a "in a storage level arranged storage device "is a storage device be understood, at least to the appropriate storage level borders. In particular, "provided" is intended specially equipped and / or designed to be understood.

Preferably is the first input shaft designed as an inner shaft, the the second designed as a hollow shaft Penetrated input shaft. This allows a compact design for the dual-clutch transmission be achieved at a high load capacity.

advantageously, the third bearing device is provided to the inner input shaft store for which the inner input shaft is particularly easy stable storage can be achieved. In a particularly advantageous manner, the storage device for supporting the inner input shaft within the output shaft arranged.

In addition, will suggested that the central main bearing plane as a bearing wall is trained. This can be a particularly simple and stable Main storage level can be realized.

Further It is suggested that a number of gear levels beforehand the central main bearing level are arranged, and a number of gear levels, which are arranged behind the central main bearing level to a maximum one differ from each other. This allows a countershaft - in relation on her longitudinal direction - near her Be stored in the middle, allowing a deflection of the countershaft is minimized effectively under load.

Further becomes an output shaft coaxial with the input shafts proposed, as a result of a particularly simple storage concept for the Dual clutch transmission in an advantageous embodiment of transmission gears can be found, and further realized a so-called direct gear can be, in which an input shaft to the output shaft directly or indirectly, and thus both waves rotate at the same speed.

In Another embodiment proposes that the first Bearing device is arranged in the central main bearing plane and is intended to store the output shaft. This can a stable bearing for the output shaft by means of the central main bearing plane will be realized.

Preferably For example, the first and third bearing devices are coaxial with each other arranged, whereby the storage devices with respect to a space can be arranged advantageously.

Advantageously, the first and the third bearing device are arranged axially overlapping with respect to a longitudinal direction of the dual-clutch transmission. As a result, an axial space can be further optimized. In principle, however, the bearing devices can also be arranged with respect to the longitudinal direction of the transmission with an axial offset from one another. A "longitudinal direction" is to be understood in particular as meaning a main direction of extent of the dual-clutch transmission, which is characterized in particular by the Given the course of the input shafts and the output shaft.

Further It is proposed that a fourth bearing device one of the input shafts across from a transmission housing stores and that a fifth Bearing device another input shaft relative to the aforementioned input shaft outsourced. Thereby can the input shafts are stored very stable. This is especially true when at least the fourth storage device or the fifth storage device is arranged in the input-side main bearing level. Likewise applies this if the two input shafts through a sixth storage device, preferably on the input side with respect to the longitudinal direction of the transmission from the front main bearing level, stored against each other are.

advantageously, has the dual clutch transmission in addition to a first countershaft a second executed as a hollow shaft Countershaft and arranged in the central main bearing level seventh bearing device provided for, the second To store countershaft, and alternatively or additionally a arranged in the central main bearing level eighth bearing device for the storage of the first countershaft relative to the second countershaft. As a result, the central main bearing plane can be advantageous for storage can be used and it can only be on a main storage level is provided for supporting the countershaft, be waived, wherein the second countershaft stored in a simple manner stable can be.

there It is suggested that the seventh and eighth bearing devices be coaxial and / or overlapping with respect to a longitudinal direction are arranged. As a result, a particularly stable storage can be achieved and it can be done as well Space taken by the storage devices, reduced become.

Preferably is the fourth and / or fifth storage device designed as a fixed camp. This allows the waves to move in easily be fixed in its axial position. Under a "fixed camp" should thereby In particular, a storage device to be understood that a stored Element fixed in all three directions of translation and only allows a rotation. In particular, it is proposed that at least one storage device each shaft is designed as a fixed bearing.

Further It is proposed that at least the third storage device as a floating bearing is formed. This can cause a change in length the wave, for example, by a change in temperature, easily compensated become. Under a "floating camp" should thereby In particular, a storage device to be understood, which is a movement the rotatably mounted element in at least one direction, preferably along the axis of rotation, allows.

advantageously, At least one bearing device has a tapered roller bearing. As a result, a particularly advantageous storage device can be realized become.

In A further development is proposed that the dual-clutch transmission a gearbox with two gear housing parts and a connection unit provided for the transmission case parts to connect. This makes the storage concept easy in the gearbox integrated and in particular a mounting can be simplified.

Further a connection unit is proposed, provided for this purpose is to connect the central main bearing level with the gear housing. As a result, the central main bearing plane can be easily fixed and attached the gearbox be connected.

Especially should the connection unit of the central main bearing level be intended to the central main bearing plane with at least one gear housing part connect to. This allows in particular a firm connection between the Main storage levels are produced.

In addition, will suggested that the connection unit of the central main bearing level and the connection unit of the transmission housing are at least partially made in one piece. Thereby can costs for the connection units are lowered.

Preferably the connection unit has at least one screw element. Thereby can realize a particularly simple and inexpensive connection unit become.

Further It is suggested that the mean main bearing level at least a first bearing wall element and a second bearing wall element, whereby simply a multipart design and realized a simple attachment concept for the storage devices can be. In particular, a two-part design is advantageous.

Advantageously, the first bearing wall element on a bearing seat, which is intended to receive the first bearing device for the output shaft. As a result, it is easy to realize a receptacle for the bearing of the output shaft. Under a bearing seat is to be understood in particular an embodiment of the main bearing level who the one intended to receive a bearing device. By "provided" is to be understood in this context in particular that a force for a connection of the bearing device to the main bearing level substantially, ie more than 50%, is passed over the corresponding bearing seat and the bearing seat thereby significantly contributes to the storage of the bearing device.

Further It is proposed that the second bearing wall element has a bearing seat provided therefor, the seventh bearing device for the countershaft take. This can easily be a receptacle for storage the counter-wave, which in particular is considered independent of the recording for the bearing of the output shaft can be.

In addition, will proposed that at least one of the bearing seats at least adjoin the first bearing wall element and the second bearing wall element. As a result, a simple assembly with high strength can be achieved become.

Further Advantages are shown in the following description of the drawing. In the drawing are two embodiments represented the invention. The drawing, the description and the Claims included numerous features in combination. The skilled person will become the characteristics expediently also individually consider and summarize to meaningful further combinations.

there demonstrate:

1 a schematic representation of a dual clutch transmission in a first embodiment and

2 a schematic representation of a dual clutch transmission in a second embodiment.

Same Elements are provided in both figures with the same reference numerals.

1 shows a dual-clutch transmission of an exemplary gear arrangement. The dual-clutch transmission has two input shafts 10 . 11 and an output shaft 26 on. The input shafts 10 . 11 are arranged coaxially, wherein the first inner input shaft 10 is formed as an inner shaft, which is the second outer input shaft 11 , which is designed as a hollow shaft, interspersed. The output shaft 26 is coaxial with the input shafts 10 . 11 arranged.

To form sequentially power-shiftable forward gears, the dual clutch transmission gears, which are partially formed as loose wheels and partially as fixed wheels. The gears are arranged in seven gear levels E1, E2, Z1, Z2, Z3, Z4, Z5. Two gear levels are provided as input constants E1, E2 and are non-rotatably connected or connectable to at least one of the input shafts. A further gear level Z1 can be used both as an input constant and as a gear pair to form a gear ratio stage, in particular a forward gear, and can be used both with the inner input shaft 10 as well as with the output shaft 26 get connected. The remaining gear levels Z2, Z3, Z4, Z5 are provided as translation stages for the forward gears and for reverse gears.

Parallel to the input shafts 10 . 11 and the output shaft 26 are two countershafts 27 . 28 arranged on the gear levels E1, E2, Z1, Z2, Z3, Z4, Z5 operatively connected to the input shafts 10 . 11 and the output shaft 26 are connectable.

Next, the dual clutch transmission has a transmission housing 29 with two gear housing parts 30 . 31 on. The two gear housing parts 30 . 31 are via a connection unit 32 connected with each other.

For storage of the two input shafts 10 . 11 , the output shaft 26 and the two countershafts 27 . 28 has the dual clutch transmission according to 1 a storage concept with 10 storage devices 15 - 24 basically, regardless of the in 1 shown gear arrangement is. According to the embodiment according to 2 The dual-clutch transmission has two further storage devices L and M. Furthermore, the storage concept is basically also applicable to dual-clutch transmission with two coaxial input shafts, which have a different number of gear levels than the dual-clutch transmission shown.

The dual-clutch transmission has three main bearing levels 12 . 13 . 14 and a storage level 38 on where the storage devices 15 - 24 are arranged.

Particularly advantageous in terms of the absorption of forces, the coaxial storage devices of a main storage level or storage level are arranged completely overlapping axially with respect to a longitudinal direction of the double clutch transmission. However, due to structural conditions, these can also only partially axially overlapping or axially offset adjacent to each other, as in 2 represented, may be arranged. The storage devices thus have particularly advantageous their axial center on a main storage level or storage level. However, according to the invention, too Location of the axial center of the storage device in the spatial vicinity of a main storage level or storage level possible. In particular, the fifth storage device 15 axially overlapping, but offset in the direction of the gear plane E1, or according to the embodiment according to 2 no longer axially overlapping, but adjacent in the direction of the gear plane E1, with the fourth bearing device 17 be arranged. The fourth storage device 17 and the fifth bearing device 15 are always arranged coaxially. Likewise, in particular according to the embodiment according to 2 the third storage device 16 axially offset in the direction of the gear level Z2, even to between the gear levels Z1 and Z2, but advantageously still between the gear level Z2 and a located between the gear levels Z1 and Z2 shift sleeve, to the first bearing device 18 be arranged.

The input-side main bearing level 12 is by means of the first gear housing part 30 formed and arranged in front of the first gear level E1.

The output side main bearing level 13 is by means of the second gear housing part 31 educated. It is arranged after the last gear level Z5.

Between the input-side main bearing level 12 and the output-side main bearing level 13 is the mean main bearing level 14 arranged. The central main bearing level 14 is by means of a bearing wall 25 educated. It is arranged in the axial direction between the fourth gear plane Z2 and the fifth gear plane Z3. This is a number of before the central main bearing level 14 arranged gear levels E1, E2, Z1, Z2 by one greater than a number of gear levels Z3, Z4, Z5, behind the central main bearing plane 14 are arranged.

The storage level 38 is arranged in the second gear level E2.

The central main bearing level 14 that by means of the bearing wall 25 is formed, is via a connection unit 33 with the two gear housing parts 30 . 31 connected. Here are the connection unit 32 that the transmission housing parts 30 . 31 connects together, and the connection unit 33 representing the mean main bearing level 14 with the gear housing parts 30 . 31 connects, made in one piece. The connection units 32 . 33 have to common screw elements 39 . 40 on that through the two gearbox parts 30 . 31 and the mean main bearing level 14 , or the storage wall 25 go through and connect them together.

For storage of the first inner input shaft 10 The dual-clutch transmission has the fifth bearing device 15 and the third storage device 16 on. The fifth storage device 15 is in the input-side main bearing level 12 arranged. The third storage device 16 is in the middle main bearing level 14 arranged. The fifth storage device 15 stores the inner input shaft 10 against the outer input shaft 11 , The third storage device 16 stores the inner input shaft 10 against the output shaft 26 , The fifth La ger device 15 is designed as a fixed bearing, the third storage device 16 as a loose bearing.

Furthermore, the dual-clutch transmission according to the embodiment according to 2 Advantageously, a sixth bearing device L on the input side of the input-side main bearing plane 12 that the inner input shaft 10 opposite the outer input shaft 11 stores, and / or a ninth bearing device M input side of a double clutch, the inner input shaft 10 opposite to an input shaft of the double clutch, which is radially outside of the inner input shaft 10 is arranged.

For storage of the second outer input shaft 11 The dual-clutch transmission has the fourth bearing device 17 on, which also in the input-side main bearing level 12 is arranged. The fourth storage device 17 stores the outer input shaft 11 directly in the input-side main bearing level 12 , whereby the outer input shaft 11 directly against the front gearbox part 30 is stored. About the fourth storage device 17 the outer input shaft 11 and the fifth bearing device 15 the inner input shaft 10 is the inner input shaft 10 indirectly in the first main storage level 12 and thus indirectly against the front gear housing part 30 stored. The fourth storage device 17 the outer input shaft 11 is designed as a fixed bearing.

For storage of the output shaft 26 The dual-clutch transmission has the first bearing devices 18 and the second storage device 19 on. The first storage device 18 the output shaft 26 is in the middle main bearing level 14 arranged. The second storage device 19 is in the output-side main bearing level 13 arranged. The first storage device 18 stores the output shaft 26 directly in the middle main storage level 14 and thus against the storage wall 25 , The second storage device 19 stores the output shaft 26 directly in the output-side main bearing level 13 and thus directly against the rear gear housing part 31 , About the first storage device 18 the output shaft 26 and the third storage device 16 the inner input shaft 10 is the inner input shaft 10 indirectly in the middle main storage level 14 and thus indirectly against the storage wall 25 stored. The third camp contraption 16 and the first storage device 18 are coaxial and intersecting with respect to a longitudinal direction. The first storage device 18 the output shaft is designed as a floating bearing, the second bearing device 19 as a fixed camp.

For storage of the first inner countershaft 27 The dual-clutch transmission has the eighth bearing device 21 , the tenth camp device 20 and the eleventh bearing device 22 on, each in one of the three main bearing levels 12 . 13 . 14 are arranged. The tenth camp device 20 stores the inner countershaft 27 directly in the input-side main bearing level 12 , The eighth bearing device 21 stores the inner countershaft 27 against the central main bearing level 14 and the eleventh bearing device 22 stores the inner countershaft 27 directly against the output side main bearing level 13 , The tenth camp device 20 and the eleventh bearing device 22 are designed as floating bearings. The eighth bearing device 21 is designed as a fixed bearing.

For storage of the outer countershaft 28 The dual-clutch transmission has the twelfth bearing devices 23 and the seventh bearing device 24 on. The twelfth bearing device 23 is at the warehouse level 38 between the input-side main bearing level 12 and the central main bearing level 14 arranged and stores the outer countershaft 28 against the counter-wave 27 , The seventh bearing device 24 is in the middle main bearing level 14 arranged and stores the outer countershaft 28 directly in the middle main storage level 14 , whereby the inner countershaft 27 over the eighth bearing device 21 the inner countershaft 27 and the seventh bearing device 24 the outer countershaft 28 indirectly in the middle main storage level 14 and thus indirectly against the storage wall 25 is stored. The eighth bearing device 21 and the seventh bearing device 24 are coaxial and overlapping with respect to the longitudinal direction. The twelfth bearing device 23 the outer countershaft 28 is designed as a floating bearing. The seventh bearing device 24 the outer countershaft 28 is designed as a fixed bearing.

All storage devices 15 - 24 are designed as rolling bearings. In principle, however, other embodiments are conceivable. Also, another arrangement of the floating bearing and the fixed bearing is conceivable.

For a simpler installation of the dual-clutch transmission, the middle by means of the bearing wall 25 trained main warehouse level 14 executed in several parts. The central main bearing level 14 has a first bearing wall element 34 with a bearing seat 36 for the first storage device 18 the output shaft 26 on. Next, the middle main bearing level 14 a second bearing wall element 35 with a bearing seat 37 for the seventh bearing device 24 the outer countershaft 28 on. To the bearing seat 37 of the second bearing wall element 35 also adjoins the first bearing wall element 34 at. A connection of the seventh storage device 24 the outer countershaft 28 but essentially takes place via the bearing seat 37 of the second bearing wall element 35 ,

The warehouse wall 25 Alternatively, it can also be made in one piece.

Claims (31)

Dual-clutch transmission with - at least four gear levels (E1, E2, Z1, Z2, Z3, Z4, Z5), of which at least two as input constants (E1, E2, Z1) and at least two as translation stages (Z1, Z2, Z3, Z4, Z5 ) are provided, - at least two coaxially arranged input shafts ( 10 . 11 ), - at least one input-side main bearing level ( 12 ), an output-side main storage layer ( 13 ) and a central main storage level ( 14 ), as well as - an output shaft ( 26 ), which via at least a first storage device ( 18 ) and a second storage device ( 19 ) located in two of the main bearing levels ( 13 . 14 ) are arranged in a transmission housing ( 29 ), wherein the first input shaft ( 10 ) by means of a third storage device ( 16 ) opposite the output shaft ( 26 ) is stored. Dual-clutch transmission according to claim 1, characterized in that the first input shaft ( 10 ) is designed as an inner shaft, which is designed as a hollow shaft outer input shaft ( 11 ) interspersed. Double-clutch transmission according to claim 1 or 2, characterized in that the third bearing device ( 16 ) for supporting the first input shaft ( 10 ) within the output shaft ( 26 ) is arranged. Double-clutch transmission according to one of the preceding claims, characterized in that the central main bearing plane ( 14 ) as a storage wall ( 25 ) is trained. Dual-clutch transmission according to one of the preceding claims, characterized in that a number of the gearwheel planes (E1, E2, Z1, Z2), which before the central main bearing plane ( 14 ) and a number of the gear levels (Z3, Z4, Z5) located behind the central main bearing plane ( 14 ) are arranged at a maximum of one another differ. Double-clutch transmission according to one of the preceding claims, characterized by a coaxial with the input shafts ( 10 . 11 ) arranged output shaft ( 26 ). Double-clutch transmission according to claim 6, characterized in that the first bearing device ( 18 ), which is provided to the output shaft ( 26 ) in the central main storage level ( 14 ) is arranged. Double-clutch transmission according to one of the preceding claims, characterized in that the first bearing device ( 18 ) and the third storage device ( 16 ) are arranged overlapping with respect to a longitudinal direction. Dual-clutch transmission according to one of claims 1 to 7, characterized in that the first bearing device ( 18 ) and the third storage device ( 16 ) are offset relative to each other with respect to a longitudinal direction. Dual-clutch transmission according to one of the preceding claims, characterized in that a fourth bearing device ( 17 ) one of the input shafts ( 11 ) relative to a transmission housing ( 29 ) and that a fifth storage device ( 15 ) another input shaft ( 10 ) with respect to the aforementioned input shaft ( 11 ) stores. Dual-clutch transmission according to one of the preceding claims, characterized in that at least the fourth bearing device ( 17 ) or the fifth storage device ( 15 ) in the input-side main bearing level ( 12 ) is arranged. Double-clutch transmission according to claim 10 or 11, characterized in that the fourth and fifth bearing devices ( 15 . 17 ) are arranged intersecting with each other with respect to a longitudinal direction of the transmission. Double-clutch transmission according to claim 10 or 11, characterized in that the fourth and fifth bearing devices ( 15 . 17 ) are offset relative to each other with respect to a longitudinal direction of the transmission. Double-clutch transmission according to one of the preceding claims, characterized in that the third bearing device ( 16 ), which is the one input shaft ( 10 ) opposite the output shaft ( 26 ) stores, is designed as a floating bearing. Double-clutch transmission according to one of the preceding claims, characterized in that the fifth bearing device ( 15 ), which is the one input shaft ( 10 ) opposite the other input shaft ( 11 ) stores, is designed as a fixed bearing. Double-clutch transmission according to one of the preceding claims, characterized in that the fourth bearing device ( 17 ), which is the one input shaft ( 11 ) relative to the transmission housing ( 29 ) stores, is designed as a fixed bearing. Double-clutch transmission according to one of the preceding claims, characterized in that the two input shafts ( 10 . 11 ) are supported by a sixth bearing device (L) against each other. Double-clutch transmission according to one of the preceding claims, characterized in that the sixth bearing device (L), the two input shafts ( 10 . 11 ) relative to one another with respect to a longitudinal direction of the transmission on the input side of the input-side main bearing plane ( 12 ) is arranged. Double-clutch transmission according to one of the preceding claims, characterized by a second countershaft ( 28 ) and one in the middle main storage level ( 14 ) arranged seventh storage device ( 24 ), intended to replace the second countershaft ( 28 ) to store. Double-clutch transmission according to one of the preceding claims, characterized by a first countershaft ( 27 ) and an eighth storage device ( 21 ), which is intended to cover the first countershaft ( 27 ) compared to the second counter-wave ( 28 ) to store. Double-clutch transmission according to claims 19 and 20, characterized in that the seventh bearing device ( 24 ) and an eighth storage device ( 21 ) are arranged coaxially and / or overlapping with respect to a longitudinal direction. Dual-clutch transmission according to one of the preceding claims, characterized in that at least one bearing device ( 15 - 24 ) has a rolling bearing. Double-clutch transmission according to one of the preceding claims, characterized by a transmission housing ( 29 ) with two gear housing parts ( 30 . 31 ) and a connection unit ( 32 ), which is intended to the transmission housing parts ( 30 . 31 ) connect to. Double-clutch transmission according to one of the preceding claims, characterized by a connecting unit ( 33 ) intended to cover the central main storage area ( 14 ) with the gearbox housing ( 29 ) or at least one gear housing part ( 30 . 31 ) connect to. Double clutch transmission according to claim 24, characterized in that the connection unit ( 33 ) of the central main storage level ( 14 ) and the connection unit ( 32 ) of the transmission housing ( 29 ) are executed at least partially in one piece. Double-clutch transmission according to at least one of claims 21 to 25, characterized in that the connection unit ( 32 . 33 ) has at least one screw. Double-clutch transmission according to one of the preceding claims, characterized in that the central main bearing plane ( 14 ) at least a first bearing wall element ( 34 ) and a second bearing wall element ( 35 ) having. Dual-clutch transmission at least according to claim 27, characterized in that the first bearing wall element ( 34 ) a bearing seat ( 36 ), which is provided to the first storage device ( 18 ) for the output shaft ( 26 ). Double-clutch transmission at least according to claims 19 and 27, characterized in that the second bearing wall ( 35 ) a bearing seat ( 37 ), which is provided to the seventh bearing device ( 24 ) for the second counter-wave ( 28 ). Dual-clutch transmission according to at least one of claims 28 and 29, characterized in that the at least one bearing seat ( 37 ) at least the first bearing wall element ( 34 ) and the second bearing wall element ( 35 ). Double-clutch transmission according to one of the preceding claims, characterized in that the number of the output shaft ( 26 ) arranged fixed or loose wheels (respective gears of the gear pairs Z2, Z3, Z4, Z5) is equal to or greater than the sum of the numbers of those fixed or loose wheels (respective gears of the gear pairs E1, E2, Z1), on the two input shafts ( 10 . 11 ) are arranged.