DE102008042038A1 - Drive train arrangement for vehicle, has main gearbox and power divider which is fastened as component whose drive shaft is connected with rear axle differential gear, where power divider comprises power transmission unit - Google Patents

Abstract

The drive train arrangement has a main gearbox (3) and a power divider (5) which is fastened as a component, whose drive shaft (10) is connected with a rear axle differential gear. The power divider comprises a power transmission unit which is coupled with the drive shaft of the power divider to a front axle differential gear (9) by a torque transmission element. A beveloid drive comprises two beveloid gears (11,12), where one beveloid gear is arranged as an idle gear coaxial to the drive shaft.

Description

The The present invention relates to a powertrain arrangement for a vehicle with a main transmission according to the in the preamble of claim 1 defined in more detail Art.

For example, from the document DE 202 12 093 U1 is a powertrain for vehicles with all-wheel or front-wheel drive and arranged along the direction of travel overall gear known. The drive train comprises an internal combustion engine whose drive torque is transmitted via a starting element to a central transmission. The output shaft of the central transmission is connected via an additional gear stage with a built-in central transmission torque distribution device. The torque distribution device has two output shafts for distributing the drive power. The one output shaft of the torque distribution device is connected to the rear differential for driving the rear wheels. The other output shaft of the torque distribution device has a conically shaped gear, which is in engagement with a cylindrical gear of a side shaft.

The Side wave in turn is a conical Gear with the drive teeth of a Vorderachsdifferentialgetriebes engaged. The torque distribution device is as a longitudinal differential gear formed with the first part of the drive torque A propeller shaft is passed along the vehicle leads to the differential gear in the area of the vehicle rear axle. The drive torque for driving the front wheels is over the above-described side wave also transmitted to the Vorderachsdifferentialgetriebe. Accordingly, in the known powertrain in addition to the torque distribution device to the other power transmission elements or Facilities necessary to an all-wheel drive in the vehicle to enable. In addition, is not a self-sufficient transfer case intended.

Further is known from automotive engineering a drive train in which a transfer case as so-called add-on system to the main transmission flanged as a self-sufficient component. The transfer case comprises as a power transmission device for Vorderachsdifferentialgetriebe a gear chain consisting of several gear stages with at least three gears. The power transmission device allows a power transmission over a connecting shaft directly to the Vorderachsdifferentialgetriebe. However, only an axis-parallel arrangement can be realized so that in the known drive train a possible Axial offset to the front axle differential only by additional Joints can be compensated.

Of the The present invention is based on the object, a drive train arrangement with a self-sufficient transfer case of the type described above To propose genus, in particular the transfer case is made more compact and lighter.

These The object is achieved by the features of claim 1, wherein advantageous embodiments executed in the subclaims and the drawings are.

Therefore becomes a powertrain arrangement for a motor vehicle proposed with a main gear on which a transfer case is attached as a self-sufficient component whose output shaft with a Hinterachsdifferentialgetriebe is connected. According to the invention provided that the transfer case as a power transmission device only one z. B. trained as Beveloidtrieb or the like wheel comprising, which via a torque transfer device for adjusting a driving torque at the front differential gear can be coupled with the output shaft of the main transmission.

With the only one wheel step or gear stage in power transmission can in the proposed powertrain arrangement on components be omitted, so that a particularly compact, with provided as small a diameter and reduced weight Transfer case is realized in the drive train of a vehicle. In addition, a possible misalignment with the beveloid drive balanced as part of the power transmission device become.

Preferably may Beveloidtrieb as a power transmission device between the main transmission and the transfer case and the Vorderachsdifferentialgetriebe is used. With this gear technology it is possible to realize a skewed axial offset with a connecting shaft, to a direct connection to the Vorderachsdifferentialgetriebe form without further components are needed. Consequently is the use of joints or the like and other additional Components for compensating a possible misalignment in the inventively proposed Antriebsstranganordnung not mandatory. Instead of Beveloidtriebs can also other constructive means are used, which are skewed Arrangement of the connecting shaft of the front axle differential to the drive train enable.

According to an advantageous embodiment of the invention can be provided that the Beveloidtrieb used, for example, two Bevelo idzahnräder includes, wherein a first Beveloidzahnrad is preferably arranged as a loose wheel coaxial with the output shaft of the transfer case. The second beveloid gear may, for example, be connected to the connecting shaft which drives the front-axle differential gear. However, there are also other structural embodiments of Beveloidtriebs conceivable, such. B. to arrange the clutch or the idler gear on the connecting shaft.

The Connection between the output shaft of the transfer case or the output shaft of the main transmission can preferably by a designed as a torque transmitting element coupling will be realized. By an appropriate control of the clutch can transmit a specific drive torque to the Vorderachsdifferentialgetriebe as needed become. The z. B. from the main transmission autarkic clutch control in the add-on transfer case can be electric, hydraulic, pneumatic or the like. Preferably, the coupling on the one hand with the first Beveloidzahnrad and on the other hand with the output shaft be connected to the transfer case, but also other transmission paths can be used. It is also conceivable that others Torque transfer elements are used.

following The present invention will become more apparent from the drawings described. Show it:

1 a schematic side view of a possible embodiment of a drive train arrangement according to the invention; and

2 a schematic view of a power transmission device of the drive train arrangement according to the invention.

In 1 a possible embodiment of a drive train arrangement according to the invention for a vehicle is partially shown. The delivered by a drive motor not shown drive torque is indicated by an arrow 1 and the transmitted to a not-shown rear differential gear drive torque by an arrow 2 indicated in the drive train arrangement according to the invention.

The powertrain also includes a main transmission 3 , which has a starting element 4 is coupled to the drive motor for torque transmission. To the main gearbox 3 is a self-sufficient component of a transfer case 5 attached. Preferably, this is designed as a so-called add-on system transfer case 5 to the main gearbox 3 flanged. These are corresponding attachment points 6 on the housing of the main gearbox 3 intended. At the connection area 8th between the main gearbox 3 and the transfer case 5 is the output shaft 7 of the main gearbox 3 with a shaft of the transfer case 5 connected.

According to the invention it is provided that the transfer case 5 the drive train arrangement as a power transmission device comprises only one designed as Beveloidtrieb wheel, which via a torque transmitting element for adjusting a driving torque to a Vorderachsdifferentialgetriebe 9 with an output shaft 10 of the transfer case 5 can be coupled.

The Beveloid drive includes two Beveloidzahnräder 11 and 12 , The first beveloid gear 11 is as idler gear coaxial with the output shaft 10 of the transfer case 5 arranged. The second beveloid gear 12 is with a connecting shaft 13 firmly connected. The connecting shaft 13 in turn serves to drive the Vorderachsdifferentialgetriebes 9 and is associated with this.

As a torque transmitting element is a friction clutch 14 intended. The friction clutch or multi-plate clutch 14 is on the one hand with the output shaft 10 of the transfer case 5 connected. On the other hand, the clutch 14 with the first beveloid gear 11 connected to the Beveloid drive. Because the first Beveloidzahnrad 11 with the second Beveloidzahnrad 12 is engaged, with the Beveloidtrieb designed as a power transmission device, a power transmission from the output shaft 10 of the transfer case 5 over the Beveloid gears 11 . 12 and the associated connection wave 13 on the Vorderachsdifferentialgetriebe 9 realized. By the controllable clutch and the transmitted via the clutch drive torque can be controlled.

In 2 the wheel chain is shown as a power transmission device. The wheel chain includes the first Beveloidzahnrad 11 and the second beveloid gear 12 which comb each other. At the second Beveloidzahnrad 12 is the connecting shaft 13 attached, which is the drive torque to the front axle differential 9 transfers.

1

arrow

2

arrow

3

main gearbox

4

starting element

5

Transfer Case

6

fastening point

7

output shaft of the main gearbox

8th

connecting area

9

Vorderachsdifferentialgetriebe

10

output shaft of the transfer case

11

first Beveloidzahnrad

12

second Beveloidzahnrad

13

connecting shaft

14

clutch

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 20212093 U1 [0002]

Claims (4)

Drive train arrangement for a motor vehicle with a main transmission ( 3 ) on which a transfer case ( 5 ) is attached as a self-sufficient component whose output shaft ( 10 ) is connected to a Hinterachsdifferentialgetriebe, characterized in that the transfer case ( 5 ) comprises a Beveloidtrieb designed as a power transmission device wheel stage, which via a torque transmitting element for adjusting a drive torque to a Vorderachsdifferentialgetriebe ( 9 ) with the output shaft ( 10 ) of the transfer case can be coupled. Drive train arrangement according to claim 1, characterized in that the Beveloidtrieb two Beveloidzahnräder ( 11 . 12 ), wherein a first Beveloidzahnrad ( 11 ) as idler gear coaxial with the output shaft ( 10 ) of the transfer case ( 5 ) and wherein a second Beveloidzahnrad ( 12 ) with a connecting shaft ( 13 ), which the Vorderachsdifferentialgetriebe ( 9 ) drives. Drive train arrangement according to one of the preceding claims, characterized in that as torque-transmitting element at least one clutch ( 14 ) is provided. Drive train arrangement according to claim 3, characterized in that the clutch ( 14 ) on the one hand with the first Beveloidzahnrad ( 11 ) and on the other hand with the output shaft ( 10 ) of the transfer case ( 3 ) connected is.