Drive device for an all-wheel drive motor vehicle

(42) Date of commencement of the patent: 15. 8.1989 (45) Date of issue: 12. 3.1990

<td>(56) Documents:</td><td>(73) Patent owner:</td>

<td>EP-A2 48093 DE-OS2127761 US-PS4111069</td><td>STEYR-DAIMLER-PUCH AKTIENGESELLSCHAFT A-1010 VIENNA (AT).</td>

<td></td><td>(72) Inventor:</td>

<td></td><td>FRIEDRICH KARL ING. LEIBNITZ, STEIERMARK (AT). LEINFELLNER HERWIG DIPL.ING. GRAZ, STYRIA (AT). ASHIKAWA NOBORU SAITAMA (JP).</td>

(54) DRIVE DEVICE FOR A ALL-ROAD DRIVEN VEHICLE

CO

AT 390 036 h / r amcoB

No. 390036

The invention relates to a drive device for a four-wheel drive motor vehicle with a speed change gearbox, whose waves are parallel to the vehicle axles, and with a via a pair of Stimradpaar driven by the output shaft of the speed change gear ratchet gear, on the one hand via a further Stimradpaar and a bevel drive drives the drive shaft to the remote from the speed change gear vehicle wheels and on the other hand via a Kegelradausgleichgetriebe the drive shafts of the closer Fahaugeugräder, wherein the drive device for all these parts has a common multi-divided housing and the speed change gear comprising the housing part to a bearing for the shaft of the Stimradausgleichgetriebes or the wall receiving a drive half-wave is enlarged and the immediately adjacent housing part has the bearings of the shafts of the speed change gear adjacent to the motor

Such a drive device is already known (DE-OS 3,116,411). In this case, although the housing part comprising the speed change gear mechanism and the housing part directly adjoining it have a graduation plane which runs normal to the shafts of the speed change gearbox, and it is also that housing part, the stimulus gear, encloses the bevel gear reducer and the bevel gear, attached to the case immediately adjacent to the speed change gear housing with said waves normal pad, but it consists of the differential and the bevel gear comprehensive housing part for assembly reasons of two parts, in the division plane lie the axes of the different waves. The entire device housing therefore has graduation levels that are normal to each other, which not only complicates the production in die casting, but also causes assembly difficulties and especially unfavorable conditions for the seal of the colliding at a right angle parts.

Although it is already known to arrange in a drive device all pitch levels of the housing parallel to each other and normal to the transmission shafts (EP-A-2 48 093), but this is hiebei a very different construction, in place of a speed change gear with transverse to the direction of travel waves, a torque converter is provided; Spur gear and Kegelradausgleichgetriebe missing and no four-wheel drive is done

Accordingly, the invention has for its object to improve the initially described drive device so that there is a simplification in the manufacture and assembly and no sealing difficulties occur.

The invention solves this problem by that in a conventional manner, all the dividing planes of the housing are arranged parallel to each other and normal to the shafts of the speed change gear and that the housing is formed substantially in three parts, wherein the enlarged wall of the speed change gear comprehensive first housing part also carries a bearing for the drive shaft of the Kegeltriehes, the immediately adjacent middle part of the housing has further bearings of the Stimradausgleichgetriebes and the drive shaft of the bevel drive and the third housing part encloses the Kegelradausgleichgetriebe with a funnel and forms the remaining bearing points for the bevel gear and wherein a cover with a bearing for the bevel gear balancer is attached to the hopper

Thus, normally mutually oriented graduation levels are avoided, which brings gußtechnische advantages with it and, above all, allows easier installation, with unfavorable sealing conditions are avoided. In addition, an existing of a small number of individual parts, but still no mounting difficulties training the overall housing of the device is achieved

The drawing shows an embodiment of a drive device according to the invention for a four-wheel drive motor vehicle in section

The shafts of the speed change gear (1), of which all gears, but not the shift sleeves are shown, are parallel to the vehicle axles. From the output shaft (2) of the speed change gearbox (1) a Stimradausgleichgetriebe (5) is driven via a pair of Stimrad (3), (4). This Stimradausgleichgetriebe (5) drives on the one hand via another pair of Stimrad (6), (7) and a bevel gear (8) the drive shaft (9) to the speed change gear (1) remoter vehicle wheels. On the other hand, the output of the Stimradausgleichgetriebe (5) via a hollow shaft (10) and a Kegelradausgleichgetriebe (11) to the half-shafts (12) of the closer vehicle wheels. For all these parts a common multi-divided housing is provided.

It can be seen that all the pitch planes (El - E4) of the housing are arranged parallel to each other and normal to the shafts of the speed change gearbox (1). Here, the speed change gear (1) comprising the first housing part (13) is extended to a wall (14) having a bearing (15) for the shaft of the Stimradausgleichgetriebes (5) or one of the half-shafts (12) and the bearing (16) for the drive shaft of the bevel gear (8) receives. The immediately adjacent central housing part (17) has the motor adjacent to the bearing (18) of the shafts of the speed change gearbox (1). The third housing part is denoted by (19). The housing middle part (17) has a respective bearing (20) for the spur gear balancer (5) and the drive shaft of the bevel drive (8) and the third housing part (19) surrounds the bevel gear balancer (11) with a Funnel (21) and forms the remaining bearing points (22) for the bevel gear (8), wherein at the hopper (21) a lid (23) with a bearing (24) for the bevel gear balancer (11) is attached

-2Nr. 390036