Motor vehicles – Having at least one wheel both driven and steerable – Steerable wheel has exclusive axis of pivot
Patent
1991-05-22
1993-08-17
Focarino, Margaret A.
Motor vehicles
Having at least one wheel both driven and steerable
Steerable wheel has exclusive axis of pivot
180 55, 180 691, 180374, 180381, B60K 502, B60K 1724
Patent
active
052360610
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This is a National Phase Application of PCT/EP89/01368 filed 15 Nov. 1989 and based, in turn, upon German national application P 38 39 821.4 filed 25 Nov. 1988.
FIELD OF THE INVENTION
The invention relates to a steerable rigid axle on a chassis of a tractor, whereby the chassis is of modular construction at least in the areas of its construction units--engine, flywheel housing and transmission--and is spring-mounted with respect to the rigid axle. The assembly has a propeller shaft tube arranged in the region of the transverse median plane of the rigid axle acts upon the latter with one end, the other end of the propeller shaft tube being mounted to rotate freely in a support bearing block of the chassis by means of the spherical part of a universal joint.
BACKGROUND OF THE INVENTION
An arrangement of the above-mentioned kind for a steerable rigid axle on a tractor is the subject of a previous patent document D.E. 38 34 693. The rigid axle arranged in front of the engine is centrally swingably suspended in a transverse wheel fork, which together with a combined spring and damper element takes care of the suspension of the rigid axle. In one variant, the propeller shaft acting upon the rear side of the rigid axle runs centrally under the engine, which in this modular construction is connected with the flywheel housing and the transmission. In such a standard construction of the tractor using a spring-mounted rigid axle with propeller shaft, problems arise with respect to the construction of the engine oil sump, since the shaft limits considerably the space required for the oil sump. In a further variant, in order to avoid this problem a forked propeller shaft whose sides can laterally bypass the oil sump is used. The side parts running next to the oil sump reduce thereby the free space for the maximum excursion of the steering angle of the wheel which at that time is on the inside of the curve.
From the prospectus entitled "Technisches Konzept, Mercedes-Benz-Allradschlepper" MK 6703.3561.00-00/0287 a tractor with modular construction is known, whose propeller shaft acting upon the rigid axle is eccentrically arranged to bypass the engine oil sump and is supported on a power-drive transmission housing. Such a concept is not suitable for tractors of standard construction, wherein the construction units are connected to each other in a modular design.
OBJECTS OF THE INVENTION
It is the object of the present invention to arrange the propeller shaft tube of the rigid axle so that the ground clearance and the maximum excursion of the steering angle remain unimpaired. It is another object to support of the propeller shaft tube on the chassis side without essential modifications of the tractor's construction.
SUMMARY OF THE INVENTION
This task is achieved by passing the propeller shaft tube through a tunnel-like recess of the engine oil sump and by providing a support bearing block on the oil sump in the area of its screwed connection with the flywheel housing. At least a segment of the housing is formed as an integral part of the oil sump.
By using a rigid axle with propeller shaft tube, only the construction of the engine oil sump has to be modified. Since the propeller shaft tube is arranged within the tunnel-like recess, on the one hand the ground clearance of the vehicle is preserved and on the other hand, the centrally running shaft tube does not impair the steerability of the vehicle.
If within the same production series tractors have to be equipped with or without spring-mounted steering axles, according to the invention for the spring-equipped version it is merely necessary to provide a variant of the oil sump with tunnel-like recess and support bearing block. In the area where it is connected to the flywheel housing, the oil sump can be readily reinforced to give it enough rigidity for receiving the support bearing block of the propeller shaft tube.
In order to implement the structure the bearing support block should have a median horizontal jointing pl
REFERENCES:
patent: 1885427 (1932-11-01), Gabli
patent: 3213958 (1965-10-01), Muller
patent: 4506756 (1985-03-01), Bergous
patent: 4709778 (1987-12-01), von Sivers
patent: 4804056 (1989-02-01), Toshikuni et al.
patent: 5065831 (1991-11-01), Murakami
"Technisches Konzept Mercedes-Benz Allradschlepper MK6703. 3561. 00-00/0287" Feb. 28, 1987, Daimler-Benz AG, Stuttgart-Unterturkheim Siele Seite 7.
Boehler A. M.
Dubno Herbert
Focarino Margaret A.
Zahnradfabrik Friedrichshafen AG
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