Motor vehicles – Special driving device – Portable track
Patent
1984-07-13
1987-02-03
Pekar, John A.
Motor vehicles
Special driving device
Portable track
301 36A, 301 43, 305 39, 152209R, B62D 5300, B62D 5302, B60D 1500
Patent
active
046403779
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a motor vehicle having at least one profiled tread with transverse profiling, whose segments in the form of cleats, transverse ribs or the like are arranged with spacing in the running direction.
Motor vehicles having profiled treads, such as crawler or track-laying vehicles, are usable in many ways on account of their cross-country capability. Such profiled treads, however, have the disadvantage of rough running when the vehicle is traveling over flat terrain. A particular disadvantage results when rounding curves or turning in place, since the road surface is considerably damaged thereby. Similar problems also occur in vehicles in which the profiled treads are formed by cleats on the running wheels.
It is the object of the invention to create a vehicle having great cross-country capability, but at the same time being distinguished by very smooth running on flat surfaces.
This object is achieved in accordance with the invention in that the profiled tread consists of two partial profiles which are adjustable relative to one another in the running direction.
The division of the profiled tread into two partial profiles which are adjustable relative to one another in the direction of movement makes it possible to dispose the segments of the two partial profiles such that the segments of the one partial profile are offset laterally, but are situated at the intervals between the segments of the other partial profile. The vehicle thus contacts the ground with the segments of both partial profiles.
The reduction to practice of the partial profiles can be accomplished in a variety of ways. For example, the partial profiles can be formed on two coaxial running wheels situated side by side. These two wheels, each bearing one partial profile, can form the rear wheel, for example, of a motorcycle. It is also possible, however, to provide the partial profiles on crawler or track-laying vehicles. In this case, the vehicle has two crawler belts on each side, each provided with a partial profile. Also, it is possible to form the partial profiles of one profiled tread of one wheel and one crawler belt.
In all applications, relatively smooth running will result when the partial profiles are offset relative to one another, since then the gaps between the segments of the one partial profile are equalized by the segments of the other partial profile. This smooth running results not only in less vibration of the vehicle itself but also in a reduction of noise. On account of the better distribution of the load, negotiating curves and turning in place result in far less damage to the ground surface by the vehicle.
If the profiled treads are offset such that the segments are situated side by side, the vehicle has the cross-country capability of other known vehicles of its kind.
It is desirable that the segments of one profiled tread be adjustable by at least half of the mean distance between two successive segments, so that the segments of the one partial profile can be set to the center between the segments of the other partial profile. The gap between the segments should be of approximately the same size and shape as the segments themselves.
The invention will be explained below by way of example, with the aid of FIGS. 1 to 8, wherein:
FIGS. 1 to 4 are elevations of a pair of running wheels of one side of a vehicle, each wheel having a partial profile of a profiled tread, as seen from the front and from the side,
FIGS. 5 to 8 are similar representations of a pair of running wheels on one side of a vehicle over which wheels runs a crawler belt and
FIGS. 9 and 10 illustrate further embodiments of the invention.
FIGS. 1 to 4 show the construction of a profile tread on two coaxial running wheels 13 of a vehicle V. Each running wheel 13 has a partial profile 11. The two partial profiles of the running wheels together form a profiled tread. The wheels are rotatable relative to one another and thus the partial profiles are adjustable relative to one another. The partial profiles consist of segments or cleats 12
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patent: 4102423 (1978-07-01), Reid
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