Motor vehicles – Vehicle trains – Motorized trailer
Patent
1989-10-25
1991-02-12
Marmor, Charles A.
Motor vehicles
Vehicle trains
Motorized trailer
180307, 180308, 60421, B62D 5902, B62D 5500
Patent
active
049916726
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an automatic control system for the transfer of the drive power between a tractor and a trailer.
High requirements are imposed on the systems for the transmission of drive power of vehicles intended for operation in severe cross-country conditions. The basic starting point is that, in a tractor-trailer combination that hauls heavy loads of timber, both the tractor and the trailer are provided with drive gears of their own. Thereat, in particular when there are hills in the terrain, a problem arises concerning how to made the drive power transmission systems of the tractor and of the trailer operate interdependently. When the drive power is lowered in the tractor, the drive power must also be lowered in the trailer. When this doesn't happen, the trailer pushes and, in the case of a combination provided with an articulated joint, there is a risk of the combination becoming folded at the middle. In a corresponding way, when the power requirement becomes higher in the tractor, the drive power must also increase in the trailer.
In Finnish Pat. Appl. No. 863464, a system for the control of the drive power transmission is disclosed, wherein the system consists of two circuits that are closed. This arrangement of equipment requires separate means that produce a signal for automatic effecting of the control. In Danish Pat. No. 1150/80, a system is disclosed wherein the tractor and the trailer do not have separate hydraulic circuits. The trailer employs the hydraulic system of the tractor, and the invention is based on a hydraulic clutch between the hydraulic motor and the drive wheels and on the control of said clutch. On the other hand, in British Pat. No. 1,260,438 a hydraulic circuit is disclosed wherein the control of this trailer drive takes place mechanically depending on the difference in speed between the tractor and the trailer. In the Swedish Pat. No. 396,323, a power transmission solution for a trailer is disclosed wherein the trailer is provided with a combustion engine of its own.
SUMMARY OF THE INVENTION
The object of the present invention is a power transmission system of an entirely novel type. wherein only one drive engine is used. The object is a power transmission system wherein it is possible to regulate the drive powers of the trailer and the tractor automatically and interdependently and such that, when the drive power becomes higher in the tractor, the drive power is increased accordingly in the trailer and, in a corresponding way, when the power requirement becomes lower in the tractor, the drive power is also lowered in the trailer.
The drive power transmission system in accordance with the invention is mainly characterized in that the control system comprises a line that transmits a control pressure from the closed circuit of the tractor to the open circuit of the trailer, whereby, when the resistance to traction increases, e.g. when driving up a steep hill, the pressure in this transmitting line increases and, by means of this pressure, the hydraulic pump of the trailer, which is preferably an adjustable-displacement pump, is controlled to produce a higher pressure to the motor or motors driven by the pump and, in a corresponding way, when the drive power requirement of the tractor becomes lower, the operating pressure in the hydraulic circuit of the drive power transmission in the trailer is lowered.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described with reference to some preferred embodiments of the invention shown in the Figures in the accompanying drawings, the invention being, however, not assumed to be confined to said embodiments alone.
FIG. 1 is a side view of a tractor trailer combination.
FIG. 2 shows the tractor trailer combination of FIG. 1 viewed from above, and the essential components of the drive power transmission system have been added to the figure schematically.
FIG. 3 shows the circuitry diagram of the hydraulic system of the drive power transmission system in accordance with t
REFERENCES:
patent: 3747722 (1973-07-01), Finney
patent: 3817341 (1974-06-01), Greene
patent: 3910369 (1975-10-01), Chichester et al.
patent: 4027738 (1977-06-01), Lundin
patent: 4369855 (1983-01-01), Buschbom et al.
patent: 4396087 (1983-08-01), Rock et al.
patent: 4542990 (1985-09-01), Fouquet
Johnson Brian L.
Marmor Charles A.
Orion-Yhtyma Oy Normet
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