Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1986-06-16
1988-08-16
Reger, Duane A.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188 3R, 188112R, 323 7, 323 20, B60T 720
Patent
active
047639580
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus in a vehicle combination with air pressure brakes and with a coupling between a tractor vehicle and a trailer vehicle, for matching the brake pressure to the actual load.
The vehicle combinations that may be referred to, are the combination of a tractor vehicle with a trailer vehicle connected therewith, and semi-trailers, wherein the primary brake pressure has to be reduced to a secondary pressure matching the load, in order to obtain at braking of the vehicle combination a brake pressure which is distributed to the units of the vehicle combination according to the actual load. This matching should be made in order to avoid wheel locking at braking, overheating of the brakes, unnecessary tyre wear, and unnecessary wear of the coupling between the tractor vehicle and the trailer vehicle, etc.
For this purpose there has previously been used in vehicle combinations comprising a tractor vehicle and a trailer vehicle, so-called load-sensing valves which are positioned between the chassis frame and the wheel shaft so as to be actuated in dependence on the chassis frame supported by springs on the wheel shafts being depressed more or less by the actual load. These load sensing valves have been found to function unsatisfactorily on the tractor vehicle as well as the trailer vehicle, because they are positioned in aggressive environment, which requires exceptionally extensive maintenance, and because they tend to stick by freezing in a cold climate. Moreover, they can hardly be used on trailer vehicles, because the trailer vehicle usually has a harder spring suspension necessary in order to make the vehicle stable, and the spring movement between unloaded trailer vehicle and fully loaded trailer vehicle as a consequence thereof is so small (only a cm or two) that it can hardly be utilized when the control has to be accurate. The load sensing valves shall automatically provide the necessary matching of the brake pressure, but this automatic function is unreliable, because it can in no way be controlled.
The purpose of the invention is to provide an apparatus of the kind referred to above which makes possible a reliable and accurate matching of the brake pressure and distribution of the brake pressure on the units of the vehicle combination irrespective of the actual load or load distribution of the vehicle combination.
This is achieved by the apparatus of the invention having obtained the characteristics according to claim 1.
The apparatus of the invention provides a reliability which is superior to that obtained with load sensing valves, which means an increased safety in traffic.
In order to explain the invention in more detail embodiments thereof will be described below with reference to the accompanying drawings in which
FIG. 1 is a diagrammatic plan view of a vehicle combination comprising a tractor vehicle and a trailer vehicle, wherein the apparatus of the invention is provided,
FIG. 2 is a diagrammatic view of a regulator unit in the apparatus of the invention,
FIG. 3 is a horizontal sectional view of a transducer included in the coupling device of the tractor vehicle,
FIG. 4 is a side view of a transducer in the apparatus of the invention for measuring the actual loading of the vehicle,
FIG. 5 is a block diagram of an electronic unit in the apparatus of the invention, and
FIG. 6 is a diagram of a turn bearing brake which may be included as a complement in the apparatus of the invention.
In FIG. 1 there is shown a tractor vehicle 10 with a driver's cabin 11 and with a coupling device 12 at the rear end, to which a trailer vehicle 13 is connected by means of a tow bar 14. On the vehicle there is provided an air conduit 15 for primary brake pressure to a regulator unit 16 for the brakes of the tractor vehicle and an air conduit 17 to a regulator unit 18 for the brakes of the trailer vehicle. The primary pressure in the conduits 15 and 17 has to be reduced to a pressure, the secondary pressure, which is matched to the actual load on the tractor vehicle and the trailer vehi
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Graham Matthew C.
Reger Duane A.
VBG Produkter AB
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