DE2166831A1 - Trailer chassis, suitable for caravans - having tandem wheel sets with common overrunning brake mechanism - Google Patents

Abstract

A high load-carrying capacity can be obtained by using four wheels, and the overrunning brake mechanism is adapted for uniform braking of all the wheels. Conveniently it includes a balance beam assembly operating the brakes through respective Bowden cables in response to input force from another cable. The trailer chassis has two longitudinal members or frame girders joined by two tubular cross-members, and the wheels are supported from these cross-members, optionally by trailing arms of a spring suspension. In one modification the Bowden cable extending to the overrun brake may act through a prestressed compression spring to ensure that braking is not effected until a predetermined pull acting on an individual wheel brake is exceeded.

Description

The invention relates to a brake system for a trailer vehicle, in particular Caravan with a drawbar with an overrun brake and four wheels. (

In such trailer vehicles with four wheels, each with a wheel brake have, it is a problem to distribute the braking force evenly on the wheel brakes.

This object is achieved by the invention in that a brake force distributor is provided, on the one hand two wheel brakes pair

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wise and on the other hand the overrun brake are connected. To.this Purpose it is recommended to manufacture the brake force distributor from a frame-like frame with two levers mounted in it like a horizontal beam, Bowden cables leading to the wheel brakes are connected to the levers on both sides of the bearing and a connecting web in the frame between the levers is provided through which a Bowden connected to the overrun brake * train is guided. In this way it is achieved that the casserole- Brake resulting tractive force initially at one point on the frame-like Frame acts, whereby it is of course advisable to use this connection of the Central and symmetrical Bowden cable to be provided. This frame-like frame now transfers the braking force to the two vertical lever bearings Levers to each of which two Bowden cables for the wheel brakes are connected. These horizontal bar-like levers can adjust to the V / resistance of the wheel brakes freely adjust and accordingly branch the braking force evenly.

In order to avoid overloading the individual wheel brakes, the invention provides in the context of an advantageous embodiment that the Bowden cable leading to the overrun brake is connected to the over a prestressed compression spring Acts connecting web of the frame-like frame. The bias of the compression spring is chosen so that the spring is only under the braking force gives way when a certain, on each individual wheel brake acting Tensile force is exceeded.

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Details of the invention are shown schematically and in the drawing for example shown. Show it:

Fig. 1: a side view of the chassis,

Fig. 2: a plan view of the chassis according to Fig. 1 and

3: a view of a braking force distributor in the direction of the arrow A according to FIG. 2.

In the exemplary embodiments of FIGS. 1 to 3, there is a chassis frame for a Wohnwqpn, which has a total weight in of the order of 1,400 kg. The chassis frame Ί consists of the two longitudinally extending spars 2 with which above the flanges 4, two tubular housings 3, are firmly connected by rubber spring axles known from the art.

With the movable axle tube 9, which is elastic within the tubular housing 3 is performed, the wheels 7 and wheel hubs 6 are outside of the spars 2 supporting Lever 5 connected. The spars 2 have bent ends 8 on their side facing the towing vehicle, the bent angle of which is the Triangular shape of the drawbar is adapted. The drawbar (not shown) can be screwed to these ends 8.

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It is now a particular problem, the individual wheel brakes evenly to be actuated so that when the trailer is braked, no one-sided braking can take place. To this end the invention provides a brake force distributor 12 shown in FIGS. 2 and 3, which consists essentially of a frame-like frame 14, at its central Connecting web 17 is a Bowden cable leading to the overrun brake of the trailer 18 is connected * In the frame-like frame 14 vertical bearings 16 are arranged in which horizontal bar-like levers 15 are pivotably guided are, the ends of which each receive a Bowden cable 13. In each case two Bowden cables 13 are therefore guided in pairs on a horizontal bar-like lever 15. The action of the Bowden cable 18 is therefore initially the frame-like frame 14 moves in the direction of travel. The bearing 15 entrains the horizontal beam-like lever 15. Since this are pivotably mounted, there is a uniform branching of the braking force to the Bowden cables 13 of the individual wheel brakes.

To protect the wheel brakes from overload, the Bowden cable 18 is through the connecting web 17 of the frame-like frame 14 loosely hindubrchführung and connected to a spring plate 20, which from the rear over the compression spring 19 acts on the frame-like stand 14. This pretensioned compression spring 19 begins to give way only when a certain tensile force is exceeded at the individual wheel brake.

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It is finally shown in Fig. 2 that the Bowden cables 13 and the free end of the Bowden cable 18 is guided in a guide rail 21 which is firmly connected to the tubular housing 3 closest to the towing vehicle.

The invention is not restricted to the exemplary embodiments shown, but rather extends to all variants that arise to a person skilled in the art for solving the problem set in view of the disclosure according to the invention. \

Claims;

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Claims (3)

DIpI. Ing.HL-D. Ernicke Patent Attorney Dipl. Ing. H.-D. Ernicka 89 Augsburg Schwibbogenplatz 2b Tel. (0821) 55 4035 Telegr. Technikrat Augsburg Augsburg jt October 1975 Your reference P 21 66 831.5 File 706-10 Tr. Ni / sc! (n - Company Kober Manpar AG PATENT CLAIMS 1.) brake system for a trailer vehicle, in particular a caravan, the ^ν - ^ drawbar is provided with an overrun brake, which has four wheels, characterized in that a brake force distributor (12) is provided, on the one hand two wheel brakes in pairs and on the other hand the overrun brake are connected. 2.) Brake system according to claim 1, characterized in that g e k e η η ζ e i ch η e t, that the brake force distributor (12) consists of a frame-like frame (14) with two levers (15) mounted in a horizontal beam, with the lever (15) on both sides of the bearing (ΐό) to the wheel brakes leading Bowden cables (13) are connected and between the levers (15) a connecting web (17) is provided in the frame (14-) through which a Bowden cable (18) connected to the overrun brake is guided. 60980 870004
- II - 3.) Brake system according to claim 1 or 2, characterized in that the Bowden cable leading to the overrun brake (18) acts on the connecting web (17) of the frame-like frame (14) via a pretensioned compression spring (19). Dipl.-Ing.H.D.Ernicke patent attorney .60 98 08 / QQCU Blank page