CS225989B1 - Circuitry for regulating pressure force distribution in four-wheel mobile vehicles - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to the regulation of the distribution of compressive forces on individual axles in dual-axle air suspension vehicles.

At present, the distribution of the compressive forces on the individual axles of the double axle is solved by different sizes of the supporting spring elements of the individual axles of the double axles or by their different kinematic coupling with the axle while maintaining the same pressures in the supporting spring elements of the driven and non-driven axles;

However, these structures maintain a constant ratio of distribution of compressive forces to the individual axles, regardless of the vehicle load. In order to achieve the greatest possible adhesion forces on the driven axle, the ratio of the compressive force on the driven axle to the compressive force on the non-driven axle is selected as high as possible. This ratio is limited to the maximum permissible load per axle. The ratio of the distribution of the compressive forces to the individual axles remains constant even at partial loads of the vehicle, where a larger and more proportional ratio would be possible from a regulatory point of view, ie greater compressive forces on the driven axle and lesser compressive forces on the non-driven axle.

This disadvantage is overcome by the solution according to the invention, characterized in that a differential valve is inserted between the air pressure source and the spring element into the supply line of the spring elements of the non-driven axle of the double axle. connected pneumatic

225 989

225 989 relief device.

Examples of embodiments of the invention are shown in Figs. 1 and 2, wherein Fig. 1 shows schematically a circuit with one differential valve and Fig. 2 shows a schematically symmetrical circuit with two differential valves.

As can be seen from the accompanying figures, the air spring elements 2, 2 'of the driven axle of the double axle are connected via a pipe 2, 2' to a non-depicted compressed air source via non-depicted positioning valves. The pressurized air from the positioning valves is further guided (see the alternative according to FIG. 2) to the differential valves 4, 4 'where their pressure is reduced to selected values and the air at this reduced pressure is led through the outlet ducts χ, χ * of the differential valves 4, 4 into the air spring elements 6, 6 'of the non-driven axle. The air pressure reduction for the air spring elements 6, 6 'of the non-driven axle ee is carried out in the differential valves 4, 4 by means of air of reference pressure which is supplied to the differential valve 4 via a reference pressure line 1 from an unrefined reference pressure source. A pneumatic relief device 7 can be connected to the reference pressure line 1, which lifts the non-driven axle against the air spring element 6, 6 'of the non-driven axle so as to assist in relieving it or, . The reference pressure value is equal to or proportional (depending on the differential valve version 6) of the differential pressure values of the driven axle air spring 2 and the non-driven axle air spring element 6, and this value can optionally be set by the driver according to vehicle load, either permanently or shortly. for example, to increase the adhesion of the driven axle wheels when overcoming a slippery road section.

FIG. 2 shows an exemplary embodiment with two differential valves 6, 6 ', each connected between a driven axle air spring element 22 and a non-driven axle air spring element 6 on the same side of the vehicle. The air spring elements 6, 6 ' of the non-driven axles are then not connected to each other and the air spring elements 2 ' This design provides greater transverse stability.

The circuit according to the invention works as follows:

Depending on the load of the vehicle, the air pressure is set by the positioning valve (not shown) and is fed via line 2 to the air suspension elements 2 * 2 * of the driven axle of the vehicle double axle, thereby adjusting the desired axle distance to the vehicle frame. At the same time, the reduced pressure air outlet pipe 8 of the reduced pressure air is supplied to the air spring elements 6, 6 'of the non-driven axle. The difference in air pressures in the air suspension elements 2, 2 'of the driven axle and the air suspension elements 6, 6' of the non-driven axle of the vehicle is determined by the reference pressure controlling the differential valve.

4. Reference pressure magnitude It is adjustable within certain limits by the driver, who may therefore choose to vary the pressure of the axles on the road within certain limits.

Claims (2)

1. Wiring for regulating the distribution of pressure ail of two-axle vehicles, especially motor vehicles with air suspension elements on each axle of a twin axle, the driven axle air suspension elements being connected to the reservoir via the positioning regulators and non-driven axle air suspension elements connected to an air pressure source, characterized in that a differential valve (4, 4 ') is connected between the air pressure source and the spring element (6, 6') to the supply line of the spring elements (6, 6 ') of the non-driven axle. 1) reference pressure to the reference pressure source. Connection for regulating the distribution of the compressive forces of a two-axle motor vehicle according to claim 1, characterized in that a pneumatic relief device (7) is connected to the reference pressure line (1).