Land vehicles – Wheeled – Running gear
Patent
1994-11-04
1998-02-10
Young, Lee W.
Land vehicles
Wheeled
Running gear
280726, B60G 1114
Patent
active
057160678
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a. Field of the Invention
The invention relates to a mass spring system for use in a vehicle, in which the sprung mass is connected to a support by means of a bearing arm and a spring leg. The mass spring system is equipped with an anti-roll/pitch mechanism comprising an auxiliary spring, of which one end is connected to the support and the other end to the bearing arm. The axis of the auxiliary spring can be moved by moving one of the two ends of the auxiliary spring, for exerting on the bearing arm a countermoment corresponding to the load acting on the support.
b. Related Art
An example of such a mass spring system is a wheel suspension system such as that known from German Patent document DE-A-3,707,085. Variable reaction forces are exerted on the wheel suspension system during braking or acceleration of a vehicle and when negotiating bends, which leads to rolling or pitching movements of the vehicle. These rolling and pitching movements of the vehicle have an adverse effect on the ride, the steering and the safety of the vehicle. It is therefore desirable to counteract such rolling and pitching movements. The stabilisation system for counteracting said rolling and pitching movements, as known from the above-mentioned German Patent document DE-A-3,707,085, has the drawback that the auxiliary spring is compressed or extended on movement of the axis. Therefore, in the countermoment to be supplied by the auxiliary spring not only the moment arm, but also the force component supplied by the auxiliary spring changes, with the result that the control system for stabilizing the rolling and pitching movements becomes more complex. Movement of the axis of the auxiliary spring in a direction in which the spring is compressed further also requires power, which must supplied in one way or another. The object of the present invention is to provide an anti-roll/pitch mechanism forming part of the wheel suspension system and requiring a minimum of power, in which the control for supplying the desired counter-moment can be simplified.
SUMMARY OF THE INVENTION
This object is achieved according to the present invention by a mass spring system of the above-described type in which the movable end of the auxiliary spring can pass through a circular path, lying on the surface of a sphere, while the fixed end of the auxiliary spring lies in the center point of the sphere. The auxiliary spring can be movable in a flat plane or can pass through the generated surface of a cone.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the mass spring system according to the present invention are explained in greater detail with reference to the drawing, in which:
FIG. 1 shows the basic principle of a wheel suspension system according to the present invention;
FIG. 2 shows two variants of the wheel suspension system: a circle mechanism and a cone mechanism, in which one end of the auxiliary spring is immovably connected to the chassis of the vehicle;
FIG. 3 shows the circle mechanism according to FIG. 2, in a constructionally developed form;
FIG. 4 shows a first embodiment of the cone mechanism;
FIG. 5 shows a second embodiment of the cone mechanism;
FIG. 6 shows a variant of the wheel suspension system according to the invention, in which the spring of the spring leg also fulfils the function of auxiliary spring; and
FIG. 7 shows the mass spring system according to FIG. 6 used on a vehicle cab.
DETAILED DESCRIPTION
The basic principle of the present invention is shown in FIG. 1. The wheel 1 is connected to a bearing arm in the form of a linkage triangle 2, of which only one rod is shown. The linkage triangle 2 is hingedly connected at the hinge point 3 to the chassis 4, while the wheel 1 is connected to a hinge point 5 lying in the vertex of the linkage triangle 2. The spring leg 6 acts upon the wheel 1. The spring leg essentially comprises a spring 7 and a shock absorber 8, and is hingedly connected to the chassis 4 at the hinge point 9. The wheel suspension system is of the known MacPherson type.
REFERENCES:
patent: 3858902 (1975-01-01), Howells et al.
patent: 5098116 (1992-03-01), Edahiro et al.
Pacejka Hans Bastiaan
van der Knaap Albertus Clemens Maria
Michaelson Peter L.
Pokotylo John C.
Technische Universteit Delft
Young Lee W.
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