Land vehicles – Wheeled – Running gear
Reexamination Certificate
2002-01-02
2004-09-21
Dickson, Paul N. (Department: 3616)
Land vehicles
Wheeled
Running gear
C280S124135
Reexamination Certificate
active
06793228
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to automotive vehicle suspension systems, and pertains more particularly, to an automotive suspension system with means that is responsive to the inertial forces on the vehicle chassis to load the download side of the suspension for limiting vehicle body roll.
2. Discussion of the Related Art
A typical automotive vehicle has a body or chassis formed with an enclosed operator and passenger compartment with the body being resiliently supported by a suspension system on wheel assemblies that carry it over generally horizontal surface road and street surfaces. An automotive vehicle may be driven through the rear wheels, the front wheels or both. It typically has steerable front wheels and non-steerable rear wheels. The suspension system normally employs springs to support the body on the wheel assemblies, and with damping means in the form of hydraulic cylinders that act to dampen oscillations and movements of the body relative to the wheel assemblies.
The construction of the suspension system is often a compromise between a soft suspension for providing a soft ride for passenger comfort over rough roads and the like and a stiff suspension, which enhances the safety and stability of the vehicle. A stiffer suspension transfers more shock of the suspension to the chassis and offers less comfort to passengers but increases the stability of the vehicle. When the typical vehicle enters a turn the resulting centrifugal forces acting on the vehicle tend to roll the vehicle body about its roll center relative to the underlying suspension system. This centrifugal force also tends to displace the body laterally, outwardly tending to cause the vehicle to pivot about the contact of its outer wheels with the road surface.
The construction of a vehicle body and the configuration of the vehicle suspension systems determine the location of the roll center. In a conventional vehicle, the roll center of the vehicle is typically below the center of mass or gravity of the vehicle. Centrifugal forces tending to roll the vehicle body act on a lever arm or through a lever arm determined by the vertical distance between the center of gravity and the roll center. This is known as the roll couple.
As a vehicle moves through a turn the body tends to roll and shift the weight onto the outer wheels and springs while simultaneously unloading the inner suspension springs thereby reducing the cornering traction of the vehicle. The body also tilts or rolls toward the outside of the curve shifting the mass of the vehicle toward the outside of the curve. The rolling of the body about its roll center when negotiating a curve is discomforting to the operator and passengers. Stiffer suspensions which tend to reduce this tendency to roll also subject the passengers and operator to the jolting and jarring of rough roads.
A number of approaches to over coming this tendency of the vehicle to roll during cornering have been proposed in the past. One approach has been to provide the vehicle with anti-sway bars in the form of torsion bars between the two sides of the suspension. This approach helps reduce roll but is not satisfactory.
Another approach has been to provide the vehicle with a linkage system powered by electric motors to selectively tilt the body inwardly during cornering. Such a system is disclosed in U.S. Patent No. 2,152,938.
Others have attempted to overcome this problem by designing the suspension system so that the roll center of the vehicle is disposed above its center of gravity. Most of these systems are complicated and expensive. These systems also have other serious drawbacks.
Others have attempted to overcome this problem by designing the suspension system so that the roll center of the vehicle is disposed above its center of its gravity. Most of these systems are complicated and expensive. These systems also have other serious drawbacks. Accordingly there is a need for an improved anti roll suspension system that over comes the above problems of the above prior art.
SUMMARY OF THE INVENTION
The present invention solves the problem of excessive vehicle body roll. Broadly, the present invention provides a suspension system having a linkage that translates lateral body movement into a lift force on the down load side of the body.
More specifically, one embodiment of the invention comprises an anti roll suspension for a vehicle chassis having at least two laterally spaced wheels, wherein the suspension comprises an axle assembly for rotatably mounting each of a pair of laterally spaced wheels, a spring assembly supporting the chassis on each of the axle assemblies, a moveable arm connected between the spring and the chassis, and an anti roll linkage connected between said chassis and the moveable arm of the axles of the suspension system being responsive to a lateral force on said chassis, and structured to translate lateral force on the chassis to a vertical force on the down force side of the chassis so that the anti roll linkage simultaneously lifts the down force side of the vehicle and lowers the up force side of the vehicle. However, the claims alone, not the preceding summary, define the invention.
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Dickson Paul N.
Draper Deanna
Gordon & Rees LLP
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