Device for roll stabilization of a motor vehicle

Details Device for roll stabilization of a motor vehicle Device for roll stabilization of a motor vehicle

1998-04-06

2000-03-21

Rice, Kenneth R.

Land vehicles

Suspension modification enacted during travel

Including condition or parameter adjustment occurring at...

280 5507, B60G 21055

Patent

active

060393262

DESCRIPTION:

BRIEF SUMMARY
The invention pertains to a device for reducing the rolling tendency of a motor vehicle with at least one axle that carries two wheels and is provided with a roll stabilizer in accordance with the preamble of claim 1, and a device for reducing the rolling tendency of a motor vehicle with at least two axles that each carry at least two wheels, in accordance with the preamble of claims 7 and 14.
Devices of the aforementioned type are known. They serve for stiffening the suspension of a motor vehicle during a one-sided spring compression and rebound at the wheels assigned to one axle and thusly prevent a torsional vibration of the motor vehicle about its longitudinal axis. Vibrations of this type are also referred to as vehicle or body roll. These known devices-include a hydraulic unit, in particular, an oscillating motor, that cooperates with two stabilizer sections in such a way as to produce mutual torsion. The torques generated in this fashion counteract the spring compression at a wheel connected to the roll stabilizer.
However, it has become apparent that an optimum functional reliability of such devices cannot be ensured at all times.
Consequently, the invention is based on the objective of developing a device of the above-mentioned type for preventing the rolling tendency of a motor vehicle which does not have these disadvantages.
The object of the invention is realized with a device that is realized in accordance with the characteristics disclosed in claim 1. The device is characterized by the fact that the hydraulic device is provided with a valve unit that includes a changeover valve as well as a safety valve that can be actuated independently of the changeover valve. The changeover valve serves for controlling the hydraulic device in such a way that opposite torques can also be introduced into the sections of the roll stabilizer in rapid sequence. The safety valve serves for switching the hydraulic device into a defined functional state if the control device assigned to the hydraulic device fails. It was determined that it is possible for the changeover valve to become jammed, e.g., due to contamination of the hydraulic fluid. Since the hydraulic device contains a changeover valve and a safety valve which operate independently of each other, a functional failure of the changeover valve cannot influence the reliability of the device for reducing the rolling tendency because a separate, independent safety valve is provided.
One preferred embodiment of the invention is characterized by the fact that the safety valve represents the last functional element in the hydraulic supply of the hydraulic device. Several functional elements are usually arranged between the hydraulic unit and the pump that supplies the hydraulic unit, e.g., devices for measuring and influencing the hydraulic flow and the pressure. Defects in one or more of these systems can lead to persistent safety risks. If the safety valve is arranged directly in front of the hydraulic device, all defects occurring between the pump and the safety valve can be bypassed.
Additional embodiments of the invention are disclosed in the remaining subordinate claims.
The object of the invention is also realized with a device for reducing the rolling tendency of a motor vehicle with at least two axles that respectively carry at least two wheels, wherein roll stabilizers and hydraulic devices are assigned to the axles. This pertains, in particular, to passenger cars that are equipped with a device of this type. The device is characterized by the fact that the hydraulic devices of both axles are provided with valve units that contain separate changeover and safety valves which operate independently. This means that the previously discussed advantages are also realized in this case.
Additional embodiments are disclosed in the remaining subordinate claims.
The object of the invention is also realized with a device for reducing the rolling tendency of a motor vehicle with at least two axles which also contains a flow divider that divides the oil flow delive

REFERENCES:
patent: 4765649 (1988-08-01), Ikemoto et al.
patent: 4834419 (1989-05-01), Kozaki et al.
patent: 5104143 (1992-04-01), Yonekawa
patent: 5547211 (1996-08-01), Runkel
patent: 5642282 (1997-06-01), Sonehara

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