Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Patent
1999-04-26
2000-04-25
Butler, Douglas C.
Spring devices
Vehicle
Mechanical spring and nonresilient retarder
1882661, 188 111E, B60G 17027, B60G 17015
Patent
active
060534885
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This application claims the priority of German application 196 06 990.4 and PCT/EP97/00796, filed Feb. 24, 1996 and Feb. 20, 1997, respectively, the disclosure of which are expressly incorporated by reference herein.
The present invention relates to a spring damper between a wheel and a motor vehicle body which includes a damper cylinder and a piston rod co-operating with the latter and is directly articulated between the body of the vehicle and a guide element of the wheel, the spring is tensioned between a body-side and a wheel-side abutment, the clearance between the abutments can be varied by a hydraulic adjusting device and in which measuring devices operating without contact are provided to determine the installed length of the damper as well as the clearance of the abutment for the spring.
GB 2 288 577 A shows a shock absorber and spring disposed side by side, extending parallel to one another. The nature of the measuring device is not described.
DE 35 02 579 A discloses a spring damper device of coaxial construction, having a device for adjusting the clearance of the abutments of the spring. Clearance measuring devices are not provided therein.
DE 42 44 204 A describes a shock absorber in which hydraulic fluid is displaceable by a displacement body from a damping cylinder via a throttle against an air cushion. The initial position of the displacement body in the damping cylinder, and thus the clearance between the articulations at the body and the guide of a wheel can be varied by a separately possible variation of the hydraulic fluid flow within the damping cylinder.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a spring damping device which, having a simple construction, also has a small dimension perpendicular to the stroke direction and can operate with clearance measuring devices which are likewise of simple construction and can be accommodated in space-saving fashion.
This object has been achieved by providing a spring damper device in which device having the damper and the spring extend coaxially, the hydraulic adjusting device comprises a cylindrical housing which engages with annular clearance around the piston rod and is sealed and guided radially at the axial ends relative to this piston rod, the housing being displaceable relative to the piston rod by hydraulic pressure acting on the annular space, the measuring devices comprise a position transmitter, one of which is fitted to the damping cylinder and one to the adjusting device, a sensor fixedly connected to the piston rod being assigned to each position transmitter, the sensors are situated in a common tubular holder.
In accordance with the present invention, the sensors of the clearance measuring device are disposed, in a simple and reliably mounted manner in design terms to lie one behind the other in a common tubular holder. This tubular holder can be disposed parallel to the piston rod of the vibration damper or may also be integrated into the piston rod, in that the piston rod itself forms the holder.
According to the present invention, the piston rod is advantageously integrated into a hydraulic assembly to vary the clearance between the body element and the guide element of a wheel of a motor vehicle. The installed length of the vibration damper is altered by this hydraulic assembly, in that the piston rod is inserted more or less deeply into the damping cylinder and oscillates relative to this adjustable position during travel. A common evaluation of the distance measuring systems set up according to the invention allows the respective clearance between the articulations of the vibration damper on the vehicle body on the one hand and the guide element of an assigned wheel on the other hand to be determined unambiguously by way which are simple in terms of design and function, and specifically even when the piston rod is oscillating, over the entire progression of the oscillation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross-section view through
REFERENCES:
patent: 5009450 (1991-04-01), Herberg et al.
patent: 5810335 (1998-09-01), Wirtz et al.
Forsbach Michael
Fritz Peter
Luncz Helmut
Wirtz Joachim
Butler Douglas C.
Daimler-Chrysler AG
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