Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1994-08-22
1998-07-07
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
188285, F16F 946, B60G 1126
Patent
active
057754705
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is related to a hydraulic controllable vibration absorber for an automotive vehicle.
BACKGROUND OF THE INVENTION
A known hydraulic controllable vibration absorber has a power cylinder whose interior space is subdivided by a piston that is slidable by means of a piston rod into a first power chamber and a second power chamber. The vibration absorber also has a balancing chamber that is connected or connectable to both power chambers and linked to the first power chamber through a connecting duct and to the second power chamber through a first non-return valve. Furthermore, the vibration absorber has a second non-return valve that is subjectible to the pressure existing within the second power chamber. Finally, the vibration absorber has a controllable vibration absorber valve which affords variations of the vibration absorbing force and a sensor arrangement whose output variable affords a recognition of the direction of movement of the piston.
A vibration absorber of this kind is known from the German patent application published without examination, No. 4,005,513. Sensors are provided in a first section of the piston rod in order to determine whether the prior-art vibration absorber is in the thrust phase or in the traction phase, which said sensors determine the pressure differential of the vibration absorber liquid within the two power chambers of the power cylinder and which interact with means for the generation of actuating signals which influence electrically actuatable means in the sense of a regulation of the exchange of the vibration absorber liquid between the two power chambers. In this context, the means mentioned in the first place and the electrically actuatable means are preferably arranged in a second section of the piston rod.
The complicated structure of the piston rod whose manufacture as well as assembly require a considerable expenditure and therefore has to be regarded less advantageous in the state-of-the-art vibration absorber. The mode of adjustment of the vibration absorbing force is also felt to be disadvantageous, which takes place within the piston rod and which is brought about by an interaction of a plurality of electrical as well as mechanical constructional components.
SUMMARY OF THE INVENTION
It is, therefore, the object of the present invention to provide a hydraulic vibration absorber with adjustable vibration absorption, of the kind mentioned, which features a simpler set-up and, thus, allows manufacture at low cost. In particular, the variation of the vibration absorbing force which the invention is aimed is to be rendered possible by making use of the simple design of the invention, with reliably functioning component parts.
According to the invention, this object is attained in that the sensor arrangement is inserted between the first power chamber and the balancing chamber. Owing to this provision, a favorable positioning of the sensor arrangement is outside of the piston rod and outside the piston, for example in the bottom range, laterally at the vibration absorber housing.
In one embodiment of the invention, which is especially suited both for two-tube and for one-tube vibration absorbers and in which the sensor arrangement is positioned within the piston, the sensor arrangement is actuatable by frictional engagement with the power cylinder. The direction of movement of this piston is recognized directly by a change of its position, without any pressure change having to take place.
In another solution of the object as mentioned, the sensor arrangement is positioned in the guide range of the piston rod, within the power cylinder, and is actuatable by frictional engagement with the piston rod. This positioning has the advantage of allowing the electric lines to be connected to the sensor arrangement to be routed outside the piston rod.
The sensor arrangement is constituted by a sensor element that is movable at a limited extent and that interacts with a recording device which is positioned stationarily within the piston,
REFERENCES:
patent: 4650042 (1987-03-01), Kuecht et al.
patent: 4674768 (1987-06-01), Morra
patent: 5161647 (1992-11-01), Bayer et al.
patent: 5439085 (1995-08-01), Woessner
ITT Automotive Europe GmbH
Lewis J. Gordon
Oberleitner Robert J.
Schwartz Chris
Twomey Thomas N.
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