Spring devices – Vehicle – Lever and nontorsion spring
Patent
1988-04-22
1990-01-23
Oberleitner, Robert J.
Spring devices
Vehicle
Lever and nontorsion spring
248613, 267153, 267168, F16F 136, F16F 106, F16M 1300
Patent
active
048953555
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a spring device and more particularly, to a spring device having an abrupt steep rise within the linear range of its force deflection curve.
Normally it is not a great problem to softly dissipate small masses. However, the soft dissipation of greater masses is troublesome, so that compromises have to be found. As a result the desired soft dissipation of greater masses cannot be readily. The problem arises that the coupling of greater masses to soft spring devices lads, even in the case of small accelerations, to critically long linear deflections causing critical accelerations during the negative deflection. As an example, it is desirable in the car construction art that the engine of a car be mounted as softly as possible. When mountings having the desired soft spring characteristics are amplitudes of the motor block result even if the street is not very rough. Thus serious problems arise with respect to the power transmission from the engine to the wheels. In addition, the driving comfort is adversely influenced. Under certain circumstances this also affects the stability of the car while driving. Due to that behaviour, the engines of cars have been mounted harder. The same holds true for numerous other problems in the art of mountings with respect to the supporting mounting as well as with the suspension mounting. Such problems arise for instance when mounting fixed oscillating engines, when mounting measuring devices and measuring tables and when mounting complete industrial buildings.
SUMMARY OF THE INVENTION
In view of the problems in the art mentioned above, it is an object of the present invention to develop a spring device which can to softly dissipate greater masses, and in particular strong acting forces whereby the total extension of the spring, i.e. the total linear deflection, is substantially shorter than the linear deflection required for the effective soft dissipation of the acting forces or the mass to be dissipated.
The above object is solved according to the present invention by a spring device having an abrupt steep rise within the linear range of its force deflection curve.
In particular, the object of the present invention is achieved by the fact that the linear range of the force deflection curve, which is the effective range thereof, is divided into two subranges which are set-off in a parallel manner with respect to each other. Consequently, the energy, which is introduced into the spring device or the spring device system by the spring mounted accelerated mass (or the spring mounted accelerated load to be spring mounted), is dissipated softly or at least substantially in a linear fashion at the beginning and during the end phase of the spring deflection. However, the substantial part, and very often the main part of the energy introduced into the system is rigidly dissipated in the middle range of the spring deflection or the middle range of the linear deflection, respectively. Depending upon the particular situation and the requirements of each case, the three ranges can be quantitatively arranged or distributed in various ways. Preferably about 30 to 70%, and in particular 40 to 60% of the total energy which is introduced into the spring device during one load is dissipated rigidly and that rigid dissipation constitutes not more than 20%, preferably 1 to 10%, of the total linear deflection required. However, about 1 to 10% of the total energy introduced into the spring system is dissipated during the initial phase of the spring deflection, i.e. at the beginning of the linear deflection, within the linear range of the force deflection curve.
In the case of weak damping spring the force deflection curve within the negative deflection range is substantially the same as the force deflection curve of the spring during the initial load. This is also valid for a pressure spring within the range of the extension of the spring body and for a tension spring within the range of the contraction of the spring exceeding the origin.
Thi
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Pletsch Hubert
Wolf Franz Josef
Oberleitner Robert J.
WOCO Franz-Josef Wolf & Co.
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