Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Reexamination Certificate
1998-10-27
2001-07-17
Oberleitner, Robert J. (Department: 3613)
Spring devices
Vehicle
Mechanical spring and nonresilient retarder
C267S220000, C267S179000, C280S124155
Reexamination Certificate
active
06260836
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a suspension system for vehicle in the form of a shock absorber loaded therearound with a compression coil spring and more particularly to such suspension system for a vehicle adapted to alleviate a force generated by the compression coil spring and directed perpendicularly to a coil axis (referred to hereinafter as “side forces”).
2. Description of the Prior Art
Recently, high strength spring steel has been put to practical use and various improved working techniques such as special shot peening in order to obtain a light weight and compact product. Such efforts have increased design stress as well as pitch angle of a suspension coil spring. However, such improvement has often been accompanied with an apprehension that, even when the spring seat is displaced only in the coil axis (so-called parallel compression), a side force might be generated. Particularly when the shock absorber is loaded with such compression coil spring, such side force may often cause an absorber rod and an absorber tube to be jammed together and eventually may result not only in uncomfortable drive conditions, but also premature deterioration of the shock absorber.
To avoid such problems, various efforts have been made to alleviate the side force, for example, upper and/or lower sheets have been inclined or offcentered on the basis of a value obtained from various experiments or analytical research according to the finite element method.
SUMMARY OF THE INVENTION
This invention aims to solve the problem as both said experiments and said analytical research used to determine slants or eccentricities of the upper and lower sheets take to much time and do not necessarily give accurate values.
The invention is achieved by a suspension system for a vehicle which comprises a compression coil spring and a shock absorber, characterized by upper and lower sheet mounted on an absorber rod and on an absorber tube so as to be loaded with said compression coil spring disposed therebetween and being adapted for relatively rocking in a predetermined direction. With such arrangement, in response to a side force generated in the compression coil spring, both or any one of the upper and lower sheets tilt(s) in a predetermined direction or in any direction and consequently the compression coil spring can be smoothly curved and thereby avoid the absorber rod and the absorber tube being jammed together. If this manner, an adverse affection of the side force can be alleviated without demand for experiment as well as analysis to determine slant angles or eccentricities of the upper and lower sheets. The invention is further designed and arranged so that any one of said upper sheet and said lower sheet are or is adapted for relatively rocking around one axis of two axes which are substantially orthogonal to each other in order that the invention can be realiably realized. The invention is further arranged in that said one axis of two axes is or are defined by rollers, balls or substantially V-sectioned recesses and substantially V-sectioned projections. The invention is further arranged such that an angle by which said upper sheet and said lower sheet can rock relatively to each other is limited to a value less than a predetermined value. Appropriate experiments and analytical research according to the finite element method indicate that such arrangement is effective to avoid a side force which might abruptly increase when an excessively large load is applied to the compression coil spring.
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Aoyama Toshiho
Goto Takashi
Chuohatsujo Kabushiki Kaisha
King Bradley
Lackenbach Siegel Marzullo Aronson & Greenspan
Oberleitner Robert J.
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