Spring devices – Rubber
Patent
1992-09-23
1993-09-21
Oberleitner, Robert J.
Spring devices
Rubber
267145, 267292, 248621, 248638, F16F 136
Patent
active
052462145
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a shock absorbing rubber block.
BACKGROUND ART
A rubber body is known from the German Gebrauchsmuster DE 85 35 344 U1, wherein a block is crossed by cylindrical or prismatic ducts which pass through cavities formed inside the block. The largest inside cross-section of these cavities when seen perpendicularly to the axis of the ducts crossing it is larger than the duct cross-section in this plane. The duct axes are located at the centers of the essentially and at least approximately spherical cavities. The cavities and the ducts are arranged in such a way that at least two spatially crossing, though not intersecting, sets of mutually parallel ducts cross this block.
This known rubber block serves as a rest or thrust bearing, the grid planes formed by the cavities and ducts being transverse, in particular perpendicular to the vector of a load which must have shock-absorption.
Rubber blocks of this kind are characterized by a great depth of penetration, that is by an extremely compliant spring characteristic line, with high mechanical strength and extensive, and in practice as a rule complete acoustic de-coupling between the rest and its own base.
While such a rubber body may be considered nearly ideal with respect to spring and acoustic characteristics, design limits nevertheless are set on it on account of the required array of grid planes formed by the cavities and ducts perpendicularly to the load vector.
SUMMARY OF THE INVENTION
The object of the invention is to so improve a rubber body or block such that a rubber spring also may serve in those elastic problems where the load vector may not be axial and perpendicular to the grid planes of at least two spatially crossing though not intersecting sets of mutually parallel ducts.
This problem is solved by the invention by a rubber block comprising a block shaped to include at least a segment of a circular washer having at least one load bearing surface disposed at at least one end of the segment. A plurality of hollow ducts are regularly distributed in the block and essentially all of which ducts in the block are mutually parallel to each other and essentially perpendicular to a main plane of the block. The main plane is essentially perpendicular to said at least one bearing surface. The hollow ducts intersect cavities regularly distributed through the block. The cavities have a cross-sectional area in a direction perpendicular to the longitudinal axis of the associated duct which is larger than the corresponding cross-sectional area of the hollow ducts intersecting said cavities.
The hollow ducts are circumferentially spaced from each other and arrayed along imaginary concentric circular segments.
A spring body of this kind may be loaded circumferentially or peripherally, in other words it is applicable wherever torsional elasticity must be provided. Surprisingly, the rubber block of the invention evinces the same properties of high mechanical strength in the presence of a compliant spring characteristic line and nearly perfect acoustic de-coupling as do the known, axially loaded grid rubber or spring block. The characterization of "compliant" or the feature of "great depth of penetration" refers to the torsion angle.
The cavities may be shaped as spheres arrayed inside the block in a spatially regular manner and staggered relative to one another as a spaced center grid wearing to the outside. Each hollow duct may cross at least three cavities. At least one load-bearing surface may also define at least one radially extending mounting surface extending toward the main axis of the block. A rigid, load-absorbing plate may be located adjacent the said mounting surface.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a top view of one of the two surfaces in the main radial plane of the rubber block, and
FIG. 2 is an axial section through an alternate embodiment of a rubber block having an axial cross-section of the block depicted in FIG. 1 and taken through a main radial plane.
BEST MODE FOR CARRYING OUT THE INVENTIO
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Pletsch Hubert
Wolf Franz J.
Ballato Josie A.
Oberleitner Robert J.
WOCO Franz-Josef Wolf & Co.
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