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US 4,105,266 AGranted
Laminated bearing with plural modulus layer
AssigneeLord Corporation
InventorRobert H. Finney
Life of this patent
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AssigneeLord Corporation
InventorRobert H. Finney
Estimating the term…
A laminated bearing comprises a plurality of alternating and bonded together annular layers of elastomeric material and non-extensible material. The layers alternate along a common axis extending lengthwise of the bearing so that the bearing can support substantial compressive loads applied generally normal to the layers. The layers include at least one elastomeric layer which, if formed to have a nominally constant modulus of elasticity throughout and if subjected to a compressive load, would experience a shear strain adjacent one of its inner and outer circumferences greater than the shear strain adjacent the other circumference. Such a difference in compression-induced shear strains would tend to cause uneven wearing of and a reduced service life for the elastomeric layer in question and for the bearing as a whole. To avoid or minimize uneven wear, the elastomeric layer is formed to have at least two different moduli of elasticity. The nominal modulus of the layer is higher or highest adjacent the circumference of the layer which tends to experience the higher compression-induced shear strain. As a result, the ratio between the shear strains adjacent the two circumferences of the layer is less than what it would be if the layer had a nominally constant modulus of elasticity throughout.
In a laminated bearing comprising a plurality of alternating and bonded together layers of elastomeric material and substantially nonextensible material, said layers alternating along a common axis extending lengthwise of the bearing so as to permit the bearing to support compressive loads applied generally normal to the layers and to accommodate torsional loads applied about the common axis, each layer being annular and having with respect to the common axis a radially inner circumference and a radially outer circumference, the layers including at least one layer of elastomeric material which if formed to have a nominally constant modulus of elasticity throughout and if subjected to a predetermined compressive load applied generally normal to the layer would experience a greater shear strain adjacent one of its inner and outer circumferences than adjacent the other of its inner and outer circumferences,
In a laminated bearing comprising a plurality of alternating and bonded together layers of elastomeric material and substantially nonextensible material, said layers alternating along a common axis extending lengthwise of the bearing so as to permit the bearing to support compressive loads applied generally normal to the layers and to accommodate torsional loads applied about the common axis, each layer being annular and having with respect to the common axis a radially inner and a radially outer circumference,
In a laminated bearing comprising a plurality of alternating and bonded together layers of elastomeric material and substantially nonextensible material, said layers alternating along a common axis extending lengthwise of the bearing so as to permit the bearing to support compressive loads applied generally normal to the layers and to accommodate torsional loads applied about the common axis, each layer being annular and having a radially inner circumference and a radially outer circumference with respect to the common axis,
Dependencies are inferred from the claim text.