| 摘要 |
696,055. Resilient mountings. M.B. MANUFACTURING CO., Inc. Aug. 8, 1947 [Dec. 12, 1945], No. 22117/47. Class 108 (iii). A vibration isolator unit comprises two oppositely - disposed rigid members, in combination with rubber or like resilient cushioning means therebetween, the cushioning means in each of three mutually perpendicular directions lying between the rigid members being partly in shear orientation and partly in compression or tension orientation, the sum of the stiffnesses of the cushioning means in the different orientations in one of the three directions being equal to the sum of the stiffnesses in each of the other directions, whereby the unit has substantially equal spring rates in all directions. In the arrangement according to Fig. 1, the unit comprises an outer flanged tube 1, an inner flanged tube 2 and an interposed flanged member 5 of resilient material. In another arrangement, Fig. 3, the unit comprises oppositely disposed elements each comprising annular members 10 and 12 spaced apart by a resilient member 14. The relative proportions of the member 14 are such that respective areas of revolution generated by the dotted lines a, a and b, b about the axis of the unit, are substantially equal. The elements may be secured together by a suitable ring or bracket 16 by which the unit may be secured to one of a pair of supported and supporting members. A spacing tube 11 is inserted between the members 12 of the unit to limit inward movement thereof and the initial compression of the members 14 when the unit is secured to the other of the pair of supported and supporting members, by means of a bolt passing through the tube. Applications of both embodiments to the mounting of internalcombustion engines, are described. The Specification includes formulae by which stiffnesses and dimensions of the resilient members may be calculated in order to obtain equal stiffness on each of three mutually perpendicular directions. The resilient member may be bonded to the rigid members in each case. |
