| 摘要 |
1,033,894. Universal joints. YARSLEY RESEARCH LABORATORIES Ltd. June 10, 1963 [June 21, 1962], No. 23993/62. Heading F2U. A resilient coupling comprises driving and driven members having intercalated blades 3, 4 having the spaces between adjacent blades occupied by resilient elements each of which is formed by two or more components of different hardness to give a flexible response to a light load and a stiff response to a heavy load. As shown a soft component 7 is partially housed in grooves in hard components 6, and is under some compression in the unloaded state of the coupling. Under light loading the soft component 7 is compressed to give a flexible response until under increasing torque load flat faces on the hard components 6 contact each other, whereafter the hard components are deformed to give a stiff response. The soft component may be cylindrical and be disposed axially or radially of the coupling. Several soft components may be used disposed axially, radially or peripherally of each other, and they may be of differing hardness. The various components of an element may be permanently or temporarily interconnected as by bonding, by a flexible link or by grooves and projections. In a preferred embodiment the soft component is formed of natural rubber and the hard component of a polyether polyurethane elastomer. If the coupling components are liable to oil contamination the soft natural rubber component may be replaced by a soft butadiene-nitrile copolymer component. |
