| 摘要 |
PURPOSE:To eliminate complicated distribution of a stress over a fastened portion of an FRP spring plate, and to eliminate a deterioration of the strength of the spring plate around a center hole therein by reducing the thickness of a central portion of that range of the spring plate which is fastened by a fastening means in the direction of the thickness of the spring plate. CONSTITUTION:Each of spring plate 1a, 1b has recesses 4 around a central portion 3 thereof and is reduced in the thickness at its central portion 3. Thus, a fastening force by a fastening means 7 is applied to the spring plates 1a, 1b through thicker portions around the recesses 4. Accordingly, the stress around the central portion 3 is prevented from presenting a complicated distribution thereof, and an excessive stress concentration is prevented from appearing along a circumferential portion of each spring plate around a center hole 2 therein, whereby the durability of the spring plates 1a, 1b can be improved. Besides, if a plate such as a plastics plate or a rubber plate is interposed between both FRP spring plates at their fastening portions, surface pressure by fastening can be made more uniform. |
