Patent ID: 7549926

Claim:
A rubber element for a compression elastic coupling including a drive flange provided with a plurality of drive ribs circumferentially arranged at angular intervals and a driven flange coaxial with and spaced from the drive flange and provided with a plurality of driven ribs circumferentially arranged at angular intervals, the rubber element being adapted to be interposed between the drive rib and the driven rib so as to be compressed when power is transmitted, comprising: a pair of mounting plates attached respectively to a pair of rib surfaces of the drive rib and the driven rib which are circumferentially spaced and opposed to each other; and an elastic member made of rubber, the elastic member being held between the pair of mounting plates which are spaced and opposed to each other, the elastic member being bonded to joining surfaces of the pair of mounting plates; wherein the pair of mounting plates are respectively provided with protrusions protruding toward each other in central areas of the joining surfaces or lateral areas of the joining surfaces including the central areas, the lateral areas of the joining surfaces extending in a direction parallel to an axis about which the flanges rotate, wherein the elastic member includes a circumferential outer surface which is exposed between the pair of mounting plates, the circumferential outer surface being formed to be bulged outward near the pair of mounting plates and depressed at a middle part of the circumferential outer surface.