Abstract: Flexible shaft coupling for transmission of high torque loads comprising drive side and driven side connecting elements arranged in pairs alternately and equidistantly in a circumferential orientation, endless belts of fiber cord bundles wrapping around and interlinking pairs of adjacent drive side and driven side connecting elements, and an elastomeric material embedding therein the foregoing members. Between the connecting elements and the belts there are mounted bobbin-like collars each having both terminal flanges defining a hollow of U-shaped cross-section between them, and the belts are received and held in the hollows. By the construction, disorder or relaxing in cords is not caused and loads are dispersed uniformly on the cords with the result that high torque transmission efficiency is attained.

Abstract: A flexible shaft coupling comprising drive side connecting elements and driven side connecting elements arranged alternately and equidistantly in an annular orientation, and coupling pieces of annular form linking mutually adjacent pairs of drive side connecting elements and driven side connecting elements, each of both connecting elements being formed of an inner sleeve, an outer sleeve and an elastic intermediate member bonding them, the coupling pieces being formed of a belt strip wrapping around the outer sleeve and an elastomeric body surrounding and covering the wrapped belt strip. The elastic intermediate member is formed as a rubber bushing press-fitted between the inner and outer sleeves and extends only in an axially middle portion of both sleeves, and adjacent to the rubber bushing, intermediate sleeves are fitted to the inner sleeve or outer sleeve. The elastic intermediate member has a compressive strain of 25-40%.