Patent ID: 7083521

Claim:
A mounting structure of a shaft to be tested on a balancer comprising: a flexible coupling provided at an end portion of the shaft to be tested; a plurality of bolts mounting the flexible coupling to a mounting surface plate of the balancer; and a centering shaft provided on a center axis of the mounting surface plate which is adapted to be fitted to a bearing provided on a center axis of the flexible coupling, the flexible coupling and the mounting surface plate being faucet connected at at least two of a plurality of bolt mounting portions provided at a plurality of positions in a circumferential direction of the flexible coupling, the faucet connections comprising differing first and second faucet type connections, the first faucet type connection comprises a single taper bolt inserted to a collar disposed at one of the bolt mounting portions in the flexible coupling and engaging the taper bolt with the mounting surface plate, a taper surface of the taper bolt co-acting with the connecting collar and the mounting surface plate so as to determine and fixedly position a driven side of the flexible coupling with respect to the mounting surface plate, the second faucet type connection comprises at least one collar disposed at another of the bolt mounting portions in the flexible coupling fitted to the mounting surface plate, a bolt being inserted to the collar and engaging the mounting surface plate, the second faucet type connection being arranged and constructed to fixedly position the driven side of the flexible coupling with respect to the mounting surface plate in a relative position determined by the first faucet type connection, wherein the relative position of the driven side of the flexible coupling with respect to the mounting surface plate is determined by the first faucet type connection, and this relative position is further secured by the second faucet type connection.