Patent ID: 8360677

Claim:
A hydraulic detachable coupling mounted detachably on a rotating shaft of a rotating machine, comprising a coupling sleeve which is fitted on a shaft end portion of the rotating shaft, the coupling sleeve including: an interference fit portion which is interference-fitted on an outer peripheral surface of the shaft end portion by a hydraulic pressure; and an engagement portion which engages the outer peripheral surface of the shaft end portion at a plurality of locations in a circumferential direction, wherein the interference fit portion and the engagement portion are located adjacent to each other, the engagement portion is a straight hole portion having teeth formed therein, the teeth engaging teeth formed in a straight shaft portion of the shaft end portion, the teeth of the engagement portion, except for one of the teeth of the engagement portion, engage a plurality of the teeth of the shaft end portion via taper spacers disposed on both sides of other of the teeth of the engagement portion, wherein the one of the teeth of the engagement portion engages with one of the teeth of the shaft end portion without using the taper spacers and without having any clearance.