Rotary joint device, method of machining rotary joint device, and main shaft driving apparatus for machine tool including rotary joint device

摘要

A rotary joint device includes attachment grooves formed at positions in an outer peripheral surface of an outer cylinder, each attachment groove being formed so as to straddle a pair of adjacent cylindrical blocks and so as to be exposed from the outer peripheral surface of the outer cylinder, each attachment groove having a bottom surface that is machined to form a flat surface in a state in which the cylindrical blocks are combined, and positioning blocks corresponding to the attachment grooves on a one-to-one basis and each having an attachment phase that is uniquely set to a corresponding one of the attachment grooves in the axial direction and in a circumferential direction of the outer cylinder, each positioning block having an attachment surface corresponding to the bottom surface of a corresponding one of the attachment grooves, the attachment surface being machined so as to form a flat surface.

主权项

1. A rotary joint device comprising:
an outer cylinder including a plurality of cylindrical blocks combined in an axial direction; a rotating shaft rotatably supported in the outer cylinder by two bearing that are disposed away from each other in the axial direction of the outer cylinder; at least one fluid channel formed in each of the cylindrical blocks of the outer cylinder, each of the fluid channels having an opening in an inner peripheral surface of a corresponding one of the cylindrical blocks; a connection groove provided so as to correspond to each of the fluid channels and formed in at least one of an inner peripheral surface of a corresponding one of the cylindrical blocks and an outer peripheral surface of the rotating shaft facing the inner peripheral surface, each of the connection grooves having an annular shape and communicating with a corresponding one of the fluid channels, the fluid channels in the outer cylinder and fluid channels formed in the rotating shaft so as to communicate with the connection grooves communicating with each other through the connection grooves; a plurality of attachment grooves formed at a plurality of positions in an outer peripheral surface of the outer cylinder, each of the attachment grooves being formed so as to straddle a pair of adjacent cylindrical blocks and so as to be exposed from the outer peripheral surface of the outer cylinder, each of the attachment grooves having a bottom surface that is machined to form a flat surface in a state in which the pair of cylindrical blocks are combined; and a plurality of positioning blocks corresponding to the plurality of attachment grooves on a one-to-one basis and each having an attachment phase that is uniquely set with respect to a corresponding one of the attachment grooves in the axial direction and in a circumferential direction of the outer cylinder, each of the positioning blocks having an attachment surface corresponding to the bottom surface of a corresponding one of the attachment grooves, the attachment surface being machined so as to form a flat surface.