Ring for a hydrostatic or hydrodynamic bearing, a hydraulic machine equipped with such a ring, and a method of mounting such a ring on a shaft

A ring designed to be clamped around a shaft of a hydraulic machine for the purpose of forming a portion of a hydrostatic or hydrodynamic bearing, the ring comprising;

• at least a first segment and at least a second segment, and the first and second segments being mounted around a shaft;
• each of the first and second segments having a radially outer surface, a radially inner surface, and two end faces interconnecting the radially outer and inner surfaces;
• the first segment being provided with at least one tapped hole in a first of the end faces thereof and adapted to receive at least one screw projecting from an end face of the second segment which is aligned with the first end face of the first segment;
• the at least one screw having a shank that projects outward relative to the aligned end face of the second segment and the shank having at least one piece in relief for use for driving the shank in rotation about a longitudinal axis of the shank in order to screw the at least one screw into the tapped hole or in order to unscrew the at least one screw from the tapped hole;
• the at least one screw including a piston slidably mounted in a recess that is provided in the second segment, which recess opens out in the aligned end face of the second segment, and is isolated from the outside by a bearing through which the shank of the at least one screw can slide;
• and
• the second segment having feed means for feeding pressurized fluid to a chamber of variable volume formed between the piston and the bearing inside the recess.