A hydraulic coupling device includes an inner sleeve having a tapered outer surface, an outer sleeve having a tapered inner surface mounted on the tapered outer surface of the inner sleeve, a nut screwed onto the inner sleeve and a cylinder formed separately from the outer sleeve and secured to the outer sleeve. At least a portion of the nut extends into the cylinder, and the inner sleeve, the cylinder, the nut and the outer sleeve together delimit a chamber.

A hydraulic coupling device includes an inner sleeve having a tapered outer surface, an outer sleeve having a tapered inner surface mounted on the tapered outer surface of the inner sleeve, a nut screwed onto the inner sleeve and a cylinder formed separately from the outer sleeve and secured to the outer sleeve. At least a portion of the nut extends into the cylinder, and the inner sleeve, the cylinder, the nut and the outer sleeve together delimit a chamber.

Rolling stand for oblong metal products comprising a plurality of rolling rolls (11) each installed on a respective rotation shaft (12). Between at least one rotation shaft (12) and the respective rolling roll (11), a coupling member (15) is provided and is configured to couple the rolling roll (11) and the rotation shaft (12) to each other. The coupling member (15) comprises a tubular body (16) interposed between the rolling roll (11) and the rotation shaft (12) and provided with a chamber (17) in which a deformer element (18) is inserted mobile.

A bearing assembly (12) for a rotating element (13) has one race (15) adapted to be fixed relative to ground (11) and to selectively be free for arcuate movement relative to ground. In a preferred embodiment a selective locking device (18) is provided for the relatively fixed/movable race (15).

Rolling stand for oblong metal products comprising a plurality of rolling rolls (11) each installed on a respective rotation shaft (12), between at least one rotation shaft (12) and the respective rolling roll (11). A coupling member (15) is provided and is configured to couple the rolling roll (11) and the rotation shaft (12) to each other. The coupling member (15) comprises a tubular body (16) interposed between the rolling roll (11) and the rotation shaft (12) and provided with a chamber (17) in which a deformer element (18) is inserted mobile.

A keyless timing gear assembly for securing a bull gear to a crankshaft of a power end of a reciprocating pump assembly, the keyless timing gear assembly including at least one actuator, an expansion member and at least one wedge member disposed between the at least one actuator and the expansion member, the wedge member having a sloped surface to slideably engage a corresponding sloped surface on the expansion member such that, in response to actuation of the at least one actuator, the at least one wedge member exerts a force on the expansion member for securing a bull gear to a crankshaft.

A bearing assembly (12) for a rotating element (13) has one race (15) adapted to be fixed relative to ground (11) and to selectively be free for arcuate movement relative to ground. A selective locking device (18) can be provided for the relatively fixed/movable race (15).

A hydraulic coupling device includes an inner sleeve having a tapered outer surface, an outer sleeve having a tapered inner surface mounted on the tapered outer surface of the inner sleeve, a nut screwed onto the inner sleeve and a cylinder formed separately from the outer sleeve and secured to the outer sleeve. At least a portion of the nut extends into the cylinder, and the inner sleeve, the cylinder, the nut and the outer sleeve together delimit a chamber.

A hydraulic coupling device includes an inner sleeve having a tapered outer surface, an outer sleeve having a tapered inner surface mounted on the tapered outer surface of the inner sleeve, a nut screwed onto the inner sleeve and a cylinder formed separately from the outer sleeve and secured to the outer sleeve. At least a portion of the nut extends into the cylinder, and the inner sleeve, the cylinder, the nut and the outer sleeve together delimit a chamber.