An apparatus for damping an actuator includes an inerter. The inerter includes a first terminal and a second terminal movable relative to one another and configured to be mutually exclusively coupled to a support structure and a movable device actuated by an actuator. The inerter further includes a threaded shaft coupled to and movable along the inerter axis with one of the first terminal and the second terminal. The inerter additionally includes a flywheel rotatable in proportion to movement of the threaded shaft in response to axial acceleration of the first terminal relative to the second terminal during actuation of the movable device by the actuator. The inerter reduces actuator-load-oscillatory amplitude at resonance of the actuator and movable device relative to the actuator-load-oscillatory amplitude that would otherwise occur using the same actuator without an inerter.

A hydraulic cylinder includes: a cylinder tube; a piston; a piston rod; a pair of end covers; and a snubbing mechanism configured to reduce the moving speed of the piston after the piston reaches the vicinity of the end of its stroke. The snubbing mechanism includes: a supply/discharge port formed in an associated one of the end covers; a valve configured to open and close the supply/discharge port; a connector configured to connect the valve and the piston together; and at least one recess extending from the edge of the supply/discharge port. When the piston approaches the end of its stroke, the valve closes the supply/discharge port to form a throttle oil passage, and hydraulic oil is discharged through the throttle oil passage to reduce the moving speed of the piston.

A hydraulic assembly includes a barrel having a head port disposed proximate an end of the barrel, a piston assembly disposed within the barrel and movable relative thereto, the piston assembly including a bore terminating at a back wall, the bore defining a longitudinal axis, and a plunger at least partially received within the bore and translatable along the longitudinal axis. The plunger includes a main body having an end facing the head port, a shoulder extending radially-outwardly from the main body, and a passageway extending through the main body. A spring is disposed in a first region defined between the shoulder and the back wall, the spring configured to exert a biasing force on the shoulder.

An apparatus for damping an actuator includes an inerter. The inerter includes a first terminal and a second terminal movable relative to one another and configured to be mutually exclusively coupled to a support structure and a movable device actuated by an actuator. The inerter further includes a threaded shaft coupled to and movable along the inerter axis with one of the first terminal and the second terminal. The inerter additionally includes a flywheel rotatable in proportion to movement of the threaded shaft in response to axial acceleration of the first terminal relative to the second terminal during actuation of the movable device by the actuator. The inerter reduces actuator-load-oscillatory amplitude at resonance of the actuator and movable device relative to the actuator-load-oscillatory amplitude that would otherwise occur using the same actuator without an inerter.

In an interior of a cylinder tube of a fluid pressure cylinder, a piston unit is provided, which is displaced along an axial direction under the supply of a pressure fluid. The piston unit includes a disk shaped plate body, which is connected to one end of a piston rod, and a ring body connected to an outer edge portion of the plate body. The plate body is connected to the piston rod by plural second rivets, which are punched in an axial direction with respect to the piston rod.

An apparatus for damping an actuator includes an inerter. The inerter includes a first terminal and a second terminal movable relative to one another along an inerter axis and configured to be mutually exclusively coupled to a support structure and a movable device actuated by an actuator. The inerter further includes a rod coupled to and movable with the first terminal and a threaded shaft coupled to and movable with the second terminal. The inerter further includes a flywheel having a flywheel annulus coupled to one of the rod and the threaded shaft. The flywheel is configured to rotate in proportion to axial acceleration of the rod relative to the threaded shaft in correspondence with actuation of the movable device by the actuator.

In an automotive automatic transmission, a force applying piston mounted on a servo pin is supported at both sides of the piston. A first end of the servo pin is conventionally supported in a servo pin bore. A second, extended end is supported in a specially configured support bore formed in the assembly cover. Excentric loading and excessive wear of the servo pin and servo pin bore, which can result in damage to the piston, is reduced or eliminated thereby.

A hydraulic driving device for a steam valve includes a plurality of hydraulic actuators to generate driving force to be transmitted to the valve body through a valve shaft of the steam valve. The hydraulic actuators each include a cylinder, a piston that is capable of reciprocating in the cylinder, and a rod having respective ends connected to the piston and valve shaft. The hydraulic actuators include a main actuator including a throttle portion for regulating a flow of pressure oil in a hydraulic chamber defined by the cylinder and piston so that a damping force is applied to the valve body during its closing operation. The one or more hydraulic actuators other than the main actuator include at least one sub actuator not having the throttle portion. The hydraulic chamber of the sub actuator communicates with the hydraulic chamber of the main actuator.

An actuator includes a ram structure slidably mounted within a cylinder structure bore and defines with the cylinder structure a gap therebetween. A fluid passageway structure in the ram structure defines a path for fluid to flow through the ram structure and includes an outlet in a sidewall of the ram structure. A cushioning seal located between the ram structure and the cylinder structure can engage the ram structure and a cylinder cap during ram structure extension such that the seal substantially closes off a first portion of the gap extending from the seal toward an open end of the cylinder structure. The cushioning seal can move during ram structure retraction in a direction of ram structure retraction such that fluid flowing out of the ram structure sidewall outlet, when the outlet is in the gap first portion, flows between the seal and the cylinder cap.

A linear actuator provided for moving a load includes an actuator housing having a tube and a housing bottom at one end of the tube and a housing head at another end of the tube. The linear actuator further includes a piston guided longitudinally in the actuator housing, and an actuator rod assembled with the piston and configured to protrude out of the actuator housing in a manner which is guided in the housing head. The linear actuator is configured such that reliability of operation is increased and damage of structural parts is largely avoided. The linear actuator achieves these results by virtue of the fact that there is at least one plastically deformable buffer element which can be supported on the housing head and can be deformed in the case of an impact of the piston. The buffer element is configured to convert kinetic energy into deformation work.