Methods and apparatus to control movement of a component are disclosed herein. An example apparatus includes a housing defining a bore and a piston disposed inside the bore. The piston is to be coupled to a movable component disposed outside of the bore. The example apparatus further includes a fluid flowline in fluid communication with a first chamber of the bore and a second chamber of the bore. The first chamber is on a first side of the piston, and the second chamber on a second side of the piston. The example apparatus also includes a valve to control fluid flow through the fluid flowline. The valve is to be in a first state to enable the piston to dampen movement of the component, and the valve is to be in a second state to enable the piston to hold the component substantially stationary.

Methods and apparatus to control movement of a component are disclosed herein. An example apparatus includes a housing defining a bore and a piston disposed inside the bore. The piston is to be coupled to a movable component disposed outside of the bore. The example apparatus further includes a fluid flowline in fluid communication with a first chamber of the bore and a second chamber of the bore. The first chamber is on a first side of the piston, and the second chamber on a second side of the piston. The example apparatus also includes a valve to control fluid flow through the fluid flowline. The valve is to be in a first state to enable the piston to dampen movement of the component, and the valve is to be in a second state to enable the piston to hold the component substantially stationary.

A vehicular hydraulic system includes a first hydraulic drive device configured to be driven by a hydraulic pressure generated in a first hydraulic pump, a second hydraulic drive device configured to exhibit an action different from that of the first hydraulic drive device and to be driven by a hydraulic pressure generated in a second hydraulic pump, and a single motor serving as a common power source for the first hydraulic pump and the second hydraulic pump.

A vehicular hydraulic system includes a first hydraulic drive device configured to be driven by a hydraulic pressure generated in a first hydraulic pump, a second hydraulic drive device configured to exhibit an action different from that of the first hydraulic drive device and to be driven by a hydraulic pressure generated in a second hydraulic pump, and a single motor serving as a common power source for the first hydraulic pump and the second hydraulic pump.

The invention relates to a new type of tuned mass damper which is suitable in particular for damping oscillations of a low frequency, and can thus be used preferably as a construction damper when building or siting high, narrow structures, such as wind-turbine towers. The invention relates in particular to a pendulum oscillation damper having a first pendulum, to which the mass is attached, and a second pendulum, which is formed by a spring-like support device of a different design and is operated using a gas-air volume such that, with the aid thereof, the frequency of the oscillation system can be adapted and adjusted.

A suspension strut includes a cylinder having a piston moveable in the cylinder, a coil spring arranged around the cylinder, and an abutment element for mounting the coil spring. The position of the abutment element is adjustably fixable along the longitudinal direction of the cylinder with respect to one direction, the cylinder has a male thread, and the abutment element has a female thread corresponding to the male thread. A thread insert is arranged in the abutment element, the thread insert has a holding region and an actuating region, and the region between the holding region and the actuating region can be arranged in the threads of the male thread of the cylinder. A holding means for the holding region is in the abutment element, the actuating region is mounted moveably in the abutment element, and the diameter of the thread insert is variable by movement of the actuating region.

A shock strut may comprise a strut cylinder, a strut piston operatively coupled to the strut cylinder, a shrink piston disposed at least partially within the strut cylinder, and a shrink chamber at least partially defined by the shrink piston. The shrink piston may comprise a shrink piston head, a sleeve extending from the shrink piston head, and a mechanical stop. A hydraulic fluid may be moved into the shrink chamber to compress the shrink piston and the strut piston into the strut cylinder to reduce an overall length of the shock strut.

A spring and damping arrangement for adjusting the spring rate and the driving position of a motorcycle includes a series circuit having at least one helical spring, an air spring unit, and a hydraulic actuating element. The spring rate of the air spring unit is changeable as a function of a force acting from the outside on the spring and damping arrangement, such that the driving position change resulting from the applied force is compensated by the hydraulic loading of the hydraulic actuating element, such that a defined driving position can be adjusted or maintained.

A flow path control device according to one embodiment includes a first valve, a unit main body and a control valve. The unit main body has an accommodation portion, a first radial communication hole and a side recess portion. The accommodation portion is recessed from a chamber accommodating the oil to cause the first valve to close the first radial communication hole. The side recess portion is recessed from the chamber so as to be continuous to the accommodation portion and not to be continuous to the first radial communication hole. The control valve is movable in the accommodation portion of the unit main body between a position at which a groove of the control valve communicates with the side recess portion and the first radial communication hole and a position at which the groove does not communicate with them.

An exemplary assembly includes a cylinder, a piston, and a lock. The lock is transitionable between an unlocked position that permits extension and retraction of the piston relative to the cylinder, and a locked position that limits retraction of the piston relative to the cylinder. The lock is blocked from transitioning from the locked to the unlocked position when a load supported by the piston exceeds a threshold load. An exemplary method includes transitioning a lock from an unlocked to a locked position. The lock in the unlocked position permits extension and retraction of a piston relative to a cylinder. The lock in the locked position limits retraction of the piston relative to the cylinder. The method further includes holding the lock in the locked position using a load supported by the piston that exceeds a threshold load.