A vibration-proof bush capable of suppressing incomplete fitting of an upper bush and a lower bush. The vibration-proof bush includes an upper bush configured to be mounted on a vehicle body side and a lower bush configured to be fitted to the upper bush are provided, wherein the vibration-proof bush includes interference portions configured to interfere with each other in a process of fitting the lower bush to the upper bush, and the interference portions form a fitting-sound generation structure in which a sound is generated, when the lower bush is fitted to the upper bush during temporary assembling.

A fluid damper is provided including a cylinder filled with a damping fluid, a piston base body shiftably guided in the cylinder along a stroke axis, and a valve disk spaced apart from a shell wall of the cylinder. The piston base body divides an inner space of the cylinder into a front space and a rear space along the stroke axis. In the piston base body, there is at least one channel connecting the front space to the rear space in a fluid-conducting manner. The valve disk is shiftably guided along the stroke axis between an opening position unblocking the at least one channel and a closing position closing the at least one channel. The valve disk has a central area extending radially outward from the stroke axis, the central area being free of apertures.

An industrial shock absorber system may include at least one sensor that is configured to measure an operating parameter of the industrial shock absorber during operation of the shock. The system may be configured to determine Time-Through-Stroke (TTS) and/or Rod Return Time (RRT) utilizing data from the sensor or sensors. The system may be configured to utilize machine learning to detect and/or predict a failure of the industrial shock absorber.

An adjustable damping valve device for a vibration damper, includes a main stage valve which is controlled by a pre-stage valve with a pre-stage valve body, which pre-stage valve can be actuated by an electromagnetic actuator, wherein an emergency operation valve controls the main stage valve during emergency operation, wherein an emergency operation armature is preloaded on the pre-stage valve body of the pre-stage valve by an emergency operation spring so that the pre-stage valve forms the emergency operation valve.

An electric power steering system. The system includes a steering rack having a first end and a second end and at least one damper coupled to one of the first end and the second end. The system also includes an electronic controller configured to determine if the damper has been destroyed based upon a sensed steering angle being above a maximum steering angle threshold or based upon a received signal from an electrical circuit enclosed within the at least one damper.

A method determines a service life condition of a torsional vibration damper or absorber having a primary mass and a secondary mass, and a working chamber arranged between the primary mass and the secondary mass that is filled with a viscous damping medium. The vibration damper is arranged on a crankshaft of an engine in order to dampen or eliminate torsional vibrations of this crankshaft. The method includes: operating the engine; determining at least one operating parameter of the engine; simulating a temperature distribution of the viscous damping medium in the working chamber; and determining a lifetime condition of the vibration damper based on the operating parameter of the engine and the result of simulating the temperature distribution of the viscous damping medium.

Provided is a temperature-driven valve assembly which can be manufactured in a cost-effective and simple manner as well as a gas pressure spring including the valve assembly which enables more reliable and safer operation of the gas pressure spring.

A flexible flywheel includes: a shaft fastening portion fixed to an end portion of an engine crankshaft; an annular inertia ring provided around the shaft fastening portion; a plurality of elastic spoke portions that extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening portion and the inertia ring to each other, and that absorb vibration acting on the crankshaft by undergoing deflection; and weight portions provided between adjacent elastic spoke portions, side edge-side boundary ends, to which boundaries with the weight portions are connected, are provided on both sides edges of the elastic spoke portion, respectively, when the elastic spoke portions are vibrated, stress concentrates on the side edge-side boundary ends.

A vibration damper for vehicles includes a damper tube which is at least partially filled with damper medium and which has a longitudinal axis along which a piston rod is movable back and forth. A working piston is movable jointly with the piston rod, by means of which working piston the interior space of the damper tube is divided into a piston-rod-side working space and a piston-rod-remote working space. The vibration damper has a leakage indicator for the damper medium.

Disclosed is a method of making a timepiece spring from monocrystalline material including the following steps: drawing the spring; identifying one or more zones of weakness of the spring in which or in at least one of which the spring will break in the event of excessive deformation; manufacturing the spring from a wafer of monocrystalline material extending in a determined plane, while orienting the spring in the wafer such that the direction of the macroscopic stresses in the or each zone of weakness when the spring is deformed is substantially parallel to a plane of cleavage of the material intersecting the determined plane. Also disclosed is a timepiece spring obtained by such a method.