A sliding member includes a metallic substrate, a porous layer formed on a surface of the metallic substrate, and a sliding layer that covers the porous layer. The porous layer is made of a metal itself or an alloy composition. The sliding layer is made of a lead-free resin composition. The resin composition consists of a pitch-based carbon fiber and a fluororesin, and assuming weight of the resin composition as 100, more than 10 weight % and 35 weight % or less of the pitch-based carbon fiber is contained.

A hybrid rotational passive energy absorber (100) is configured to mitigate effects of a load on an attached system. An axle (170) is anchored to a housing (110) at a first axle end and a second axle end. A free swinging weighted arm (180) includes a beam (130) having a length L, a pivot portion (185) disposed at a first end of the beam, and an internal mass (120) at a second end of the beam. A bearing (160) rotatably connects the pivot portion to the axle. The bearing is configured to provide smooth motion of the weighted arm around an axis (150) of the axle in a rotation and/or oscillation plane orthogonal to the axis.

The present disclosure provides a rotational spring dampener that has a compression limiter, a first disk, and a second disk. The first disk is disposed at a first end of the compression limiter and the second disk is disposed at a second end of the compression limiter, where the second end is opposite the first end. The rotational spring dampener also has a tensile member. The tensile member is connected to the first disk and the second disk. The tensile member is composed of a block copolymer

A vibration damper and a washing machine including the same are disclosed. The vibration damper includes a tappet, a supporting rod slidably coupled to the tappet, a friction unit disposed inside the tappet and configured to rub the supporting rod, and a cap coupled to one end of the tappet and including a plurality of supporting blocks. The plurality of supporting blocks support an outer circumference of the supporting rod with non-uniform bearing power.

A landing gear includes a pair of skids, a cross tube and a stiffening portion. The pair of skids is arranged in parallel with a front-rear axis of an airframe of a rotary wing aircraft. The cross tube is attached to the airframe and coupling the pair of skids to each other. The cross tube includes curved portions located closer to end portions of the cross tube than to portions of the cross tube attached to the airframe. The stiffening portion suppresses flattening of the cross tube and is arranged in at least one of internal spaces of the curved portions or a stiffened portion located between a pair of curved portions. The stiffening portion includes an enlarged diameter portion which increases in diameter by an axial fastening power acting in an axial direction of the cross tube, and a fastening portion configured to generate the axial fastening power.

A switchable damper comprises a housing having a longitudinal axis, a plunger displaceable along the longitudinal axis, a piston arranged between the housing and the plunger, a friction lining arranged on the piston and a switching unit, which is switchable between a blocking arrangement, in which the piston is blocked with respect to a displacement along the longitudinal axis, and a free-moving arrangement, in which the piston is released with respect to a displacement along the longitudinal axis.

A variable damping assembly includes a base, a supporting member, a damping member, and an elastic member. The supporting member is positioned on the base. The damping member is rotatably coupled to the supporting member and presses against the housing. The elastic member includes a first end and a second end opposite to the first end. The first end of the elastic member is coupled to the supporting member and the second end of the elastic member is coupled to the housing. The elastic member provides an elastic force and the damping member provides a damping force changed as the elastic force changes.

The present application relates to a frictional damper, a frictional damper assembly and method for installing the frictional damper. The frictional damper comprises a split ring; and a disk spring positioned against the split ring and tensioned by the split ring in an installed state.

The present disclosure relates to a friction member and a master cylinder including the same. The master cylinder includes a cylinder body with a bore formed therein, a piston configured to move forward and backward in the bore and protrude a portion thereof from the cylinder body, a housing configured to surround the protruding portion of the piston and having a through hole formed therein such that an input rod connected to a brake pedal to press the piston is inserted, a friction member provided between the housing and the piston to increase a frictional force with the piston when the piston moves forward and backward, and a pedal simulator connected to the piston to provide a repulsive force to the brake pedal.

A damper apparatus includes a first rotating body, a second rotating body, and an elastic mechanism unit including an elastic body and paired seat members. The seat member includes a first surface portion coming into contact with one of the first rotating body and the second rotating body and a second surface portion coming into contact with another of the first rotating body and the second rotating body, a first angle θ1 formed by a first tangent line at a first point of contact, the first tangent line including a first vector and a second vector, and the first vector is 11.5°≤θ1≤22.0°, and a second angle θ2 formed by a second tangent line at a second point of contact, the second tangent line including a third vector and a fourth vector, and the third vector is 11.5°≤θ2≤22.0°.