Abstract: A spool-shaped damper piston which is slideably mounted on a damper rod and has an external foam friction element engaging the inner surface of the cylindrical damper body. A pair of axially movable limiting disks are spaced from the spool-shaped damper a predetermined distance to allow movement of the damper rod a predetermined amount before the spool-shaped damper is engaged. In one embodiment, the disks include axially extending tabs which extend through slots in the ends of the spool and selectively engage the foam friction element when the motion of the damping rod exceeds a predetermined threshold. In another embodiment of the invention, the limiting disks include spring fingers extending between the disks and the spool ends to cushion the initial engagement between the disks and the spool as the free space threshold is exceeded.

Abstract: A torsional vibration damper includes: a primary mass defining a substantially, ring-shaped chamber that is divided into at least two portions; a secondary mass relatively rotatably connected to the primary mass; and a plurality of damping units disposed in the divided portion of the ring-shaped chamber for coupling the primary and secondary masses to each other in a rotatable elastic manner. Each of the damping units includes a plurality of coil springs, and outer and inner wedge-shaped friction guides. The coil springs are situated in series and disposed one after the other within the divided portions of the ring-shaped chamber. The outer and inner wedge-shaped friction guides face each other along facing surfaces thereof. Each of the facing surfaces of the outer and inner wedge-shaped friction guides are entirely slanted with respect to a radial direction of the primary mass.

Abstract: Various embodiments of the invention include products and parts including a frictional damping means and methods of making and using the same.

Abstract: In a damper, in particular for spin-drying cylinder washing machines, it is provided, with a view to obtaining low-noise and low-wear guidance of a tappet in a casing, that the damper comprises a guiding damping unit which damps any deflections of the tappet in the radial direction and centers the tappet in the casing.

Abstract: A friction damper includes a base body; a support secured to an elongated member of the base body and having a through hole; a rod which extends in such a manner as to pass through the through hole of the support and is movable in an axial direction with respect to the support; a friction member which has a hollow cylindrical portion interposed between the support and a main body portion of the rod in the through hole of the support, and which is fixed immovably with respect to the relative movement of the rod in the axial direction with respect to the base body; and a tightening structure provided for the support so as to tighten the hollow cylindrical portion of the friction member onto the main body portion of the rod.

Abstract: A friction damper with a housing including a cavity. The damper includes a first member disposed in the cavity and movable in the cavity; a second member disposed in the cavity; an intermediate member between the first and second members, the first member being in frictional engagement with the intermediate member; and at least one magnetic field generator mounted to magnetically couple the first and second members thereby maintaining the first member in frictional engagement with the intermediate member and wherein the first member is movable against the intermediate member to generate a damping force.

Abstract: Linear dampers are capable of offering an expected damping force without the use of oil or gas. A casing body 10 has a cylindrical portion 14 and a damping groove 15 continuing with each other and axially extending. The side face of the damping groove 15 are tapering faces 17 between which the space gradually opens up toward the opening of the damping groove 15. A slider 18 constituted of a first moving member 19 and a second moving member 20 is inserted into the casing 10. When the slider 18 is inserted into the casing 10, an inclined face 28 of the second moving member 20 and an inclined face 24 of the first moving member 19 are in contact with each other and tapering faces 29 of the second moving member 20 and the tapering faces 17 are in contact with each other.

Abstract: This invention relates to a process and a device for the damping of motion between two cylindrical parts sliding with one another in translation and friction. According to this invention, the damping is performed by the application of a force exerted radially perpendicularly to the translation motion of the two parts by at least one elastic segment (13) circling one of the parts (11) and inside the other (12), integral in translation with one of the parts (11) and appplying said frictional force on the other part (12). This invention is applicable to the absorption of shocks as well as to that of vibrations.

Abstract: A damper for reducing recoil and vibrations during and after firing a firearm may comprise a resilient member and a weight. The resilient member may mounted to a portion of a firearm having a surface suitable for engaging and retaining the resilient member therein, and the resilient member may have an inside surface suitable for engaging and retaining the weight.

Abstract: A friction damper a housing including a cavity formed therein; a first member disposed in said cavity and movable in the cavity; a second member disposed in the cavity; an intermediate member between the first and second members, the first member being in frictional engagement with the intermediate member; and at least one magnetic field generator mounted to magnetically couple the first and second members thereby maintaining the first member in frictional engagement with the intermediate member and wherein the first member is movable against the intermediate member to generate a damping force.

Abstract: An impact absorber for a vehicle includes an outer body including a cavity having an axis, and an inner body situated partially within the cavity for relative movement into the cavity when the absorber is subjected to an impact. The inner body has at least one lateral protrusion. A number of deformable units are located in the outer body at different positions along the cavity. The deformable units partially protrude into the cavity for successive engagements and deformations, one unit after another unit, along the cavity, by the protrusion of the inner body moving into the outer body, thereby absorbing the energy of an impact in different stages. Each deformable unit includes a rigid ball protruding into the cavity and a deformable plate fixed behind the ball.

Abstract: A damper device includes a shaft 2 inserted relatively rotatably into an axial hole 1a provided in a bearing portion 1. A high flexible resin portion 3 is provided between an outer circumferential surface of the shaft 2 and an inner surface of the axial hole 1a. A recess portion 4, with which the high flexible resin portion 3 contacts, and into which the high flexible resin portion 3 bites by relative rotation of the shaft 2 to the bearing portion 1, is provided in either one or both of the inner surface of the axial hole 1a and the outer circumferential surface of the shaft 2.

Abstract: An object such as an automobile part, an image forming apparatus part, a bicycle part, other machine parts, a sport article or its part, a toy or its part, or a rain article or its part has a portion to be in contact with a contact object. The contact portion is made of at least one kind of material selected from a group including polymer material such as resin or rubber as well as glass, and the contact portion has a surface entirely or partially coated with a carbon film (typically, a DLC film) having a wear resistance as well as at least one of a lubricity, a water repellency and a gas barrier property. The carbon film is formed on the object with a good adhesion.

Abstract: A method and apparatus for determining the vibration damping characteristics of an automotive brake structure measures the vibration response of a brake structure during application of random-frequency wide spectrum excitation, followed by measuring vibration of the structure at particularly noted modal frequencies, using a confined bandwidth random-frequency vibratory excitation. The method and apparatus may be used also to assess the bonding or attachment characteristics of damping materials.

Abstract: A method and system for calculating a control function for a structural system (10) that can be used to determine an appropriate control force to apply to an active member (18) within a stationary member (12) on the structural system (10). An active member (18) and a stationary member (12) are defined as a two-mass system in which the active member (18) and the stationary member (12) move in opposite directions. The stationary member (12) is mounted to an isolation subsystem (14) that is composed of six isolators (28) at multiple degrees of freedom. The isolation subsystem (14) is softer than the stationary member (12), active member (18) and a spacecraft surface (16) due to a damping element (32) of the isolation subsystem (16). The isolation subsystem (16) is mounted to the spacecraft (16) and decouples the spacecraft (16) from the stationary member (12) and thus the active member (18). An accurate control force for the active member (18) can be determined based upon the above structure (10).

Abstract: Linear dampers are capable of offering an expected damping force without the use of oil or gas. A casing body 10 has a cylindrical portion 14 and a damping groove 15 continuing with each other and axially extending. The side face of the damping groove 15 are tapering faces 17 between which the space gradually opens up toward the opening of the damping groove 15. A slider 18 constituted of a first moving member 19 and a second moving member 20 is inserted into the casing 10. When the slider 18 is inserted into the casing 10, an inclined face 28 of the second moving member 20 and an inclined face 24 of the first moving member 19 are in contact with each other and tapering faces 29 of the second moving member 20 and the tapering faces 17 are in contact with each other.

Abstract: The invention relates to a disk brake, particularly for commercial vehicles, comprising a brake caliper (1) covering a brake disk (3), a tensing device (13) arranged in a brake caliper for tensing the brake pads (5, 7) on both sides of the brake disk (3) in the direction thereof, and at least one regulating system arranged in the brake caliper in order to equalise the brake pad and/or disk deterioration by adjusting the distance between the brake pad (7) and the brake disk (3). The invention is characterised in that at least one or more adjusting rotational devices which are driven by an electric motor are provided on each side of the brake disk (3) to adjust the axial distances between the brake pads (5, 7) and the brake disk (3). According to a method for controlling the regulating system of the brake disk, the regulating rotational device is individually controlled on both sides of the brake disk.

Abstract: Fluid current induced vibrations, as well as vortex shedding vibrations induced in a cable stay or a similar elongated, cylindrical element are dampened and substantially eliminated by applying a plurality of flexible active or passive damper bands to the cable at spaced intervals. In underwater currents, the damper bands force or channel the fluid flow over a circular cross-sectional shape, which inhibits lift, and therefore damps the cable stay oscillations. These damper bands can be retrofit to existing cables or can be installed on new cables. Each damper band may include a shiftable mass and an energizing device for facilitating assisted shifting of the mass. A control assembly can actuate all or selected ones of the energizing devices in response to sensed magnitudes of cable stay vibration.

Abstract: An apparatus for the damping of impacts, preferably the impacts of furniture doors or drawers, consists of a cylinder with a piston whose piston rod sealingly guided out of a cylinder side forms a ram absorbing the impacts which divides the cylinder space filled with a liquid into two chambers and has perforations and/or, together with the cylinder wall, bounds a passage gap. A guide bushing guiding the piston rod is arranged in the region of the discharge end of the cylinder. A compression spring is clamped between the piston and the cylinder bottom. To ensure a smooth and quiet running with a compact construction, the guide bushing has a central shaft part of reduced diameter. A widened end part of the guide bushing is supported on a step or annular flange constricting the inner diameter of the cylinder and the guide bushing is supported at the other end on a cover closing the cylinder. The shaft part of the guide bushing is encompassed by a tube-section-like part made of elastic material.

Abstract: An object of the present invention is to provide a novel damper device that has an extremely high commercial value.

Abstract: The damper assembly includes a centering spring about a bearing for a rotating shaft. The centering spring is fixed to and spaced from a fixed component. One or more annular arrays of brush bristles project from the fixed component and have tips in engagement with the non-rotating, radially and orbitally movable centering spring. With the brush bristles engaging the centering spring, the vibrations and dynamic loadings of the shaft on the bearing and centering spring are damped.

Abstract: A method for making a friction damper for linen washing machines which have a damper rod that is telescopically driven inside a mantle, and at least a friction element, arranged between said rod and mantle and housed in a housing cavity therefor. The method is based on a first molding step for molding a friction damper casing having a hole for housing said rod and a friction element housing cavity, and a second operating step for making, in said cavity, a plurality of restraining undercut portions for restraining said friction element.

Abstract: In an item of furniture having a movable furniture part, such as a drawer, door or folding part, there is provided a damping means which damps movement of the movable furniture part in the closing phase of the closing and/or opening movement. The damping means is constructed as a negative-pressure damping means or combined pressurised and negative-pressure damping means. It has a piston (3) with a resiliently deformable piston part (6) in the piston rod (4), this resiliently deformable piston part (6) being pressed against the cylinder wall during the damping procedure.

Abstract: A vibration isolation device comprising a housing with a housing wall that defines a housing chamber, a first spring pack, a second spring pack, and a surface effect damper located between the first and second spring packs. The first and second spring packs and damper being located in the housing chamber. The isolation device further comprises a fuse mechanism which causes the device to act as a hard mount before the fuse is actuated and as a soft mount after the fuse is actuated.

Abstract: A system for the mitigation of cable stay vibrations, typically induced by wind and rain, utilizes a plurality of active damper bands positioned along the cable stay. Each damper band includes a shiftable mass and an energizing device for facilitating assisted shifting of the mass. A control assembly can actuate all or selected ones of the energizing devices in response to sensed magnitudes of cable stay vibration.

Abstract: A damper includes a barrel axially slidably mounted on a shaft, an elastic ring mounted inside the barrel around the shaft, arched pressure blocks mounted abutted against one another inside the elastic ring around the shaft, each arched pressure block having an axially extended sloping groove, steel balls respectively arranged in the sloping groove of each arched pressure block in contact with the periphery of the shaft, a rigid locating ring mounted inside the barrel to support the steel balls in the sloping groove of each arched pressure block, a screw cap threaded into one side of the barrel, a compression spring stopped between the screw cap and the locating ring, a hollow adjustment screw member threaded into one side of the barrel to support the steel balls in the sloping groove of each arched pressure block against the locating ring.

Abstract: A friction dampener can include a housing having one end slidably surrounding one end of a shaft movable relative thereto. Opposing ends of the housing and shaft can each having a connecting eye member for connection to separate independently movable elements. One or more friction elements can be carried by the shaft which frictionally engage inner surfaces of the housing. The friction elements can have inner and outer portions having different material properties. The housing can be adapted to generally maintain the pressure between the friction elements and the housing within a range of desirable pressures.

Abstract: The present invention relates to a friction damper, which has been specifically designed for washing machines or the like, comprising a hollow shell (1) and a rod (2), coaxially arranged with respect to one another, which define a telescopic construction. The rod is provided with an outer diameter smaller than the inner diameter of the shell (1) and, between the shell (1) and rod (2), a friction damper element (3) is arranged. The friction damper element (3) comprises at least two friction clamps (4,5) contacting the surface of the rod (2) and axially spaced from one another, along that portion of the rod (2) which is engaged in the shell.

Abstract: A mechanical device for controlling changeover between two modes of relative displacement between two objects comprising: two assemblies capable of moving in guided relative translation, one assembly being said to be fixed, and the other being said to be moving, the device further comprising: resilient control means interposed between the two assemblies with a controlled clearance to define the mode of relative displacement; and an inertial mass associated with one of the assemblies and adapted to act selectively on the control means as a function of the time profile of moving assembly displacement in order to modify the clearance and the mode of relative displacement.

Abstract: A linear motion damping device comprises a cylindrical body having a receiving compartment and an axial hole, in which a dragging rod is slidably disposed such that the threaded portion of the dragging rod is engaged with a fastening member which is confined to turn around the dragging rod at such time when the dragging rod is exerted on by an external force along the axial direction of the dragging rod. The fastening member acts to provide the dragging rod with a damping force at the time when the dragging rod is engaged in a displacement along the axial direction thereof.

Abstract: Elastomer dampers (20) and (120) for damping movement between two relatively moveable members, such as shimmy motion between components in an aircraft landing gear assembly (10). Each damper includes a housing (24) having an internal cavity (36) with a cylindrical interior surface (34) and an opening (41), and a member assembly (28, 128) moveable relative to the housing (24) having an elongated shaft (30) received through the opening (41) with a piston head assembly (32) mounted thereon. The piston head assembly (32, 132) has a annular support element (46, 146) received over the shaft (30) with a sleeve-like elastomer member (48, 148) received over it. The elastomer member (48, 148) engages the interior surface (34) in an interference fit relationship thereby radially precompressing the elastomer element (48, 148) in the range of between about 5% and 15%.

Abstract: A friction dampener can include a housing having one end slidably surrounding one end of a shaft movable relative thereto. Opposing ends of the housing and shaft can each having a connecting eye member for connection to separate independently movable elements. One or more friction elements can be carried by the shaft which frictionally engage inner surfaces of the housing. The friction elements can have inner and outer portions having different material properties. The housing can be adapted to generally maintain the pressure between the friction elements and the housing within a range of desirable pressures.

Abstract: The present invention relates to a friction damper which has been specifically designed for washing machines or the like. The damper (1a, 1b) comprises a hollow shell (2a, 2b, 2c) and a rod (3), coaxially arranged, which form a telescopic construction. The rod (3) is provided with an outer diameter smaller than the inner diameter of the shell (2a, 2b, 2c), and between the shell (2a, 2b, 2c) and the rod (3), guiding means (4) are provided. The damper further comprises a friction damper element (5) arranged between the rod (3) and the shell (2a, 2b, 2c) and having a first working surface which is frictionally slidably coupled to the rod (3) and a second working surface which is frictionally slidably coupled with the shell (2a, 2b, 2c).

Abstract: An elastomer damper (20) for damping movement between two relatively moveable members, such as shimmy motion between components in an aircraft landing gear assembly (10). The damper (20) includes a housing (24) having an internal cavity (36) with a cylindrical interior surface (34) and an opening (41), and a member assembly (28) moveable relative to the housing (24) having an elongated shaft (30) received through the opening (41) with a piston head assembly (32) mounted thereon. The piston head assembly (32) has a annular support element (46) received over the shaft (30) with a sleeve-like elastomer member (48) received over it. The elastomer member (48) engages the interior surface (34) in an interference fit relationship thereby radially precompressing the elastomer element (48) in the range of between about 5% and 15%. Low friction washers (50a, 50b) are preferably positioned adjacent to the ends of the elastomer ember (48) and the support member (46).

Abstract: An electric machine with a stator and a rotor arranged in the drive train of a drive unit is disclosed. A vibration insulation device is incorporated in the rotor of the electric machine. The electric machine can function as a starter/generator, a generator vehicle brake, an auxiliary drive and/or an active vibration damper.

Abstract: A rotational dampening apparatus 10 includes a cup-shaped housing member 12 and, mounted for rotational movement in the cup-shaped housing member, a rotor member 14 and a dampening member 16, the dampening member being held compressed between the rotor member and the cup-shaped housing member. The cup-shaped housing member includes a substantially planar annular end wall 32 and a cylindrical side wall 34 extending from the end wall. The rotor member and the cylindrical side wall respectively define cooperating first and second circular connection areas 38, 36 for snap-lock connecting the rotor member 14 to the housing member 12. The first and second circular connecting area form a bearing surface upon which the rotor member rotates. A first dampening interface A is created between a set of ribs 60 disposed on the end wall of the housing member and the bottom face surface 52 of the dampening member.

Abstract: A suspension rod assembly for a resiliently supporting a moving system of a washing machine. The suspension rod assembly includes a rod having an upper end engaging a stationary support structure and a lower end. An end cap including a washer and an annular retainer is mounted to the lower end of the rod. A friction tube is disposed about the lower portion of the rod and has a flanged bottom edge captured between the annular retainer and the washer. The friction tube extends upwardly from the end cap about the rod and a tubular cup is provided about the friction tube. The cup includes a cylindrical wall forming an elongated annular cavity between the friction tube and the cylindrical wall. A compressible friction member is disposed within the elongated annular cavity and is radially compressed between the cylindrical wall and friction tube for frictionally engaging the friction tube.

Abstract: A shock absorber for damping the vibrations of the car by friction between two solid materials. The first solid material is the square aluminum cylinder and the second consists of two aluminum links. The two links are hinged at one end by the rod and pushed at the other end against the cylinder by a spring. This arrangement will help selecting the pulling force and the pushing force as required and within reasonable values.

Abstract: The invention relates to a rotation damper (1) including a plastic housing or storage part (2) carrying therein a rotor part (3). The rotor part (3) is joined to a rotatable shaft which extends through the housing. A damping device (4) is located between the storage part (2) and the rotor part (3). The damping device (4) surrounds the shaft and is made of damping plastic. The rotor part (3) and/or the damping device (4), respectively have at least one interengaging contact part which produces rotation resistance when the shaft is turning.

Abstract: A shock absorber for a real wheel of a bicycle includes a body for connection to an axle of the wheel, a lower mounting member threadedly engaging around a circumferential periphery of the body, a first cushioning element made of urethane fixedly received in a cavity of the body, an upper mounting member for connection to a frame of the bicycle, a second cushioning element made of urethane mounted between the upper mounting member and the body, a rod having a top end fixedly connected to the upper mounting member and extending downwardly through the second and first cushioning elements, wherein the rod has an interference fit with the first and second cushioning elements, and a spring fixedly mounted between the upper and lower mounting members.

Abstract: The method reduces vibrations generated in a contactor due to movement of the moving body by which the contactor contacts with a moving body. When a stroke of vibration of the contactor is halved at an intermediate point of an amplitude thereof, the vibrations are made different from each other in frequency between the reciprocation stroke in the forward side which corresponds to one of the halved stroke portions and the reciprocation stroke in the backward side which corresponds to the other halved stroke portion.

Abstract: A retardation system for adjustably reducing the speed of an object moving relative to the retardation system. The retardation system comprises a retardation mechanism to which is transferred the kinetic energy of the object when the speed of the object is being reduced by the retardation mechanism, and a computing device for computing the kinetic energy to be transferred to the retardation mechanism in the form of retardation forces, calculated over time, of the object during its retardation process.

Abstract: A rotation retarder has a startor (1), a rotor (3) designed to receive the rotational movement to be retarded, and an elastic component (10) disposed between the rotor and the stator (2) the stator (2) having a seat (4) from which projects a shaft (6) with an overall cylindrical wall, and the rotor (3) having a housing (13) with an overall cylindrical wall for rotational mounting on the shaft (6). The retarder (1) is characterized in that the elastic component (10) is in direct contact with the wall of the shaft (6) and the wall of the housing (13) between which it is compressed, the area of contact between the first one of these walls and the elastic component (10) being larger than the area of contact between the second one of these walls and the elastic component (10), whereby the elastic component (10) is held on the first wall while the second wall is able to slide with respect to the elastic component (10).

Abstract: The present invention is concerned with a torque variation restraining device of an engine accessory driving system. It is possible to reduce the gear grating noise of the engine gear system and reduce a load on the gear tooth surfaces by restraining torque and/or rotation variations of the driving shaft and the gear system, which variations are generated as the driven torque of the engine accessory varies sharply. For this purpose, a compartment is provided between a retainer housing (4) and the driving shaft (1) of the engine accessory, a friction damper (6) which surrounds the outer periphery of the driving shaft (1) is disposed in this compartment, and an oil supply means (10) introduces engine lubricating oil between the friction damper (6) and the retainer housing (4).

Abstract: An automatic washing machine suspension system includes a plurality of suspension units. Each unit includes a rod suspended from a stationary support ring. A hollow cylinder, with a cylindrical side wall and a transverse base, is connected to the moving system and is mounted around the distal end of the rod. A piston mounted on the rod within the cylinder side wall includes a circumferentially continuous skirt extending axially of the side wall. A retainer spring mounted on the rod within the skirt includes a series cantilever beam fingers biasing the piston skirt into engagement with the cylinder side wall. A washer is mounted on the rod within the fingers. A coil spring is mounted around the rod and extends between the base of the cylinder and the piston.

Abstract: A rotary damper comprises a housing, a disc-shaped rotor which is supported within the housing so as to be rotatably and axially displaced in the housing, the rotor including an axially aligned annular friction surface which coacts with a coaxial annular friction surface inside the housing, and a spring within the housing which axially presses the rotor against the friction surface of the housing.

Abstract: A stator (2), a rotor (5, 6, 7, 8), and an elastic element (3) and rolling members (4) are provided to collectively form a rotational damper. When the rotor has, with respect to the stator, a rotational movement to be moderated, the balls or rolling members (4) are driven by the rotor while remaining partially embedded in the elastic element (3), the latter having a wall (16) parallel to the end walls (10A, 10B) of the stator (2), in which the balls (4) penetrate, so as to resist and thereby dampen the rotational movement. This embodiment provides two-directional dampening. In accordance with a second embodiment, one-directional dampening is achieved by the balls (4) being disposed within variable depth recesses (24') of the rotor element (5').

Abstract: A frictional damper for spinner-type washing machines comprises a housing and a tappet, which is coaxially displaceable within the latter and the inner end of which is provided with a damping piston. The damping piston is disposed on a piston-bearing section of the tappet to be displaceable between biased compression springs bearing against stops, and provided with a friction lining elastically pressed against the inside wall of the housing.

Abstract: A nonlinear shock absorber is disclosed. The device has a housing filled with hydraulic fluid and contains a relatively heavy mass or piston supported by a helical coil. The helical coils disposed and shaped so as to provide a nonlinear resistance to a shock applied to the housing. During shock absorption fluid flows contra to the piston movement with a corresponding elongation of the helical coil spring causing the coil spring to engage an inner wall of the housing to provide for frictional dampening.

Abstract: A brake device for damping a translatory motion having a bearing housing and a brake disk both made of a resilient, hard elastic plastic material. The brake disk is supported for rotation in the bearing housing and adapted for rotation in response to a translatory motion, the brake disk having an outer conically shaped friction surface and the bearing housing a correspondingly configured inner conically shaped friction. The surfaces are held together when the disk is supported in the housing to generate frictional resistance between them as the disk rotates in the housing in response to a translatory motion and thereby dampen the motion.