112results about How to "Achieve damping" patented technology

PCT No. PCT / DE97 / 01887 Sec. 371 Date Aug. 7, 1998 Sec. 102(e) Date Aug. 7, 1998 PCT Filed Aug. 29, 1997 PCT Pub. No. WO98 / 25025 PCT Pub. Date Jun. 11, 1998A solenoid valve including a magnet armature having an armature disk and an armature bolt that is guided in a sliding part. In order to prevent a postoscillation of the armature disk after a closing of the solenoid valve, a damping device is provided on the magnet armature. With a device of this kind, a required short switching time of the solenoid valve can be precisely maintained. The solenoid valve (30) is designated for use in fuel injection systems with a common rail.

The invention discloses an Al-Fe-Zn-Mg rare earth alloy wire and a preparation method thereof. The aluminum alloy comprises the following elements: 0.3-1.2wt% of Fe, 0.01-0.3wt% of Zn, 0.01-0.4wt% of Mg, 0.1-1.5wt% of rare earth element and the balance of Al and inevitable impurities, wherein the rare earth element is composed of one or more of cerium, lanthanum, neodymium and yttrium. The preparation method of the aluminum alloy wire comprises the following steps: preparing an aluminum alloy rod through smelting, casting and rolling, performing insulation treatment in a heat holding cover at 240-320 DEG C for 10-20 hours, wiredrawing and extruding insulating material on the wire; or preparing an aluminum alloy rod through smelting, casting and rolling, drawing the aluminum alloy rod to prepare the aluminum alloy wire, performing semi-annealing treatment in an annealing furnace at 340-380 DEG C for 5-10 hours, and finally extruding insulating material on the wire. The aluminum alloy wire prepared by the method of the invention has excellent electrical property, mechanical property and corrosion resistance and can be used in the wire and cable conductors.

The invention relates to a directly controlled pressure control valve comprising a seat piston (6) in a longitudinal borehole (8) of a valve housing (4), said piston being radially guided in the longitudinal borehole, in its guiding region, by means of two peripheral interspaced guiding elements (36).

The invention relates to a damping method for forced vibration of an inertially stabilized platform. Electric connection is added between a vibration absorber and the inertially stabilized platform by introducing an active feedback link consisting of an angle sensor, an amplifier and a torquer to a passive vibration absorber, therefore, the added active feedback link increases comprehensive rotary inertia of an active part and a passive part of the vibration absorber in an electric manner; when external disturbance acts on the inertially stabilized platform, and under the condition that a control system does not participate in working, the passive part of the vibration absorber and the active feedback link generate the torque for resisting disturbance action simultaneously, so as to damp angle vibration of the inertially stabilized platform caused by external disturbance. By optimization of parameters of the vibration absorber, and under the condition that the specification of the passive vibration absorber is smaller, the purposes of improving the dynamic characteristic of the inertially stabilized platform, expanding damping the bandwidth of vibration of the system and reducing the steady-state error of the system are achieved. The damping method has the characteristics of independence, flexibility, simplicity and convenience and is applicable to an inertial system and a gyro device.

The invention provides a large-travel active adjusting damper of a SMA wire split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve comprises a split sleeve, a super-elasticity SMA wire, a piston, two external bolts, two damping rings and a mounting frame; the inner wall of the split sleeve is a periodic diameter change cylindrical surface, and is complementary with the outer wall of the piston in shape; two ends of the piston are connected with the external bolts for connecting the damper with other parts; two sides of the piston are respectively provided with one damping ring; and the super-elasticity SMA wire is uniformly wound on the insulation outer wall surface of the split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve fuses the material damping of a super-elasticity memory alloy, the dry friction damping and the damping ring damping to improve the vibration reducing performance, uses the structure of the periodic friction surface to enable once travel of the damper to include multiple loading and unloading processes of the super-elasticity SMA wire to effectively increase the vibration amplitude borne by the damper, can realize self-adaption rigidity and damping adjusting functions through control of the SMA wire, prevents the failure problem of a sealing piece, and is long in service life, wide in application range and high in reliability.

The invention relates to a vehicle damping kinetic energy collector, which is characterized by comprising a vehicle damping tray fixedly connected on an outer cylinder and a connecting plate connected with a wheel, wherein a stator is arranged in the outer cylinder; a vertically moving mover is arranged in the stator; the stator comprises a cavity which is arranged on a tooth magnetic plate and consists of a yoke magnetic ring and an inner ring; a plurality of stator units consisting of winding coils are arranged in the cavity, the plurality of the stator units are superposed in turn, and the winding coils of the plurality of the stator units under each electrode are connected forwards in the winding direction; the mover comprises a piston, a main magnetic lower guiding electrode, a permanent magnet and a main magnetic upper guiding electrode which are connected with a shaft sequentially from the bottom to the top; a turntable arranged on the outwards-extending end of the shaft is connected with a vehicle frame; a magnetism blocking plate is arranged on the topside of the stator; and an integrated controller is arranged in an outer enclosed cavity which is isolated by an upper internal pressure support ring between magnetism blocking rings under the magnetism blocking plate and an upper cylinder cover. The vehicle damping kinetic energy collector realizes current control through the intellectualization of damping information to collect vibration kinetic energy while achieving the flexible damping, thus the vehicle damping kinetic energy collector has the advantage of good adaptation to damping property, reduction of oil consumption, long service life and the like.

The invention discloses a building damping support, comprising multiple floating slabs, rubber damping belts and multiple damping units. A gap is formed between the floating slabs and a floorslab or ground through the support of the damping units arranged on the floorslab or ground, and the rubber damping belts are arranged between the adjacent floating slabs. The vibration isolation device can effectively isolate vibration of the building from the ground, a vibration isolation system is conveniently jacked in the construction process, and maintenance and replacement can also be realized in the using process.

The invention disclosed an active damping method of a Buck circuit brushless direct current motor control system. The active damping method can be realized through the following three kinds of modes: a Buck capacitor is connected in parallel with a virtual resistor; a Buck capacitor is connected in series with a virtual resistor; and an inverter bus is connected in series with a virtual resistor. According to the active damping method, a driving system is under rotation speed and current double-closed-loop control, wherein the outer loop is a rotation speed loop which adopts PI adjuster control, and the inner loop is a current loop, wherein the current loop adopts single-period control so that inductive current can better track a given value. When the value of the Buck capacitor is small, the method can increase the damping of the control system, and stabilize the output voltage of a Buck bus fast in a phase converting period, and therefore, motor phase current can fast recover a steady-state value in the phase converting period, and current resonance can be inhibited. A damping effect is realized through the control algorithm of the system, and the damping of the system can be effectively increased under the premise that system loss is not increased, and the resonance of the motor phase current can be suppressed, and the stability of the control system can be improved.

The invention relates to a sliding dual-rotating-shaft mechanism, an armrest box armrest and a seat armrest. The sliding dual-rotating-shaft mechanism comprises rotating cantilevers, a rotating rail support, coil springs, straight tooth bidirectional unidirectional ratchet wheels, first spiral springs, straight tooth unidirectional ratchet wheels, second spiral springs and check spring pieces, wherein one end of each rotating cantilever is connected with a peripheral armrest cover plate part, and one end of the rotating rail support is connected with a peripheral part (such as an armrest box body or a seat backrest) of an armrest to be installed. Virtual dual rotating shafts are achieved through an arc sliding rail and a rotating rail, the armrest rotates around rotating centers of the two virtual rotating shafts successively along purely circular tracks twice through matching of the ratchet wheels, gears, toothed rails, the springs and other parts, and therefore limits of the mechanism on armrest modeling and spatial arrangement are reduced.

The invention discloses an electromagnetic integrated type energy feedback suspension actuator of an electric vehicle and a control method of the electromagnetic integrated type energy feedback suspension actuator of the electric vehicle. The suspension actuator comprises a magnetorheological damper, a linear motor and an actuator monitoring device, wherein the magnetorheological damper comprisesa cylinder, a magnetorheological fluid, an inner chamber upper partition board and an inner chamber lower partition board, wherein the linear motor comprises a linear motor shell, a secondary part anda primary part; the actuator monitoring device comprises an actuator controller. The control method of the suspension actuator comprises the following steps: 1, data acquisition and transmission; 2,control of the suspension actuator by the actuator controller in an energy feedback mode, a primary damping mode, a secondary damping mode and an active mode according to sample data. The suspension actuator is reasonable in design, multi-mode switching of a suspension system can be realized according to different road conditions of vehicle traveling, energy waste of the electric vehicle is reduced, driving mileage of the electric vehicle can be increased, and the promotion and application values are high.

A single-cylinder double-cavity reciprocating damper comprises a cylinder body and a piston arranged in the cylinder body. A piston rod is fixed on the piston. One end of the piston rod extends out ofthe cylinder body. An end cover for sealing is arranged at the end, close to the piston, of the cylinder body. A sealing element for sealing is arranged at the other end of the cylinder body. A channel is arranged on the piston. A functional cavity filled with electrorheological fluid is arranged in the piston, and sliding sealing is realized between the functional cavity and the cylinder body. An electrode unit connected with a circuit and used for forming an electric field is arranged on the functional cavity and the cylinder body. The end cover is positioned at one side of the cylinder body, an air cavity is formed in the end cover, and the side, facing the inner side of the cylinder body, of the air cavity is a deformable piece. Sliding sealing is realized between the sealing elementand the piston rod through a sealing sleeve. According to the single-cylinder double-cavity reciprocating damper, a damping cavity in the piston is isolated from an inner cavity of the cylinder body by improving the structure of the piston, the damping effect can be realized through a small amount of electrorheological fluid damping liquid, the damping effect is controllable, and the sealing structure is simple.

The invention discloses a low-pressure rotating nozzle water sprinkler. The water sprinkler takes the shape of a disc, and comprises an upper surface and a lower surface, wherein the upper surface has a center part and multiple runner sets; the center part is positioned at the center of the upper surface and protrudes out relative to the edge of the water sprinkler; the runner sets downwards extend to the edge of the water sprinkler from the center part; a water current drops down from the center part and flows along the runner sets to be sprayed out from the water sprinkler; and each of the runner sets comprises a range runner, a driving runner, a U-shaped runner and a brake runner. The range runners are used for broadening the passing range of the water current; the water current flows along the driving runners to drive the water sprinkler to rotate ; the U-shaped runners are used for concentrating the flow of the water current to form jet flows with strong impact force; and the water current flows along the brake runners to reduce the rotating speed of the water sprinkler. The low-pressure rotating nozzle water sprinkler has the advantages of simple structure, excellent damping effect, stable operation, simple operation and installation and reduction of the nozzle manufacturing difficulty and manufacturing cost.

The invention provides a damping joint for a main manipulator. The damping joint comprises a first connecting rod, a second connecting rod, a rotary shaft assembly and a damping assembly, wherein thesecond connecting rod is rotatably connected with the first connecting rod; the rotary shaft assembly comprises a key shaft and a bearing; the key shaft penetrates through the first connecting rod andthe second connecting rod and is locked and fixed in the axial direction; the key shaft comprises a spline section and a cylindrical section which are fixedly connected; the spline section is in keyconnection with the second connecting rod; the cylindrical section is fixedly connected with the first connecting rod through the bearing; the damping assembly comprises a first rotary damper; the cylindrical section of the key shaft is sleeved with the first rotary damper; the rotary damper comprises a shell and a rotary body which rotate relatively. The shell and the first connecting rod are fixed. The rotary body and the key shaft are fixed. The first connecting rod drives the second connecting rod to rotate through the key shaft. The key shaft drives the rotary body to rotate synchronously. The rotary body and the shell rotate relatively to achieve the damping effect. According to the damping joint provided by the invention, the rotary damper is arranged in the joint structure of the main manipulator to achieve the stable damping effect, and the operation precision of the main manipulator is ensured.

The invention discloses a portable biological reagent kit. The portable biological reagent kit comprises a shell; an upper cover is installed at the upper end of the shell; the front inner wall and the rear inner wall of the shell are each fixedly connected with two first circular rings; second circular rings concentric with the four first circular rings are arranged in the four first circular rings, and the four second circular rings are all fixedly connected with the inner wall of the shell; every two arc-shaped blocks which are arranged up and down are slidably connected between the first circular ring and the second circular ring on the same side; and every two arc-shaped blocks are jointly and fixedly connected with a vertical rod, and a horizontal plate is fixedly connected between every two vertical rods which are opposite front and back. The portable biological reagent kit is reasonable in structure, it can be guaranteed that the horizontal plate is always in a horizontal state, that is, the biological reagent kit is always in a horizontal state, so that the situation that liquid in the biological reagent kit contaminates the inner wall of the biological reagent kit with alarger area is avoided, the possibility that cultured cells die or leak out is avoided, and the damping effect on the biological reagent kit is better.

The invention relates to a pile centralizing device for bridge construction. The device comprises a support, a driving mechanism, a clamping mechanism and a buffering mechanism, the driving mechanism is arranged on a supporting rod, the clamping mechanism is arranged on one side of the supporting rod, the buffering mechanism is arranged on the clamping mechanism, the support comprises a base and the supporting rod, and the driving mechanism comprises a driving assembly and a pulling assembly. The clamping mechanism comprises a connecting assembly, a positioning assembly, a pressing assembly and a tightening assembly, the buffering mechanism comprises a bottom plate and a buffering assembly, according to the pile centralizing device for bridge construction, the clamping of a pile is achieved through the clamping mechanism, damping buffering is conducted on downward sliding of the pile through the buffering mechanism, the downward sliding of the pile is made to be stable, and the safety is improved. According to the clamping mechanism, through multiple clamping, the good clamping effect is achieved, meanwhile, clamping blocks achieve a certain damping effect on the sliding down of the pile, multiple damping is conducted on sliding down of the pile, the better damping buffering effect is achieved, and the practicability is improved.

The invention belongs to the technical field of washing machines and particularly provides an upper cover damper for a washing machine, an upper cover slow descent device and the washing machine. The upper cover damper aims at solving the problem that an existing damper cannot increase damping force along with descent of an upper cover. The upper cover damper comprises a sleeve, and a piston inserted into the sleeve in a slidable mode. The upper cover damper further comprises a friction part, a compressible part and an elastic component. The friction part is connected to the side, close to the bottom of the sleeve, of the piston, and the outer diameter of the friction part is arranged to be in slidable tight connection with the inner wall of the sleeve. The compressible part is connected to the side, close to the bottom of the sleeve, of the friction part. The elastic component is arranged between the bottom of the sleeve and the compressible part. Through the arrangement of the friction part, the compressible part and the elastic component, three-section type gradually increasing damping force on the washing machine can be achieved, and therefore it is guaranteed that the whole process of covering of the upper cover is smoother.

The invention belongs to the technical field of steering columns, and particularly discloses an amphibious steering column for an amphibious vehicle. The steering column comprises a lower shaft, an upper shaft, an outer shell, a combination and separation sleeve, a switching locking module and a damping automatic centering module, the lower shaft and the upper shaft are coaxially arranged in sequence, a first key groove is formed in the lower shaft, a second key groove is formed in the upper shaft, and a key groove is formed in the inner side wall of the outer shell; the combination and separation sleeve is arranged on the peripheries of the lower shaft and the upper shaft in a sleeving manner, an inner key is arranged on the inner side wall of the combination and separation sleeve, an outer key is arranged on the outer side wall, the inner key can slide in the first key groove and the second key groove, and the outer key can move in the axial direction; and the switching locking module and the damping automatic centering module are arranged on the outer side wall of the combination and separation sleeve, and the switching locking module is used for shifting the combination and separation sleeve to slide in the axial direction and lock the combination and separation sleeve so as to achieve the combination or separation of the upper shaft and the lower shaft and the combination and separation of the lower shaft and the outer shell. The steering column has a amphibious steering switching and locking mechanism, and a water steering automatic centering and damping function.

The invention relates to a damping arrangement for damping / absorbing (figures 1-3) undesired pressure fluctuations in a hydraulic section, in particular for clutch actuation, comprising a master cylinder and a slave cylinder which are hydraulically connected to one another by means of a pressure line through which fluid flows. A damping / absorbing device (1) which is arranged coaxially to the pressure line is used, in which at least one anti-vibration unit (4) combined with a spring is used, and wherein, according to the invention, an additional buffer / damping system is integrated into the anti-vibration unit.

The invention relates to a valve assembly (1) for controlling the gas pressure in a gas rail (2) of a fuel system for supplying an internal combustion engine with a gaseous fuel, in particular with natural gas, comprising a first valve (3) for connecting the gas rail (2) to a gas feed (4), a second valve (5) for connecting the gas rail (2) to a gas return (6), and a control piston (7) for actuating both valves (3, 5), wherein the control piston (7) delimits a control chamber (8), to which a hydraulic pressure medium can be applied by a pressure medium feed (9) and which can be depressurized via a pressure medium discharge (10), and further comprising a sealing element (11) which is designed as a corrugated or folding bellows and is arranged between a gas chamber (12) and a pressure mediumchamber (13) for media separation. The valve assembly is characterized by a pressure differential limiting valve (14) having a reciprocating piston (15) which, on the one hand, is acted upon by a pressure (p1) prevailing in the gas chamber (12) and which, on the other hand, is acted upon by a pressure (p2) prevailing in the pressure medium chamber (13), and which opens an additional gas return (16) when a predetermined pressure differential applied to the piston (15) is exceeded. The invention further relates to a fuel system comprising a valve assembly (1) according to the invention for controlling the gas pressure in a gas rail (2).

The invention provides a noise elimination slowly-closed check valve with an inner damping system. The noise elimination slowly-closed check valve comprises a valve body. A valve plate is arranged ina spherical through cavity through a valve base fixed to an inner cavity in one side of the valve body. The valve body is internally provided with a positioning rod. The positioning rod is provided with a through cavity along the axis. The other end of the positioning rod is in sliding connection with a damping piston. A valve plate spring is arranged on the outer wall of the positioning rod. A deep hole is formed in the end, away from a reset spring, of the damping piston. The side wall of the position corresponding to the deep hole is provided with a crisscross medium releasing hole. The side, making contact with the reset spring, of the damping piston is provided with a flow accumulation hole in the axis direction, wherein the flow accumulation hole communicates with the deep hole. According to the noise elimination slowly-closed check valve with the inner damping system, through cooperation of simple structures and mutual adjustment of a series of damping movements of the piston, valve plate closing movement damping is achieved, valve slow closing and noise elimination are guaranteed, noise is lowered, the buffering effect is good, and the service life of the valve is prolonged.

The invention relates to a submersed nozzle for a high-casting-speed continuous casting crystallizer. The submersed nozzle comprises a side wall and a back cover; slag lines are arranged on the outer surface of the side wall; the back cover is mounted at the lower end of the side wall; the side wall forms an inner cavity with an upper opening in the vertical direction; more than one side hole are formed on the side wall and are positioned close to the upper part of the back cover; the side holes are communicated with the inner cavity of the side wall; the upper surface of the bottom of the inner cavity of the side wall is lower than the lower edge of any one side hole, so that the bottom of the inner cavity of the side wall is concave; and steel liquid flows in the inner cavity of the side wall from the upper opening, impacts the bottom of the inner cavity of the side wall, bounces and flows out from the side holes of the side wall. By adoption of the technical scheme, the bottom of the inner cavity of the side wall can effectively buffer the speed of the steel liquid, so as to dissipate kinetic energy of the steel liquid considerably, reduce the impact strength of the steel liquid at high casting speed, reduce impact of the steel liquid on the blank shell of the wall surface of a crystallizer as well as interference of the steel liquid with the liquid level, and avoid excessive fluctuation and slag entrapment of the liquid level.

The invention relates to a high-performance slow-shut check valve which comprises a main valve and a slot-shut mechanism, wherein a swing check valve is adopted as the main valve which is mainly characterized in that one end of a main valve rotating shaft extends out of the valve body and is connected with the slow-shut mechanism; the slow-shut mechanism is of a piston structure and comprises a cylinder body, a cylinder cover, a piston rod, a piston convex disk and a piston concave disk, one end of the piston rod is fixedly connected with the rotating shaft, part of the other end of the piston rod, which is positioned in the cylinder body, is provided with a T-shaped thread, the piston convex disk and the piston concave disk are respectively provided with a positive T-shaped thread and a negative T-shaped thread and meshed with the piston rod, a convex block of the piston convex disk is movably matched with a concave hole of the piston convex disk, and a piston cavity between the piston convex disk and the piston concave disk, a piston cavity between the piston convex disk and the cylinder body, and a piston cavity between the piston convex disk and the cylinder cover are respectively communicated with three port channels of a regulating valve. The high-performance slow-shut check valve has the characteristics of low closing noise, stable slow-shut performance, convenience forinstallation, simple structure and the like, and is suitable for control valves of preventing mediums on outlet pipelines of various pump stations from flowing backwards.

The invention relates to a ball-type guiding damping mechanism suitable for a general cone rod capturing mechanism of a high-orbit satellite, which comprises a rocker arm mounting seat (2), roller rocker arm structures and the like, wherein one end of a guide cylinder (9) is provided with the rocker mounting seat (2), and a sliding seat (4) is arranged on the guide cylinder (9) and slides along an outer wall of the guide cylinder (9); an annular damping rod supporting seat (8) is arranged on a flange plate at the other end of the guide cylinder (9); the roller rocker arm structures are uniformly distributed around a central axis of the guide cylinder (9), the one end of each roller rocker arm structure is rotationally connected with the rocker arm mounting seat (2), and the other end of the each roller rocker arm structure is rotationally connected with an end part of a damping rod (6); the one end of the damping rod (6) connected with the roller rocker arm structure is fixed on the flange plate at the end part of the sliding seat (4), and the other end of the damping rod (6) extends into a damping rod mounting seat (8) and slides along an inner wall of the damping rod mounting seat (8). The ball-type guiding damping mechanism suitable for the general cone rod capturing mechanism of the high-orbit satellite can adapt to a rolling target capture under a condition of weak impactand can provide larger relative speed and angular velocity tolerance for the cone rod capturing mechanism.

The invention relates to a sliding rotating shaft mechanism and an armrest box armrest. The sliding rotating shaft mechanism comprises a sliding rotating cantilever, a sliding rotating rail support, a straight tooth one-way ratchet wheel, a left spiral spring, a check spring piece, a right spiral spring, a straight tooth coil spring protective cover, a coil spring and a two-way ratchet wheel protective cover, wherein one end of the sliding rotating cantilever is integrated onto an armrest cover plate part, the sliding rotating cantilever comprises a left arm and a right arm, the left arm and the right arm are arranged in a left-and-right spaced mode, the sliding rotating rail support comprises a left sliding rotating rail and a right sliding rotating rail, and the left sliding rotating rail and the right sliding rotating rail are arranged in a left-and-right spaced mode. Linear rails and rotary rails are adopted, the armrest slides linearly and then move rotatably through matching of the ratchet wheel, gears, toothed rails, springs and the like, and therefore limits of the mechanism on armrest modeling and spatial arrangement are reduced; the armrest achieves the functions of damping and stagnation close to any position, and can achieve the function of automatic returning of the mechanism.

The invention provides a centrifugal self-locking damping mechanism and a photovoltaic device, and relates to the photovoltaic field. The centrifugal self-locking damping mechanism comprises a locking body and a cylindrical rotating body, the middle part of the locking body is provided with a cylindrical slot matched with the rotating body, one end of the rotating body is inserted into the cylindrical slot and is rotatably connected with the cylindrical slot, a lock pin part capable of sliding out outwards is embedded in the rotating body, at least one group of clamping grooves matched with the lock pin part are formed in the upper part of the cylindrical slot, the front end part of the lock pin part slides out and is inserted into the clamping grooves to brake the rotating body, and when sudden change external acting force is applied to the photovoltaic panel, the photovoltaic panel pulls the rotating body to rotate through the steel wire rope, the lock pin part embedded in the rotating body slides outwards under the action of centrifugal force until the front end part of the lock pin part slides out and is inserted into the clamping groove, and then the rotating body is braked, so the damping effect is achieved, the application range is wide, and the follow-up maintenance cost is low.

The invention relates to a device for safeguarding a lock (10) against manipulation, which lock (10) has at least one locking element (11) which, through an opening (12) in a lock case front (13) of the lock (10), can be moved out of the lock (10) into a locking position and back into the lock (10) into an open position. According to the invention, it is provided that at least one safeguarding element (14) is arranged on the locking element (11), and this therefore means that a gap (15) formed between the locking element (11) and the opening (12) is covered over.

The invention discloses an automatic damped height regulating pillow. A spring is arranged between a spring support of a pillow lifting damping mechanism and a pillow bottom plate; a hydraulic cylinder sleeve is arranged in the spring, the upper end of a piston rod of a piston in the hydraulic cylinder sleeve is connected with the spring support; the upper end of the hydraulic cylinder sleeve is provided with an oil storing cylinder sleeve with internal diameter more than that of the hydraulic cylinder sleeve, an upper port of the oil storing cylinder sleeve is provided with an oil seal seat body and an oil seal; and the vertical distance from the lower end face of an oil seal assembly to the upper end face of the hydraulic cylinder sleeve is less than the thickness of the piston. The invention has the advantages of ensuring that the whole damped mechanism has a small structure and is convenient for assembly, eliminating the idle stroke of the operation of the piston, realizing the complete damping of the operation process of the piston, and ensuring that the pillow cannot have failed damping in the beginning of the dropping during the lifting.

The invention discloses a ratchet wheel-bevel gear transmission knee joint negative work capturing lower limb exoskeleton. The exoskeleton comprises a thigh supporting plate, a shank supporting rod, a gear train carrying platform and a knee joint gear mechanism, one end of the gear train carrying platform is fixedly connected with the thigh supporting plate, and the other end of the gear train carrying platform is rotationally connected with the knee joint gear mechanism through a first axial rotating piece; and the end, away from the connected gear train carrying platform, of the knee joint gear mechanism is connected with the shank supporting rod, a coil spring is further arranged on the first axial rotating piece, the inner end point of the coil spring is fixedly connected to the first axial rotating piece, and the outer end point of the coil spring is used for being fixedly connected with the gear train carrying platform so that the coil spring can be compressed during knee stretching movement, and resetting is realized during knee bending movement. According to the scheme, negative work in the knee joint stretching process can be effectively absorbed, then impact of the negative work on a knee joint is relieved, and the knee joint is effectively protected.

The invention discloses an external piezoelectric ceramic variable damping damper. The damper includes an outer damper cylinder, a middle damper cylinder and an inner damper cylinder, wherein a damperrod penetrates through a damper sealing cover and is then inserted into an inner damper cavity, a one-way piston valve is fixed to a lower end of the damper rod, a guide limit card is arranged on anupper portion of the one-way piston valve on the damper rod, a one-way bottom valve is crimped and sealed with the inner damper cylinder and the middle damper cylinder, a piezoelectric ceramic dampingvalve is disposed outside the outer damper cylinder, a damping valve connecting bridge snap ring is arranged on the middle damper cylinder, the interior of the piezoelectric ceramic damping valve isconnected with the damping valve connecting bridge snap ring through a damping valve connecting bridge, and the damping valve connecting bridge is provided with a connecting bridge overflow hole communicating with an outer damper cavity. Piezoelectric ceramics stacked together are utilized by the piezoelectric ceramic damping valve as an actuator. The damper is advantaged in that the damper is electrically controllable, is with fast response, has the large variable damping ratio and low cost, has high reliability and is not affected by special material processes.