41results about How to "Adjust the damping force" patented technology

The invention provides a damper with energy recovery, comprising sleeve, piston, magnet and coil. There are two said magnets, which are fixed on the inner wall of sleeve respectively and the N pole of one magnet is opposite to the S pole of the other magnet. Said piston is set in the magnetic field formed by magnet in the sleeve. Said coil is round the outer of piston evenly. The invention also provides a vehicle suspension system with energy recovery, comprising damper unit, control cell and battery. Said damper unit comprises multiple dampers with energy recovery provided in the invention. The damper with energy recovery provided in the invention can realize the generation of energy recovery voltage by the principle of DC line generator so as to transform the mechanical vibration energy into electrical energy. The vehicle suspension system with energy recovery provided in the invention can realize adaptive control to damper and the control is relatively simple. The energy usage is improved.

The invention relates to a double-barrel-structure magneto-rheological shock absorber based on a flow mode. The double-barrel-structure magneto-rheological shock absorber comprises an outer cylinder barrel and an inner cylinder barrel which is installed in the outer cylinder barrel, wherein a gap is formed between the outer cylinder barrel and the inner cylinder barrel, the upper end and the lower end of each of the outer cylinder barrel and the inner cylinder barrel are respectively sealed to a base through an end cover, through holes are formed in the circumferential wall of the lower end of the inner cylinder barrel, an inner cavity of the inner cylinder barrel is communicated with the gap between the inner cylinder barrel and the outer cylinder barrel through the through holes, a piston is arranged in the inner cavity of the inner cylinder barrel, the piston is fixedly connected with a piston rod, one end of the piston rod is fixedly connected with the piston, the other end of the piston rod stretches out of the end cover, a through hole which is used for the piston rod to run through is formed in the end cover, the space between the piston and the base in the inner cavity of the inner cylinder barrel is filled with magneto rheological liquid, a magnetic field adjusting device is fixed on the base, and a conducting wire of the magnetic field adjusting device is led out from a leading-out hole formed in the base. By adopting the double-barrel-structure magneto-rheological shock absorber, the working stroke of the shock absorber is increased, the application range of the shock absorber is enlarged, and the dissipation of the working heat of the shock absorber in long time can be facilitated.

The invention discloses a cylindrical electromagnetic damper which comprises a centre shaft, wherein n groups of annular permanent magnet stacks with opposite same polarities are sequentially arranged along an axial direction on the outer wall of the centre shaft; n is an integer more than or equal to 2; ferromagnetic gaskets are arranged among the annular permanent magnet stacks; the two ends of the annular permanent magnet stacks along the axial direction of the centre shaft are locked on the centre shaft through a first lock nut and a second lock nut; outer thin wall cylinders are arranged outside the annular permanent magnet stacks, and a gap a gap is arranged between the outer thin wall cylinders and the annular permanent magnet stacks, and a first cover body and a second cover body are fixed on the two ends of the outer thin wall cylinders and in the radical direction of the outer wall of the centre shaft. Preferably, inner thin wall cylinders are arranged between the annular permanent magnet stacks and the outer thin wall cylinders, wherein the inner thin wall cylinders are fixed with the two ends of the inner thin wall cylinders and the center shaft; a plurality of lug bosses at equal intervals are arranged on the outer walls of the inner thin wall cylinders in the axial direction, and a magnetic coil is wound among the lug bosses. By adopting the structure of the cylindrical electromagnetic damper disclosed by the invention, higher electromechanical coupling characteristics as well as vibration isolating and buffering characteristics are provided, and the advantages of simple structure, large operation force, convenience for use, low cost and wide application range are achieved.

The invention relates to a double-barrel-structure magneto-rheological shock absorber based on a flow mode. The double-barrel-structure magneto-rheological shock absorber comprises an outer cylinder barrel and an inner cylinder barrel which is installed in the outer cylinder barrel, wherein a gap is formed between the outer cylinder barrel and the inner cylinder barrel, the upper end and the lower end of each of the outer cylinder barrel and the inner cylinder barrel are respectively sealed to a base through an end cover, through holes are formed in the circumferential wall of the lower end of the inner cylinder barrel, an inner cavity of the inner cylinder barrel is communicated with the gap between the inner cylinder barrel and the outer cylinder barrel through the through holes, a piston is arranged in the inner cavity of the inner cylinder barrel, the piston is fixedly connected with a piston rod, one end of the piston rod is fixedly connected with the piston, the other end of the piston rod stretches out of the end cover, a through hole which is used for the piston rod to run through is formed in the end cover, the space between the piston and the base in the inner cavity of the inner cylinder barrel is filled with magneto rheological liquid, a magnetic field adjusting device is fixed on the base, and a conducting wire of the magnetic field adjusting device is led out from a leading-out hole formed in the base. By adopting the double-barrel-structure magneto-rheological shock absorber, the working stroke of the shock absorber is increased, the application range of the shock absorber is enlarged, and the dissipation of the working heat of the shock absorber in long time can be facilitated.

The invention discloses an oscillating type magnetorheological damper which is formed by the means that a damping rod is arranged in a damping pipe, wherein the damping pipe is combined and fixed into a whole by the means that N+1 ring-shaped damping fins and N spacer rings are concentrically overlapped with one another one by one in the plane; each ring-shaped damping fin consists of a ring-shaped electromagnet and magnetorheological elastomers, wherein at least three pairs of magnetic poles of the ring-shaped electromagnet are uniformly distributed at the inner periphery, and the nagnetioreological elastomers with the same thickness are respectively fixed on the end surface of each magnetic pole of the ring-shaped electromagnet; each spacer ring is made from non-magnetic permeability material, the outer diameters of the spacer rings are as the same as those of the ring-shaped damping fins, and the inner diameters of the spacer rings are not less than those of the magnetic poles of the ring-shaped electromagnets; and the damping rod is in the shape of a cylinder which is made from high-magnetic permeability material, and the length of the damping rod is not less than that of the damping pipe.

The invention relates to a main die rotary type high-speed cold heading machine. A cold heading device further comprises a main die rotary mechanism, wherein the main die rotary mechanism comprises a rotary type main die seat; the main die seat is assembled on a machine body and can rotate; the main die seat is sequentially provided with a plurality of heading working stations corresponding stamping dies one by one, and a material returning working station corresponding to the position of a material returning device; the material returning working station and the heading working stations are uniformly distributed on the same circumference; each working station of the main die seat is correspondingly provided with a main die; the main die seat is connected with an interval indexing device for driving the main die seat to rotate at interval to realize the switching of the working stations of the main die; each stamping die is positioned and mounted on a stamping die slide seat and corresponds to the position of the corresponding cold heading working station. The switching of the working stations is realized by main die rotation; the main die rotary type high-speed cold heading machine has the advantages of compact structure, good production stability, high machining precision and high working efficiency.

The invention discloses a double-rod magnetorheological elastomer damper, which comprises two damping rods, a damping block, four damping rollers and a working cylinder. The cross section of an inner cavity of the working cylinder is rectangular, baffle plates are fixed to two ends of the working cylinder, a hole is arranged in the middle of each baffle plate, a sliding bearing is fixed into each hole, and a magnetorheological elastomer is fixed to the surface of each of two short inner edges of the working cylinder. The longitudinal section of the damping block is I-shaped, an excitation coil is wound in the middle of the damping block, the end faces of four branches of the I-shaped damping block are respectively provided with a semicircular groove, the axis line of each groove is perpendicular to that of each damping rod, and the diameter of each groove is larger than that of each damping roller. The damping rollers are mounted in the semicircular grooves on the end faces of the four branches of the I-shaped damping block, one end of one damping rod and one end of the other damping rod are fixed to two ends of the damping block respectively, the other ends of the two damping rods extend out of the working cylinder respectively through the sliding bearings on the baffle plates at the two ends of the working cylinder.

The invention relates to a clamping device having mechanical damping for a traction engine drive, having a fixed, bowl-shaped base part (6) and a clamping roller carrier (1) having at least one clamping roller (2) and rotatably supported by a sliding bearing (4) on a centrally disposed bearing spindle (5) by means of a hub-shaped bearing part (3), wherein the clamping roller carrier (1) is pretensioned against the base part (6) by means of a torsional spring (9) disposed in the ring space (8) formed between the inner contour of the wall (7) of the bowl-shaped base part (6) and the hub-shaped bearing part (3) of the clamping roller carrier (1) and concentrically encompassing the bearing part (3). Furthermore, according to the invention, the torsional spring (9) in said clamping device is designed as a tabless spring on at least one end thereof, and supports itself by means of the at least one tabless spring end on a first frictional element (11) in the form of a brake shoe, and by means of the other spring end on a bowl-shaped base part (6) of the clamping device, wherein the first frictional element (11) is pivotally supported on the clamping roller carrier (1) by means of a leverarm (12) extending in turn through a cutout (13) in the wall (7) of the base part (6) and is pressed by the spring force by means of the torsional spring (9) against the inner contour of the wall (7)of the bowl-shaped base part (6).

The invention discloses a double-outlet rod magnet rheologic elastic body damper, which comprises two damping rods, a damping block, two damping rollers and a working cylinder, wherein the cross section of an inner cavity of a working cylinder is rectangular; baffles are fixed at both the two ends of the working cylinder; a hole is formed in the middle of each baffle; sliding bearings are fixed in the holes; a layer of magnet rheologic elastic body is fixed on the surface of each of two short sides in the working cylinder; the section of the damping block is I-shaped; a magnet exciting coil is wound in the middle of the damping block; a semi-circular groove is arranged in each middle of the two ends of the damping block; central axles of the grooves are perpendicular to central axes of the damping rods; diameters of the grooves are greater than diameters of the damping rollers; the damping rollers are arranged in the semi-circular grooves at the both ends of the damping block; one end of each two damping rods is fixed at the two ends of the damping block, respectively; and the other end of each two damping rods stretches out from inner side of the working cylinder through the sliding bearings on the baffles at the both ends of the working cylinder, respectively.

The invention discloses a semi-active shock absorber. The semi-active shock absorber comprises an oil cylinder assembly, a connecting rod piston assembly, a bottom valve assembly and a digital proportional valve, wherein a main valve assembly is provided with a first oil way and a second oil way; the oil inlet end of the first oil way and the oil inlet end of the second oil way communicate with amiddle cavity; the oil outlet end of the first oil way and the oil outlet end of the second oil way communicate with an oil storage cavity; when a coil assembly is not powered on, the first oil way isin a connected state, the second oil way is in a disconnected state, and the middle cavity communicates with the oil storage cavity through the first oil way; and when the coil assembly is powered on, an armature push rod assembly blocks the first oil way, the first oil way is in a disconnected state, and the middle cavity communicates with the oil storage cavity through the second oil way. The digital proportional valve is adopted for adjusting and controlling the throttling area of shock absorber oil liquid, and the damping force of the shock absorber is adjusted; and by controlling the duty ratio of input signals, the throttling area of the proportional valve can be continuously and freely adjusted, and the damping force of the shock absorber is continuously adjusted and controlled.

The invention discloses a magnetorheological elastomer damper with a single rod extending out, which comprises a damping rod, a damping block, four damping wheels and a working cylinder. The cross section of an inner cavity of the working cylinder is rectangular, retaining plates are fixed at two ends of the working cylinder, a sliding bearing is fixed in a hole arranged in the middle of one of the retaining plates, and magnetorheological elastomer layers are respectively fixed on surfaces of two short inner edges of the working cylinder. The longitudinal section of the damping block is H-shaped, an excitation coil is wound in the middle of the H-shaped damping block, end faces of four branches of the H-shaped damping block are respectively provided with a semicircular groove, the axis of the grooves are perpendicular to the axis of the damping rod, and the diameter of the grooves is larger than that of the wheels. The damping wheels are mounted in the semicircular grooves on the end faces of the four branches of the H-shaped damping block. One end of the damping rod is fixed with the H-shaped damping block, and the other end of the damping block extends out of the working cylinder through the sliding bearing on the retaining plate at one end of the working cylinder.

The invention discloses a three-dimensional swinging type magnetorheological damper, which comprises electromagnets and magnetorheological elastomers, wherein the electromagnet and the magnetorheological elastomer are both annular. The three-dimensional swinging type magnetorheological damper is integrated by fixedly combining N+1 annular electromagnets and N annular magnetorheological elastomers in a mode that one electromagnet and one magnetorheological elastomer plane are connected in an overlaying mode. The outer diameter of each electromagnet is smaller than that of each magnetorheological elastomer, and the inner diameter of each electromagnet is not bigger than that of each magnetorheological elastomer.

The invention relates to the technical field of shock absorbers, in particular to a piston mechanism and a hydraulic shock absorber. The piston mechanism comprises a piston rod, an electromagnetic valve assembly, a sliding valve and a rebuilt valve system, the piston rod is inserted into a working cylinder of the hydraulic shock absorber, the two ends of the electromagnetic valve assembly are connected with the piston rod and the rebuilt valve system respectively, the rebuilt valve system divides the working cylinder into a rod cavity and a rodless cavity, the sliding valve is located in a containing cavity formed by the rebuilt valve system and the electromagnetic valve assembly and divides the containing cavity into a first cavity and a second cavity, when the electromagnetic valve assembly is electrified, a first valve port and a second valve port of the electromagnetic valve assembly communicate, so that the first cavity communicates with the rod cavity through the electromagnetic valve assembly, a second through hole used for communicating the second cavity with the rod cavity is formed in the side wall of the second cavity, and the slide valve can shield the second through hole. The pressure of the first cavity is adjusted by adjusting the opening degree of the electromagnetic valve assembly so that the opening degree of the sliding valve can be adjusted, and then the damping force generated when oil passes through the rebuilt valve system can be adjusted.

The invention discloses an adjustable pop-up ground socket. The adjustable pop-up ground socket comprises a panel, a pop-up frame, a function member and a damping device, the damping device is fixed under the panel, the damping device comprises a pop-up base fixed under the panel, the pop-up base is provided with an installing hole, a damper tube, an adjusting member and a rotating shaft are arranged in the installing hole, the adjusting member is arranged at one side of the damper tube, the rotating shaft is arranged at the other side of the damper tube, the damping device is pivoted to the pop-up frame through the adjusting member, the damper tube is in sealing fit with the adjusting member and the rotating shaft to form a cavity used for filling in damping oil, and a spring is arrangedin the cavity. When a damping force needs to be adjusted, the adjusting member is rotated to drive the spring to rotate to change the initial torsion of the spring, the adjustment of the damping forceis realized, and the time for the pop-up of the pop-up frame is adjusted.

The invention discloses a magneto-rheological elastic body annular-membrane-type damper. The magneto-rheological elastic body annular-membrane-type damper comprises a working cylinder, a damping rod, two annular damping membranes, two annular damping sheets, an annular iron plate and two single-face annular electromagnets, wherein the working cylinder is composed of a circular pipe and the two single-face annular electromagnets, at least four pairs of magnetic poles are evenly distributed on one circular ring face of each single-face annular electromagnet, and a magnet exciting coil is wound on each magnetic pole; the annular iron plate is fixed on the inner circumference of the circular pipe, between the two single-face annular electromagnets, inside the working cylinder, the two annular damping membranes are composed of magneto-rheological elastic bodies, the outer circumferences of the two annular damping sheets are fixed on the inner circumferences of the two annular damping membranes respectively, and the outer circumferences of the two annular damping membranes are fixed on the inner circumference, between the two single-face annular electromagnets and the annular iron plate, of the circular pipe respectively in parallel; one end of the damping rod penetrates through two middle holes of the two annular damping sheets and is fixed with the two middle holes of the two annular damping sheets, and the other end of the damping rod extends out of the working cylinder via a sliding bearing on one of the single-face annular electromagnets.

The invention relates to a three-linkage screen. The three-linkage screen comprises a door frame, a first movable door, a second movable door, a third movable door and a linkage assembly, the first movable door and the second movable door are installed on the door frame in a sliding mode, the linkage assembly comprises an installation piece arranged at the top of the second movable door, a dampingpiece wound on the outer side of the installation piece and a first positioning piece arranged on the side, facing the second movable door, of the first movable door, and the first positioning pieceabuts against the damping piece. The three-linkage screen has the effect of reducing the probability that the first movable door and the second movable door are damaged in the rapid moving process.

The invention provides a turbine damper used for blocking drones, belonging to the technical field of drone blocking, comprising: a turbine damper body; a brake pulley, which is connected to the turbine damper body and used for winding the brake strip; , set on the brake pulley, used to pull out one end of the brake belt towards the outside of the brake pulley, and by pulling the brake belt in or out from the pull-out slot, to adjust the brake belt that can be placed on the brake pulley. Length; by adjusting the length of the brake belt on the brake pulley, the winding radius on the brake pulley is changed, and the damping force on the brake belt can be adjusted under different working conditions, so that the turbine damper can be applied to different working conditions. The blocking of drones; when the brake belt is wound and pulled out, the pull-out seam plays a fixed role to prevent slippage between the brake belt and the brake pulley; in special cases, the excess brake belt can be drawn in again through the pull-out seam Avoid the danger of deadlifting the drone.

The invention provides an impeller washing machine and an adjustable damping suspender thereof. The adjustable damping suspender comprises a suspender part and a sleeve, a first magnetic component and a second magnetic component, wherein a top installing base is arranged at the top end so that the suspender part can be suspended on a suspending base at the top of a shell of the impeller washing machine, the bottom end of the suspender part is sleeved with the suspender part in a sliding mode, the first magnetic component is arranged on the suspender part, the second magnetic component is arranged on the sleeve, and the first magnetic component and the second magnetic component are arranged at an interval so that mutual magnetic force between the first magnetic component and the second magnetic component can change along with relative motion displacement between the sleeve and the suspender part in the axial direction. According to the adjustable damping suspender, action force corresponding to the distance between the first magnetic component and the second magnetic component is exerted on the first magnetic component and the second magnetic component according to the relative motion displacement between the sleeve and the suspender part in the axial direction to adjust damping force of the adjustable damping suspender.

The invention relates to and provides a crawling-resistant absorber. The crawling-resistant absorber comprises a first cylinder, a second cylinder, an oil guide pipe, a first one-way valve assembly, asecond one-way valve assembly and a damping assembly. A first cylinder cavity is formed in the first cylinder and embedded into the first cylinder, and a second cylinder cavity is formed between thefirst cylinder and the second cylinder. The first one-way valve assembly is in sliding connection with the inner wall of the first cylinder cavity and separates the first cylinder cavity into a firstchamber and a second chamber. The oil guide pipe is arranged in the second cylinder, and is used for communicating with the first chamber and the second chamber. The second one-way valve assembly is arranged between the second cylinder cavity and the second chamber. The damping assembly is arranged at the end, relatively close to the second chamber, in the second cylinder, one end of the damping assembly communicates with the first chamber, and the other end of the damping assembly communicates with the second cylinder cavity. The damping assembly is used for communicating with the first chamber and the second cylinder cavity when the oil pressure is larger than damping force. The invention further relates to a bogie and a railway vehicle. According to the crawling-resistant absorber, thebogie and the railway vehicle, the damping force can be adjusted without demounting the absorber, and the process is simple and convenient.

The invention provides a multiform mechanical vibration damper. The multiform mechanical vibration damper comprises a torsional vibration vibration-absorption mounting flange, a four-leg chuck, an upper box body, a sector-shaped piston, a linear vibration vibration-absorption mounting rod and a lower box body, wherein the sector-shaped piston is mounted in the upper box body and the lower box body; the upper box body is fixedly connected with the lower box body; the torsional vibration vibration-absorption mounting flange is mounted on the four-leg chuck; the linear vibration vibration-absorption mounting rod is mounted on the sector-shaped piston by the lower box body; the four-leg chuck is mounted in the sector-shaped piston and penetrates through the linear vibration vibration-absorption mounting rod. The multiform mechanical vibration damper realizes the vibration-absorption effects of two vibration forms including linear vibration and torsional vibration, and has the advantages of simple structure, high energy absorption efficiency, wide application range, strong flexibility, convenience for installation and the like.

The invention discloses a piston rod assembly which comprises a piston rod, an adjustable bolt and a valve needle. At least one through hole is formed in the piston rod; the adjustable bolt is arranged in the piston rod; a channel is arranged in the adjustable bolt and communicates with the through hole in the piston rod; the valve needle is arranged at one end of the adjustable bolt; one end, faraway from the adjustable blot, of the valve needle is fixedly connected with a valve rod; one end, far away from the valve needle, of the valve rod is connected with an adjustable rod; and the adjustable rod is in threaded connection with the piston rod. Through adjusting a gap between the valve needle and the adjustable bolt, a specific value of a damping force is adjusted through controlling the oil capacity, so that the shock absorber can adapt to different road conditions, and the comfort in driving is realized.

The invention provides an underwater energy dissipation and seismic mitigation device with double umbrella surfaces symmetrical in the horizontal direction, and belongs to the technical field of structural vibration control. The underwater energy dissipation and seismic mitigation device is mainly applied to vibration control of an ocean platform. The underwater energy dissipation and seismic mitigation device comprises a piston rod, a damping cylinder body, a cover plate, a piston, a damping medium, a hinge device, a strut fixing device, a strut and a square blade plate. The energy dissipation and seismic mitigation device is provided with a plurality of energy dissipation systems, when an external structure connected with the energy dissipation and seismic mitigation device vibrates horizontally, the damping cylinder body is fixed, so that when the piston rod moves, the strut fixing device is driven to move, so that the strut is driven to move, the square blade plate is driven by thestrut to slide in water, and certain damping force is provided through counter-acting force provided by the water. In addition, the external structure vibrates to drive the piston rod of the device to axially move, so that the piston is driven to slide in the cylinder body, and viscous damping force is generated. The underwater energy dissipation and seismic mitigation device has good underwaterenergy dissipation capacity, and is flexible and efficient.

The invention relates to a clamping device having mechanical damping for a traction engine drive, having a fixed, bowl-shaped base part (6) and a clamping roller carrier (1) having at least one clamping roller (2) and rotatably supported by a sliding bearing (4) on a centrally disposed bearing spindle (5) by means of a hub-shaped bearing part (3), wherein the clamping roller carrier (1) is pretensioned against the base part (6) by means of a torsional spring (9) disposed in the ring space (8) formed between the inner contour of the wall (7) of the bowl-shaped base part (6) and the hub-shaped bearing part (3) of the clamping roller carrier (1) and concentrically encompassing the bearing part (3). Furthermore, according to the invention, the torsional spring (9) in said clamping device is designed as a tabless spring on at least one end thereof, and supports itself by means of the at least one tabless spring end on a first frictional element (11) in the form of a brake shoe, and by means of the other spring end on a bowl-shaped base part (6) of the clamping device, wherein the first frictional element (11) is pivotally supported on the clamping roller carrier (1) by means of a lever arm (12) extending in turn through a cutout (13) in the wall (7) of the base part (6) and is pressed by the spring force by means of the torsional spring (9) against the inner contour of the wall (7) of the bowl-shaped base part (6).

The invention discloses a multi-station garment embossing machine for garment equipment, which relates to the technical field of garment processing, in order to solve the problem of low efficiency. The multi-station garment embossing machine for the garment equipment specifically includes a worktable, a conveying mechanism, an embossing mechanism, and an adjustable damping material guiding mechanism; the worktable is fixed to the ground by device legs, and the inner wall of the worktable is provided with a conveying groove, a tensioning groove and a material guiding groove respectively; the conveying mechanism is arranged at a position of the worktable close to the conveying groove; the adjustable damping material guiding mechanism is arranged at a position of the worktable close to the material guiding groove; and the embossing mechanism is arranged on the top outer wall of the worktable. When the multi-station garment embossing machine for the garment equipment is in use, one end ofthe garment is fixed by the adjustable damping material guiding mechanism, and then pulled between a lower mold and an upper mold in a parallel manner, and finally fixed by the conveying mechanism; and the conveying mechanism cooperates with the adjustable damping material guiding mechanism to complete the loading and unloading of garment during the entire work process without manual intervention,which greatly improves the efficiency of embossing, thereby reducing the increase in clothing cost.

The invention provides a multiform mechanical vibration damper. The multiform mechanical vibration damper comprises a torsional vibration vibration-absorption mounting flange, a four-leg chuck, an upper box body, a sector-shaped piston, a linear vibration vibration-absorption mounting rod and a lower box body, wherein the sector-shaped piston is mounted in the upper box body and the lower box body; the upper box body is fixedly connected with the lower box body; the torsional vibration vibration-absorption mounting flange is mounted on the four-leg chuck; the linear vibration vibration-absorption mounting rod is mounted on the sector-shaped piston by the lower box body; the four-leg chuck is mounted in the sector-shaped piston and penetrates through the linear vibration vibration-absorption mounting rod. The multiform mechanical vibration damper realizes the vibration-absorption effects of two vibration forms including linear vibration and torsional vibration, and has the advantages of simple structure, high energy absorption efficiency, wide application range, strong flexibility, convenience for installation and the like.

The invention discloses an energy recovery damping stepper in the technical field of fitness equipment and its use method. A housing with an accommodating cavity is rotatably connected, a rack is rotatably connected below the end of the foot pedal facing the rear, the rack is slidably connected in the housing, and a connecting shaft is rotatably connected to the housing below the rack. and the connecting shaft two, the connecting shaft one is connected with the boss gear one and the boss gear two arranged at intervals in the axial direction, the connecting shaft two is connected with the boss gear three, and the boss gear two and the boss gear three mesh , Boss gear 1 and boss gear 3 mesh with the rack respectively, boss gear 1 is connected to connecting shaft 1 via one-way bearing 1, boss gear 2 is connected to connecting shaft 1 via one-way bearing 2, and boss gear 3 is connected to connecting shaft 1 via one-way bearing 1. The one-way bearing three is connected with the connecting shaft two; the invention can reduce energy loss.

The application relates to a shock absorber with variable damping according to the strength of the road surface, belonging to the technical field of automobile shock absorbers, including: a working cylinder with a piston and a piston rod inside, and the piston divides the working cylinder into an upper chamber and a lower chamber One end of the piston rod is connected with the piston and drives the piston to reciprocate in the working cylinder; the plunger rod moves inside the piston rod, the piston rod is provided with a first channel, and the plunger rod is provided with a second channel, when the plunger When the rod moves to a set position in the piston rod, the upper chamber and the lower chamber communicate through the first passage and the second passage. In the shock absorber of the present application, a plunger rod is added in the piston rod, and the plunger rod moves adaptively in the piston rod according to different road conditions and driving states of the vehicle to adjust the damping force of the shock absorber. The plunger rod of the present application is a passive adjustment element, which can adaptively adjust the damping force of the shock absorber without external control, improves the reliability of the shock absorber, and reduces the manufacturing cost.