1149 results about "Gas spring" patented technology

The invention discloses a tool for assembling an air spring sealing assembly, and the tool is characterized in that the tool comprises a positioning mechanism which is used for positioning and fixing an air spring body; the press fitting mechanism comprises a guide sleeve and a pressure head; the guide sleeve is provided with a vertically-through guide cavity, and the guide sleeve is driven by a first driving piece to move up and down and can cover the mounting end part in the down stroke; the pressure head is coaxially arranged above the guide sleeve, and is driven by a second driving piece to independently move up and down; the clamp spring guide-in seat is arranged at the top of the guide sleeve, a guide-in cavity penetrating up and down is formed in the clamp spring guide-in seat, and the guide-in cavity is coaxially communicated with the guide cavity; and the snap spring pre-tightening mechanism is used for performing radial extrusion on the snap spring placed at the port position of the guide-in cavity, so that the snap spring falls into the guide-in cavity after being tightened. The press-fitting device has the advantages that the press-fitting of the sealing cover and the snap spring is combined in one step, the problems of deflection, popping and the like of the snap spring in the assembling process are effectively solved, operation is simple and safe, and assembling efficiency is high.

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim to provide a gas suspension for relative movement between the inner rim and the outer rim. Each of the gas springs may have a controllable gas pressure. The wheel assembly also includes a wheel rotational position sensor, a vehicle operator control input interface, and a controller configured to control the gas pressure in each of the gas springs in a pattern in response to the wheel rotational position sensor and vehicle operator control input interface to assist in one of overcoming a rolling resistance of the wheel and a braking of the wheel.

A truck bed mounted carrier system includes a frame assembly installable in a truck bed with lateral supports and outer main supports, inner supports that slide within the outer main supports, a center outer support, and a second inner support that slides within the center outer support. A carrier frame coupled to the frame assembly extends from and retracts into the truck bed, supported by radius supports that provide structural integrity when extended. The system features a pulley assist mechanism with gas springs that creates a counterbalance force, a mechanical drive assembly with sprocket and roller chain for movement control, and deployable transport stands for ground support during loading operations. Adjustable bed rail struts with locking mechanisms secure the system to the truck bed without permanent modification. Low-friction materials and strategically positioned slides ensure smooth operation throughout the extension and retraction cycles.

The invention discloses a broken sample anti-adhesion and waste taking device and method under an automatic mode of a tensile testing machine, and relates to the technical field of tensile testing machines. The clamp comprises a clamp body, a horizontal pushing type driving mechanism, a clearance, a gas spring ejection mechanism, a manipulator and a control system. A gap (delta = 30mm) is reserved to form a manipulator operation window, so that the problem of failure in grabbing of the fractured sample is solved; the gas spring ejection mechanism pushes the ejection head to extend out by 3mm with the thrust of 20N, and the adhered sample is forcibly separated; the clamping force of the horizontal pushing type driving mechanism reaches 30 MPa, and the maximum opening stroke exceeds 100 mm. All the components are coordinated through a PLC, the processes of sample feeding, tensile sample breaking treatment and separation and recovery are completed, the clamping face state is detected in real time through a laser obstacle avoidance sensor, and operation safety is guaranteed. Manual intervention is eliminated, the automatic compatible defect is overcome, and the automatic testing efficiency of the tensile testing machine is improved.

The automatic assembling device comprises a rack, a first feeding mechanism, a second feeding mechanism and an assembling mechanism, the first feeding mechanism horizontally supplies piston rods through a storage box and a material taking table, the second feeding mechanism supplies pistons through a rotating disc, and the assembling mechanism comprises a linear module, a taking part and a riveting part. A piston rod is taken, placed and rotated through the electric clamping jaw, riveting assembly with a piston is completed through the hydraulic cylinder, so that the assembly efficiency is improved, the driving mode is optimized, rotation of the material taking table, overturning of the clamping jaw and indexing of the rotary table are driven in a linkage mode through linear motion of the motion table, independent driving sources are reduced, and reliability is improved.

The invention provides a bridge self-adaptive multi-dimensional vibration reduction support device and a working method, relates to the field of bridges, and aims to solve the technical problems that an existing bridge vibration reduction device is difficult to consider multi-dimensional vibration control and adjustment depends on an external power supply. Vibration mechanical energy is converted into magnetic field energy to act on magnetorheological fluid, a self-adaptive vertical damping adjusting mechanism which does not need external energy and has stronger vibration and larger damping is constructed, and rolling friction energy consumption of friction balls in the transverse vibration reduction assembly and displacement constraint of a limiting ring are combined, so that the vibration reduction effect is improved. The multi-dimensional control over the vertical direction, the horizontal direction and the torsion is achieved through the combined deformation energy dissipation of a vibration reduction spring and a limiting cable in the torsion vibration reduction assembly, the problems that a traditional bridge vibration reduction support is single in function, cannot be adjusted in a self-adaptive mode and fails in power failure are effectively solved, and the anti-vibration safety and the operation stability of the structure in the complex power environment are improved.

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle, an outer rim surrounding the inner rim. A rigid cover ring may be coupled to the outer rim and extend radially inward toward the inner rim. Gas springs may be operatively coupled between the inner and outer rims to provide a gas suspension for relative movement between the inner and outer rims. Fastener assemblies fasten the rigid cover ring to the outer rim, fastening each gas spring to the outer rim, or fastening each gas spring to the outer rim. Each fastener assembly may include a fastener and a pair of indicator-lock washers carried by the fastener. Each indicator-lock washer may have respective sloped surfaces slidably engaging one another to permit relative rotation so that loosening from a fully tightened position exposes a gap.

The automatic feeding device and method for integrated air spring molding described in this invention proposes a feeding and calibration device specifically for platform-type molding machines. This device achieves directional feeding through continuous, automated control of sheet loading and calibration positioning, enabling sheet introduction and placement without manual intervention or assistance. This approach aims to automate the air spring molding process, improve the bond density of the preform, and enhance the performance of the air spring. The automatic feeding device for integrated air spring molding includes a suction assembly driven by a six-axis robot to oscillate the transfer fabric, as well as a visual inspection and positioning assembly.

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle, an outer rim surrounding the inner rim, and gas springs operatively coupled between the inner and outer rims to provide a gas suspension for relative movement between the inner and outer rims. The wheel assembly may also include tread assemblies carried by the outer rim. Fastener assemblies may be configured to perform fastening at least one tread assembly to the outer rim, fastening each gas spring to the outer rim, or fastening each gas spring to the outer rim. Each fastener assembly may include a fastener, and a pair of indicator-lock washers carried by the fastener. Each indicator-lock washer may have respective sloped surfaces slidably engaging one another to permit relative rotation so that loosening from a fully tightened position exposes a gap therebetween.

The invention discloses a power-on self-test method and system for a closed air suspension system, and the method comprises the steps: starting self-test after receiving a vehicle power-on signal, opening an air path switching valve RV2 and an air escape valve VV, enabling a pressure sensor pipeline to be communicated with the atmosphere, and generating an initial air path detection result; based on the initial gas path detection result, closing a gas release valve VV and opening a gas path switching valve RV1 to enable a pressure sensor pipeline to be communicated with the gas storage tank, and generating a gas path detection result of the gas storage tank; on the basis of the air storage tank air path detection result, an air path switching valve RV1 is closed, all air spring distribution valves ASV1 to ASV2 are sequentially opened, and an air spring detection result is generated; and on the basis of the air spring detection result, all the distribution valves are closed, the air path switching valve RV2 is opened, the air pump is started, a pressure value is read after waiting for a preset time T4, when the pressure value is larger than a threshold P7, it is judged that the air pump is normal, and a system self-inspection result is generated. According to the embodiment of the invention, comprehensive self-inspection of the system can be quickly completed when the vehicle is powered on, and the reliability of the vehicle is improved.

The application provides an air suspension system and a vehicle. The air suspension system comprises a first air spring, a second air spring and a gas storage component, and further comprises: a first electromagnetic switch valve connected to the first air spring; a second electromagnetic switch valve connected to the second air spring; a third electromagnetic switch valve connected between the first electromagnetic switch valve and the gas storage component; and a fourth electromagnetic switch valve connected between the second electromagnetic switch valve and the gas storage component. When the first electromagnetic switch valve, the second electromagnetic switch valve, the third electromagnetic switch valve and the fourth electromagnetic switch valve are all powered on, the first electromagnetic switch valve and the third electromagnetic switch valve form a first gas path with the gas storage component, the second electromagnetic switch valve and the fourth electromagnetic switch valve form a second gas path with the gas storage component, the gas storage component inflates the first air spring through the first gas path, and the gas storage component inflates the second air spring through the second gas path, so that the body height of the front axle and the rear axle of the vehicle can be synchronously lifted.

Disclosed is a coarse positioning apparatus for a stage apparatus, the coarse positioning apparatus comprising: at least one gas spring, each said at least one gas spring comprising a piston; and at least one electromagnetic actuator; wherein said at least one gas spring and said at least one electromagnetic actuator are operable to each apply respective complementary forces to said stage apparatus so as to accelerate said stage apparatus for coarse positioning of said stage apparatus, and wherein at least said gas spring is coupled to said stage apparatus throughout each full stroke of said stage apparatus.

An adjustable workstation includes a tabletop having opposed upper and lower surfaces, a leg for supporting the tabletop, a gas spring having opposed spring front and rear ends, and a tabletop mount affixed to an upper end of the leg and pivotably coupled to the lower surface of the tabletop at a tilt axis. The spring front end is pivotably coupled to the lower surface of the tabletop. The spring rear end is pivotably coupled to the mount at an elevation lower than the tilt axis. The tabletop pivots in a first direction about the tilt axis upon extension of the gas spring to raise a front edge of the tabletop relative to a rear edge of the tabletop. The tabletop pivots in a second direction about the tilt axis upon retraction of the gas spring to lower the front edge of the tabletop relative to the rear edge of the tabletop.

The invention discloses a double-energy-storage type hydro-pneumatic spring integrated damping suspension hydraulic cylinder and a vehicle. The double-energy-storage type hydro-pneumatic spring integrated damping suspension hydraulic cylinder comprises a mounting cylinder bottom, a suspension cylinder and an energy accumulator. An oil passing channel is formed in the mounting cylinder bottom, and a first communicating opening and two second communicating openings are formed in the mounting cylinder bottom. The suspension cylinder and the energy accumulators are both fixedly installed on the installation cylinder bottom, the two sets of energy accumulators are arranged and located on the two sides of the suspension cylinder in the radial direction respectively, the suspension cylinder and the energy accumulators are communicated with the oil passing channel through the first communication opening and the second communication opening respectively, and the suspension cylinder and the energy accumulators are communicated through the oil passing channel. The problem of pressure loss caused by a lengthy oil way of a traditional suspension system is effectively solved, and internal transmission of the oil way is achieved through integrated installation of the cylinder bottom. The double energy accumulators are symmetrically arranged to form a redundant pressure compensation mechanism, and the pressure stability of the system under the continuous vibration working condition is ensured. The overall structure is compact in design, occupied space is reduced, and the requirement for miniaturization of a suspension system of a special vehicle is met.

The invention discloses a pressing rivet die and method for CNC machining of a water cooling plate, the pressing rivet die comprises an upper die assembly and a lower die assembly, the upper die assembly comprises an upper clamping plate and a stop plate which are arranged at intervals, and a stripper plate is arranged on the lower end face of the stop plate; a nitrogen spring is arranged between the upper clamping plate and the stop plate, and one end of the nitrogen spring abuts against the stop plate. The nitrogen spring comprises a cylinder body, a piston rod and an air pressure adjusting channel communicated with the cylinder body. A first pressure sensor is arranged on the upper clamping plate, and a displacement sensor used for monitoring rivet press-in displacement is arranged on the stop plate or the stripper plate. In the running process, the upper die assembly is driven to move downwards, the nitrogen spring arranged between the upper clamping plate and the stopping plate is driven to be pressed step by step to apply uniform elastic pressure to the rivet, flexible rivet pressing is achieved, the first pressure sensor and the displacement sensor feed back the pressing-in displacement amount of the rivet in real time, feedback correction of the riveting process is achieved, and the riveting precision is improved. And offset or damage caused by hard contact is avoided.

The utility model discloses a gas spring which comprises a cylinder barrel, a piston rod and a piston assembly. The piston assembly is arranged at the first end of the piston rod and divides the cylinder barrel into a first cavity and a second cavity, the piston assembly comprises a first piston piece, a second piston piece and a sealing ring, the first piston piece comprises a first component and a second component, and the sealing ring is arranged on the second component in a sleeving mode and located between the first component and the second piston piece. The first component is provided with a first flow channel, a second flow channel is formed between the outer edge of the second component and the inner wall of the cylinder barrel, the first flow channel communicates with the first cavity and the second flow channel, a first labyrinth groove is formed among the first piston piece, the second piston piece and the piston rod, the second piston piece is provided with a throttling hole, and the two ends of the first labyrinth groove communicate with the first cavity and the throttling hole correspondingly. The throttling hole is communicated with the second cavity. According to the gas spring, the resistance in the stretching process can be changed according to the external force, so that the use experience of a user when the gas spring is applied to doors and windows for buffering is improved.

The invention relates to the technical field of spring detection equipment, and discloses a tensile strength testing device for air spring production, the tensile strength testing device comprises a main body structure, a tensile structure is detachably mounted on the main body structure, and suspension structures are symmetrically arranged on the tensile structure. Detection accuracy, adaptation flexibility and operation safety are considered, high air leakage detection accuracy is achieved, different specification test requirements are met, personnel operation safety can be guaranteed, through a stretching structure, test scene suitability and data detection comprehensiveness are improved, multi-size and multi-type spring tests are adapted, and multi-working-condition mechanical data detection is achieved; through a suspension structure, adaptability and installation convenience of springs of different specifications are enhanced, installation tests of air springs and metal springs are compatible, and the comprehensive practical value of equipment is improved.

The invention discloses a stiffness regulating valve for a multi-cavity air spring, and relates to the technical field of automobile control equipment, the stiffness regulating valve is used for regulating the size of an opening at a communicating air passage of the air spring, the stiffness regulating valve comprises a shell and a motor arranged in the shell, a screw rod and a piston are arranged in the shell, one end of the screw rod is connected with the motor, and the other end of the screw rod is connected with the piston. The other end of the lead screw is fixedly connected with a piston, and the position of the piston corresponds to the communicating air channel. The motor comprises a stator and a rotor, a transmission threaded hole is formed in the rotor along the axis, and the lead screw is meshed with the transmission threaded hole to form transmission connection. Through the unique structural design, the motor directly drives the lead screw to conduct transmission, the transmission precision is improved, the lead screw is arranged in the motor rotor, the axial size space of the valve body is greatly saved, high integration is achieved, the space utilization rate is improved, and the machining cost is reduced.

A footrest assembly for attachment to a chair is provided. The footrest assembly comprises a mounting frame configured to be attached to a seat portion of the chair, the mounting frame comprising a pair of brackets, a recliner frame comprising a first portion configured to be slidably received by the pair of brackets, and a second portion configured to support a footrest, the first portion pivotably connected to the second portion to define a recliner angle therebetween, and an actuator assembly configured to allow adjustment of the recliner angle between the first portion and the second portion, the actuator assembly comprises a gas spring configured to urge the second portion to an extended position, the extended position corresponding to a maximum allowable recliner angle. Further disclosed are a chair comprising a seat portion and a footrest assembly installed to the seat portion, and a method of manufacturing a footrest assembly.

The invention discloses an output energy adjustable gas spring fastener drive tool, comprising a housing; a control circuit board, which is arranged in the housing and used for receiving and outputting signals; a trigger, which is arranged on the housing and used for the operation of the drive tool; a first cylinder block assembly, which comprises a first cylinder barrel for storing compressed gas, a piston arranged in the first cylinder barrel and a drive blade arranged on the piston; a second cylinder barrel, which is used for storing compressed gas; a pressure regulating device, which comprises a one-way channel and an adjustable check valve; the one-way channel is used for the compressed gas in the first cylinder barrel to flow towards the second cylinder barrel; the adjustable check valve is used for the compressed gas in the second cylinder barrel to flow towards the first cylinder barrel.

The invention discloses an air suspension rigidity self-adaptive adjusting system based on double-temperature feedback. The data monitoring and collecting module is used for monitoring and collecting the gas temperature in an air spring airbag cavity, the rubber temperature of the outer surface of an airbag, the gas pressure in the air spring airbag cavity, the gas volume in the air spring airbag cavity, the airbag height and the current vehicle working condition. The coupling rigidity calculation module is used for establishing a rubber rigidity model and calculating the rubber rigidity according to the rubber body temperature of the outer surface of the airbag and the airbag height; the inflation and deflation control module is used for generating target total rigidity according to the current vehicle working condition, calculating target gas pressure in the air spring airbag cavity according to the target total rigidity, the rubber rigidity, the gas temperature in the air spring airbag cavity and the gas volume in the air spring airbag cavity, and sending an inflation and deflation control instruction to inflation and deflation equipment; and the air pressure Pg in the air spring airbag cavity reaches the target air pressure in the air spring airbag cavity.

The invention relates to the technical field of vehicle mass measurement, in particular to a vehicle mass estimation method, device and equipment and a storage medium. The method comprises the steps that the effective bearing area of the air spring, the effective rigidity of the mechanical spring and the unsprung and compensation mass are obtained; collecting the current deviation height of the air spring and the current air pressure intensity in an air spring cavity through a sensor; calculating the first mass of the compressed air spring according to the effective bearing area, the current gas pressure and the gravitational acceleration; calculating a second mass of the compression mechanical spring according to the effective rigidity, the current offset height and the gravitational acceleration; and according to the first mass, the second mass, the unsprung mass and the compensation mass, the estimated whole vehicle mass is obtained. According to the invention, the technical effects of high precision, real-time performance, simple system integration and high environmental adaptability can be achieved when the mass of the whole vehicle is estimated.

The invention belongs to the technical field of engineering machinery, and particularly relates to a damping device, in particular to a nitrogen spring score cylinder and a working method thereof. The nitrogen spring score cylinder comprises a piston rod, a piston rod, a piston rod and a piston rod, the two sealing pieces are arranged in sealing grooves in the outer wall of the piston rod, and the outer walls of the sealing pieces abut against the inner wall of the cylinder body; the oil storage piece is arranged on the outer wall of the piston rod in a sleeving mode and located between the two sealing pieces; the two linkage adjusting pieces are located on the two sides of the oil storage piece respectively and correspond to the sealing pieces respectively; when the piston rod moves leftwards, the linkage adjusting piece located on the right side of the oil storage piece moves rightwards to extrude the sealing piece on the right side to expand outwards and deform. When the piston rod moves rightwards, the linkage adjusting piece located on the left side of the oil storage piece moves leftwards to extrude the sealing piece on the left side to expand outwards and deform; when the linkage adjusting piece moves outwards relative to the oil storage piece, the grease in the oil storage piece moves outwards along with the linkage adjusting piece so that the grease can drip to the outer wall of the piston rod.

A gas spring includes a cylinder, a rod movable relative to the cylinder, and an accumulator. The rod and the cylinder at least partially define a chamber having a variable volume and contain a first pressurized gas. The accumulator is in communication with the chamber and contains a second pressurized gas. The gas spring provides a variable spring rate based on a pressure of the first pressurized gas relative to a threshold pressure.

A gas spring-powered fastener driver includes an outer cylinder, an inner cylinder positioned within the outer cylinder, and a moveable piston positioned within the inner cylinder. The gas spring-powered fastener driver further includes a driver blade attached to the piston and movable therewith between a top-dead-center (TDC) position and a driven or bottom-dead-center (BDC) position. The outer cylinder and the inner cylinder define a first total volume in which gas is located when the driver blade is in the TDC position. The outer cylinder and the inner cylinder define a second total volume, in which gas is located when the driver blade is in the BDC position. A compression ratio of the second total volume to the first total volume is 1.7:1 or less. And, a force acting on the driver blade when located in the TDC position is at least 90 pound-force (lbf) but no more than 450 pound-force (lbf).

A powered fastener driver including: a rotary lifter rotatably supported within the housing and configured to sequentially engage the plurality of teeth to move a driver blade from a bottom-dead-center position toward a top-dead-center position; a drive unit configured to provide torque to the rotary lifter, causing it to rotate; a nosepiece defining a fastener driving channel, the fastener driving channel extending along a driving axis of the driver blade; a workpiece contact element movable relative to the nosepiece between an extended position and a retracted position; a sensor assembly including a first inductive sensor configured to detect a position of the workpiece contact element in one of the extended position or the retracted position; and a second inductive sensor configured to detect an angular position of the rotary lifter, wherein the first inductive sensor and the second inductive sensor are on opposite sides of the rotary lifter.

The utility model discloses a plate turnover machine slide way lifting mechanism for logistics sorting, which comprises a rack, an upper slide way plate arranged on one side of the rack and a lower slide way plate arranged below the upper slide way plate, the upper slide way plate and the lower slide way plate are connected through a plurality of hinges, and the upper slide way plate and the lower slide way plate are respectively provided with a plurality of upper slide way baffles and lower slide way baffles. And a gas spring is arranged to assist the lifting of the lower slide plate. A supporting and limiting assembly is arranged at the bottom of the lower slide plate to ensure stable supporting, and in addition, the lower slide plate is further provided with a handle; according to the utility model, the upper slideway plate is connected with the lower slideway plate through the hinge, and the height of the lower slideway plate can be adjusted according to actual requirements; through cooperation of the gas spring and the supporting and limiting assembly, accidental movement of the lower slide way plate caused by external force or self gravity is avoided, physical labor of operators can be relieved, and safety is improved. And the handle is additionally arranged on the lower slide way plate, so that an operator can more easily adjust the height of the lower slide way plate.

The utility model belongs to the technical field of air spring accessories, and particularly relates to a built-in valve air spring exhaust system pressure retaining valve. The pressure retaining valve comprises an upper valve body arranged in an upper exhaust system of the air spring, an adjusting valve assembly capable of controlling connection and disconnection of the upper valve body and an air pressure cavity of the air spring, a connecting air pipe arranged at the outlet end of the upper valve body and a pressure retaining assembly arranged in the upper valve body and capable of controlling opening and closing of the connecting air pipe. The pressure maintaining assembly comprises a rheostat main valve body, a rheostat piston and an elastic piece; the rheostat main valve body comprises a first valve body connected to the connecting air pipe in a sealed mode and a second valve body connected with the first valve body, wherein an inner cavity of the second valve body is conical. When the air pressure in the air spring is smaller than a set value, the pressure retaining valve closes the exhaust channel so as to ensure that certain air pressure always exists in the air spring, and the technical problem that the service life of parts of the air spring is prolonged due to the fact that the air pressure in the existing air spring is easily emptied is solved.

motor vehicle, - a steering wheel; - a contact unit (6) which is designed to be at least partially rotatable in order to establish an electrical connection between steering wheel-side components and stationary vehicle components, - the steering wheel features: - a gasbag module; - at least one functional element and / or at least one actuating element; - at least one central electronic unit interacting with the functional element and / or the actuating element; - at least one central unit carrier (1) on which the central unit is arranged; and - a connecting device (3) arranged at least partially on the central unit carrier (1), via which the gas bag module can be electrically connected to the vehicle-side contact unit (6), characterized by the fact that the connecting device (3) comprises at least one contact unit coupling element (33) arranged on the central unit carrier (1) and electrically coupling with the contact unit (6) in the form of a plug that can be coupled to a socket of the contact unit (6) or a socket that can be coupled to a plug of the contact unit (6); and the connecting device (3) comprises a carrier in the form of a circuit board (8) arranged in a housing (810), which is different from the central unit carrier (1) and fixed to the gas bag module, wherein a first contact element (81) of the connecting device (3) is arranged on the circuit board (8), which is detachably connected to a second contact element (82) of the connecting device (3) arranged on the central unit carrier (1), wherein at least one module coupling element (310, 311) coupled to the gas bag module is arranged on the circuit board (8).

This utility model relates to the field of variable stiffness air spring technology for automotive suspensions. Specifically, it relates to a stiffness valve for a vehicle suspension air spring system, comprising a valve body; a coil is provided in the valve body; an electromagnetic component is provided in the coil; the electromagnetic component includes a stationary iron; a valve sleeve is connected to the stationary iron; the valve sleeve is connected to the valve body; a valve core is provided in the valve sleeve; the valve core includes an armature, a push rod, and a valve body piston; the armature, push rod, and valve body piston are an integral structure. This utility model, through its integrated valve core design—where the armature, push rod, and valve body piston are an integral structure—effectively reduces the problems of high machining precision and coaxiality of parts after press-fitting in traditional stiffness valves, thereby reducing the number of parts and saving component costs.