966 results about "Friction reduction" patented technology

The invention discloses a bending machine capable of meeting different bending requirements and a using method, and relates to the technical field of bending machines, the bending machine comprises bending machine equipment, the bottom end of the interior of the bending machine equipment is fixedly connected with a bending mold, the top end of the interior of the bending machine equipment is provided with a bending knife, and the top end of the interior of the bending machine equipment is fixedly connected with a hydraulic telescopic cylinder; the output end of the hydraulic telescopic cylinder is fixedly connected with the bending knife, the spraying range of the spray head on the outer side of the lubricating pipe is adjusted according to the size of a workpiece, the bending position of the workpiece is lubricated, finally, the hydraulic telescopic cylinder is started, the bending knife is pushed by the hydraulic telescopic cylinder to descend, and therefore the workpiece is bent, and it is guaranteed that in the plate bending process, the bending efficiency is improved. Friction resistance can be reduced through lubrication, so that the bending process is smoother, and the device can be suitable for bending plates of different sizes.

A friction reduction tool configured for selective activation downhole in response to a variation in a media flow's operating condition. A valve assembly and an activation assembly are both positioned downstream of a power assembly, which is configured to rotate a rotating valve segment of the valve assembly with media flow through the tool. The activation assembly is configured to transition from a first position to a second position with the media flow operating condition variation. In the first position, the activation assembly provides a bypass flow path around the valve assembly for at least a portion of the media flow, thereby preventing the valve assembly from generating any significant pressure pulse with rotation of the rotating valve segment. In the second position, the bypass flow path is closed such that all or a majority of the media flows through the valve assembly, thereby generating a significant pressure pulse.

The invention relates to the technical field of intelligent oil injection control, in particular to a limited slip differential gear oil performance directional optimization method and system.The limited slip differential gear oil performance directional optimization method comprises the following steps that the temperature rise rate is collected through a temperature sensor to calculate the gear shaft elongation, and a meshing clearance trend vector is generated by combining differential temperature time sequence analysis; the stability correction is calculated by fusing oil film thickness data, the injection angle compensation driving servo motor is solved based on vector projection, the adhesion factor index is constructed by coupling the oil injection feedback and the oil film difference, the oil product meeting the tension condition is switched when the limit is exceeded, and the lubrication recovery performance is evaluated. According to the method, gear shaft temperature rise and differential mechanism temperature gradient data are collected in real time, meshing clearance accurate prediction is achieved by combining expansion coefficient analysis, stability judgment is improved by fusing oil film thickness data, jet precision is optimized based on a vector projection dynamic compensation jet angle, and an adhesion factor index containing a phase difference is constructed to achieve lubrication attenuation early warning. And oil products are accurately switched by dynamically matching tension and viscosity threshold values, so that friction loss is reduced.

The invention discloses a nuclear power stop valve capable of reducing friction, and relates to the technical field of stop valves. According to the nuclear power stop valve capable of reducing friction, through the design of a composite mechanism, the valve rod is rotated by the hand wheel to drive the valve clack to ascend, a gap is formed between the valve clack and the ring-shaped groove in the surface of the baffle so that liquid can flow conveniently, on the contrary, the valve clack and the ring-shaped groove are in butt joint, the effect of stopping fluid is achieved, and then the fluid flow can be controlled so that the working requirement can be met; the valve clack is in friction fit with the friction mechanism in the lifting process, so that the effect of cleaning components is achieved, impurities on the surfaces of the components are reduced, corrosion caused by too many impurities or the situation that the sealing effect is affected by too many impurities is prevented, protection mechanisms are arranged on the two sides of the valve body shell, and the protection mechanisms are placed on the inner sides of the pipelines on the two sides, so that friction force to the pipelines is enhanced; the sealing effect is improved, aging leakage of the two sides of equipment is prevented, friction of liquid to parts is reduced, equipment abrasion is reduced, and therefore the service life of the equipment is prolonged.

Disclosed herein are solid-liquid bi-phase lubricating devices that can include a cuboidal shaped stick with at-least one cylindrical or cuboidal shaped hollow core running through entire or partial length of the stick. The cuboidal shaped stick can include a solid polymer-based composite while the inner space is filled with a semi-fluid grease lubricant. The solid polymer-based composite can include one or more polymers, filler materials, corrosion inhibitors, plasticizers, and additives. The grease lubricant can include lithium, lithium-complex, aluminum-complex, calcium-sulphonate complex, bentone-thickened grease, and mixtures thereof and have an NLGI consistency grade≥1. The lubricating devices can be used for friction reduction of mechanical components involving two or more contacting surfaces in relative motion, such as a steel wheel flange-rail contact interface of transit and freight rail transport systems.

The invention relates to the technical field of speed reducers, in particular to a multi-stage coaxial speed reducer which comprises an outer cylinder, a first-stage gear ring and a second / third-stage gear ring are arranged in the outer cylinder, and a first-stage speed reducer, a second-stage speed reducer and a third-stage speed reducer are sequentially arranged in the outer cylinder. The first-stage planet carrier framework is axially fixed, and the second-stage planet carrier framework and the third-stage planet carrier framework axially float; gaskets / thrust bearings are arranged between stages to achieve axial supporting and friction reduction, and the last-stage three-stage planet gears adopt staggered-tooth gears to eliminate meshing clearances. Through the coaxial compact integrated design, the large reduction ratio and the compact structure are both considered; due to the lubricating circulation design of inter-stage antifriction supporting and self-adaptive rotating speed, the friction loss is greatly reduced, and the transmission efficiency is improved; the structure of staggered tooth clearance eliminating, elastic buffering and shaft system stabilizing effectively reduces gear abrasion and impact loads, remarkably prolongs the service life, has the advantages of being high in transmission precision, fast in response and stable in operation, and can be used for precise transmission, automobile active stabilizer bars and other scenes.

The invention provides a gearbox oil composition with a temperature rise inhibiting effect. The gearbox oil composition comprises the following components in parts by weight: 1-5 parts of an anti-scratch agent; 1.0 to 3.5 parts of an anti-wear reagent at extreme pressure; 0.2 to 2.5 parts of an antifriction additive; 0.04 to 0.15 part of a metal deactivator; 0.02 to 0.1 part of an antirust agent; 0.1 to 0.3 part of an ashless dispersant; 0 to 0.05 part of an anti-foaming agent; 2-8 parts of a viscosity index improver; the lubricating oil composition is prepared from the following components in parts by weight: 5 to 15 parts of ester oil, 2 to 10 parts of HVIS150BS, and 88.64 to 55.35 parts of PAO6 and PAO40. The gear box oil composition with the temperature rise inhibiting effect has the beneficial effects that the gear box oil composition with the temperature rise inhibiting effect simultaneously has scratch resistance, abrasion resistance, bearing capacity, friction reduction and corrosion resistance, can inhibit the temperature rise of oil products, and is suitable for lubricating gear boxes of equipment such as high-speed rails and the like with relatively high temperature rise inhibiting requirements.

A floating joint and retainer connection device includes a fixed retainer internally defines a receiving space; an adaptor joint having an end extending through the receiving space to an outer side of the fixed retainer and an axially limiting section formed near another end; a fixing element fitted on the adaptor joint and located outside the fixed retainer for limiting the adaptor joint from moving axially while allowing the adaptor joint to displace radially relative to the fixed retainer; a rolling assembly disposed adjoining the fixed retainer; and a spring located in the receiving space and fitted on the adaptor joint with two ends pressed against the axially limiting section and the fixed retainer or the rolling assembly. When the rolling assembly rolls to displace radially relative to the fixed retainer, a radial frictional force produced by a normal force applied by the spring to the fixed retainer is reduced.

The invention belongs to the technical field of robot and intelligent equipment driving, and discloses an integrated servo push rod and a control method.A push rod module is integrally designed, and a high-density motor, a ball push rod and a band-type brake are arranged in the push rod module. The invention has the characteristics of high power density, small volume, high precision, high response speed, low noise, long service life, high reliability and the like. The inside of the push rod is contacted with the deep groove ball bearing at the tail end of the screw rod through the ball retainer, and the outside is contacted with the oil-free bushing, so that the lateral strength of the push rod is improved, friction is reduced, and operation efficiency is improved. A linear encoder is arranged at the end of the screw rod, accurate control of the tail end can be achieved, a magnetic encoder is arranged at the tail end of the motor, input and output end double-closed-loop can be achieved, precision can be improved, and errors of band-type brake in power-off response time can be compensated; the lead screw is connected with the motor through the diaphragm coupling in the motor, so that the axial space is saved, and the service life of the motor is prolonged.

The frequency converter shell stamping device particularly relates to the technical field of frequency converter production and comprises a machine shell, a plurality of machine legs are fixedly connected to the lower end of the machine shell, a containing plate is fixedly connected to the inner surface of the machine shell, an upper die is fixedly installed at the lower end of a hydraulic cylinder, and a conveying and oil spraying assembly is arranged on the inner surface of the machine shell. A cooling supporting assembly is arranged on the inner surface of the lower mold and the inner surface of the upper mold. According to the frequency converter shell stamping device, by arranging the oil spraying mechanism, lubricating oil is sprayed to the upper die and the lower die, meanwhile, an aluminum alloy plate in the moving process can be sprayed, friction can be effectively reduced, abrasion between the dies and materials in the stamping process is reduced, the service life of the dies is prolonged, and meanwhile, the production efficiency is improved. And the lubricating oil can improve the stability in the stamping process, reduce the risks of material deformation, wrinkles and cracks, and ensure the surface quality and dimensional precision of the aluminum alloy plate.

A friction reduction tool configured for selective activation downhole in response to a variation in a media flow's operating condition. A valve assembly and an activation assembly are both positioned downstream of a power assembly, which is configured to rotate a rotating valve segment of the valve assembly with media flow through the tool. The activation assembly is configured to transition from a first position to a second position with the media flow operating condition variation. In the first position, the activation assembly provides a bypass flow path around the valve assembly for at least a portion of the media flow, thereby preventing the valve assembly from generating any significant pressure pulse with rotation of the rotating valve segment. In the second position, the bypass flow path is closed such that all or a majority of the media flows through the valve assembly, thereby generating a significant pressure pulse.

The invention discloses a V-shaped thrust retainer which comprises an annular main body, and the annular main body is provided with pockets for mounting a rotating body; the pocket is provided with a V-shaped limiting part for limiting the rotation body to move in the axial direction of the pocket; the annular body is further provided with an outer oil storage part for containing lubricating oil, a buffering part and a buffering ring, the buffering part is arranged between every two adjacent pockets, an oil storage cavity is formed in each buffering part, and the buffering ring is arranged on the side wall of the inner ring of the annular body. Compared with a traditional arc-shaped / annular flange and other structures, the V-shaped limiting part can reduce the contact area of the rotating part and the limiting structure, friction loss is reduced, and lubricating oil consumption is reduced; by arranging the buffering part, the buffering layer can play a role in absorbing and damping, so that the rolling path of the rotating body can be kept stable, collision impact and vibration generated in the rolling process are further reduced through the stability of the rotating body, and finally the damping and noise reduction effects of the retainer and the bearing are achieved.

The invention relates to the technical field of part stamping dies, in particular to an automobile part machining stamping forming die which comprises a mounting plate, a fixed supporting structure is arranged below the mounting plate, a first mounting block is fixedly mounted on the upper side of the mounting plate, and a detachable lower die base is arranged on the upper side of the first mounting block. In the process that a sliding block moves downwards along with a movable adaptive block, the top face of the sliding block retracts into a first sliding cavity, space is reserved for stamping, when stamping is completed and an upper die block ascends, a second spring pushes the movable adaptive block to move upwards, the top of the sliding block protrudes out of the surface of a lower die base to eject a workpiece, and the top of the sliding block makes contact with an extrusion sensor to trigger an automatic oil injection pump; lubricating oil is injected into the oil injection hole through the guide pipe and sprayed to the surface of the lower die base through the oil injection groove to complete lubrication of the lower surface, the bidirectional lubrication mechanism ensures that the metal sheet is comprehensively lubricated in the stamping process, friction loss is remarkably reduced, and the product surface quality is improved.

The present invention discloses an inner ring smoothness processing device for gear processing, which specifically relates to the technical field of gear processing, and comprises a base, a control box is fixedly installed at the front end of the base, a shell is fixedly connected to the upper end of the base, a frame is fixedly connected to the upper end of the shell, a clamping and rotating assembly is arranged on the inner surface of the base, and a cleaning and polishing assembly is arranged on the upper inner surface and the upper end of the shell. The inner ring smoothness processing device for gear processing described in the present invention is provided with a revolution mechanism, a clamping mechanism and a rotation mechanism, so that the gear can realize automatic clamping operation during the rotation process, and when the gear revolves to a set angle, the gear can realize self-rotation and rotate together with the polishing component, which is helpful to realize uniform polishing of the inner ring, improve surface smoothness, reduce friction and wear, thereby improving the transmission efficiency of the gear, extending the service life, reducing noise and vibration, and improving the surface quality of the inner ring.

The invention provides a guide wheel structure of a buoy gate, and relates to the technical field of guide wheels, the guide wheel structure comprises a gate main body, a guide device is arranged on the gate main body, the guide device comprises a guide rail and a guide wheel, one end of the guide rail is a fixed part, the other end of the guide rail is a sliding groove, the section of the sliding groove is U-shaped, and the guide wheel is arranged in the sliding groove. The guide wheel comprises a connecting end and a limiting end, the connecting end of the guide wheel is connected with the gate body, the limiting end of the guide wheel is located in the sliding groove, the limiting end of the guide wheel is hemispherical, the limiting end and the sliding groove cannot be completely attached, and a gap between the limiting end and the sliding groove is a moving space. Friction force and resistance of water flow can be reduced when the gate body moves up and down through the movable space, a rotating sleeve piece is further arranged at the limiting end, and compared with the prior art, the gate has the beneficial effects that lubricating liquid can better flow in the sliding groove through the movable space, and therefore the lubricating effect is better.

The invention relates to the technical field of lubricating oil, in particular to high-temperature-corrosion-resistant lubricating oil and a preparation method thereof. The high-temperature-corrosion-resistant lubricating oil is prepared from the following raw materials in parts by mass: 130 to 190 parts of base oil, 1 to 5 parts of an anti-wear reagent at extreme pressure, 1 to 5 parts of amino modified graphene, 0.1 to 1 part of an anti-rust agent, 1 to 3 parts of an antioxidant, 0.1 to 1 part of a de-foaming agent, 5 to 15 parts of trioctyl trimellitate, 1 to 5 parts of sodium lignin sulfonate and 1 to 5 parts of sodium bentonite. The high temperature resistance and the viscosity-temperature performance of the lubricating oil can meet the use requirements of a bearing under the working conditions of high speed, high temperature and large load, the wear resistance and the friction reduction of the lubricating oil at high temperature are effectively improved, and meanwhile the preparation method is simple and suitable for large-scale popularization and application.

The invention belongs to the technical field of petroleum drilling tools, discloses an intelligent-control friction-reducing, resistance-reducing and speed-increasing tool for a screw drill, and achieves the purpose of friction-reducing, resistance-reducing and speed-increasing. The lower portion of the tool is connected with a screw drill through a measurement-while-drilling pup joint, the upper portion of the tool is connected with an upper drill column, and the tool comprises a movable shaft connected with the screw drill; the mechanical transmission system comprises an inner shaft connected with the transmission shaft, the inner shaft rotates along with the transmission shaft to transmit torque, the friction sleeve is dynamically connected with the inner shaft through a gear clutch mechanism, and the driving assembly is used for driving the friction sleeve to move axially so as to adjust the friction force between the friction sleeve and the inner shaft; the tool face angle measuring system is used for measuring the tool face angle of the screw drill in real time and transmitting a measuring signal to the intelligent automatic control system; and the intelligent automatic control system is used for automatically regulating and controlling the friction force between the friction sleeve and the inner shaft according to the received measurement signal so as to balance the reaction torque generated by the drill bit of the screw drill and keep the tool surface stable.

The invention relates to the technical field of propeller cleaning, in particular to an MR oil tanker propeller ultrasonic cleaning system which comprises a cleaning mechanism, a purifying mechanism is arranged on one side of the cleaning mechanism, a medicine feeding mechanism is arranged above the cleaning mechanism, and the medicine feeding mechanism is connected with the purifying mechanism. The cleaning mechanism comprises a cleaning pool, a first ultrasonic transducer used for emitting ultrasonic vibration from the bottom, a second ultrasonic transducer used for emitting ultrasonic vibration from the two sides, a waterproof hydraulic cylinder used for shaking a propeller, a connecting block, a moving seat and wheels. According to the scheme, the cleaning efficiency of dirt on the surface of the propeller is remarkably improved, the ultrasonic transducers distributed at the bottom and on the two sides can generate a high-frequency cavitation effect to cover all parts of the propeller, and the movable base driven by the waterproof hydraulic cylinder drives the propeller to reciprocate in the cleaning pool to be matched with wheels to reduce friction; dirt is stripped in an accelerated mode under the dual effects of mechanical shaking and the cavitation effect.

The invention discloses a medium-entropy (Zr, Ta, W) C coating and a preparation method and application thereof. The medium-entropy (Zr, Ta, W) C gradient coating is prepared on the surface of the titanium alloy or the iron-based alloy through the double-layer glow plasma surface metallurgy technology, and gradient temperature annealing treatment is conducted. The preparation method has the specific advantages that (1) the prepared coating is of a continuous gradient structure, good interface metallurgical bonding is formed between the coating and a matrix, the bonding force of the coating is not lower than 50 N, and the coating is not prone to cracking and stripping in the service process due to the high bonding strength; and (2) the hardness of the medium-entropy (Zr, Ta, W) C coating prepared by the method is 25-30 GPa, the fracture toughness is 4.0-5.0 MPa * m < 1 / 2 >, and the coating system has balanced hardness and toughness, so that the coating is endowed with excellent wear resistance. The prepared coating has excellent wear resistance and antifriction performance, and has wide application prospects in the field of wear-resistant protective coatings.

The utility model discloses a plastic oil self-lubricating maintenance-free axle bearing which comprises an outer ring, a rolling body, an inner ring and plastic oil, the rolling body is arranged between the inner ring and the outer ring, the plastic oil is in contact with the rolling body and is used for lubricating the rolling body, the utility model provides the novel self-lubricating maintenance-free axle bearing, and the plastic oil formed by an oil-saturated polymer matrix is used as a lubricating medium of the axle bearing; the lubricating oil can stably run in high-load, high-dust, high-temperature and low-temperature environments, and a lubricating film is autonomously formed in the running process, so that the maintenance frequency is reduced, the friction loss is reduced, the wear resistance is enhanced, and even the lubricating oil is maintenance-free. And the solid plastic oil is not easy to leak, so that the risk of environmental pollution is reduced.

The invention relates to a preparation method of an AlCoCrFeNi-based self-lubricating composite high-entropy alloy coating, which comprises the following steps: uniformly mixing AlCoCrFeNi high-entropy alloy powder and Ni / C in a ball milling or mechanical manner to obtain composite powder; and the composite powder is fully melted by using a high velocity oxy-fuel spraying technology and then sprayed to the surface of a pretreated base material, so that the AlCoCrFeNi + Ni / C coating is obtained. The preparation method is simple and easy to implement, and the obtained AlCoCrFeNi + Ni / C coating has good antifriction and wear-resisting performance, has potential application prospects in the environment where a mechanical motion system needs antifriction and wear-resisting, and can be suitable for surfaces of various matrixes and different metal parts.

The invention relates to the technical field of bearing pedestals, in particular to wind generating set bearing pedestal supporting equipment which comprises a shell, a main shaft is connected to the inner side of the shell in a sleeved mode, and the wind generating set bearing pedestal supporting equipment is characterized in that a material storage box is arranged on the upper surface of the shell, a material injection opening is connected to the top of the material storage box in a penetrating mode, and an oil conveying pump is connected to the bottom of the material storage box in a penetrating mode; the bottom of the oil delivery pump is connected with an oil delivery pipeline in a penetrating mode, the lower surface of the shell is connected with an oil well pump in a penetrating mode, the bottom of the oil well pump is connected with a storage cavity in a penetrating mode, the bottom of the storage cavity is symmetrically connected with ball valves in a penetrating mode, and the upper surface of the bottom of the shell is fixedly connected with a storage cavity. Old grease can be discharged through pressure, the residual old grease in the shell is completely removed, the situation that the lubricating performance is reduced due to the fact that the new grease and the old grease are mixed is avoided, the new grease can more evenly cover the surface of the bearing, an effective lubricating film is formed, and friction and abrasion are reduced.

The invention discloses an RV speed reducer and an industrial robot, and relates to the technical field of speed reducers. The RV speed reducer comprises a pin wheel housing, a planet carrier and a main bearing; the main bearing is used for supporting relative movement of the planet carrier and the pin wheel housing, the main bearing comprises an inner ring, an outer ring and a rolling body clamped between the inner ring and the outer ring, the inner ring is formed on the planet carrier, the outer ring is fixedly connected with the pin wheel housing, the outer ring is provided with a track, and the track comprises an arc-shaped section; wherein the outer diameter phi 3 of the outer ring, the bottom diameter phi 2 of the track, the radius R of the arc-shaped section and the diameter S of the rolling body meet the following conditions: (S * 1.015) / 2 < = R < = (S * 1.025) / 2, and (phi 2 + 4.6 mm) < = phi 3 < = (phi 2 + 6 mm). By reasonably limiting the sizes of the track and the outer ring, the deformation of the track is controlled, the friction loss is reduced and the service life of the main bearing is prolonged while the main bearing is simple to assemble and low in production cost.

The present invention provides a downhole oil production straightener for oil fields, and relates to the technical field of oil field oil production equipment. The downhole oil production straightener for oil fields includes a mounting and fixing structure fixed to the outer wall of a drill pipe, the mounting and fixing structure includes a first mounting seat and a second mounting seat, the first mounting seat and the second mounting seat are both provided with a plurality of mounting holes on their circumferential sides; the first mounting seat and the second mounting seat are both sleeved and fixed to the outer wall of the drill pipe; a support mechanism is fixedly connected to the mounting and fixing structure; and a plurality of groups of elastic buffer mechanisms are installed on the circumferential side of the support mechanism. By designing a simple rotating support mechanism and an elastic buffer mechanism, when the support seat is blocked by gravel during movement, the support seat can be buffered by a spring, and when the buffer is squeezed to the limit position, a plurality of support seats will slide sideways on the surface of the gravel as a whole, thereby realizing the overall rotation of the plurality of support seats, so as to better pass through the blocked area, and at the same time reduce friction and wear.

The utility model relates to the technical field of filtering equipment, in particular to a vacuum sliding table structure of a filtering machine, which comprises a sliding table body, a vacuum chamber is arranged in the middle of the sliding table body, a filtering cavity and a discharge hole are arranged below the vacuum chamber, and a mounting area is arranged on the sliding table body. The installation areas are arranged on the left side and the right side of the vacuum chamber respectively, floating plates are arranged in the installation areas and connected to the sliding table body through elastic assemblies, sliding grooves are formed in the upper ends of the floating plates, and friction belts are arranged in the sliding grooves. The sliding table has the advantages that the floating plate is connected to the sliding table body through the elastic assembly, the sliding efficiency and smoothness of a sliding part are improved, friction resistance is reduced, the situation that a rubber belt and a friction belt are abraded and cannot be tightly attached, and the vacuum environment is damaged is avoided, the influence of external force on the sliding table can be buffered and dispersed to a certain degree, and the service life of the sliding table is prolonged. And the service life of equipment is prolonged.

According to the novel bridge support sliding plate provided by the utility model, the plastic oil is used as a lubricating medium; the friction coefficient is reduced, the wear resistance is improved, and vibration and noise are reduced; a lubricating film is automatically formed in the operation process, the lubricating film ensures continuous lubrication in a severe environment and adapts to the stability performance of a wide temperature range, the structural stress of the bridge support under stress is effectively reduced, vibration and noise between moving parts are reduced, the stability and durability of operation of the bridge support sliding plate are remarkably improved, and the service life of the bridge support sliding plate is prolonged. Bridge faults caused by poor lubrication are reduced; a good lubrication state is kept for a long time, friction loss is reduced, and the maintenance-free effect is achieved. And the solid plastic oil is not easy to leak, so that the risk of environmental pollution is reduced.

The invention discloses a rotor coaxial heat dissipation structure, a fluorine-containing metal-based lubricating composition and application of cooperation of the rotor coaxial heat dissipation structure and the fluorine-containing metal-based lubricating composition in a motor rotor shaft, and the rotor coaxial heat dissipation structure and gradient functional coatings sequentially formed on the surface of the motor rotor shaft comprise a bottom layer used for leading out winding heat; the transition layer is used for solid lubrication and PFPE heat triggering slow release; the surface layer is used for reducing friction and repairing microcracks; a micro-pit array and a spiral flow guide groove which are machined through laser are formed in the outer portion of the surface layer. According to the invention, a gradient functional coating three-layer synergistic structure is adopted to construct a gradient framework of a bottom layer (a heat conduction band nano reinforced phase), a transition layer (oriented whiskers and slow-release lubrication) and a surface layer (magnetic response self-repairing), so that the problem that heat management, wear resistance and self-repairing functions of a traditional coating are difficult to be compatible is solved; and meanwhile, through the combined design of the laser micro-pit array (liquid storage and resistance reduction) and the spiral flow guide groove (strengthening the flowing of the cooling medium), the heat dissipation efficiency is cooperatively improved.

A friction reduction tool configured for selective activation downhole in response to a variation in a media flow's operating condition. A valve assembly and an activation assembly are both positioned downstream of a power assembly, which is configured to rotate a rotating valve segment of the valve assembly with media flow through the tool. The activation assembly is configured to transition from a first position to a second position with the media flow operating condition variation. In the first position, the activation assembly provides a bypass flow path around the valve assembly for at least a portion of the media flow, thereby preventing the valve assembly from generating any significant pressure pulse with rotation of the rotating valve segment. In the second position, the bypass flow path is closed such that all or a majority of the media flows through the valve assembly, thereby generating a significant pressure pulse.

The invention relates to the technical field of damping and buffering, and discloses a hydraulic cylinder with damping and buffering functions, which comprises a cylinder barrel, a first end cover is fixedly clamped to the left side of the cylinder barrel, a buffering mechanism is slidably connected to the left side of the first end cover, and a second end cover is fixedly clamped to the right side of the cylinder barrel. A piston centering mechanism is fixedly connected to the right side of the second end cover, a hydraulic force increasing mechanism is fixedly connected to the outer surface of the first end cover, a first piston is slidably connected to the inner surface of the cylinder barrel, a first sealing ring is clamped to the outer surface of the first piston, and a piston rod is fixedly connected to the right side of the first piston. The position of the piston can be automatically adjusted, the piston can be well matched with the cylinder barrel, friction and vibration are reduced, hydraulic oil can flow between the piston and the cylinder barrel more smoothly, the working efficiency and stability of the hydraulic cylinder are improved, and the piston centering mechanism can absorb and buffer influences caused by external impact and load changes and protect the hydraulic cylinder.

The invention discloses a high-precision clamping force estimation method of an electronic mechanical braking system, and belongs to the technical field of automobile braking system control. The method comprises the following steps: acquiring real-time signals such as motor rotation angle, angular velocity and current, and acquiring a steady-state clamping force estimation value by using a seven-degree polynomial static model; then based on a motor angular speed judgment working condition, correcting a tightening force estimation value through an inertia and friction dynamic compensation model under a high-speed dynamic working condition to obtain a model output force; estimating unmodeled disturbances such as friction change and temperature excursion in real time through an extended state observer to obtain disturbance compensation force; and finally, obtaining a final clamping force estimated value by adopting working condition self-adaptive weighted fusion. According to the method, errors caused by factors such as friction change, temperature excursion and structure aging can be effectively reduced, and high-precision estimation of the clamping force is achieved.