400 results about "Friction reduction" patented technology

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 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 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 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 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.

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.

The invention relates to the technical field of silicon steel coil cutting devices, and particularly discloses an automatic silicon steel coil cutting treatment device for transformer machining, which comprises a working plate, a frame is fixedly mounted at the position, close to the middle, of the upper end face of the working plate, a first sliding block is slidably arranged on the inner side of the frame, and a first adjusting rod is arranged on the inner side of the first sliding block; tensioning rotating shafts in a symmetrical state are arranged on the outer sides of the first adjusting rods, the outer circumferential surfaces of the tensioning rotating shafts are covered with nanoscale elastic wear-resistant coatings, pressure sensors are embedded in the tensioning rotating shafts, the pressure sensors are electrically connected with an external controller, and the coiled material tensioning pressure can be fed back in real time and automatically adjusted; the pressure sensor is embedded in the tensioning rotating shaft, the tensioning pressure of the coiled material is fed back in real time, the servo control of the third motor and the fourth motor is combined, the dynamic adjustment of the tensioning pressure is realized, and the coiled material is effectively prevented from being wrinkled and deviated. And meanwhile, the nanoscale elastic wear-resistant coating on the surface of the tensioning rotating shaft can reduce frictional wear, and the surface of the coiled material is prevented from being scratched.

The stamping die is applied to the technical field of stamping dies and comprises an upper die base, a lower die base, a lower die and a lifting plate arranged in a cavity below the lower die, an ejector rod is arranged on the lifting plate, the ejector rod is of a hollow structure and is communicated with a first air bag, and when the ejector rod moves upwards along with the lifting plate to be ejected out, the air bag is communicated with the lower die. The air bag is synchronously extruded to release air in the air bag through the ejector rod, and air flow buffering is formed between the ejector rod and the mold; the lifting plate is connected with the upper die base through a connecting piece, so that the lifting plate is driven to move upwards after the upper die is completely separated from the lower die, and sequential control of ejection actions is realized; a second air bag communicating with the cavity is arranged below the lifting plate, and air flow is formed in the reset process of the lifting plate for heat dissipation and buffering. Through the structural design, under the condition that an independent power source is not added, cooperative improvement of demolding friction reduction, action time sequence control and long-term operation stability is achieved, and the demolding mechanism is suitable for reliable demolding of parts under the continuous stamping working condition.

The invention provides a nitrogen-containing boric acid ester-nano hybrid composite anti-wear additive as well as a preparation method and application thereof, and belongs to the technical field of lubricating oil additives. The nitrogen-containing boric acid ester, the functionalized nanoparticles, the ionic liquid, the auxiliary anti-wear agent and the dispersion stabilizer are subjected to nano-scale hybrid compounding, and the nitrogen-containing boric acid ester, the functionalized nanoparticles, the ionic liquid, the auxiliary anti-wear agent and the dispersion stabilizer have a synergistic effect on four aspects of physical bearing, chemical adsorption, interface modification and extreme pressure enhancement; a multi-synergistic lubrication and protection system of an adsorption film, a physical isolation layer, an extreme pressure reaction layer and rolling lubrication microspheres is constructed, efficient wear resistance, friction reduction, bearing and stability improvement are jointly achieved, and the lubricating oil is suitable for insoluble base oil.

The utility model discloses a metal plate numerical control bending device which comprises a machining table, a portal frame is fixedly installed at the top of the machining table, a bending push rod is fixedly installed at the top of the portal frame, the bottom end of the bending push rod penetrates through and extends into the portal frame, a bending seat is fixedly installed at the output end of the bending push rod, and the bending seat is fixedly installed on the machining table. An electric guide rail is fixedly mounted at the top of the machining table, a movable seat is slidably mounted on the electric guide rail, two bearing seats are mounted at the top of the movable seat, and bending grooves are formed in the tops of the bearing seats. According to the metal plate bending device, placing friction is reduced by arranging the rolling shafts and the auxiliary grooves, bending precision is guaranteed through the limiting assemblies, meanwhile, continuous bending and precise positioning of the infrared sensors are achieved through the electric guide rails and the movable seat moving transversely, metal plates can be taken out and placed conveniently through the auxiliary assemblies, automation, high efficiency and precision are improved through the overall design, and the bending precision is improved. And the production efficiency and the product quality are obviously improved.

The invention discloses an automatic grease supplementing ball valve and a grease supplementing method thereof. The automatic grease supplementing ball valve comprises a valve body, a valve seat, a valve rod, a ball body, a grease injection assembly and a transmission assembly. Each transmission assembly comprises a one-way connecting piece, a gear set and a lead screw, a valve rod is fixed to the ball, a valve shaft is coaxially connected to the lower end of the ball, four sets of grease injection assemblies and transmission assemblies are arranged on the left and right sides of the valve shaft and the ball, threads of the lead screws are reverse to ensure that the push plates move in the same direction, and the valve body is provided with a 90-degree limiting groove. When the valve rod opens the runner, the one-way connecting piece drives the gear set to drive the lead screw, and the four sets of push plates synchronously push sealing grease to four contact points of the ball body and the valve seat; and during closing, the one-way connecting piece idles, and grease injection is stopped. According to the method, sealing is achieved through initial calibration, starting of synchronous grease injection, closing of supply stopping and circulating grease injection. Dynamic and accurate sealing and lubricating friction reduction are achieved, grease waste is avoided, sealing reliability is improved, the service life of parts is prolonged, and the sealing device is suitable for multi-specification ball valves.

A method for producing a Mo-N based coating structure, comprising providing a substrate (1) to be coated and applying a hard material layer (6) onto the substrate (1), the hard material layer (6) comprising at least one layer (4) of Mo-N having a hexagonal crystal structure and at least one layer (5) of Mo-N having a cubic crystal structure or a mixed hexagonal / cubic crystal structure, the hard material layer (6) being applied by a low-temperature closed-field unbalanced reactive magnetron sputtering coating process.

The invention discloses a wide-temperature-range self-adaptive friction-reducing and wear-resistant chromium-containing refractory high-entropy alloy material and a preparation method thereof, and belongs to the technical field of wear-resistant alloy materials, and the high-entropy alloy material comprises the following raw materials in percentage by mass: Ta, Mo, Ti and Cr. The preparation method comprises the steps that Ta powder, Mo powder, Ti powder and Cr powder are weighed by mass, ball milling is conducted, then sintering is conducted through a spark plasma sintering method, and the wide-temperature-range self-adaptive anti-friction and anti-wear chromium-containing refractory high-entropy alloy material is obtained. By introducing the chromium element, the alloy can adaptively form an oxide layer with lubrication and protection effects in a wide temperature range from room temperature to ultrahigh temperature, so that the alloy shows excellent tribological performance and has extremely low friction coefficient and wear rate. The material has a wide application prospect in the fields of wear-resistant lubricating materials and high-temperature wear-resistant parts.

The utility model relates to water pollution treatment technical field, concretely disclose a kind of surface floating object salvage equipment applied to water pollution treatment, including support seat, the bottom of support seat symmetry universal wheel, and the surface of support seat is symmetrically equipped with pneumatic cylinder;The output shaft end of the pneumatic cylinder is connected with slider, and the surface of slider is fixedly connected with collection box, the bottom of collection box is installed with baffle at equal intervals, and the surface of collection box is inlayed and is equipped with filter screen, the surface of slider is equipped with linear motor.This surface floating object salvage equipment applied to water pollution treatment is provided with linear motor, guide rod and support rod, when linear motor drives connecting rod to move, wheel rolls in slide rail, both reduce friction, and also prevent connecting rod from drooping due to length being relatively long by the rigid support of guide rod, so that stable triangular support structure is formed between linear motor, guide rod and support rod, the stability and reliability of salvage operation are improved.

The utility model relates to the technical field of stretching devices, in particular to a multifunctional copper wire stretching device. According to the technical scheme, the device comprises a box body and further comprises a workbench arranged on the box body, a fixing block is arranged on the workbench, a clamping plate is installed in the fixing block, an electric push rod connected with the clamping plate is fixedly installed on the fixing block, and a treatment box is fixedly installed on one side of the top of the workbench. According to the utility model, the burrs attached to the surface of the stretched copper wire are automatically cleaned and removed, the friction loss and stress concentration points are reduced, the normal stretching operation is prevented from being influenced by the breakage of the copper wire, the working efficiency is improved, meanwhile, the operators are protected, and the safety is improved.

The utility model discloses a ball valve seat mounting mechanism which comprises a connecting plate, a fixing plate is arranged on the surface of the connecting plate, an electric push rod is fixed to the surface of the fixing plate, a limiting plate is arranged on the surface of the bottom end of the electric push rod, an auxiliary assembly is arranged on the inner side of the limiting plate, a buffering assembly is arranged at the bottom end of the electric push rod, and a pressing head is connected to the lower portion of the buffering assembly. Connecting assemblies are arranged at the connecting positions of the buffering assembly and the pressing head and the electric push rod, and a valve body clamping base is arranged below the pressing head. When a user uses the electric push rod, the auxiliary assembly is arranged between the limiting plate and the electric push rod through the arrangement of a corresponding structure, the internal ball is attached to the surface of the electric push rod, friction is reduced, the pressing head and the valve body clamping base can be detached at any time, and appropriate parts can be replaced; and meanwhile, the buffering assembly can buffer pressure caused by the pressing head, and the service life of the mounting mechanism is prolonged.

The utility model relates to the technical field of automobile accessories, and discloses a combined camshaft capable of improving fastening performance, which comprises a first shaft body and a second shaft body, threaded protrusions are arranged on the outer walls of the ends, close to each other, of the first shaft body and the second shaft body, and threaded locking sleeves are sleeved on the outer walls of the ends, close to each other, of the first shaft body and the second shaft body. The inner wall of the threaded locking sleeve is in threaded connection to the outer walls of the threaded protrusions on the two sides, a plurality of cams are evenly and fixedly connected to the outer walls of the first shaft body and the second shaft body, a flange plate is fixedly connected to the outer end of the first shaft body, a plurality of threaded holes are formed in the periphery of the middle of the flange plate, and a threaded groove hole is formed in the middle of the first shaft body. By means of the fastening and locking mechanism, it is ensured that the camshaft cannot loosen or fall off in the working process, friction and impact can be reduced through the stable camshaft, the service life of the camshaft and the service life of adjacent components are prolonged, and the situation that the camshaft is loosened and damaged can be reduced through the good fastening and locking mechanism.

The utility model relates to the technical field of instant noodle shaping, in particular to a shaping machine for instant noodle production, which comprises a bottom plate, the surface of the middle of the bottom plate is attached to a plurality of wheels, the upper end of a first shell is fixedly connected with a bent plate, and a plurality of shaping holes are formed in the upper end of the bent plate. According to the shaping machine for instant noodle production, through cooperation of a conveying mechanism and a bent plate, a second rack moves leftwards to a limiting position, a rotating rod continues to rotate to drive a connecting rod to move rightwards so as to drive a gear to move rightwards and drive a first shell to move rightwards, wheels are arranged at the lower end of the first shell, friction resistance is reduced, and the labor-saving effect is achieved; through cooperation of a lifting mechanism and a first shell, an output shaft of a first motor rotates to drive a left tooth-shaped belt wheel rotating convex plate to rotate to drive a transverse plate to move upwards along the outer wall of a first sliding rod, the transverse plate moves downwards to drive a bent rod to move upwards, and the bent rod ejects dried instant noodles out of a shaping hole.

The invention relates to switch contact lubricating grease friendly to copper and silver materials and a preparation method of the switch contact lubricating grease. The lubricating grease comprises the following components in parts by weight: 55-90 parts of base oil, 3-20 parts of a thickening agent and 7-25 parts of a functional additive. The lubricating grease is prepared by reacting organic amine with diphenylmethane diisocyanate (MDI) and adding a specific additive. The lubricating grease has good compatibility with copper and silver materials, does not cause corrosion, and can effectively prevent copper and silver contacts from being oxidized and discolored; the lubricating oil is low in friction coefficient and excellent in friction reduction and wear resistance, and contact wear and operation noise can be remarkably reduced; and meanwhile, the lubricating oil has good shear resistance, adhesion and thermal stability, and can still keep a stable lubricating effect even under severe working conditions such as high temperature and high pressure. In addition, the lubricating grease disclosed by the invention is wide in application range, and is particularly suitable for electrical equipment, automobiles and other application scenes with high-temperature, high-pressure and high-reliability requirements on switch contacts.

In a general aspect, the techniques described herein relate to a medical device that includes a first elongated member that has an extruded outer jacket having an outer sidewall, where the extruded outer jacket includes a polymer material with a slip agent added to the polymer material.

To provide a cylinder block, an engine, and a vehicle capable of easily forming a cylinder bore that is capable of reducing friction.SOLUTION: A cylinder block according to one embodiment of the present disclosure comprises a cooling jacket in which a cylinder part is formed and which has a coolant chamber formed on an outer peripheral part of the cylinder part. The coolant chamber is arranged at a position in a depth direction of the cylinder part that is shallower than a position that is 40% of a depth dimension of the cylinder part.SELECTED DRAWING: Figure 1

This invention provides a pump assembly, a compressor, and an air conditioner. The pump assembly includes a crankshaft, rollers, and a cylinder. The rollers are fitted onto the outer circumferential wall of the crankshaft and are connected by threads. The rollers can reciprocate linearly along the axial direction of the crankshaft under the action of crankshaft rotation. The rollers are located inside the cylinder and divide the internal space of the cylinder into independent first and second cavities. The first and second cavities are arranged along the axial direction of the crankshaft. According to this invention, the counterweight is eliminated, eliminating the need for a counterweight to balance the force. The crankshaft has no eccentric circle, resulting in more balanced force on the compressor, reducing compressor vibration, and avoiding the vibration and component wear problems caused by eccentric rotation in the prior art. At the same time, the sliding vane structure in the prior art is eliminated, reducing moving parts, thereby reducing friction loss and refrigerant leakage, and improving the energy efficiency and reliability of the compressor.

The invention belongs to the technical field of chains, and particularly relates to a precise chain roller with a smooth surface and abrasion resistance and a preparation method thereof. The invention provides a steel roller which is provided with a DLC final working surface on an excircle mirror surface, an excircle has no texture, and only an inner hole is provided with a micron-sized spiral microgroove. The process is implemented according to the sequence of carburizing / quenching / tempering-shot blasting-fine grinding-superfinishing-vacuum PVD, a diamond-like carbon composite coating is formed on an outer circle, and oil storage and capillary pumping are carried out through control of an outer edge fillet, residual compressive stress and DLC adhesive force and an inner hole microgroove, so that work division of antifriction bearing and oil supply functions is realized. A chain provided with the anti-abrasion precision roller with the smooth surface gives consideration to low friction, low noise and stripping resistance under the boundary lubrication and impact-rolling composite working conditions.

The invention discloses a composite structure phasing cycloid type oil-free crossed roller guide rail, and belongs to the technical field of crossed roller guide rails, the composite structure phasing cycloid type oil-free crossed roller guide rail mainly comprises a rotating ring, a sealing ring, a first positioning ring and a second positioning ring, and a V-shaped track groove is formed in the middle of the face, facing the first positioning ring and the second positioning ring, of the rotating ring; a pin mounting cavity is formed in the face, away from the V-shaped track groove, of the rotating ring, and pin tooth structures are distributed in the pin mounting cavity in the circumferential direction. Through the arrangement of the rotating ring, the first positioning ring, the second positioning ring, the rotating ring, the roller, the pin needle mounting cavity, the pin needle, the pin shaft driver and the V-shaped track groove, driving and guiding are coaxially integrated, assembly eccentricity and back clearance are eliminated, zero accumulative error and high repeated precision are achieved through the phasing cycloid structure, self-lubricating metal is matched with engineering plastic, complete oil-free operation is achieved, and the service life of the motor is prolonged. And due to the composite pin tooth structure of the pin shaft and the pin needle, friction, noise and heat productivity are reduced, and durability is improved.

The utility model provides a kind of electromagnetic brake, the electromagnetic brake includes the shell, clutch plate, friction disc and tail plate in turn stacked along preset path, the preset path is parallel to the axial direction of the shell, the shell is equipped with the elastic member and excitation coil acting on the clutch plate;Multiple first slots extending along its radial direction are opened on the clutch plate, the opening of the first slot extends to the outer ring of the clutch plate, and penetrates the clutch plate along the axial direction of the clutch plate, so that the clutch plate is composed of multiple action pieces evenly distributed around its axis;The elastic member includes multiple brake springs, multiple brake springs are one-to-one corresponding with the action piece Setting, and for abutting on the action piece. The electromagnetic brake provided by the utility model is more uniform to the friction effect of friction disc, reduces the local wear of friction disc;Metal powder accumulation in friction area can be reduced, so as to improve the service life of friction disc.

The utility model discloses a door closer electromagnetic release sliding rail rocker arm which comprises an installation plate, a door closer shell fixedly connected to the outer surface of the installation plate, a fixing plate fixedly connected to the inner surface of the door closer shell, a damper fixedly connected to the upper surface of the fixing plate, a spring arranged on the damper, and an equipment plate fixedly connected to the other end of the damper. A rocker arm is rotationally connected to the door closer shell, the other end of the rocker arm is slidably connected with a sliding rail and a supporting plate, an oil can is detachably connected to the supporting plate, an oil pump is fixedly connected to the lower surface of the oil can, the output end of the oil pump is fixedly connected with an oil pipe, and oil can be instilled on the sliding rail through cooperation of the supporting plate, the oil can, the oil pump and the oil pipe; a layer of lubricating film can be formed between the sliding rail and the rocker arm, friction force is remarkably reduced, movement is smoother, the abrasion rate is reduced, the service life of parts is prolonged, and the maintenance and replacement frequency is reduced.

The utility model provides a starlike sleeve with an annular groove, which relates to the technical field of mechanical transmission parts and comprises a starlike sleeve body, a shaft hole is arranged in the middle of the starlike sleeve body, steel ball cavities which are uniformly distributed in a surrounding manner are arranged on the outer end face of the starlike sleeve body, and an inner annular groove is arranged on the wall face of the shaft hole. An oil injection hole is formed in the surface of the starlike sleeve body, an annular oil storage cavity is formed in the starlike sleeve body, and a dustproof plug is inserted into the oil injection hole. The inner ring groove formed in the wall face of the shaft hole and the communicating hole in the wall face of the inner ring groove are communicated with the inner annular oil storage cavity, lubricating oil in the oil storage cavity can evenly flow to the contact portion of the shaft hole and a shaft, the oil guide groove formed in the side wall of the steel ball cavity is communicated with the oil storage cavity, lubrication is provided for rolling of steel balls, rolling resistance is reduced, and the service life of the bearing is prolonged. Therefore, a good lubricating effect can be achieved, friction and abrasion are reduced, and the service life of equipment is prolonged.

The auxiliary wheel comprises hubs and a tire, the hubs comprise an outer hub and an inner hub, the tire is installed on the outer wall of the outer hub, the outer hub and the inner hub are coaxially and detachably connected, a bearing for reducing friction is arranged at the connecting shaft position of the outer hub and the inner hub, and the auxiliary wheel is characterized in that a central shaft hole is formed in the center of the outer hub; a bearing seat with a shaft hole is arranged in the central shaft hole, and a bearing is mounted in the bearing seat; the central part of the inner hub is outwards connected with a connecting shaft, and the connecting shaft penetrates through the bearing seat and the bearing and is fixed together with the bearing; the end cover is detachably fixed to the outer side face of the bearing seat through a first connecting assembly and axially limited, a threaded hole is formed in the center of the connecting shaft, the center of the end cover is connected with a center bolt, and the end cover and the threaded hole of the connecting shaft are connected together through the center bolt. The structure is simple and light, the cost is reduced, and the assembly is convenient.