1536 results about "Slider bearing" patented technology

The invention relates to the field of mechanical equipment health management, in particular to a large sliding bearing fault detection and evaluation method, device and system. Comprising the following steps: collecting multi-source sensing data, and constructing a comprehensive data set; constructing a state space model based on a sliding bearing physical mechanism; the multi-source sensing data and the state space model are fused through Bayesian filtering, and hidden state parameter posterior distribution is dynamically estimated; generating a virtual fault sample by using a generative adversarial network in combination with a physical rule base; designing a Bayesian space-time sequence diagnosis model based on an attention mechanism, and generating fusion health state features; processing and fusing the health state features by using a degradation process model, and predicting the remaining service life of the bearing; and based on the health state, the fault probability and the remaining service life, setting multi-stage early warning threshold values, and triggering intelligent early warning. According to the method, the defect that a single model is insufficient in adaptability and generalization ability under complex working conditions is overcome, and the accuracy and reliability of fault detection are remarkably improved.

The invention discloses a sliding bearing friction wear prediction method based on fluid mechanics, and relates to the technical field of mechanical state monitoring, and the method comprises the steps: collecting single-point temperature, local pressure, vibration time domain signals and a bearing pedestal inclination angle through a sensor, and generating sensor data; performing field reconstruction based on a fluid mechanics conservation equation on the sensor data to obtain multi-field data; performing spatial alignment on the multi-field data, inputting the multi-field data into a long short-term memory (LSTM) network, and generating wear state characteristics; training a sparse correlation vector machine regression model RVM by using the historical wear data, establishing a nonlinear mapping relationship between the wear state characteristics and the wear depth, taking the wear state characteristics as the input of the vector machine regression model RVM, and outputting the predicted wear depth; sensor data and the predicted wear depth are fused in real time through Kalman filtering, and when prediction deviation exceeds a covariance threshold value, vector machine regression model RVM parameters are updated.

The invention discloses a sliding bearing-rotor system stability test system and method under an impact load, and relates to the field of rotating machinery test in mechanical engineering. According to the technical scheme, different types of impact loads are applied through a vibration acceleration platform, and starting, stopping or external impact force in actual working conditions is simulated. In the testing process, a high-precision sensor and a multi-channel acquisition board card are used for monitoring the vibration characteristic and the rotating speed of the system in real time, it is guaranteed that signals of different positions and types can be synchronously acquired, and comprehensive system state information is provided. Then, in combination with time domain and frequency domain analysis technologies, key features are extracted from mass data by applying an advanced Fourier transform algorithm, the resonant frequency, modal characteristics and potential fault modes of the system are identified, and accurate evaluation of the stability of the system is realized. Experimental results show that the real-time monitoring and analysis method can effectively improve the stability test precision of the sliding bearing-rotor system under the impact load, and provides powerful technical support for engineering application. The method is used for evaluating the stability of the sliding bearing-rotor system under the impact load.

The invention discloses a method and system for measuring the ultrasonic proportionality coefficient of the thickness of a lubricating film of a sliding bearing, and the method comprises the steps: firstly, obtaining the comprehensive response coefficient of sound waves in a transition combination layer of a substrate and a lining through calculating the proportionality coefficient of a reflection echo signal of a bearing bush in an air medium and a reflection echo signal of a substrate-lining interface; characterizing the propagation rule of sound waves in a base body and lining combination layer; secondly, a proportionality coefficient is constructed based on a lubricating film reflection echo signal and a matrix-lining interface reflection echo signal, a lubricating film reflection coefficient is calculated in combination with a comprehensive response coefficient of sound waves in a matrix-lining transition combination layer, and finally the thickness of the lubricating film is solved through a resonance model method or a composite model method. According to the invention, the influence of the change of the binding force between the sensor and the substrate and the unstable voltage of ultrasonic pulse emission equipment on the reference signal can be avoided, the robustness is high, and the long-term reliable monitoring of the thickness of the lubricating film of the sliding bearing is facilitated.

The invention provides a horizontal sliding bearing test bed, which belongs to the field of sliding bearing safety operation and detection and comprises a main transmission system, a driving system, a radial loading system, a heating system and a hydraulic system. A sliding bearing seat in the radial loading system is inversely fixed on a lower loading plate and is detachably sleeved and fixed on a test bearing, and a test bed applies pressure to the lower loading plate through a hydraulic cylinder to apply radial load to a test sliding bearing. A rotary swing hydraulic oil cylinder in the main transmission system provides power to test the horizontal sliding bearing. The hydraulic system is connected with the rotary swing hydraulic oil cylinder and the radial loading oil cylinder and can achieve closed-loop control over torque and radial loading force. The heating system simulates a high-temperature working condition through a heating box, and a test bearing can be set to be tested at a specific high temperature. According to the invention, large load detection can be realized, working condition simulation is accurate, data such as bearing working torque and service life can be detected, and comprehensive and multi-size adaptability is realized.

The utility model discloses a bearing bush oil sealing structure of a sliding bearing, which comprises a shaft, a bearing bush box, a bearing bush and an air blowing chamber, the shaft penetrates through the bearing bush box, the bearing bush is arranged in the bearing bush box, a second sealing packing is arranged on the right side of the bearing bush box, and a second sealing ring is arranged on the inner side of the second sealing packing. A third sealing packing is arranged on the right side of the second sealing packing, an air sealing cavity is formed between the second sealing packing and the third sealing packing, an air guide wing is arranged in the air sealing cavity and is in a conical trumpet shape, and a trumpet-shaped large opening of the air guide wing is in threaded connection with the side face, close to the bearing bush, of the interior of the third sealing packing; a trumpet-shaped small opening of the air guide wing is obliquely opposite to the direction of the second sealing ring; the structure is simple in design and low in improvement cost, positive pressure gas is introduced into the gap between the inner ring of the sealing ring and the shaft through the blowing chamber, and the oil gas pressure in the bearing bush chamber is kept in a slightly positive pressure state, so that the oil gas can be prevented from overflowing into a motor body from the fit gap between the second sealing ring and the motor shaft.

The invention discloses a sliding bearing-rotor system stability test system and method under a complex alternating load, and relates to the field of rotating machinery test in mechanical engineering. According to the technical key points, a multi-direction and multi-frequency dynamic load is applied through a six-degree-of-freedom platform, and a complex vibration and stress environment in an actual working condition is simulated. In the testing process, a high-precision sensor and a multi-channel acquisition board card are used for monitoring the vibration characteristic and the rotating speed of the system in real time, it is guaranteed that signals of different positions and types can be synchronously acquired, and comprehensive system state information is provided. Then, in combination with time domain and frequency domain analysis technologies, key features are extracted from mass data by applying an advanced Fourier transform algorithm, the resonant frequency, modal characteristics and potential fault modes of the system are identified, and accurate evaluation of the stability of the system is realized. Experimental results show that the real-time monitoring and analyzing method can effectively improve the stability testing precision of the sliding bearing-rotor system under the complex alternating load, and powerful technical support is provided for engineering application. The method is used for evaluating the stability of the sliding bearing-rotor system under the complex alternating load.

A wing for an aircraft, including a main wing and a slat assembly including a slat and at least one connection assembly movably connecting the slat to the main wing, such that the slat is movable between a retracted position and at least one extended position, such that the connection assembly has an elongate slat track, and the front end of the slat track is mounted to the slat, such that the rear end and / or the intermediate portion of the slat track are mounted to the main wing by a roller or slide bearing such that the slat track is movable along the track longitudinal axis, such that the connection assembly has a drive unit configured for driving the slat track, such that the drive unit includes a rotary actuator having at least one drive arm rotatably driven about a rotation axis and drivingly engaging the slat track.

The invention discloses a variable-damping tilting pad bearing, and relates to the technical field of sliding bearings. Comprising an upper half bearing shell, a lower half bearing shell, spherical supports, oil injection devices, tilting pads and bearing end covers, the upper half bearing shell and the lower half bearing shell form an annular bearing shell, the tilting pads are arranged on the inner side of the annular bearing shell and distributed at equal intervals in the circumferential direction, and the spherical supports are installed between the pad backs of the tilting pads and the annular bearing shell. The oil spraying devices are arranged between the adjacent tilting pads, the bearing end covers are installed on the two axial sides of the annular bearing shell, and through drainage holes are formed in the spherical supports and the tilting pads. Lubricating oil sprayed into the tile surfaces of the tilting tiles from an oil spraying device forms a high-pressure power oil film on the tile surfaces, part of the high-pressure lubricating oil enters the space between the spherical support and the annular bearing shell through the through drainage holes, high-pressure radial jacking force is formed, the spherical support is jacked up, and a static-pressure oil film is formed between the spherical support and the annular bearing shell. And the supporting damping of the tilting pad is improved.

The invention relates to a turbine tilting pad sliding bearing lubricating oil device and an oil temperature adjusting method. The lubricating oil device comprises an oil inlet pipe and an oil supply pipe. A mounting part is arranged at the oil outlet end of the oil inlet pipe and is provided with a rotating hole; the oil supply pipe is rotationally arranged on the rotating hole, and an oil spraying hole is formed in the outer side wall of the oil supply pipe; a rotating shifting block is arranged on the outer side wall of the oil supply pipe, a mounting groove is formed in the inner side wall of the rotating hole, an arc-shaped groove coaxial with the rotating hole is formed in the mounting groove, and the sliding end of the rotating shifting block is slidably arranged on the arc-shaped groove and divides the mounting groove into a supporting groove and a driving groove in the circumferential direction of the rotating hole; one end of the elastic piece is connected to the groove wall, away from the rotating shifting block, of the driving groove, and the other end of the elastic piece abuts against the rotating shifting block. The driving groove is filled with a driving body, and the driving body abuts against the rotating shifting block. The system can automatically adjust the temperature of the lubricating oil, has the characteristics of rapidness and high reliability, and can meet the requirement of rapid load change of a coal power unit under a novel power system.

The invention relates to a repeatedly detachable magnetic composite water lubricated bearing and a maintenance method thereof.The water lubricated bearing comprises a cylindrical bearing seat surrounding a ship stern shaft and a permanent magnet assembly detachably connected with the bearing seat, a cylindrical sliding bearing is arranged on the inner side of the bearing seat, a notch is formed in the outer side face of the sliding bearing, and the permanent magnet assembly is detachably connected with the bearing seat; the notch penetrates through the sliding bearing in the axis direction of the sliding bearing, a containing groove used for containing the permanent magnet assembly is defined between the notch and the inner side wall of the bearing seat, when the water lubrication bearing is arranged on the outer side of the ship tail shaft in a sleeving mode, the containing groove is located over the ship tail shaft, and the permanent magnet assembly is in sliding fit with the containing groove in the axis direction of the sliding bearing. According to the scheme, the permanent magnet is configured to be in a detachable form, and the permanent magnet can be conveniently maintained after being demagnetized, so that the maintenance cost of the water-lubricated bearing is reduced, and the load of the water-lubricated bearing can be reduced for a long time.

The invention particularly provides a thermal elastohydrodynamic lubrication reliability evaluation method for a wind power sliding bearing. The method comprises the following steps: acquiring evidence measurement combination parameters; converting the evidence measurement combination parameters into probability measurement combination parameters, and determining mean value data of the probability measurement combination parameters; constructing a sample collection center based on the probability measurement combination parameters, substituting the sample collection center into the thermal elastohydrodynamic oil film iteration analysis model, and outputting minimum oil film thickness data; constructing a quadratic polynomial response surface function based on the current oil film safety threshold value, and selectively updating the sample collection center based on the quadratic polynomial response surface function to enable the sample collection center to approach the maximum possible failure focal element; determining credibility data and likelihood data of thermal elastohydrodynamic lubrication of the wind power sliding bearing based on the maximum possible failure focal element; and changing an oil film safety threshold value, and circularly executing the steps to obtain a thermal elastohydrodynamic lubrication reliability analysis result of the wind power sliding bearing. The accuracy of reliability is ensured, and the calculation cost is reduced.

The invention relates to a hydrophilic and hydrophobic controllable magnetorheological rubber-foam metal bearing which is characterized in that a magnetorheological rubber-foam metal shaft sleeve is uniformly divided into n arc-shaped section units along the circumferential direction, and i water film sensors are arranged in each arc-shaped section unit along the axial direction of the magnetorheological rubber-foam metal shaft sleeve, two copper electrodes are led out from two ends of each water film sensor; j electromagnetic coils are arranged outside each arc-shaped section unit in the axial direction of the magnetorheological rubber-foam metal shaft sleeve, the two poles of each electromagnetic coil are fixed to the periphery of the magnetorheological rubber-foam metal shaft sleeve, gaps between the adjacent electromagnetic coils and the bearing shell are filled with iron blocks, and the iron blocks and the electromagnetic coils form a magnetic flux loop; the problems that due to the fact that the shaft sleeve material performance and the interface lubricating state of a traditional rubber bearing cannot be adjusted, the bearing capacity of a water-lubricated rubber bearing is insufficient, the hydrophilicity and hydrophobicity of a lubricating interface cannot be adjusted, noise reduction and abrasion resistance are insufficient, and performance improvement of a rubber sliding bearing is limited are solved.

The invention relates to the technical field of bearing pedestals, and discloses a sliding bearing pedestal which comprises a lower outer ring, an upper outer ring, a lower bearing bush and an upper bearing bush, a cooling pipe is arranged in a containing groove, the outer surface of a turbulent flow shaft is fixedly sleeved with a plurality of turbulent flow blades, and the end, located in a turbulent flow box, of a movable rod is fixedly connected with a rack. The outer surface of the transmission shaft is fixedly sleeved with a transmission gear, one side of the connecting plate is fixedly connected with a triangular block, and the outer surface of the upper bearing bush is fixedly connected with a shifting rod. When the upper bearing bush rotates, a shifting rod is driven to be matched with a triangular block, extrude a connecting plate and enable a rack to move, and is matched with a transmission gear, a driving bevel gear and a driven bevel gear, so that a turbulent flow shaft drives turbulent flow blades to rotate to turbulent flow cooling water in the cooling pipe, and the heat exchange speed between the cooling water in the cooling pipe is increased; the cooling water is fully subjected to heat exchange with heat generated when the bearing seat works, so that the heat exchange efficiency is greatly improved.

The invention discloses a sliding bearing health monitoring and equipment fault diagnosis system and method based on digital twinning, and relates to the field of fault prediction and health management. In order to solve the problems that in the prior art, the influence of bearing abnormity or a sub-health state on the health of an equipment shafting cannot be judged, and time accumulation fault prediction of the sub-health state on dynamic characteristics and abrasion of a liquid film cannot be quantified, bearing displacement and rotating speed are collected through an eddy current and rotating speed sensor; solving a Reynolds equation and an Archard wear equation through multi-physics field simulation coupling, and generating a sample library of pressure, film thickness, rigidity damping and wear loss; the displacement, the rotating speed and the load are mapped to liquid film parameters and dynamic characteristics in real time through a POD-Kriging reduced-order model; and based on the film thickness ratio and the 0.5 X frequency amplitude grading lubrication state, vortex motion early warning is triggered according to the rotating speed ratio, and bearing health state all-parameter monitoring and multi-stage safety early warning are achieved. The method has a good application prospect in the field of intelligent operation and maintenance.

A spindle drive for a vehicle steering gear, including a spindle having an external thread and a spindle nut having an internal thread being guided on the external thread. One of the spindle and spindle nut is rotatable and produces a corresponding translational movement of the other. The other of the spindle and spindle nut is guided via a plain bearing along the axis of rotation relative to a fixed structural part. The plain bearing is formed between sliding surfaces of a first and second bearing part, the first being provided on the other of the spindle and spindle nut and the second being provided on the fixed structural part. One of the first and second bearing parts is designed as an elevation, the other being designed as a recess. The recess surrounds the elevation on both sides in a rotational direction.

The invention belongs to the technical field of wind driven generator main bearing test equipment, and discloses a five-degree-of-freedom wind driven generator main bearing test bench for simulating real working conditions, which comprises a loading system, a test system and a driving system. The loading system adopts a sliding bearing loading disc to simulate a hub of the wind driven generator, and adopts a hydraulic cylinder array to simulate five-degree-of-freedom hub loads of three-direction forces including axial force, radial force and vertical force and two-direction moments including pitching moment and yawing moment. The test system adopts a two-point supported tapered roller bearing main shaft system to simulate the main shaft configuration of the wind driven generator, and can be independently disassembled to replace the model of a test bearing. The driving system adopts a variable-frequency and variable-speed motor, the rotating speed range is 0-200 rpm, and the requirements of various working conditions such as frequent start and stop, performance tests and strengthening tests can be met. According to the invention, through multi-dimensional load loading and multi-working-condition simulation, a key platform is provided for reliability test and failure mechanism research of the wind power main bearing.

The invention provides a sliding bearing oil film lubrication reliability evaluation method, and relates to the field of oil film lubrication reliability diagnosis, and the method comprises the steps: building a minimum film thickness limit state function according to a bearing minimum oil film thickness calculation equation and a preset minimum oil film thickness threshold value, and determining a reliability domain, iteratively solving the minimum oil film thickness through an elastohydrodynamic lubrication equation, and solving a non-probabilistic reliability index and designing a checking point through a numerical optimization algorithm; according to a non-probability reliability index, designing a checking point and a relation between an uncertain domain and a reliable domain to judge a joint focal element needing extreme value analysis, inheriting maximum and minimum values of the joint focal element by using an intelligent genetic method, and obtaining credibility and likelihood under a threshold value; and according to the above steps, obtaining the credibility and the likelihood under each minimum oil film thickness threshold value, and determining an accumulated credibility function curve and an accumulated likelihood function curve used for evaluating the reliability degree. In this way, focal elements needing extreme value analysis are reduced, and the efficiency of evaluating the lubricating reliability of the oil film of the sliding bearing is improved.

The invention relates to a sliding wear performance evaluation method of a sliding bearing, a sliding wear testing machine and application. The method comprises the following steps: acquiring initial-state benchmark characterization of a sliding bearing sample, placing the sliding bearing sample at a test station of the sliding wear testing machine, outputting lubricating oil, collecting a process oil sample, and acquiring final-state characterization of the sliding bearing sample after the test is completed; on the basis of initial state benchmark characterization, process oil sample analysis data, final state characterization and working condition parameters applied by a sliding wear testing machine, the wear stage and the wear mechanism are analyzed, and the sliding wear performance of the sliding bearing is evaluated; a sliding shaft supporting module, a rotating power module, an oil supply lubricating module and a radial load pressurizing module are arranged on the testing machine matching platform; the method is applied to wear resistance evaluation of sliding bearings prepared by adopting different processes. According to the invention, the core working condition of the actual dynamic pressure bearing is accurately reproduced, the stability and durability of the test system are improved, and the occurrence, development and evolution process of wear is visualized and quantifiable.

The invention provides a thrust sliding bearing, a shaft system and a wind generating set. The thrust sliding bearing comprises a thrust disc, a thrust supporting disc and a first bearing bush. The thrust disc is arranged on the rotating shaft and protrudes outwards in the radial direction relative to the rotating shaft; the thrust supporting part is opposite to the thrust disc in the axial direction of the rotating shaft, and the bearing bush assembly is fixedly installed on the axial side surface of the thrust disc, makes sliding contact with the thrust supporting part and can rotate along with the thrust disc. According to the thrust sliding bearing provided by the embodiment of the invention, the bearing bush assembly is fixedly mounted on the thrust disc, when the bearing bush assembly needs to be maintained or replaced, the thrust disc can be driven to rotate through the rotation of the rotating shaft, and under the condition, the bearing bush assembly can rotate along with the thrust disc, so that the bearing bush assembly can rotate along with the thrust disc; when the bearing bush assembly needs to be replaced, the bearing bush assembly needing to be replaced can be rotated to the upper non-load point, so that the bearing bush assembly can be detached from the rotating shaft under the condition that the bearing bush assembly needing to be replaced does not bear load, and the operation and maintenance difficulty can be remarkably reduced.

The invention discloses a self-balancing tilting-pad thrust bearing, and relates to the field of sliding bearing design. In order to solve the problems that when an existing thrust bearing is applied to the working condition that a mechanical rotor rotates at a high speed, the axis of the rotor is likely to deflect due to machining quality, self vibration and the like, then a bearing bush of the thrust bearing is stressed unevenly, unbalance loading is generated, and the service life of the thrust bearing is shortened. A double-layer balance block structure is adopted to automatically adjust the stress state of the thrust pads, so that each thrust pad is in uniform contact with the thrust disc, uniform stress among the thrust pads is realized, and the dynamic stability of a mechanical rotating system is improved; the thrust bearing structure can automatically adjust the problem of unbalanced stress between tilting pads of a sliding thrust bearing caused by manufacturing errors, assembly errors and stress states, the reliability and maintainability of the thrust bearing are improved, and the service life of the thrust bearing is prolonged. The invention is suitable for the technical field of thrust bearings.

The invention discloses a sliding bearing health management system and method based on vibration analysis, and relates to the field of sliding bearing health management, and the method comprises the steps: firstly obtaining an original vibration signal and a real-time working condition parameter of a sliding bearing, and carrying out the multi-domain feature extraction of the vibration signal after time sequence alignment and windowing processing; and then introducing a double-flow attention coding mechanism, performing deep interaction and joint coding processing on the extracted vibration multi-domain features and working condition feature vectors, and further performing adjustment and decoding reconstruction on the joint potential space representation by taking the real-time working condition feature vectors as dynamic conditions, thereby generating a theoretical healthy vibration mode under the current working condition. And comparing the vibration with the actual vibration to calculate the health index. In this way, dynamic self-adaption of the health assessment standard can be achieved, and therefore the accuracy and robustness of health management under complex and changeable working conditions are remarkably improved.

The invention relates to the technical field of wind turbines, and particularly provides a sliding bearing system and a maintenance method thereof.The sliding bearing system comprises a pair of radial sliding bearings located at the hub end and the gearbox end of a main shaft respectively, and the main shaft is rotatably connected to a cabin through the pair of radial sliding bearings; the axial sliding bearing is located on the opposite outer side of the gear box end of the main shaft, and the axial sliding bearing is connected with the cabin and the main shaft; the axial sliding bearing includes an annular plate detachably connected to the gearbox end of the main shaft and a number of caliper slider modules arranged spaced apart from each other along a circumferential direction of the annular plate and detachably connected to the nacelle and each releasably clamping the annular plate. Through the configuration, the caliper type sliding block module can loosen and clamp the annular plate, so that the caliper type sliding block module can be loosened and further pulled out from the annular plate, and the axial sliding bearing with the replaceable sliding blocks on the two sides is realized.

The invention discloses a preparation method of graphene-coated aluminum oxide nanoparticles and a reinforced copper-based composite material thereof, and belongs to the field of metal-based composite materials, graphite flakes are stripped into graphene through a wet ball-milling one-step method, the graphene coats the surfaces of aluminum oxide particles, then the graphene is mixed with nano copper powder, and the mixture is formed through a powder metallurgy process; according to the method, the traditional multi-step process is simplified, and the composite material has high wear resistance and excellent functional characteristics by utilizing the lubricity and electric conductivity / thermal conductivity of graphene, and is suitable for the high-end fields of heat dissipation of electronic devices, sliding bearings and the like.

The invention belongs to the technical field of sliding bearings and protection thereof, and discloses a metal radial elastic sheath for a ceramic sliding bearing under a high-temperature working condition, and the sheath comprises an inner sheath and an outer sheath; the inner sheath sleeves the periphery of the ceramic bushing, is a thin-wall metal sleeve, and is provided with a plurality of spiral openings in the circumferential direction, so that the inner sheath generates elastic bending when being stressed in the radial direction and disperses stress in the annular range; the outer sheath is sleeved on the periphery of the inner sheath, helical teeth are uniformly distributed on the inner circumferential surface of the outer sheath, and the helical teeth apply centripetal acting force to the inner sheath through radial elastic deformation under assembly and high-temperature working conditions. Through flexible deformation of the spiral opening of the inner sheath and radial elastic pre-tightening fit of the helical teeth of the outer sheath, fastening fit can be maintained when a thermal expansion difference exists between the metal bearing seat and the ceramic bushing, stress concentration of the ceramic bushing is reduced, and the risk of axis drift is reduced.

A sliding bearing dynamic load measuring method belongs to the technical field of mechanical transmission. In order to solve the problems of low accuracy and low precision of the existing dynamic load measurement of the bearing, the method comprises the following steps of: measuring a bearing load value of a calibration point by adopting a loading measurement calibration device, and fitting the bearing load value into a voltage-load calibration curve; the resistance strain gauge is arranged at the stress sensitive position of the bearing seat, and when the resistance strain gauge generates a variable resistance value due to the deformation of the bearing seat, the strain bridge outputs a voltage signal; and according to a voltage signal output by the strain bridge, a corresponding load value, namely a dynamic load measurement value, is obtained in a voltage-load calibration curve. The device is used for carrying out load measurement on the bearing.

A bearing assembly for a cone crusher includes an inner slide bearing, an eccentric sleeve and an outer slide bearing arranged for supporting a lower portion 5 of a crushing head shaft. The inner slide bearing has a diameter D1 and an axial height H1 being defined from the inner slide bearing upper end to the inner slide bearing lower end. The outer slide bearing 40 has a diameter D2 and an axial height H2 being defined from the outer slide bearing upper end to the outer slide bearing lower end 40b. A ratio of the inner slide bearing axial height and its diameter H1 / D1 is in the range of 0.95 to 1.20. A cone crusher including the bearing assembly is also provided.

[Problem] Reduction of the stirring resistance that arises in a motor in a coolant circulation system in which an oil-containing coolant circulates to cool and lubricate the motor.[Means of solution] A coolant circulation system 100 comprises: a motor 4 with a rotor 41, a stator 42, a rotating shaft 43 and plain bearings 44; a gas-liquid separator 12, which separates a coolant into CO2 and oil; a CO2 passage 22b, through which the CO2 separated by the gas-liquid separator is supplied to a gap between the rotor and the stator to cool the rotor and the stator; mixing channels 24a, through which a mixture of the CO2 and the oil, obtained by mixing the CO2 and the oil separated by the gas-liquid separator, is supplied to gaps between the rotating shaft and the plain bearings to lubricate the plain bearings; and mixing channels 24b, through which the CO2 supplied to the rotor and the stator from the CO2 channel 22b and the mixture of CO2 and oil supplied to the sliding bearings 44 from the mixing channels 24a are returned to the gas-liquid separator.

The invention relates to an underwater propeller, in particular to a small underwater shaftless propeller which comprises a shell, a motor assembly, an upper cover and a lower cover, a water inlet and a water outlet are formed in the middle of the lower cover and the middle of the upper cover respectively, the motor assembly comprises a stator and a rotor, propeller blades are arranged in the rotor, the stator is annular and is arranged in a sealing sleeve, and the sealing sleeve is arranged in the shell. One end of the sealing sleeve is opened, and the opening is covered and sealed by the upper cover to form a sealed cavity; water permeable holes are formed in the lower cover close to the water inlet and the upper cover close to the water outlet, the water inlet and the water outlet are each provided with a structural part, a sliding bearing assembly is arranged between the structural parts and the rotor, a gap I is formed in the sliding bearing assembly, and the gap I and the water permeable holes are communicated to form a water lubrication passage; a gap II is formed between the outer peripheral wall of the rotor and the inner ring wall of the sealing sleeve; and the gap II is communicated with the water permeable hole to form a water cooling passage. The device has the characteristics of high reliability, long service life and low maintenance cost, and is suitable for being applied to an underwater environment.