877 results about "Main bearing" patented technology

The invention relates to the technical field of modeling, in particular to an aero-engine main bearing kinetic model correction method based on sensitive feature fusion, which comprises the following steps: constructing an aero-engine main bearing kinetic model; simulation data are generated according to the collected actual measurement data, time-frequency domain features of the actual measurement data and the simulation data are extracted, and an initial feature set is constructed; based on a binary improved horse swarm optimization algorithm, sensitive features are screened out from the initial feature set, a sensitive feature set is constructed, a component matrix coefficient of the sensitive feature set is calculated in combination with a principal component analysis method, and a fused sensitive feature expression is obtained; calculating fusion sensitive features of the measured data and the simulation data by using the fusion feature expression, and taking a difference calculation formula of the two as a target function for model correction; and performing optimization based on a horse group optimization algorithm and the target function, updating model parameters of the aeroengine main bearing dynamic model, and realizing correction of the aeroengine main bearing dynamic model.

The invention relates to the technical field of gas bearings, in particular to a refrigerant foil dynamic pressure gas radial bearing capacity estimation method and system.The method comprises the steps that the working temperature, the working pressure, the bearing diameter and the rotating speed when a bearing works are obtained, and a refrigerant medium is determined; obtaining the dynamic viscosity of the refrigerant according to the working temperature, the working pressure and the refrigerant medium; according to the bearing diameter, the rotating speed, the refrigerant dynamic viscosity and the main structure parameters of the bearing, a bearing capacity estimation formula of the bearing is constructed; performing iterative optimization on the main structure parameters of the bearing according to a bearing capacity estimation formula of the bearing to obtain optimal structure parameters; the main structure parameters of the bearing subjected to iterative optimization comprise the bearing length, the bearing nominal clearance and the eccentricity rate. According to the method, the bearing capacity of the bearing is estimated by selecting different bearing lengths, bearing nominal clearances and eccentricity ratio combinations, so that main structural parameters of the bearing are designed, the bearing capacity of the bearing meets the requirements, and the running eccentricity ratio is within a reasonable range.

The invention discloses a vehicle body protection structure and a vehicle. The vehicle body protection structure comprises a vehicle frame longitudinal beam, a doorsill and a protection piece. A doorsill is arranged on at least one side of the frame longitudinal beam, a first gap is formed between the frame longitudinal beam and the doorsill, and at least part of the protection piece is arranged in the first gap. The protective part is arranged between the doorsill and the longitudinal beam, side face supporting is provided for the doorsill, the possibility that the doorsill turns over and deforms in the collision process is reduced, and the doorsill can be fully crushed and deformed when bearing side face collision; meanwhile, the protection piece can transmit side collision force borne by the threshold to the frame longitudinal beam, the high-strength frame longitudinal beam is used as a main force bearing part, the collision deformation of the vehicle body can be reduced, and therefore the safety of the vehicle is effectively protected.

The invention discloses an aviation generator with a self-stabilizing function, and relates to the technical field of aviation generators, the aviation generator comprises a casing, a driving device, a cooling device and a soaking device, the casing is used as a main bearing main body and is used for mounting other devices, the driving device is mounted through a driving cavity, and the cooling device is used for cooling the cooling device; the driving device is used for converting external input torque into electric energy to be stored, the cooling device is used for cooling the whole machine, the soaking device is used for assisting in adjusting the temperature of oil liquid, the proportion of the cooled oil liquid is adjusted according to the temperature rising conditions of the oil liquid under different working conditions, and therefore the final oil liquid temperature is adjusted. And the temperature of the oil entering the circulation again tends to be stable.

The invention provides an innovative design of a corrugated pipe damper integrated on a sliding main bearing aiming at the problems of transmission system abrasion and fatigue damage caused by vibration energy accumulation of the wind power main bearing under a complex wind load, and belongs to the technical field of wind power generation equipment. A traditional main bearing damping structure is low in energy absorption efficiency, insufficient in dynamic response and difficult to effectively suppress vibration. Through collaborative design of a corrugated pipe multi-stage laminated structure and a fluid energy dissipation channel, a composite mechanism for dynamically dissipating vibration energy is formed. The core of the damping device is composed of a corrugated pipe assembly, damping cavities and a main shaft adaptive structure, impact energy is absorbed through axial flexible deformation of the corrugated pipe, vibration attenuation is achieved in combination with reciprocating flowing of damping fluid in the multiple cavities, and low-frequency swing and high-frequency harmonic waves of a main bearing are synchronously restrained. According to the design, the bearing capacity is guaranteed, vibration transmission is remarkably reduced, the service life of the main bearing is effectively prolonged, the operation reliability of a unit is improved, and the damping requirement of a core transmission system of a high-power wind turbine generator is met.

The present invention makes it possible to inhibit the enlargement of a lubrication region in a speed reducer including a sealing member. The speed reducer includes a case, a carrier, main bearings, and a sealing member. The carrier is located at least partly inside the case. The main bearings are located between the case and the carrier. The sealing member includes a first ring, a second ring, and a first elastic ring. The first ring is annular and mounted to one of the case and the carrier. The second ring contacts an annular region of the first ring. The first elastic ring is compressed between the second ring and the other of the case and carrier. The sealing member is located at least partly in the same region as the main bearings in the radial direction perpendicular to the rotation axis of the carrier rotating relative to the case.

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 belongs to the technical field of wind turbine generators, and particularly relates to a wind turbine generator fault early warning and abnormal parameter inspection method comprising the following steps: collecting historical operation data of a wind turbine generator, analyzing the data, and establishing a data model; the historical data comprises operation data of a generator, a gear box, a main bearing, a variable pitch system and an electrical system; vibration spectrums of a gearbox and a generator rotating part are monitored through an acceleration sensor to identify whether bearing pitting corrosion, gear tooth breakage mechanical faults and frequency are abnormal or not; an on-line monitoring device is installed in an oil way of the wind turbine generator to monitor the oil state in real time. The temperature of the gearbox and the bearing is detected through the thermal infrared imager, and whether the temperature is abnormal or not is monitored; abnormal sound signals of blade cracks or bearing early damage are captured through an ultrasonic sensor, and the blade is judged.

The invention discloses a three-fulcrum engine compact type main load-bearing structure rigidity design method and application, and the method comprises the steps: firstly, carrying out the iterative optimization design of the determined rotor structure fulcrum rigidity, and determining the rigidity of each fulcrum; secondly, the static strength of the initial stator assembly and the stiffness of each fulcrum are analyzed, if the static strength and fulcrum stiffness requirements are not met, the stator assembly is optimized, and a stator assembly structure determined for the first time is obtained after optimization is completed; then, the coaxiality of all supporting points of the stator assembly determined for the first time is analyzed, if the requirement is not met, the main bearing structure is optimized, and a stator assembly structure determined again is obtained after optimization; finally, static strength and fulcrum rigidity analysis is conducted on the stator assembly determined again, if the requirements are met, the final stator assembly structure is obtained, and if not, iterative optimization is conducted. The vibration performance and the structural reliability of the whole machine can be remarkably improved, and the method is suitable for engineering design of aero-engines, gas turbines and the like.

A strain wave gearing (1) is configured to have a unitized structure having a main bearing (5) that supports an internally toothed gear (2) and an externally toothed gear (3) in a manner that allows relative rotation, and an output flange (6) that is linked to the externally toothed gear (3). The externally toothed gear (3) is formed in the shape of a wine glass and ensures a large hollow diameter, which is required in cases where the externally toothed gear (3) is incorporated into a robot joint part or the like. A strain gauge (101) of a torque sensor (100) is attached to an outward-facing end surface portion of the output flange (6) linked to the externally toothed gear (3). The torque sensor (100) is capable of precisely detecting rotational torque without being affected by flexing of the externally toothed gear (3), and elements such as the strain gauge (101) are not exposed to oil, grease, or the like.

The invention discloses a magnetic suspension force determination method and device, a storage medium and a computer program product, and relates to the field of wind power engineering, and the magnetic suspension force determination method comprises the steps: determining the maximum bending moment force which can be resisted by a wind wheel according to the maximum wind power and the farthest force arm borne by the wind wheel in the rotation process of a historical time period; the size of a permanent magnet in the passive magnetic suspension bearing is determined according to the maximum bending moment force and the weight of the wind wheel, the fixed part of the passive magnetic suspension bearing is arranged on the outer side of the wind wheel, and the rotating part of the passive magnetic suspension bearing is arranged on the inner side of the wind wheel; the magnetic suspension force of the passive magnetic suspension bearing is determined according to the size of the permanent magnet, and the magnetic suspension force is used for suspending the wind wheel at the target height. By the adoption of the technical scheme, the problem that in the prior art, due to the fact that the main bearing of the vertical-axis wind turbine makes contact with the wind wheel, the main bearing bears huge loads, and mechanical abrasion of the main bearing is caused is solved.

The invention relates to the technical field of injection molding devices, in particular to an automobile interior trim part injection molding integrated forming device which comprises an injection molding machine, a position control mechanism arranged on the injection molding machine, a pushing mechanism arranged on the position control mechanism, a chip removal mechanism arranged on the pushing mechanism and two mold end grinding mechanisms arranged on the chip removal mechanism. The position control mechanism comprises a top plate, a supporting plate and a hydraulic part arranged in the supporting plate. The position control mechanism which can be finely adjusted to provide suspension is arranged on a top plate of a traditional double-colored plastic injection machine, the position control mechanism serves as a main bearing platform of the two sets of mold end grinding mechanisms at the moment, and the end faces of the two molds can be attached by the two sets of mold end grinding mechanisms along with closing of the upper mold towards the lower mold; rusty spots on the end surface of the mold are cleaned under the pressurization of the position control mechanism, so that effective rust removal operation on the end surface of the mold in a narrow gap in the injection molding machine is effectively ensured.

A motor system includes: a stator connected to a case of a motor; main bearings connected to the case; a main shaft rotating on the main bearings; a rotor mounted on the main shaft and rotating relative to the stator; and at least one of a magnetic flux reducing circuit element and a conductive rolling-element device disposed inward of the main bearings and closer to the stator and the rotor than the main bearings and reducing flow of bearing current through the main bearings.

The invention discloses a spherical roller bearing entity simulation method, device and equipment and a medium, and relates to the technical field of wind power generation. According to the scheme, when the finite element mesh model of the spherical roller bearing is constructed, the rollers are connected to the bearing inner ring and the bearing outer ring through the spring units, that is, traditional finite element constraint is replaced with the mode that the rollers are constrained through the spring units, and the conventional constraint limitation in finite element simulation is broken through; accurate analysis of bearing roller contact in a complete machine model is realized; after a complete machine finite element mesh model is generated based on a model of the spherical roller bearing, simulation parameters and loading parameters of the complete machine finite element mesh model are set, the simulation parameters at least comprise a working clearance between a roller and a raceway, that is, contact offset is added to simulate the existence of the radial clearance of the bearing, and the loading parameters of the complete machine finite element mesh model are set. The problem of simulation of play contact of the SRB main bearing under the working condition of high axial force is solved, and three-dimensional balance of physical authenticity, calculation efficiency and engineering applicability is achieved.

The invention discloses a magnetic suspension water-lubricated hybrid bearing, which comprises a magnetic suspension bearing and a water-lubricated bearing, the magnetic suspension bearing comprises a stator core, a stator coil and an insulating pouring sealant, the water-lubricated bearing comprises a bushing and a bearing bush, and the magnetic suspension water-lubricated hybrid bearing also comprises an intelligent monitoring and control system consisting of a power amplifier, a controller, a displacement sensor and a circuit thereof; when the magnetic conductive metal material rotating shaft supported by the magnetic suspension bearing and the water lubricated bearing is in working conditions such as starting, stopping, low speed or overload, the controller controls the power amplifier to enable the magnetic suspension bearing to enter a working state to provide main bearing force for the rotating shaft, and friction and abrasion of the bearing bush are effectively reduced; when the rotating shaft is in a high-speed and stable working condition, the controller controls the power amplifier to reduce the current and the electromagnetic force of the magnetic suspension bearing, so that the supporting effect of the magnetic suspension bearing is weakened, the water-lubricated bearing is in a stable hydrodynamic lubrication stage, main bearing force is provided for the rotating shaft, and the power consumption of the magnetic suspension bearing is effectively reduced.

The invention relates to a tool for testing mechanical sealing performance. The tool comprises a main shaft, the bearing module comprises a bearing box and a bearing cover which are in sealed connection with each other, and a cavity wrapping part of the main shaft is formed in the bearing box and the bearing cover; the mechanical sealing module is arranged on the outer wall of the section, penetrating through the cavity, of the main shaft; the adjusting ring structurally comprises a core shaft and an outer ring which are connected with each other, and the core shaft and the main shaft are connected and rotate synchronously; the sealing test module comprises a sealing tank which is connected to the end part of the bearing box in a sealing manner, the sealing tank is connected with an adjusting screw which is located on the same axis with the main shaft, and the adjusting screw abuts against the adjusting ring and spirally controls the adjusting ring to axially move along the cavity; and an environment simulation module. The device is compact and reasonable in structure and convenient to operate, the actual working conditions of short-time operation in a high-temperature air environment and long-time operation in a high-pressure deepwater environment can be effectively simulated, and the performance and the service life of the mechanical sealing module under different environment conditions are evaluated.

The utility model discloses a large-cylinder-diameter diesel engine main bearing cap dismounting device which comprises a hoisting unit, lower sliding rail assemblies and a main bearing cap supporting unit, hoisting sliding rail assemblies of the hoisting unit are fixed to the two sides of the upper portion of a rack, and the lower sliding rail assemblies are supported on oil pan rib plates respectively. Supporting rods of the main bearing cover supporting unit are vertically supported at the two ends of the beam respectively, the upper ends of the supporting rods are fixedly connected with the lower ends of main bearing cover screws respectively, the lower ends of the supporting rods are hinged to the two ends of the beam respectively, and a top block of the main bearing cover supporting unit is fixedly connected with the center of the lower side of the main bearing cover. According to the main bearing cap dismounting device, the working efficiency of dismounting the main bearing cap and the operation safety are remarkably improved, the labor intensity of dismounting the main bearing cap is greatly reduced, and the problem of dismounting the main bearing cap of a large-cylinder-diameter diesel engine is solved.

The utility model relates to a multi-size wafer spin-drying mechanism and a wafer cleaning system, the multi-size wafer spin-drying mechanism comprises a workbench, a spin-drying assembly and a spraying assembly, the spin-drying assembly comprises a rotating motor, a main shaft, a bearing disc, a supporting column and a blocking column, and the rotating motor is connected with the bearing disc through the main shaft; the top end of the bearing disc is provided with at least one set of supporting columns capable of supporting the bottom end face of a wafer and at least one set of blocking columns capable of limiting the edge of the wafer, and the blocking columns are correspondingly arranged on one sides of the supporting columns and higher than the supporting columns. The spraying assembly comprises a swing rod air cylinder and a spraying head, the swing rod air cylinder is connected with the spraying head, and the spraying head is correspondingly arranged above the bearing disc. The multi-size wafer spin-drying mechanism and the wafer cleaning system can be used for cleaning and spin-drying wafers of various sizes or types, multiple purposes are achieved, the application range of the cleaning system is greatly widened, meanwhile, liquid splashing during spin-drying can be avoided, and the surrounding environment of equipment is guaranteed.

The invention discloses a self-clearance-eliminating cycloidal pin gear speed reducer, and aims to solve the double pain points that in the prior art, an assembly clearance is difficult to control, and the clearance cannot be compensated after abrasion. The speed reducer comprises a machine shell, a main bearing, an output flange, a cycloidal gear, a conical pin and an elastic pressing piece, and is characterized in that the conical pin, cycloidal teeth of the cycloidal gear and a pin groove of the machine shell are all provided with the same taper, the elastic pressing piece is installed on the machine shell and exerts pre-compression force on the pin, and the elastic pressing piece, the conical pin and the pin are made to be tightly attached to eliminate an initial gap; after abrasion, the elastic pressing piece can push the conical pin needle to conduct self-adaptive gap compensation along the conical surface, and the meshing stability is guaranteed through the taper self-locking characteristic. Meanwhile, the structure can be flexibly matched with three transmission modes of'a first-stage planetary gear and a second-stage cycloid ', 'single-stage cycloid cam shaft driving' and'single-stage cycloid cam shaft and a cross slide block ', the effects of reducing machining and assembling cost, maintaining transmission precision for a long time and reducing maintenance loss are achieved, and the structure is suitable for the field of precision transmission.

The invention provides a special-shaped steel formwork bending area polishing treatment device and method, and belongs to the technical field of polishing treatment, and the device comprises an assembling unit, a bearing plate, a bending polishing unit and a main body polishing unit. The assembling unit comprises an assembling plate and a connecting base, and the connecting base is arranged on the assembling plate in a sliding mode. The bearing plate is arranged on the connecting base in a liftable mode, and a posture adjusting rotating shaft is arranged on the side, away from the connecting base, of the bearing plate. The bending and polishing unit comprises a bending bearing seat and a detection plate. The main body grinding unit comprises a main body bearing seat and a grinding driving assembly. According to the grinding treatment device and method for the bending area of the special-shaped steel formwork, the grinding efficiency and grinding quality of the bending area of the special-shaped steel formwork can be improved.

The utility model relates to the technical field of pump shell machining, in particular to a pump shell machining system which comprises a fixing mechanism, a machining mechanism and a rotating mechanism. After an operator firstly places a machined pump shell on the main bearing bottom plate and fixes the pump shell through the fixing mechanism, the turning and rotating mechanism enables the machining mechanism to be arranged in a working area, a die cutter on the machining mechanism is used for cutting, meanwhile, the angle and the position of the die cutter can be adjusted in the cutting process, and the machining efficiency is improved. The inner cavity of the pump shell is conveniently and more conveniently milled, the implementation process of repeatedly replacing the tool bit during milling of the circular inner wall of the pump shell is effectively achieved, good practicability and economical efficiency are achieved, and application and popularization of equipment are facilitated.

The invention relates to a main bearing locking nut anti-loosening structure and an aero-engine, belongs to the technical field of aerospace, and solves the problem of unreliable mechanical anti-loosening locking of a locking nut in the prior art. The anti-rotation device comprises a locking nut, a locking plate and an anti-rotation sleeve which are arranged outside a shaft neck of an engine rotating shaft in a sleeving mode. The locking nut fixing section is fixed to the shaft neck, and a first groove is formed in the outer portion of the clamping section in the circumferential direction. The locking plate comprises a locking plate main body, a first tooth and a second tooth; the first tooth is embedded into the first groove to limit the circumferential movement of the locking nut; the anti-rotation sleeve fixing part is connected with the shaft neck; the inner wall face of the anti-rotation part is attached to the outer wall face of the locking nut and the outer wall face of the locking piece. And the end part of the anti-rotation part is provided with a notch which is mutually embedded with the second tooth. Triple locking of the main bearing locking nut can be achieved, locking is reliable, and the structure is simple.

The invention relates to an inclined shaft TBM disassembly construction method. The method comprises the following steps that firstly, an adjustable supporting frame is arranged at the bottom of an inclined shaft; step 2, reversely disassembling each component according to the sequence of a cutterhead driving part, a main bearing, a shield and a thrust cylinder; thirdly, in the disassembling process, a hydraulic jacking device and a monorail hoist work cooperatively to conduct component hoisting; fourthly, a temporary transportation channel is formed in the side wall of the inclined shaft; fifthly, after every two parts are disassembled, steel arch supports are erected in the corresponding areas; and sixthly, the disassembled parts are transported outwards through a wheel type transport vehicle along an inclined shaft track. Through cooperative control of the multi-stage supporting system and the dynamic disassembling sequence, the stability of the inclined shaft structure is effectively guaranteed, the disassembling efficiency and the transportation safety of large-size components are remarkably improved by combining the design of the transportation channel with precise positioning and optimization of a braking system, and the method is suitable for rapid disassembling and transferring operation of TBM equipment in inclined shaft tunnel engineering.

The invention discloses a transmission system of a wind turbine generator, which comprises a main shaft system comprising a main bearing seat and a main shaft, and the main shaft is arranged in the main bearing seat through a front bearing and a rear bearing respectively; the wind power gear box comprises a first-stage planet assembly, a front middle box body, a second-stage planet assembly, a rear middle box body, a third-stage planet assembly and a motor bearing seat which are sequentially arranged, the first-stage planet assembly comprises a first-stage planet carrier and a first-stage inner gear ring, at least one part of the first-stage planet carrier is installed in the front middle box body, and the upwind direction end face of the first-stage planet carrier is connected with a main shaft; an outer spigot is arranged on the downwind end face in the circumferential direction, and an inner spigot is arranged in the front middle box body in the circumferential direction. On the other hand, the invention further discloses an assembling method of the transmission system of the wind turbine generator. According to the transmission system, the outer seam allowance and the inner seam allowance are formed in the first-stage planet carrier and the front middle box body, the first-stage planet carrier is supported, and the risk that a first-stage planet assembly directly falls on a first-stage inner gear ring, and consequently the tooth surface is crushed is avoided.

The invention discloses a bearing cable fixing structure which comprises a base. The first supporting plate is arranged on the base; the fastening device comprises a fixing part and a locking part, the fixing part is used for bearing the bearing cable, a sliding groove is formed in the first supporting plate, the fixing part is slidably connected to the first supporting plate through the sliding groove so as to adapt to the angle of the bearing cable by adjusting the position of the fixing part on the sliding groove, and the locking part is used for fixing the fixing part to the first supporting plate. According to the bearing cable fixing structure provided by the invention, the fixing part of the fastening device is used for bearing and fixing the bearing cable, the position of the fixing part on the sliding groove is adjusted to adapt to the bearing cables with different angles, and then the fixing part is locked and fixed through the locking part, so that main bearing cables with different angles are fixed; and the fixing difficulty of the bearing cable bracket on the bearing cable is reduced. The invention further discloses a bearing cable support.

The utility model discloses a four-side shaping machine. A first shaping device and a second shaping device are arranged on a rack; the first shaping device is structurally characterized in that four rotating shafts are vertically supported and arranged at corners where four edges of the rack are located through corresponding main bearing seats; a swinging arm group is fixedly arranged on each rotating shaft, and a shaping door is arranged at the end part of the swinging arm group on each rotating shaft; a swing driving device for driving each rotating shaft to rotate is arranged on the rack; according to the structure of the second shaping device, a front side shaping door is installed on the front section of the rack through a first sliding structure, and a rear side shaping door is installed on the rear section of the rack through a second sliding structure. A displacement driving device enabling the front side shaping door and the rear side shaping door to be folded inwards or unfolded outwards is arranged on the machine frame. The equipment can achieve automatic shaping, reduces labor intensity and cost, is high in working efficiency and good in shaping effect, and can adapt to shaping operation of goods and tray sets of various specifications.

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 invention discloses a rotary compressor and a refrigeration cycle device including the same. The rotary compressor includes a housing, a main bearing, a sub-bearing, a cylinder, a roller, a vane, and an injection channel provided in at least one of the main bearing, the sub-bearing, and the cylinder. A respective compression chamber may be in communication with the respective compression chamber after a compression start angle of the respective compression chamber. As a result, it is possible to minimize leakage of the injected refrigerant toward the suction port side while ensuring the maximum injection section.

The invention provides an aero-engine main bearing micro-defect nonlinear phased array ultrasonic nondestructive testing method and device, and relates to the technical field of ultrasonic nondestructive testing, the method comprises the following steps: according to the sound beam focal spot diameter of the emission aperture of a phased array excitation probe, carrying out grid division on a target detection area; according to a focusing rule of a phased array emission aperture, focusing scanning of each grid is completed in sequence, and ultrasonic signals of each grid are collected through a phased array receiving probe in the scanning process; carrying out noise reduction processing on the ultrasonic signal by utilizing a self-adaptive bilateral filtering algorithm; a signal blind source separation algorithm is adopted to decouple the processing signals, nonlinear harmonic signals generated by the microdefects are separated, and positioning and quantitative analysis are conducted on the microdefects; and the two phased array probes scan along the contour of the cross section of the bearing ring to complete the full-coverage detection of each cross section of the bearing ring. According to the invention, the microdefect of the aircraft engine bearing can be subjected to nondestructive detection.

A modular crankshaft configured for use within a power end assembly. The modular crankshaft is configured to interconnect a drive shaft and a plurality of linear drive assemblies. The various embodiments of modular crankshafts disclosed herein are assembled by interconnecting a plurality of individual main bearing journals using a plurality of fasteners. One or more embodiments of modular crankshafts may also include individual connecting rod journals that are attached to individual main bearing journals using a plurality of fasteners.