677 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 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.

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 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 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 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 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.

A compressor (100) includes a housing (104), a scroll assembly (120), and a drive shaft (132). The scroll assembly includes an orbiting scroll (122) including an orbiting spiral wrap (162) and a second opening (164), the second opening (164) including a drive bearing (166) disposed in the second opening (164). And the driving bearing is axially aligned with the movable spiral scroll. The compressor includes an unloader (200) rotatably connected to the drive shaft body (134) and rotatably supported by the main bearing (150).

The three-phase cycloidal planetary reducer comprises eccentric shaft assemblies, cycloidal gears, a planet carrier and a pin wheel housing, the eccentric shaft assemblies are arranged in the circumferential direction of the planet carrier at intervals of 120 degrees, and each eccentric shaft assembly comprises an eccentric shaft, a falling-off type needle bearing and a second needle bearing. The eccentric shaft is provided with three sections of eccentric parts with the same eccentricity, the eccentric directions of the eccentric parts are distributed at intervals of 120 degrees, the eccentric part located in the middle is provided with a falling-off type needle bearing, and the eccentric parts located on the two sides are provided with second needle bearings; one end of the eccentric shaft is connected with a planetary gear through a spline; the eccentric shaft is connected with the planet carrier through a bearing; the cycloidal gear is in transmission connection with the eccentric shaft through a falling-off needle bearing or a second needle bearing at the corresponding position; the planet carrier is connected with the pin wheel housing through a main bearing; a roller pin is installed on the inner side of the pin wheel housing, and the cycloidal gear is meshed with the roller pin. The transmission mechanism has the advantages of being good in integrity, small in transmission error and convenient to assemble.

The invention discloses an engine main bearing resonance parameter determination method and device, equipment and a medium, and relates to the technical field of mechanical state monitoring, and the method comprises the steps: obtaining a current working condition parameter of a target engine, and detecting whether the current working condition parameter meets a state threshold condition in a corresponding cruise state or not; if yes, acquiring corresponding equipment characteristic parameters, acquisition configuration parameters and original vibration data, determining fault characteristic frequency of each element of the main bearing of the target engine, acquiring harmonic amplitude of each order corresponding to the fault characteristic frequency, and constructing a target function; performing global optimization on the target function by using a preset swarm intelligence optimization algorithm according to the target constraint condition to obtain a first resonance parameter; when it is monitored that the impact signal performance index extracted based on the first resonance parameter is lower than a preset threshold value, the first resonance parameter serves as a search starting point, local optimization is conducted on the target function, and a second resonance parameter is output. And the most suitable resonance parameter is automatically selected in the actual operation process.

The invention belongs to the technical field of metal preparation, and particularly relates to a heat-treatment-free high-toughness Al-Si-Mg alloy and a preparation method. The alloy comprises the following components in percentage by mass: 7 to 8 weight percent of Si, 0.5 to 1.0 weight percent of Mg, 0.3 to 0.8 weight percent of Cu, 0.2 to 0.6 weight percent of Mn, 0.1 to 0.5 weight percent of Zn, 0.1 to 0.3 weight percent of Mo, 0.1 to 0.25 weight percent of Zr, 0.1 to 0.18 weight percent of La, 0.05 to 0.1 weight percent of V, 0.03 to 0.05 weight percent of B and the balance of Al and inevitable impurities, and the total weight percent is 100 percent. According to the invention, Al-Si-Mg is taken as a matrix, and mechanical properties and strong plasticity are improved by adding various alloy elements to cooperate with microalloying, so that the Al-Si-Mg alloy can be widely applied as a main bearing structural member.

The invention relates to the technical field of industrial data processing, and particularly discloses a fault prediction method for automobile motor production equipment based on machine learning, which comprises the following steps: synchronously acquiring vibration data of a main bearing and working condition data of a main shaft motor, and calculating a learning admission factor based on a deviation degree between the working condition data and a preset standard working condition; performing weighted gating on the basic drift learning rate of the dynamic baseline model by using the learning admission factor, and further updating a baseline mean value and a slow variation fluctuation rate; and calculating an instantaneous fluctuation ratio based on the instantaneous energy deviation of the vibration data and the updated baseline mean value, determining the ratio of the instantaneous fluctuation ratio to the slow fluctuation ratio as a working condition sudden change index, identifying the current working condition type and obtaining a corresponding adaptive threshold value, and when the working condition sudden change index exceeds the adaptive threshold value, judging that a fault is generated. According to the method, immunity to transient working conditions and sensitive detection to weak mutation in a steady state can be realized at the same time, and the accuracy and robustness of fault prediction are greatly improved.

The invention discloses a sliding bearing structure of a wind power partitioned elastic trapezoidal main shaft. Comprising a segmented sliding bearing design, and trapezoidal cross-section staggered structures are symmetrically arranged between contact surfaces of a bearing unit and a main shaft. Aiming at the problems of weak self-aligning capability, concentrated contact stress and the like caused by insufficient elastic compensation of a wind power main bearing under high load, optimization is realized through the following innovations: a trapezoidal structure is additionally arranged on the contact surface of a block bearing, and the overall radial compliance of the bearing is enhanced by utilizing the elastic deformation characteristic of a trapezoidal cross section staggered structure; the elastic units are distributed in a gradient mode in the circumferential direction, a self-adaptive oil film pressure field is formed by combining the elastic units with the stepped lubricating flow channels, and the unbalance loading compensation capacity and the dynamic pressure lubricating efficiency of the spindle are synchronously improved. The gaps promote heat dissipation circulation and discharge of abrasion chippings, and local abrasion is avoided. By means of the structure, when the main shaft is strongly bent or moves, displacement deviation is absorbed through deformation of the elastic units, the self-aligning angle is increased, the contact stress peak value of the edges of the partitioning units is reduced, and the eccentric wear risk is reduced.

The invention belongs to the field of failure analysis of bearings, and discloses a fatigue life analysis method of a wind power main bearing based on thermal-mechanical coupling. In order to consider the influence of pre-tightening on the service life of the bearing, the method takes the pre-tightening force of the bearing as a starting point, and gradually establishes a relational expression between pre-tightening and a series of static characteristics such as contact deformation, contact load, fatigue life and the like by utilizing an analytical method; meanwhile, the friction torque is introduced, the finite element analysis method is used for solving the influence of thermal deformation on the static characteristics of the bearing, the influence is substituted into the static characteristic relational expression, and finally the service life analysis method of the bearing based on thermal-mechanical coupling is achieved. Compared with the conventional service life analysis method, the fatigue service life analysis method disclosed by the invention has the advantages that the thermal deformation of the bearing caused by friction is additionally considered, so that the analysis is more comprehensive, and the precision of the service life analysis of the bearing is further improved.

The invention provides an aero-engine main bearing axial displacement measuring device and method, and belongs to the technical field of aero-engines, the aero-engine main bearing axial displacement measuring device comprises a bottom plate, a supporting seat, a dial indicator measuring tool, a bearing initial displacement measuring assembly and an axial loading displacement measuring assembly, the supporting seat comprises a first part and a second part, the first part is vertically connected with the bottom plate, and the second part is vertically connected with the dial indicator measuring tool; the main bearing is sleeved on the second part, the periphery of the second part is provided with a guide surface matched with the inner ring of the main bearing, the joint of the first part and the second part is provided with a step surface, the step surface forms a limiting end surface of the inner ring end surface of the main bearing with a dismounting groove, and the dial indicator measuring head abuts against the outer ring of the main bearing; when the free-state displacement activity amount is measured, the bearing initial displacement measurement assembly is fixed on the main bearing and the supporting seat; when the axial loading displacement is measured, the axial loading displacement measuring assembly is fixed on the supporting seat, and axial force is applied to the outer ring of the main bearing. According to the invention, effectiveness and high precision of bearing displacement measurement are realized and improved.

The invention relates to an active gravity compensation spacecraft cabin separation test system and method. The test system is mainly composed of a tension control system, a comprehensive control system, a high-speed measurement subsystem, a system support subsystem and other subsystems. The tension control system and the comprehensive control system are closed-loop control systems taking a high-precision and fast-response torque motor as a core; the high-speed measurement system is used for acquiring parameters such as the inter-cabin separation speed and the angular speed, and performing whole-course monitoring on the state of an inter-cabin separation surface; the system support is a main bearing structure of the tension control system and the separation cabin section, provides a separation simulation space for a spacecraft, and provides an operation platform for ground workers at the same time. By adopting the test system disclosed by the invention, the vertical separation of the large spacecraft during ground development can be realized, the gravity unloading efficiency is as high as 95-105%, and effective separation parameters are obtained.

The invention provides a compressor and refrigeration equipment. The compressor comprises a crankshaft and a main bearing, a long shaft of the crankshaft is sleeved with the main bearing, the long shaft comprises a first part and a second part, a first groove is formed in the circumferential partial structure of the outer wall of the first part, and the first groove and the end, away from an eccentric part, of the main bearing are oppositely arranged; the first groove at least comprises a first inclined surface, and the included angle between the first inclined surface and the axis of the long shaft is 0.5-2 degrees; a second groove is formed in the circumferential partial structure of the outer wall of the second part; the second groove is opposite to one end, close to the eccentric part, of the main bearing; the second groove at least comprises a second inclined face, and the included angle between the second inclined face and the axis of the long shaft ranges from 0.5 degree to 2 degrees. The grooves with the inclined surfaces can increase the contact area between the crankshaft and the main bearing when the crankshaft runs obliquely, so that the load borne by an oil film between the crankshaft and the main bearing can be reduced, the oil film is more stable and complete, and good lubrication and protection effects are continuously formed between the crankshaft and the main shaft.

This application relates to a scroll compressor, an air conditioner, and a control method. The scroll compressor includes a housing and a bearing assembly, a compressor oil sump, an oil pump, and a main bearing oil reservoir disposed within the housing. The housing has an air inlet for installing an air inlet pipe. The scroll compressor also includes a cooling tank located outside the housing. The cooling tank contains an oil passage and an airflow channel, which are isolated from each other. The oil passage is connected to the main bearing oil reservoir and the compressor oil sump, respectively. The air inlet pipe includes a first air outlet and a second air outlet. The first air outlet is connected to the air inlet, and the airflow channel is connected to the second air outlet and the suction chamber of the bearing assembly. According to the scroll compressor of this invention, self-cooling of the lubricating oil can be achieved with relatively low energy consumption, greatly ensuring the lubricating oil's load-bearing capacity and the motor's cooling capacity, thus guaranteeing the motor's load capacity.

The invention relates to the technical field of structure detection and analysis, in particular to a wind turbine generator blade damage type analysis method and system. The method comprises the following steps: acquiring blade surface crack detection image data and a blade three-dimensional structure model, mapping the blade surface crack detection image data into a crack space coordinate point set by utilizing space projection matrix transformation, and establishing a crack structure attribution node; establishing a structural load distribution model, calculating a stress transfer weight coefficient of a bearing path to which the affiliation node of the crack structure belongs, and generating a bearing path weight distribution table according to a node connection relationship of the bearing path; correspondingly matching the crack space position distribution set with the bearing path weight distribution table to form a crack risk analysis matrix; and the crack type of each crack is judged, and a main bearing path crack type and a non-main bearing path crack type are obtained through classification. According to the invention, crack risk quantification and damage type determination are realized, and the corresponding relation between the appearance crack and the internal bearing risk is established.

The present invention discloses a diesel engine crankcase active safety monitoring system and method, the diesel engine crankcase active safety monitoring system comprising: a blowby monitoring module, which is used to monitor the blowby gas flow rate of the engine crankcase; an oil and gas monitoring module, which is used to monitor the oil mist concentration of the engine crankcase; an engine-side monitoring box, which is used to collect the blowby gas flow rate, the oil mist concentration, the engine speed and the engine torque, and send them; a cloud server, which is used to determine the degree of wear of the engine piston ring and the main bearing according to the blowby gas flow rate, the oil mist concentration, the engine speed and the engine torque sent by the engine-side monitoring box through a trained transfer learning model, thereby realizing accurate monitoring of the engine crankcase blowby condition, and accurately identifying the degree of wear of the engine piston ring and the main bearing through the transfer learning model, thereby realizing real-time monitoring of the healthy online status of the engine.

[Problem] To reduce the size and weight of a main bearing for supporting a drive shaft that drives a compression mechanism. [Solution] An electric compressor (10) comprises a drive shaft (61) that drives a compression mechanism (70), a motor (60) that drives the drive shaft (61), a motor housing (20) that defines a motor chamber (21) into which a refrigerant sucked from an external refrigeration cycle is introduced, a compression mechanism housing (30) having a discharge chamber (32) from which the compressed refrigerant is discharged, and a pressure equalization means (120). The drive shaft (61) has a first end surface (61c) disposed in the motor housing (20), a second end surface (61d) disposed in the compression mechanism housing (30), and a portion (61a) supported by a rolling bearing (111) between the motor (60) and the compression mechanism (70). The pressure equalization means (120) equalizes the pressure acting on the first end surface (61c) and the second end surface (61d).

The utility model belongs to the technical field of CT machine main bearing damping, and particularly relates to a high-speed CT machine main bearing damping device which comprises a limiting block. Connecting blocks are fixedly connected between the multiple limiting blocks. Inner rings of double-row angle bearings are fixedly connected to the side walls of the multiple connecting blocks. A connecting rod is slidably connected into the limiting block. The ends of the two connecting rods are fixedly connected with fixing blocks, and the other ends of the two connecting rods are fixedly connected with centrifugal blocks. A fixed convex block is fixedly connected to the side wall of the centrifugal block; clamping wheels are fixedly connected between the corresponding fixing protruding blocks, and the multiple clamping wheels are arranged corresponding to the size of the double-row angle bearing. According to the utility model, the plurality of clamping wheels are arranged to extrude the inner ring of the double-row angle bearing which rotates at a high speed, so that the inner ring and the outer ring of the double-row angle bearing are tightly attached, the vibration condition caused by a raceway structure error and a ball size error is further reduced, the negative influence of bearing vibration on CT imaging is favorably relieved, and the imaging quality of a CT machine is improved.

The present application discloses a method, device, equipment, and storage medium for determining an oil pressure relief point, belonging to the field of engine technology. The method comprises: sampling the oil flow rate of a main bearing oil passage to be detected at a preset oil temperature; determining a relief value of the oil pressure corresponding to the sampled oil flow rate relative to the oil pressure corresponding to a reference oil flow rate based on a predetermined correspondence between the oil pressure and the oil flow rate of the main bearing oil passage; and determining whether a pressure relief has occurred in the main bearing oil passage based on the relief value of the oil pressure in the main bearing oil passage. In this way, it is possible to accurately determine whether the oil pressure relief point is the main bearing oil passage, thereby resolving the complexity and ineffectiveness of disassembling and inspecting internal engine components and improving the efficiency of maintenance work.

The invention relates to a crankshaft for an internal combustion engine. In particular, the invention relates to a crankshaft having at least one crankshaft segment, comprising at least one disk-shaped crank web, arranged with rotation symmetry relative to a crankshaft axis and carrying a main bearing surface that rotates around a crankshaft axis, and a crank pin that is arranged eccentric to the crankshaft axis and extends parallel to the crankshaft axis.

The invention discloses a machining tool and method suitable for a large-diameter main bearing hole of a diesel engine base, solves the problems that in the prior art, the number of machining tool bits is large, errors are prone to being caused during installation, and hole walls are prone to being scratched, and has the beneficial effects that the machining efficiency and the machining quality are improved. According to the specific scheme, the machining tool suitable for the large-diameter main bearing hole of the diesel engine base comprises a rough boring tool and a fine boring tool, the rough boring tool comprises a first tool handle, the first tool handle is connected with a first tool rest, the first tool rest is cross-shaped, and a first turning tool is arranged at each end of the first tool rest; the length of each first turning tool exceeding the first tool rest is gradually increased; the fine boring cutter comprises a second cutter handle, the second cutter handle is connected with a second cutter frame, the second cutter frame is a double-turning-tool cutter frame, cutter clamping block bodies are arranged on the two sides of the second cutter frame respectively, the cutter clamping block bodies can be folded relative to the second cutter frame, and the cutter clamping block bodies on the two sides of the second cutter frame are detachably connected with a second turning tool and a third turning tool respectively.