Fracture analysis of driving gear of engine starting motor
The starting motor drive gear material is 20CrMnTi, and the heat treatment process is normalizing quenching and tempering carburizing quenching […]
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Simulation calculation and result analysis of involute spur gear under low speed condition
1. Simulation method validation In order to verify the simulation model, the minimum oil film thickness is far less than […]
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Wear prediction model of involute spur gear at low speed
1. Basic wear model In the meshing process of gear pair, the relative sliding and rolling occurs between the meshing […]
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Load distribution coefficient model of involute spur gear at low speed
When involute spur gear works, it has to go through the process of single tooth meshing and double tooth meshing […]
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Measurement of tooth profile error of straight involute gear
Based on the generating principle of base circle involute, the tooth profile measurement method of involute gear is proposed ° […]
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Accuracy measurement of involute profile of gears
Around 1920s, people began to discuss the problem of gear accuracy measurement. In 1922, Switzerland applied for the patent of […]
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Vibration mechanism of planetary gearbox
Planetary gearbox is mainly composed of central shaft, planetary gear and sun gear. In the gearbox fault, the probability of […]
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Tooth surface detection formula of hourglass worm gear
Let the circumferential matching angle between the measuring coordinate system and the theoretical coordinate system be φ P. Then the […]
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Detection principle of hourglass worm gear tooth surface
In order to obtain the actual coordinate points of the hourglass worm tooth surface, the coordinate machine or gear measuring […]
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Geometric model of each gear rotor
The figure shows the rotor model of a typical integral 5-stage centrifugal compressor. As shown in figure a), TST, WST, […]
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Determination of fatigue stress dangerous position of pinion
In general, the fatigue failure of gear is to produce microcracks at the position of the maximum stress of gear […]
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Calculation of revolution angle of noncircular gear shaper cutter
When the pitch circle of the gear shaper cutter rolls along the pitch curve of the non-circular gear, it not […]
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Nephogram of contact pressure distribution and contact state of low speed and heavy load gears
Figure 1 is the contact pressure diagram of the gear in the process of meshing, and the pressure distribution of […]
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The condition of noncircular gear design
The diagram of stepless transmission mechanism is shown in Figure 1. The driving noncircular gears 1 and 3 are the […]
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Variation of equivalent stress and time in meshing process of low speed and heavy load gears
The results of the overall equivalent stress of the gear are shown in Figure 1. The variation law of dynamic […]
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Tooth surface construction of pure rolling internal meshing line gear based on cylindrical helix
On the basis of space curve meshing theory, the tooth surface construction of parallel shaft pure rolling internal meshing line […]
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Fatigue fracture analysis of low speed and heavy load gears
The macro morphology of fatigue fracture of low speed and heavy load gear teeth can be divided into three obvious […]
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Failure analysis of forging of a fuel gear pump shell
Macro analysis It can be seen from Fig. 1 (a) that the cracks are exposed on the forging surface, the […]
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Fatigue life prediction of low speed and heavy load gears
Since the test data under each stress level obey the lognormal distribution, when the normal probability density function is known, […]
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Calculation principle of chord tooth thickness and chord tooth height measurement of double circular arc gear
The normal chord tooth thickness is the shortest distance between the two theoretical contact traces (spatial helix) on the left […]
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The formula used to draw the tooth profile and base circle of helical gear end face
The following equation can be obtained from the geometric knowledge of involute gear: Where, α T is the end face […]
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S-N curve and P-S-N curve of low speed and heavy load gear
The number of fatigue cycles under four stress levels is counted in the order from small to large, and the […]
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Calculation of tooth root stress of low speed and heavy load gear
Before calculating the tooth root stress of the gear, it is necessary to find the exact position of the load […]
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Design of low speed and heavy load gear specimen
Before carrying out bending fatigue strength, the primary task is the design and manufacture of gear specimens. Because the object […]
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Bending fatigue test of low speed and heavy load gears
In order to study the problem of fatigue crack propagation and fatigue life of low-speed and heavy-duty gear, a low-speed […]
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Statistical analysis of crack length and fatigue life of low speed and heavy load gears
For the statistical analysis of this section, the relevant data of stress ratio r = 0.6 is also used. The […]
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Effect of lubrication contact on gear pitting load condition
According to the theory of elastohydrodynamic lubrication, the lubricant entering into the crack will form a certain pressure inside the […]
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Statistical analysis of crack length and crack tip stress intensity factor of low speed and heavy load gears
In order to verify the accuracy of the fatigue crack growth test of the compact tensile specimen, the data of […]
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Analysis of stress intensity factor at crack tip of low speed and heavy load gear
The theoretical Mises stress nephogram distribution law of the numerical simulation model of compact tensile specimen under macro state is […]
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Experimental verification of gear residual life
1. Data acquisition In the experiment, the gear fatigue life test-bed as shown in Figure 1 is used to monitor […]
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Establishment of fatigue crack propagation model for low speed and heavy load gears
The model used for numerical simulation of fatigue crack growth is the same as that of 42CrMo steel compact tensile […]
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T-sne dimension reduction analysis of shearer rocker gear fault
In order to more clearly reflect the output classification status of features in each layer of RESNET model, t-sne technology […]
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Fatigue life analysis of low speed and heavy load gears
With the continuous progress of the test, under the action of cyclic load, cracks appear on the sample and continue […]
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Analysis of relationship between crack tip stress intensity factor and propagation rate of low speed and heavy load gear
The fatigue crack growth rate DA / D N and the stress intensity factor at the crack tip under different […]
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Analysis of the relationship between crack length and stress intensity factor at crack tip of low speed and heavy load gea
The data of crack tip stress intensity factor (SIF) and crack length under different stress ratios collected through the test […]
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Test method of fatigue crack propagation for 42CrMo steel low speed and heavy load gear
The fatigue crack growth test of compact tensile specimen was carried out according to the national standard GB / T […]
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Analysis on dynamic load coefficient of meshing force of parallel planetary gears
The maximum meshing force reflects the maximum load of planetary gear. The dynamic load coefficient is the ratio of the […]
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Compact tensile test equipment for 42CrMo steel low speed and heavy load gear
The fatigue crack growth test was carried out in the State Key Laboratory of new metal materials, University of science […]
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Analysis of maximum meshing force of parallel planetary gears
After the detailed grid data is predicted, if the output torque of P20 row is expressed as 1, then the […]
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Compact tensile test material of 42CrMo steel for low speed and heavy load gear
42CrMo steel is a kind of ultra-high strength steel, which has strong resistance to plastic deformation, less possibility of brittle […]
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Local eddy current and worst speed of low speed and heavy load gears
The existence of the worst speed in the boundary lubricated gears has not been discussed in the literature. There is […]
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Dynamic model of planetary gear transmission system with sun gear failure
1. Physical model Take 2K-H Planetary gear transmission system as the analysis object, as shown in Fig. 1 (a). The […]
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Wear law of low speed and heavy load gears
It is known from the test results that for the low-speed and heavy-duty lubricated gears with circumferential velocity v = […]
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Research on wear test method of low speed and heavy load gear
The tests were carried out on the modified CL-100 gear testing machine. The schematic diagram of the testing machine is […]
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Technological requirements for developing deep carburizing heavy duty gears
The carburizing layer of large low-speed and heavy-duty gears is deep, and the surface carbon concentration is low. The carburizing […]
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Transmission structure and noncircular gear design
The transmission ratio of non-circular gear can be changed according to the established motion law. Compared with the connecting rod, […]
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Mechanical performance test of engine starting motor drive gear
1. Hardness layer depth detection The results show that the surface hardness is 56-60hrc, the core hardness is 40-42hrc, and […]
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Carburizing and quenching process of low speed and heavy duty gear
1.Technical Requirements 20grni2moa steel material, module M = 6, number of teeth z = 38, width of teeth H = […]
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Load distribution coefficient model of involute spur gear at low speed
When involute spur gear works, it has to go through the process of single tooth meshing and double tooth meshing […]
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Response characteristics of gear meshing force under fatigue pitting
According to the advanced slicing function of gear modeling along the tooth width direction, the gear is sliced during gear […]
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Response characteristics of time varying meshing stiffness of gears
According to the motion relationship of gearbox transmission system and the advanced parameter modeling method of gear, bearing and other […]
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Characteristic response of fatigue pitting corrosion on tooth surface of gear transmission system
According to the above research on the time-varying meshing stiffness of gears with pitting features, the periodic stiffness curve with […]
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Damping ratio of fatigue non pitting characteristic response of gear transmission system
The displacement response of driving gear xp under different damping ratios (ζ = 0, 0.05, 0.10, 0.15) is plotted in […]
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System parameters of dynamic model of gear transmission
Taking the basic parameters of gear pair 1 as an example, it is difficult to use regular geometric algorithm to […]
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Study on Meshing Stiffness of Random Distribution Pitting of Gear Transmission System
Micro pitting can be regarded as the precursor of the occurrence of early pitting characteristics, and its geometric characteristics are […]
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Research on meshing stiffness of gear transmission system with randomly distributed pitting corrosion
According to the randomness of the pitting formation area, the pitting physical model under the random distribution shown in Figure […]
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Multi pitting corrosion model of gear transmission system along tooth width direction
For as shown in figure 1 (b) along tooth width direction more corrosion characteristics of the model, select the multipoint […]
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Multi-point erosion model of gear transmission system along tooth profile direction
For as shown in figure 1 (a) along the direction of the tooth profile of multipoint corrosion characteristic model, selecting […]
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Multi-point erosion model of gear transmission system
The multi-point erosion model can be mainly divided into the direction along the tooth profile and the direction along the […]
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Calculation and Discussion on meshing stiffness of gear transmission system with single pitting
According to the schematic diagram of pitting section in Figure 1, the section at the node is selected to study […]