The normal chord tooth thickness is the shortest distance between the two theoretical contact traces (spatial helix) on the left […]
The following equation can be obtained from the geometric knowledge of involute gear: Where, α T is the end face
Robert Basan proposed the mathematical model of slip line contact and the calculation model of multiaxial fatigue life based on
The number of fatigue cycles under four stress levels is counted in the order from small to large, and the
Although the strength of mechanical gear bearing capacity does not entirely depend on gear hardness, improving gear hardness is still
Gear transmission is one of the most commonly used transmission in all kinds of machinery, which has the advantages of
Before calculating the tooth root stress of the gear, it is necessary to find the exact position of the load
Because the mechanical operation is mostly heavy load, medium and low speed transmission, most of them start frequently and often
Before carrying out bending fatigue strength, the primary task is the design and manufacture of gear specimens. Because the object
Comparison of machinability and forgeability between Ni Cr and Ni Cr Mo steels The machinability of different materials is mainly
In order to study the problem of fatigue crack propagation and fatigue life of low-speed and heavy-duty gear, a low-speed
For the statistical analysis of this section, the relevant data of stress ratio r = 0.6 is also used. The
According to the theory of elastohydrodynamic lubrication, the lubricant entering into the crack will form a certain pressure inside the
Other countries in the world mainly use Cr Ni and Cr Ni Mo carbon steel. Compared with Mn Cr steel
In order to verify the accuracy of the fatigue crack growth test of the compact tensile specimen, the data of
In order to verify the correctness of the numerical model, Hertz pressure distribution is applied on the contact model, and
Gear is a kind of mechanical element with continuous meshing transmission of motion and power on the rim, which plays
The theoretical Mises stress nephogram distribution law of the numerical simulation model of compact tensile specimen under macro state is
1. Data acquisition In the experiment, the gear fatigue life test-bed as shown in Figure 1 is used to monitor
Although the deep carburizing of large heavy duty gears improves the bearing capacity and prolongs the service life, it still
Tooth wear is one of the main failure forms of low speed and heavy load gear transmission. H. Winter has
The model used for numerical simulation of fatigue crack growth is the same as that of 42CrMo steel compact tensile
The important parameters to ensure the load-bearing capacity of low-speed and heavy-duty hard face gear are: enough central strength and
In order to more clearly reflect the output classification status of features in each layer of RESNET model, t-sne technology
With the continuous progress of the test, under the action of cyclic load, cracks appear on the sample and continue
The deep carburizing of large heavy duty gears has a history of more than 10 years in foreign countries, with
1. Selection of residual unit module In RESNET, there are two kinds of residual unit modules: original residual unit module
The fatigue crack growth rate DA / D N and the stress intensity factor at the crack tip under different
It is very important to choose the hardening heat treatment method of low speed and heavy load gear reasonably. The
The data of crack tip stress intensity factor (SIF) and crack length under different stress ratios collected through the test
The main damage form of gear in soft tooth surface rolling mill is severe plastic deformation of gear surface, which
Using normalizing big gear and quenching and tempering small gear, the tooth surface after use can be extruded into mirror
The fatigue crack growth test of compact tensile specimen was carried out according to the national standard GB / T
The maximum meshing force reflects the maximum load of planetary gear. The dynamic load coefficient is the ratio of the
As the cement mill, mine hoist and other soft tooth surface reducer gear, the main problem is to eliminate early
The fatigue crack growth test was carried out in the State Key Laboratory of new metal materials, University of science
After the detailed grid data is predicted, if the output torque of P20 row is expressed as 1, then the
When gears work, they bear two kinds of stress, so there are few two kinds of failure. One is that
42CrMo steel is a kind of ultra-high strength steel, which has strong resistance to plastic deformation, less possibility of brittle
The modeling of Pro / E software is based on the characteristics of 3D model, and it can also carry
There are three ways to improve the bearing capacity of gears, namely, ① improving the structure of reducer, such as
The existence of the worst speed in the boundary lubricated gears has not been discussed in the literature. There is
1. Physical model Take 2K-H Planetary gear transmission system as the analysis object, as shown in Fig. 1 (a). The
From the engineering point of view, through the establishment of mathematical models and contact fatigue test platform under different physical
It is known from the test results that for the low-speed and heavy-duty lubricated gears with circumferential velocity v =
By establishing a simplified six degree of freedom dynamic mathematical model of gear system and a rigid body dynamic analysis
The tests were carried out on the modified CL-100 gear testing machine. The schematic diagram of the testing machine is
According to the calculated stress intensity factors, the results of stress intensity factor analysis show that ki is the largest,
Due to the bad working environment of a tank planetary gearbox, the gear is prone to crack and other faults.
The shape of pitting pits on tooth surface is simulated quickly and approximately by using rectangular geometry. The mathematical models
The carburizing layer of large low-speed and heavy-duty gears is deep, and the surface carbon concentration is low. The carburizing
The transmission ratio of non-circular gear can be changed according to the established motion law. Compared with the connecting rod,
1. Hardness layer depth detection The results show that the surface hardness is 56-60hrc, the core hardness is 40-42hrc, and
Considering the macro interface friction coefficient, the load component equation along the tooth profile direction is derived, and the mathematical
1.Technical Requirements 20grni2moa steel material, module M = 6, number of teeth z = 38, width of teeth H =
“Innovation, coordination, green, open and sharing” are the five core supporting development concepts to promote the green transformation of traditional
When involute spur gear works, it has to go through the process of single tooth meshing and double tooth meshing
According to the advanced slicing function of gear modeling along the tooth width direction, the gear is sliced during gear
According to the motion relationship of gearbox transmission system and the advanced parameter modeling method of gear, bearing and other
In order to better reflect the effect of the test gear on the dynamic response characteristics of the system due
