The spiral bevel gear of heavy vehicles generally adopts high-strength alloy steel such as 30CrMnTi. This kind of steel is a special material. The problem of large deformation cannot be solved by using the common heat treatment process. In order to ensure the grinding accuracy, the grinding allowance is...
Heavy duty spiral bevel gear has many excellent characteristics, such as stable transmission performance, low noise, large transmission torque and so on. Therefore, it is widely used in the transmission system of heavy vehicles. At the same time, it meets the requirements of light weight, high bearing capacity, low...
Taking the transmission gear of heavy equipment as the research object, the fatigue crack propagation and fatigue fracture of gear teeth are studied. The compact tensile specimen made of 42CrMo steel was tested for fatigue crack growth and numerically simulated to verify the feasibility of the test; Then, the...
The model used for the numerical simulation of gear bending fatigue is the same as that used in the bending fatigue test of 42CrMo steel heavy equipment transmission gear. Therefore, the analysis model is created according to the design parameters of heavy-duty gear in the finite element software ABAQUS,...
When testing the bending fatigue of 42CrMo heavy equipment transmission gear by experimental method, the data results have obvious advantages, such as: the data results are true, reliable and authoritative. Referring to the national standard GB / t14230-1993, the test data obtained can most truly and directly reflect the...
Before the formal bending fatigue test, the load level of the test needs to be determined. Pick two from the processed test pieces for static strength test. According to the static strength test, the maximum load level is 32KN. Five load levels are selected for this bending fatigue test,...
The bending fatigue characteristic curve and bending fatigue limit stress of the test gear shall be combined according to different test points according to different test purposes. When using the group method to calculate the Reliability stress life curve (P-S-N curve) of the gear, the test results should include...
The transmission gear of heavy equipment used in the bending fatigue test is designed based on the gear applied in the actual factory. The success of gear design and manufacturing is related to the success or failure of the whole bending fatigue test. A successfully designed gear needs to...
The test adopts the form of single tooth loading. It is necessary to design special fixtures according to the standard requirements to carry out tooth fatigue test. When designing the fixture, the following requirements shall be met: 1) The fixture must have enough stiffness to ensure the correctness of...
The stress ratio r = 0.6, the number of cycles n corresponding to the stress intensity factor at the crack tip under different crack lengths and different crack lengths obtained by simulation, and the number of cycles n obtained from the test and the calculated n are drawn into...