Abstract
As the main drive components of the automobile transmission, the performance of gear shaft plays an important role on transmission performance. Aiming at the existing problems of the traditional strength check method of gear shaft, the objective of this study is to take a five-speed transmission as an example, to accomplish the strength analysis of gear shaft of the automobile transmission based on the MASTA software. Furthermore, the simulation modeling of the transmission is built completely to simulate the actual load conditions and complete the process of analysis for the gear shaft. Analytical results show that all gear shafts can fully meet the strength requirements, in addition to the input shaft which has any further improvements. Hence, it is indicated that a new design concept is put forward, that is, using specialized software MASTA for transmission modeling and simulation analysis can heavily improve the design level of the gear shaft, provide the theoretic basis to analyze the dynamic characteristics of gear shaft as well. Finally, it can provide references for the development and application of gear shaft of the automobile transmission.
Highlights
Automobile transmission is a kind of control device used to transmit power, adjust the running speed of automobile and switch the automobile forward and backward
In order to provide the theoretical basis for structural design of gear shaft, especially for new structural measures taken for the dangerous position in time, the strength of gear shaft should be clearly understood after the preliminary structural design is completed
By means of the professional transmission system analysis software MASTA, we use its powerful parametric function to establish the standard in volute cylindrical gear shaft parametric model and import them into MASTA simulation module for CAE analysis, simultaneously considering local complex parts, to study the distribution regularity of stress and strain of gear shaft and obtain the static strength and fatigue strength of gear shafts of the automobile transmission, which verify the rationality of the theoretical analysis and calculation
Summary
Automobile transmission is a kind of control device used to transmit power, adjust the running speed of automobile and switch the automobile forward and backward. By means of the professional transmission system analysis software MASTA, we use its powerful parametric function to establish the standard in volute cylindrical gear shaft parametric model and import them into MASTA simulation module for CAE analysis, simultaneously considering local complex parts, to study the distribution regularity of stress and strain of gear shaft and obtain the static strength and fatigue strength of gear shafts of the automobile transmission, which verify the rationality of the theoretical analysis and calculation. Where, Me max = The maximum torque of the engine, N. m A = The center distance of the transmission, mm preliminary sizing of the diameter of gear shaft should consider the structure layout of the transmission, bearings spline and an elastic retainer ring and other factors and should be amended in accordance with the checking results of the strength and stiffness of gear shaft. After the calculation of the vertical counterforce and horizontal counterforce of each pivot point, the corresponding vertical bending moment Mc and horizontal bending moment Ms can be obtained, so the stress σ (MPa) of gear shaft under the combined action of bending moment and torque can be obtained by the following formula:
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