Abstract
A dynamic model of power split transmission system with face gear and cylindrical gear is established. The factors including time-varying mesh stiffness, torsional stiffness, supporting stiffness, and clearance are considered in the model. The influence of the torsional stiffness of compound gear shaft on the load sharing coefficient is analyzed. The results show that the influence of the torsional stiffness of the compound gear shaft is obvious. Because the torsional stiffness of the output gear components is larger and the torsional stiffness of the input gear is smaller, so the input stage's deformation coordination ability is strong. Therefore, with the increase of the torsional stiffness of the compound gear shaft, the load sharing coefficient of the power input stages is improved, but the load sharing coefficient of the split torque stages and power confluence stages is worse. Hence, the torsional stiffness ratio of the transmission shaft should be rationally allocated under the condition that the torsional stiffness of the compound shaft is small.
Highlights
In the transmission system of the helicopter main reducer, compared with the planetary gear configuration, when using the cylindrical gear or face gear split torque transmission system, it can improve the power-to-weight ratio of the helicopter main reducer, and has the advantages of high reliability, weight loss and noise reduction, small error, and simple support structure [1,2,3,4,5].For the power split transmission configuration, the load transmitted by both branches should be equal, or partial load will occur, or even the gear will be broken, which will affect the safety and service life of the drivetrain
In order to improve the load sharing performance of power split transmission, many scholars carry out extensive research on it
Based on the concentrated mass method, a bending and torsion coupling dynamics model is established, and the influence of torsional stiffness of the compound gear shaft on the load sharing coefficient is studied emphatically, which provides a reference for improving the load sharing performance of the transmission system
Summary
In the transmission system of the helicopter main reducer, compared with the planetary gear configuration, when using the cylindrical gear or face gear split torque transmission system, it can improve the power-to-weight ratio of the helicopter main reducer, and has the advantages of high reliability, weight loss and noise reduction, small error, and simple support structure [1,2,3,4,5]. The load sharing performance is one of the important indicators of power split transmission configuration. In order to improve the load sharing performance of power split transmission, many scholars carry out extensive research on it. The clocking angle can be adjusted to split a design load between two power paths. Some scholars have studied the influence of the flexible shaft on the dynamic load sharing properties [10,11,12,13]. Based on the concentrated mass method, a bending and torsion coupling dynamics model is established, and the influence of torsional stiffness of the compound gear shaft on the load sharing coefficient is studied emphatically, which provides a reference for improving the load sharing performance of the transmission system
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