Papers by Keyword: Contact Pattern

Abstract: The article deals with the various methods of testing gearboxes of rail vehicles such as tram, metro, suburban unit EMU (Electric Multiple Unit). Further deals with determination of the load test parameters, the methodology for measuring of monitored magnitude and result evaluation. Some gearboxes have been designed for extreme operating temperatures ± 40°C. In the article are described the main types of tests performed on gearboxes of rail vehicles and their results on specific types of gearboxes. Tests include the following methods: verification of assembly accuracy, sealing test against leak of oil, sealing test against ingress of water (water fog) at runtime of gearbox, sealing test gearbox against ingress of water under pressure at rest, long duration test on-load (runtime test) with variable load spectrum, test in mode "Cold climate test", contact pattern gears (application of modification).

Abstract: A method—characteristic parameters analysis (CPA) is put forward, which is used for quantitative analysis of contact pattern of spiral bevel gears with installation errors. For forming the tooth surface of spiral bevel gears, local synthesis is used. To imitate rolling test machine, the pinion drive torque is calculated under the indentation depth 0.00635mm. Driven by this torque, the size, shape, location and variation of contact pattern are obtained by loaded tooth contact analysis (LTCA). A pair of aviation spiral bevel gears was taken to quantitatively analyze the various contact patterns under different installation errors. The results indicate that the contact pattern is more sensitive to pinion axis installation error.

Abstract: An innovative modeling method of spiral bevel gear is presented in detail for actively controllable contact patterns. Firstly the 3D model gear of is given, and then creates its modified model by analyzing the contact patterns of work condition. Lastly, being based upon meshing theory, the modified gear moves relatively to the pinion blank, and simultaneously carries out Boolean Subtracting on the pinion blank, which is the modeling process of a pinion’s tooth surfaces. With this method, modeling of spiral bevel gears is more convenient to get, and gear contact patterns is easier to control actively.