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Aimed at washer in planetary transmission, the wear problem of thrust washer and planet gear due to the force in axis direction was investigated. In order to reduce wear, hydrodynamic lubrication design was studied by way of machining rectangular groove in radial direction into one side of thrust washer. The purpose of hydrodynamic lubrication design is that the relative movement between planet gear...
Based on elastic hydrodynamic lubrication (EHL or EHD) theory, an EHL model of the internal meshing between ring gear and planet gear in Planetary Gear Transmission was established. The EHL oil film thicknesses and those distributions for two operation cases on meshing line were calculated: one case with the sun gear as the driving gear and another case with the ring gear as the driving gear. The...
This paper presents a modified numerical model for Elastohydrodynamic lubrication (EHL) calculations of involute spur gears. This model considers the fluid as a Newtonian fluid. The main study performs on gear EHL properties along path of contact (POC). Using this study, the minimum film thickness and maximum pressure value as well complete film geometry and pressure distribution could be obtained...
The planetary gear assembly is a key sub-mechanical set of the Power Shift-Steering Transmission Device (PSSTD). With the help of vibration measurement, the diagnosis issue of the needle bearing failure in the planetary gear assembly is solved. For what, there are collision pulses appearing when the Elastohydro Dynamic Lubrication (EHDL) oil film break in the needle bearing, which can be monitored...
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