Study on TEHL flash temperature of helical gear pair considering profile modification

Abstract

Purpose The purpose of this paper is to investigate the thermal elastohydrodynamic lubrication (TEHL) flash temperature of the helical gear pairs considering profile modification. Design/methodology/approach A flash temperature model of the helical gear pair considering the profile modification is proposed based on the TEHL and meshing theories. In doing so, the slicing, fast Fourier transform and chase-after methods are applied to accurately and rapidly obtain the flash temperature of the gear pair. Then, the effects of the modification, input torque and rotation speed on the flash temperature are studied. Findings With the increment of the tip relief amount, the flash temperature of the helical gear pair with the axial modification decreases first and then increases, and the meshing position of the maximum flash temperature moves toward the pitch point. Moreover, reducing the input torque or increasing the rotation speed can efficiently reduce the TEHL flash temperature. Originality/value This work is a valuable reference for the profile design and optimization of the helical gears to avoid the excessive flash temperature.

Study on the flash temperature phenomenon in the contact area of rolling bearings

“…Theoretical advances have been made in the investigation of flash temperature. Liu looked into the helical gear pairs’ thermal elastohydrodynamic lubrication (TEHL) flash temperature when taking profile modification into consideration (Liu and Gong, 2023); Borut established an improved flash temperature model for polymer gear pairs and studied the flash temperature on the gear contact surface (Borut et al , 2019). Using finite element software, Fernandes studied the flash point temperature of polymer gears and came up with a method for examining the flash temperature on the tooth surface (Fernandes et al , 2018).…”