Fundamental study on estimation of tooth contact area based on combined image from temperature monitor images of tooth surface with a high-speed-camera thermography and on meshing vibration for high reduction ratio hypoid gear with a three-tooth pinion

Abstract

In the present report, we focused on high reduction ratio hypoid gear with a three-tooth pinion and its meshing performance. First, we monitored the tooth surface temperature in meshing teeth, based on combined image from temperature images with a high-speed-camera thermography, and compared it with tooth contact image with a red paint. Moreover, we proposed a predicting method of tooth contact area from a combined temperature image on the tooth surface. Second, we estimated its real contact ratio based on measuring the tooth root stresses at the toe, middle and heel positions. Third, we measured the meshing transmission error (MTE) between the gear and the pinion, and the rotational acceleration at the gear outer in meshing teeth. As a result, it could be seen that the real contact ratio affected tooth surface temperature and MTE. Regarding a high reduction ratio hypoid gear, the deformation at the gear rim also affected the dynamic vibration in meshing gear and pinion teeth.

Keywords

• high-reduction ratio hypoid gear
• infrared thermography
• tooth contact area
• tooth surface temperature
• meshing transmission error