Mesh efficiency analysis of conical involute gears

Abstract

The conical involute gears have been applied to automotive parts such as FR-4WD transfer. To apply for automobile, high capacity, higher quietness and efficiency are required. However the tooth contact of conical gear pair is point contact, so the large ease off happens even though each tooth surface has no manufacture error. Also the tooth depth and thickness of conical involute gears change along the lead direction. These characteristics have to be considered for the tooth mesh analysis. We have already published the transmission error analysis and tooth surface durability analysis considering these peculiar characteristics. In this paper, we develop the mesh efficiency analysis and show the improvement method of mesh efficiency by tooth surface modification. From this investigation, it is found that the mesh efficiency of conical involute gears is better than same size cylindrical gears due to the peculiar ease off distribution.

Keywords

• conical involute gear
• relative tooth surface
• ease off
• tooth contact
• coefficient of friction
• mesh efficiency