Custom Gear Production Example: High Ratio Hypoid Gear

Dividing device using high ratio hypoid gears

This is a high ratio hypoid gear for a dividing device. It can be manufactured with carburized material and ground tooth finishing, achieving both high strength and high precision. To realize a large reduction ratio of 1:30 within a limited product size, it was difficult to design the tooth surface with a pinion having only 2 teeth, which is not typical for hypoid gears. Additionally, due to the high sliding speed of the tooth surfaces, significant heat generation occurs, leading to changes in gear clearance and worsening operating conditions. To reduce heat generation, we determined that the following key items were necessary: 1. Improvement of surface roughness (selection of grinding wheels and optimization of processing conditions during manufacturing) 2. Optimization of tooth shape (increasing transmission error during design). With our long-standing expertise, we implemented surface roughness improvement techniques and tooth surface design, allowing for adjustments in sliding speed through tooth shape correction. As a result, we were able to achieve a very high transmission error, contributing to the production of a very compact gearbox. We successfully provided products that maintain accuracy equivalent to that of worms without any burning of the tooth surfaces.

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