Resin Helical Gear 3D Tooth Surface Modification
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Solution Overview
Problem
Conventional techniques for modifying the tooth surface of resin helical gears, such as crowning and bias-out/bias-in modifications, fail to sufficiently reduce rotation transmission errors caused by misalignment between gear shafts.
Innovation Solution
A resin helical gear with a three-dimensional tooth-surface modification is implemented, where first and second machining reference lines are set to create smooth curved surfaces that maintain the involute tooth profile form, reducing the rotation transmission error by optimizing tooth surface contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional crowning or bias-out/bias-in tooth-surface modification is performed on resin helical gear, then the tooth contact is concentrated on center of tooth width, but the rotation transmission error caused by misalignment between gear shafts is not sufficiently reduced
Solution Approach 1:
The patent transitions from conventional two-dimensional tooth-surface modification (crowning or bias-out/bias-in) to three-dimensional tooth-surface modification. The modification amount varies in three dimensions across the tooth surface, with different modification patterns applied to different regions (tooth tip side, center side, root side) to comprehensively reduce rotation transmission errors caused by misalignment in multiple directions.
Solution Approach 2:
The patent applies different three-dimensional tooth-surface modification patterns to different local regions of the tooth surface. Specifically, the tooth tip side, center side, and root side each receive customized modification amounts and patterns tailored to their specific operational characteristics and error sources, rather than applying a uniform modification across the entire tooth surface.
2Reliability
If three-dimensional tooth-surface modification is performed to reduce rotation transmission error, then transmission accuracy improves, but the complexity of machining and manufacturing increases
Solution Approach 1:
The patent divides the tooth surface into multiple distinct regions (tooth tip side, center side, root side) and applies separate modification patterns to each region. This segmentation allows for independent optimization of each zone while simplifying the overall machining process by treating different regions separately rather than requiring complex full-surface modification.
Solution Approach 2:
The patent systematically varies the modification amount parameter across different regions of the tooth surface. By defining specific modification amounts for the tooth tip side, center side, and root side, the invention transforms a complex three-dimensional modification problem into a series of controlled parameter adjustments that can be implemented with standard machining equipment.
Data Source
AI summary
A resin helical gear is formed by setting a first machining reference line obliquely coupling a tooth tip side of a first tooth to a tooth root side of a second tooth on another end side in the tooth width direction along a tooth surface, and a second machining reference line obliquely coupling a tooth tip side of the second tooth to a tooth root side of the first tooth along the tooth surface. Then, the tooth surface is cut out from the first machining reference line to the tooth root of the first tooth while the tooth surface is cut out from the second machining reference line to the tooth root of the second tooth. Then, an involute tooth profile form is left on a tooth tip side of the tooth with respect to the first machining reference line and the second machining reference line.