Worm Tooth Bottom Geometry for Rotational Balance
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Solution Overview
Problem
Existing worm manufacturing processes are complicated due to the need to adjust multiple parameters such as lead angle and chamfer angle, which increases manufacturing complexity.
Innovation Solution
A worm design with a main body part, first and second tapered parts, and spiral teeth, where the position of the second tooth bottom end part is configured within a specific angle range relative to the first, simplifying the manufacturing process while achieving good rotational balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple adjustment elements (lead angle and chamfer angle) are determined for a specific worm length, then rotational balance can be improved, but manufacturing process complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the worm by introducing tapered parts at both ends with specific taper angles (α1 and α2). This parameter modification allows the worm to achieve good rotational balance without requiring complex adjustments of lead angle and chamfer angle, thus resolving the contradiction between rotational balance and manufacturing complexity
Solution Approach 2:
The patent applies asymmetry by creating non-uniform tapered parts at the two ends of the worm. The first tapered part has a different taper angle (α1) from the second tapered part (α2), and their lengths (L1 and L2) can also differ. This asymmetric design optimizes rotational balance while maintaining manufacturing simplicity
2Stability of the object's composition
If the tooth bottom part extends in a spiral shape with specific angular positioning, then rotational balance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines a specific angular relationship between the first and second tooth bottom end parts, where the position of the second tooth bottom end part falls within an angle range of less than 90 degrees relative to the first tooth bottom end part. This parameter specification achieves good rotational balance while providing a clear manufacturing target that does not require excessive precision
Data Source
AI summary
In a worm, a cutting start part forming one end part of a tooth bottom part is provided at a first tapered part. A cutting end part forming another end part of the tooth bottom part is provided at a second tapered part. The tooth bottom part extends to advance in a spiral shape from the cutting start part toward one circumferential side (counterclockwise direction) of the worm. A position of the cutting end part is configured within an angle range (at a position of 38 degrees) of less than 90 degrees on another circumferential side (clockwise direction) of the worm with respect to a position of the cutting start part, centered on a rotation center (equal to a rotation center of a rotating shaft) of the worm.