Variable-Pitch Worm Gear CVT With Adjustable Meshing Ratio
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Solution Overview
Problem
Conventional worm speed reduction mechanisms have a fixed speed reduction ratio and require expensive inverters to change the ratio, leading to high costs.
Innovation Solution
A continuously variable transmission mechanism with adjustable meshing positions and spiral pitch changes in the worm and wheel gear bodies, allowing for mechanical speed adjustment without inverters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional worm speed reduction mechanism with fixed spiral pitch is used, then the structure is simple and manufacturing is easy, but the speed reduction ratio cannot be changed and requires expensive inverters
Solution Approach 1:
The worm gear body is designed with non-uniform spiral pitch distribution, where different sections of the worm gear have different spiral pitches. This allows the wheel gear to mesh at different positions along the worm gear length, achieving variable speed reduction ratios. The local variation in spiral pitch enables adaptability without requiring complex external control devices.
Solution Approach 2:
The invention makes the meshing position between the worm gear and wheel gear adjustable, transforming a static fixed-ratio mechanism into a dynamic variable-ratio mechanism. By allowing the wheel gear to change its meshing position along the worm gear body, the speed reduction ratio can be continuously adjusted, providing dynamic adaptability.
2Adaptability or versatility
If an inverter is added to change the speed reduction ratio, then the speed ratio can be adjusted, but the cost increases significantly
Solution Approach 1:
The worm speed reduction mechanism achieves speed ratio adjustment through its own structural design - the non-uniform spiral pitch distribution in the worm gear body inherently provides variable transmission ratios. The mechanism serves its own speed adjustment function through its geometry, eliminating the need for external inverters or control devices, thereby reducing manufacturing cost.
Solution Approach 2:
The invention replaces expensive electronic inverters with a simple mechanical structure based on non-uniform spiral pitch. This mechanical solution is more cost-effective and reliable, using basic gear meshing principles rather than complex electronic control systems.
3Adaptability or versatility
If the spiral pitch is made variable along the worm gear body, then continuous variable transmission is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention changes the spiral pitch parameter along the length of the worm gear body, creating a gradient distribution rather than a uniform pitch. This parameter variation enables continuous variable transmission ratios. The manufacturing process incorporates this controlled parameter change through specialized gear cutting or forming techniques that can produce non-uniform pitch distributions.
Data Source
AI summary
A continuously variable transmission mechanism includes: a worm gear body on an input side that is formed such that a spiral pitch of a screw gear having a spiral shape and formed on a peripheral surface of a gear shaft body is gradually changed; a wheel gear body on an output side that is formed such that a meshing position where the wheel gear body meshes with the worm gear body is adjustable so as to allow the wheel gear body to mesh with the worm gear body at an arbitrary position; and an adjustment operation unit that is connected with the wheel gear body, the worm gear body, or both of the wheel gear body and the worm gear body in an interlocking manner so as to adjust the meshing position where the worm gear body and the wheel gear body mesh with each other.