Helical Gear Wheel Support Rings for Meshing Alignment Stability
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Solution Overview
Problem
Large diameter helical toothed gears experience tilting deformation and meshing misalignment due to axial components of exchanged forces, leading to increased stress, noise, and reduced fatigue life.
Innovation Solution
A gear wheel design featuring a pair of axially spaced rings supporting the gear ring, creating a box-shaped body that resists axial components and translates the gear ring deformation to reduce localized contact concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single central web supports the ring gear, then the structure is simple, but the gear wheel experiences tilting deformation and meshing misalignment due to axial forces
Solution Approach 1:
The single central web is divided into two separate webs positioned at opposite ends of the ring gear. This segmentation allows each web to independently support axial forces, preventing the tilting deformation that occurs with a single central web while maintaining structural simplicity.
2Strength
If the teeth are helical, then the load capacity increases, but axial component causes tilting deformation and localized contact concentration
Solution Approach 1:
The two webs positioned at opposite ends of the ring gear act as counterbalancing supports. They generate opposing forces that counteract the axial component of the helical tooth forces, preventing tilting deformation and ensuring uniform contact distribution across the tooth surfaces.
3Reliability
If the web interface with the shaft is made robust, then fatigue failure is avoided, but weight reduction becomes difficult
Solution Approach 1:
The robust support structure is segmented into two separate webs at the ends of the ring gear rather than one large central web. This segmentation achieves the required fatigue resistance through distributed support while allowing for weight optimization of each individual web.
Data Source
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AI summary
Gear wheel with helical teeth comprising a ring gear (KR) with helical teeth, a shaft (SH) supporting the ring gear and characterised by the fact that it comprises a pair of rings (W1, W2) arranged to associate the ring gear to the relative shaft, and by the fact that the two rings of the pair of rings are mutually spaced defining a toroidal gap (H) .