Universal Toothed Wheel for Geared Motor Series
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Solution Overview
Problem
Geared motor series require a large number of individual components to achieve high variance in transmissions, leading to increased costs, and existing methods to reduce components result in limited variance in intermediate and end stages.
Innovation Solution
A geared motor series design where one toothed wheel is provided for each axial distance, capable of pairing with two pinions to form a first gear stage, using pinions with a one-tooth difference and optimally adjusted addendum gear modification coefficients to achieve multiple transmissions with minimal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one separate toothed wheel is provided per pinion for each axial distance, then the variance in transmissions is achieved, but the total number of toothed parts increases significantly
Solution Approach 1:
The patent makes a single toothed wheel universal by designing it to be compatible with multiple different pinions at various axial distances. The toothed wheel is configured with specific geometric parameters that allow it to mesh properly with pinions having different numbers of teeth, enabling one toothed wheel to serve multiple functions across different gear stage configurations.
Solution Approach 2:
The patent employs parameter changes in the addendum gear modification coefficients of the pinions to enable compatibility. By adjusting these coefficients according to specific formulas based on the number of teeth and axial distance, the toothed wheel can maintain proper meshing conditions with different pinion variants, achieving high variance with fewer components.
2Adaptability or versatility
If the number of pinions is increased to achieve high variance in first stage transmissions, then more transmission options are available, but the device complexity and cost increase
Solution Approach 1:
The patent reduces device complexity by making toothed wheels universal components that can replace multiple specialized wheels. Instead of having separate toothed wheels for each pinion variant, a single universal toothed wheel design can interface with multiple pinions, thereby reducing the total component count while maintaining the ability to achieve various transmission ratios.
Solution Approach 2:
The patent merges the functionality of multiple specialized toothed wheels into a single universal toothed wheel design. This consolidation reduces the number of individual parts that need to be manufactured, inventoried, and assembled, while the universal design maintains compatibility across different pinion configurations through parameterized geometric relationships.
3Reliability
If addendum gear modification coefficients are optimized for minimal backlash difference, then cogging performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses parameter changes in the addendum gear modification coefficients to achieve a balance between reliability and manufacturability. The coefficients are calculated using specific formulas that account for the number of teeth, axial distance, and desired backlash characteristics, allowing for optimized cogging performance with achievable manufacturing tolerances.
Solution Approach 2:
The patent establishes standardized copying formulas for calculating addendum gear modification coefficients that can be applied across different pinion and toothed wheel configurations. These formulas provide a systematic approach to determining the appropriate coefficients, ensuring consistent cogging performance without requiring custom precision calculations for each component pair.
Data Source
AI summary
A gear motor series has two pinions with different numbers of teeth (z1a, z1b), and several toothed wheels with different numbers of teeth (z2a, z3a, z4a). The pinions and the toothed wheels are designed such that each pinion, in several predetermined axial distances (a), can be paired with one of the toothed wheels in order to form a first gear stage. One individual toothed wheel is provided for each predetermined axial distance (a), which is embodied such that it can be optionally paired with the one pinion or with the other pinion to form a first gear stage.