Self-Aligning Coupling Linkage Angular Offset Compensation
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Solution Overview
Problem
Hair cutting appliances with drive trains face challenges in reducing noise and vibration emissions, and are prone to wear due to tolerance issues, which affect user comfort and performance.
Innovation Solution
A self-aligning coupling linkage with a joint section featuring a male and female connector with a circumferentially arranged deflectable compensation element to maintain angular offset compensation with minimal play, reducing noise and vibration by ensuring defined contact conditions under torque application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tight fit or press fit tolerances are used in the coupling linkage, then manufacturing precision is improved, but heat generation and wear increase due to friction
Solution Approach 1:
The coupling linkage employs a dynamic tolerance strategy where the fit between mating parts transitions from tight to loose based on operating conditions. During startup and low-speed operation, tighter tolerances reduce play and noise. During high-speed operation, looser tolerances reduce friction and heat generation, preventing wear while maintaining alignment.
Solution Approach 2:
The patent changes the tolerance parameter of the coupling linkage based on operational phase. Different clearance values are specified for different operating conditions (startup vs. running), optimizing performance across the entire operating range rather than using a single fixed tolerance value.
2Reliability
If large clearances are provided between mating parts, then wear and heat generation are reduced, but noise level increases
Solution Approach 1:
The coupling linkage uses dynamically adjusted clearances that change with operating speed and load. At low speeds, smaller clearances minimize noise and vibration. At high speeds, larger clearances reduce friction and wear, maintaining reliability while managing noise through speed-dependent design parameters.
Solution Approach 2:
The coupling mechanism incorporates periodic engagement and disengagement characteristics where contact between mating parts occurs in controlled cycles. This periodic action allows the system to transition between contact and clearance states, reducing continuous friction and heat generation while maintaining engagement when needed for torque transmission.
3Adaptability or versatility
If angular offset compensation is implemented in the drive train, then adaptability is improved for curved housings, but device complexity increases
Solution Approach 1:
The drive train is segmented into modular components with the coupling linkage serving as an independent angular offset compensation module. This segmentation allows the compensation function to be added as a discrete element rather than redesigning the entire drive train, reducing overall system complexity while maintaining adaptability.
Solution Approach 2:
The coupling linkage performs multiple functions simultaneously: it transmits torque between shafts, compensates for angular offsets, and accommodates misalignment. By combining these functions in a single component rather than using separate elements for each function, the overall device complexity is reduced while maintaining high adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces noise and vibration levels, enhances user experience, and extends the drive train's lifespan by minimizing wear and heat generation, while being easy to manufacture and assemble.
Implementation Method 1
a circumferentially arranged deflectable compensation element to maintain angular offset compensation with minimal play
Implementation Method 2
ensuring defined contact conditions under torque application
Data Source
AI summary
A self-aligning coupling linkage for a drive train, of a hair cutting appliance having a driving shaft and a non-aligning output shaft, includes a joint section having first and second connector portions that are configured to engage one another for torque transmission. The first second connector portions define a male connector having an external polygonal profile, viewed in a cross-sectional plane perpendicular to a longitudinal axis, and a female connector having an internal engagement profile. The male and female connectors are arranged in a self-aligning fashion for angular offset compensation, where wherein at least one of the male and female connectors is provided with at least one circumferentially arranged deflectable compensation element configured to urge the male and female connectors towards a centered alignment.