Flexible Coupling for Camshaft Phaser Torsional Connection
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Solution Overview
Problem
Existing camshaft phaser arrangements for concentric camshaft assemblies in IC engines face challenges in torsionally or rotationally coupling multiple camshaft phasers to a crankshaft, particularly in configurations where independent phasing of intake and exhaust valves is required, and manufacturing tolerances lead to variability in axial and radial movements.
Innovation Solution
A camshaft phaser arrangement that includes a coupling with flexible connectors allowing radial and axial movement between a first and second camshaft phaser, enabling torsional connection and accommodating manufacturing tolerances, with the flexible connectors being arc-shaped or curved to provide lateral deflection for axial movement and featuring apertures for secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid coupling is used to torsionally connect camshaft phasers, then structural stability is improved, but the ability to accommodate manufacturing tolerances and axial/radial movement deteriorates
Solution Approach 1:
The patent employs flexible connectors with arc-shaped or curved geometry that can deflect laterally to accommodate radial and axial movements between camshaft phasers. These flexible elements maintain torsional connection while absorbing dimensional variations from manufacturing tolerances, resolving the contradiction between structural stability and adaptability.
Solution Approach 2:
The coupling mechanism transitions from a static rigid connection to a dynamic system where flexible connectors can deflect and move laterally. This dynamic capability allows the coupling to adapt to varying positions of camshaft phasers while maintaining functional connection, addressing both stability and tolerance accommodation requirements.
2Adaptability or versatility
If multiple camshaft phasers are stacked coaxially to enable independent phasing, then valve phasing control is improved, but device complexity deteriorates
Solution Approach 1:
The patent combines multiple camshaft phasers in a coaxial stacking arrangement, merging their functions into a single compact assembly. The flexible coupling system integrates torsional connection capabilities for multiple phasers while maintaining independent phasing control, reducing overall system complexity despite the increased functional requirements.
Solution Approach 2:
The flexible coupling mechanism serves multiple functions simultaneously: it provides torsional connection, accommodates radial movement, allows axial movement, and absorbs manufacturing tolerances. This multi-functionality reduces the need for separate components for each function, simplifying the overall device complexity while enabling independent phasing of multiple valves.
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 effectively connects and phases concentric camshaft phasers, allowing for independent phasing of intake and exhaust valves while accommodating assembly and operational variability, ensuring reliable engine performance and efficiency.
Implementation Method 1
The at least one flexible connector can deflect laterally to provide for axial movement of at least one of the first camshaft phaser or the second camshaft phaser
Data Source
AI summary
A camshaft phaser arrangement configured for a concentric camshaft assembly having inner and outer camshafts is provided. The camshaft phaser arrangement includes a first camshaft phaser, a second camshaft phaser, and a coupling that torsionally connects the first camshaft phaser to the second camshaft phaser. Each of the camshaft phasers is configured to be connected to either the inner or the outer camshaft. The coupling includes at least one flexible connector that provides for radial and axial movement between the first camshaft phaser and the second camshaft phaser.