Integrated Flywheel Cam Lobe for Engine Valve Actuation
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Solution Overview
Problem
Manufacturing fast intake valve durations for engine cam lobes is challenging due to limitations in cam base circle diameter and radius of curvature, leading to high camshaft torque and packaging difficulties, especially in supercritical carbon dioxide waste heat recovery systems.
Innovation Solution
An integrated flywheel and intake cam lobe design where the cam lobe forms a portion of the flywheel's circumferential profile, allowing the cam lobe to act on the intake valve during rotation, eliminating the need for additional components like camshafts and enabling efficient operation with supercritical carbon dioxide as a working fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large diameter cam base circle is used to achieve manufacturable radius of curvature, then manufacturing precision is improved, but device complexity and packaging difficulty increase
Solution Approach 1:
The patent merges the cam lobe function with the flywheel by integrating the cam lobe directly into the flywheel structure. This eliminates the need for a separate camshaft and its associated large base circle requirements, thereby reducing packaging complexity while maintaining manufacturable radius of curvature through the integrated design
Solution Approach 2:
The flywheel is given multiple functions: it maintains rotational momentum (traditional flywheel function) and simultaneously provides cam lobe action for valve actuation. This multi-functionality eliminates the need for a separate camshaft system, resolving the packaging complexity issue while preserving manufacturing precision
2Manufacturing precision
If a large diameter cam base circle is used to achieve manufacturable radius of curvature, then manufacturing precision is improved, but camshaft torque increases
Solution Approach 1:
By combining the cam lobe with the flywheel, the patent eliminates the separate camshaft that would require large base circle and generate high torque. The integrated design uses the flywheel's rotational energy directly to drive the cam lobe action, reducing the torque requirement
Solution Approach 2:
The patent changes the geometric parameters by using a smaller effective base circle in the integrated flywheel-cam design compared to traditional separate camshaft systems. This parameter change reduces the moment arm and consequently the torque required while maintaining acceptable radius of curvature for manufacturing
3Manufacturing precision
If cam profile is manufactured with grinding operation, then manufacturing precision is improved, but device complexity increases due to minimum radius of curvature constraints
Solution Approach 1:
The integration of cam lobe with flywheel simplifies the overall system, allowing the use of standard grinding operations on the integrated component without the additional complexity constraints that arise from separate camshaft designs with minimum radius of curvature requirements
Data Source
AI summary
A reciprocating piston engine, comprising an engine block having a piston cylinder; a piston disposed in the piston cylinder; an intake port to the piston cylinder, an intake valve to open and close the intake port to the piston cylinder; a rotatable crankshaft; a flywheel connected to the crankshaft which is rotatable with the crankshaft, the flywheel having a circumferential profile; and a cam lobe forming a portion of the circumferential profile of the flywheel wherein, during rotation of the crankshaft, the cam lobe acts on the intake valve to open the intake valve.