Oscillating Piston Engine With Eccentric Gas Exchange
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Solution Overview
Problem
Existing oscillating-piston machines face challenges in managing centrifugal forces and gas exchange complexity, particularly at high speeds, which affect the efficiency and structural simplicity of the engine design.
Innovation Solution
The oscillating-piston machine design features a piston cage with slidably mounted pistons and eccentric gas exchange openings on the housing end face, allowing axial gas flow and eliminating the need for actively controlled valves, with a sealing arrangement to ensure gas-tight operation during compression and expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pistons are arranged perpendicular to the axis of rotation to minimize working chamber volumes at TDC, then the centrifugal forces acting on the pistons are at their maximum, but the pistons must be expanded or pivoted apart against the centrifugal forces at high speeds
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the working chambers on the axis of rotation rather than perpendicular to it. This causes the centrifugal forces to act in the direction of piston movement rather than opposing it, thereby supporting the expansion cycle and reducing the force resistance at high speeds while maintaining precise working chamber volume control
2Ease of operation
If controlled valves are provided for gas exchange openings to enable precise gas exchange control, then the gas exchange control is improved, but the design complexity increases
Solution Approach 1:
The piston cage is designed with self-service gas exchange control through its own rotational movement. The cage's rotation automatically opens and closes the gas exchange openings at the appropriate times during the cycle, eliminating the need for separate controlled valves while maintaining precise timing and simple structure
Solution Approach 2:
The piston cage serves multiple functions: it houses the pistons, provides the working chamber volume control through its rotation, and simultaneously acts as the gas exchange control mechanism. This multi-functionality eliminates the need for dedicated valve components, reducing design complexity while maintaining operational precision
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
This configuration reduces centrifugal forces acting against the pistons, supports the expansion cycle, and enables simple, valve-free gas exchange control, enhancing efficiency and structural simplicity while maintaining high working pressures.
Implementation Method 1
the centrifugal forces acting on the pistons are at their maximum as the pistons revolve around the axis of rotation. As a result, at high speeds, the pistons must be expanded or pivoted apart against the centrifugal forces
Data Source
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AI summary
The invention relates to an oscillating piston engine comprising a housing (12) that contains a first and at least a second piston (30, 32), both of which can rotate about a fixed rotational axis (38) in the housing (12) and which when rotating about said axis (38) execute counter-rotating displacements back and forth about a pivoting axis (42) that runs perpendicular to the rotational axis (38) through the centre of the housing. A working chamber (54) is situated between opposing end faces (46, 48) of the first and at least second piston (30, 32). The housing (12) is provided with at least one gas exchange opening (94, 96) for admitting or discharging a gas into or from the working chamber (54). The pistons (30, 32) are arranged in such a way that the rotational axis (38) runs through the working chamber (54). The pistons (32) are mounted to slide in a piston cage (72), which is located in the housing (12), is concentric with the rotational axis (38), and rotates together with the pistons (30, 32) about said axis (38). The gas exchange opening (94, 96) is arranged eccentrically in relation to the rotational axis (38), on one end face (22) of the housing (12).