Rotary Ring Valve Sealing for Rotary Engine Leakage
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Solution Overview
Problem
Rotary engines face significant leakage and blow-by issues during compression and ignition due to the inefficiency of existing valving systems, which affect the overall performance and efficiency of the engine.
Innovation Solution
The implementation of a rotary ring valve system with snap-in rings and counter-bored holes in the valve plate, where the rings seal tighter with increasing chamber pressure and minimize side wall friction, reducing leakage and blow-by by providing a tighter seal and adjustable valve timing and indexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valving systems are used in rotary engines, then the structure is simpler, but leakage and blow-by increase during compression and ignition
Solution Approach 1:
The valve system is segmented into multiple functional components: valve disks with ports, snap-in rings for sealing, counter-bored holes in the valve plate, and circumferential channels. This segmentation allows each component to perform its specific function optimally while collectively solving the leakage problem without excessive overall complexity
Solution Approach 2:
Snap-in rings are introduced as intermediary sealing elements between the valve disks and the valve plate counter-bored holes. These rings act as mediators that prevent direct contact and leakage between the valve ports and the valve plate, effectively reducing blow-by and leakage during compression and ignition
2Reliability
If tighter sealing is achieved during compression, then leakage is reduced, but side wall friction increases
Solution Approach 1:
The circumferential channels are positioned locally at specific regions of the counter-bored holes to provide sealing where most needed during compression, while allowing other regions to maintain reduced friction characteristics. This localized approach to sealing optimizes the balance between seal tightness and friction reduction
3Productivity
If fixed valve timing is used, then the system is simpler to control, but engine efficiency and performance are limited
Solution Approach 1:
The valve timing system is made dynamic through the rotational movement of valve disks mounted on rotor shafts. The valve ports can be rotated to different angular positions, allowing variable valve timing and indexing that adapts to different engine operating conditions, thereby improving efficiency and performance
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 rotary ring valve system significantly reduces unwanted leakage and blow-by, maintaining a tighter seal under high pressure and allowing for variable valve timing and indexing, enhancing the engine's efficiency and performance.
Implementation Method 1
the ring member contacting the sidewall of the bore when the valve disk is disposed in the bore
Data Source
AI summary
A rotary engine includes a housing and elliptical rotors mounted to rotor shafts for rotation within a chamber of the housing. A valve disk mounted to a rotor shaft includes a port passing between first and second sides. A valve plate includes a bore defining a cylindrical sidewall for rotationally receiving the valve disk. The valve disk includes a groove disposed in a wall, and includes a ring member disposed in the groove that contacts the sidewall of the bore when the valve disk is disposed in the bore. The apparatus may include multiple valve disks disposed in separate bores to operate as exhaust or intake valves. Circumferential channels may be included in the bore sidewalls within which the ring members are disposed.