Rotary Engine Port Timing Layout to Limit Exhaust Reversion
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Solution Overview
Problem
In rotary engines, exhaust gas is introduced into the cylinder during the intake stroke due to port overlap, leading to reduced engine output, and there are issues with durability and interference between the rotor and apex seal, as well as a complex crankshaft assembly that requires multiple components.
Innovation Solution
The rotary engine design includes a housing with lobe accommodation parts, a rotor with separate intake and exhaust storage parts, and a crankshaft with integrated journal parts to prevent exhaust gas introduction during intake and ensure smooth exhaust discharge, while also improving the shape and support of intake and exhaust ports to reduce damage and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotor and apex seal are thermally deformed due to heat generated by combustion, then the rotor and apex seal may be damaged due to interference between the intake port or exhaust port and the apex seal, but maintaining the conventional structure cannot prevent this interference
Solution Approach 1:
The patent changes the geometric parameters of the rotor by providing recesses in the sidewall at the intake and exhaust ports. This modifies the physical shape and dimensions of the rotor surface, creating clearance zones that prevent thermal deformation interference between the rotor and apex seal while maintaining sealing effectiveness.
2Productivity
If the exhaust port and intake port are provided in the sidewall of the rotor, then opening and closing timing can be adjusted according to rotor rotation angle, but an overlap section occurs where both ports are opened causing exhaust gas to be suctioned together with mixed air
Solution Approach 1:
The patent modifies the temporal parameters of port operation by creating recesses that delay the closing timing of the exhaust port relative to the intake port. This parameter adjustment eliminates the overlap section where both ports would be simultaneously open, preventing exhaust gas from being suctioned into the intake system while maintaining proper valve timing control.
3Ease of manufacture
If the crankshaft is manufactured as a single part, then manufacturing complexity is reduced, but the crankshaft cannot be provided with an eccentric journal part and requires divided components to be assembled
Solution Approach 1:
The patent merges multiple crankshaft components into a single integrated crankshaft structure that incorporates the eccentric journal part. This combining of functions into one component simplifies the overall assembly, reduces the number of parts that need to be manufactured and assembled, while still providing the necessary eccentric journal functionality for rotor coupling.
Data Source
AI summary
The present invention provides a rotary engine comprising: a housing provided with three lobe accommodation parts; a rotor which is provided with two lobes continuously accommodated in the lobe accommodation parts, has an intake storage part communicating with an intake port provided on the front surface-side, and has an exhaust storage part communicating with an exhaust port provided on the rear surface-side; an intake-side housing cover provided with an intake hole communicating with the intake storage part; an exhaust-side housing cover provided with an exhaust hole communicating with the exhaust storage part; and a crankshaft, wherein the flow of an exhaust gas into a stroke chamber during an intake stroke is reduced by preventing the exhaust storage part, at a portion of a section in which the exhaust port is open, from communicating with the exhaust hole during the intake stroke.