Straight Shaft Rotary Engine Design for Power-to-Weight Optimization
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Solution Overview
Problem
Reciprocating piston engines are complex, inefficient, prone to catastrophic failure, and have a low power-to-weight ratio, leading to mechanical issues and wasted energy, particularly in applications requiring agility and portability.
Innovation Solution
A non-planetating rotary piston engine design with a straight shaft configuration, featuring a housing and rotating piston with an expansible combustion chamber, a moveable cylinder head, and a pressurized air chamber, optimized for stoichiometric fuel-to-air ratio and efficient combustion, along with a low-current high-voltage spark generator for ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reciprocating piston engine design is used, then reliable power generation is achieved, but device complexity increases due to multiple pistons, valves, valve trains, cams, lifters, crankshaft and connecting rods
Solution Approach 1:
The engine is divided into multiple independent combustion chambers (at least two) that operate in parallel on a single rotating piston, allowing the system to maintain reliability through redundancy while reducing overall mechanical complexity compared to traditional multi-piston designs
Solution Approach 2:
Instead of using a reciprocating piston motion with crankshaft conversion, the invention inverts the approach by using a rotating piston that directly generates rotary motion, eliminating the need for crankshaft, connecting rods, and valve trains while maintaining reliable power generation
2Power
If reciprocating piston engine design is used, then power generation is achieved, but power to weight ratio decreases due to additional engine mass
Solution Approach 1:
The invention extracts and eliminates unnecessary heavy components such as the crankshaft, connecting rods, and complex valve trains from the traditional reciprocating engine design, retaining only the essential elements (rotating piston, combustion chambers, fuel injection system) needed for power generation, thereby significantly reducing engine mass while maintaining power output
Solution Approach 2:
By inverting from reciprocating motion to direct rotary motion, the design eliminates the heavy crankshaft and associated components, achieving a lighter engine that produces comparable or superior power output
3Power
If reciprocating piston engine design is used, then combustion power is generated, but energy efficiency decreases due to power losses at top dead center and incomplete power stroke transfer
Solution Approach 1:
By inverting from reciprocating to rotary motion, the engine eliminates the top dead center position where no torque is generated, ensuring continuous power delivery throughout the entire rotation cycle and preventing energy losses associated with stroke transitions
Solution Approach 2:
The rotating piston design enables continuous combustion events and continuous torque generation throughout the rotation, eliminating the intermittent power delivery and energy losses inherent in reciprocating engines during stroke transitions
4Power
If reciprocating piston engine design is used, then combustion is achieved, but energy efficiency decreases due to oil sump and cooling system requirements consuming more than half of potential horsepower
Solution Approach 1:
The invention extracts and eliminates the oil sump and complex liquid cooling system from the engine design, using alternative approaches (such as air cooling or simplified lubrication) that consume minimal power, thereby retaining more than half of the potential horsepower for useful work
Solution Approach 2:
The engine design incorporates self-cooling or self-lubricating features that require minimal or no auxiliary power, eliminating the need for power-consuming oil pumps and cooling systems while maintaining proper engine operation
5Power
If reciprocating piston engine design is used, then power generation is achieved, but starting difficulty increases requiring idle operation when equipment is stationary
Solution Approach 1:
By inverting from reciprocating to rotary motion, the engine eliminates the mechanical complexity and friction associated with starting reciprocating engines, enabling easier cold starts and allowing the engine to be shut down completely when stationary without requiring idle operation
Solution Approach 2:
The rotary design allows for smoother acceleration from standstill and continuous operation without the dead spots and mechanical resistance encountered in reciprocating engines, improving starting ease and eliminating the need for idle operation
6Power
If reciprocating piston engine design is used, then power generation is achieved, but reliability decreases due to catastrophic failure from extreme g-forces on reciprocating components
Solution Approach 1:
By inverting from reciprocating to rotary motion, the invention eliminates the extreme g-forces and abrupt directional changes that cause connecting rods to shatter and timing chains to break, significantly improving reliability and preventing catastrophic failures
Solution Approach 2:
The engine uses multiple independent combustion chambers that can operate independently, so that failure in one chamber does not cause catastrophic failure of the entire engine, improving overall system reliability
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 design enhances simplicity, longevity, and energy efficiency, reducing mechanical failures and energy wastage, while providing a higher power-to-weight ratio and improved starting efficiency without the need for an oil sump or complex cooling systems.
Implementation Method 1
an air chamber configured to contain pressurized air, and the air of the pressurized air chamber is pressurized by the rotary action of the piston
Implementation Method 2
a low-current high-voltage spark generator for ignition
Implementation Method 3
a mixing body fluidically coupled to the air chamber and the fuel chamber and configured to maintain a stoichiometrically optimized ratio of the fuel to the air
Implementation Method 4
an expansible combustion chamber that produces at least two combustion events for every rotation of the piston about the axis
Data Source
AI summary
A straight shaft non-planetating rotary piston engine includes a housing and at least one rotating piston mounted for circular rotation about an axis within the housing. The piston and the housing define an expansible combustion chamber that produces at least one combustion events for every rotation of the piston about the axis. The invention also includes a moveable cylinder head having a profile roller. The profile roller cooperates with an open face profile impressed into a rotary encoder. The open face profile is configured to pull the cylinder head into near-contact with the rotating piston face, and the moveable cylinder head is spring biased to repel the moveable cylinder head away from the rotating piston face.