Inclined Rotor Surface in Rotary Piston Device
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Solution Overview
Problem
Conventional rotary piston and cylinder devices face challenges in design flexibility, assembly complexity, and fluid leakage due to symmetrical rotor designs, which restricts component sizing and increases bearing loads, leading to higher costs and reduced efficiency.
Innovation Solution
A novel rotary piston and cylinder device with an asymmetrical rotor surface orientation and independent sizing of rotor and shutter, featuring ports for fluid control and a stiffer piston design, allowing for reduced bearing loads and improved assembly processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a symmetrical rotor design is used, then the device structure is simpler to manufacture, but the rotor diameter must be larger which increases bearing loads and reduces efficiency
Solution Approach 1:
The patent applies asymmetry by orienting the rotor surface at an incline angle (30-60 degrees) relative to the plane perpendicular to the rotor axis. This asymmetric configuration allows the rotor diameter to be reduced while maintaining proper sealing and fluid control, thereby decreasing bearing loads and improving operational efficiency without compromising manufacturability
2Force
If a larger rotor diameter is used, then bearing loads are reduced, but the device size increases and assembly complexity increases
Solution Approach 1:
The inclined rotor surface creates an asymmetric geometry that optimizes the distribution of forces on bearings. By positioning the rotor surface at a specific incline angle, the design reduces the required rotor diameter while maintaining adequate bearing load distribution, thereby simplifying assembly and reducing overall device size without excessive bearing loads
3Ease of manufacture
If the rotor surface is orientated perpendicular to the axis of rotation, then the design is more conventional and easier to manufacture, but fluid leakage increases and design flexibility is restricted
Solution Approach 1:
The patent orients the rotor surface at an incline angle of 30-60 degrees relative to the plane perpendicular to the rotor axis. This asymmetric orientation improves fluid sealing performance by optimizing the contact between the rotor surface and shutter, reducing fluid leakage while maintaining manufacturing feasibility through standardized angular ranges
Solution Approach 2:
The inclined rotor surface creates different local conditions at various radial positions. The asymmetric geometry allows for optimized sealing characteristics at the rotor-shutter interface while maintaining structural integrity, thereby improving fluid sealing performance without compromising overall manufacturability
4Adaptability or versatility
If the rotor and shutter are sized independently, then design flexibility is improved, but assembly complexity increases
Solution Approach 1:
The asymmetric inclined rotor surface geometry provides a reference orientation that facilitates standardized assembly procedures. By defining the rotor surface at a specific incline angle, the design enables independent sizing of rotor and shutter components while maintaining straightforward alignment and assembly through the established angular reference
Data Source
AI summary
A rotary piston and cylinder device comprising a rotor (2), comprising a rotor surface (2a), a stator (4), a rotatable shutter (3), a piston (5) which extends from the rotor surface, the rotor surface and the stator together defining an annular chamber, and the piston arranged to rotate, through the annular chamber, and the rotor surface being orientated at an incline to a plane (P-P) substantially perpendicular to the axis of rotation (A-A) of the rotor and the rotor surface faces generally away from, or outwardly of, the axis of rotation of the rotor.