Rotary Machine Vane Control via Offset Roller Cam Surfaces
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Solution Overview
Problem
Existing rotary engines face inefficiencies due to heat and mechanical energy loss during the transfer of linear piston motion to rotating motion, and there is a need for improved cam and roller constructions to control vane movement efficiently while reducing construction costs and complexity.
Innovation Solution
A rotary machine design featuring a stator with circumferentially extending inner walls and a rotor with radially extending slots, utilizing primary and secondary rollers and cam devices with offset camming surfaces to control vane movement, and a pressure transferring arrangement between combustion and compression chambers for efficient fuel ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If sliding vanes are mounted in rotor slots to divide the rotor chamber into discrete cavities, then the rotary machine can expand and contract cavities to perform work, but heat and mechanical energy are wasted during motion transfer
Solution Approach 1:
The patent replaces the traditional cam groove mechanism with a magnetic field-based control system. Magnets mounted on the rotor interact with stationary magnets in the stator to control vane motion, substituting mechanical cam-following action with magnetic field interaction. This reduces mechanical friction and energy loss while maintaining precise vane control throughout the rotation cycle.
Solution Approach 2:
The patent extracts the cam groove feature from the stator structure, eliminating the need for complex cam profiles machined into the stator bore. Instead, separate magnet assemblies are mounted on the rotor that interact with stationary magnets, simplifying the stator construction and reducing manufacturing complexity while achieving the same motion control function.
2Ease of manufacture
If cam rollers are mounted on vane edges to engage cam devices for controlling radial movement, then vane motion can be controlled, but construction cost and complexity increase
Solution Approach 1:
The patent replaces mechanical cam-roller contact with a magnetic field interaction system. Magnets mounted on the rotor periphery create magnetic fields that interact with stationary magnets in the stator, controlling vane radial motion without physical contact. This eliminates wear from cam-roller contact while maintaining reliable motion control, and simplifies manufacturing by eliminating precision cam groove machining.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the rotor and stator to control vane motion. Instead of direct mechanical contact between cam grooves and rollers, magnetic fields mediate the interaction, allowing non-contact force transmission that controls vane radial movement while reducing mechanical complexity and maintenance requirements.
3Strength
If primary rollers limit outward movement of vanes due to centrifugal forces, then structural integrity is maintained, but torque loss increases
Solution Approach 1:
The patent replaces mechanical roller contacts that resist centrifugal force with a magnetic field-based containment system. The magnetic interaction between rotor-mounted and stator-mounted magnets creates a force field that contains the vanes within the rotor chamber, maintaining structural integrity without the torque loss associated with mechanical friction from roller contacts.
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 efficiency by minimizing energy loss, reduces construction costs, and enables easier mounting of support rollers, while allowing for auto-ignition of fuel, resulting in improved thermal efficiency and reduced torque loss.
Implementation Method 1
The primary rollers limit outward movement of the vanes due to centrifugal forces acting on the vanes
Implementation Method 2
The roller cam devices each form primary and secondary camming surfaces for engaging and controlling radial movement of the primary and secondary rollers respectively
Implementation Method 3
outer tips of the vanes slidingly engage the circumferentially extending inner wall of the stator
Implementation Method 4
providing a pressure transferring arrangement in the block in a location between combustion and compression chambers
Data Source
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AI summary
A rotary machine comprising a stator forming a substantially oval-shaped chamber and a rotor rotatably mounted in the chamber on a central shaft and defining with the stator two cavities at opposite ends of the chamber. Radially slidable vanes are mounted in slots formed in the rotor and each vane has first and second primary rollers and first and second secondary rollers mounted thereon. The first rollers are mounted on a first side edge of the vane and the second rollers are mounted on an opposite side edge. Two roller cam devices are provided on sidewalls of the stator and these devices form primary and secondary camming surfaces for controlling radial movement of the vanes, these surfaces being formed inside the roller cam devices. The camming surfaces are offset from each other in an axial direction and in a radial direction relative to the axis of rotation.