Rotary Piston Transmission Assembly for Axis Conversion
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Solution Overview
Problem
Rotary piston and cylinder devices face challenges in efficiently transmitting rotation between the rotor and shutter while maintaining a compact design and minimizing friction and clearance issues, especially at high speeds.
Innovation Solution
A transmission assembly comprising a first gear connected to a rotatably mounted shutter and a gear sub-assembly that converts rotation to a different axis of rotation, with a housing portion rotationally connected to the rotor to transmit rotation effectively, utilizing gear pairs such as spur, crossed helical, or bevel gears to synchronize the rotor and shutter rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transmission assembly with gear sub-assembly is introduced to convert rotation axes, then transmission accuracy and packaging efficiency are improved, but device complexity increases
Solution Approach 1:
The transmission assembly is nested within the housing portion that extends from the rotor, integrating the gear sub-assembly into the existing rotor structure. This nesting approach allows the complex transmission mechanism to be accommodated within the existing device footprint without proportionally increasing overall complexity, thereby achieving improved transmission accuracy while managing device complexity through spatial integration.
Solution Approach 2:
The gear sub-assembly acts as an intermediary mechanism between the rotor and shutter, converting the rotation axis from parallel to orthogonal. This intermediary transmission assembly enables precise control of the shutter's rotational movement, improving transmission accuracy by providing a dedicated mechanical pathway for axis conversion rather than relying on direct or complex multi-component arrangements.
2Device complexity
If the rotor and shutter are directly coupled without transmission assembly, then device complexity is reduced, but packaging efficiency and transmission accuracy deteriorate
Solution Approach 1:
The gear sub-assembly enables the transition from parallel axis rotation (rotor) to orthogonal axis rotation (shutter) by introducing a dimensional change in the rotational pathway. This dimensional transformation allows for more compact packaging of the overall device by efficiently utilizing three-dimensional space, improving packaging efficiency while maintaining acceptable device complexity through a focused transmission mechanism.
3Reliability
If clearance between piston and aperture is minimized for sealing, then sealing performance is improved, but friction and manufacturing precision requirements increase
Solution Approach 1:
The transmission assembly provides a self-contained mechanism for axis conversion that does not require additional adjustment or fine-tuning of clearance dimensions. By integrating the gear sub-assembly within the housing portion, the design establishes fixed geometric relationships that automatically provide appropriate clearance and sealing dimensions, improving sealing performance while reducing the stringency of manufacturing precision requirements through self-defining geometric constraints.
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 solution enhances packaging efficiency, transmission accuracy, and torsional stiffness, ensuring precise timing and sealing between the piston and shutter, while allowing for adjustments to accommodate manufacturing tolerances and optimize sealing.
Implementation Method 1
a gear sub-assembly which converts rotation to an axis of rotation different to that of the shutter
Data Source
AI summary
A transmission assembly for a rotary piston and cylinder device, comprising a first gear (120) and a gear sub-assembly (15, 16, 17, 18, 19), the first gear connectable to a rotatably mounted shutter (12) of the device, and the first gear extending from a side of the shutter, and the first gear connected to the gear sub-assembly which converts rotation to an axis of rotation different to that of the shutter.