Double-Ended Piston Drive Assembly Axial Load Management
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Solution Overview
Problem
Conventional piston drive systems face inefficiencies due to axial loads on single-sided pistons, leading to early failure and energy loss, and require separate lubrication that can contaminate the working fluid, limiting their application and efficiency.
Innovation Solution
A fixed displacement piston drive assembly utilizing double-ended pistons with a wobble plate and swash plate configuration, where the wobble plate is restrained by a crown restraint and lubricated through a closed-loop system, allowing for efficient energy recovery and reduced friction without contaminating the working fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-sided pistons are used in conventional compression systems, then the system structure is simpler, but axial loads cause early failure and energy loss
Solution Approach 1:
The patent employs double-ended opposed pistons where each piston has different functional ends - one end performs compression while the other performs expansion, creating an asymmetric functional distribution that balances axial loads and prevents early failure
Solution Approach 2:
The opposed piston configuration acts as a counterbalancing system where the expansion stroke on one end counteracts the compression stroke on the other end, neutralizing axial loads and reducing stress on constraint components
2Device complexity
If single-sided pistons are used, then the device structure is simpler, but work and energy are lost during compression or expansion strokes
Solution Approach 1:
The double-ended piston system enables continuous useful action by performing compression on one end while simultaneously performing expansion on the other end, eliminating idle strokes and ensuring that both piston movements contribute to useful work
Solution Approach 2:
The expansion stroke on one end of the piston recovers energy that would otherwise be lost during the compression stroke, converting waste energy back into useful work and improving overall system efficiency
3Ease of operation
If conventional lubrication systems are used, then friction is reduced, but lubrication mixes with working fluid causing inefficiencies
Solution Approach 1:
The patent extracts the lubrication function from the main working chamber by implementing a separate closed-loop lubrication system, allowing friction reduction without contamination of the working fluid
Solution Approach 2:
The system is segmented into separate functional zones - the working fluid chamber and the lubrication circuit - each optimized for its specific function without interference, preventing mixing while maintaining independent operation
Data Source
AI summary
A piston drive assembly, including: a housing enclosing each of: a plurality of cylinders, each cylinder having an axis substantially parallel to the axis of the other cylinders; a plurality of pistons, one piston in each cylinder; a wobble plate connected to each of the plurality of pistons; a swashplate rotatably fixed to a drive shaft such that the drive shaft can rotate the swash plate or the swash plate can rotate the drive shaft, wherein the drive shaft extends through the entire length of the housing.