Hydraulic Piston Stroke Adjustment for Overheating Prevention
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Solution Overview
Problem
Existing devices for adjusting the swept volume of hydraulic piston machines in hydrostatic mechanical power split transmissions do not effectively prevent overheating, as they rely on pressure relief valves that convert energy into heat.
Innovation Solution
A device comprising two transverse axis piston machines connected via a common component and working lines, allowing for adjustable swept volumes, where the common component adjusts based on driver input to manage pressure and prevent overheating by limiting pressure before it exceeds the maximum permissible level, thus avoiding the conversion of energy into heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief valve is used to limit maximum pressure, then the system is protected from overload, but energy is converted into heat causing overheating
Solution Approach 1:
The control device adjusts the swept volume of the piston machine before the pressure reaches the maximum level by detecting pressure trends and preemptively modifying the swept volume, thereby preventing pressure buildup that would otherwise require relief valve activation and subsequent heat generation
Solution Approach 2:
The invention dynamically changes the swept volume parameter of the piston machine based on detected pressure conditions, allowing the system to operate at optimal pressure levels without exceeding safety thresholds, thus avoiding the need for pressure relief and the associated heat conversion
2Adaptability or versatility
If the swept volume is adjusted continuously to vary transmission ratio, then the transmission is more versatile, but the system becomes more complex
Solution Approach 1:
The common component serves multiple functions: it simultaneously adjusts the swept volume of both piston machines, acts as a control element for transmission ratio variation, and integrates with the pressure detection and control systems to provide both transmission control and pressure management capabilities
Solution Approach 2:
The invention combines the adjusting mechanisms for both piston machines into a single integrated control system where the common component coordinates the swept volume adjustments of multiple piston machines, reducing the number of independent control devices needed and simplifying the overall system architecture
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 allows for continuous adjustment of swept volumes and pressure management, preventing overheating and ensuring efficient operation by maintaining energy within safe pressure limits, thereby protecting the system from thermal damage.
Implementation Method 1
The common component can be adjusted, for example by means of a hydraulic cylinder, from a first position in a direction toward the second position
Implementation Method 2
The piston machines comprise working lines via which the two piston machines are mutually connected and form a closed circuit
Data Source
AI summary
A device for adjusting the swept volume of a first piston machine (1), of transverse axis design, and a second piston machine (2), of transverse axis design. The device including a common component (4), via which the swept volumes can be adjusted, and a valve (12) which, when a maximum pressure level in the working lines (3) is exceeded, can be rerouted in such a way that the common component (4) reroutes the swept volume in a direction toward the lower power input.