Hydraulic Rebound Stop Pressure Relief for Damper Overpressure
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Solution Overview
Problem
Existing hydraulic rebound stop systems in vehicle dampers can generate internal pressures that exceed desired magnitudes, and there is a need for an improved system that can be easily incorporated into existing passive damper designs with a pressure relief feature without requiring significant modifications.
Innovation Solution
A damper design featuring a hydraulic rebound stop with a sealing ring that defines a high-pressure region and a pressure relief valve, which allows pressurized fluid to pass through once a predefined pressure threshold is reached, preventing excessive pressure buildup during rebound strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic rebound stop is used to prevent abrupt stops, then the comfort and reliability are improved, but the internal pressure exceeds desired magnitudes
Solution Approach 1:
A pressure relief valve is introduced as an intermediary component between the high-pressure region and the fluid reservoir. This valve mediates the pressure buildup by opening when pressure exceeds a threshold, allowing controlled fluid flow to relieve excessive pressure while maintaining the rebound stop's ability to prevent abrupt stops.
Solution Approach 2:
The system dynamically changes the pressure parameter by transitioning from a closed high-pressure state (during normal rebound stopping) to an open state (when pressure exceeds threshold). The pressure relief valve enables this parameter change by allowing fluid to escape, thereby reducing pressure from excessive levels to acceptable ranges.
2Ease of manufacture
If existing rebound stop designs are used, then the basic cushioning function is provided, but significant modifications are required to add pressure relief features
Solution Approach 1:
The pressure relief function is segmented as a separate, modular valve component that can be independently integrated into existing rebound stop designs. This segmentation allows manufacturers to add pressure relief capability without redesigning the entire rebound stop system, thereby improving ease of manufacture while minimizing the increase in device complexity.
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 effectively manages pressure to prevent hard stops and reduces noise and stress on vehicle components by allowing controlled fluid flow and pressure relief, enhancing the performance and safety of the damper system.
Implementation Method 1
The pressure relief valve is operable to allow pressurized fluid from the high-pressure region to pass therethrough once a predefined pressure threshold has been reached
Implementation Method 2
The sealing ring at least partially defining a high-pressure region within the pressure tube during a rebound stroke
Data Source
AI summary
A damper comprises a pressure tube extending longitudinally between a first pressure tube end and a second pressure tube end, a piston arranged in sliding engagement inside the pressure tube, a piston rod coupled to the piston, a hydraulic rebound stop positioned in a first working chamber and including a sealing ring circumferentially extending around the piston rod and within the pressure tube. The sealing ring at least partially defining a high-pressure region within the pressure tube during a rebound stroke the damper further comprising a pressure relief valve in fluid communication with the high-pressure region. The pressure relief valve being operable to allow pressurized fluid from the high-pressure region to pass therethrough once a predefined pressure threshold has been reached.