Position-Sensitive Suspension Damping to Prevent Bottoming Out
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Solution Overview
Problem
Conventional vehicle suspension damping systems provide a constant damping rate, which can lead to the suspension "bottoming out" and potential damage, as there is no effective mechanism to vary the damping rate and prevent deformation or breakage.
Innovation Solution
The proposed solution involves a vehicle suspension damper with a cylinder containing a piston that borders compression and rebound chambers, and a bypass fluid flow path connecting these chambers, allowing the damping liquid to flow through multiple paths that change as the damper nears full compression, thereby increasing the damping rate and preventing "bottoming out".
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant damping rate is used throughout the entire stroke, then the damping mechanism is simple and reliable, but the suspension may bottom out and cause component deformation or breakage
Solution Approach 1:
The patent implements dynamic damping rate adjustment by varying the number of active bypass flow paths based on piston position. As the piston approaches full compression, fewer bypass paths remain open, automatically increasing the damping rate to prevent bottoming out. This dynamic adaptation eliminates the need for complex external control systems while achieving reliable bottoming-out prevention.
Solution Approach 2:
The patent applies different damping characteristics to different portions of the piston stroke by providing multiple bypass flow paths with varying restrictions. Each bypass path remains active at different stages of compression, creating locally optimized damping rates for specific stroke positions. This allows the system to maintain low damping during normal operation and high damping only when needed near full compression.
2Reliability
If the damping rate is increased to prevent bottoming out, then component reliability improves, but the damping mechanism becomes more complex
Solution Approach 1:
The patent combines multiple damping functions into a single integrated piston structure. The bypass flow paths are incorporated directly into the piston body, merging the damping rate variation mechanism with the primary damping function. This integration achieves reliable bottoming-out prevention without requiring separate control systems, valves, or external mechanisms, thereby limiting the increase in overall device complexity.
3Reliability
If multiple bypass flow paths are provided to vary damping rate, then bottoming out is prevented, but the device complexity increases
Solution Approach 1:
The patent implements a nested structure where bypass flow paths are integrated within the piston body itself. The bypass channels are positioned concentrically or adjacently to the main piston chamber, allowing compact arrangement of multiple flow paths within the existing piston volume. This nesting approach provides variable damping functionality without significantly increasing the overall piston size or structural 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
This design effectively increases the damping rate as the damper approaches full compression, reducing the likelihood of "bottoming out" and minimizing the risk of damage to the suspension components.
Implementation Method 1
a bypass fluid flow path connecting the compression chamber and the rebound chamber, which forms a fluid path extending between an inner diameter of the piston and a side surface of the piston directly bordering one of the compression or rebound chambers
Data Source
AI summary
An apparatus and system are disclosed that provide position sensitive suspension damping. A damping unit includes a piston mounted in a fluid-filled cylinder. A vented path in the piston may be fluidly coupled to a bore formed in one end of the piston rod, creating a flow path for fluid to flow from a first side of the piston to a second side of the piston during a compression stroke. The flow path may be blocked by a needle configured to engage the bore as the damping unit is substantially fully compressed, thereby causing the damping rate of the damping unit to increase. In one embodiment, the piston includes multiple bypass flow paths operable during the compression stroke or the rebound stroke of the damping unit. One or more of the bypass flow paths may be restricted by one or more shims mounted on the piston.