Hydraulic Bump Stop Valving for Position-Sensitive Damping
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Solution Overview
Problem
Conventional bump stops face challenges in space constraints, requiring compact designs while maintaining functionality, and suffer from non-independent tuning of compression and rebound forces, leading to harsh user experiences due to speed-dependent hydraulic damping.
Innovation Solution
A hydraulic bump stop design incorporating a flow controlling element with varying geometry that adjusts the gap between the orifice and the element based on compression, providing position-sensitive damping forces and reducing harshness through valving, eliminating the need for a negative spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional orifice damping is used to control compression and rebound, then the bump stop can be compact, but compression and rebound cannot be independently tuned and impact harshness is significant
Solution Approach 1:
The damping system is segmented into two independent control mechanisms: a compression orifice for compression damping and a rebound orifice for rebound damping. This allows independent tuning of compression and rebound forces while maintaining a compact overall structure.
Solution Approach 2:
The bump stop employs dynamic damping control where the damping force varies based on piston velocity and direction. The compression and rebound orifices provide speed-dependent damping that adapts to different motion phases, reducing harshness while maintaining compact dimensions.
2Force
If hydraulic damping is used, then damping force can be controlled, but it is only speed dependent resulting in very high damping forces and excessively harsh user experience
Solution Approach 1:
Different local damping characteristics are provided through separate compression and rebound orifices with different sizes and flow characteristics. The compression orifice is sized to provide gentle compression damping, while the rebound orifice provides controlled rebound damping, creating locally optimized damping quality for each phase of motion.
Solution Approach 2:
The damping parameters are changed by varying the orifice dimensions and fluid viscosity to achieve desired damping forces. The compression orifice is designed with specific flow parameters to limit maximum compression damping force, while rebound damping parameters are adjusted separately to optimize user comfort during rebound phase.
3Volume of moving object
If compact bump stop design is used, then space constraints are met, but stroke efficiency decreases and dead length increases
Solution Approach 1:
The piston and damping components are nested within the bump stop body in a compact arrangement. The compression and rebound orifices are integrated into the piston structure, allowing maximum stroke efficiency within a minimized overall length while maintaining all necessary damping functions.
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 design achieves increased stroke efficiency, smoother damping progression, and reduced harshness by controlling damping forces based on position rather than speed, enhancing packaging efficiency and user comfort.
Implementation Method 1
a first chamber (132) configured to receive the hydraulic fluid, a second chamber (126) disposed within the interior of the shaft (102) and fluidly connected to the first chamber (132) via an orifice (122)
Implementation Method 2
a flow controlling element (118) having a varying geometry such that a gap between the orifice (122) and the flow controlling element (118) varies according to a compression of the shaft (102) within the bump stop body (112), wherein a size of the gap impacts fluid flow through the orifice (122)
Data Source
AI summary
Disclosed herein is a hydraulic bump stop comprising a bump stop body comprising a chamber; a shaft telescopically engaged with the bump stop body, a piston slidably disposed with the bump stop body and coupled to a first end of the shaft, the piston comprising an orifice for fluidly connecting the chamber to an interior of the shaft, and a flow controlling element coupled to a surface of the bump stop body opposing the orifice and aligned with the orifice such that the flow controlling element enters the orifice during operation of the hydraulic bump stop, the flow controlling element having a varying geometry such that a gap between the orifice and the flow controlling element varies according to a compression of the shaft within the bump stop body, wherein a size of the gap impacts fluid flow through the orifice during operation of the hydraulic bump stop.