Hydro Bush Flow Path Protrusions for Dynamic Tuning
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Solution Overview
Problem
Existing hydro bushes face challenges in securing a maximum length of the flow path and a sufficient size of the liquid chamber due to package restrictions, which limits their ability to tune dynamic characteristics effectively.
Innovation Solution
The hydro bush design includes protruding portions in the flow path that are spaced apart and arranged in a staggered manner, allowing the working fluid to flow in a zigzag pattern, increasing the flow distance without increasing the size of the hydro bush, while adjusting flow velocity and distance by varying the size, shape, and position of these protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the flow path is increased to tune dynamic characteristics, then the dynamic characteristics are improved, but the size of the liquid chamber is reduced
Solution Approach 1:
The flow path is configured to extend in the circumferential direction of the rubber portion rather than only in the axial direction. This dimensional change allows the flow path length to be increased without proportionally increasing the axial length of the hydro bush, thereby maintaining adequate liquid chamber volume while achieving the desired flow path length for dynamic characteristic tuning
Solution Approach 2:
The flow path is designed with curved or meandering configuration instead of a straight line, allowing the working fluid to travel a longer distance through the rubber portion. This curved path arrangement increases the effective flow path length within the available space, resolving the contradiction between flow path length and liquid chamber size
2Length of stationary object
If the size of the hydro bush is limited due to package restriction, then the installation space is saved, but the flow path length cannot be secured
Solution Approach 1:
The flow path utilizes the circumferential dimension of the rubber portion to extend its length, rather than being constrained to the axial dimension. This allows the flow path length to be increased without increasing the overall axial length of the hydro bush, thereby maintaining compact size while achieving sufficient flow path length
Solution Approach 2:
The flow path is nested within the rubber portion structure, utilizing the annular space between the inner and outer surfaces of the rubber portion. This nesting arrangement allows the flow path to be embedded within the existing structure without requiring additional external space, resolving the contradiction between compact size and sufficient flow path length
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 configuration enables the hydro bush to enhance dynamic characteristics by increasing the flow path length and maintaining a sufficient liquid chamber size, thereby improving the absorption of impact forces and vibration mitigation.
Implementation Method 1
the working fluid more stably absorbs impact force, which is transmitted from the vehicle when the vehicle moves, using damping force
Data Source
AI summary
A hydro bush includes an outer pipe, an inner pipe, a rubber portion that is installed between the outer pipe and the inner pipe, and stoppers that are installed at both side ends. The hydro bush further includes a liquid chamber which is formed between the outer pipe and the rubber portion, and filled with a working fluid; and a flow path which is formed between the outer pipe and the rubber portion, and connected to the liquid chamber so as to guide the working fluid when the working fluid flows, in which the flow path includes a protruding portion which is formed to protrude inward. Accordingly, a flow distance of a working fluid flowing along the flow path may be increased without increasing a size of the hydro bush, thereby securing various dynamic characteristics.