Subframe Mounting Bush with Multi-Bridge Rubber Structure
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Solution Overview
Problem
The subframe mounting bush faces a conflicting requirement between enhancing responsiveness and NVH performance, as high rigidity is needed for responsiveness but low rigidity is required for effective vibration insulation, leading to a complex and costly solution with hydro bushes that only increase damping at specific frequencies.
Innovation Solution
A subframe mounting bush structure with an elliptic outer shell, multiple inner shells, and bridges of equal rigidity, featuring side surface spaces and reinforcement rubber, along with a rubber bridge connecting the bridges, which maintains lateral rigidity while increasing vibration insulation by dispersing external forces and reducing bridge rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of the mounting bush is increased to enhance responsiveness, then the handling responsiveness is improved, but the vibration insulation performance deteriorates
Solution Approach 1:
The mounting bush is divided into multiple bridges (first bridge, second bridge, and rubber bridge) that connect inner shells to the outer shell. Each bridge independently supports lateral loads, distributing the force transmission path and maintaining overall rigidity while allowing individual bridge deformation for vibration isolation.
Solution Approach 2:
The mounting bush combines rubber material with a multi-bridge structural configuration. The rubber material provides inherent damping properties, while the multi-bridge structure maintains lateral rigidity. This composite approach allows the bush to simultaneously achieve responsiveness and vibration insulation without requiring complex hydro bush mechanisms.
2Object-affected harmful factors
If the rigidity of the mounting bush is decreased to improve vibration insulation, then the NVH performance is enhanced, but the handling responsiveness deteriorates
Solution Approach 1:
By segmenting the bush into multiple bridges, each bridge can be designed with optimized rigidity characteristics. The distribution of multiple bridges ensures that the cumulative lateral rigidity is sufficient for responsiveness, while individual bridge flexibility enables vibration insulation.
Solution Approach 2:
Different regions of the mounting bush have different rigidity characteristics. The bridges are designed with specific rigidity values that balance local flexibility for vibration isolation with overall structural rigidity for responsiveness. The rubber material provides localized damping at critical vibration frequencies.
3Object-affected harmful factors
If a hydro bush with complex structure is used to increase damping at specific frequency, then the NVH performance is improved, but the manufacturing cost and field claims increase
Solution Approach 1:
The patent replaces complex hydro bush mechanisms with a simpler rubber-based multi-bridge structure. This simpler design reduces manufacturing costs and eliminates the need for complex hydraulic systems, while still achieving effective NVH performance through the inherent damping properties of rubber and the optimized bridge configuration.
Solution Approach 2:
The invention extracts and eliminates the complex hydro bush mechanism from the design. Instead, it uses a simplified rubber bush with multiple bridges that achieves the same NVH improvement through structural design rather than complex mechanical systems, thereby reducing manufacturing complexity and cost.
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 enhances handling responsiveness and vibration insulation, maintaining lateral rigidity while increasing the vibration insulation rate, even if bridge rigidity is reduced, thus addressing the conflicting performance needs without increasing costs.
Implementation Method 1
a rubber bridge for connecting the first bridge with the second bridge may be positioned in the inter-space
Implementation Method 2
enhancing the vibration insulation by insulating the vibration from the suspension
Data Source
AI summary
A subframe mounting bush structure for improving NVH performance is provided. The subframe mounting bush structure includes an outer shell, a first bridge formed in the outer shell along a longitudinal direction, a second bridge formed in the outer shell along the longitudinal direction, a first inner shell positioned at a center of the first bridge, and a second inner shell positioned at a center of the second bridge.