Vehicle Bush Mount Axial Stiffness via Segmented Rubber
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Solution Overview
Problem
Conventional bush-type mounts for vehicles have limitations in adjusting properties along three axes, leading to inadequate response to impacts and aftershock, which deteriorates driving performance due to lower axial properties compared to radial properties.
Innovation Solution
The bush-type mount design includes an outer pipe fitted into a press-fit hole in the vehicle frame, an inner pipe with bolt holes, a vulcanization-molded rubber part, and bulge parts and supports that compress or expand the rubber in the direction of the inner pipe's movement, allowing for increased axial stiffness and adjustment freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rubber part is disposed between the outer pipe and inner pipe to interconnect them, then the radial property is determined by compression resistance, but the axial property is determined by shear deformation resistance which is lower than radial property
Solution Approach 1:
The rubber part is divided into multiple regions with different functions: a first region for radial connection between outer pipe and inner pipe, and a second region for axial connection. This segmentation allows each region to be optimized for its specific deformation mode, with the second region specifically designed to enhance shear deformation resistance and thus axial property.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the rubber part. The first region is designed for radial compression resistance while the second region is specifically configured to provide enhanced shear deformation resistance. This local differentiation of properties allows the axial property to be improved without compromising the radial property.
2Adaptability or versatility
If conventional bush-type mounts are mounted in a three-point support structure, then the mount system can be assembled, but the properties in all directions cannot be set to desired levels
Solution Approach 1:
The patent enables dynamic adjustment of mount properties by varying the structural characteristics of the rubber part in different regions. The degree of freedom in property adjustment is increased by allowing independent optimization of radial and axial properties through the segmented rubber part design, enabling the mount system to adapt to different mounting conditions and impact scenarios.
3Reliability
If the axial property is set lower than radial property in conventional designs, then assembly is simplified, but the response to impacts and aftershock deteriorates
Solution Approach 1:
The rubber part is segmented into functionally distinct regions: a first region for radial connection and a second region for axial connection. This segmentation allows the second region to be specifically optimized for shear deformation resistance, thereby improving axial property and response to impacts without requiring complete redesign of the entire rubber part structure.
Solution Approach 2:
Different structural characteristics are applied locally to different regions of the rubber part. The second region is specifically configured with properties optimized for shear deformation resistance, while the first region maintains properties suitable for radial connection. This local quality differentiation improves axial property without significantly increasing overall 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
This design enhances the axial property of the bush-type mount to match the radial property, ensuring the mount system's properties are adequately set in all directions, effectively responding to impacts and aftershock, thereby improving driving performance.
Implementation Method 1
the axial property of the bush-type mount 10 may be determined based on the amount of shear deformation of the rubber part 14 caused by a load in the axial direction
Implementation Method 2
the radial property (e.g. stiffness) of the bush-type mount 10 may be determined based on the extent to which the rubber part 14 is expanded or compressed when the distance between the outer pipe 12 and the inner pipe 16 increases or decreases due to vibrations
Data Source
AI summary
The present disclosure provides a bush-type mount for a vehicle that has a high degree of freedom of setting of the properties thereof along three axes so as to increase the property thereof in the axial direction (the longitudinal direction of the vehicle) to the level of the property thereof in the radial direction (the vertical direction and the lateral direction of the vehicle) or to increase both the property thereof in the axial direction and the property thereof in the radial direction, thereby sufficiently securing the properties of an entire mount system in all directions irrespective of the direction in which the bush-type mount is disposed.