Vehicle Suspension Void Bush Perpendicular Bump Contact
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Solution Overview
Problem
Conventional void bushes in vehicle suspensions experience frictional vibration, noise, and reduced durability due to excessive contact area between inside and outside stoppers, which compromises ride comfort and steering stability.
Innovation Solution
The void bush design features inside and outside bumps that cross perpendicularly, with varying curvatures and inflection points, reducing contact area and promoting point-contact instead of plane-contact, thereby enhancing durability and lifespan by distributing abrasion and reducing frictional noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a solid type bush is used to improve steering stability, then steering stability is improved, but ride comfort deteriorates
Solution Approach 1:
The patent employs a void bush structure where the rubber material contains intentional voids or cavities. This porous configuration reduces the overall density and stiffness of the bush, allowing it to absorb vibrations and shocks more effectively, thereby improving ride comfort while maintaining sufficient structural integrity for steering stability.
Solution Approach 2:
The bush is constructed as a composite structure combining rubber material with void spaces. This composite design allows the rubber to provide necessary structural support for steering stability while the void regions contribute to vibration absorption and shock mitigation, improving ride comfort.
2Object-affected harmful factors
If a void bush is used to improve ride comfort, then ride comfort is improved, but steering stability deteriorates
Solution Approach 1:
The void bush uses rubber material with integrated voids that provide vibration absorption for improved ride comfort. The rubber matrix surrounding the voids maintains sufficient structural rigidity to preserve steering stability, resolving the trade-off between comfort and stability.
Solution Approach 2:
The composite structure of rubber combined with void spaces creates a material that exhibits both compliant behavior for vibration isolation and sufficient stiffness for steering support, simultaneously achieving improved ride comfort and maintained steering stability.
3Area of stationary object
If inside stopper and outside stopper are brought into plane-contact, then contact area is increased, but frictional vibration and noise are generated
Solution Approach 1:
The patent introduces convex protrusions on the inner stopper and corresponding concave recesses on the outer stopper. These curved geometric features transform the contact interface from a large plane-contact to localized point-contacts or line-contacts, reducing the contact area and thereby minimizing frictional vibration and noise generation.
Solution Approach 2:
The contact interface is segmented into multiple discrete convex-protrusion and concave-recess pairs distributed around the circumference. This segmentation divides a single large contact area into multiple smaller localized contact points, reducing overall friction and vibration while distributing the load.
4Area of stationary object
If inside stopper and outside stopper are brought into plane-contact, then contact area is increased, but durability of the bush is deteriorated
Solution Approach 1:
The convex protrusions and concave recesses with curved surfaces reduce contact area from plane-contact to point-contacts. This curvature design concentrates contact forces onto small areas, reducing shear stress and frictional wear, thereby improving the durability and service life of the bush.
Solution Approach 2:
By segmenting the contact interface into multiple discrete convex-recess pairs, the patent distributes wear across multiple locations rather than concentrating it on a single large contact area. This segmentation reduces the wear rate at each contact point, extending overall component durability.
Data Source
AI summary
A void bush for a vehicle suspension includes: inside bumps formed in an inside stopper and outside bumps formed in an outside stopper. In particular, the inside bumps and the outside bumps are configured to cross perpendicularly to each other to allow the inside bumps and the outside bumps to be brought into point-contact with each other during behavior of the suspension. The inside bumps are not arranged in parallel to each other and the outside bumps are not arranged in parallel to each other. Accordingly, contact area between the inside bumps and the outside bumps is greatly reduced and contact abrasion positions therebetween are diversified so that durability and lifespan of the void bush are improved.