Work Vehicle Suspension With Intermediate Mass Damping
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Solution Overview
Problem
Existing front mechanical suspension arrangements for work vehicles fail to effectively dampen vibrations and noise while maintaining comfort and roll stiffness, often requiring compromises that increase costs, such as the use of anti-roll bars.
Innovation Solution
A suspension arrangement comprising a primary elastic block, a secondary elastic block, and an intermediate mass axially interposed between them, with specific materials and configurations to optimize damping across a wide frequency range, including the use of polymeric materials and a metallic intermediate mass to reduce noise and roll motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If very soft silent-blocks are used to improve comfort, then comfort level is improved, but roll moment is reduced
Solution Approach 1:
The suspension arrangement is divided into multiple silent-blocks (first, second, third, and fourth silent-blocks) positioned at different locations and orientations. Each silent-block segment handles specific directional forces, allowing the system to provide both comfort (through soft vertical damping) and roll stability (through coordinated resistance to rolling moments across multiple connection points).
Solution Approach 2:
Different silent-blocks are configured with different properties and orientations to address local requirements. The first and second silent-blocks are arranged to resist vertical movements for comfort, while the third and fourth silent-blocks are specifically oriented to resist rolling movements, providing localized quality optimization for both comfort and roll stability.
2Stability of the object's composition
If anti-roll bar is added to limit roll movements, then roll stability is improved, but noise issues increase and costs increase
Solution Approach 1:
Instead of using a traditional anti-roll bar with rigid mechanical connections, the invention uses multiple compliant silent-blocks that replicate the roll-resisting function through elastic deformation. The third and fourth silent-blocks are positioned and oriented to provide roll resistance through their elastic properties, copying the anti-roll function without the rigid mechanical connections that generate noise.
Solution Approach 2:
The invention replaces the mechanical anti-roll bar system with an elastic silent-block system. The rigid mechanical connections of a traditional anti-roll bar are substituted with elastic silent-blocks that provide roll resistance through material deformation, eliminating the noise-generating mechanical joints while maintaining roll stability.
3Force
If high stiffness at silent-blocks is maintained to ensure sufficient roll moment, then roll stability is improved, but comfort level deteriorates
Solution Approach 1:
The suspension system is segmented into multiple silent-blocks with different functional specializations. The first and second silent-blocks are optimized for vertical vibration isolation (comfort) while the third and fourth silent-blocks are positioned and oriented to provide roll resistance. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different silent-blocks have different local qualities and configurations. The silent-blocks are arranged with specific orientations and positions to provide directional compliance - softer in vertical directions for comfort, and stiffer in rolling directions for stability. This local quality differentiation resolves the contradiction between comfort and roll moment.
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 suspension arrangement provides efficient damping of both low and high-frequency vibrations and noise, maintaining comfort while reducing costs by optimizing stiffness and mass distribution, ensuring low acceleration transmission and durability.
Implementation Method 1
a first elastic block (5), a second elastic block (6) and an intermediate mass (7) axially interposed between said first and second elastic blocks (5, 6)
Implementation Method 2
an intermediate mass (7) axially interposed between said first and second elastic blocks (5, 6), said intermediate mass (7) being greater than 3 kg
Data Source
Figure 1
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AI summary
Suspension arrangement (1) for suspending a cab with respect to a body of a work vehicle, comprising a primary elastic block (5), a second elastic block (6) and an intermediate mass (7) interposed in series between first and second elastic blocks (5, 6), the primary elastic block (5) cooperate at contact with a portion (3) of body from one side and with intermediate mass (7) from the opposite side, the second elastic block (6) cooperate at contact with a portion (2) of cab from one side and with intermediate mass (7) from the opposite side, first and second elastic blocks (5, 6) and intermediate mass (7) being maintained in contact with the aforesaid elements in a preset preload thanks to compacting means (8).