Laminated Leaf Spring Unit for Large Displacement in Tight Space
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Solution Overview
Problem
Conventional coil springs fail to achieve large displacement due to wire contact during compression, while leaf springs require significant space for wide reversible deformation, necessitating a solution for increased displacement range with reduced installation space.
Innovation Solution
A spring unit comprising plate-shaped leaf springs made of laminated sheet-shaped members bonded by intermolecular forces, with support and load parts connected to the leaf springs, allowing for wider reversible deformation and reduced space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a coil spring is used, then the structure is compact, but the displacement range is limited due to wire contact during compression
Solution Approach 1:
The spring is segmented into multiple thin plate-shaped members (5 sheets in the embodiment) laminated together. Each sheet can deform independently through flexure, allowing larger displacement without the wires contacting each other as in conventional coil springs. This segmentation enables the spring to achieve greater compression distances while maintaining structural integrity.
Solution Approach 2:
The invention transitions from a three-dimensional coil structure to a two-dimensional plate-based structure. The plate-shaped members bend in a different dimensional mode (flexure rather than coil compression), which fundamentally changes the deformation mechanism and allows for larger displacement ranges without the geometric constraints of wire contact.
2Length of moving object
If a leaf spring is used to achieve large displacement, then the reversible deformation range increases, but the installation space becomes larger
Solution Approach 1:
The leaf spring is divided into multiple thin laminated sheets (5 sheets in the embodiment) rather than using a single thick plate. This segmentation allows the spring to achieve the same or greater reversible deformation range while reducing the overall thickness and installation space requirements, as the multiple thin layers can bend more efficiently than a single thick plate.
Solution Approach 2:
The spring uses a composite structure of multiple laminated sheets bonded together by intermolecular forces. This composite construction provides both the flexibility needed for large reversible deformation and the structural integrity to maintain compact dimensions, effectively combining the benefits of multiple thin plates into a unified compact component.
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 spring unit achieves a wider reversible deformation range than conventional coil springs and reduces installation space compared to leaf springs, with the sheet-shaped members providing high rigidity and bending flexibility.
Implementation Method 1
Each of the leaf springs is defined by a plurality of sheet-shaped members laminated on one another in a thickness direction thereof. The plurality of sheet-shaped members are bonded together by intermolecular force
Implementation Method 2
A spring unit includes a spring part comprising a plurality of plate-shaped leaf springs. Each of the leaf springs is defined by a plurality of sheet-shaped members laminated on one another in a thickness direction thereof
Data Source
AI summary
A spring unit includes a spring part including multiple plate-shaped leaf springs, a plate-shaped support part and a plate-shaped load part connected to opposite ends of each of the leaf springs in a first direction. Each of the leaf springs is defined by multiple sheet-shaped members laminated on one another in a thickness direction thereof. The multiple sheet-shaped members are bonded together by intermolecular force.