Composite Connecting Rod Yoke Reinforcement via Interleaved Pins
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Solution Overview
Problem
The existing method for manufacturing composite connecting rods limits the mechanical strength of the yoke due to restricted additional thickness, which is difficult to achieve with multiple intermediate layers in the 2.5D fabric, resulting in insufficient mechanical resistance against longitudinal forces.
Innovation Solution
The method involves creating a mandrel with base layers of reinforcing fibers and additional interposed layers at the yoke regions, inserting pins through these layers, and injecting resin for polymerization, which enhances the mechanical resistance by reinforcing the connections between layers rather than solely increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple intermediate layers are added to increase yoke thickness, then mechanical strength should improve, but the manufacturing complexity and difficulty increase significantly
Solution Approach 1:
The fabric is segmented into base layers and additional layers that can be independently added. The additional layers are inserted between base layers at specific locations (yoke regions) rather than requiring the entire fabric stack to be thickened, thereby increasing strength locally without proportionally increasing overall manufacturing complexity
Solution Approach 2:
The patent applies local quality by adding thickness only where mechanically necessary (at the yoke regions) rather than uniformly throughout the entire connecting rod. This is achieved by inserting additional layers between base layers at specific locations, optimizing strength where stress concentration occurs while maintaining simplicity elsewhere
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 approach significantly increases the mechanical strength of the yoke by improving the cohesion between layers, effectively resisting multidirectional stresses and delamination, thereby enhancing the overall mechanical resistance of the connecting rod.
Implementation Method 1
inject resin into the base layers and the interlayers and polymerize this resin
Implementation Method 2
inserting at the level of each fork wing of the barbs passing through the intermediate layers and the base layers
Data Source
Figure 1~2
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Figure 5~7
AI summary
The invention relates to a method for making a connecting rod (6) made of a composite material and including a yoke (7) for receiving a mechanical axis, said yoke (7) including two parallel arms (7a, 7b) perpendicular to the mechanical axis, wherein the method comprises the steps of: making a mandrel (11) defining a single piece sufficiently rigid for receiving fiber layers (8a-8e, 9a-9d); applying onto said mandrel (11) base fiber layers (8a-8e) and additional layers (9a- 9d) interleaved between the base layers (8a-8e)at the yoke (7, 7a, 7b) in order to form an additional thickness thereon; inserting lugs (13a, 13b) extending through the intermediate layers (9a-9d) and the base layers (8a- 8e); injecting resin into the base layers (8a- 8e) and the intermediate layers (9a-9d) and polymerizing said resin.