Hybrid Hydraulic Cylinder Rod Eye Coupling for Weight Reduction
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Solution Overview
Problem
Existing hydraulic cylinder rods are heavy, limiting the weight reduction of construction equipment and high place operation cars, which in turn affects energy efficiency.
Innovation Solution
A hybrid round rod is created by inserting a composite material round rod, such as carbon fiber reinforced plastic, into a metal tube, with a rod eye coupled to the space formed by the length difference, allowing for robust coupling and deformation consideration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a traditional metal rod is used for the hydraulic cylinder rod, then the rod has sufficient strength and durability, but the weight of the hydraulic cylinder is high
Solution Approach 1:
The patent applies composite materials by creating a hybrid round rod that combines a metal tube (providing strength and durability) with a CFRP (carbon fiber reinforced plastic) round rod (providing lightweight properties). This composite structure allows the hydraulic cylinder rod to achieve both reduced weight and maintained strength, directly resolving the technical contradiction between weight reduction and strength preservation
2Weight of moving object
If a hybrid round rod with CFRP is used to reduce weight, then the weight is reduced, but the coupling strength between the rod eye and the rod may be compromised
Solution Approach 1:
The patent applies segmentation by dividing the rod eye into multiple functional parts: a first rod eye portion coupled to the metal tube and a second rod eye portion coupled to the CFRP round rod. This segmentation allows each portion to be optimized for its specific material interface, ensuring robust coupling reliability while maintaining the lightweight benefits of the hybrid structure
3Device complexity
If the rod eye is coupled directly to the hybrid round rod, then the structure is simple, but longitudinal deformation of the lightweight rod may affect coupling robustness
Solution Approach 1:
The patent applies dynamics by designing the rod eye coupling structure to dynamically respond to longitudinal deformation of the hybrid round rod. The multi-part rod eye structure with different portions coupled to different materials (metal tube and CFRP rod) allows the coupling to adapt to deformation, maintaining robustness while accounting for the lightweight rod's deformation characteristics
Data Source
AI summary
Proposed is a hydraulic cylinder rod in which a rod eye is robustly coupled to a hybrid round rod for weight reduction. To this end, the hydraulic cylinder rod is configured with a hybrid round rod including a metal tube and a composite material round rod provided for weight reduction inside the metal tube, wherein a side of the metal tube is formed to be relatively longer than the length of the composite material round rod to thereby provide a space defined by a length difference therebetween; and a rod eye is coupled to the space.