Reinforced Cast Iron Connecting Rod for Lower Weight and Cost
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Solution Overview
Problem
Existing steel connecting rods in internal combustion engines are heavy, leading to increased production costs and energy consumption due to their high density and weight, which is not conducive to reducing energy consumption.
Innovation Solution
A design method for a connecting rod that involves determining the weight difference between a standard steel connecting rod and a nodular cast iron connecting rod of the same size, simulating reinforcement with a preset weight of material to increase the shank's cross-sectional area, and calculating the reinforcing thickness to achieve a lighter and stronger nodular cast iron connecting rod with comparable stiffness to steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-performance alloy steel is used to ensure high strength and stiffness, then the connecting rod achieves required mechanical performance, but the weight and production cost increase
Solution Approach 1:
The patent uses composite materials by combining nodular cast iron (base material) with steel wire (reinforcement) to create a connecting rod that achieves steel-like strength and stiffness while maintaining the lighter weight and lower cost benefits of cast iron. The steel wire is embedded in the cast iron matrix to form a composite structure that optimizes both mechanical performance and weight.
2Strength
If high-performance alloy steel is used to ensure high strength and stiffness, then the connecting rod achieves required mechanical performance, but the production cost increases
Solution Approach 1:
The patent employs composite materials combining nodular cast iron with steel wire reinforcement. This approach reduces production cost by using cheaper cast iron as the base material while achieving required strength through the steel wire reinforcement, avoiding the need for expensive high-performance alloy steels.
Solution Approach 2:
The patent applies local quality by concentrating steel wire reinforcement in specific high-stress areas of the connecting rod (such as the shank and journal regions) rather than using uniform high-strength material throughout. This localized reinforcement achieves the required mechanical performance while minimizing material cost.
3Strength
If the shank cross-sectional area is increased to enhance strength and stiffness, then the mechanical performance improves, but the weight increases
Solution Approach 1:
The patent uses composite materials to enhance the shank's strength and stiffness without significantly increasing weight. The steel wire reinforcement within the nodular cast iron matrix provides high strength-to-weight ratio, allowing the shank to maintain or increase cross-sectional area for improved mechanical performance while keeping the overall weight increase minimal compared to using solid steel.
Data Source
AI summary
The invention provides a design method for a connecting rod. The connecting rod includes a first end, a shank and a second end; and the shank is connected between the first end and the second end. The design method includes: determining a weight m1 of a standard steel connecting rod; determining a weight m2 of a nodular cast iron connecting rod having the same size with the standard steel connecting rod; and simulating to reinforce the shank with a reinforcement material having a preset weight m, and calculating a size of the reinforced shank; where m1>m2, and m<m1−m2. The present invention overcomes the technical problem that existing steel connecting rods have larger weights.