Propeller Shaft Buckling Design for Impact Energy Absorption
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Solution Overview
Problem
Vehicular propeller shafts face challenges in absorbing impact energy during collisions while maintaining lightweight design for improved fuel economy, as high-strength materials with low workability complicate effective geometrical configurations for energy absorption.
Innovation Solution
A propeller shaft design featuring a first tubular member with varying diameters and tapered sections, integrated with a second tubular member of higher strength, allowing for axial deformation and effective impact energy absorption, while reducing weight through thinner walls and optimized material strength differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If high-strength steel tube material is used to reduce propeller shaft weight, then fuel economy is improved, but workability deteriorates making it difficult to form complicated geometrical configurations for effective impact energy absorption
Solution Approach 1:
The propeller shaft is divided into multiple tubular members with different diameter sections (large-diameter cylindrical section, small-diameter cylindrical section, and tapered cylindrical section) that are formed integrally. This segmentation allows each section to have optimized properties: the larger-diameter sections provide structural strength while the smaller-diameter and tapered sections enable effective buckling deformation for impact energy absorption, resolving the contradiction between weight reduction and manufacturability.
2Object-affected harmful factors
If the propeller shaft is designed to buckle in axial direction for impact energy absorption, then collision impact force is reduced, but the structural complexity increases
Solution Approach 1:
Different sections of the propeller shaft are given different local qualities through varying diameters. The large-diameter cylindrical sections provide structural strength and stability, while the small-diameter cylindrical section and tapered cylindrical section are specifically designed to undergo buckling deformation during impact. This local differentiation enables effective impact energy absorption through controlled buckling while maintaining overall structural integrity, addressing the contradiction between impact protection and structural complexity.
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 design effectively absorbs impact energy, reduces the impact force on the vehicle, and improves fuel economy by minimizing weight and optimizing material usage, allowing for stable transmission of rotary motion despite vertical wheel movements.
Implementation Method 1
a portion of the propeller shaft undergoes buckling deformation in a running direction of the vehicle, that is, in the axial direction of the propeller shaft, upon application of the impact energy to the vehicle in the rearward direction
Data Source
AI summary
A vehicular propeller shaft through which a rotary motion of a drive power source is transmitted to drive wheels and which includes a first tubular member and a second tubular member. The first tubular member has a large-diameter cylindrical section, a small-diameter cylindrical section having a smaller outside diameter than the large-diameter cylindrical section, and a tapered cylindrical section formed between one end of the large-diameter cylindrical section and the small-diameter cylindrical section. The large-diameter cylindrical section, the small-diameter cylindrical section and the tapered cylindrical section are formed integrally with each other. The second tubular member is coaxially joined to the first tubular member and formed of a material having a higher degree of strength than the first tubular member.