Railcar Bone Structure for Weight Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The strength of a railcar's carbody needs to be increased to handle varying loads during travel, but simply adding more reinforcing members increases the weight, which is undesirable.
Innovation Solution
A bone structure is integrated into the railcar's side bodyshell, featuring first lateral bones joined to a wainscot panel and a side post intersecting with these bones, with cutout portions allowing the bones to extend continuously and additional flange portions connecting to the wainscot panel, enhancing the strength of the outer plate while reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If more reinforcing members are added to the side bodyshell, then the strength of the outer plate is improved, but the weight of the carbody increases
Solution Approach 1:
The side post integrates multiple functions: it connects to the pier panel via first flange portions, connects to the wainscot panel via second flange portions, and provides cutout portions for lateral bones to pass through. This merging of connection functions into a single component achieves strengthening without adding multiple separate reinforcing members, thus avoiding excessive weight increase.
Solution Approach 2:
The side post serves multiple purposes simultaneously: it reinforces the pier panel area, reinforces the wainscot panel area, provides structural support for lateral bones to pass through, and creates load transmission paths. This multi-functionality allows a single component to address multiple strengthening needs without proportionally increasing weight.
2Strength
If the number of reinforcing members is increased to handle varying loads, then the strength with respect to head-on collision is improved, but the weight of the carbody increases
Solution Approach 1:
The bone structure is designed in advance with predetermined load transmission paths that engage during head-on collisions. The cutout portions, flange portions, and connecting relationships are pre-configured to automatically activate load-bearing functions when collision forces are applied, providing collision strength without requiring additional active reinforcing members.
Solution Approach 2:
The side post extends in the car upper-lower direction (vertical dimension) and provides connection points in multiple spatial dimensions. This three-dimensional structural arrangement creates efficient load transmission paths for head-on collision forces without requiring additional horizontal reinforcing members that would increase weight.
Data Source
AI summary
A bone structure of a railcar includes: a pair of first lateral bones arranged at an inner side of a wainscot panel in a car width direction and extending in a car longitudinal direction, the first lateral bones being joined to the wainscot panel; and a side post arranged at an inner side of a pier panel in the car width direction and extending in a car upper-lower direction, the side post intersecting with the first lateral bones, wherein the side post includes: at least one first flange portion joined to the pier panel; a pair of cutout portions located at positions corresponding to the wainscot panel, the first lateral bones passing through the respective cutout portions in the car longitudinal direction; and at least one second flange portion arranged between the first lateral bones and joined to the wainscot panel.