Railcar Bodyshell Overlapping Frame Design
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Solution Overview
Problem
The existing railcar bodyshell design results in a reduction of interior space due to thick outside plate panels, restricts the arrangement and attachment of installed properties like seats, and increases manufacturing costs due to the use of joint members for coupling vertical and horizontal posts.
Innovation Solution
A railcar bodyshell design featuring first and second frames with overlapping plate-shaped head portions, allowing for a thinner outside plate panel and eliminating the need for joint members, enabling easier attachment of installed properties and reducing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vertical posts are directly disposed on horizontal posts, then the structural strength is improved, but the outside plate panel thickness increases and railcar interior space is reduced
Solution Approach 1:
The invention transitions from a direct vertical stacking arrangement (one-dimensional thickness accumulation) to an overlapping arrangement where the second head portion is positioned at an angle relative to the first head portion. This dimensional change allows the frame structure to maintain strength while reducing the thickness direction occupation, thereby preserving railcar interior space.
2Stability of the object's composition
If vertical posts are arranged on horizontal posts, then the structural stability is improved, but the head surfaces of horizontal posts become non-flat and attachment of installed properties is restricted
Solution Approach 1:
The invention applies local quality by making the head surfaces of the horizontal posts flat in specific areas where installed properties need to be attached. The overlapping arrangement of frame head portions creates flat surface zones that maintain structural stability while providing suitable attachment surfaces for seats and other installed properties.
3Reliability
If joint members are used to couple vertical and horizontal posts, then the structural reliability is improved, but the number of parts increases and manufacturing cost increases
Solution Approach 1:
The invention merges the coupling function into the frame structure itself by using the overlapping arrangement of head portions. Instead of separate joint members, the frames are designed to overlap and connect directly, integrating the coupling function into the main structural components. This reduces the number of parts while maintaining structural reliability through the overlapping connection design.
Data Source
AI summary
The present invention includes: an outside plate; first frames each including a first head portion; and second frames each including a second head portion and arranged perpendicular to the first frames. At each of portions where the first frames and the second frames intersect with each other, the second head portion is arranged on the first head portion so as to overlap the first head portion.