Rolling Stock Side Post Joint Structure for Underframe
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Solution Overview
Problem
The existing joint structure between side posts and underframe in rolling stocks with a lower-side narrowed shape is prone to deformation and damage under external forces, as the lower end portions of the side posts do not securely intersect with the side beams, leading to inadequate protection of the passenger compartment.
Innovation Solution
A rolling stock design featuring Z-shaped side beams with projecting pieces and joint members that securely join the inclined lower end portions of side posts to the underframe, enhancing the joint strength and stability through specific fixation plates and joint members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lower end portions of side posts are joined to side beams using a simple abutment structure, then the manufacturing process is simple, but the joint strength is insufficient and the side structure deforms under external forces
Solution Approach 1:
The patent introduces rocker rails as intermediary components between the side posts and side beams. The rocker rails serve as mediators that receive the lower end portions of the inclined side posts and transfer the loads to the side beams, providing a reliable joint structure that maintains both manufacturing simplicity and adequate joint strength.
Solution Approach 2:
The patent employs Z-shaped side beams with projecting pieces that extend in multiple dimensions. The side beams have a base plate portion, a lower projecting piece, and an upper projecting piece, creating a three-dimensional joint structure that enhances load distribution and joint strength while accommodating the inclined side posts.
2Strength
If the side posts are bent to join with side beams, then the joint strength is improved, but the number of processing steps increases and processing accuracy becomes difficult to secure
Solution Approach 1:
The side posts are pre-formed with inclined lower end portions during the manufacturing process, so that when they are joined to the Z-shaped side beams, the joints can be made directly without requiring additional bending operations. This preliminary shaping of the side posts simplifies the assembly process while maintaining the necessary geometric configuration for strong joints.
3Volume of moving object
If the car body width is increased by fully utilizing the rolling stock gauge, then the passenger compartment space is improved, but the lower portion of the car body comes close to the platform requiring a lower-side narrowed structure
Solution Approach 1:
The patent employs asymmetric side post configurations where the lower end portions of the side posts are inclined toward the inside of the car body. This asymmetric arrangement allows the car body to achieve maximum width at the upper portion for passenger comfort while narrowing at the lower portion to accommodate the platform, creating an optimized width profile that satisfies both requirements.
Data Source
AI summary
Provided is a rolling stock having a car body formed by joining side structures to an underframe, end structures, and a roof structure, the side structures having lower portions inclined toward an inside of the car body, the rolling stock having a structure allowing lower end portions of side posts of the side structures and side beams of the underframe to be securely joined. Side beams 21 in an underframe 20 of a rolling stock and lower end portions of side posts 31 having lower portions inclined toward an inside of a car body are joined by means of joint members 71. Each joint member 71 has a side-beam fixation plate portion fixed to an outer face of the side beam and a side-post fixation plate portion fixed to a side face of a lower end portion of the side post.