Vehicle Shield Shell Fastening Structure to Prevent Bolt Rotation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The conventional shield structure's protruding portion has low strength in the direction of rotation around the bolt, leading to deformation and displacement of the shield shell, making it difficult to fix accurately on the vehicle body target portion.
Innovation Solution
A shield structure with a shield shell that includes a tubular shell body and a vehicle body fastened portion with a plate shape, featuring a bolt hole and contact surfaces that engage with the target portion's inner surfaces, allowing for secure fastening and restricted rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a protruding portion is used to engage with a step portion for fixing the shield shell, then the shield shell can be fastened to the target portion, but the protruding portion has low strength in the direction of rotation and deforms under rotational force
Solution Approach 1:
The vehicle body fastened portion is divided into multiple functional elements: a flat plate portion for positioning, a protruding portion for engagement, and contact surfaces for rotational restriction. This segmentation allows each element to perform its specific function optimally, with the contact surfaces providing rotational stability that the protruding portion alone cannot achieve.
Solution Approach 2:
The invention adds contact surfaces that extend in a direction orthogonal to the axial direction of the shell body. These contact surfaces provide rotational restriction by contacting inner surfaces of the target portion, adding a new dimensional constraint that prevents rotation without requiring the protruding portion to bear rotational loads.
2Stability of the object's composition
If the protruding portion is bent to engage with the step portion, then rotation of the shield shell is restricted, but the protruding portion deforms and the shield shell displaces from the appropriate position
Solution Approach 1:
The flat plate portion is designed to contact the overlapped surface of the target portion beforehand, establishing a stable positioning base before the protruding portion engages with the step portion. This pre-positioning prevents displacement and ensures accurate alignment during the fastening process.
Solution Approach 2:
The contact surfaces act as intermediaries between the vehicle body fastened portion and the target portion's inner surfaces. These contact surfaces transmit and distribute forces, preventing direct stress concentration on the protruding portion and reducing deformation while maintaining rotational stability.
3Reliability
If the shield shell is fastened using a bolt through the protruding portion, then the shield shell is fixed to the target portion, but it is difficult to fix the shield shell in an appropriate position due to deformation
Solution Approach 1:
The flat plate portion and contact surfaces are designed to establish positioning and rotational constraints before the bolt is fully tightened. This preliminary action ensures the shield shell is correctly positioned and oriented, allowing for precise fixing without deformation affecting the final position accuracy.
Solution Approach 2:
The invention changes the structural parameters of the vehicle body fastened portion by adding contact surfaces with specific orientations and positions. These parameter changes create multiple constraint points that work together to maintain both reliability of fixation and precision of positioning, distributing stresses away from the protruding portion.
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 solution effectively restricts the rotation of the shield shell while improving the accuracy of the fixing position on the vehicle body target portion, eliminating the need for a protruding portion and reducing material costs.
Implementation Method 1
a deep drawing step of forming a deep-drawn material by applying a cylindrical deep drawing process to a metal sheet
Implementation Method 2
a collar-shaped portion producing step of applying a punching process to the deep-drawn material and thus forming a collar-shaped portion
Implementation Method 3
a step producing step of forming a step by bending the collar-shaped portion at a location thereof which is spaced from the tubular portion
Data Source
AI summary
A shield structure includes: a shield shell including at least one wall and defining a shielded space, and a vehicle body fastened portion which is continuous with the one wall via a step and configured to be fastened to a target portion, wherein the target portion includes an overlapped surface and a pair of inner surfaces, the overlapped surface being configured to be overlapped with the vehicle body fastened portion, wherein the inner surfaces extends upright from the overlapped surface and opposed to each other, wherein the vehicle body fastened portion includes a pair of contact surfaces on end faces of a plate-shape fastened portion body and is able to come into contact with the inner surfaces, and wherein the contact surfaces is configured to be in contact with the inner surfaces in an overlapped state of the fastened portion body which is overlapped with the overlapped surface.