High-Pressure Gas Tank Cap Threading to Prevent Radial Deformation
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Solution Overview
Problem
The existing fixing structure for high-pressure gas tanks, which uses bolts to fasten a metal fixing bracket to a cap, causes radial deformation of the cap due to the fastening force, compromising the tank's integrity.
Innovation Solution
A threaded connection between a cap and a protective member made of resin and metal, where the fastening force acts in the axial direction, eliminating the need for bolts and preventing cap deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bolts are used to fix the protective member to the cap, then the protective member can be securely fastened, but the cap deforms in the radial direction due to the fastening force
Solution Approach 1:
Instead of using bolts that apply radial fastening force to the cap, the invention inverts the approach by using a threaded connection where the protective member's connecting portion threads directly into the cap's shaft portion. This reverses the force application mechanism, allowing the fastening force to act axially along the shaft portion rather than radially on the cap, thereby preventing cap deformation while maintaining secure fastening.
2Strength
If bolts and fixing brackets are used to attach the protective member, then the connection is strong, but the device complexity increases due to additional fastening members
Solution Approach 1:
The invention merges the protective member and the fastening function into a single integrated structure. The connecting portion of the protective member includes a female threaded portion that directly threads into the male threaded portion of the cap's shaft portion. This combines the protective function and the fastening function into one component, eliminating the need for separate bolts and fixing brackets, thereby reducing device complexity while maintaining connection strength.
Solution Approach 2:
The invention extracts the fastening function from separate bolt components and integrates it directly into the protective member structure. By incorporating the female threaded portion within the connecting portion of the protective member, the fastening capability is extracted from external fasteners and built into the protective member itself, simplifying the overall assembly.
3Reliability
If multiple bolts are used to secure the protective member, then the fastening is reliable, but the assembly time increases
Solution Approach 1:
The invention segments the fastening function into the threaded portions integrated into the protective member and cap, allowing for a simpler, more direct assembly process. The male and female threaded portions are pre-formed as integral parts of the respective components, enabling straightforward screwing together without the need to manually assemble multiple bolt components, thereby reducing assembly time while maintaining fastening reliability through the threaded connection.
Data Source
AI summary
A high-pressure gas tank includes: a tank body including a body portion and a dome portion disposed on one side of the body portion in the axial direction; a cap having a shaft portion extending from a central portion of the dome portion along the axial direction and a through-hole through which the gas flows through the shaft portion; and a protective member that includes a protective portion covering the dome portion around the cap and made of resin and a connecting portion integrated with the protective portion, having an annular shape or a tubular shape into which the shaft portion of the cap is inserted, and made of metal. The cap includes a first threaded portion on an outer periphery of the shaft portion, and the protective member includes a second threaded portion screwed to the first threaded portion on an inner periphery of the connecting portion.