High Pressure Tank Cap Liner Screw Stability During Filament Winding

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Solution Overview

Problem

High pressure tanks for fuel cell vehicles face quality degradation due to loosening or tightening of the cap and liner during high-speed filament winding, which increases manufacturing time and costs.

Innovation Solution

A connecting member is strategically placed to straddle over the liner and cap, restricting relative rotation and maintaining a stable screw-engaged state during the winding process, ensuring a suitable reinforcing layer formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the winding speed of fiber reinforced resin is increased to shorten manufacturing time, then productivity is improved, but the screw-engagement between cap and liner becomes loosened or tightened degrading product quality

Engineering Contradiction:
Improvewinding speedVSAvoidscrew-engagement stability
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

A connecting member is introduced as an intermediary element between the cap and liner. This connecting member includes a first engagement portion that engages with the cap and a second engagement portion that engages with the liner, thereby mediating the connection and preventing direct relative rotation between the cap and liner during high-speed winding operations

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The connecting member is arranged in advance before the winding process begins. By pre-establishing this intermediate connection structure, the system is prepared to prevent loosening or tightening of the screw-engagement before the high-speed winding starts, ensuring stability throughout the manufacturing process

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentUS11391414B2High pressure tank and manufacturing method therefor
Publication Date: 2022.07.19 HONDA MOTOR CO LTD
  • US11391414B2 patent drawing
  • US11391414B2 patent drawing
  • US11391414B2 patent drawing

AI summary

A high pressure tank is equipped with a liner, a reinforcing layer laminated on an outer surface of the liner, and a cap joined to the liner and having a flow path through which a gas is capable of flowing. The liner and the cap are joined to each other by screw-engagement, and a connecting member (plate-shaped members, annular member) is disposed so as to straddle over the liner and the cap.