Abstract: Given the rapid development of hydrogen fuel cell heavy-duty trucks, reducing the weight and implementing lightweight design for hydrogen supply system frames has become particularly crucial. This paper designs and investigates a magnesium alloy hydrogen supply system frame by identifying the three-section cage-type welded structure of the steel hydrogen supply system frame. It adopts a design and assembly approach centered on bolted connections for the magnesium alloy hydrogen supply frame. By applying dimensional engineering analysis methods, it identifies three primary dimensional chains at critical connection joints, determines correct hole diameter values, and establishes a rational assembly sequence and methodology. This provides methods and ideas for the design and assembly of magnesium alloy hydrogen supply frames based on dimensional engineering.

Key words: dimensional engineering; magnesium alloy frame; hydrogen supply system; design ideas; assembly methods

摘要： 鉴于当前氢燃料重卡的快速发展，供氢系统的框架降重和轻量化设计变得尤为重要。 文章通过识别钢制供氢系统框架的三段式笼式焊接结构来设计和研究镁合金供氢系统框架， 采用以螺接为主的镁合金供氢框架的设计和装配思路，结合尺寸工程分析方法识别关键连接 接头的 3 条主要尺寸链条，设计正确的孔径值，制定合理的装配顺序和方法，为基于尺寸工 程的镁合金供氢框架设计和装配提供方法和思路。

关键词: 尺寸工程；镁合金框架；供氢系统；设计思路；装配方法