关键词: 尺寸工程；镁合金框架；供氢系统；设计思路；装配方法

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