The ability of gasoline tricycles to operate stably for extended periods in complex urban and rural conditions relies fundamentally on a scientifically sound selection and combination of materials.The main materials encompass the frame structure, body panels, load-bearing components, and functional accessories. A balance is struck between strength, corrosion resistance, machinability, and cost control to meet the dual requirements of reliability and economy in grassroots transportation.
The frame is the core load-bearing structure of the entire vehicle, generally using high-quality carbon structural steel or low-alloy high-strength steel, with plate thicknesses typically between 2.5mm and 5mm. This type of steel possesses excellent tensile, compressive, and torsional strength, maintaining shape stability under full load and impact, preventing plastic deformation or fatigue cracking. Welding processes primarily employ carbon dioxide gas shielded welding or arc welding, requiring uniform and dense welds to ensure continuous force transmission and overall rigidity. To further enhance weather resistance, the frame surface often undergoes hot-dip galvanizing or epoxy primer followed by powder coating for double protection, effectively resisting rainwater, mud, and salt spray corrosion.
The cab cover and frame are mostly made of cold-rolled steel or galvanized steel. Cold-rolled steel offers good formability and low cost, making it suitable for non-enclosed structures such as flatbeds and sideboards; galvanized steel significantly slows down corrosion in humid or high-salt environments. Some high-end or passenger vehicle models incorporate fiberglass reinforced plastic (FRP) in the cab front bulkhead and doors, utilizing its lightweight, high strength, and high design flexibility to achieve a streamlined appearance and corrosion resistance, but must also consider impact resistance and heat aging resistance.
Load-bearing components such as the cargo box floor commonly use patterned steel or anti-slip aluminum. Patterned steel uses low-carbon steel as the base material, with a surface pressed into diamond or lentil-shaped embossed patterns to increase friction and prevent cargo from slipping during transport. Aluminum, with its low density and corrosion resistance, is used in applications requiring high lightweighting and rust prevention, but its rigidity needs to be compensated for with reinforcing ribs. Sideboard frames and connectors are mostly made of shaped steel (channel steel, square tubing), which is welded or bolted after rust prevention treatment to ensure structural stability and ease of maintenance and replacement.
The materials used in the running gear system directly impact durability and grip. Wheel rims are typically made of carbon steel or aluminum alloy; carbon steel offers high strength and low cost, making it suitable for heavy-duty conditions, while aluminum alloy is lightweight and dissipates heat well, improving high-speed stability. Tires are made of rubber composite materials, with tread patterns designed according to their intended use. Deep treads enhance grip on unpaved roads, while shallow treads optimize wear resistance and quietness for on-road driving. Suspension springs often use spring steel such as 60Si2Mn, possessing excellent elastic limits and fatigue resistance, allowing them to withstand repeated loads over extended periods.
Functional accessories, such as fuel tanks, are commonly injection-molded from nickel-plated steel or high-density polyethylene (HDPE). Steel fuel tanks offer high strength and excellent sealing, complemented by an internal anti-corrosion coating to prevent fuel corrosion; HDPE fuel tanks are acid and alkali resistant, lightweight, and their one-piece molding reduces the risk of weld leaks. Exhaust pipes are typically made of stainless steel or heat-resistant cast iron. Stainless steel offers superior resistance to rust and high-temperature oxidation, while cast iron is more stable under high temperature and pressure, ensuring smooth exhaust and low noise.
In summary, the main material system of gasoline tricycles uses steel as the core framework, supplemented by surface treatments such as galvanizing and powder coating to improve weather resistance. Aluminum, fiberglass, and polymer materials are also incorporated in certain areas to meet requirements for lightweighting, corrosion resistance, and functionality. This material combination ensures structural strength and service life while also balancing manufacturing costs and ease of maintenance, laying a solid foundation for the reliable operation of the vehicle in various terrains.
