Automobile pipelines are mainly composed of hoses, copp […]
Automobile pipelines are mainly composed of hoses, copper pipes and aluminum pipes, which are responsible for the transfer of oil, water, gas and hydraulic forces. Among them, the number of hoses is large and it is an important part of the automobile. The difference between the automobile hose and the metal tube is that the hose is a flexible object, which is cut according to the length, simple in prefabrication, variable in shape, easy in assembly, but easy to age and not durable; the metal tube is a rigid object and has to be fixed in advance. The prefabrication is complicated and the assembly cost is relatively large, but it is reliable and durable. In the car, air hoses, cooling, power steering and other places use hoses, while the fuel and brake parts use metal pipes, and some use hoses.
The main material of the automobile hose is generally made of nitrile butadiene rubber, neoprene rubber, polyacrylate rubber, ethylene propylene rubber, hydrogenated nitrile rubber, chlorosulfurized polyethylene, chlorinated polyethylene, and the like. The hose requires a wide range of environmental temperature adaptation. It should be used normally from -20 degrees to +120 degrees. It has corrosion resistance and has certain hardness and tensile strength. Therefore, the automobile hose has the skeleton material such as the maintenance wheel and the polyester cord. .
Although the automobile hose structures for different purposes are different, they are generally divided into three basic parts: the inner layer, the reinforcing layer and the outer layer. The inner layer is the layer where the hose directly contacts the working medium, plays the role of sealing and diversion. It should have a certain thickness and can withstand temperature, corrosion and friction. The reinforcing layer is the part of the hose that is under pressure and has considerable rigidity and strength to protect the hose structure. The outer layer is a protective layer of the hose, which has a defensive effect on the outside world, and should have a certain thickness, and can withstand temperature, corrosion resistance, wear resistance and aging resistance. Divided from the use, automotive hoses are divided into low-pressure pipes, high-pressure pipes and oil-resistant pipes. Low-pressure pipes are mainly used in cooling systems. High-pressure pipes are used in brake hydraulic systems and other pressurized working environments. Oil-resistant pipes are used in fuel supply systems.
Open the engine compartment, common cooling water hose, steering power hose, air conditioning hose and vacuum hose, as well as invisible brake hose, automatic transmission coolant hose, etc., the use is different, the working medium is different, the material and manufacture of automobile hose The craftsmanships are also very different, so they are “all in their own roles” and cannot be confused.
For example, brake hoses and air-conditioning hoses are multi-layered structures from the cross-section, but their materials and manufacturing processes can vary greatly. The inner and outer layers of the brake hose are made of ethylene propylene rubber. The reinforcing layer is made of polyester, polyvinyl alcohol or glass fiber. It focuses on strengthening and pressure resistance and is suitable for brake oil medium. The air conditioning hose is not only made of ethylene propylene rubber, but also Highly airtight materials are used to adjust the optimum formulation as the inner layer material for high permeability media. Because air-conditioning refrigerant is a highly permeable medium, the general structure of the hose material cannot prevent the penetration of air-conditioning refrigerant.