Hubei Yingma Automobile Technology Co., Ltd.'s automotive rubber hoses can be divided into multiple categories based on differences in application systems, working pressure, transmission media, and materials. The structure, process, and performance standards vary significantly across different categories. Currently, the mainstream industry classification centers on vehicle application systems, covering six core categories: fuel, cooling, braking, air conditioning, power steering, and intake supercharging, meeting the full-scenario needs of vehicle operation.

I. Fuel System Rubber Hoses

As a core component of fuel delivery, they are mainly used to connect the fuel tank, fuel pump, and engine fuel injection system, responsible for transmitting gasoline, diesel, and new biofuels. This type of hose mostly uses Nitrile rubber (NBR) and Neoprene (CR) materials, possessing strong hydrocarbon corrosion resistance and anti-permeation capabilities, effectively preventing fuel evaporation and leakage. They are divided into high-pressure fuel hoses and low-pressure fuel hoses. The high-pressure type adapts to the engine's high-pressure fuel supply conditions, while the low-pressure type is mostly used for fuel tank ventilation and return lines. They are core hoses exclusive to fuel vehicles.

II. Cooling System Rubber Hoses

Cooling system hoses currently hold a high market share among automotive hose categories. They are mainly used for coolant delivery in engines and power batteries, connecting components such as the radiator, water pump, heater, and others to maintain the constant temperature operation of core vehicle components. Mainstream materials include EPDM rubber and silicone, featuring excellent high-temperature resistance, low-temperature resistance, and aging resistance, capable of withstanding temperature differences ranging from -40°C to 150°C for a long time. With the popularization of new energy vehicles, the demand for power battery cooling hoses has grown significantly, becoming a core incremental category in the industry.

III. Braking System Rubber Hoses

As a core safety component of the vehicle, they connect the brake master cylinder, wheel cylinders, and brake lines, transmitting brake fluid and enduring high-intensity pulse pressure. This type of hose features a high-pressure multi-layer structure: the inner layer is resistant to brake fluid corrosion, the middle layer is fiber-woven to enhance pressure bearing capacity, and the outer layer is wear-resistant and aging-resistant. Their pressure resistance, explosion-proof, and tensile resistance performances are stringent, preventing expansion, rupture, and leakage of brake lines. They are directly related to vehicle braking safety and are the hose category subject to the strictest quality inspection by automakers.

IV. Air Conditioning System Rubber Hoses

Used in automotive air conditioning lines to transmit refrigerants and refrigeration oil, they are divided into high-pressure hoses and low-pressure hoses, adapting to the air conditioning refrigeration cycle system. They adopt a special rubber composite structure, combining sealing properties, high and low-pressure resistance, and anti-refrigerant permeability characteristics. They can adapt to frequent pressure changes in the air conditioning system while resisting high temperatures in the engine compartment and outdoor UV aging, ensuring stable air conditioning cooling effects and preventing refrigerant leakage failure.

V. Power Steering System Hoses

Suitable for hydraulic power steering vehicles, they transmit power steering fluid. They are divided into high-pressure inlet hoses and low-pressure return hoses, bearing dynamic high-pressure impacts during the steering process. The hoses possess high elasticity, impulse pressure resistance, oil resistance, and wear resistance, capable of cushioning steering vibrations, ensuring a smooth steering feel, and preventing steering lag and power assistance failure.

VI. Intake and Supercharging System Hoses

Mainly used in turbocharged models and new energy intake heat dissipation systems, including intake hoses and intercooler hoses, they are responsible for conveying air and dissipating heat from the intake. Most use reinforced silicone materials, featuring high-temperature resistance, deformation resistance, and high flexibility. They can adapt to the high-temperature and high-pressure conditions of turbocharging systems, preventing hose collapse and air leakage, ensuring stable engine intake efficiency and power output.