Automotive transmission belt is the important automotive engine parts, transmission belt is an important component. It can be said that the transmission belt of many technological advances and inventions, and is closely related to the development of the automotive industry, such as the V-belt invention, Trimming V-belt, the belt-ribbed belt and the rapid development of hydrogenated nitrile rubber (HNBR) used in timing belts, ethylene propylene diene monomer (EPDM) used ribbed belt, which are the latest technology in order to meet requirements of the automobile industry achieved rapid development.

     In recent years, global warming, environmental protection and comfort requirements of the automotive, energy, emissions and NVH (noise, vibration and smooth) is the main topic of the auto industry. How to improve fuel efficiency and reduce emissions, improve the maintenance cycle has been a goal of the automotive industry research, including multi-valve technology (Multivalve Engines, MVES) and variable Mun (Variable Valve Timing, VVT) technology, catalytic converters, 42 V power / starter motor integration (integrated starter alternator, ISA), DI diesel engines and 240,000 km or 300,000 km maintenance cycle. These technological advances to the performance requirements of automotive components has correspondingly increased and harsh, automotive transmission belt is no exception. In order to adapt to these changes, and some foreign manufacturers of the famous V-belt drive vehicle with a number of improvements and improve performance.

     Profile-ribbed belt

     Trimming ribbed belt tooth profile similar to the V-belt, cut in the profile of the wedge, to enhance flexibility of the band with heat and can, and can significantly increase belt life. Goodyear study, the same chloroprene rubber (CR) material ribbed belt, high temperature fatigue test ordinary ribbed belt 66 h, up to 167 h-ribbed belt teeth. A tooth-ribbed belt can reduce the assembly with the required precision. But in the tooth-ribbed belt pulley will be used by the air flow into the zone, a rhythmic acoustic flow. Goodyear company Helical, ultra-high (DAYCO) company caused irregular teeth to offset such voices can be reduced by about 15 dB noise about. The two companies were "Gatorhark" and "POLYCOG" marking to market.

     Flocking-ribbed belt

     One of the shortcomings of ribbed belt drive transmission is relatively noisy, low-speed or velocity changes in the use of faster, and after a period of time, wedge-wear, hardening and tension relaxation, or in the rain Tiandao water, transmission would be given harsh screams, the NVH performance of the vehicle. One solution is left wedge of 0.1-1.0 mm high-intensity short fiber (such as aramid, PBO fiber, etc.). Because fiber friction coefficient stability, a sound-absorbing function, thus greatly reducing the noise-ribbed belt drive.

     Flocking general with special ribbed belt grinding process to achieve. Grinding, rapid ground into a first wedge broad wedge, and then slow wet grinding, rubber Modiao, wedge-exposed certain length of the fiber.

     Flexible ribbed belt

     Flexibility for the earliest white-ribbed belt appliances such as washing machines, dry cleaning machines and fitness equipment. Principle is that, with the length of the perimeter of the round than the small band in the assembly, the use of special instruments mandatory tension in the fixed pulley, by the elastic deformation zone with sufficient force so that the tension. In the entire process without having to adjust the use of tension, tension that can be omitted regulating agencies.

     In recent years, small family car to simplify the engine front wheel drive annex of the structure using elastic ribbed belt as a belt drive. Flexibility in the use of general-ribbed belt elongation at break of more than 20 per cent of the high-twist nylon fiber layer as a strong cord. Particularly high, the mainland (CONTITECH) production car with elastic ribbed belt, allegedly reached 150,000 km life.

     EPDM-ribbed belt

     In recent years, the engine room temperature getting higher and higher, some pieces of rubber capability requirements 150 ¡æ, and instantly the capability 170 ¡æ, the traditional chloroprene rubber (CR) is. As HNBR too expensive, people in the study found that a small amount of oil is not on the front of the belt, causing engine damage can use the cheaper good heat resistance EPDM rubber (EPDM), as the main rubber-ribbed belt material. But EPDM wear resistance, high temperature slitting-resistant and dynamic performance is not satisfactory, poor adhesion with other materials, which are modified as needed or add ZDA ZDMA and with other materials and used to solve the problem.
    EPDM-ribbed belt high temperature performance and high temperature fatigue life markedly improved, such as CR 107 ¡æ ribbed belt under fatigue life of only 50 h, and EPDM 121 ¡æ ribbed belt in the fatigue life of up to 125 h. EPDM development of the mainland reached 240,000 Km-ribbed belt life.

     Short fiber reinforced belt

     HNBR first since the 1975 publication of the patents, HNBR is becoming the world's first production car belt standards elastomer material. Japan HONDA first company in 1985 to produce HNBR equipped with a substrate for the production of a new type of automobile transmission belt. Germany BWM had also adopted in 1997, imports from Japan and the European HNBR timing belt is the first Decoration HNBR timing belt automobile manufacturers. In the late 1990s, the rapid development of the world automobile industry, the intense market competition, automobile manufacturers have adopted ways to extend the maximum camshaft drive belt to improve the life of the car's engine performance, at present, almost all the world Automobile manufacturers are synchronized through the use of HNBR brought to the vehicle's product quality. Practice has proved that, in general driving conditions of the working life HNBR timing belt up 100000-150000 km.

     Modern cars on the belt requirement is: Life of 250000-300000 km; temperature -35-150%, instantaneous temperature can reach 175%; oil of ¡Ý CR; 150 ¡æ step down up to 3000 h-life, but also in enhancing oil not at the expense of its low-temperature performance, with teeth dynamic storage modulus ¡Ý 1.4 MPa. To achieve such a high, and only the use of peroxide curing HNBR / zinc methacrylate (ZMA) complexes and aramid fiber reinforced composite materials.

     Mainland companies HNBR / ZMA and aramid fiber with manufacturing HSN-POWER life HNBR timing belt use in the gasoline engine, their life expectancy has more than 240,000 km, and has been close to the "engine with life".

     A cloth belt back

     Automotive belt because of the manufacturing process constraints, with the back are generally pure rubber, as it is used in the automotive belt back at the same time lead to other components such as pumps and tension institutions, in particular the DI diesel engines. Requires a lot of tension, so wear on the back, very large, pure rubber unable to meet the requirement. If the cause is back with the cloth, can be greatly enhanced with the back wearability. If the mainland's "Conti Diesel Runner" is such a belt structure.

     Oil belt

     Since the 1960s, the United States GM will be the first time the belt for the new roof standard cam (OHC) engine alternative use of the original ball chain, as a result of a synchronous belt, and noise, without lubrication, light weight , low cost and easy maintenance, and many other advantages, and rapidly when the car engine is the use of transmission, especially small engines, accounting for almost 100 per cent. But the new century, as modern car engine enhanced degree of constant improvement of stricter emissions regulations constantly, constantly extended maintenance cycle (240,000 km or 300,000 km), when the transmission is the continuously increasing load, with the precision of gas is there are increasingly high requirements, timing belt has been increasingly difficult to meet the modern car engine harsh demands, coupled with the improvement of technology are chain such as strength, wear resistance, noise reduction and optimization of design, a chain themselves to overcome the shortcomings highlighted Power transmission chain, the need to safeguard and heat resistance, oil resistance, and other inherent advantages, in recent years when the car engine is a transmission mechanism is inclined to use chain trend.

     In order to compete with the chain, in recent years foreign manufacturers such as transmission belt mainland, Gates and the development of the special Higher oil belt, chain belt can be the same as direct contact with lubricants, omitting tensioner and guide with tension and a guide, this can reduce the friction coefficient with 30% more compact structure with space.

     Oil belt transmission belt is a major breakthrough in technology have changed the transmission belt with the mineral oil can not contact traditional values.
     You need to use with its formula of high-acrylonitrile content HNBR, tooth plastic coated cloth Branch to contain a large number of Teflon, strength of high-strength cord to use fiberglass or carbon fiber composites.

     "" Word tooth

     "" Tooth similar to the word "person"-gear, the biggest advantages is to reduce noise transmission capacity and life has greatly improved. Such a Goodyear is the invention of the 1990s, and in the "ENGLE" marking to market. "" Word tooth successful development, the historical development of the belt of a milestone significance. The band with the same profile than straight tooth, noise can be reduced by 10 to 26 dB, 120% increase service life, the ability to drive substantial increase (or decrease bandwidth). In the automotive test, life has been more than 210,000 km.

     Non-circular pulley drive technology

     Automotive engines are now commonly used by the system and multi-valve variable valve timing technology, which camshaft to the pulse load multiplied, resulting in engine vibration rate increase, affecting vehicle NVH (noise, vibration and smooth) performance, but also on synchronization Tape and other parts damage. In order to maximize low offset this vibration, Leiden (Litens) SmartSprocketTM company invented the non-circular gear technology (CTCcamshaft torque cancellation tech-nology) (Figure 8), which, cam pulley instead of the traditional pure circular, but elliptical or other non-round. In the course of this operation can be offset most of the amplitude, with a 40% reduction in the force and its components, saving and life-enhancing fuel consumption.

     Modular and integrated transmission system

     The so-called modular transmission is the transmission belt is when (including transmission of the band, round bodies and tension) and the front-end engine auxiliary drive system (in addition to transmission of the drive also includes generators, air conditioning, water pumps, etc.) integrated in the together, users can be assembled to meet the intensive car production now, the complex production process simplified. Gates has developed a system that GEMl0TM yes.

     Gates, the company has also developed an integrated auxiliary drive system (Electro-Mechanical Drive, EMD), and adapted to 14 V/42V electrical systems, life has reached 240,000 and 500,000 km of the start number. The system has been in the Peugeot, GM and other new development of 42 V power / starter system applications.

     Composite V-belt CVT

     CVT institutions (CVT) is the ideal vehicle speed, and its traditional automatic transmission gears and hydraulic institutions (A / T) different, there is a pulley and the belt CVT institutions. CVT auto transmission be in two forms: friction transmission and traction drive, including the former wet rubbing metal belt, dry friction rubber V-belts and V-belt of the latter recently on the CVT.

     Friction drive CVT transmission belt use is the original metal belts. Metal belts in the lubricants used in the need for greater impetus to the pulley, which will reduce the total efficiency drive.

     Instead of rubber V-belt or not, and the rubber V-belt than metal belt manufacturing low-cost, and maintenance are easy to use, and therefore become targets of research and development of competing manufacturers.

     But car speed V-belt use to convey the high torque, general rubber V-belt failed. If 1000 ml maximum torque of the engine, the V-belt must be able to withstand the lateral pressure of 2.0 MPa, and the general V-belt can only 0.4-0.5 MPa. To achieve such a high modulus, tension can only be used by the rubber layer (tension belt) and metal composite block (block) with a compound V to achieve such a high demand.

     CVT Composite V-belt almost all of the world's famous drive Daihan in research and development, a transmission belt cutting-edge technology, this is not only the transmission belt of technical difficulty, but this is a market with the prospects are very bright. Whether in the car and have a wide range of other industrial uses.

     Composite V-belt abroad has reached a practical level, such as machinery companies in Aichi, Japan and East Sakamoto jointly developed CVT system installed in the car, Suzuki Mira car. Samsung, Gates, Goodyear, and the mainland and in the development of higher special this band.