1, the engine connecting rod
Titanium alloy is the ideal choice of the connecting rod materials.Made of titanium alloy engine connecting rod can effectively reduce the engine quality, improve fuel efficiency and reduce the displacement.Compared with steel rods, titanium rod can reduce the quality of 15% ~ 20%.The application of titanium alloy connecting rod in Italy's first new ferrari car 3.5 LV8 and Acura NSX reflected on the engine.Materials mainly used in the titanium alloy connecting rod have Ti 6 al 4 V, Ti, fe - 10 V - 2-3 al, Ti - 3 - al - 2.0 V and Ti - 4 4 mo - n - 0.5 S I S, etc., other materials such as titanium alloy al Ti - 4-2 S I - 4 mn and Ti - 7 m - 4 mo also in research and development in the application of the connecting rod.
2, engine valve
Made of titanium alloy automobile engine valve, not only can reduce the quality, prolong service life, and can reduce fuel consumption and improve the reliability of the car.Titanium valve compared with steel valve, quality can be reduced by 30% ~ 40%, hair motive limit speed can be increased by 20%.In terms of the present application, the inlet valve of the material is given priority to with Ti - 6 a l - 4 v, the exhaust valve material is given priority to with Ti - 6242 - s, Sn and Al are added together, usually can get lower brittleness and high strength;Mo addition can improve the performance of heat treatment on the titanium alloy, the strength of the quenching and aging of titanium alloy, at the same time increase the hardness.Other potential of titanium alloy are:
3, the valve spring seat
High strength and fatigue resistance is the performance of the valve spring seat must have the beta type for heat treatment alloy, titanium alloy by solid solution aging treatment for high strength, is suitable for the corresponding materials have 15 v, Ti - 3 cr - 3, 3 sn and Ti 15 mo - 3 - al - 2.7 Nb - 0.2 - Si.Mitsubishi motors used on the large-scale production car Ti al - 22 v - 4, the titanium alloy valve spring seat is reduced 42%, the quality of the original steel lock valve mechanism to reduce as much as 6% of the inertial mass, the largest engine speed increased by 300 r/min.
4, titanium alloy spring
Titanium and its alloy steel material has a relatively low modulus of elasticity, sigma s/E value is large, suitable for making elastic element.Compared with steel spring car, in the same elastic work under the premise of titanium spring height was only about 40% of steel spring, the quality is only 30% ~ 40% of steel spring, is advantageous for the car body design.In addition, the titanium alloy excellent fatigue performance and corrosion resistance can improve the service life of the spring.Currently, can be used to make cars with the titanium alloy material with the spring Fe6.8 Mo Ti - 4.5-1.5 - Al and Ti - 13 v11c - 3 Al etc.
5, the turbocharger
Wheel vortex supercharger can improve the combustion efficiency of the engine and increase engine power and torque.Turbocharger turbine rotor need to work for a long time in more than 850 ℃ high temperature exhaust gas, so demand has very good heat resistance.Conventional light metals such as aluminum alloy, because of the low melting point and cannot be used.Although the ceramic materials for light weight and high temperature resistance and has been applied in the turbine rotor, but due to the high cost and the shape optimization and its application may be limited.In order to solve these problems, Tetsui and others developed TiAl turbine rotor, after many test, it not only has good durability and efficiency, but also can improve the engine acceleration.The design has been successful in Mitsubishi Lancer Evolution series models obtained commercial applications.
6, exhaust system and the muffler
Titanium heavy usage in the automobile exhaust system.Made of titanium and its alloys exhaust system, not only can improve the reliability, prolong life and improve the appearance, also can reduce the quality and improve the efficiency of fuel combustion.Titanium exhaust system compared with steel exhaust system, the quality can reduce about 40%.In Go1f series cars, titanium can reduce exhaust system quality 7 ~ 9 kg, the exhaust system USES titanium main current of industrial pure titanium.
Titanium muffler quality only 5 ~ 6 kg, lighter than stainless steel muffler.2000 Chevrolet CorvetteZ06 cars with a 11.8 kg of titanium muffler and tail pipe system was used to replace the 20 kg stainless steel, quality to reduce by 41%.After the replacement system the same intensity, and make the car faster, more flexible operation and save fuel.Muffler used titanium also mainly of industrial pure titanium.
7, the framework of the body parts
In order to improve the security and reliability of the car, need from the aspects of design and manufacturing, especially considering manufacturing materials.Titanium is a kind of good material used to make car body frame, it not only higher than strength, but also has good toughness.In Japan, car manufacturers choose pure titanium metal welding control body framework, this framework can make drivers have enough sense of security while driving.
8, other titanium alloy parts
In addition to the above several parts, titanium is used in the engine rocker arm, suspension spring, engine piston pin, automotive fasteners, hanging ear nut, automotive door into beam, the retaining bracket, brake caliper pistons, pin plug, pressure plate, the variable speed button and the automobile clutch disc and so on car parts.
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