Engineering machinery fittings mainly motivated components and transmission components, hydraulic components and electrical components, etc. Current engineering machinery power element basically all use internal combustion diesel engine (diesel); Drive mechanical drive, hydraulic mechanical transmission, the static hydraulic transmission, electrical transmission, etc. But at the moment, engineering machinery use most frequently, the most common for hydraulic mechanical transmission and the static hydraulic transmission. The whole transmission system also includes transmission and drive axle. Hydrostatic transmission has a variety of structural forms, some of them have a drive axle, transmission shaft, some did not, as the case may be; Hydraulic components mainly include tanks, pumps, valves, seals and hydraulic accessories, etc.Static hydraulic components (mainly variable pump), motor (variable and quantitative), and the corresponding speed reducer, etc.; Electrical components used in engineering machinery is not big, the influence of the earliest engineering mechanical and electrical systems, mainly is the starting circuit and the lighting circuit, system and components are very simple, starting drag can be used starting, work without lighting during the day, therefore, the two circuits is a fault in the system can keep working.But until today in development of engineering machinery, electrical systems and electrical components has become a critical part of the construction machinery, it's safe to say today the vast majority of construction machinery, is a fault in the electrical system won't work, some even work is equal to a pile of scrap. So the electrical system, electrical components at present is also the most key engineering machinery is one of the main parts. Main electric components in addition to the traditional element, along with a variety of sensors, all kinds of control components and microprocessor, and so on. Here are the international engineering machinery fittings mainly the basic situation and development trend about.
　　1. The basic situation of foreign engineering machinery mainly accessories
　　Now foreign engineering machinery accessories and most of them are main production has a long history and mature technology, supply adequate, high concentration, brand effect is prominent. Accessories and developed along with the development of the host, at the same time, the development of fittings itself, in turn, promote the development of the host. At present, the development of the foreign engineering machinery accessories situation better than the host.
　　1.1 at present, the development of the foreign engineering machinery accessories situation is better
　　Engineering machinery abroad in recent years there is a kind of development trend, the host manufacturing enterprises to develop in the direction of assembly enterprises gradually, the fittings provided by the supplier to step by step. Host, such as the world's most powerful manufacturers in the United States Caterpillar (Caterpillar), Case (Case), Japan's Komatsu (Komatsu), Sweden's Volvo (Volvo), these host large engineering machinery manufacturing enterprises in the world, its accessories and supporting ability is very strong, their accessories and outside match is also substantially increase year by year, the number of some small and medium-sized construction machinery enterprises is even more so, fittings mainly composed of components manufacturing enterprises to provide a step by step.Do have several big benefits, the host enterprises can concentrate on their own host product ready, reducing fittings fully borne by the host companies themselves, risk, and done more stronger fittings enterprises, have the ability to rapidly improve the quality of fittings, technology level, provide more new products for the host enterprises at the same time, it is easier to promote the development of the host product. Foreign engineering machinery host enterprises since 1988 up to $85 billion in sales, basically do not have changed much, and instead accessories from us $15 billion over the years, grow to $100 billion, and growth is considerable. As a result, foreign engineering machinery accessories developed fast in these years.
　　1.2 foreign engineering machinery fittings production has a long history and mature technology, variety complete, can fully meet the needs of all kinds of engineering machinery supporting
　　Many major construction machinery fittings enterprises abroad has 50 years, even 100 years of development history, the scale of the enterprise is relatively large, technology is mature, the variety is very complete also, almost everything. Such as the production of seals and shock absorber in the world's largest companies, Germany, Roy baker (Freudenberg) company, was founded in 1849, production of the seals and shock absorber has 100 years of history, its varieties, from technology, varieties can completely meet the requirements of the hydraulic industry for seals and sealing technology.It also constantly introduce new sealing materials and sealing structure, propel the development of the hydraulic seal technology continuously to a higher level. The largest engine manufacturing enterprises in the world's largest, in the United States Cummins (Cummins) engine manufacturing company, was founded in 1919, and almost has a history of nearly 100 years. 37.3 kW (more than 50 horsepower) diesel engine can be comprehensive for all kinds of engineering machinery, even all the needed power of various mechanical form a complete set of diesel engine, the technology can completely satisfy the most demanding of euro II, euro III emission standard, even can meet euro IV, euro V emission standard.
　　Within the fluid products field, the world's largest fluid products (mainly hydraulic parts, seals and hydraulic accessories, etc.) manufacturers, the United States parker (Parket) company, was founded in 1918, has nearly 100 years of history, can provide complete varieties, high technical level of all hydraulic parts, seals and hydraulic accessories. The world's largest variables used to static hydraulic system hydraulic components manufacturing enterprises, Dr - rexroth Germany company, has a history of more than 200 years, starting in 1953 comprehensive manufacturing hydraulic components, there are more than 50 years history.
　　Its most distinctive products are variables used to static hydraulic drive system of hydraulic components, whether swashplate or oblique type, closed type (pump control) or open (control valve) system hydraulic components are very is complete, the need for a variety of static hydraulic system components of the engineering machinery complete set of supporting the whole system. Manufacturing enterprises, and the world's largest driving part of Germany's ZF company, was founded in 1915, has nearly 100 years of history, can provide all kinds of engineering machinery with a wide range of transmission parts.In terms of electrical fittings, the world's largest German Siemens electric co., and Japan's Toshiba, kawasaki, Germany's doctoral (Bose), etc., has more than 50 years, even 100 years of history, can satisfy the engineering machinery all kinds of high technology level of electric system and electrical components.