Abstract: A complete hydraulic system consists of five parts, namely, power components, the implementation of co- mponents, control components, auxiliary components and hydraulic oil. The role of the hydraulic system is to help humanity work. Mainly by the implementation of components to rotate or pressure into a reciprocating motion. 15609
Key words: hydraulic system, pump, hydraulic valves
Hydraulic presser drive and air pressure drive hydraulic fluid as the transmission is made
according to the 17th century, Pascal's principle of hydrostatic pressure to drive the
development of an emerging technology, the United Kingdom in 1795 • Braman Joseph (Joseph
Braman ,1749-1814), in London water as a medium to form hydraulic press used in industry,
the birth of the world's first hydraulic press. Media work in 1905 will be replaced by oil-water
and further improved.
After the World War I (1914-1918) ,because of the extensive application of hydraulic
transmission, espec- ially after 1920, more rapid development. Hydraulic components in the late
19th century about the early 20th century, 20 years, only started to enter the formal phase of
industrial production. 1925 Vickers (F. Vikers) the invention of the pressure balanced vane
pump, hydraulic components for the modern industrial or hydraulic transmission of the gradual
establishment of the foundation. The early 20th century G • Constantimscofluct- uations of the
energy carried out by passing theoretical and practical research; in 1910 on the hydraulic trans-
mission (hydraulic coupling, hydraulic torque converter, etc.) contributions, so that these two
areas of develo-   pment.
The Second World War (1941-1945) period, in the United States 30% of machine tool
applications in the hydraulic transmission. It should be noted that the development of hydraulic
transmission in Japan than Europe and the United States and other countries for nearly 20 years
later. Before and after in 1955, the rapid development of Japan's hydraulic drive, set up in 1956,
"Hydraulic Industry." Nearly 20 to 30 years, the development of Japan's fast hydraulic
transmission, a world leader.
Hydraulic transmission There are many outstanding advantages, it is widely used, such as
general industr- ial use of plastics processing machinery, the pressure of machinery, machine
tools, etc.; operating machinery engineering machinery, construction machinery, agricultural machinery, automobiles, etc.; iron and steel indu- stry metallurgical machinery, lifting
equipment, such as roller adjustment device; civil water projects with flo- od control and dam
gate devices, bed lifts installations, bridges and other manipulation of institutions; speed turbine
power plant installations, nuclear power plants, etc.; ship from the deck heavy machinery
(winch), the bow doors, bulkhead valve, stern thruster, etc.; special antenna technology giant
with control devices, measu- rement buoys, movements such as rotating stage;
military-industrial control devices used in artillery, ship anti- rolling devices, aircraft simulation,
aircraft retractable landing gear and rudder control devices and other devi- ces.
A complete hydraulic system consists of five parts, namely, power components, the
implementation of co- mponents, control components, auxiliary components and hydraulic oil.  
    The role of dynamic components of the original motive fluid into mechanical energy to the
pressure that the hydraulic system of pumps, it is to power the entire hydraulic system. The
structure of the form of hydra- ulic pump gears are generally pump, vane pump and    piston
pump.  
    Implementation of components (such as hydraulic cylinders and hydraulic motors) which is
the pressure of the liquid can be converted to mechanical energy to drive the load for a straight 液压系统英文文献和中文翻译:http://www.751com.cn/fanyi/lunwen_17592.html