【正文】 the vibration damping force, so that vehicle vibration energy into heat oil, and then distributed by the shock absorber to absorb the atmosphere. Channel crosssection and in the oil change and other factors, the damping force with the frame and axle (or wheel) the relative velocity between the increase or decrease, and the viscosity of the oil.Shock absorber ponents and flexibility with ease to assume the task of the impact and vibration, the damping force is too large, flexible suspension will deteriorate, and even damage to shock absorber connector. Hence, the flexibility to adjust shock absorber ponents and this contradiction.(1) in the pression stroke (near the axle and frame each other), a smaller shock absorber damping force in order to give full play to the role of elastic elements of flexibility, ease the impact. At this time, play a major role in elastic elements.(2) trip done in suspension (axle and frame away from each other), shock absorber damping force should be large and rapid damping.(3) When the axle (or wheel) and the relative velocity between the axle is too large, the request can automatically increase the shock absorber fluid flow, so that damping force is always maintained within certain limits in order to avoid to put too much impact load.In the automotive suspension system is widely used in Shock Absorber, and done in the pression and allday trip called the twoway play the role of the role of vibrationtype shock absorber, as well as the use of the new shock absorber, which includes inflatable adjustable shock absorber and shock absorber resistance.The role of twoway Shock Absorber Description working principle. In the pression stroke, the wheels moved closer to the body means a motor vehicle, shock absorber by pression, when the shock absorber piston within 3 down. Under the piston chamber of volume reduction, oil rise, the flow of oil through the valve 8 into the piston chamber above (superior). On the piston rod cavity was taken up as part of a space, thus increasing the cavity volume is less than the inferior vena cava to reduce the volume of oil was on the pression valve 6 open, flows back to storage tank 5. These valves to form a suspension of oilsaving campaign by the pression of the damping absorber in the journey done, the wheel is equivalent to far away from the body, the shock absorber by stretching. Shock absorber when the piston up. Increase the hydraulic piston chamber, the flow valve 8 closed, the cavity of the oil done away inferior vena cava inflow valve 4. Due to the existence of rod, since the cavity is not sufficient oil flow to the inferior vena cava with the increase in volume, under the instigation of a vacuum chamber generated, when the oil tanks in the open pensation valve 7 into the inferior vena supplement. As a result of these throttling valve in the role of suspension damping done to play the role of exercise.Done as a result of valve spring stiffness and prepression force greater than the design of the valve, in the same pressure, the valves done and the corresponding slot of the channel Changtong area contains less than the sum of the corresponding valves and pression Changtong channel crosssectional area of the sum of the gap. This has done the trip have a shock absorber damping force is greater than the pression stroke damping force to the requirements of the rapid damping.Shock Absorber, prospects for the development of automotive ponentsAuto parts as the basis of the automobile industry, the automotive industry is continuing to support the healthy development of the necessary factors. Especially now, the automotive industry is dynamic, full autonomy to carry out development and innovation, but also needs a strong support system as the parts. Own brand vehicles and technological innovation as the basis of the need for spare parts, parts of the independent innovation and development of automotive industry have a strong driving force, they are interactive, interaction, and there is no vehicle of their own brand, a powerful system ponents R amp。amp。 D innovation capability difficult to burst, there is no strong support system ponents, and independent brands forced to do difficult masterpiece.2006 January to December, Chinaamp。39。s total auto parts and accessories manufacturers to achieve a total industrial output value of 539,704,996 thousand, representing percent increase over the same period the previous year。 to achieve a total sales ine 527,234,933 thousand, representing percent increase over the same period the previous year。 achieve a cumulative total of 32,605,652 thousand dollars profit, than the percent increase over the same period the previous year。 As of the end of December 2006, the entire industry the number of abovescale enterprises for 6142.2007 January to November, Chinaamp。39。s total auto parts and accessories manufacturers to achieve a total industrial output value of 683,525,503 thousand dollars more than the same period last year increased by %。 to achieve a total sales ine 663,529,269 thousand, representing an increase of over the same period last year %。 the realization of the cumulative total amount of 48,487,363 thousand dollars profit last year, an increase of percent over the same period。 as at the end of November 2007, the entire industry the number of abovescale enterprises for 7171.2008 January to November, Chinaamp。39。s auto parts and accessories manufacturing industry realized a total industrial output value of 865,835,708 thousand dollars more than the same period last year increased by %。 to achieve a total sales ine 837,913,601 thousand dollars more than the same period last year increased by % 。 the realization of the cumulative total amount of 53,876,595 thousand dollars profit last year, an increase of percent over the same period。 as at the end of November 2008, the entire industry the number of abovescale enterprises for 8303.Auto parts manufacturers from