【正文】 ]1/2 = 式中 (d1是螺釘?shù)穆菁y小徑，[б]是螺釘?shù)脑S用拉應力) [12]第九章 液壓缸與密封件的設(shè)計設(shè)計液壓缸時，要在對液壓系統(tǒng)工作情況分析的基礎(chǔ)上，根據(jù)液壓缸在機構(gòu)中所要完成的任務(wù)來選擇液壓缸的結(jié)構(gòu)形式，然后按負載、運動要求、運動要求、最大行程等確定主要尺寸，進行強度、穩(wěn)定性和緩沖驗算，最后進行具體的結(jié)構(gòu)設(shè)計。缸筒內(nèi)徑D： 根據(jù)負載大小和選定的工作壓力，或運動速度和輸入流量計算，再參考GB234880標準選取缸筒內(nèi)徑D=活塞桿直徑d： 按工作時受力情況，參考GB345880標準確定d=27mm鋼筒長度L: 根據(jù)最大工作行程確定L=126mm對于液壓缸的缸筒壁厚δ活塞桿直徑d缸蓋處固定螺釘?shù)闹睆?，在高壓系統(tǒng)中，必須進行強度校核。泄漏分為內(nèi)泄漏和外泄漏兩類。因此，密封的方法通常有：封住結(jié)合面的間隙；切斷泄漏通道；增加泄漏通道中的阻力；設(shè)置做功元件，對泄漏介質(zhì)造成的壓力，以抵消或平衡泄漏通道的壓力差。為自己今后更好的學習數(shù)控技術(shù)指明了方向。指導老師經(jīng)過詳細的檢查后對我的設(shè)計給予詳細的、全面的批評指正和修改建議。s loyal supporter, SUV fuel consumption as a major development bottleneck. SUV pared with the sedan, SUV fuel consumption volume, its sales will inevitably be a certain degree of impact. But highend SUV on the impact of relatively small, because it has a specific customer base. Lowpriced SUV because of oil prices, parking fees of uncertainty are to a certain extent, this has hampered its development, and the fuel tax differential rate of the ultimate SUV introduced to the negative impact of development is obvious [1]. China39。s hydraulic transmission from the military into civilian and new applications are running on the machine, a hydraulicdriven engineering machinery, tractors and bine harvesters, and so on. With the improvement of the industrial level, is now a welldesigned, wellmanufactured hydraulic system has no oil leakage phenomenon. Using highstrength materials, hightech surface treatment technologies and highprecision machining quality of hydraulic ponents, the efficiency of the transmission are no longer defective. A hydraulic accumulator for the storage of hydraulic ponents mechanical energy storage pound on the braking system in the United Kingdom, the United States, Denmark, Sweden and Germany have conducted. In Denmark, P. Buchwald, and other scholars in the city buses are equipped with brake accumulator energy transmission system, transmission system imposed by the posite of different control strategies, will enable the fuel economy of vehicles increased 30 percent fuel savings . During the trial bench of the test also receive a high rate of fuel. Swedish scholars on energy accumulator in the braking traction lootives and forklift on the application of a theoretical study, concluded that: accumulator energy storage flywheel energy storage than the braking system braking more effective. To 1985, Germany has been equipped with a braking system accumulator storage buslike vehicle. MAN. Hydrobus through projections, stefen. Martin concluded: bus brake system into storage after the brake system, three years savings vehicles can be modified cost recovery, but also at the same time reducing the emission engine Benefits. In recent years, Canada, some Japanese scholars are continuing research in this area, the wells will result applied for a patent. At present, Sweden introduced a new series of energysaving hydraulic drive system: Cumulo hydrostatic drive system [2], as shown in Figure 1. Figure 2 is the . Environmental Protection Agency and the Ford joint study of a drive hybrid device [3], to the displacement of SUV cars more suitable for the use of such devices by flooding. These technological developments for the authors of the new flooding in the SUV vehicle drive system laid the foundation for the application.2 new SUV drive vehicle drive system of the basic programme Flooding of the new SUV vehicle drive system design structure as shown in Figure 3. Series and its hydrostatic drive system different is that it abolished the middle rearwheel drive devices, directly to the hydraulic pump / motor vehicles installed in the back two wheels, while off devices to drive more efficient, CVT to the magnetic clutch, retained control of the actuator frontwheel drive, so reducing the number of the efficiency of energy conversion and loss. In peacetime conditions and the general urban highway used two rear wheels on the drive to meet the need, without the need for a fourwheel drive to save fuel consumption, in a number of specific occasions (such as crosscountry, etc.) can hang up before Wheel drive vehicle to increase the dynamic performance. In this way, users can satisfy some of the momentum of the vehicle requirements, can save fuel consumption of motor vehicles, reducing vehicle emissions, to achieve environmental protection and energy conservation requirements. New drive vehicle drive system of the working principle: the engine work, from ECU engine control intermittent work in the best economy of the region, through the magnetic clutch enginedriven hydraulic pump connected to the hydraulic system and hydraulic energy storage Provides highpressure oil. Rearwheel cars have a secondary ponent in the drive vehicles moving from hydraulic pump and hydraulic pressure accumulator to provide oil, the second drive ponents and wheels turning in the vehicle when the braking kinetic energy through the The hydraulic ponents can be converted to storage to the accumulator. Electronic control system through highspeed switching control valves were each secondary ponent of the emissions to ensure that in a different condition, two wheels can be ideal of torque. When carrying out fourwheeldrive, the actuator will be closed so that the frontwheel drive also joined the ranks, which have higher dynamic performance to meet the requirements of specific conditions.3 new SUV vehicle transmission characteristics of flooding To conserve energy as the objectives of the electronic control system must meet the flooding of its design guidelines to design its structure, the system can achieve its functional requirements. Flooding of the new SUV drive system has the following characteristics. ) constant pressure to network and secondary regulation hydrostatic drive system based on the theory. With variable and variable pump motor development, hydrostatic transmission in the application of more and more hydraulic pump / mot