車輛工程專業(yè)畢業(yè)設(shè)計(jì)外文翻譯---自動(dòng)變速器如何工作-wenkub
2023-05-18 15:56:18 本頁(yè)面
【正文】 m engaging. Shift Valves Shift valves supply hydraulic pressure to the clutches and bands to engage each gear. The valve body of the transmission contains several shift valves. The shift valve determines when to shift from one gear to the next. For instance, the 1 to 2 shift valve determines when to shift from first to second gear. The shift valve is pressurized with fluid from the governor on one side, and the throttle valve on the other. They are supplied with fluid by the pump, and they route that fluid to one of two circuits to control which gear the car runs in. 外文資料 10 The shift valve will delay a shift if the car is accelerating quickly. If the car accelerates gently, the shift will occur at a lower speed. Let39。ve probably seen something that looks like this before. It is really the brain of the automatic transmission, managing all of these functions and more. The passageways you can see route fluid to all the different ponents in the transmission. Passageways molded into the metal are an efficient way to route fluid。s a speed increase. In this transmission, engaging the overdrive acplishes two things at once. If you read How Torque Converters Work, you learned about lockup torque converters. In order to improve efficiency, some cars have a mechanism that locks up the torque converter so that the output of the engine goes straight to the transmission. In this transmission, when overdrive is engaged, a shaft that is attached to the housing of the torque converter (which is bolted to the flywheel of the engine) is connected by clutch to the pla carrier. The small sun gear freewheels, and the larger sun gear is held by the overdrive band. Nothing is connected to the turbine。 this bination reverses the direction. You can see that this would also cause the bigger sun gear to spin。ve probably never tried driving a manual transmission car using only third gear. If you did, you39。ll work our way through an automatic transmission. We39。ll start with the key to the whole system: plaary gear sets. Then we39。d quickly find out that you had almost no acceleration when starting out, and at high speeds, the engine would be screaming along near the redline. A car like this would wear out very quickly and would be nearly undrive able. So the transmission uses gears to make more effective use of the engine39。 but because that clutch is released, the bigger sun gear is free to spin in the opposite direction of the turbine Second Gear This transmission does something really neat in order to get the ratio needed for second gear. It acts like two plaary gear sets connected to each other with a mon pla carrier. The first stage of the pla carrier actually uses the larger sun gear as the ring gear. So the first stage consists of the sun (the smaller sun gear), the pla carrier, and the ring (the larger sun gear). The input is the small sun gear。 the only input es from the converter housing. Let39。 without them, many hoses would be needed to connect the various parts of the transmission. First, we39。s discuss what happens when the car accelerates gently. As car speed increases, the pressure from the governor builds. This forces the shift valve over until the first gear circuit is closed, and the second gear circuit opens. Since the car is accelerating at light throttle, the throttle valve does not apply much pressure against the shift valve. When the car accelerates quickly, the throttle valve applies more pressure against the shift valve. This means that the pres
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