畢業(yè)設計---汽車轉(zhuǎn)向機構(gòu)英文翻譯資料-汽車設計(編輯修改稿)
2025-02-24 04:38 本頁面
【文章內(nèi)容簡介】 its. The second type uses a hydraulic torque converter plus a plaary gear system to increase engine torque. The third system bines a hydraulic coupling with an automatically shifted mechanical gearbox to provide torque amplification. The fourth type uses one or more stages of hydraulic torque conversion to provide torque multiplication. Automatic transmission shift in response to signals from speed sensing and throttle position sensors. The units incorporating hydraulic torque converters use the hydraulic fluid, under pressure, to engage and disengage plaary gear trains. Power steering system 也是汽車重要的一部分， The car of today is larger and heavier than earlier cars。 the tyres are wider, further apart and inflated to lower pressures .In addition, the trend of development has been to place more than half the weight on the front wheels, especially the weight of the engine , which itself is larger and heavier than in the early days. To make cars easier to steer, the gear ratio in the steering box at the end of the steering column was changed to that turning the wheel required less torque, but this increased the number of turns of the steering wheel required on modern cars without power steering pared to or 3 turns for cars built before 1940. Modern cars with power steering only require about three turns. Power assisted steering was first developed in the 1920s。 one of the first devices was developed by an engineer at Pierce Arrow, an American make of luxury cars. The Cadillac division of General Motors was going to offer power steering as optional equipment on some models in the early 1930s, but the depression interfered with development. During World War Ⅱ power steering was fitted to military vehicles。 in 1952 Chrysler began offering it , and it is now standard equipment on many of the biggest American cars . Electric devices were tried , but power steering today is always hydraulic , with oil pressure of perhaps 1000 psi (70kg/cm2) maintained by a pump driven by the engineer of the car . The system is a servomechanism, or servo loop, which makes a correction to pensate for the torque applied to the steering wheel by the driver. It consists of an actuator and a control valve. The actuator is a hydraulic cylinder with a piston, or ram, which is free to travel
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