轮机英语关联题篇注解（参考）.doc

6．关联题 Passage 1 Valve drive mechanism The valve drive mechanism commands the inlet and exhaust valves at the required timing. 第3题The valve drive mechanism consists of an inlet and exhaust cam follower凸轮随动件 (8) each suspended in 悬浮在…中a plunger of the tappet assembly挺杆组件 (7), two tubular push rods空心的推杆 (4) with ball joints, two nodular cast iron 球墨铸铁rocker arms摇臂 (2) suspended in a rocker arm bearing bracket, two yokes吊梁(5) and a yoke guide pins导销. See Fig. 4-1. The tappet rollers 推杆滚柱follow the cam profiles and transfer the movements through push rods to the rocker arms. 第4题The rocker arms operate the inlet and exhaust valves through yokes (5). Lubrication for the rocker arms comes from the engines secondary oil supply manifold through drillings in the cylinder head and rocker arm bracket. 第2题The tappet assembly receives lubricating oil via channels in the engine block from the main supply manifold. For the roller and shaft, the oil is supplied through the guiding plunger. 第4题To compensate for heat expansion a clearance must exist between the rocker arm and yoke.第1题All adjustments have to be done on a cold engine only. 1. According to the Passage, the best time to adjust the valve clearance is _____. A. before the engine is started B. when the engine is running C. after the engine has just been stopped D. when something has gone wrong with the engine 注：根据文章来看，调节阀间隙的最好时间是在发动机启动之前。 2. The roller and the tappet assembly are lubricated by means of_____. A. the main lube system B. the secondary oil system C. the special pumping system D. the turbine oil system 注：滚轮和挺杆组件借助于主润滑系统润滑。 3. According to the Passage, the valve drive mechanism does not include_____. A. tappet rollers B. push rods C. nodular cast iron D. yokes and guide pins 注：根据文章来看，阀驱动机构不包括球墨铸铁。（包括杆滚轮、顶杆、吊梁和导销） 4. To close valves tightly, which clearance should be inspected according to the maintenance schedule? A. The one between the cam and the tappet roller.