Question

机械专业英语 急求翻译（采用后再加十分）

二 8. In engineering drawing , it is necessary to provide the nominal size tolerance
(a) if the function or the economical aspect of the manufacturting process of the workpieces requires that certain limiting dimensions be maintained;
(b) if the parts are required to have a fit ;
(c) if the parts are separately finished and need to be assembled without post-machining;
(d) if the parts are to be interchangeable ,e.g., spare parts;
(e) if it is necessary that the part be toleranced so that it can be held in a particular fixture for finishing operations .

9. Additional benefits of power systems include instantly reversible motion ,automatic protection against overloads ,and infinitely variable speed control .Fluid power systems also have the highest horsepower per weight ratio of any known power source .

10. Gears play such an important part in machines that they have become the symbol for machinery . They are wheels with teeth engage or mesh with each so that they work in pairs to transmit or change motion .They are frequently used reduce or increase the speed of a motion and they can also change the direction of motion . The line around which a wheel rotates is its axis ; gear can change axial motion .

三．翻译成汉语

The liquid discharges by the pump in a fluid-power system is directed by valves to a hydraulic motor .A hydraulic motor develops force and motion ,using the pressurized liquid as its energy source . Many hydraulic motors are similar to pumps ,except that the motor operates in a reverse manner from a pump .
Where linear instead of rotary motion is desired ,a cylindrical tube fitted with a movable piston ,called a hydraulic cylinder ,is often used . When the piston is moved by the pressurized fluid , the piston rod imparts a force or moves an object though a desired distance .
Restricting the movement of the piston in a hydraulic cylinder,as when the piston carries a load , creates a specific pressure relationship within the the cylinder .The surface area of the piston face is said to contain a specific number of square inches .The pressure of the pressurized liqid , multiplied by the piton area ,produces an output force ,measured in pound , at the end of the piston rod .

Answer 1

二8。在工程图纸,需提供标准尺寸公差
(一)若功能或经济方面的manufacturting过程中需要一定的限制的工件尺寸是维护。
(b)如果这部分是需要一个合适的。
(三)如果这部分是单独完成,需要组装,没有post-machining。
(d)如果第三部分是可互换的,例如,备件。
(e)如果有必要的话,会toleranced,这样它才能被关押在一个特殊夹具为完成作业。
9。另外,电力系统包括立即可逆运动、自动保护超载,无极变速控制.Fluid电力系统也有最高的马力的重量配比,任何已知的电源。

10。齿轮扮演的重要组成部分,它们已经成为了机器的象征机械。他们以互相啮合齿聘请或使他们进行分组传送或改变运动是常用的速度减少或增加一个运动,他们也可以改变方向的运动。轮子绕着它的是它的轴旋转运动,可以改变轴齿轮。
三.翻译成汉语

由泵,液体的排放在fluid-power系统是由阀液压马达之类的液压马达力和运动的发展,利用压液体作为它的能量来源。许多液压马达相似,除了那个泵电机运行在一个反向的方式从泵。
在线性代替旋转时,需要一个圆筒形金属管装有移动式活塞,称为液压缸是经常使用。当活塞很感动,压流体活塞杆给予力量或移动对象虽然所需的距离。
限制的运动在液压缸活塞,当活塞负载,创造出特定的压力的关系,在缸活塞面积的脸说含有特定数量的平方英寸,压力,乘以liqid受压区,使产生输出力,以磅,在最后,活塞杆。