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求外文翻譯是汽車專業的就行，兩百分，在線等

直接給文章，我找了一下午，快崩潰了。。。: 問提問者：網友 | 2017-08-17

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the steering gear includes a housing, a worm,a ball nut,a rack made integral with the piston,a hydraulic booster,and a toothed sector integrated with the pitman arm shaft.The power steering system of some trucks is provided with an oil cooler. The ball nut of the steering gear is rigidly secured inside the rack-piston .The thickness of the teeth on the rack and sector teeth can be adjusted by the adjusting screw driven in the side cover of the housing. To decrease friction between the worm and the nut, balls recirulate in their thread. The tack-piston has resilient split tings of cast iron ensuring its tight fit in the steering gear houding. The rotation of the steering shaft is converted into progressive motion of the rack-piston owing to displacement of the nut along the worm.The rack-piston teeth turn valve is arranged before the housing of the steering gear.The double-acting(two-chamber type) vane pump of the hydraulic booster with reservoir and filter is mounted on the engine. It is driven by a V-belt from the crankshaft pulley or by a gear train.The normal sag of the drive belt is 8-14nnn at a load of 40N.The pump is connected to the control valve by two hoses:a pressure hose through which the oil is delivered from the pump and a return hose for returning the oil to the reservoir. The universal jionts of the steering shaft diminish deformations imparted to the cab from the frame and reduce the dimensions of the steering mechanism.The joint yokes are connected with the steering shaft on the top and woth the steering gear drive shaft in the borrom. The yoke holes receive crosses mounted on bronze bushings. The steering mechanism comprises a steering wheel,a steering shaft,a steering column,a steering gear housing with side and lower covers,a globlid worm,a pitman shaft with a triple miler and bearings and a pitman shaft adjusting screw. The housing of the steering gear accimmodates a worm and a pitman shaft with a roller. The housing is boltded to the frame.發動機是汽車的動力源泉，是汽車的關鍵部件，汽車的一些基本性能都直接或間接地與發動機的性能相聯系。由于發動機的構造非常復雜，因而導致出現的故障也多種多樣，若發動機出現故障將直接影響汽車能否正常行駛，發動機故障診斷是汽車故障診斷的關鍵所在。發動機的異響是發動機常見故障之一，它對汽車的技術狀況和使用性能有很大影響，而產生發動機異響故障的因素很多，錯綜復雜，給診斷帶來一定的困難，所以研究發動機異響的診斷對實際的汽車維修有很大意義。本文在介紹發動機基本構造和工作原理的基礎上重點介紹了發動機異響的機理分析和發動機異響診斷的典型方法，其中診斷方法主要介紹了人工經驗診斷和儀器輔助診斷兩種。人工經驗診斷是通過對汽油發動機和柴油發動機出現異響的原因進行分析，提出在實際維修過程中診斷異響應考慮的因素和無檢測儀器的情況下正確判斷異響部位的手段和方法。儀器診斷主要介紹利用示波器檢測發動機重要部位振動波形，并對檢測到的波形進行分析，以此對發動機異響做出正確判斷。在此基礎上又列舉了汽油發動機與柴油發動機異響故障的典型案例，經過分析對異響與各種因素的關系進行了闡述，并介紹了幾種診斷方法，最后根據診斷過程繪制出診斷流程圖，旨在能為同行提供可借鑒的經驗。: 回答者：網友

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