国产男女无遮挡_日本在线播放一区_国产精品黄页免费高清在线观看_国产精品爽爽爽

  • 熱門標(biāo)簽

當(dāng)前位置: 主頁 > 航空資料 > 機(jī)務(wù)資料 >

時間:2010-05-30 14:30來源:藍(lán)天飛行翻譯 作者:admin
曝光臺 注意防騙 網(wǎng)曝天貓店富美金盛家居專營店坑蒙拐騙欺詐消費者

16.
The overall layout of an external gearbox is dictated by a number of factors. To reduce drag whilst the aircraft is flying it is important to present a low frontal area to the airflow. Therefore the gearbox is 'wrapped' around the engine and may look, from the front, similar to a banana in shape. For maintenance purposes the gearbox is generally located on the underside of the engine to allow ground crew to gain access. However, helicopter installation design usually requires the gearbox to be located on the top of the engine for ease of access.

17.
The starter/driven gearshaft (fig. 7-4) roughly divides the external gearbox into two sections. One section provides the drive for the accessories which require low power whilst the other drives the high power accessories. This allows the small and large gears to be grouped together independently and is an efficient method of distributing the drive for the minimum weight.

18.
If any accessory unit fails, and is prevented from rotating, it could cause further failure in the external gearbox by shearing the teeth of the gear train. To prevent secondary failure occurring a weak section is machined into the driveshafts, known as a


pumps, because these units are vital to the running of the engine and any failure would necessitate immediate shutdown of the engine.
19.
Since the starter provides the highest torque that the drive system encounters, it is the basis of design. The starter is usually positioned to give the shortest drive line to the engine core. This eliminates the necessity of strengthening the entire gear train which would increase the gearbox weight. However, when an auxiliary gearbox is fitted (para, 21) the starter is moved along the gear train to allow the heavily loaded auxiliary gearbox drive to pass through the external gearbox. This requires the spur gears between the starter and starter/driven gearshaft to have a larger face width to carry the load applied by the starter (fig. 7-5).

20.
When a drive is taken from two compressor shafts, as discussed in para. 7, two separate gearboxes are required. These are mounted either side of the compressor case and are generally known as the 'low speed' and 'high speed' external gearboxes.


Auxiliary gearbox
21.
An auxiliary gearbox is a convenient method of providing additional accessory drives when the con-figuration of an engine and airframe does not allow enough space to mount all of the accessory units on a single external gearbox.

22.
A drive is taken from the external gearbox (fig. 7-5) to power the auxiliary gearbox which distributes the appropriate gear ratio drive to the accessories in the same manner as the external gearbox.


CONSTRUCTION AND MATERIALS
Gears
23.
The spur gears of the external or auxiliary gearbox gear train (fig. 7-4 and 7-5) are mounted between bearings supported by the front and rear casings which are bolted together. They transmit the drive to each accessory unit, which is normally between 5000 and 6000 r.p.m. for the accessory units and approximately 20,000 r.p.m. for the centrifugal breather,

24.
All gear meshes are designed with 'hunting tooth' ratios which ensure that each tooth of a gear does not engage between the same set of opposing teeth on each revolution. This spreads any wear evenly across all teeth.

 

輔助齒輪箱
21.在發(fā)動機(jī)和飛機(jī)機(jī)體的布局沒有足夠的空間在一個外部齒輪箱上安裝所有的附件裝置的情況下。輔助齒輪箱便是提供外加附件裝置傳動的一種方便的方法。
20.正如第7段所述,傳動來自兩個壓氣機(jī)軸的時候,就要求有兩個獨立的齒輪箱。它們分別裝在壓氣機(jī)機(jī)匣的兩側(cè),通常稱為“低速”和“高速”外部齒輪箱。
19.由于起動機(jī)發(fā)出的扭矩是傳動系統(tǒng)所遇到的最大扭矩,所以它是設(shè)計的基礎(chǔ)。通常起動機(jī)的位置安排要使其與發(fā)動機(jī)的核心的傳動線路最短。這就不必要去加強(qiáng)整個齒輪系,否則會增加齒輪箱的重量。當(dāng)裝有輔助齒輪箱時(第21段)。起動機(jī)要順著齒輪系移開,讓載荷很大的輔助齒輪箱傳動裝置能通過外部齒輪箱引出。這就要求在起動機(jī)和起動機(jī)/傳動齒輪軸之間的正齒輪應(yīng)有更大的齒面寬度來承受起動機(jī)施加的載荷(圖7-5)。
22.輔助齒輪箱由外部齒輪箱(圖7-5)來驅(qū)動,它為附件分配相應(yīng)的齒輪傳動比,其情況類似于外部齒輪箱。
結(jié)構(gòu)和材料
齒輪
23.外部齒輪箱或輔助齒輪箱齒輪系(圖7-4和圖7-5)的正齒輪裝在前后機(jī)匣支承的軸承之間。前后機(jī)匣則由螺栓連接在一起。這些正齒輪將傳動傳遞到每一個附件裝置。附件裝置的轉(zhuǎn)速通常在5000到6000轉(zhuǎn)/分之間,而離心通風(fēng)機(jī)則為20000轉(zhuǎn)/分左右。
Accessory drives


25.螺旋傘齒輪被用來連接那些彼此呈一定角度,但位于同平面內(nèi)的那些軸。在一個齒輪系之中的多數(shù)齒輪是直齒正齒輪,齒面最寬的那些正齒輪可用來承受最大的載荷。對于要求較為平穩(wěn)的運轉(zhuǎn)來說,通常使用螺旋齒輪,但由這種齒輪的齒型造成的端面合成推力應(yīng)當(dāng)由齒輪的安裝方式加以解決。

圖7-4 一種外部齒輪箱和一些附件裝置
Fig. 7-4 An external gearbox and accessory units.
低壓燃油泵
液壓泵
前機(jī)匣
滑油泵
后機(jī)匣
起動機(jī)
燃油流量
調(diào)節(jié)器
 
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址:勞斯萊斯噴氣引擎-中英(34)

国产男女无遮挡_日本在线播放一区_国产精品黄页免费高清在线观看_国产精品爽爽爽
国产一区不卡在线观看| 国产精品乱码视频| 91精品国产91久久久久久| 久久久久久久久久久av| 欧美激情视频在线观看| 热久久美女精品天天吊色| 日韩成人在线资源| 国产九九精品视频| 久久久久99精品久久久久| 亚洲7777| 国产美女久久久| 国产麻花豆剧传媒精品mv在线 | 日韩在线观看免费高清| 久久99国产综合精品女同| 欧洲午夜精品久久久| 91久久国产婷婷一区二区| 久久夜色撩人精品| 欧美一区激情视频在线观看| 91精品国产高清久久久久久91 | 欧美精品激情视频| 精品欧美一区二区三区久久久| 国产成人亚洲综合青青| 精品国产乱码久久久久久蜜柚| 精品日本一区二区| 俺去啦;欧美日韩| 日本一区视频在线| 88国产精品欧美一区二区三区| 国产av国片精品| 国产一区视频在线播放| 国产精品美乳一区二区免费| 欧美影视一区二区| 日韩三级成人av网| 奇米精品一区二区三区| 国产极品精品在线观看| 欧美极品欧美精品欧美视频| 国产色视频一区| 欧美精品制服第一页| 欧美一区二视频在线免费观看| 色妞在线综合亚洲欧美| 任我爽在线视频精品一| 久久精品国产sm调教网站演员 | 黄色片一级视频| 日韩视频精品在线| 午夜啪啪免费视频| 91精品啪在线观看麻豆免费| 亚洲欧美日韩精品在线| 丰满少妇久久久| 在线视频91| av观看免费在线| 亚洲不卡1区| 国产v综合ⅴ日韩v欧美大片| 日本高清久久一区二区三区| 久久视频这里有精品| 偷拍视频一区二区| 久久riav二区三区| 人人干视频在线| 国产精品区一区二区三含羞草 | 国产精品人成电影在线观看 | 久久最新免费视频| 色综合久久久久无码专区| 国产精彩精品视频| 欧洲熟妇精品视频| 国产精品后入内射日本在线观看| 国产一区玩具在线观看| 久久国产精品偷| www.九色.com| 欧美一级中文字幕| 精品国产欧美成人夜夜嗨| 免费99视频| 亚洲最大福利视频网站| 久久久中精品2020中文| 欧美一级大胆视频| 欧美精品在线免费观看| 91精品国产九九九久久久亚洲| 日本精品性网站在线观看| 久久精品国产免费观看| 国产日韩欧美综合| 痴汉一区二区三区| 国产黄视频在线| 少妇久久久久久被弄到高潮| 久久精品国产电影| 成人精品在线观看| 人妻少妇精品久久| 九九热在线精品视频| 国产精品99久久99久久久二8 | 欧美最大成人综合网| 久久久999成人| 国内揄拍国内精品| 欧美精品九九久久| 久久久久久久色| 国产资源第一页| 亚州欧美日韩中文视频| 国产精品美腿一区在线看| 国产一区亚洲二区三区| 日韩在线视频在线| 久久91亚洲精品中文字幕| 久久亚洲精品欧美| 黄网站色视频免费观看| 亚洲一区二区三区精品在线观看| 日韩一中文字幕| 不卡一卡2卡3卡4卡精品在| 欧日韩不卡在线视频| 亚洲一二三区精品| 久久精品视频在线观看| 国产精彩视频一区二区| 欧美国产亚洲一区| 国产精品久久久久久久久婷婷 | 青青青在线视频播放| 午夜精品久久久99热福利| 国产精品欧美一区二区| 粉嫩av四季av绯色av第一区| 国产精品夜夜夜爽张柏芝| 国产激情视频一区| 中文精品一区二区三区| 国产精品主播视频| 97久久精品在线| 亚洲综合日韩在线| 日本在线高清视频一区| 97人人香蕉| 一本久道久久综合| 国产精品秘入口18禁麻豆免会员| 91精品国产乱码久久久久久久久 | 国产一区二区三区奇米久涩 | 国产精品中文在线| 日本精品视频一区| 亚洲中文字幕无码av永久| 国产精品男人的天堂| 久久免费99精品久久久久久| 成人免费a级片| 国产一级做a爰片久久毛片男| 欧美在线亚洲一区| 日韩免费精品视频| 亚洲精品国产精品国自产观看| 在线观看一区二区三区三州| 国产精品户外野外| 国产精品无码电影在线观看| 国产z一区二区三区| 97国产精品视频| 高清不卡日本v二区在线| 蜜桃91精品入口| 今天免费高清在线观看国语| 午夜一区二区三视频在线观看| 午夜久久久久久久久久久| 亚洲午夜久久久影院伊人| 欧美激情免费在线| 欧美精品在线免费播放| 久久天天躁狠狠躁夜夜躁2014 | 欧美精品在线网站| 久久成年人免费电影| 国产精品视频一区二区三区四区五区 | 久久免费视频1| 国产精品一区在线观看| 91久久精品国产| 99国产精品白浆在线观看免费 | 欧美深夜福利视频| 欧美日韩在线高清| 日韩精品一区二区三区电影| 日本少妇高潮喷水视频| 日韩视频第二页| 日韩精品无码一区二区三区| 欧美一性一乱一交一视频| 虎白女粉嫩尤物福利视频| 国产在线精品播放| 高清欧美精品xxxxx| 91精品国自产在线观看| 久久免费视频2| 日韩中文第一页| 国产精品久久色| 国产精品海角社区在线观看| 亚洲午夜精品国产| 亚洲高清123| 中文字幕一区二区三区四区五区人 | 久久久久久成人精品| 亚洲第一在线综合在线| 日本一区视频在线播放| 欧美中文字幕第一页| 欧美精品成人网| 国产欧美日韩最新| 97精品国产97久久久久久粉红 | 国产欧美一区二区三区视频| 国产噜噜噜噜噜久久久久久久久| 国产男女无遮挡| 国语精品中文字幕| 国产精品综合不卡av| 97久久精品人人澡人人爽缅北| 国产福利久久| 国产精品久久国产| 影音先锋欧美在线| 日韩中文字幕亚洲精品欧美| 欧美亚洲激情视频| 国产日韩av在线| 国产a视频免费观看| 久久夜色精品国产| 亚洲 欧美 综合 另类 中字| 日韩精品国内| 高清视频在线观看一区| 久久一区免费| 久久av资源网站| 亚洲精品一卡二卡三卡四卡| 欧美亚洲另类激情另类|