機(jī)械專業(yè)畢業(yè)設(shè)計(jì)外文翻譯5-其他專業(yè)-資料下載頁
2025-01-19 12:29本頁面
【導(dǎo)讀】實(shí)際上，幾乎所有的機(jī)器中都裝有軸。軸最常見的形狀是圓形，其截面可以是實(shí)心的，也可以是空心的。有時(shí)也采用矩形軸，例如，螺絲起子的頭、套筒。扳手和控制旋扭的桿。為了在傳遞轉(zhuǎn)矩時(shí)不發(fā)生過載，軸應(yīng)該具有適當(dāng)?shù)目古?qiáng)度。說，在軸的長度等于其直徑的20倍時(shí)，扭轉(zhuǎn)角不應(yīng)該超過1度。輪、皮帶輪、凸輪、和離合器等零件傳遞動(dòng)力。因此，軸應(yīng)該有足夠的剛度以防止支撐軸承受力過大?？偠灾?，在兩個(gè)軸承支承之。間，軸在每英尺長度上的彎曲變形不應(yīng)該超過英寸。因此，要考慮扭矩與彎矩的當(dāng)量載荷。許用應(yīng)力中也應(yīng)該有一個(gè)考慮疲勞現(xiàn)象的安全系數(shù)。直徑小于3英寸的軸可以采用含碳量。于5英寸大，則要采用鍛造毛坯，然后機(jī)械加工到所要求的尺寸。輕載時(shí)，廣泛采用塑料。如果軸以臨界速度轉(zhuǎn)動(dòng)，將會(huì)發(fā)生強(qiáng)烈的振動(dòng)，可能會(huì)毀壞整臺(tái)機(jī)器。用來實(shí)現(xiàn)相鄰的兩根轉(zhuǎn)軸之間的半永久性聯(lián)接。在機(jī)器的正常使用期間內(nèi)，這種聯(lián)接一般不
【正文】 ly with bearing selection but with the conditions for correct installation. The fit of the bearing races onto the shaft or onto the housings is of critical importance because of their bined effect on the internal clearance of the bearing as well as preserving the desired degree of interference fit. Inadequate interference can induce serious trouble from fretting corrosion. The inner race is frequently located axially by abutting against a shoulder. A radius at this point is essential for the avoidance of stress concentration and ball races are provides with a radius or chamfer to allow space for this . Where life is not the determining factor in design, it is usual to determine maximum loading by the amount to which a bearing will deflect under load. Thus the concept of “static loadcarrying capacity” is understood to mean the load that can be applied to a bearing, which is either stationary or subject to slight swiveling motions, without impairing its running qualities for subsequent rotational motion. This has been 6 determined by practical experience as the load which when applied to a bearing result in a total deformation of the rolling element and raceway at any point of contact not exceeding percent of the rollingelement diameter. This would correspond to a permanent deformation of mm for a ball 25mm in diameter. The successful functioning of many bearing depends upon providing them with adequate protection against their environment, and in some circumstances the invigoration of the bearing surfaces. Achievement of the correct functioning of seals is an essential part of bearing design. Moreover, seals which are applied to moving parts for any purpose are of interest to iridologists because they are ponents of bearing systems and can only be designed satisfactorily on the basis of the appropriate bearing theory. Notwithstanding their importance, the amount of research effort that has been devoted to the understanding of the understanding of the behavior of seals has been small when pared with that devoted to other aspects of bearing technology.
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