畢業(yè)設(shè)計(jì)外文翻譯---齒輪和軸的介紹-其他專業(yè)-資料下載頁(yè)
2025-01-19 04:17本頁(yè)面
【導(dǎo)讀】安裝在主軸箱來(lái)傳遞力的方向。所以我們對(duì)齒輪和軸的了解和認(rèn)識(shí)必須是多層次多方位的。因此，在斜齒輪的情況下，其齒向是不平行于回轉(zhuǎn)軸線的。斜齒輪用于傳遞平行軸之間的運(yùn)動(dòng)。斜齒輪使軸的軸承承受徑向和軸向力。當(dāng)軸向推力變的大了或由于別的原。排地裝在同一軸上的兩個(gè)斜齒輪等效。便產(chǎn)生最小的軸向推力。交錯(cuò)軸斜齒輪或螺旋齒輪，他們是軸中心線既不相交也不平行。一對(duì)相嚙合的交錯(cuò)軸斜齒輪通常具有同樣的齒向，即左旋主動(dòng)齒輪跟右旋從動(dòng)齒。蝸桿和蝸輪通常是用于向垂直相交軸之間的傳動(dòng)提供大的角速。齒斜角，該兩角之和就等于90度的軸線交角。這意味著軸的撓曲情況更加明顯而使在輪齒接觸上具有。短的轉(zhuǎn)動(dòng)軸常常被稱為主軸。但決不意味著設(shè)計(jì)者要保證；它們是安全的，軸。雖然來(lái)自方法在設(shè)計(jì)軸中難于應(yīng)用，但它可能用來(lái)準(zhǔn)確預(yù)示實(shí)際失效。
【正文】 torque transmitted, the energy loss and the temperature rise. The torque transmitted is related to the actuating force, the coefficient of friction, and the geometry of the clutch or brake. This is problem in static, which will have to be studied separately for eath geometric configuration. However, temperature rise is related to energy loss and can be studied without regard to the type of brake or clutch because the geometry of interest is the heatdissipating surfaces. The various types of clutches and brakes may be classified as fllows: 1. Rim type with internally expanding shoes 2. Rim type with externally contracting shoes 3. Band type 4. Disk or axial type 5. Cone type 6. Miscellaneous type The analysis of all type of friction clutches and brakes use the same 9 general procedure. The following step are necessary: 1. Assume or determine the distribution of pressure on the frictional surfaces. 2. Find a relation between the maximum pressure and the pressure at any point 3. Apply the condition of statical equilibrium to find (a) the actuating force, (b) the torque, and (c) the support reactions. Miscellaneous clutches include several types, such as the positivecontact clutches, overloadrelease clutches, overrunning clutches, magic fluid clutches, and others. A positivecontact clutch consists of a shift lever and two jaws. The greatest differences between the various types of positive clutches are concerned with the design of the jaws. To provide a longer period of time for shift action during engagement, the jaws may be ratchetshaped, or geartoothshaped. Sometimes a great many teeth or jaws are used, and they may be cut either circumferentially, so that they engage by cylindrical mating, or on the faces of the mating elements. Although positive clutches are not used to the extent of the frictionalcontact type, they do have important applications where synchronous operation is required. Devices such as linear drives or motoroperated screw drivers must run to definite limit and then e to a stop. An overloadrelease type of clutch is required for these applications. These clutches are usually springloaded so as to release at a predetermined toque. The clicking sound which is heard when the overload point is reached is considered to be a desirable signal. An overrunning clutch or coupling permits the driven member of a machine to “ freewheel” or “ overrun” because the driver is stopped or because another source of power increase the speed of the driven. This type of clutch usually uses rollers or balls mounted between an outer sleeve and an inner member having flats machined around the periphery. Driving action is obtained 10 by wedging the rollers between the sleeve and the flats. The clutch is therefore equivalent to a pawl and ratchet with an infinite number of teeth. Magic fluid clutch or brake is a relatively new development which has two parallel magic plates. Between these plates is a lubricated magic powder mixture. An electromagic coil is inserted somewhere in the magic circuit. By varying the excitation to this coil, the shearing strength of the magic fluid mixture may be accurately controlled. Thus any condition from a full slip to a frozen lockup may be obtained.
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