【正文】 件各自局部地包圍著對方的蝸輪機構(gòu)就是雙包圍蝸輪蝸桿機構(gòu)。 當齒輪要用來傳遞相交軸之間的運動時，就需要某種形式的錐齒輪。在典型的錐齒輪安裝中，其中一個錐齒輪常常裝于支承的外側(cè)。然而在直齒圓柱齒輪情況下，在節(jié)線速度較高時，他們將發(fā)出噪音。這種齒輪之間的輪齒作用是沿著一根直線上產(chǎn)生滾動與滑動相結(jié)合的運動并和蝸輪蝸桿的輪齒作用有著更多的共同之處。軸能夠承受彎曲，拉伸，壓縮或扭轉(zhuǎn)載荷，這些力相結(jié)合時，人們期望找到靜強度和疲勞強度作為設計的重要依據(jù)。短的轉(zhuǎn)動 軸常常被稱為主軸。因之，設計者無論何時，動力傳遞零件，如齒輪或皮帶輪都應該設置在靠近支持軸承附近。進而有著大量的關(guān)于設計的問題，其中由于別的考慮例如剛度考慮，尺寸已得到較好的限制。因為兩個構(gòu)件開始以不同速度運轉(zhuǎn)而 使打滑發(fā)生了，并且在作用過程中能量散失，結(jié)果導致溫升。這個問題將必須對每個幾何機構(gòu)形狀分別進行研究。 分析摩擦離合器和制動器的各種形 式都應用一般的同樣的程序，下面的步驟是必需的： 1． 假定或確定摩擦表面上壓力分布； 2． 找出最大壓力和任一點處壓力之間的關(guān)系； 3． 應用靜平衡條件去找尋（ a）作用力；（ b）扭矩； (c)支反力。為了在結(jié)合過程中給變換作用予較長時間周期，夾爪可以是棘輪式的，螺旋型或齒型的。離合器需要同步操作。當?shù)竭_超載點時聽到的“喀嚓”聲就被認定為是所希望的信號聲。驅(qū)動作用是靠在套筒和平面之間契入的滾子來獲得。電磁線圈被裝入磁路中的某處。t falter in traditional machine and modern wheel gear and shafts mainly install the direction that delivers the dint at the principal axis passing to process to make them can is divided into many model numbers, useding for many situations we must be the multilayers to the understanding of the wheel gear and shaft in many ways . Key words: Wheel gear。 the two angles are equal for a 90deg. Shaft angle. When gears are to be used to transmit motion between intersecting shaft, some of bevel gear is required. Although bevel gear are usually made for a shaft angle of 90 deg. They may be produced for almost any shaft angle. The teeth may be cast, milled, or generated. Only the generated teeth may be classed as accurate. In a typical bevel gear mounting, one of the gear is often mounted outboard of the bearing. This means that shaft deflection can be more pronounced and have a greater effect on the contact of teeth. Another difficulty, which occurs in predicting the stress in bevelgear teeth, is the fact the teeth are tapered. Straight bevel gears are easy to design and simple to manufacture and give very good results in service if they are mounted accurately and positively. As in the case of squr gears, however, they bee noisy at higher values of the pitchline velocity. In these cases it is often good design practice to go to the spiral bevel gear, which is the bevel counterpart of the helical gear. As in the case of helical gears, spiral bevel gears give a much smoother tooth action than straight bevel gears, and hence are useful where high speed 7 are encountered. It is frequently desirable, as in the case of automotive differential applications, to have gearing similar to bevel gears but with the shaft offset. Such gears are called hypoid gears because their pitch surfaces are hyperboloids of revolution. The tooth action between such gears is a bination of rolling and sliding along a straight line and has much in mon with that of worm gears. A shaft is a rotating or stationary member, usually of circular cross section, having mounted upon it such elementsas gears, pulleys, flywheels, cranks, sprockets, and other powertransmission elements. Shaft may be subjected to bending, tension, pression, or torsional loads, acting singly or in bination with one another. When they are bined, one may expect to find both static and fatigue strength to be important design considerations, since a single shaft may be subjected to static stresses, pletely reversed, and repeated stresses, all acting at the same time. The word “ shaft” covers numerous variations, such as axles and spindles. Anaxle is a shaft