轴与传动试题（Axle and transmission test questions）.docVIP

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轴与传动试题（Axle and transmission test questions）.doc

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轴与传动试题（Axle and transmission test questions）

轴与传动试题（Axle and transmission test questions） Fill in the blanks: (1 cents per hour, 30 points) The axial distance between two adjacent teeth of 1. threads on the middle diameter line is called pitch. 2. from the point of view of use, the triangle thread is mainly used for connection; the remainder is used for transmission. 3., there are many ways to prevent loose, and its working principle can be divided into friction, anti loose, mechanical anti loose, chemical anti loose and permanent anti loose, etc.. 4., Chinas ordinary V belt is divided into Y, Z, A, B, C, D, E seven models, of which Y belt section area is the smallest, E belt with the largest transmission power. 5. belt drives main geometric parameters are: belt reference length, etc.. Packing angle, transmission ratio and pulley diameter of belt pulley 6. through the axis of the worm and vertical to the axis of the worm plane is called the middle plane, in the middle plane, the worm and worm gear meshing is equivalent to the involute gear and rack meshing. The main parameters of the 7. worm drive include the number of worm head, the number of worm gear, the ratio of transmission, the diameter of worm indexing circle and the diameter coefficient of worm, the ascending angle of worm helix. The main failure modes of 8. worm drive are scuffing, pitting and wear. 9. parts on shaft axial fixation mainly adopts shaft shoulder, collar, round nut sleeve, elastic ring and screw method. 10. according to the load bearing direction or nominal contact angle of rolling bearings can be divided into radial bearings and thrust bearings _?. 11. the common shaft hub is connected by key, spline and interference fit. 12., according to the gear system running, the gear axis position relative to the rack is fixed, can be divided into fixed axis gear train, epicyclic gear train. Two, select:. (2 points for each question, 20 points each.) 1. the tooth shape angle of the ordinary thread is A, the angle of the tooth of the pipe thread i