机械系（Department of Mechanical Engineering）.doc

机械系（Department of Mechanical Engineering） 3. input power of each shaft P (kw) (kw) (kw) (kw) 3.12, 2.90, 2.70, 2.57; 4. input torque of each shaft T (kN? M) (kN, m) (kN, m) (kN, m) 47.58, 143.53, 311.35, 286.91 5. main parameters of belt pulley Small diameter (mm) large wheel diameter (mm) Center distance a (mm) reference length (mm) The root number of the belt is Z 9022447114005 7. design of transmission bearing and drive shaft 1. design of drive bearing 1. For power P, the output shaft rotational speed, torque P =2.70KW =82.93r/min =311.35N.m 2. For role in the force on the gear The indexing circle diameter of a large gear at a low speed is known as =143.21 And F =? F = F F = F, Tan, =4348.16 * 0.246734=1072.84N The circumferential force F, the radial force F and the direction of the axial force F are shown here: The preliminary determination of the minimum diameter shaft. According to the textbook 15-2, the minimum diameter of the shaft is estimated initially, and the material of the shaft is 45 steel. The quenching and tempering treatment is carried out according to the textbook The minimum diameter of the output shaft is obviously the diameter of the coupling. In order to match the selected shaft with the shaft coupling, it is necessary to select the type of the coupling at the same time Check the textbook, select Because the calculated torque is less than the nominal torque of the coupling, so Check the manual of mechanical design LT7 type elastic sleeve pin coupling is selected, the nominal torque is 500Nm, and the aperture of the semi coupling is The diameter and length of each axis. The axial location is determined according to the requirements In order to meet the requirements of the half coupling axial positioning requirements of shaft section need make a right shoulder, so take the second and the third diameter; with the left shaft end ring positioning, according to the diameter of the shaft end ring diameter coupling half shaft end ring and in order to