Machine elements

Darbas anglų kalba. Mašinos elementai. Toothed-belt and worm gear transmission. Kinematic scheme. Introduction. Selection of an electric motor. Determination of transmission ratio and torque. Calculation of a reducer. Main parameters of worm-gear. Main parameters of worm gear-wheel. Verifying calculations for a worm-gear. Forces acting in the engagement. Orientational calculation of shafts. Design of dimensions of worm-wheel. The calculations of acting forces, torques and bending moments. Selection of bearings. Selection of keys. Dimensions of the housing and fastening. Calculation of a belt drive. Heat calculation. Selection of fits and lubrication.

Worm-gear drives have wide application in mechanics because they have noisless operation, they can have rather high transmission ratios and not very big dimensions. Their work is even and uniform. Among shortcomings we have to note not big efficiency, they produce big amount of heat, they are rather expensive, because their production should be very accurate. Designed worm-gear will be used in the factory for moving crane base. Moving crane is carrying a load, so the movement of crane should be uniform, even. As worm-gear work is noisless, it increases comfortability for workers. Working medium is not "active". ...