Reduction gear belt drive

Contents

Contents

1 Introduction

2 Motor selection and kinematic calculation

3 Calculation of V-belt transmission

4 Calculation of cylindrical gear train

5 Preliminary calculation of shafts

6 Structural dimensions of gears and wheels

7 Calculation of reactions in supports

8 Construction of moments on shafts

9 Refined shaft calculation

10 Selection of coupling on drive output shaft

11 Test of key joints strength

12 Gearbox housing structural dimensions

13 Serviceability check of bearings

14 Choice of oil grade

15 Selection of fits

16 Gearbox assembly technology

17 Conclusion

18 List of literature used

16 Gearbox assembly technology

Prior to assembly, inner cavity of reducer housing is thoroughly cleaned and covered with oil-resistant paint. Assembly is performed in accordance with drawing of general view of reduction gear box, starting from shaft assemblies.

Keys are laid on shafts and gearbox gear elements are pressed. The retaining rings and bearings should be fitted, pre-heated in oil up to 80100 degrees Celsius, in series with the transmission elements. The assembled shafts are laid in the base of the reduction gear case and put on the cover of the case, covering the surfaces of the joint of the cover and the case with alcohol varnish. For alignment, a cover is installed on the body using two conical pins; bolts that attach the cover to the housing are tightened. After that, lubricant is put into bearing chambers, bearing covers with set of metal gaskets are installed, heat gap is adjusted. Prior to installation of through covers, cuff seals are put into grooves. By turning the shafts there is no jamming of bearings (the shafts must be rotated by hand) and the cover is fixed with screws. Then plug of oil discharge hole with gasket and iron oil indicator are screwed in. Oil is poured into the housing and the inspection hole is closed with a cover with a gasket, the cover is bolted. The assembled gearbox is rolled and tested on the bench according to the program set by the specifications.

17 Conclusion

During the course project on "Machine Parts," the knowledge gained over the past period of training in such disciplines as: theoretical mechanics, material resistance, materials science was fixed.

The purpose of this project is to design a drive, which consists of both simple standard parts and parts, the shape and dimensions of which are determined on the basis of design, technological, economic and other standards.

In the course of solving my task, the method of selecting the drive elements was mastered, design skills were obtained to ensure the necessary technical level, reliability and long service life of the mechanism.

The experience and skills gained during the course project will be required in the execution of both course projects and the diploma project.

It can be noted that the designed reduction gear has good properties in all respects.

Based on the results of calculation for contact endurance, the effective stresses in engagement are less than the permissible stresses.

Based on the results of the calculation of bending stresses, the actual bending stresses are less than the permissible stresses.

The calculation of the shaft showed that the safety margin is more than permissible.

Required dynamic lifting capacity of rolling bearings is less than passport capacity.

When calculating, an electric motor was selected that meets the specified requirements.