Tape Conveyor Drawing Archive

Contents

Introduction

1 Preparation of initial data for calculation

reduction gear on computer and selection of electric motor

2 Worm gearbox calculation

3 Preliminary calculation of shafts

4 Refined shaft calculation

5 Calculation of bearings for durability

6 Selection of reduction gear box lubrication

7 Test of key joint strength

8 Calculation of pin connection

9 Weld joint calculation

10 Calculation of bearing covers

11 Coupling calculation

12 List of literature used

Worm gearbox calculation

The gearbox was calculated using a computer. When designing the worm gearbox, it is necessary to resolve the issue of distributing the known total gear ratio ured between the high-speed uB and slow-speed ut stages of the gearbox (ured = uB * ut). Therefore, the program provides for calculations at different ratios uB/ut. The program also varies the heat treatment of the wheels, which very significantly affects the weight of the gearbox and its cost.

According to the calculated data, an optimal design option is sought, taking into account the minimum weight of the gearbox, the minimum cost and dimensions.

Based on the above requirements, I chose the following option: No. 3 (see Appendix 1)

Annex 1 shows the data for the calculation and the results obtained.

Gearbox lubrication selection

To reduce friction power losses and wear intensity of friction surfaces, as well as to prevent them from jamming, gouging, corrosion and better heat removal, the friction surfaces of the parts must have reliable lubrication.

Currently, a crankcase system is widely used in mechanical engineering for lubricating gears. To gearbox or gearbox housing

oil is poured so that wheel rims are immersed in it. When they rotate, the oil is carried away by the teeth, sprayed, falls on the inner walls of the body, from where it flows into its lower part. Inside the housing, a suspension of oil particles is formed in the air, which covers the surface of the parts located inside the housing.

Crankcase lubrication is used at circumferential speed of gears and worms from 0.3 to 12.5 m/s. At higher speeds, the oil is discharged from the teeth by centrifugal force and the engagement works with insufficient lubrication. In addition, the power loss for mixing the oil increases markedly and the temperature increases.

The choice of lubricant is based on the experience of the machines. The principle of assigning the oil grade is as follows: the higher the circumferential speed of the wheel, the lower the viscosity of the oil, the higher the contact pressures in the teeth, the greater the viscosity of the oil. Therefore, the required viscosity of the oil is determined depending on the contact voltage and the circumferential speed of the wheels. Circumferential velocity is determined in advance, then required kinematic viscosity and oil grade are found by speed and contact stresses.

According to Tables 11.1 and 11.2 (P.F. Dunaev, O.P. Lelilikov) oil is selected

I-G-A-22 TU38100145178.

Depth of oil immersion of worm gear parts at upper position of worm

Hmax = 0, 25d2 = 81 .9mm, Hmin = 2 m = 12 .6mm.