Design gearboxes for equipment and appliance drives

EDUCATIONAL INSTITUTION "SUKHOI GOMEL STATE TECHNICAL UNIVERSITY"
Department of Robotic Systems
EXPLANATORY NOTE
to the course project
in the discipline "Parts and Mechanisms of Devices and Machines"
on the topic: "To design gearboxes for equipment and device drives"
Gomel 2023

Design the worm gearbox based on the requirements. Calculate a single-stage worm gearbox according to the following data: Nv = 4 kW; nB = 70 rpm. Drive life: Tpr = 8 years; Annual and daily drive utilization rates: K year = 0.63 Kday = 0.5 ; Lh=21000 hours

TABLE OF CONTENTS 4
INTRODUCTION 6
1 Kinematic calculation of the drive 7
1.1 Determination of Drive TDP 7
1.2 Motor Selection 7
1.3 Determination of the total gear ratio of the drive and its breakdown into individual gears 9
1.4 Determination of power and kinematic parameters of the drive 9
2 Gearbox Transmission Calculation 11
2.1 Selection of Transmission Material 11
2.2 Determination of permissible contact stresses in endurance analysis. 12
2.3 Determination of Allowable Contact Stresses in the Design of Contact Strength under Maximum Load 13
2 .4 Design design for contact endurance 13
2.5 Contact Endurance Test Calculation 16
2.6 Verification Design for Contact Strength at Maximum Load 17
2.7. Determination of Permissible Bending Stresses in Endurance Design 17
2.8 Determination of Allowable Stresses in Flexural Strength Design with Maximum Load 18
2.9 Bending Endurance Test Calculation 19
2.10 Test design for flexural strength with maximum load 20
2.11 Geometrical parameters of gearing 21
3 Preliminary calculation of shafts. Coupling Selection 24
4 Structural dimensions of gearbox housing and cover components 26
5 First Stage of Gearbox Layout 28
6 Checking the durability of bearings by dynamic load capacity. 29
6.1 Determination of Forces Acting in Meshing and on Shafts 29
6.2 Determination of support reactions occurring in shaft bearing units and verification of bearing durability 30
7 Second Stage of Gearbox Sketch Layout 36
8 Keyway Strength Testing 38
9 Refined Shaft Calculation 40
10 Assigning Fits to the Main Gearbox Parts 45
11 Gearbox lubrication 46
12 Thermal Calculation of Gearbox 47
13 Calculation of Instrument Drive Structural Elements 48
13.1 Determination of Transmission Force and Kinematic Parameters 48
13.2 Calculation of Instrument Drive Transmission 51
CONCLUSION 61
REFERENCES 62
APPENDICES 63

Composition: General Layout, Specification, Worm Wheel Shaft, Worm, Instrument Drawing, Specification, Worm Wheel, Specification, 3D Shaft, Worm Reducer, Specification