Cash-explanatory note to the course project for machine parts

Table of contents
The task for course projects. 2
INTRODUCTION 6
1 LOAD PARAMETERS 7
1.1 angular velocity SHAFT 7
1.2 POWER TRANSMISSION 7 on the shafts
1.3 TORQUE TRANSFER on the shafts 8
1.4 Design loads In the transmission of 8
1.4.1 Pressures in worm gear (I stage) 8
1.4.2 The load in the gear mechanism (II stage) 9
2 CALCULATION OF TRANSMISSION STRENGTH 10
2.1 Calculation of the strength of the worm gear. 10
2.1.1 .Proektirovochny payment on the contact endurance 10
2.1.1.1 The basic formula for determining the transmission parameter. 10
2.1.1.2 Material worm and worm wheel. 10
2.1.1.3 Allowable contact voltage 11
2.1.1.4 The initial calculation parameters 11
2.1.1.5 The calculated ratios. 12
2.1.1.6 Wheelbase worm gear teeth and the module. 12
2.1.2 Basic geometric dimensions of the ring gear and additional extended transmission parameters. 13
2.1.2.1 The source circuit in accordance with GOST 19036-21. 13
2.1.2.2 The dimensions of gear rims. 13
2.1.2.3 Additional design parameters. 14
2.1.3 Defining the parameters and calculations on the active surfaces of the contact endurance of teeth of the worm wheel. 14
2.1.3.1 The calculated ratios. 14
2.1.3.2 Specific design circumferential force. 15
2.1.3.3 Clarification of values \u200b\u200bpermissible contact voltage. 15
2.1.3.4 Calculation on the contact endurance active surfaces of the teeth of the worm wheel. 15
2.1.4 Defining the parameters and calculations on the active surfaces of the contact endurance units by the action of the maximum load. 15
2.1.4.1 Allowable contact voltage limit 15
2.1.4.2 The calculation is performed on the contact strength formula. 15
2.1.5 Defining the parameters of the calculation endurance of teeth of the worm gear in bending. 16
2.1.5.1. The calculation formula was adopted in the form. 16
2.1.5.2 The calculated ratios. 16
2.1.5.3 Specific design circumferential force. 16
2.1.5.4 Permissible voltage when calculating the teeth of the worm wheel endurance in bending. 16
2.1.5.5. Calculation of teeth on the endurance in bending. 17
2.1.6 Definition of parameters and calculation of the strength of the teeth of the worm gear in bending with a maximum load. 17
2.1.6.1. Permissible limit bending stress. 17
2.1.6.2 Calculation on the flexural strength. 17
2.1.7 Checking the stiffness of the worm 17
2.1.8 The efficiency of the worm gear. 18
2.1.9 Calculation of the worm gear 18 for heating
2.2 Calculation of the strength of gears 20
2.2.1 Engineering calculation on the contact endurance. 20
2.2.1.1. The formula for determining the main parameters of transmission. 20
2.2.1.2 Materials gears. 20
2.2.1.3 Permissible contact stress. 20
2.2.1.4 The initial parameters for the calculation. 22
2.2.1.5 The calculated ratios 22
2.2.1.6. Wheelbase module teeth 22
2.2.2 The main characteristic dimensions of gear rims and additional design parameters of the transmission. 23
2.2.2.1 In accordance with GOST 13755-81 parameters for cylindrical gears. 23
2.2.2.2 The dimensions of gear rims 23
2.2.2.3 Additional current rate 24
2.2.3 Defining the parameters and calculations on the active surfaces of the contact endurance of teeth 24
2.2.3.1 The calculated ratios 24
2.2.3.2 Specific design circumferential force 25
2.2.3.3 The value of the permissible contact voltage is not specified 25
2.2.3.4 Calculation on the contact endurance 25
2.2.4 Defining the parameters and calculations on the contact strength of the active surfaces of the teeth by the action of the maximum load 26
2.2.4.1 Permissible limit contact voltage. 26
2.2.4.2 Calculation on contact strength by the formula 26
2.2.5 Definition of parameters and calculation of endurance in bending the teeth 26
2.2.5.1 The calculated ratios 26
2.2.5.2 Specific design circumferential force 27
2.2.5.3 Permissible bending stress fo