Planetary two-stage reduction gear

Contents

INTRODUCTION

1. INITIAL DATA AND GEARBOX LAYOUT DIAGRAM

2.KINEMATIC AND POWER CALCULATION

Slow-moving stage

High speed stage

3. CALCULATION OF PERMISSIBLE STRESSES FOR ENGAGEMENT a-g

Contact voltages

Bending stresses

4. PRELIMINARY DETERMINATION of the SIZES of COGWHEELS a1 And yes

Preliminary Wheel Sizing

Calculation of wheel diameters based on contact strength

Calculation of wheel diameters based on flexural strength

Adjusting the number of teeth and the working width of gears

5. RESULTS OF CALCULATION OF GEARS DIMENSIONS

6.SELECTION OF STEEL GRADE AND HARDENING TREATMENT FOR WHEELS b1 AND b

7. CONSTRUCTION OF SATELLITE ASSEMBLY

Satellite Bearing Calculation and Selection

Material Selection and Pinion Axis Strength Check

8.CONSTRUCTION OF HIGH-SPEED GEAR SHAFT ASSEMBLY

Material Selection and Settlement Scheme

Define reactions in supports and create curves and torques

Shaft Strength Check

Calculation and selection of shaft bearings

9.CONSTRUCTION OF COUPLING ASSEMBLY

Floating Wheel Design a

Coupling Design

Selection of fastening bolts for internal half-coupling

10.CONSTRUCTION OF LOW-SPEED STAGE SHAFT-CARRIER ASSEMBLY

Material Selection and Settlement Scheme

Define reactions in supports and create curves and torques

Shaft Strength Check

Calculation and selection of shaft bearings

11. CALCULATION OF KEY CONNECTIONS

Prismatic keys on input and output shafts

Cylindrical keys for attachment of central wheels b1 and b

12. CALCULATION OF GEARBOX ATTACHMENT TO FRAME

Calculation diagram

External Load Factor Calculation

Check of joint opening

Strength check of foundation bolts

13. DETERMINATION OF FRICTION LOSSES AND GEARBOX EFFICIENCY

Determination of friction losses in engagement

Determination of friction losses in bearings

Total gearbox loss factor and efficiency

14. SELECTION OF DRIVE MOTOR AND ITS OVERLOAD CHECK

Engine selection

Engine overload check

15. LUBRICATION SELECTION AND THERMAL CALCULATION

Grease Selection

Thermal calculation

16. List of literature

Introduction

The main design objects for the course "Machine Parts" are

mechanical gears for converting rotational movements or

rotational motion into translational motion.

The purpose of this course project is to develop among students

skills in design of mechanical units, evaluation of methods

design, design of couplings, gears and other components.

This work consists of several parts, namely calculation -

explanatory note and graphic part. Calculation and explanatory

The note consists of several steps, such as an explanatory note,

where preliminary calculation of gearbox parameters is presented,

check calculation, where the calculation is carried out, as well as data verification,

calculated at the first stage of the course project. Also this work

includes selection of electric motor by parameters of reduction gear box, calculation

base plates and design of connecting coupling.

The graphic part of the task is a drawing of the gearbox view,

general view of reduction gear box assembled with electric motor. To graphic work

attached is the gearbox specification.