Single-stage cylindrical vertical reduction gear box

Contents

Introduction

1. Electric motor selection. Calculation of the main kinematic and energy parameters of the drive

1.1. Calculation of electric motor power

1.2. Calculation of synchronous speed of motor shaft

1.3. Motor grade selection and rated speed calculation

1.4. Calculation of total gear ratio, gear and belt gear ratios

1.5. Calculation of shaft speeds

1.6. Calculation of capacities and torques on geared gear shafts

2. Gearing Calculation

2.1.1. Calculation of allowable contact stresses

2.1.2. Calculation of allowable bending stresses:

2.2. Calculation of gear parameters

2.2.1. Calculation of center distance:

2.2.2. Calculation of engagement module, total number of teeth, tooth inclination angle, gear and wheel teeth numbers, actual gear ratio

2.2.3. Calculation of the circumferential transmission speed and selection of the degree of accuracy of its manufacture

2.2.4. Calculation of wheel width

2.3. Transmission check calculation

2.3.1. Check of contact strength of teeth

2.3.2. Calculation of bending strength of teeth

3. First stage of gearbox sketching

3.1 Gearbox housing transmission arrangement

3.2 Shaft Layout

3.2.1.Compute shank diameters

3.2.2.1Shaft

3.2.2.2. High speed shaft

3.3 Preselection of bearings

3.3.1.Valve shaft

3.3.2 Slow-motion shaft

3.4 Arrangement of bearings in the gearbox housing is determined by dimensions of bearings and method of their lubrication

3.5 Calculation of distances between points of engagement forces application and bearing supports

4. Selection of couplings and strength calculation of key joints

4.1 High speed shaft

4.1.2 Slow-moving shaft

5. Calculation of shafts

5.1 Calculation of forces in gear engagement

5.2 Calculation of support reactions and stresses in hazardous sections

5.2.1 Output shaft

5.2.1.1. Vertical plane

5.2.1.2. Horizontal plane

5.2.1.3. Calculation of maximum values of support reactions and bending moments. Dangerous section selection and stress calculation in dangerous section

5.3. Refined shaft calculation

6. Calculation of theoretical durability of bearing supports

High speed shaft

7. Calculation of dimensions of gearbox housing elements for the second stage of sketched layout

7.1. Calculation of bearing socket depth

7.2 Calculation of distances from axes of bolts d2 to axes of shafts and to internal walls of reduction gear box housing

7.3Compute the width of the flanges connecting the base and cover of the reduction gear box housing and the distance from the axes of bolts d3 to the inner wall of the reduction gear box housing

7.4 Calculation of gearbox support flange width and distance from the axes of bolt holes dδ1 to the inner wall of the housing

Bibliographic list

Introduction

A reduction gear is a mechanism made in the form of a separate unit, which serves to reduce the angular speed and, accordingly, increase torques. The gearbox is an integral part of modern equipment. In general-purpose drives developed during course design, the reduction gear is the main and most labor-intensive unit.

The arrangement of the engagement gears in a separate closed housing guarantees sufficient mounting accuracy, good lubrication and correspondingly high efficiency, less wear and tear, as well as reliable protection of the gears from environmental influences. Gearboxes of various types with a constant gear ratio are widely used in all sectors of the economy. The most common are gearboxes consisting of cylindrical gears.

The reduction gear consists of a body (cast iron or welded steel), in which the transmission elements are placed - gears, shafts, bearings, etc.

The following calculations are performed in the course design:

1. Main kinematic and energy parameters of the drive

2. Design and check calculation of gears

3. Shaft calculation

4. Calculation of key connections

5. Calculation of theoretically durable bearing supports.

Based on theoretical calculations, gearbox assembly drawings with specification and detailed drawings of several parts are performed.