Machine Detail Course Design - Design of Two Stage Gearbox Assembly

Contents

Contents

Introduction

1. Calculation of machine working element

1.1 Determination of rope diameter

1.2 Determination of drum diameter and length

1.3 Determination of drum speed

1.4 Gear ratio of the drive

1.5 Moment on winch drum

1.6. Moment on low-speed gear wheel

1.7.Validable contact voltages

1.8 Relative wheel width factors

1.9.Equivalent operating time

1.10.Gearbox transmission codes

2 Analysis of the obtained data and selection of the optimal gearbox layout

2.1 Selection of optimal gearbox layout

2.2 Determination of output shaft diameter

2.3 Assembly and lubrication condition

3. Evaluation of lubrication conditions and selection of gearbox gear lubrication method

4. Gearbox Gear Geometrical Calculation

4.1 Calculation of low-speed chevron stage

4.2 Calculation of high-speed spur stage

5. Static gearbox survey

5.1 Determination of torque

5.2 Determination of forces in engagement

6. Kinematic calculation of reduction gear box

6.1 Determination of rotation speeds

7. Check calculation of gear train of slow-moving and high-speed stages

7.1 Purpose of material and heat treatment of gears

7.2 Definition of allowable contacts and bending stresses

7.3 Determination of actual contact and bending stresses

7.4 Output of gear train operability

8 Development of draft design of reduction gear box

8.1 Determination of shaft diameters

8.2. Selection of bearings

9 Calculation of intermediate shaft strength

9.1 Determination of forces acting on the shaft

9.2. Intermediate shaft design diagram

9.3. Defining Intermediate Shaft Bearing Life

10. End sections of shafts:

11. Calculation of keys

12. Design of Bearing Covers

13. External gearing gears

14 Calculation of deviations of dimensions and tolerances of shape of intermediate shaft and gear wheel of high-speed stage

14.1 Calculation of deviations of dimensions and tolerances of intermediate shaft shape

14.2 Calculation of deviations of dimensions, tolerances of high-speed gear wheel shape

14.3 Calculation of the total normal length of the gear of the high-speed stage and the gear of the slow-speed stage

15. Cuff seals

16. Lubricating devices

17. Design of housing parts and covers

18. Attachment of the cover to the housing

19. Designing Other Gearbox Elements

20. Lubrication system selection

21. Gearbox Assembly Brief

22 Drive Station Layout

22.1 Coupling selection

22.2 Construction of Drive Station Plate

23. Sketches of Standard Products

List of sources used

Introduction

The lifting machine drive is designed to transmit torque to the drum, which provides lifting of the load at a speed of 0.65 m/s.

Lifting machine drive (Fig. 1) consists of electric motor, reduction gear box, drum, rope. Electric motor is connected to reduction gear by means of coupling. Lifting of load is performed by rope, which is wound on drum. Drum is driven by electric motor through reduction gear and clutch. Reduction gear increases torque and reduces rotation speed to required value.

Reduction gear consists of high-speed spur gear and slow-speed chevron gear. Lubrication of gears and bearings is performed by spraying.

Lubrication system selection

This gearbox uses a crankcase lubrication system, i.e. the housing is an oil tank. Oil is poured through the upper hatch. For oil drain in the housing there is a drain hole closed by a plug.

During operation of the transmissions, wear products gradually contaminate the oil. Over time, it ages, its properties deteriorate. The defective features are the increased water content and the presence of mechanical impurities. Therefore, the oil poured into the body is periodically changed .

Depending on the contact voltage up to 600 MPa and the circumferential speed of the wheels up to 2 m/s, we determine the required viscosity of the oil 34 * 10 m ²/s. By viscosity, we determine the brand of oil - industrial oil I-G-A. Required amount of oil V = 12 l.

Gearbox Assembly Brief

This gearbox design allows independent gearbox assembly. First of all, gears, then thrust bushings, bearings, adjusting rings are installed on the shafts, which provide adjustment of axial clearances, and oil reflectors. Then collars and bearing covers with holes for shaft ends are installed. Then shafts, as well as blind covers are installed in the housing. A cover is installed on the housing, which is fixed by pins, then the cover is attached by tightening bolts. Oil indicators and drain plug are installed on the housing. Then oil is poured into body through hole of hatch. After that, the hatch cover is installed on the housing cover.

Conclusion

We performed the necessary algorithm of actions aimed at developing the design of gearboxes of general-purpose drives. Directly familiarized with the algorithm for creating a sketch design as a basis for further work on creating design documentation, which is the main task of performing calculation and graphics work in the discipline "Machine Parts and Design Basics."