Individual drive design

Contents

Introduction

Chapter 1. Electric motor selection. Kinematic and power calculation of the drive

Chapter 2. Calculation of cylindrical gears

Chapter 3. Determining the Magnitude and Direction of Forces Engaged

Chapter 4. Shaft sizing and rolling bearing calculation

Chapter 5. Calculation of keys

Chapter 6. Calculation of driven shaft in section under gear wheel for fatigue strength

Chapter 7. Couplings

Chapter 8. Selection of engagement lubricant and bearings

Chapter 9. Calculation of gearbox basic dimensions

Chapter 10. Selection of fits for coupling of main parts of reduction gear box

Chapter 11. Bearing Control

Conclusion

Bibliographic list

Application

Introduction

The designed individual drive consists of an asynchronous motor of the IM1081 design, an elastic coupling connecting the motor shaft with the high-speed shaft of the cylindrical reduction gear box. Flexible clutch is mounted on low-speed shaft of reduction gear. Drive is installed on welded frame. The executive mechanism is not considered in this project.

Chapter 7. Couplings

Selection of coupling for connection of electric motor and reduction gear box shafts.

Since the coupling connects relatively fast shafts, in order to reduce starting and other dynamic loads, it must have a moment of inertia and elastic properties.

On the first shaft we install an elastic bushing-flange clutch.

Flexible couplings are designed to soften dynamic loads transmitted through shafts.

They are widespread due to the relative simplicity of the design and the convenience of replacing elastic elements. However, they have little compensating ability, and when connecting the misaligned shafts, they exert a fairly large force on the shafts and supports, while the rubber bushings quickly fail. Since they have great radial and angular rigidity, they are used in the installation of connected products on frames of great rigidity. Assembly shall be done with high accuracy and gaskets shall be used to ensure alignment of the shafts to be connected.

CHAPTER 10. Selection of fits for coupling of main parts of reduction gear box

10.1 Selection of fits in shaft-hub connection

When transmitting the torque by the key connection, the use of wheel fits on the shaft with a gap is unacceptable, and transient fits are undesirable. If there is a gap in the joint, then when the shaft rotates, the surfaces of the shaft and the wheel hole slide, which leads to wear. Therefore, when the moment is transmitted by the key, an interference should be created on the mounting surfaces of the shaft and the wheel hole, ensuring that the joint is not opened.

H7/r6 landing recommended for cylindrical helical and worm gears

When mounting gears to the interference shafts, it is very difficult to align the wheel key slot with the shaft key. To facilitate assembly, it is recommended to provide a guide cylindrical shaft section with a tolerance field d11.

[2, p. 82]

10.2 Selection of fits in key connection

Key fits are regulated by GOST 2336078 for prismatic keys. Width of prismatic key is made along h9. recommend taking the following dimension tolerance fields:

Width of shaft keyway for prismatic key as per P9

Width of hole keyway at fixed connection of non-reversible transmission as per Js9

[2, p. 82]

10.3 Selection of bearing fits

Deflections of casing hole and housing cover for external rings of bearings are made with deviation along H7. Tolerance fields for hole diameter and external bearing diameter are assigned to L0 and l0 respectively (normal accuracy class). Deflection of the shaft for the inner bearing ring by k6 as the most recommended.

Other landing as per recommendations [2]

Chapter 11. Bearing Control

When adjusting both the axial position of the wheels and bearings, the same gaskets are used. First, bearings are adjusted to define total set of gaskets with thickness and between reduction gear box housing and cover flange. Then, axial position of wheels is adjusted by shifting gaskets from one side to the other.

[8, p. 298]

Conclusion

When performing this course work, all the necessary calculations of the designed products were made, as well as their drawings. This course project allows you to test theoretical knowledge and learn practical design skills, as well as the ability to practically perceive the results.