Winch Drive, Worm Gear Single Stage Explanatory Note to Course Design on Machine Parts Course

Contents

Contents

Introduction

1 KINEMATIC AND POWER CALCULATIONS OF DRIVE. MOTOR SELECTION

1.1 Development of kinematic diagram

1.2 Determination of actuator shaft power

1.3 Determination of actuator shaft speed

1.4 Determination of design power on the motor shaft

1.5 Determination of motor shaft speed

1.6 Selection of electric motor

1.7 Determination of gear ratio of engine and reduction gear box

1.8 Determination of power, torque and rotation speeds of shafts

1.9 Calculation of reduction gear box on computer

1.10 Selection of optimal gearbox calculation option

2 WORM GEAR CALCULATION

2.1 Materials and heat treatment of gears

2.2 Permissible contact stresses when calculating endurance of active tooth surfaces

2.3 Clarification of power and kinematic parameters of the drive

3 GEARBOX WORM GEAR GEOMETRICAL CALCULATION

3.1 Geometric parameters of gears

3.2 Selection of the degree of accuracy

4 CHECK CALCULATION OF WORM GEAR FOR CONTACT ENDURANCE OF ACTIVE SURFACES OF TEETH

4.1 Refine Load Factor

4.2 Actual Contact Voltages

4.3 Permissible stresses when calculating worm gear teeth for bending endurance

4.4 Check calculation of worm gear for endurance of teeth by bending

4.5 Worm Gear Strength Calculation

short-term overloads

4.6 Worm Gear Engagement Forces

4.7 Calculation of the worm for stiffness

5 GEARBOX LUBRICATION

6 APPROXIMATE CALCULATION OF GEARBOX SHAFTS

6.1 Determination of shaft diameters

6.2 Approximate calculation of shaft

6.3 Fatigue Strength Calculation

6.4 Worm Wheel Design

7 DESIGN OF BEARING ASSEMBLIES

7.1 Bearing Assignment

7.2 Determination of load bearing forces

7.3 Selection of bearings by dynamic lifting capacity

8 SHAFT-HUB CONNECTIONS

8.1 Keyway connections

9 GEARBOX HOUSING DESIGN

10 CALCULATION OF BELT TRANSMISSION ON A COMPUTER

11 DESIGN OF THE EXECUTIVE BODY

11.1 Determination of actuator shaft diameters

11.2 Calculation of actuator shaft strength

11.3 Check calculation of low-speed shaft bearings

11.4 Selection of keys for actuator shaft

12 COUPLING DESIGN

12.1 Coupling Selection and Justification

12.2 Calculation of disc friction coupling

12.3 Check calculation of elastic bushing-finger coupling

Literature

Introduction

The purpose of this course project is to design the winch drive based on a comprehensive specification. The drive includes an electric motor connected by means of a belt gear to a worm single-stage reduction gear, which, in turn, by means of a combined coupling, is connected to the shaft of the actuator.

Within the framework of this course design, calculation and selection of the required electric motor, design calculation of the gearbox on the computer, check calculation of the gearbox, calculation of the low-speed shaft of the gearbox for fatigue strength, calculation of bearings on this shaft for dynamic lifting capacity, calculation of the strength of key connections, calculation of the gear-friction coupling and actuator are carried out.

The electric motor used in the drive is 3-phase asynchronous.

The combined (UVPF) coupling is used to compensate for inaccuracies in the installation of shafts and to limit loads in the drive.

Worm single-stage reduction gear is designed for power transfer between shafts of electric motor and actuator.

The belt gear serves to transfer motion with an increase in torque from the engine to the reduction gear box.

The actuator is a drum.