Course design for parts of machines with specification

Contents

Contents

1 Purpose and brief description of the drive

2 Electric motor selection

3 Gearing calculation

3.1 Selection of Gear Material

3.2 Determination of stress contacts

3.3 Determination of allowable bending stresses

3.4 Permissible voltages at short-term load

3.5 Design dimensions and parameters

3.6 Test calculation by contact voltages

3.7 Check calculation for bending stresses

3.8 Check calculation for G-load

4 Determination of forces in engagement

5 Design and verification calculation

5.1 Sizing Shaft Steps

5.2 Design diagram of high-speed shaft

5.3 Design diagram of low-speed shaft

6 Selection and calculation of bearings

6.1 Selection and calculation of high-speed shaft bearings

6.2 Selection and calculation of low-speed shaft bearings

7 Selection of fits for coupling of main parts of reduction gear box

8 Coupling selection and check calculation

9 Check calculation of shafts

9.1 Sources of stress concentration in hazardous sections

9.2 Normal voltages

9.3 Tangent Stresses

9.4 Concentration factor of normal and tangent stresses for design shaft section

9.5 Endurance limits in shaft design section

9.6 Safety factor for normal and tangent stresses:

9.7 General safety factor in hazardous section

10 Check calculation of key connections

11 Check calculation of tightening screws of bearing units

12 Sizing of gearbox main elements

13 System selection, grade assignment and quantity of engagement lubricant and bearings

14 Description of gearbox assembly technology and adjustment of its main units

Bibliographic list

1 Purpose and brief description of the drive

Cylindrical reduction gear is used to transfer motion between parallel axes. Their design is very diverse. Their main merit is that they have a high efficiency. This figure is 98%, since there is practically no loss on rotation. Cylindrical reducers have a rather low operating temperature, which allows the transfer of energy directly from the source to the storage.

Thanks to their positive performance, cylindrical gearboxes have found their use in: mechanical engineering, automotive. Gearboxes are used in drives of equipment using shafts. Stirrers, extruders, grinders, metal machines and other equipment.

In the course design, a test plant drive is designed, which includes a single-stage cylindrical reduction gear, which serves to increase the torque of the drive while reducing the speed from the input shaft to the output shaft. Input shaft of reduction gear is connected to electric motor. The electric motor provides the drive necessary for the reduction gear to achieve a given gear ratio with a rotation frequency.