Bypass gearbox of the flap control system

Assignment E-11. "Auxiliary Gearbox of the Flap Control System"

Variant 2

The course project includes:

1. Calculation and explanatory note
2. Assembly drawing of the gearbox
3. Specification for the assembly drawing
4. Drawing of the output shaft

Contents of the calculation and explanatory note for the course project:

1. Purpose and technical description of the mechanism. 3

2. Initial data. 4

3. Design calculation of the gear transmission. 5

3.1. Selection of material for the gears. 5

3.2. Selection of the relative width of the gear rim. 6

3.3. Selection of the accuracy grade of engagement. 6

3.4. Selection of tooth shape. 6

3.5. Determination of the number of teeth of gear z1 and the gear ratio. 6

3.6. Determination of the limiting contact stresses on the tooth surfaces. 7

3.7. Determination of the allowable contact stress. 8

3.8. Determination of the coefficients KHα , KHβ, KHV and the function f(β), included in the formula for determining the center distance. 8

3.9. Determination of the center distance of the cylindrical gear transmission in the first approximation. 9

3.10. Determination of the gear module. 9

3.11. Determination of the main geometric dimensions of the gear transmission. 9

4. Power calculation. 10

5. Verification calculation of the gear teeth for contact strength. 11

5.1. Determination of coefficients ZH, ZM, ZE. 12

5.2. Specific calculated circumferential force in determining contact stress. 12

5.3. Determination of calculated contact stresses. 12

5.4. Verification of contact strength of the teeth. 12

6. Verification calculation of the gear transmission for the bending strength of the teeth. 13

6.1. Determination of the calculated bending stress sF at the base of the teeth of the gear and wheel. 13

6.2. Determination of allowable bending stresses in the calculations at the points of the teeth of the gear and wheel sFp1, sFp2. 15

6.3. Verification for bending strength. 16

7. Design calculation of the shafts. 16

7.1. Determination of the diameter. 16

7.2. Selection of bearings. 17

8. Verification calculation of the input shaft. 17

8.1. Determination of loads acting on the shaft. 17

8.2. Construction of the bending and torsional moment diagrams of the shaft. 18

8.3. Determination of stresses in the critical section. 19

8.4. Determination of the safety factor. 20

8.5. Calculation of bearings for durability. 21

8.6. Verification calculation of the connection for torque transmission. 22

9. Verification calculation of the output shaft. 22

9.1. Determination of loads acting on the shaft. 22

9.2. Construction of the bending and torsional moment diagrams of the shaft. 23

9.3. Determination of stresses in the critical section. 24

9.4. Determination of the safety factor. 25

9.5. Calculation of bearings for durability. 26

9.6. Verification calculation of connections for torque transmission. 27

10. List of references.. 28