Gearbox consisting of two cylindrical gears

Contents

1. Energy, kinematic calculation of the drive

1.1. Energy calculation and selection of engine type

1.1.1.Power required for escalator drive

1.1.2. Selection of engine speed

1.1.3. Selection of engine type

1.2.Kinematic calculation of the drive

1.3. Total gear ratios of the drive

1.4. Kinematic calculation

1.5. Power calculation of the drive

Gearing Calculation

2.1. Calculation of oblique transmission

2.1.1.Selection of materials and method of hardening

2.1.2.Compute allowable contact voltage

2.1.3.Selection of calculated coefficients

2.1.4. Design calculation of transmission

2.1.5. Check calculation for fatigue contact strength

2.2. Spur Low-Speed Transmission

2.2.1.The initial data

2.2.2. Calculation of allowable contact stress

2.2.3. Selection of calculated coefficients

2.2.4. Design calculation of transmission

2.2.5. Check calculation for fatigue contact strength

3. Orientation calculation

3.1. Intermediate shaft

3.2.Typed shaft

4. Selection and calculation of rolling bearings

4.1. Input shaft bearings

4.2. Intermediate shaft bearings

4.3. Low-speed shaft bearings

5. Refined Shaft Calculation

5.1. Input (high-speed) shaft

5.2. Input (high-speed) shaft

5.3. Slow-moving shaft

6. Calculation of combined elastic-safety coupling

Literature

Task

Design a gearbox consisting of two cylindrical gears.

Additional data to escalator:

- step of a chain of escalator P =101.8 of mm;

-angle of inclination to horizon α = 30 °;

- performance W = l 250 people/h;

- speed of motion V = 0.8 m/s;

- escalator length L = 8 m;

-number of teeth of leading star Z = 10;

- movement resistance coefficient C = 1.2;

- daily usage factor Ks = 0.6;

-use factor annual Kg = 0.3;

-service t = 4 years.

Gearing Calculation

2.1. Calculation of oblique transmission.

Source Data

- power on the gear shaft P1 = 4.25 kW;

- gear speed n1 = 965 rpm;

- wheel speed n2 = 172 .32 rpm;

- torque on the gear shaft T1 = 42.04 n * m.

2.1.1.Selection of materials and method of hardening.

For the wheel, heat treatment - improvement, hardness HB269... 302 (accept HB270). For pinion heat treatment - improvement and surface quenching of TVH, core hardness HB270, surface hardness HRC48... 53 (accept HRC50) in order to use the head effect and obtain higher load capacity

2.2. Spur Low-Speed Transmission

2.2.1.The initial data:

- power on the gear shaft P1 = 4.12 kW;

- gear speed n1 = 172.32 rpm;

- wheel speed n 2 = 38 .29 rpm;

- torque on gear shaft T1 = 228.34 n * m

For the wheel heat treatment - improvement, hardness HB = 235... 272

(accept HB270).

For the gear, heat treatment - improvement, hardness HB269... 302,

(accept HB290).