Mercedes Benz gearbox calculation

Contents

Paper

Contents

Introduction

1. Design Input

2. Calculation and construction of engine external speed characteristic

3. Transmission Design

3.1.Define gearbox and gearbox gear ratios

3.2 Development of transmission kinematic diagram

3.3 Determination of gearing parameters of the gearbox

3.3.1. Determination of gear wheel gear numbers

3.3.2. Gearbox Gear Module Selection

3.3.3. Gearbox Strength Calculation

3.3.4. Development of working drawing of one of gears

3.4 Selection of gearbox shaft diameters and strength calculation

3.5 Selection of gearbox bearings

4. Calculation of traction-dynamic parameters of the car

4.1 Power balance of the car

4.2 Dynamic Car Passport

4.2.1. Building the dynamic characteristic of the car

4.2.2 Construction of load nomogram

4.2.3 Slip Check Schedule

4.3 Evaluation of vehicle acceleration

4.3.1. Definition of vehicle acceleration

4.3.2. Determining the time and path of acceleration of the car

5. Special. question

6. Conclusion and conclusion

7. Bibliographic list

Introduction

In our time, road transport is very important; in terms of cargo and passenger transportation, transport occupies the first place.

The car park of our country is constantly growing every day.

Much attention is paid to the organization of passenger and cargo transportation in cities and settlements. Measures are being taken to increase the fleet of passenger and freight transport, to improve the quality of service to the population. Advanced methods of maintenance management and repair in road transport are being implemented.

With the increase in the volume of production of cars, their designs and operational properties improve. The operation of the car is greatly influenced by the units and units of the transmission, the repair of units and units is time-consuming and expensive. One of the main indicators of the units and assemblies is their durability, determined by wear in operation before failure or wear of individual parts or completely the unit. The cost of units and assemblies is about 2025% of the total cost of the car. Therefore, the issue of extending the service of units and assemblies is very significant. Increasing the service life of units and assemblies helps reduce capital costs in road transport, saving scarce and expensive materials.

1. Design Input

Type of car - passenger;

Engine type - carburetor;

The maximum engine power is 146 kW;

at crankshaft speed - 500 rad/s;

The number of gearbox stages is 5 tbsp.;

The number of gearbox shafts is 2;

The gear ratio of the highest gear is 0.7;

Wheel radius - 325 mm;

The maximum speed of the car is 135 km/h;

The total weight of the car is 12.8 kN;

Number of passengers - 4;

The loaded weight of the car is 8.5 kN;

Driving bridge - rear;

Weight on the rear axle at full load of the car - 6.5 kN;

Weight on the rear axle with a loaded car - 5 kN;

Maximum road resistance coefficient - 0.5;

The largest width of the car is 1.45 m;

The height of the car is -1.45 m;

Type of pavement - asphalt concrete highway in satisfactory condition.

6. Conclusions and conclusions

In the work, a car transmission was designed with the definition of traction dynamic parameters, for which tables were compiled and graphical dependencies were built. A detailed development of the gearbox design has been carried out. The development includes the design and testing for the strength of gears and shafts, the development of a layout scheme, as well as the selection of bearings for durability .

Calculations have shown that all parameters under investigation meet safety requirements and do not exceed permissible parameters. Therefore, it can be concluded that the designed transmission is suitable for further research and checks .