Passenger car of the 4th (large) class with the design of a variator

Contents

Terms of Reference

Introduction

1 Design selection and justification

2 Selection of prototypes

3 Calculation of transmission gear ratios

4 Construction of the traction characteristic of the car

5 Calculation of variator pulleys

5.1 Design Torque

5.2 Determination of minimum and maximum diameter of pulleys

6 Calculation of planetary mechanism

6.1 Initial data for calculation

6.2 Design parameters

6.3 Calculation of wheel teeth for contact endurance of active surfaces

6.4 Calculation of wheel teeth for bending endurance

7 Design calculation of shaft

7.1 Shaft Loads

7.2 Calculation of shaft for static strength

8 Calculation of splined joint

8.1 Calculation of splined joint for strength

8.2 Calculation of splined joint for wear and tear

9 Shaft check calculation

10 Calculation of driven shaft bearings

11 Calculation of joint of equal angular velocities

12 Variator assembly

13 Economic justification of the project

Conclusion

Bibliographic list

Technical assignment for the designed vehicle

1. Introduction

1.1. Name

Passenger car of the 4th (large) with the design of a variator.

2. Grounds for development

2.1 Document for the basis of development: Assignment for course design in the discipline "Design and calculation of a car and a tractor"

2.2 Organization: UrFU MMI Department "Machine Parts" section "Automobile and Tractor Building"

2.3 Development theme symbol:

Front-wheel drive vehicle variator.

3. Purpose of development:

Passenger car of the 4th class of increased comfort (executive class).

4. Product Requirements

4.1 Requirements to functional characteristics:

- automatic adjustment of gear ratio;

- possibility of car movement at different engine modes;

- easy control of the transmission.

4.2 Reliability Requirements:

- minimum car mileage to overhaul 100000 km;

- ensuring reliable transmission of torque throughout the minimum mileage.

4.3 Operating Requirements

- pavements: asphalt, soil, gravel, icy road, snow, sand.

4.4 Requirements to the composition and parameters of the article.

- a car with a 4x2 wheel formula;

- transmission - front-wheel drive with variator;

- variator is equipped with selector for manual control;

- maximum speed (not lower than) 200 km/h;

- engine volume 3.5 - 5 liters (passenger car of the 4th class of the car)

Introduction

In the discipline "Design and calculation of a car and a tractor," the main design issues of units, systems and assemblies of ground vehicles are considered.

The purpose of the course design is to master the basis of design and calculation of the main components of the vehicle transmission, as well as the development of design documentation.

The following skills need to be learned:

to study modern solutions in the field of transmission design;

Study and use standards and regulations in the design of components;

be able to assess the impact of design changes on operating parameters and on the cost of the vehicle, evaluate the feasibility of making design changes;

own methods for calculating the main elements of the vehicle transmission, be able to evaluate the results obtained during the calculations;

be able to technically competently execute drawings;

Design Selection and Justification

In the modern automotive industry, cars with automatic transmission, in particular with variators, are gaining increasing popularity.

The variator is a stepless gearbox (hereinafter referred to as CP) with a flexible link in the form of a belt or chain. The main advantage of the variator over other CPs is the efficient use of engine power due to the optimal matching of the load on the car with the crankshaft speed, thereby achieving high fuel economy or high dynamics, as well as a continuous change in torque, no jerks, a high level of comfort when driving the car.

This course project sets out the calculation of a 4th class passenger car of increased comfort (representative class) with a chain variator. The choice of the circuit as a flexible element is due to its high load capacity and variator resource as a whole.

Selection of prototypes

The vehicle to be calculated shall meet the following requirements:

Maximum speed not less than 230 km/h;

The pavement is predominantly asphalt in satisfactory condition;

Engine displacement 3.55 l;

For calculation, the Audi A8 4.0 TFSI car was chosen as a prototype.

Audi A8 4.0 TFSI Specifications:

Engine characteristics

Engine type.........................................................................................................................................................................................................

Working volume, cm ³................................................................................. 2995

Max. power, hp at rpm.................................... 310/5100-6000

Max. torque, Nm at rpm.......................... 440 / 2900 - 4750

Dynamic characteristics

Maximum speed, km/h.......................................................... 250

Acceleration time 0100 km/h, sec. 5,7

Transmission

Drive type................................. Quattro ® Permanent Four Wheel Drive

Gearbox..................................................................................................................... 8-speed tiptronic

Mass characteristics and mass of towed trailer

Own weight, kg.................................................................. 1905

Permissible total weight, kg............................................................................................................. 2520

For the calculated car, we choose the Honda 3.5 V6 SOHC VTEC engine (6-cylinder, V-shaped, 24-valve, with a single upper camshaft, a light alloy cylinder block with a variable cylinder control system (Variable Cylinder Management).

Engine specifications Honda 3.5 V6 SOHC VTEC:

Maximum power, hp/v. min...................................... 281/6200

Maximum torque, Nm/v min. 342/4900

Engine displacement, cm3................................................................3471

Extent of compression....................................................................................10.5

Cylinder diameter, mm.................................................................. 89

Piston stroke, mm............................................................................... 93

Audi Multitronic 01J variator was chosen as the prototype.

Technical specifications of Multitronic 01J variator:

Designation.......................................................................... Multitronic 01J

Factory designation......................................................... VL 30

Maximum transmitted torque............................ 310 Nm

Variator ratio range........................... 2,400.40

Range of gear ratios

(partial maximum and minimum

ratios).............................................................................. 6

Intermediate gear ratio..................... 51/46 = 1.109

Main gear ratio................................. 43/9 = 4,778

We will accept the following technical data for calculation:

As a clutch, packages of frictional disks of the planetary series are used;

The reverse stroke is provided by a planetary row;

The gear ratios when moving forward and backward in the planetary series are 1;

The main transmission is hypoid with a gear ratio of 4.5.

Conclusion

As a result of the course work, a 4th class car with a variator was calculated.

During the course work, the goals were achieved.

to study modern solutions in the field of transmission design;

Study and use standards and regulations in the design of components;

be able to assess the impact of design changes on operating parameters and on the cost of the vehicle, evaluate the feasibility of making design changes;

own methods for calculating the main elements of the vehicle transmission, be able to evaluate the results obtained during the calculations;

be able to technically competently execute drawings;

During the course project, the software on the Personal Computer was widely used:

MS Word;

MS Excel;

COMPASS-3D V14.

As a result of the calculations, a variator was designed, which corresponds to the technical assignment .