Motorcycle Engine Design - DBE Drawings

Contents

Table of contents

Introduction

Brief description of motorcycle mechanisms

Source Data for Calculation

1. SHEET 1: Involute Gear Synthesis

1.1. Source Data

1.2. Setting the task

1.3. Involute transmission calculation algorithm

1.4. Gearing Calculation Results

1.5. To Select an Offset Factor

1.6. Construction of the designed gear train

1.7. Building Evolvents

1.8. Machine engagement

1.9. Graphical definition of the overlap factor

1.10. Conclusions

2. SHEET 2: Planetary Reduction Gear Synthesis

2.1. Source Data:

2.2. Task setting:

2.3. Main Design Conditions for Multi-Satellite Planetary Gear Box

2.4. Selection of gear numbers of planetary reduction gear box

2.5. Graphical check of gear ratio

2.6. Conclusions

3. SHEET 3: Dynamic Examination of the Main Mechanism

3.1. Source Data

3.2. Task setting:

3.3. Design of crank-slider mechanism

3.3.1. Calculation Procedure

3.3.2. Mechanism synthesis and calculation results

3.4. Forces and moments acting on the links of the mechanism

3.5. Defining Dynamic Model Parameters

3.5.1. Determination of total reduced moment

3.5.2. Determination of total reduced moment of inertia

3.6. Definition of transfer functions

3.6.1. Definition

3.6.2. Definition

3.6.3. Definition

3.6.4. Definition of transfer functions

3.7. Plot the given moment

3.8. Construction of the reduced moment of inertia of the second group of links

3.9. Draw an approximate graph

3.10. Flywheel Calculation

3.10.1. Determination of required moment of fly masses

3.10.2. Determination of moment of inertia of additional fly mass

3.11. Determining the law of movement of the initial link of the mechanism

3.12. Conclusions

4. SHEET 4: Cam Mechanism Synthesis

4.1. Input and Task Setting

4.2. Building kinematic diagrams

4.3. Building an Auxiliary Chart

4.4. Cam Profiling

4.5. Check of transfer functions

4.5.1 Construction of replacement mechanism

4.5.2 Speed transfer function check

4.5.3 Check of acceleration transfer functions

4.6. Conclusions

5. List of literature

Involute Gear Synthesis

Source Data

by instrument, m = 4.25mm, and C * = 0.25; the initial outline of the tool is rack ;

on wheels Z1 = 14, Z2 = 25 and.

Setting the task

calculate involute gear train;

select a displacement factor at which all conditions of normal operation of the gear train are met;

build a designed gear train;

check graphically the overlap factor;

build a machine engagement for wheel Z1;

Synthesis of planetary reduction gear box

Source Data:

The mechanism scheme is a single-row planetary reduction gear with mixed engagement .

all wheels have the same module mm;

gear ratio of planetary reduction gear (gear ratio goes from wheel to carrier); number of planetary reduction gear satellites;

Task setting:

It is necessary to select the numbers of teeth of the wheels of the planetary reduction gear that satisfy all the conditions imposed on the multi-satellite planetary reduction gear. Moreover, minimal sizes. Draw the gearbox diagram in scale .

Dynamic study of the main mechanism

Task setting:

Determine the main dimensions of the mechanism links according to the specified conditions (average piston speed, number of crankshaft revolutions at nominal engine load, ratio of connecting rod length to crank length);

Determine the required moment of inertia of fly masses providing crankshaft rotation with the specified coefficient of non-uniformity at steady mode of idling operation. Determine moment of inertia of additional fly mass (flywheel) installed on the crankshaft;

Plot the angular velocity change of the engine crankshaft during one cycle of steady state idling.