engine assembly, the engine is also known, is capable to a form of energy that can be converted to another more useful machine, usually the chemical energy into mechanical energy (electrical energy into the energy of the machine title motor) may apply to both the power generating means may also refer to the entire machine includes a power device. Such as gasoline engines, aircraft engines.
1. The engine assembly development history
generated by the engine and review of historical development, it has gone through two stages of development and external combustion engine.
The so-called an external combustion engine, which combustion of fuel that is outside the engine, the engine such thermal energy into kinetic energy produced by the combustion, steam Watt invention is a typical external combustion engine, when a large number of coal combustion heat can heat water into steam to generate large amounts of water, high pressure will produce and promote such high-pressure and mechanical work, thus completing the transformation of kinetic energy into heat energy.
understand what is an external combustion engine, will know what is the internal combustion engine. Different maximum engine and an external combustion engine of this type is its fuel combustion therein. Very many types of internal combustion engines, our commonGasoline engine, a diesel engine is a typical internal combustion engine. Assembled on our unusual rocket engine and aircraft jet engines also belong to the internal combustion engine. However, due to the different power output, both before and after two and there is a huge difference. In general, the use of on the ground more than the former, used in the air more than the latter. Of course, some car manufacturers for the purpose of creating a new world speed record car, the car is also used coat jet engine, but it is always very special case, there is no applicability for mass production.
In addition there is the gas turbine, the working characteristics of this engine is combustion pressure gas generated by the high pressure gas turbine blades driven in rotation, to output power. Gas turbine using a wide range, but because it is difficult to finely adjust the power output, so cars and motorcycles rarely used gas turbine, gas turbine used only part of the car fitted.
Human wisdom is inexhaustible variety of new engines are constantly being developed, however, the need for safe handling, so far, our beloved motorcycle has only one choice – reciprocating engines.
2. Birth engine assembly
first engine born in England, therefore, the concept of the engine is derived from the English, its meaning is that kind of “power generation mechanism.” As technology advances, people are constantly developed different uses various types of engines, but no matter what kind of engine, its basic premise is to somehow burn fuel to generate power. Therefore, the energy source to the electrical motor, not within the scope of the engine.
3. Classification engine assembly
an automobile engine is generally obtained by the kinetic energy of gasoline internal combustion (diesel), it is an internal combustion automobile engine.
First, according to the different fuel: gasoline and diesel engines can be divided. Comparison of gasoline and diesel engine have different characteristics; gasoline high speed, low mass, low noise, easy starting, low manufacturing cost; diesel engine compression ratio, high thermal efficiency, emissions and economic performance much better than the gasoline engine.
Second, by motion of the piston: a piston reciprocating piston internal combustion engine and it can be divided into two kinds of rotary piston. The former pistons reciprocating linear motion within a cylinder, which piston in the cylinder for rotation.
Third, according to the different number of cylinders: single-cylinder engine and can be divided into multi-cylinder engine. Only one cylinder of the engine is called a single cylinder engine; two or more cylinders of the engine is called a multi-cylinder engine. Modern cars use more three-cylinder engine, four, six, eight-cylinder engine.
Fourth, the arrangement according to the different cylinders: can be divided into single-row, double row and three column. Each single cylinder engine arranged in a generally vertically arranged, in order to reduce the height of the cylinder is also sometimes arranged inclined or even horizontal. The double row cylinder engine arranged in two rows, the angle between the two lt; 180 ° (typically 90 °) referred to as V-type engine, if the engine is mounted on the angle between the two is called = 180 ° . Three column air cylinder three rows, becomes W type engine.
Fifth, according to the classification of stroke: an internal combustion engine in accordance with the number of strokes needed to complete a cycle can be divided into four strokeCombustion engines and two-stroke internal combustion engine. Automobile engines generally use four-stroke internal combustion engine. Refers to a four stroke engine is a complete working cycle, the piston reciprocates up and down within the cylinder the four strokes, the crankshaft to two revolutions (720 °); two-stroke engines is one-half the working process.
Sixth, according to whether the intake system using the boost mode: can be divided into a supercharged (intake force) and non-supercharged (naturally aspirated). Increase of the supercharger intake pressure, intake air density is increased, the internal combustion engine is supercharged, so it is easy to improve engine power. Intake air at near atmospheric conditions, a non-naturally aspirated or supercharged internal combustion engine;
VII classified by cooling: cooling an internal combustion engine according to the engine can be divided into water-cooled and air-cooled engine. Water-cooled engine with a cooling liquid is circulated in the cylinder block and cylinder head cooling jacket for cooling water as a cooling medium; and the use of air flow to the engine is the cylinder block and the cylinder head between the outer surface of the air as a cooling medium fins for cooling. A water-cooled engine cooling uniform, reliable, good cooling effect, are widely used in modern vehicle engines.