Can anyone tell me what a rotary engine is, I don t understand.

Rotary engines rely on the expansion pressure generated by the combustion of an air-fuel mixture to obtain rotational power.

Rotary engine, which directly converts the combustion expansion force of combustible gas into driving torque.

It is by a triangle"Rotor"Rotation in an oval-like space drives the shaft in the middle to rotate, unlike the piston movement of a piston engine up and down. Since it is a direct circular motion, rather than a piston motion as in a piston engine, it is more efficient.

In fact, it is commonly known as the Wankel rotary engine.

That is, the part that provides power is rotating, that is, the part of the coil.

Rotary engines are generally used in professional racing because they operate mechanically differently than they used to, and they can bring a lot of power to the car.

The rotary engine (Wankel engine, rotary engine) was invented by the German Felix Wankel (1902-1988), who successfully developed the first rotary engine on the basis of summarizing the research results of his predecessors and solving some key technical problems. Rotary engines use a triangular rotor rotational motion to control compression and emissions, as opposed to the linear motion of a traditional reciprocating piston engine.

Comparison of rotary engines with conventional reciprocating engines: Both reciprocating engines and rotary engines rely on the expansion pressure generated by the combustion of an air-fuel mixture to obtain rotational power. The difference in the mechanism of the two engines is the way in which the expansion pressure is used.

In a reciprocating engine, the expansion pressure generated on the top surface of the piston pushes the piston downward, and the mechanical force is transmitted to the connecting rod, which drives the crankshaft to turn. Rotary engines, for rotary engines, the expansion pressure acts on the sides of the rotor. This pushes one of the three faces of the triangular rotor towards the center of the eccentric axis.

This movement is carried out under the force of the two components. One is the centripetal force pointing towards the center of the output shaft, and the other is the tangential force (ft) that makes the output shaft turn.

Rotary engine.

The triangular piston rotates in the cylinder to do work.

Hence the name rotary engine. The piston rotates three times in one week (ordinary piston engines rotate once in two weeks). The speed of work is fast, and the direction of motion is circular motion.

It moves in the same way as the engine output shaft, so the loss is low (the piston of a normal piston engine is a reciprocating motion and needs to be converted into circular motion through the crankshaft). Suitable for high-rpm cars, such as sports cars. The disadvantage is that the fuel consumption is high and the emissions are not dominant.

The structure is simple. From the principle of the rotary engine, we can see that there are only two parts of the whole object, namely the eccentric shaft and the rotor, of course, in the case of discharging the cylinder, which is extremely simple compared to other four-stroke reciprocating engines, and the space utilization is also higher. Since the rotary engine directly converts the expansion pressure generated by the combustion of the air-fuel mixture into the rotational force of the triangular rotor and the eccentric shaft, there is no need to set up a connecting rod, and the air intake and exhaust ports rely on the movement of the rotor itself to open and close; There is no longer a need for a valve mechanism, including timing belts and camshafts.

Rocker arms, valves, valve springs, etc., which are an essential part of a reciprocating engine.

As a result, a rotary engine with fewer parts has higher reliability and a higher failure rate.

It is greatly reduced, and maintenance is also convenient.

2. Smaller size.

The number of components is greatly reduced, so the overall engine is smaller and lighter. This means that the rotary engine can provide more power with the same mass and volume, which can make many engineers and tuners excited, and the free space can be filled with more opportunities for other parts, and the overall weight distribution of the body is more relaxed.

3. More power.

Unlike reciprocating engines, rotary engines only require a single shaft to achieve high speeds, with fewer accessories, less wear and tear, and mechanical efficiency.

Higher, acceleration.

Bigger, easier to achieve the desired power.

4. It has better stability and balance.

The smoothness of the single-shaft rotational motion is significantly better than that of the reciprocating piston, and there is no valve structure, so the operation process is more stable and quiet, and some data show that the quietness and smoothness of the twin-rotor engine is equivalent to that of the in-line six-cylinder reciprocating engine. Among reciprocating engines, the in-line six-cylinder is already the most stable and quiet structure, and its structure guarantees almost no excess inertial forces.

impact noise. However, the noise of the parts is unavoidable, and the rotary engine can easily achieve or even exceed the balance of the in-line six-cylinder, which is really powerful!

The triangular rotor rotary motion is used to control the compression and discharge of gas, and the combustion expansion force of combustible gas is directly converted into drive. The general engine is a reciprocating engine, the piston does reciprocating linear motion in the cylinder when working, in order to convert the linear motion of the piston into rotary motion, the crank slider mechanism must be used.

Advantage 1: High speed and high power 2: Light weight, fast throttle response 3:

The distinctive sound is charmingDisadvantages1 High fuel consumption and heavy pollution. The rotor motion of the rotary engine is characterized by the fact that while the center of the triangular rotor revolves around the center of the output shaft, the triangular rotor itself rotates around its center.

When the triangular rotor rotates, the internal ring gear centered on the center of the triangular rotor is meshed with the gear centered on the center of the output shaft, and the gear is fixed on the cylinder block without rotating, and the ratio of the number of teeth of the internal ring gear to the gear is 3:2. The above motion relationship makes the trajectory of the top angle of the triangular rotor (i.e. the shape of the cylinder wall) resemble a figure of 8.

The triangular rotor uses the top angle of the rotor to divide the cylinder into three independent spaces, and the three spaces each successively complete air intake, compression, work and exhaust, the triangular rotor rotates once, and the engine ignition does work three times. In this way, everyone understands the motion relationship of the rotor, and the speed of the output shaft is 3 times the rotation speed of the rotor, which is completely different from the motion relationship between the piston and the crankshaft of a reciprocating engine is 1:1.

Due to the lack of high compression ratios of reciprocating engines, combustion is not sufficient. Although Mazda has added things such as single-turbo and twin-turbo to the rotary engine, it only increases the output horsepower and moderately reduces exhaust emissions, but it is still far from the reciprocating engine.

2 Short component life.

Premature wear occurs due to the fact that the rotor's three top corners are responsible for sealing (there are also seals like piston rings on the top corners) and that it works for a long time without good lubrication. Although many options have been improved, such as porcelain of the cylinder wall (the surface of the cylinder wall is ceramicized to reduce friction and be more resistant to high temperatures without lubrication), the screening of the sealing material at the three top corners, and so on, there has been no better breakthrough. In addition, the problem of high temperature at the output shaft in the middle of the rotor has always troubled engineers.

1. Different properties: rotary engines rely on the expansion pressure generated by the combustion of air-fuel mixture to obtain rotational power. An engine is a machine that converts other forms of energy into mechanical energy, such as an internal combustion engine, which usually converts chemical energy into mechanical energy.

2. Different volumes: due to the great reduction of parts, the rotary engine is smaller in size and lighter in weight. Ordinary engines are heavier.

3. Different characteristics: The motion characteristics of the rotary engine are that while the center of the triangle rotor rotates around the center of the output shaft, the triangle rotor itself rotates around its center. Ordinary engines are not.

Ordinary ones are piston-type. The rotary engine, on the other hand, uses a rotor with three sides convex.

The above is very clear. That's what the Mazda RX-8 uses. However, the problem with this engine is that it is inconvenient to maintain. And maintenance is expensive. The repair parts are all imported, and only a few designated stores in the country can repair them.

Rotary engine.

It uses a triangular rotor rotational motion to control the compression and discharge of gases, directly converting the combustion expansion force of combustible gas into driving force. The triangular piston rotary engine is also known as the rotary engine.

Rotary engine principle.

In the rotary engine, the pressure generated by combustion is stored in a sealed chamber consisting of a casing and a triangular rotor.

The path of travel of the rotor is similar to that produced by a breathometer.

The apex of the rotor is in contact with the housing, resulting in the formation of three separate air chambers.

The rotor is constantly moving around the combustion chamber, and the three volumes of gas expand and contract alternately.

It is this expansion and contraction that draws air and fuel into the engine, which then compresses this gas mixture and generates useful power as the gas expands, and finally exhausts the exhaust gases.

Advantages and disadvantages of rotary engines.

Rotary engines have several advantages, the most important of which is the reduced size and weight.

The components required for the composition of the rotary engine are also very few.

But the disadvantages of the rotary engine are also obvious: 1Fuel consumption is relatively large.

2.It cannot be compression-ignited, that is, diesel cannot be used.

3.The position of the power output shaft is relatively high, which makes the layout of the whole vehicle inconvenient.

3.The processing and manufacturing technology of rotary engine is high, the cost is relatively expensive, and it is difficult to promote.

Rotary engines are also a type of internal combustion engine, but they are completely different from regular piston engines. In a piston engine, the same cylinder carries out four processes: air intake, compression, combustion, and exhaust, although the rotary engine also has these four processes, but in different ways! The basic principleLike a conventional piston engine, a rotary engine uses the pressure generated by the combustion of an oil-gas mixture to generate power.

In conventional piston engines, the pressure generated in the cylinder drives the piston to reciprocate. Piston rod belts and crankshafts convert reciprocating motion into rotation to drive the car. In a rotary engine, a triangular rotor in the middle of the cylinder block replaces a piston to transmit and seal the pressure generated after combustion.

The Mazda RX-7 is equipped with a rotary engine with three vertices that remain in contact with the cylinder body wall, creating three separate cavities. When the rotor rotates in the cylinder block, the three cavities expand and contract alternately to achieve the whole process of suction of the oil-gas mixture, compression, combustion, and then exhaust. Mazda has long used rotary engines in its products.

The RX-7, which has been on sale since 1978, is probably the most successful rotary engine powered car ever sold. The RX-7 was discontinued in the U.S. in 1995, and the rotary engine was used in new models. Mazda's new RX-8 model is equipped with a twin-rotor engine that can produce up to 250 horsepower.

The components are the same as those of the piston engine, and the rotary engine has the same ignition system and fuel supply system. Let's take a look at the internal structure of the rotary engine! The rotor rotor has three curved surfaces, each of which acts like a piston.

There is a cavity on each surface that is used to increase the displacement and mix gasoline and air to a greater extent. There is a metal strip at the junction of each two surfaces to ensure a seal between the combustion chambers, and similarly, there are metal rings on each side of the rotor to ensure a seal on the sides. In the middle of the rotor there is a pair of teeth, which are closely meshed with the gears fixed in the middle of the cylinder.

This gear determines the trajectory and direction of the rotor.

In the early market, Mazda models used rotary engines such as the Mazda RX7 and Mazda RX8. However, as of August 2019, Lulimb's models have been completely discontinued, and due to policies and other reasons, the rotary engine is no longer produced, and it has been truly withdrawn from the market.

The rotary engine eliminates the reciprocating motion effect of the piston in the cylinder of a conventional engine, and instead directly converts the combustion expansion force of the fuel and gas mixture into the driving torque, so the rotary engine is smaller in size than the conventional engine. At the same time, the rotary engine has the characteristics of low center of gravity, light weight and low failure rate, which can improve the mobility of the car to a certain extent.

But. The disadvantage of the engine is also obvious, that is, the fuel consumption is relatively high, and the emission of pollutants is more. Because the rotary motor does not have the high compression ratio of the traditional reciprocating engine, the fuel in the cylinder cannot be fully combusted, resulting in a large amount of fuel waste, and incomplete combustion produces a large number of harmful substances.

As of August 2019, production cars on the market basically use reciprocating traditional engines, and rotary engines have truly withdrawn from the automotive market. Similar to Mazda RX7, Mazda RX8 and other models equipped with rotary engines, they have also been speculated as nuclear imitations.