When it comes to the Mazda RX8, the first thing that comes to mind is its unique dual-rotor engine. People will be amazed at its speed of nearly 9000 rpm and 231 powerful power, because it only has a displacement of 1.3 liters. The structure is very simple. In general, the cylinder body and the rotor and the output shaft constitute a bulky crank mechanism of the piston engine, which is a complex gas distribution mechanism. The structure can be said to be many times simpler. The moving parts also have only the rotor and the output shaft, no valves, no camshafts, and no timing chain. Although the compact rotor engine is powerful, the biggest disadvantage of the rotary engine is high fuel consumption, durability and low. For example, the old Mazda RX8 cylinder has a volume of only 2.6L, but the fuel consumption is very high, comparable to the 4.0L engine. The durability is poor, the basic needs of the engine that ran less than 200,000 kilometers are overhauled, the maintenance is very troublesome, and the problem of running to the engine requires the Japanese locals to send specialized technicians, so this is a rotating engine that pushes them to come In the entire insurmountable gap. Therefore, the Mazda rotary engine was eventually abandoned. advantage 1: high speed and high power 2: Light weight, fast throttle response Disadvantage 1: The torque is small, and the acceleration is weak. 2: Maintenance is difficult because the technology is completely unpopular. 3: Mechanical efficiency is less than 20% The conventional piston reciprocating engine converts the linear motion of the piston into a rotary motion by a connecting rod and a crankshaft. The piston is propelled by the high-pressure gas generated by the combustion of gasoline, so the output from combustion to the rotational torque requires a very complicated crank-link mechanism conversion. What about a rotary engine? Nothing is there. It directly drives the rotor to rotate with the high pressure gas generated by the burning. It also has four strokes. Like the piston reciprocating engine, it also divides the intake, compression, work and exhaust, but it does not rely on the opening and closing of the valve to control the ventilation, but through the rotor itself. The scavenging gas is ventilated (pictured): As shown above, the rotor rotates clockwise. Before the scavenging air sweeps over the air inlet, the volume of the cylinder will increase with the movement of the rotor. At this time, the negative pressure air intake is generated, when the scavenging air sweep After passing through the air inlet, the intake air stops; as the rotor continues to move, the volume inside the cylinder will become smaller and smaller. At this time, the compression stroke is performed; when the cylinder volume is small enough to approach the critical value, the spark plug is ignited and ignited. The gas is mixed in the cylinder, the gas rapidly expands, and the rotor continues to rotate clockwise, and then the cylinder volume becomes larger. When the scavenging strip moves to the exhaust port, the work is completed; after the scavenging air sweeps through the exhaust port, the exhaust port It communicates with the cylinder, at which point the exhaust stroke begins, the rotor still moves clockwise, the cylinder volume becomes smaller, the exhaust gas in the cylinder is exhausted, and the cycle is continued. The rotary engine directly converts the heat generated by combustion into rotational energy. Therefore, the moving parts of the engine are very simple, so the mass is small, the rotational inertia is also small, and the rotational speed is naturally easy to increase. This high speed of 9000 rpm is not surprising. So how does the displacement of 1.3L produce 231 horsepower? In fact, it is not the high efficiency of the conversion of the rotor engine cylinder to thermal energy, but the opportunity for him to do work in one stroke time is more than the ordinary piston engine. As can be seen from the above figure, the rotor has three faces that work simultaneously when the rotor is rotating. In order to understand the four strokes of the rotor engine, I only listed the working process of one rotor face in the above figure, but in fact, there are two faces that are also started at the same time: This means that the engine has to do three revolutions per revolution of the output shaft. The crankshaft of a four-stroke engine does not do the same work every two revolutions of the crankshaft, so the power output naturally increases exponentially with the same displacement. The so-called double rotor is to connect two rotor engines in series, which is equivalent to the multi-cylinder engine connecting several cylinders in series, which can improve the output power and balance the vibration generated during the rotation. So the actual working condition of a 1.3-liter two-rotor engine is equivalent to the working capacity of a 7.8-liter V12 engine. It is not surprising that it can output 231 horsepower. Similarly, the amazing fuel consumption of 14L/100KM is not surprising. Therefore, it is not difficult to see that the rotary engine does not improve the efficiency of converting thermal energy into mechanical energy, but is equivalent to simplifying the V6 engine. Since simplification, of course, there are simplification benefits. First, the rotor engine is much lighter than the ordinary piston engine, so the motion inertia is much smaller, which is beneficial to increase the speed, and the throttle response is particularly fast; the volume is also smaller than the ordinary piston engine. A lot, more conducive to the arrangement, can make the weight distribution of the front and rear axles 50:50 easier. It also benefits the shape of the front end of the car, allowing the hood to be designed to lower the driver's view and expand the interior. High speed, can make the driver's heart boiling, but also make the whole car in the middle and rear part of the momentum! The weight reduction and the uniform distribution of the front and rear center of gravity give the vehicle better power and handling, making the steering more acute and precise. Since the engine eliminates the complicated valve train, there is no irritating metal knocking sound even when running at high speeds, accompanied by friction between the scavenging strip and the cylinder wall at high speeds. Sound, so it has a distinctive sound, and it can make people more excited when they control it at high speed! Communication Zinc Alloy Die Casting Communication Zinc Alloy Die Casting,Aluminium Casting Mold,Aluminum Alloy Die Casts,Motor Housing Part Pressure Metal Dongguan Metalwork Technology Co., LTD. , https://www.dgdiecastpro.com
