In the past few decades, we have witnessed the continuous advancement of internal combustion engine technology. With the addition of new technologies, the working efficiency of internal combustion engines is getting higher and higher, and the vibration and volume are getting smaller and smaller. However, in the history of the development of internal combustion engines, the smallest change is the way the piston and crankshaft move.
â–² star engine
â–² star engine map
â–²Rotor engine diagram
Among the various models of internal combustion engines, you may have heard of star engines and rotor engines, but for the following axial flow engines, you are probably the first to hear about it.
Link to axial flow engine
https://en.wiki/Axial_engine
This is a product from Duke Engines, New Zealand. They have been studying this engine for 17 years.
According to reports, based on the same displacement, the engine has a smaller mass and size, and the symmetric axial piston distribution, the vibration generated is small, and the gyro effect at high speed will be greatly reduced.
From this dissection, we can see that the axial-flow engine and the piston-cylinder movement kit are distributed around the middle transmission shaft, which is significantly different from the current V-shaped distribution of motorcycle engines.
After the gasoline is burned, the reciprocating motion of the piston is transformed through a set of rocker arm gears, which drive the five cylinders to rotate at a certain angle, and then match the common intake and exhaust and ignition systems in turn, finally achieving the center around the main output shaft. , parallel distributed mechanical structure.
â–²Please note that the swash plate is fixed on the shaft so it rotates with it
In the valve train, the axial flow engine eliminates the valve push rod, the valve and the spring, and uses a similar sliding seal inlet and exhaust structure of the rotor engine.
It is reported that Duke's axial-flow engine, 1000CC 5-cylinder model, the maximum horsepower reaches 125 horses (about 93 kW), the maximum torque is 120 Nm, and the weight is 38 kg.
For example, Ducati's latest De**osedici Stradale V4 engine has a displacement of 1103 cc, a maximum power of 156 kW, a maximum torque of 122 Nm and a weight of 65 kg.
Compared to Duke's axial-flow engines, the maximum torque is comparable and the maximum power is small, but the mass is only about half that of the De**osedici Stradale V4. From the pictures provided by the company, the prototype work is relatively rough, and if better material processing is used, the performance is expected to improve.
Duke emphasizes that their axial-flow engines are ideal for use on motorcycles and have the following advantages:
1. Small size and low weight;
2. Reversed cylinder group and crankshaft can effectively offset the gyro effect;
3, the overall shape of the engine is similar to the motor, which can provide new possibilities for motorcycle chassis integration;
4. Still using traditional gearboxes and transmission systems;
5, the number of cylinders is large, the power output is stable;
6, axial transmission, providing complete primary balance and negligible secondary vibration
7. The internal motion mechanism carries most of the reciprocating inertia load, and the cabinet can be made very light;
However, from the perspective of the piston working mode and the gas distribution mode, such an engine is likely to have the same problem of heat dissipation and fuel efficiency as the rotor engine.
Of course, as consumers, we also hope that manufacturers can come up with a product like this to meet the individual needs of everyone.
After all, in today's motorcycle market, the engine structure is already the same, and more and more consumers are willing to pay a higher price to buy products that are different and can show their individuality.
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