Name: ロータリーエンジンの仕組み (Rotary Engine | How It Works)
Uploaded: 2021-01-14T11:23:07.000Z
Duration: 10 min 2 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

and I don't know if I'll ever get tired of it.

What if I told you we could skip all of that crap?

Not worry about turning downward force into rotational force

and cut the size of the gall dang engine in half?

In 1951, Felix Wankel got this idea in his head

that if you put a triangular rotor in a well-designed

circely, oval-ish shape, you could make an engine

that took care of intake, compression, combustion,

and exhaust, just like the traditional piston-drive

And because it's a spinning motion, you wouldn't need

to worry about crankshafts and valves and timing belts

and lifters and all that crap that other people

He had some trouble getting it right, though.

So it was in 1961 that Mazda, intrigued by this idea,

It's what'll drive the driveshaft, which is also weird.

Instead of a piston, this magic triangle is called a rotor,

The rotor sits inside of a housing and rotates

around a fixed gear attached to the housing.

This gear makes sure that the rotor follows the right path,

so it's not just floating around in there.

The rotor then spins an eccentric output shaft,

You can call it a driveshaft if you want,

But just the names of the parts should let you know

that the Wankel rotary engine plays by its own rules.

Now that we know the parts, let's see how they fit together

As the triangle-shaped rotor draws away from the wall

As it passes the intake hole, it continues to pull away

from the wall, drawing the air-fuel mixture

into the chamber it's creating, just like a piston

When the peak of the rotor passes the intake port,

The rotation of the triangle, still sealed against

the housing, begins to compress the air-fuel mixture

When the air is as compressed as it can be and the rotor

has just a bit more mass on the other side of the chamber,

If there's only one plug, the flame would spread too slowly

When the sparkplugs ignite the air-fuel mixture, kapow!

It forces the rotor to move in a direction

that allows the combustion reaction to expand,

continuing the rotor's journey around the housing.

The combustion gasses continue to expand, moving the rotors

and creating power, until the peak of the rotor

Just like the rotor compressed the air-fuel mixture

against the wall with the sparkplugs, on this side

of the housing, the rotor pushes the exhaust gasses

And if you look at the other point of the triangle,

the rotor is beginning to draw air into the intake chamber

just as it's finishing with the exhaust down here!

So the cycle continues, over and over and over

and over and over and over, and it continues to go

But unlike the jerky up-and-down motion of the pistons,

the rotor moves, just like my favorite band,

There's so much rubbing going on between the rotor

and the housing that that gave Wankel a lot of problems

Engineers realized that a hole to let in the engine oil

would reduce wear on the rotor and housing.

Also, to make sure that no chamber of the combustion cycle

loses pressure, apex seals cap the point of the triangle.

These tweaks are what took Wankel's early underwhelming

experiments from curiosity to practicality.

With three sides, as soon as one side begins,

let's say, combustion, another side is completing

exhaust while the third side is drawing in air and gas!

So, unlike a traditional piston-driven engine,

which would need three cylinders to do that,

like the rare but very real in-line three, you only need

one active component, the rotor, to have three stages

of engine combustion occurring simultaniously.

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ロータリーエンジンの仕組み (Rotary Engine | How It Works)

engage

force

brilliant

crap