Name: 迴力玩具車如何工作？（How does a Pull-Back Toy Car work?）
Uploaded: 2021-05-09T02:20:36.000Z
Duration: 5 min 3 s
Description: 迴力車機構設計相關講解影片

- [Narrator] Some toy cars have a wind up mechanism inside.

Pull it back and then release the car to watch it go.

In this video, we're gonna look at the gears,

the spring, and that clicking noise you hear

If you want one of these toy cars to move forward,

Take the case off the car and we're left with the chassis,

The motor is only connected to the back wheels.

Let's open this up to see what's going on.

The more you twist this, the tighter it gets

This spring fits quite snug inside the circular hole.

If I pull it out, then the spring immediately expands.

So be warned if you try this on your own toy car.

On the large gear, there are some curved extensions

These fit right around the center of the spring

When the car is pulled back, there's a chain reaction

and it's what causes the spring to wind up.

I have two gears here of different sizes.

If the big gear turns once, the small gear

We could repeat this again with another smaller gear here.

These always move together whether the car

Now these two gears have a mind of their own.

the wind up gear engages with the large gear.

When the car is released and starts moving forward,

so it's no longer in contact with the large gear.

The car is pulled back, the wind down gear

When the car is released, the wind down gear

slides into place just as the wind up gear

The Torsion Spring is causing the large gear to spin

This is where the gear ratios come into place.

and the back wheels of the car turn a lot.

This is part of why the car can travel so far on its own.

When the spring has released all of its energy,

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迴力玩具車如何工作？（How does a Pull-Back Toy Car work?）

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