Pee Differential Speed Gear

Childhood like tossing models, played four drive, there are all kinds of gears, mainly to change the direction of gear rotation, there is a variable speed gear, the principle is simple is to change the size of the gear ratio, so that the small gears smaller, larger gears larger, thereby increasing the rotation ratio. However, the four-wheel drive has a very hidden disadvantage, that is, the four-wheel drive can not turn, unless the curve through the right and left side of the height difference to achieve the turn (train turn principle). The reason is that when the car turns, the rotation ratio of the left and right two wheels is not the same, the inner wheel speed is lower than the outside side, so as to achieve the turn, and 4x4 does not have such a function.

Today is the use of a driving technology in the car-differential gear (write this article The reason is also the night before the evening who in bed, suddenly remembered, and can't think how to achieve ... ）。 Differential gears, as the name implies, can achieve the transmission between gears with different speeds. The design is very ingenious, directly on the video ...

To sum up, the variable speed gears achieve a flexible transfer by increasing their rotation. When the gear is lowered, the low-speed gear actually becomes the rotating initiator, shifting the rotation to the gear wheel, and on the other hand increases the speed of the other gears. When a gear stop is, the speed of the gear is actually twice times the original speed, which also embodies the law of conservation of energy.

A little attention in life look at the center of the rear wheel lever of the big truck (that is, the butt, without shading), and will find that almost every truck there is a large tumor, where the variable speed gear is for the car to turn variable.

Finally left a question, I used to know from the laboratory, Daniel, all said that the triangle is stable, why the flying device is the exclusively four flywheel?
The answer is: This is the lab Daniel told me when making the aircraft, each frisbee has a certain angular momentum, if it is an odd number of flywheel, the aircraft will rotate in the air.

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Pee Differential Speed Gear