Answer
A BEVEL GEAR
斜齒輪
WINDOW QUESTION · ANSWERBUILD CLUB
The question
WHICH TYPE OF GEAR CAN TURN THE DIRECTION OF ROTATION THROUGH 90 DEGREES?
哪一種齒輪能把旋轉方向改變 90 度？
Why it works
TWO MESHING BEVEL GEARS TURN HORIZONTAL ROTATION INTO VERTICAL ROTATION
兩個互相咬合的斜齒輪，把水平轉動轉成垂直轉動
See it in action · MERRY-GO-ROUND BEVEL GEARS
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