bevel gear

...To counter this thrust, two helical gears are combined to make the tooth trace symmetrical, resulting in the double helical gear (Figure 6-e) and the double helical gear (Figure 6-f). (3) Bevel gear A gear used between intersecting shafts (usually with a shaft angle of 90°) with teeth on a conical surface. They are classified by the shape of the tooth trace: straight bevel gears, which have linear tooth traces pointing toward the apex of the cone; helical bevel gears, which have linear tooth traces that are not pointing toward the apex of the cone but are inclined; and spiral bevel gears, which have curved tooth traces (Figure 6-g)....

*Some of the terminology that mentions "bevel gear" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…この推力を打ち消すために2個のはすば歯車を組み合わせて歯筋のねじれが左右対称になるようにしたものにダブルヘリカルギヤ(図6‐e)，やまば歯車(図6‐f)がある。(3)かさ歯車bevel gear　相交わる軸(ふつうは軸角90゜)の間に使われる歯車で，円錐面上に歯をもつ。歯筋の形で分類すると，直線状の歯筋が円錐の頂点に向かっているすぐばかさ歯車，歯筋は直線であるが，円錐の頂点には向かわずに傾斜しているはすばかさ歯車および歯筋が曲線状の曲がりばかさ歯車(図6‐g。…

※「bevel gear」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報