A flat plate or rod with teeth of the same shape and evenly spaced on one side. It can be considered as a spur gear with an infinite pitch circle diameter, and in an involute gear, the teeth of the rack are straight. Racks are used to mesh with the small gear (also called a pinion, the gear with the fewer teeth in a pair of gears) and are also used in steering parts of automobiles. Racks are also used as cutters for cutting gear teeth (rack cutters). The JIS specifies that racks with the specifications specified for standard gears are called basic racks. A specific pitch line where the thickness of the rack teeth is half the pitch is called the basic pitch line, and a tool with the cutting edge in the space of the basic rack is called a basic rack-type tool. rack |
平らな板または棒の一面に,等間隔に同形の歯を刻んだもの。平歯車のピッチ円直径が無限大になったものと考えてよく,インボリュート歯形ではラックの歯形が直線になる。ラックは小歯車 (ピニオンともいう。1対の歯車で歯数の少いほうの歯車) と噛み合せて用いられ,自動車のステアリング部品にも組込まれている。また,ラックは歯車の歯切り用のカッタ (ラックカッタ) としても利用される。 JISでは,標準歯車に定められた諸元を有するラックを基準ラックとして規定している。ラックの歯の厚さがピッチの2分の1になるような特定のピッチ線を基準ピッチ線といい,基準ラックの空間部分を切刃部とした工具を基準ラック形工具と呼ぶ。
ラック
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