内燃機関超基礎講座 | マツダのSKYACITV-D2.2のクランクシャフト「ピン径／ジャーナル径は比率を1:1」 SH-VPTR型

2020年07月02日 07:05:00
乗り物
MotorFan

普段は見ることがないエンジンの心臓部、クランクシャフト。今回は、MAZDA6、CX-5、CX-8などが搭載する2.2ℓ直列4気筒DOHCディーゼルターボのクランクシャフトを観察してみる。

マツダSKYACTIV-D2.2（SH-VPTR型）のクランクシャフト SPECIFICATIONS

ストローク／ 94.2㎜　全長／ 485㎜　ジャーナル径／ 52㎜　ジャーナル幅／ 26㎜ピン径／ 52㎜　ピン幅／ 22㎜　ウェブ幅／ 19.5㎜　重量／ 14220ｇ

　燃費を狙い、ピン径／ジャーナル径は比率を1:1にした。ピン径よりもジャーナル径の方が抵抗に対して感度が高いため、ジャーナル径は小さくしたい。突き詰めた結果、1:1が最適値だった。細くなるジャーナル径に対してピン径が太くなると、それにともなって往復運動系が重くなり、カウンターウエイトも重くなると予想したが、それほどではなかったという。もうひとつの特徴は、そのカウンターウエイトの形状がまちまちなこと。クランクの曲げはセンター付近の方が両端より大きい。そうした状況でのメタルの油膜厚さが最適になり、かつ軽量化につながるよう設計した結果だ。また、ブロックの共振点とクランクの曲げ共振点をずらす設計を形状・剛性に折り込んでいる。

SH-VPTR 気筒配列：直列4気筒給気方式：ターボチャージャー排気量：2188cc カム配置：DOHC 内径×行程：86.0mm×94.2mm 吸気弁／排気弁数：2／2 圧縮比：14.4 バルブ駆動方式：ロッカーアーム最高出力：140kW/4500rpm 燃料噴射方式：DI 最大トルク：450Nm/2000rpm VVT／VVL：×／Ex

アクセスランキング

Tips

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