รูปทรงของหัวลูกสูบ

Posted on : 01-11-2012 | By : Author | In : การทำงานของเครื่องยนต์

รูปทรงของหัวลูกสูบอย่างง่ายที่สุดคือ หัวแบน ในอดีต เครื่องยนต์ที่มีอัตราส่วนการอัดสูงมักใช้ลูกสูบหัวโดมรูปต่าง ๆ เพื่อลดปริมาตรห้องเผาไหม้และเพิ่มอัตราส่วนการอัด ข้อจำกัดของลูกสูบหัวโดมคือ ในขณะเปิดวาล์วต้องมีเนื้อที่ว่างเพียงพอ เพื่อไม่ให้ชนกับหัวลูกสูบ ดังนั้น หัวลูกสูบจึงต้องทำร่องบากเพื่อเป็นช่องว่างสำหรับวาล์ว

หัวลูกสูบ

ในประเทศที่มีกฎหมายบังคับห้ามเติมสารตะกั่วในนํ้ามันเชื้อเพลิง ผู้ผลิตเครื่องยนต์จึงต้องลดอัตราส่วนการอัดลง โดยการทำหลุมบนหัวลูกสูบเพื่อเพิ่มปริมาตรห้องเผาไหม้ นอกจากนี้ลูกสูบบางอันมีหัวลูกสูบเป็นแบบหัวถ้วย ซึ่งช่วยเพิ่มการไหลวนของไอดีสำหรับการเผาไหม้ที่สมบูรณ์ขึ้น รูปทรงต่าง ๆ ของหัวสูบดังแสดงในรูปที่ 5.31

บทความอื่น ๆ ที่น่าสนใจ:

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