ซีลนํ้ามันหล่อลื่นก้านวาล์ว

Posted on : 02-11-2012 | By : Author | In : การทำงานของเครื่องยนต์

ส่วนบนของฝาสูบต้องการนํ้ามันหล่อลื่นอย่างมากเพื่อหล่อเลี้ยงส่วนต่าง ๆ เช่น ก้านวาล์ว กระเดื่องวาล์ว ก้านกระทุ้ง (ถ้าใช้) และเพลาลูกเบี้ยว (ถ้าติดตั้งในฝาสูบ)

เพื่อป้องกันไม่ให้นํ้ามันหล่อลื่นไหลผ่านก้านวาล์วเข้าสู่ห้องเผาไหม้ จึงต้องมีเครื่องป้องกัน ซึ่งอาจเป็นปลอกกันนํ้ามัน หรือซีลน้ำมัน หรือทั้ง 2 อย่าง นํ้ามันหล่อลื่นปริมาณเหมาะสมเพียงเล็กน้อยที่สามารถไหลผ่านซีลนํ้ามันเข้าไปหล่อลื่นก้านวาล์วได้ ปลอกกันน้ำมันหรือซีลนํ้ามัน แสดงดังรูปที่ 6.23 และรูปที่ 6.24

ถ้านํ้ามันหล่อลื่นไหลผ่านก้านวาล์วเข้าสู่ห้องเผาไหม้มาก จะเกิดกากคาร์บอนสะสมในกระบอกสูบ วาล์วและแหวนลูกสูบอาจอุดตัน และติดตายได้ และอาจทำให้หัวเทียนบอด

บทความอื่น ๆ ที่น่าสนใจ:

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