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Tomislav Skračić, MA Undergraduate English Course for MARI NE ENGINEERS 4th Semester

Tomislav Skračić, MA Undergraduate English Course for MARI NE ENGINEERS 4th Semester. Essential reading: SPINČIĆ, A., PRITCHARD, B., An English Textbook For Marine Engineers 2 ., Pomorski fakultet, Rijeka 2009.

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Tomislav Skračić, MA Undergraduate English Course for MARI NE ENGINEERS 4th Semester

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  1. Tomislav Skračić, MAUndergraduate English Course forMARINE ENGINEERS4th Semester Essential reading: SPINČIĆ, A., PRITCHARD, B., An English Textbook For Marine Engineers 2., Pomorski fakultet, Rijeka 2009. LUZER, J., SPINČIĆ, A., Gramatička vježbenica engleskog jezika za pomorce, Pomorski fakultet, Rijeka 2003.

  2. Lesson 8VALVE OPERATING GEAR

  3. Lesson 8Valve Operating Gear KEY WORDS valve operating gear - ventilno polužje za pokretanje ventila times in the cycle - momenti kružnog procesa / ciklusa push rod - spojna motka, podizač train of gears - niz zupčanika chain drive - lančani prijenos keyed on - učvršćen / osiguran klinom bolted together - spojen vijcima (danas se koriste SKF couplings - spojke na principu smicanja) follower (n.) - vodilica, podizač (usp. 'roller guide') hinged follower - zglobni podizač brijega, "britvela" sliding follower - klizni podizač

  4. Lesson 8Valve Operating Gear KEY WORDS lever form folower - podizač u obliku poluge tappet form follower - podizač u obliku cilindra side thrust - bočna sila / potisak fulcrum pin - uporište poluge pivot (n.) - os, hvatište, utorište bronze bushing - brončana rupa za osovinicu, bukola set screw - pritezni vijak, podešavajući / regulacijski vijak za zračnost i sl. lifting rod - podizna motka idle gear [aidl] - međuzupčanik

  5. Lesson 8Valve Operating Gear • DEFINITION • A mechanism for actuating & controlling the inlet and exhaust valves. It may also open and close air starting valves and fuel pumps. • 2. OPERATION OF VALVES • Mechanical (valve operating gear)

  6. Exhaust valve operating gear

  7. DEFINITION • A mechanism for actuating & controlling the inlet and exhaust valves. It may also open and close starting air valves and fuel pumps. • 2. OPERATION OF VALVES • Mechanical (valve operating gear) • Hydraulic. There are neither pushrods nor rocker arms but a piston pump. The oil pressure is led by means of a high pressure pipe to a working cylinder and hydraulic piston placed on top of the exhaust valve cage.

  8. Hydraulically operated exhaust valve (Sulzer)

  9. 3. CAMSHAFT • 3.1 CONSTRUCTION • Integral camshaft is made in a single piece of forged steel; • Separate cams of forged steel or cast iron are: • keyed on the shaft; • hyraulicaly shrunk on or press fitted; • fitted to the shaft by SKF oil injection pressure method.

  10. 3.2 CAM DESIGN

  11. 3.3 CAMSHAFT ROTATION • 4-stroke = ½ speed of the crankshaft • 2-stroke = same speed as the crankshaft • 3.4 CAMSHAFT DRIVE • Train of gears • Chain drive 3.5 REVERSING The camshaft slides axially (in 4-stroke engines) thus bringing a different set of cams for reverse direction.

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