Engine Lubrication System

Engine Lubrication System

Step I. Duty ReportStep II. Review Review what they learnt in the last classThe purpose of using a cooling systemtwo different types and their main differencesRecite the new wordsStep III. Reading materialAsk the students read the whole text and get the

main ideaDiscuss about the text

Engine Lubrication System

Step IV. Engine Lubrication SystemNew words:Check the pronunciation of the new wordsmain usage of the wordsText:We can reduce friction to a considerable degree

by the use of lubrication oil.

Engine Lubrication System

Dry friction Boundary friction Liquid friction

Types of friction

Engine Lubrication System

lubrication oil: the four main functiona protective coatingabsorb and carry the heatwash off dirtabsorb shocks

Engine Lubrication System

What’s lubrication oil made from? Two types of engine lubricating systems

splash pressure/force feed combination of the two types

main function (passage 8) main units (passage 9-17)

Engine Lubrication System

Splash lubrication（飞溅润滑）

Pressure lubrication（压力润滑）

Grease lubrication （润滑脂润滑）

Engine Lubrication System

Step V. Exercise Ask the students translate some passages Ask the students describe the main units of the

lubrication system, and their main functions