ПЗ 39 материалы для второго курса
план-конспект урока

   Практическое занятие №39"Принцип действия двигателя внутреннего сгорания"

Стр.4 упр.2: - прочитать энциклопедическую справку , подтвердить или опровергнуть высказывания , согласно информации справки:

An internal combustion engine operates in a cycle that compresses and ignites fuel and air to generate energy. The starting point is the cylinder. The cylinder runs through the head and down into the engine block. A piston within the cylinder moves up and down At the start of the cycle, it pulls a mixture of fuel and air through valves and into the cylinder .It then moves upward compressing the fuel mixture. A piston ring forms a tight seal between the piston and the cylinder wall. This ensures that the fuel mixture cannot escape .It also keeps oil from the sump from entering the combustion chamber. Next, a spark plug fires and ignites the fuel mixture. The resulting explosion pushes the piston downward .This in turn moves a connecting rod attached to the piston. The connecting rod transfers the mechanical energy from the piston to a crankshaft contained within a crankcase.

1 -Air enters the cylinder through the valves.
2 -Fuel is compressed by the piston.
3 -The crankshaft connects to the sparkplug

Стр.4 упр.3:-соотнести определение одной из частей двигателя внутреннего сгорания и предложенных терминов:

1    -engine block          4  -piston ring
2    -connecting rod       5  -spark plug
3    -crankcase               6  -head

A   body of engine
B  holds large shaft in engine
C  creates tight seal
D  top part of engine
E  transfers power from piston
F  causes explosion

Стр.5 упр.4

Piston   cylinder    sump   crankshaft   valve

1. A ___________ controls the flow of air into engine.
2. The __________ holds the engine’s supply of oil.
3. The spark plug fires in the __________ .
4. The __________ moves up and down in a cycle.
5. The connecting rod powers the ___________ .