IV. Give a short summary of Text 4
UNIT 5
Write down the words and word combinations below into your exercise book.
1. spur gear pump шестеренный насос
2. mesh зубчатое зацепление
3. housing корпус
4. drive gear ведущее зубчатое колесо
5. drive shaft приводной вал
6. attach соединять, закреплять
7. counterclockwise против часовой стрелки
8. clockwise движущийся по часовой стрелке
9. shearpin
10. jamming of parts заклинивание, заедание.
11. herringbone gear pump ротативный насос с шевронными
шестернями
12. overlap наложение, совмещение
II. Pronounce the following words: (Прочтите следующие слова)
Spur gear pump, counterclockwise, shearpin, herringbone gear pump, clearance, drive shaft, excessive load, overlapping, pulsation
V. Read and translate Text 5 with a dictionary:
TEXT 5
SPUR GEAR PUMPS
The spur gear pump consists of two meshed gears which revolve in a housing. The drive gear in the illustration is turned by a drive shaft which is attached to the power source. The clearances between the gear teeth as they mesh and between the teeth and the pump housing are very small. The inlet port is connected to the fluid supply line, and the outlet port is connected to the pressure line, the drive gear is turning in a counterclockwise direction, and the driven (idle) gear is turning in a clockwise direction. As the teeth pass the inlet port, liquid is trapped between the teeth and the housing. This liquid is carried around the housing to the outlet port. As the teeth mesh again, the liquid between the teeth is pushed into the outlet port. This action produces a positive flow of liquid into the system. A shearpin or shear section is incorporated in the drive shaft. This is to protect the power source or reduction gears if the pump falls because of excessive load or jamming of parts.
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