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47
c). spiral bevel
3. The addendum is the radial distance between the……
a). bottom land and pitch circle
b). top land and the pitch circle
c). flanks of adjacent teeth
4. …….. is one of the simplest gears
a). Helical
b). Spur
c). Worm
11. Translate the following sentences paying attention to the Participle II of
the verbs.
1. Helical gears can be used for the same application.
2 .Bevel gears have teeth formed on the conical surfaces.
3. The standards were originally planned to attain interchangeability of
gears.
4. The inclined tooth also develops thrust loads.
5. The forces and moments are transmitted to meshing gears.
6. The circular pitch is the distance, measured on the pitch circle.
12. Work in pairs. Make up a dialogue about different types of gears.
IV. GEARS AND GEARING
(PART I)
1. Types of gears
External spur gears are cylindrical gears with straight teeth cut parallel to
the axes. Gears transmit drive between parallel shafts. Tooth loads produce
no axial thrust. Excellent at moderate speeds but tend to be noisy at high
speeds. Shafts rotate in opposite directions.
Internal spur gears provide compact drive arrangements for transmitting
motion between parallel shafts rotating in the same direction.
Helical gears are cylindrical gears with teeth cut at an angle to the axes.
Provide drive between shafts rotating in opposite directions, with superior
load carrying capacity and quietness than spur gears. Tooth loads produce
axial thrust.
Crossed helical gears are helical gears that mesh together on non-parallel
axes.
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