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95
6. To derive an expression for
the efficiency of the planetary
train…
7. Ring gear is…
first suggested by Massot.
f.
always larger than sun gear.
g.
affected by the relative motion of the
planet cage.
9. Tick the statements which are true:
1. Power losses become a function of the power transmitted in the gearing.
2. Tooth mesh losses in external gears are less than in internal gears.
3. One of the main sources of power losses is oil-churning
4. Ring gear is always smaller than sun gear.
5. Pitch-line velocity has great influence on gear efficiency.
6. A mean coefficient of friction is equal to 0, 09.
10. Translate the following verb forms.
Methods have been proposed; gear arrangements are analyzed; general
concepts should be rewired; expressions have been developed; to be best
suited; conclusions can be made; must be taken into account; analyses are
based; symbols are defined; gear pairs will be considered.
11. Read the paragraph “Planetary gear drives” again and tell it in English
using the following words and word combination:
Planetary gear drive; significant effect; efficiency; power losses; power
developed; principle of equilibrium; equivalent conventional gear;
kinematic characteristics; sliding friction; geometry of tooth profiles;
comparative evaluation; pitch-line velocity; coefficient of friction.
12. Discuss the theme “Simple planetary system” using the following as
phrase-openings.
1. The problem is
2. I want to tell about
3. The main idea of the chapter is
4. As far as I know
5. The key problem of the article
6. Next I have to point out
7. I want to note
8. We have to keep in the mind
9. At last it’s necessary to
13. Suggest your own headings for the paragraphs “Simple planetary
system” and “Compound systems”. Compare ideas with your partner.
14. Make up your own presentation about compound systems.
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