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54
4. have teeth ………….
5. the diameter of………
6. straight teeth……….
7. shafts rotate ………..
8. the angle between …..
9. to drive………..
6. Answer the following questions.
1. What is the difference between external spur gear and internal spur
gear?
2. What is the crossed helical gear?
3. What kind of teeth do spiral bevel gears have?
4. What do we call zerol bevel gears?
5. What is the difference between arc of action and arc of recession?
6. What is the axial plane?
7. Is central plane perpendicular to the gear axis?
8. What is the difference between the contact –ratio face and contact ratio-
total?
7. Agree or disagree to these statements.
1. Axial thickness is the distance perpendicular to the axis.
2. Bottom land is the surface of the gear between the flanks of the tooth.
3. Internal spur gears transmit motion between nonparallel shafts.
4. Crossed helical gears mesh together on non-parallel axes.
5. Dedendum is the radial distance between the pitch circle and bottom
land.
6. External spur gears are noisy at high speed.
7. Central plane is the plane parallel to the gear axis in a worm gear.
9. Fill in the gaps inserting the verbs in brackets in the correct form.
1. Chordal thickness is the length of the chord (subtend) by the circular
thickness arc.
2. Gears (transmit) drive between parallel shafts.
3. The spiral angle (not, effect) the smoothness of operation.
4. Worm gears (use) to transmit motion between shafts at right angles.
5. Spiral bevel gears (have) oblique teeth.
6. The distance between the axes (call) the offset.
7. The axes of hypoid bevel gears (to be) non-intersecting and non-parallel.
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