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62
4. Plane of rotation is not perpendicular to a gear axis.
5. The surface between the pitch line elements and the tooth tip is called
tooth surface.
6. True involute form diameter is the largest diameter on the tooth.
7. Complete the sentences using the words below:
Words: coincides, teeth, tensile, torque, point, plane, tip, inner
1. Number of teeth is the number of …….. contained in a gear.
2. Internal gear is a gear with teeth on the …….. cylindrical surface.
3. Fillet stress is the maximum …….. stress in the gear tooth fillet.
4. Tangent plane is the plane tangent to the tooth surfaces at a …… or line
of contact.
5. Plane of rotation is any …….. perpendicular to a gear axis.
6. Tooth face is the surface between the pitch line element and the tooth
…….. .
7. Efficiency is the ……… ratio of a gear set divided by its gear ratio.
8. Internal diameter is the diameter of a circle that ….. with the tops of the
teeth of an internal gear.
8. Make up a story “My first acquaintance with gears”. Express your
impression.
9. Classify gears and their elements given on pictures.
10. Classify gears and their elements given on cards. Name all required
elements.
11. Solve problems. Use formulas that you know and given in tables IV.3
and IV.4.
PROBLEMS
ANALYSIS
1.1
A 17-tooth spur pinion has a diametral pitch of 8,
runs at 1120 r/min, and drives a gear at a speed of
544 r/min. Find the number of teeth on the gear and
the theoretical center-to-center distance.
ANALYSIS
1.2
A 15-tooth spur pinion has a module of 3 mm and
runs at a speed of 1600 r/min. The driven gear has 60
teeth. Find the speed of the driven gear, the circular
pitch, and the theoretical center-to-center distance.
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