ВУЗ:
Составители:
Рубрика:
56
Module is the ratio of the pitch diameter to the number of teeth,
normally the ratio of pitch diameter in mm to the number of teeth.
Module in the inch system is the ratio of the pitch diameter in inches to
the number of teeth.
Normal plane is a plane normal to the tooth surfaces at a point of
contact and perpendicular to the pitch plane.
Number of teeth is the number of teeth contained in a gear.
Outside diameter is the diameter of the circle that contains the tops of
the teeth of external gears.
Pitch is the distance between similar, equally-spaced tooth surfaces in
a given direction along a given curve or line.
Pitch circle is the circle through the pitch point having its center at
the gear axis.
Pitch diameter is the diameter of the pitch circle. The operating pitch
diameter is the pitch diameter at which the gear operates.
Pitch plane is the plane parallel to the axial plane and tangent to the
pitch surfaces in any pair of gears. In a single gear, the pitch plane may
be any plane tangent to the pitch surfaces.
Pitch point is the intersection between the axes of the line of centers
and the line of action.
Plane of rotation is any plane perpendicular to a gear axis.
Pressure angle is the angle between a tooth profile and a radial line at
its pitch point. In involute teeth, the pressure angle is often described as
the angle between the line of action and the line tangent to the pitch
circle. Standard pressure angles are established in connection with
standard tooth proportions. A given pair of involute profiles will
transmit smooth motion at the same velocity ratio when the center
distance is changed. Changes in center distance in gear design and gear
manufacturing operations may cause changes in pitch diameter, pitch
and pressure angle in the same gears under different conditions. Unless
otherwise specified, the pressure angle is the standard pressure angle at
the standard pitch diameter. The operating pressure angle is determined
by the center distance at which a pair of gears operate. In oblique teeth
such as helical and spiral designs, the pressure angle is specified in the
transverse, normal or axial planes.
Principle reference planes are pitch plane, axial plane and transverse
plane, all intersecting at a point and mutually perpendicular.
Rack: A rack is a gear with teeth spaced along a straight line, suitable
for straight line motion. A basic rack is a rack that is adopted as the
basis of a system of interchangeable gears. Standard gear tooth
dimensions are often illustrated on an outline of a basic rack.
Страницы
- « первая
- ‹ предыдущая
- …
- 54
- 55
- 56
- 57
- 58
- …
- следующая ›
- последняя »
