Английский язык. Теория механизмов и машин. Профессиональная составляющая языковой подготовки. Горбенко М.В - 106 стр.

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106
In the foregoing, a cam
mechanism has been so
proportioned that the pressure
angles α
1
and α
2
at points on
the cam corresponding to
points P
1
and P
2
were
obtained. Even though P
1
and
P
2
are the points of greatest
slope on the displacement
diagram, the pressure angles
produced at some other points
on the actual cam may be
slightly greater.
However, if the pressure
angles α
1
and α
2
are not to be
exceeded at any point — i.e.,
they are to be maximum
pressure angles — then P
1
and
P
2
must be selected to be at the locations where these maximum
pressure angles occur. If these locations are not known, then the
graphical procedure described must be repeated, letting P
1
take various
positions on the curve for rise (AB) and P
2
various positions on the
return curve (CD) and then setting R
min
equal to the largest of the values
determined from the various positions.
EXERCISES TO THE CHAPTER “CAMS AND CAM DESIGN”
1. Learn these words and phrases
1. uniform motion cam - кулачок с равномерным движением
толкателя
2.
accelerated motion cam - кулачок с ускоренным движением
толкателя
3. stroke - ход, шаг
4.
cycloid motion curve cam - циклоидальный закон движения
5.
locus - местоположение
6.
cam follower system - система кулачок-толкатель
7.
radial translating roller
follower
- центральный толкатель с роликом
Fig. 12. Construction of Cam Contour; Offset
Translating Follower

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