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23
model is diagrammed in a chosen scale with exact observance of all sizes and
forms influencing the disposition, speed and acceleration of mechanism
points.
All superfluities, not principal for movement, should be excluded in
order not to complicate the drawing (Fig. II.20).
The kinematic scheme allows investigation of all basic kinematic
parameters of the work of a mechanism. The number of drivers determinates
the number of motion freedom, or number of its degrees of freedom
concerning the rack.
We have defined that kinematic chains can incorporate a KP of 1 - 5th
classes: P
1
, P
2
, P
3
, P
4
, P
5
. Number of degrees of freedom of a separate link,
which has not been connected with others, is equal to six. If number of links
of a kinematic chain is k, then degrees of freedom of a kinematic chain is
equal to 6k. From this number, it is necessary to subtract the number of
degrees of freedom, which are subtracted by link entrance into kinematic
pairs. Therefore, the number of degrees of freedom Н of kinematic chain is:
Н = 6k – 5P
5
– 4P
4
– 3P
3
– 2P
2
– P
1
. (I.4)
Fig. II.20. Layout (а) and kinematic scheme (b) of an
internal combustion engine
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