186
for the spatial mechanism:
(2.12)
for flat mechanism:
(2.13)
In both formulas, the number of mobile links is determined by the method
of selecting kinematic pairs and excess circuit links, achieving an integer num-
ber of links.
We synthesize the structural scheme of a flat cam mechanism of the mecha-
tronic module with translational displacement of the output link (pusher) and
with one degree of mobility containing kinematic pairs of the second and fifth
classes and having one superfluous link.
We calculate the number of moving links and kinematic pairs of mechanism
by the formula (2.12):
where 1 is the number of excess links.
Kinematic pairs are chosen so that an integer n of mobile links is obtained.
Number of closed circuits:
К = 4 – 3 = 1.
Thus, the mechanism contains three moving links,
one pair of the second
class, three pairs of fifth class and one superfluous link-roller 1. The scheme
of the synthesized cam mechanism of the mechatronic
module is shown in
Figure 2.3.
Figure 2.3 – Diagram of the synthesized cam mechanism of the mechatronic module
187
Synthesize the structural scheme of the serrated planetary mechanism of
mechatronic module with one degree of mobility and containing pairs of the
second class and rotational couples of the fifth class.
Determine the number of moving links and kinematic pairs of mechanism:
where 2 is the number of excess circuits links of the mechanism that we select
so that an integer number of moving links is obtained.
Thus, the mechanism consists of three moving links, two pairs of the second
class and three pairs of the fifth class.
We find the number of closed circuits of the mechanism:
К = 5 – 3 = 2.
We build a structural scheme of the planetary mechanism, consisting of two
movable cogwheels 1 and 2, a fixed cogwheel 3 and carrier H (Figure 2.4).
Figure 2.4 – Block diagram of the planetary mechanism
We calculate the number of redundant connections of each circuit:
for the first A
5
B
2
C
5
D
5
S
1
= 3 – (4 –
2)1 = 1;
for the second A
5
E
2
C
5
D
5
S
2
= 3 – (4 –
2)1 = 1.
Достарыңызбен бөлісу: