BAB III PERHITUNGAN
3.1 Data spesifikasi Yamaha Jupiter MX:
- N : daya motor = 12,5 dk
- n : putaran poros engkol= 8500 rpm
- d : diameter silinder = 5,4 cm
- V : volume langkah torak =
44 ,
134
3
cm
- a : jumlah siklus per putaran =
5 ,
2 1
- Z : jumlah silinder = 1
1. Tekanan Efektif Rata-Rata
a n
Z V
N P
l e
450000
5 ,
8500 1
44 ,
134 5
, 12
450000
2
84 ,
9 cm
kg
2. Gaya Batang Torak
s e
s
A P
F
kg 42
, 225
4 4
, 5
14 ,
3 84
, 9
2
3. Torsi Motor
n N
T
71620
8500 5
, 12
71620
cm kg.
3235 ,
105
mm kg.
235 ,
1053
3.2 Perhitungan Momen lentur dan Momen Puntir
15
225,42 kg Balancer
Magnet Spul 2 kg 2 kg
A
R
0,8 kg 0,8 kg
B
R
60mm 16mm
18mm 18mm 16mm 80mm
225,42 kg 2 kg
2 kg 0,8 kg 0,8 kg
A
R
B
R
60mm 16mm 18mm 18mm 16mm
80mm
a
M
-2 60 + 0,8 16 + 225,42 16+18 + 0,8 16+18+18 –
B
R
16+18+18+16 + 2 16+18+18+16+80 = 0
B
R
16+18+18+16 = 7894,68
B
R
= 116,18 kg
y
F
A
R
+
B
R
– 2 – 0,8 – 225,42 – 0,8 – 2 = 0
A
R
+ 116,18 – 2 – 0,8 – 225,42 – 0,8 – 2 = 0
A
R
= 114,84 kg
60
X
mm 2 kg V M
16
X
y
F
- V - 2 kg = 0 V = - 2 kg
x
M
M + 2 X = 0 M = - 2 X
X = 0 M = 0 X = 60 M = - 120 kg.mm
60 mm
76
X
mm
2 kg V M
60 mm 114,84 kg X
y
F
V – 2 + 114,84 = 0 V = 112,84 kg
Mx
M - 114,84 X-60 - 2 X = 0 M = 114,84 X-60 + 2 X
X = 60 M = - 120 kg.mm X = 76 M = 1685,44 kg.mm
17
76 mm
X 94 mm
2 kg 76 mm 0,8 kg
V M
60mm 114,84 kg X
y
F
- V – 0,8 + 114,84 – 2 = 0 V = 112,04 kg
x
M
M + 0,8 X-76 + 114,84 X-60 - 2 X = 0 M = - 0,8 X-76 – 114,84 X-60 + 2 X
X = 76 M = 1685,44 kg.mm X = 94 M = 3702,16 kg.mm
94 mm
X 112 mm
2 kg 0,8 kg 225,42 kg V M
114,84 kg 94 mm
X
y
F
-V – 225,42 – 0,8 + 114,84 – 2 = 0 V = -113,38 kg
x
M
M + 225,42 X-94 + 0,8X-76 - 114,84 X-60 + 2 X = 0
18
M = - 225,42 X-94 – 0,8X-76 + 114,84 X-60 - 2 X X = 94 M = 3702,16 kg.mm
X = 112 M = 1661,32 kg.mm
112 mm
X 128 mm
2 kg 0,8 kg 225,42 kg
0,8 kg V M
114,84 kg 112 mm
X
y
F
-V – 0,8 – 225,42 – 0,8 + 114,84 - 2 = 0 V = - 114,18 kg
x
M
M + 0,8X-112 + 225,42X-94 + 0,8X-76 - 114,84X-60 + 2X = 0
M = - 0,8X-112 – 225,42X-94 – 0,8X-76 + 114,84X-60 -2X X = 112 M = 1661,32 kg.mm
X = 128 M = - 165,56 kg.mm
128 mm
X
2 kg 0,8 kg 225,42 kg
0,8 kg V M
19
114,84 kg 116,18 kg 128 mm
X
y
F
-V + 116,18 – 0,8 – 225,42 – 0,8 + 114,84 - 2 = 0 V = 2 kg
x
M
M - 116,18X-128 + 0,8X-112 + 225,42X-94 + 0,8X-76 - 114,84X-60 + 2X = 0
M = 116,18X-128- 0,8X-112 – 225,42X-94 – 0,8X-76 + 114,84X-60 -2X
X = 128 M = - 125 kg.mm X = 0 M = 0
Diagram Momen Lentur M
3702,16 kg.mm
20
1685,44 Kg.mm
1661.32 Kg.mm
60 mm 76 mm 94 mm 112 mm 128 mm 0 -120
Kg.mm
-165,56 kg.mm
Diagram Momen PuntirTorsi T
1053,235 Kg.mm
0 60 mm 76 mm 94 mm 112 mm 128 mm 0
3.3 Dimensi poros engkol 1. Diameter Pena engkol
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