35
4.2.1.1 Silinder Tekanan Rendah
D = 208 mm = 8,18 in psi
t
000 .
40 =
σ
v
t t
σ σ
=
v = faktor keamanan.Untuk beban yang dinamis diambil v = 4.
psi psi
t
000 .
10 4
000 .
40 =
=
σ
2
076 ,
703 cm
kg
t
= σ
L = 0,95.D = 0.95. 208 mm = 197,6 mm ; diambil L = 198 mm D
K .
85 ,
53 ,
___
= ;
mm K
208 .
85 ,
53 ,
___
= mm
K 8
, 176
24 ,
110
___
= Diambil : K = 150 mm
t
P D
t σ
. .
43 ,
1
= ; diambil dari [8]
mm t
54 ,
9 076
, 703
5 ,
7 .
208 .
43 ,
1
= =
,diambil = 10mm
775 ,
. 066
, D
b =
; diambil dari [7] mm
b 13
, 4
208 .
066 ,
775 ,
= =
Diambil : b = 4 mm = 0,15 in b
D t
+ +
= .
03 ,
18 ,
2
in ; diambil dari [8] 15
, 18
, 8
. 03
, 18
,
2
+ +
= t
mm in
t 15
575 ,
2
= =
36
2 ___
3
. 35
, 25
, t
t =
; diambil dari [8]
mm t
15 .
35 ,
25 ,
___ 3
= mm
t 25
, 5
75 ,
3
___ 3
=
Diambil : t
3
= 5 mm
1 ___
4
. 2
, 1
1 t
t =
; diambil dari [8] mm
t 10
. 2
, 1
1
___ 4
= mm
t 12
10
___ 4
= Diambil : t
4
= 12 mm
D t
. 25
1 ___
35 1
=
; diambil dari [10]
mm t
208 .
25 1
___ 35
1
=
mm t
32 ,
8 94
, 5
___
= Diambil : t = 6 mm
D d
i
. 25
, 20
,
___
=
; diambil dari [7]
mm d
i
208 .
25 ,
20 ,
___
= mm
d
i
52 6
, 41
___
=
Diambil : d
i
= 45 mm
i o
d d
. 7
, 1
4 ,
1
___
=
; diambil dari [7]
mm d
o
45 .
7 ,
1 4
, 1
___
= mm
d
o
5 .
76 63
___
=
Diambil : d
o
= 70 mm
37
4.2.1.2 Silinder Tekanan Tinggi
D = 163 mm = 6,41 in psi
t
000 .
40 =
σ
v
t t
σ σ
=
v = faktor keamanan.Untuk beban dinamis diambil v = 4.
psi psi
t
10000 4
000 .
40 =
=
σ
2
076 ,
703 cm
kg
t
= σ
L = 0,95D = 0.95. 163 mm = 154,8 mm ; diambil L = 155 mm D
K .
85 ,
53 ,
___
= ; diambil dari [7]
mm K
163 .
85 ,
53 ,
___
= mm
K 55
, 138
39 ,
86
___
= Diambil : K = 112 mm
t
P D
t σ
. .
43 ,
1
=
mm t
23 ,
7 076
, 703
5 ,
7 .
163 .
43 ,
1
= =
Diambil : t
1
= 7 mm
775 ,
. 066
, D
b =
mm b
41 ,
3 163
. 066
,
775 ,
= =
Diambil : b = 3 mm = 0,12 in b
D t
+ +
= .
03 ,
18 ,
2
in 12
, 41
, 6
. 03
, 18
,
2
+ +
= t
mm in
t 49
, 12
492 ,
2
= =
38 Diambil : t
2
= 12 mm
2 ___
3
. 35
, 25
, t
t =
mm t
12 .
35 ,
25 ,
___ 3
= mm
t 2
, 4
3
___ 3
=
Diambil : t
3
= 4 mm
1 ___
4
. 2
, 1
1 t
t =
mm t
7 .
2 ,
1 1
___ 4
= mm
t 4
, 8
7
___ 4
= Diambil : t
4
= 8 mm
D t
. 25
1 ___
35 1
=
mm t
163 .
25 1
___ 35
1
=
mm t
52 ,
6 657
, 4
___
= Diambil : t = 6 mm
D d
i
. 25
, 20
,
___
= mm
d
i
163 .
25 ,
20 ,
___
= mm
d
i
75 ,
40 6
, 32
___
=
Diambil : d
i
= 35 mm
i o
d d
. 7
, 1
4 ,
1
___
= mm
d
o
35 .
7 ,
1 4
, 1
___
= mm
d
o
5 ,
59 49
___
=
Diambil : d
o
= 55 mm
39
D L0
L1 dpi
dpo
4.2.2 Pena Torak Piston
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