BAB I sabuk
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Transcript of BAB I sabuk
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Imam Maolana
Jurusan Teknik Mesin
Politeknik Indramayu
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Elemen Mesin II
� Transmisi sabuk
� Roda gigi
� Rantai
Penilaian:
� Tugas & PR = 15 %
� Quiz = 15 %� Rantai
� Kopling & Rem
� Sambungan
� Quiz = 15 %
� UTS = 25 %
� UAS = 30 %
� Projek = 15 %
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Transmisi daya dari poros
�Sabuk
�Roda gigi Poros tidak segarisRoda gigi
�Rantai
�Flens
Poros tidak segaris
Poros segaris
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Kapan digunakan?
Roda gigi Jarak antar poros dekat
Jarak antar poros relatif jauhSabuk Jarak antar poros relatif jauh
• Jarak antar poros dekat & jauh• diinginkan umur yang lebih awet• temperatur tinggi
Sabuk
Rantai
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Sabuk digunakan untuk mentransmisi
daya dari satu poros ke poros lainnya
melalui puli yang berputar pada
kecepatan yang sama atau tidak sama
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Jenis Sabuk
Sabuk rata Sabuk V Sabuk bulat
(d) Timing belt (sabuk gilir)
Daya besar &jarak relatif dekat
Daya menengah &jarak <= 8 m
Daya besar &jarak > 8 m
Daya besar , tanpa slip, perbandingan putaran eksak
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Pemasangan Sabuk
Tipe terbuka
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Tipe menyilang
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Tipe kuarter
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Pemasangan dengan idler pulley
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Sabuk berganda
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Sabuk bertingkat
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Sabuk dengan puli bebas dan tetap
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Perbandingan putaran
d1 d2
n1 n2
2
1
1
2
d
d
n
n=
d1 d2
d1 = diameter puli penggerak (m)d2 = diameter puli yang digerakan (m)n1 = putaran puli penggerak (rpm)n2 = putaran puli yang digerakan (rpm)
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Tipe terbuka
Panjang sabuk (L)
( ) ( )C
ddCddL
42
2
2
2121
−+++=
π
Tipe menyilangTipe menyilang
( ) ( )C
ddCddL
42
2
2
2121
++++=
π
L = (m)d1 =diameter puli penggerak (m)d2 =diameter puli yang digerakan (m)C = jarak antar pusat puli (m)
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Rasio gaya tegang sabuk rata
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Rasio gaya tegang sabuk rata
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θµ⋅= eT
T
2
1
T1 = Gaya tegang pada sisi kencang (N)T2 = Gaya tegang pada sisi kendor (N)μ = koefisien gesek antara sabuk dan puliθ = sudut kontak (rad)
α = lihat gambar sebelumnya
rad180
1π
=°
Rasio gaya tegang sabuk rata
Untuk pemasangan tipe terbuka
rad180
)2180(π
αθ −=
Untuk pemasangan tipe menyilang
rad180
)2180(π
αθ +=
Keterangan (berlaku bagi sabuk rata dan sabuk V):• Jika kedua puli menggunakan material yang sama, sudut
kontak diambil dari puli kecil• Jika kedua puli menggunakan material berbeda, sudut
kontak diambil dari puli yang μθ kecil
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Rasio gaya tegang sabuk V & bulat
β
µθ
sinlog3,2
2
1 =
T
TT1 = Gaya tegang pada sisi kencang (N)T2 = Gaya tegang pada sisi kendor (N)μ = koefisien gesek antara sabuk dan puliθ = sudut kontak (rad)
2β = sudut alur puli (derajat)
rad180
1π
=°
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Daya ditransmisikan (P)
vTTP ⋅−= )( 21
2211 ndndv
⋅⋅=
⋅⋅=
ππ
P = (watt)T1 = gaya tegang sisi kencang sabuk (N)T2 = gaya tegang sisi kendor sabuk (N)v = kecepatan linear sabuk (m/s)d1 = diameter puli penggerak (m)d2 = diameter puli yang digerakan (m)n1 = putaran puli penggerak (rpm)n2 = putaran puli yang digerakkan (rpm)
6060
2211 ndndv
⋅⋅=
⋅⋅=
ππ
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Torsi ditransmisikan
221
121
)(PGTorsi
)(PPTorsi
rTT
rTT
⋅−=
⋅−=
221 )(PGTorsi rTT ⋅−=
Torsi PP = torsi puli penggerak (Nm)Torsi PG = torsi puli digerakan (Nm)T1 = gaya tegang sisi kencang sabuk (N)T2 = gaya tegang sisi kendor sabuk (N)r1 = radius puli penggerak (m)r2 = radius puli yang digerakan (m)
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Gaya Tegang Sentrifugal (Tc)2
mvTC =
TC = (N)m = massa sabuk per satuan panjang (kg/m)v = kecepatan linear (m/s)
)( kencangsisiTTT +=
Gaya Tegang Total
)(
)(
22
11
kendorsisiTTT
kencangsisiTTT
Ctotal
Ctotal
+=
+=
Gaya Tegang Total Diizinkan (Tizin)
AT
ATTT
izintotal
izinizinizintotal
⋅≤
⋅=→≤
σ
σ
1
1
Tizin = (N)Ttotal 1 = (N) σizin = tegangan maks diizinkan (Pa) tergantung material sabukA = luas penampang sabuk (m2)