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V - BELT
Oleh :
Kusuma Darmono
Oktavianus Yudi F.W.
Johanes Budi P.
Ardian Krisnu Murti
Aditya Pitra P.
Arief Selamat R.
Made Arya Dharmawan
Achmad Fauzi
Stephanus Danny K.
Abiniswu

26358
26187
26862
26721
26482
26480
26613
26254
26382
26469
V-Belt :
Belt yang berpenampang trapesium, terbuat
dari tenunan dan serat-serat yang dibenamkan
pada karet kemudian dibungkus dengan
anyaman dan karet; digunakan untuk
mentransmisikan daya dari poros yang satu ke
poros yang lainnya melalui pulley yang berputar
dengan kecepatan sama atau berbeda.
BAHAN V - BELT
• Kulit
• Ayaman benang
• Karet
BAGIAN - BAGIAN V – BELT :
JENIS-JENIS V-BELT
 Tipe standar; ditandai huruf A, B, C, D, & E
 Tipe sempit; ditandai simbol 3V, 5V, & 8V
 Tipe untuk beban ringan; ditandai dengan

3L, 4L, & 5L
V-Belt tipe standar
Ukuran V-Belt tipe sempit
KELEBIHAN V-BELT
 V-belt lebih kompak
 Slip kecil dibanding flat belt
 Operasi lebih tenang
 Mampu meredam

kejutan saat start
 Putaran poros dapat dalam 2 arah &
posisi kedua poros dapat sembarang
KELEMAHAN V-BELT
 Tidak dapat digunakan untuk jarak poros

yang panjang
 Umur lebih pendek
 Konstruksi pulley lebih kompleks
dibanding pulley untuk flat belt
LANGKAH PEMILIHAN V-BELT


Menghitung efisiensi transmisi V-belt 90-98%
daya nominal x faktor pemakaian
daya desain =
faktor koreksi panjang x faktor koreksi sudut kontak




Menghitung daya nominal dan putaran
Memilih puli penggerak dan yang digerakkan
berdasarkan perbandingan kecepatan &
diameter minimum.


Menghitung jarak antara sumbu poros (C)

C = 3R 1 + R 2 atau C = 2R 2
R 1 = jari − jari pulley kecil
R 2 = jari − jari pulley besar


Menghitung torsi pada pulley kecil berdasarkan daya
desain & putaran.
Kemudian dihitung tarikan pada belt yang tegang
berdasarkan persamaan :

F1
µθ1 cos ecα
=e
F2
 Tarikan belt maks ≤ Tarikan maks

yang diijinkan belt
 Jika tidak terpenuhi, maka:


Pilih penampang belt yang lebih besar

Gunakan lebih dari satu belt
V – BELT Variable Speed Drives :
Posisi V-Belt dapat berubah di dalam groove
jika jarak shaft driven dan driving bergeser
 Pulley dapat meregang dan merapat
 Kecepatan belt direncanakan antara 10 – 20
m/s, maks 25 m/s.
 Daya Maks yang dapat ditransmisikan + 500 KW
 Driven pulley dapat berupa flat atau faced pulley
 V-Belt tidak dapat digunakan pada center
distance yang terlalu besar



V-belt biasa digunakan untuk menurunkan putaran, perbandingan
reduksi i (i > 1)

Dp 1
n1
=i=
=
n2
dp u

n1 = putaran puli penggerak
n2 = putaran puli yg digerakkan
dp = diameter puli penggerak
Dp = diameter puli yg digerakkan

1
u=
i


Kecepatan Linear V-Belt :

v=

d p n1
60 ×1000

(rpm)
(rpm)
(mm)
(mm)
Aplikasi V-Belt
 Penerus daya pada mesin-mesin

kecepatan tinggi, seperti kompresor, dll.
 Kipas radiator mobil
 Mesin-mesin pertanian
 Mesin-mesin industri
 Mesin perkakas
 Mesin kertas, mesin tekstil, dsb.
CONTOH-CONTOH V-BELT

wedge v-belt
wrapped type

classical v-belt raw edge
cogged type

classical v-belt
wrapped type

classical double v-belt

wedge v-belt raw
edge cogged type

variable speed v-belt

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V belt

  • 1. V - BELT Oleh : Kusuma Darmono Oktavianus Yudi F.W. Johanes Budi P. Ardian Krisnu Murti Aditya Pitra P. Arief Selamat R. Made Arya Dharmawan Achmad Fauzi Stephanus Danny K. Abiniswu 26358 26187 26862 26721 26482 26480 26613 26254 26382 26469
  • 2. V-Belt : Belt yang berpenampang trapesium, terbuat dari tenunan dan serat-serat yang dibenamkan pada karet kemudian dibungkus dengan anyaman dan karet; digunakan untuk mentransmisikan daya dari poros yang satu ke poros yang lainnya melalui pulley yang berputar dengan kecepatan sama atau berbeda.
  • 3. BAHAN V - BELT • Kulit • Ayaman benang • Karet BAGIAN - BAGIAN V – BELT :
  • 4. JENIS-JENIS V-BELT  Tipe standar; ditandai huruf A, B, C, D, & E  Tipe sempit; ditandai simbol 3V, 5V, & 8V  Tipe untuk beban ringan; ditandai dengan 3L, 4L, & 5L
  • 7. KELEBIHAN V-BELT  V-belt lebih kompak  Slip kecil dibanding flat belt  Operasi lebih tenang  Mampu meredam kejutan saat start  Putaran poros dapat dalam 2 arah & posisi kedua poros dapat sembarang
  • 8. KELEMAHAN V-BELT  Tidak dapat digunakan untuk jarak poros yang panjang  Umur lebih pendek  Konstruksi pulley lebih kompleks dibanding pulley untuk flat belt
  • 9. LANGKAH PEMILIHAN V-BELT  Menghitung efisiensi transmisi V-belt 90-98% daya nominal x faktor pemakaian daya desain = faktor koreksi panjang x faktor koreksi sudut kontak   Menghitung daya nominal dan putaran Memilih puli penggerak dan yang digerakkan berdasarkan perbandingan kecepatan & diameter minimum.
  • 10.  Menghitung jarak antara sumbu poros (C) C = 3R 1 + R 2 atau C = 2R 2 R 1 = jari − jari pulley kecil R 2 = jari − jari pulley besar  Menghitung torsi pada pulley kecil berdasarkan daya desain & putaran. Kemudian dihitung tarikan pada belt yang tegang berdasarkan persamaan : F1 µθ1 cos ecα =e F2
  • 11.  Tarikan belt maks ≤ Tarikan maks yang diijinkan belt  Jika tidak terpenuhi, maka:  Pilih penampang belt yang lebih besar  Gunakan lebih dari satu belt
  • 12. V – BELT Variable Speed Drives : Posisi V-Belt dapat berubah di dalam groove jika jarak shaft driven dan driving bergeser  Pulley dapat meregang dan merapat  Kecepatan belt direncanakan antara 10 – 20 m/s, maks 25 m/s.  Daya Maks yang dapat ditransmisikan + 500 KW  Driven pulley dapat berupa flat atau faced pulley  V-Belt tidak dapat digunakan pada center distance yang terlalu besar 
  • 13.  V-belt biasa digunakan untuk menurunkan putaran, perbandingan reduksi i (i > 1) Dp 1 n1 =i= = n2 dp u n1 = putaran puli penggerak n2 = putaran puli yg digerakkan dp = diameter puli penggerak Dp = diameter puli yg digerakkan 1 u= i  Kecepatan Linear V-Belt : v= d p n1 60 ×1000 (rpm) (rpm) (mm) (mm)
  • 14. Aplikasi V-Belt  Penerus daya pada mesin-mesin kecepatan tinggi, seperti kompresor, dll.  Kipas radiator mobil  Mesin-mesin pertanian  Mesin-mesin industri  Mesin perkakas  Mesin kertas, mesin tekstil, dsb.
  • 15. CONTOH-CONTOH V-BELT wedge v-belt wrapped type classical v-belt raw edge cogged type classical v-belt wrapped type classical double v-belt wedge v-belt raw edge cogged type variable speed v-belt