KELOMPOK III DESIGN ELEMEN EMSIN 2 TANSMISI SABUK, RANTAI, DAN KOPLING
OLEH WILSEN LATUNDA GINTING ANDRI WIILY ARDIANTA PERNANDO SIMAREMARE FRENCHO AGUSTINUS S BAHRUN NIZAM LUBIS MALIK ARIFIN REYNOLD PATRIA ANDRI S ALFIAN ALIFER MUHAMMAD JASA Nst RAHMAN SONOWIJOYO
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DEPARTEMEN TEKNIK MESIN
UNIVERSITAS SUMATRA UTARA MEDAN 2013/2014
1
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KATA PENGANTAR
Puji dan syukur kapada Tuhan Yang Maha Esa karena atas berkat-Nyalah penulis mampu menyelesaikan laporan ini tepat pada waktunya. Tugas makalah ini ditulis dengan tujuan memenuhi mata kuliah Design Elelem Mesin 2 dengan judul Tansmisi Sabuk, Rantai dan Kopling Dalam pembuatan laporan ini penuilis telah banyak mendapat dukungan moral dan bantuan baik secara materil ataupun administrasi. Oleh karena itu sudah sepantasnya penulis mengucapkan banyak terimakasih kepada seluruh pihak yg bersangkutan. Akhir kata penulis berharap akan adanya kritikan dan saran yang membangun untuk perbaikan laporan ini dikemudian hari. Terima kasih.
Medan,
Penulis,
April 2014
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DAFTAR ISI
BAB I TRANSMISI .............................................. .................................................................... ............................................ ...................................... ................ 1 A. Transmisi langsung ................................................. ....................................................................... ............................................ ............................... ......... 1 B. Transmisi Tak Langsung .......................................................... ................................................................................. ................................... ............ 2 BAB II Transmisi Sabuk(Belt) ................................................ ...................................................................... .......................................... .................... 3 A. Pendahuluan Transmisi Sabuk ........................................... ................................................................. .......................................... .................... 3 B. Jenis Belt Drives (Timing Belt) ............................................. ................................................................... ...................................... ................ 6 C. Jenis-jenis transmisi sabuk : ........................................... ................................................................. ............................................ ........................ 7 D. Jenis Sabuk ............................................. .................................................................... ............................................. ............................................ ........................ 9 E. Transmisi Sabuk – Sabuk – V.................... V........................................... .............................................. ............................................. .................................. ............ 10 F.
Timing Belt (Sabuk Gilir) ........................ .............................................. ............................................. ............................................. ........................ 13
G. Bahan yang digunakan untuk sabuk ................................................. ........................................................................ ........................... .... 16 H. Tekanan pada sabuk ............................. .................................................... ............................................. ............................................. ........................... .... 18 I.
Kecepatan sabuk .......................................... ................................................................ ............................................ .......................................... .................... 18
J.
Koefisien gesek antara puli dan sabuk.......................................... ................................................................. ............................... ........ 18
K. Sambungan sabuk ............................................ .................................................................. ............................................ ...................................... ................ 19 L.
Jenis gerakan pada sabuk datar .......................................... ................................................................ .......................................... .................... 20
BAB III TRANSMISI RANTAI ........................................... ................................................................. ............................................ ........................ 23 A. Pendahuluan Transmisi Rantai ............................................................. ................................................................................... ........................ 23 B. Jenis- jenis Rantai : .............................. ..................................................... ............................................. ............................................. ........................... .... 23 1.
Rantai Rol ............................................ .................................................................. ............................................ .......................................... .................... 23
2.
Rantai Gigi (SILENT CHAIN) ........................................... ................................................................. .................................. ............ 24
3.
Rantai Lingkaran yang dapat dilepaskan ......................................... ............................................................. .................... 27
4.
Rantai Pintle Kelas 400 .......................................... ................................................................ ............................................ ........................ 27
5.
Rantai Penggilinagn “H” ........................................... ................................................................. .......................................... .................... 28
6.
Rantai tarikan “H” .......................................... ................................................................ ............................................ ............................... ......... 28
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10. Rantai Bushed kelas 800 ........................................... ................................................................. .......................................... .................... 29 11. Rantai Kombinasi .......................................... ................................................................ ............................................ ............................... ......... 29 12. Rantai Penggulung lunak/dapat tempa ............................................ ................................................................ .................... 30 13. Rantai Baja Mesin yang dibus-kan .......................................... ................................................................. ........................... .... 30 14. Rantai tanpa paku yang ditempa ........................................... .................................................................. ............................... ........ 30 15. Rantai baja yang dilas ............................................ ................................................................... ............................................. ........................ 31 16. Rantai Khusus ............................................. .................................................................... ............................................. .................................. ............ 31
BAB III TRANSMISI TRANSMISI
KOPLING ......................................... ............................................................... .......................................... .................... 32
A. Pendahuluan Kopling ......................................... ............................................................... ............................................ ............................... ......... 32 B. Klasifikasi Kopling ....................................................... ............................................................................. .......................................... .................... 32 1. Kopling Tetap .......................................... ................................................................. ............................................. .................................. ............ 32 2. Kopling Tidak Tetep ........................................... .................................................................. ............................................. ........................ 35
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BAB I TRANSMISI Transmisi adalah suatu alat untuk meneruskan tenaga dan putaran dari poros satu ke poros yang lain dan dibantu dengan alat yang sesuai kebutuhan , misalnya alat itu adalah rantai, sabuk, kopling, dll.
Secara umum transmisi di bedakan menjadi 2 macam yaitu : A. Transmisi langsung
Transmisi langsung digunakan digunakan untuk menyalurkan menyalurkan tenaga dan putaran putaran pada jarak yang dekat and posisi yang segaris antara poros penggerak dengan yang digerakkan. Sistem ini sering disebut dengan transmisi roda gigi, karena cara kerjanya kontak secara langsung antara elemen poros penggerak dengan yang digerakan. Adapun kelebihan dan kelemahan pada transmisi ini di antaranya: a.
kelebihan
-
tidak terjadi slip
-
dapat memindahkan daya yang besar
-
dapat digunakan untuk putaran tinggi dan tepat
-
ringkas tidak memerlukan tempat yang luas
-
dapat memindahkan daya dengan putaran stabil
b.
kelemahan
-
perlu ketelitian tinggi dalam perencanaannya, sampai perawatannya.
-
Biaya pembuatan yang cukup mahal.
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B. Transmisi Tak Langsung
Pada transmisi ini tidak terjadi kontak elemen poros dengan poros yang digerakkan melainkan melalui elemen suatu transmisi yang menghubungkan kedua poros. Transmisi ini digunakan jika kedua poros letaknya saling berjauhan. Adapun kelebihan dan kelemahan pada transmisi ini di antaranya: a.
kelebihan
-
dapat meneruskan daya antara poros yang berjauhan
-
tidak perlu ketelitian yang tinggi dalam perencanaan
-
biaya pembuatan dan perewatannya cukup murah
b.
Kelemahan
-
memerlukan tempat yang lebih luas
-
lebih sering terjadi slip
-
tidak dapat digunakan dengan putaran tinggi.
Gambar Sabuk dan Rantai yang perupakan contoh Tansmisi Tidak Langsung
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BAB II Transmisi Sabuk(Belt)
M. Pendahuluan
Tranmisi sabuk merupakan salah satu jenis system transmisi. Tenaga/daya/momen puntir ditransmisikan dari poros yangsatu keporos yang lain melalui sebuah belt yang melingkar pada puli yang terpasang pada poros. poros. Kedudukan poros yang yang satu dengan poros yang lain dapat sejajar ataupun menyilang. Kemampuan transmisi dari system ini sangat ditentukan oleh karakter gesekan antara sabuk dan permukaan puli. Oleh sebab itu besarnya gaya tegang dalam sabuk(yang mengakibatakan tegangan tarik) menentukan besarn ya momen puntir yang dapat ditransmisika.
Keuntungan Dari Sisitem Transmisi Belt (dibandingkan dengan system transmisi roda gigi atau rantai).: 1. Tidak berisik. 2. Dapat menerima dan meredam beban kejut. 3. Jarak poros tidak tertentu. 4. Dipandang dari segi konstruksi dan pembuatan, mudah dan murah. 5. Hanya memerlukan sdikit perawatan (tanpa menggunakan pelumas).
Kerugian dari system transmisi Belt: 1. Slip yang terjadi mengakibatkan rasio angka putaran tidak konstan. 2. Diukur dari besarnya tenaga yang ditransmisikan, system transmisi sabuk memerlukan dimensi/ukuran yang lebih besar daripada system transmisi roda gigi gigi maupun rantai.
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c.
Kelompok yang ketiga sabuk dengan gigi yang digerakkan dengan sproket pada jarak pusat sampai mencapai 2 (m), dan meneruskan putaran secara tepat dengan perbandingan antara 1/1 sampai 6/1.
Sebagian besar transmisi sabuk menggunakan sabuk – V V karena mudah penanganannya dan harganyapun murah. Kecepatan sabuk direncanakan untuk 10 sampai 20 (m/s) pada umumnya, dan maksimum sampai 25 (m/s). Daya maksimum yang dapat ditransmisikan kurang lebih sampai 500 (kw).
Sabuk atau tali yang digunakan untuk mengirimkan daya dari satu poros yang lain melalui katrol yang berputar di kecepatan yang sama atau pada kecepat an yang berbeda . Jumlah daya ditransmisikan tergantung pada faktor-faktor berikut : 1 . Kecepatan sabuk . 2 . Ketegangan di mana sabuk ditempatkan pada katrol . 3 . Busur kontak antara belt dan kecil katrol . 4 . Kondisi di mana sabuk digunakan .
Dapat dicatat bahwa ( a) Poros harus benar sejalan untuk memastikan seragam ketegangan di seluruh bagian sabuk . ( b) katrol tidak boleh terlalu berdekatan , dalam rangka bahwa busur dari kontak pada pulley pulley yang lebih kecil mungkin sebagai besar mungkin ( c) katrol tidak ti dak boleh begitu jauh untuk menyebabkan sabuk untuk menimbang berat p ada
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tidak boleh lebih dari 10 meter dan minimum tidak boleh kurang dari 3,5 kali diameter dari katrol yang lebih besar
Berikut ini adalah berbagai faktor penting yang di atasnya pemilihan belt drive tergantung:
1. Kecepatan mengemudi dan didorong shaft, 2. Rasio pengurangan kecepatan, 3. Kekuatan yang akan dikirim, 4. Pusat jarak antara poros, 5. Persyaratan berkendara positif, 6. Poros tata letak, 7. Ruang yang tersedia, dan 8. Kondisi pelayanan.
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N. Jenis Belt Drives (Timing Belt)
Sabuk drive biasanya digolongkan ke dalam tiga ti ga kelompok berikut: 1. Light drives. Ini digunakan untuk mengirimkan kekuatan kecil pada kecepatan belt sampai sekitar 10 m / s mesin sebagai in agricultural dan peralatan mesin kecil.
2. Medium drives. Ini digunakan untuk mengirimkan kekuatan media pada kecepatan belt lebih dari 10 m / s sampai dengan 22 m / s,
3. Heavy drives. Ini digunakan untuk mengirimkan kekuatan besar pada kecepatan belt di atas 22 m / s keatas , seperti pada kompresor dan generator.
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O. Jenis-jenis transmisi sabuk :
1. Transmisi sabuk lurus.
Kebanyakan jenis transmisi sabuk ini dipakai untuk puli yang berputar dengan arah yang sama dan poros dimana puli tersebut terpasang mempunyai mempunyai garis sumbu yang sejajar dan horizontal, tetapi dapt juga diapakai untuk poros vertical, maupun miring.
a. Transmisi sabuk tanpa penegang Akibat beratnya sendiri, sabuk tidak perlu diberi gaya tegang (gaya tarik) la gi. Ini dipakai untuk poros dengan kedudukan horizontal dan yang yang memiliki jarak poros (La)>5m. Untuk tujuan ini, maka maka sisi tegang/tarik darisabuk diletakkan dibagian bawah.
b. Transmisi sabuk mulur Karena sabuk lebih pendek dari pada jarak poros La, maka sewaktu dipasang pada puli sabuk menjadi bertambah panjang secara elastic. Sistem ini dipakai untuk untuk jarak poros La<5m La<5m dan juga untuk porosdengan porosdengan kedudukan vertical maupun miring. Pemeriksaan tegangan pada sabuk ini harus selalu dilakukan jika terdapat kelembaban udara dan temperatur yang berubah-ubah.
c. Transmisi sabuk dengan puli penegang Puli penegang menekan sisi kendor dari sabuk didekat puli kecil dari luar dan dengan demikian sudut lilit/kontak menjadi bertambah besar. Puli penegang penegang ini bekerja atas dasar beratnya sendiri atau kerena kerja sebuah pegas. Penggantian arah putaran pada system ini tidak mungkin (harus dihindari).
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2. Transmisi sabuk silang.
Semakin lama senkin jarang pemakain transmisi sabuk silang untuk arah putaran puli yang berlawanan dan puli terletak pada sumbu yang sejajar, karena disamping pembebanan puli yang itdak menguntungkan menguntungkan akibat gaya puntir tambahan, bagian tepi dari sabuk juga cepat aus, teruatam pada sabuak rata yang lebar. Untuk keperluan sumbu poros dari puli yang bersilangan dengan sembarangan sudut, maka maka diperlukan rol pemandu sabuk rata. Untuk menghindarkan lepasnya sabuk dari puli, maka bagian sabuk dari sisi tarik harus l urus, sedangkan pada sisi kendor dapat miring.
Transmisi sabuk juga dapat di rancang:
a. Sebagai transmisi henti-kerja dengan semacam mekanisme seperti roda gigi geser. Biasanya, untuk tujuan henti-kerja dipasangka sebuah kopling yang langsung disambung dengan puli. b. Sebagai transmisi dengan angka putaran putaran bertingkat. Biasanya sabuk dipindahkan dari pasangan puli yang satu ke yang lain dengan tangan/ manual setelah dikendorkan lebih dahulu.
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P. Jenis Sabuk
Meskipun ada banyak jenis sabuk digunakan hari ini, namun berikut ini adalah penting dari sudut pandang subjek:
1. Sabuk datar. Sabuk datar seperti ditunjukkan ditunjukkan pada Gambar (a), banyak digunakan digunakan di pabrik-pabrik dan bengkel, di mana jumlah sedang daya yang yang akan dikirim, dari satu katrol yang lain ketika dua puli tidak lebih dari 8 meter terpisah.
2. V-belt. Sabuk V-belt seperti ditunjukkan ditunjukkan pada Gambar (b), banyak digunakan digunakan di pabrik-pabrik dan bengkel, di mana sejumlah besar daya yang akan dikirim, dari satu katrol yang lain, ketika dua puli sangat dekat satu sama lain.
3. Sbuk melingkar atau tali. Sabuk melingkar atau tali seperti ditunjukkan pada Gambar Gambar (c) pada umumnya digunakan pada thefactories dan lokakarya, di mana sejumlah besar daya yang akan dikirim, dari satu katrol yang lain, ketika dua puli lebih dari 8 meter t erpisah.
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Q. Transmisi Sabuk – Sabuk – V V
Sabuk – V terbuat dari karet dan mempunyai penampang trapesium. Tenunan tetoron atau semacamnya dipergunakan sebagai inti sabuk untuk membawa tarikan yang besar. Sabuk – V V dibelitkan disekeliling alur puli yang berbentuk V pula. Bagian sabuk yang sedang membelit pada puli mengalami lengkungan sehingga lebar bagian dalamnya akan bertambah besar. Gaya gesekan juga akan bertambah karena pengaruh bentuk baji, yang akan menghasilkan transmisi daya yang besar pada tegangan yang relatif rendah. Hal ini merupakan salah satu keunggulan sabuk – sabuk – V V dibandingkan dengan sabuk yang lain.
1. Jenis V-belt dan pulley
Menurut Standar India (IS: 2494-1974), V-sabuk yang dibuat dalam lima jenis yaitu A, B, C, D dan E.
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2. Konstruksi dan ukuran penampang sabuk-V
3. Berbagai macam sabuk-V beserta kelebihan dan kekurangannya
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3. Untuk mesin-mesin pertanian. Puli penegang pada keliling luar sabuk dapat dipakai. 4. Batas temperatur sampai 600C. (Untuk temperatur lebih dari 600C lebih baik dipakai sabuk-V unggul. (E)
1. Sabuk-V sempit 2. Dapat mentransmisikan daya besar. 3. Untuk mesin-mesin industry umum. 4. Batas temperatur sampai 900C.
(F)
1. Sabuk-V sudut lebar 2. Untuk transmisi kecepatan tinggi dan daya besar dengan puli kecil dan sempit. 3. Untuk otomobil. 4. Batas temperatur sampai 800C.
(G)
1. Sabuk-V putaran variable. 2. Tahan lenturan dan tekanan samping 3. Untuk penurun putaran variable. 4. Batas temperatur sampai 900C.
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R. Timing Belt (Sabuk Gilir)
Sabuk gilir terdiri atas sabuk dengan gigi yang digerakkan dengan sproket pada jarak pusat sampai mencapai 2 m, dan meneruskan putaran
secara
tepat
dengan
perbandingan 1/1 sampai 6/1. Batas maksimum kecepatan sabuk gilir kurang lebih 35 m/s dan daya yang dapat 60 kW.
diransmisikan adalah sampai
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Macam-macam Macam-macam sabuk gigi beserta kelebihan dan kekurangannya
(A)
1. Sabuk gigi penampang pendek. 2. Tahan lenturan dan kecepatan tinggi. 3. Untuk otomobil besar. 4. Batas temperatur sampai 900C.
(B)
1. Sabuk segi-enam. 2. Untuk menggerakkan poros banyak 3. Untuk mesin pertanian dan mesin industri 4. Batas temperatur sampai 600C.
(C)
1. Sabuk bergigi (sabuk gilir)
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S. Bahan yang digunakan untuk sabuk
Bahan yang digunakan untuk tali dan sabuk harus kuat, fleksible dan tahan lama . material tersebut harus mempunya I koefisien gesek yang tinggi.bahan yang digunakan untuk sabuk diklasifikasikan sebagai berikut: 1. Sabuk kulit
Bahan yang paling utama untuk sabuk datar adalah kulit. Sabuk kulit dibuat dari 1-2 meter sampai 1.5 meter potongan dari bagian sisi tulang punggung sapi mudal. Bagian sisi kulit lebih keras dan lebih lembut dibanding sisi daging. Tetapi sisi daging lebih kuat. Serat pada sisi kulit tegak lurus kepada permukaan. Sedang sisi kilat pada itu adalah interwoven dan paralel kepada permukaan kulit. Oleh karena itu untuk pertimbangan ini sisi rambut suatu sabuk harus dalam hubungan dengan permukaan puli yang ditunjukan pada gambar. 17-2. Ini memberi suatu menghubungi antara sabuk dan puli dan tempat kekuatan-tarik terbesar dari
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teratur. Karena sabuk kapas memerlukan perlakuan ringan, oleh karena itu sabuk ini kebanyakan digunakan di dalam permesinan kebun, sabuk an gkut dll. 3. Sabuk karet
Karet Sabuk dibuat dari lapisan pabrik yang diisi dengan komposisi karet dan mempunyai suatu lapisan karet yang tipis pada permukaannya. Sabuk ini sangat fleksibel tetapi dengan cepat hancuroleh panas, minyak atau pelumas. Salah satu keuntungan sabuk ini adalah mudah di buat dan diaplikasikan. Sabuk ini baik di gunakan untuk penggilingan gergaji, pabrik kertas dan tempat yang lembab. 4. Sabuk balata
Sabuk ini adalah berupa sabuk karet atau getah yang digunakan sebagai pengganti karet. Sabuk ini tahan asam dan tahan air dan tidak rusak oleh minyak hewani atau alkali. Sabuk tidak boleh melebihi dari 40°C sebab pada temperatur ini sabuk mulai lembek dan menjadi lengket. Kekuatan balata sabuk adalah 25% lebih tinggi dibanding sabuk karet.
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T. Tekanan pada sabuk
Kekuatan akhir(ultimate stenght) sabuk kulit bervariasi dari 210 kg/cm3 sampai 350 kg/cm3 dan faktor keamanan diambil 8 sampai 10. Bagaimanapun, pemakaian/ pengausan suatu sabuk lebih penting dibanding kekuatan nyata. Hal tersebut telah ditunjukkan oleh pengalaman itu di bawah rata-rata kondisi-kondisi suatutekanan yang bisa diijinkan 28 kg/cm3 atau lebih sedikit akan memberi suatu kondisi sabuk yang layak. Suatu tekanan yang
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W.
Karet
0-30
0-18
-
0-32
0-35
0-40
0-42
Balata
0-32
0-20
-
0-35
0-33
0-40
0-42
Sambungan sabuk
Sabuk yang tak ada akhirnya tidaklah tersedia, kemudian sabuk memotong dari gulungan
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X. Jenis gerakan pada sabuk datar
Energi dari suatu puli di transmisikan kemanapun. Berikut jenis gerakan pada sabuk datar: 1. gerakan sabuk terbuka
Gerakan sabuk terbuka ditunjukkan di dalam gambar 17.4, jenis ini digunakan diporos Berputar dan paralel yang diatur ke arah yang sama. Ketika memusat jarak antara kedua poros besar, kemudian sisi yang ketat sabuk harus lebih rendah. rendah.
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6. gerakan langkah atau puli tirus. Gerakan langkah atau puli tirus. ditunjukkan di dalam gambar 17.10. digunakan untuk mengubah kecepatan dari gerakan poros utama bergerak kecepatan tetap. ini terpenuhi dengan pergeseran sabuk dari satu memisahkan dari langkahlangkah kepada lainnya.
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BAB III
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yang menyebabkan rantai bekerja dengan gesekan yang minimum serta keausan yang
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