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\margt760\margb180\margr1660\margl2260 \plain\pard\sl-345 \li8
\ri337 \expndtw-28 \f10 \fs24 Wahyukurniawan.web.id \plain\tx7359
\tab \expndtw1 \b \f20 \fs24 \cf52 2010 \plain\par \pard\sl-469
\li8 \ri5140 \expndtw1 \f20 \fs24 Mechanical Engineering \plain\par
\sl-248\fs25\par\sl-240\fs24\par\par\pard\pard\sl-240 \li2703
\ri3502 \fi765 \ex pndtw-2 \b \f20 \fs24 BAGIAN VI \plain\par
\pard\sl-412 \li8 \ri2736 \fi2695 \expndtw1 \b \f20 \fs24 BANTALAN
(BEARING)
\par
\plain\sl-278\fs28\par\sl-240\fs24\par\par\par\pard\pard\sl-240
\li8 \ri35 \fi56 6 \expndtw1 \f20 \fs24 Bantalan merupakan salah
satu bagian dari elemen mesin ya ng memegang \plain\par
\pard\sl-412 \li8 \ri35 \expndtw1 \f20 \fs24 peranan cukup penting
karena fungsi dari bantalan yaitu untuk menumpu sebuah
\plain\expndtw-1 \f20 \fs24 poros agar poros dapat berputar tanpa
mengalami gese kan yang berlebihan. Bantalan \plain\expndtw0 \f20
\fs24 harus cukup kuat untuk memungkinkan poros serta eleme n mesin
lainnya bekerja \plain\expndtw-7 \f20 \fs24 dengan baik. \plain\par
\pard\sl-412 \li8 \ri1199 \expndtw0 \f20 \fs24 Pada umumya bantalan
dapat diklas ifikasikan menjadi 2 bagian yaitu : \plain\par
\pard\sl-419 \li8 \ri2752 \fi67 \expndtw0 \b \f20 \fs24 1.
Berdasarkan gerakan b antalan terhadap poros \plain\par
\pard\sl-407 \li8 \ri5391 \fi360 \expndtw1 \f20 \fs24 a. Bantalan
luncur \plain\par \pard\sl-415 \li860 \ri32 \expndtw0 \f20 \fs24
Pada bantalan ini terjadi gesekan luncur antara poros dan
bantalan karena \plain\expndtw1 \f20 \fs24 permukaan poros ditumpu
oleh permukaan bantalan denga n perantaraan \plain\expndtw-6 \f20
\fs24 lapisan pelumas.
\par
\plain\sl-317\fs32\par\sl-240\fs24\par\par\par\par\par\par\par\par\par\pard\pard
\sl-269 \li368 \ri1872 \fi2508 \expndtw5 \f21 \fs24 Gambar 6.1
Bantalan Luncur \plain\par \pard\sl-406 \li368 \ri5114 \expndtw1
\f20 \fs24 b. Bantalan gelinding
\par \plain\pard\sl-412 \li860 \ri34 \expndtw1 \f20 \fs24 Pada
bantalan ini terjadi g esekan gelinding antara bagian yang berputar
\plain\par \pard\sl-412 \li860 \ri223 \expndtw-2 \f20 \fs24 dengan
yang diam melalui elemen gelinding seperti bola, rol, dan rol
bulat.
\par
\plain\par \sl-312\fs31\par\pard\pard\sl-240 \li8 \ri37 \expndtw0
\f20 \fs24 Dengan memutar salah satu cincin tersebut, bola
atau rol akan melakukan gerakan \plain\par
\sl-311\fs31\par\pard\pard\sl-240 \li8 \ri33 \expndtw1 \f20 \fs24
gelinding sehi ngga gesekan akan jauh lebih kecil. Untuk bola atau
rol, ketelitian \plain\par \sl-312\fs31\par\pard\pard\sl-240 \li8
\ri35 \expndtw-2 \f20 \fs24 tinggi dengan bentuk dan
ukurannya merupakan suatu keharusan. Karena luas bidang \plain\par
\sl-312\fs31\par\pard\pard\sl-240 \li8 \ri35 \expndtw0 \f20 \fs24
kontak antara bola dan rol dengan cincin sangat kecil, maka
material yang dipakai \plain\par \sl-312\fs31\par\pard\pard\sl-240
\li8 \ri2275 \expndtw-3 \f20 \fs24 harus memil iki ketahanan dan
kekerasan yang sangat tinggi. \plain\par
\sl-312\fs31\par\pard\pard\sl-240 \li8 \ri36 \fi748 \expndtw2 \f20
\fs24 Bantala n gelinding pada umumnya lebih cocok untuk beban
kecil dari \plain\par \sl-311\fs31\par\pard\pard\sl-240 \li8 \ri36
\expndtw0 \f20 \fs24 padabantalan l uncur, tergantung pada bentuk
elemen gelindingnya. Putaran pada \plain\par
\sl-228\fs23\par\sl-240\fs24\par\pard\pard\sl-281 \li8 \ri34
\fi8140 \expndtw2 \ f20 \fs24 3
\par \sect\sectd\sbkpage\margtsxn680\pard
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\plain\pard\sl-345 \li8 \ri337 \expndtw-28 \f10 \fs24
Wahyukurniawan.web.id \plain\tx7359 \tab \expndtw1 \b \f20 \fs24
\cf52 2010 \plain\par \pard\sl-469 \li8 \ri5140 \expndtw1 \f20
\fs24 Mechanical Engineering
\sl-311\fs31\par\pard\pard\sl-240 \li368 \ri4584 \fi360 \expndtw-4
\f20 \fs24 pu taran terhadap gesekan. \plain\par
\sl-312\fs31\par\pard\pard\sl-240 \li8 \ri36 \fi360 \expndtw2 \f20
\fs24 b) Gese kan kerja lebih kecil sehingga penimbulan panas lebih
kecil pada \plain\par \sl-311\fs31\par\pard\pard\sl-240 \li368
\ri4718 \fi360 \expndtw-5 \f20 \fs24 pe mbebanan yang sama.
\plain\par \sl-312\fs31\par\pard\pard\sl-240 \li368 \ri1532
\expndtw-1 \f20 \fs24 c) Penuru nan waktu pemasukan dan pengaruh
dari bahan poros. \plain\par \sl-311\fs31\par\pard\pard\sl-240
\li368 \ri37 \expndtw1 \f20 \fs24 d) Pelumasan terus-menerus
yang sederhana dan hampir bebas pemeliharaan \plain\par
\sl-312\fs31\par\pard\pard\sl-240 \li368 \ri2301 \fi360 \expndtw-1
\f20 \fs24 se rta jumlah bahan pelumas yang jauh lebih sedikit.
\plain\par \sl-312\fs31\par\pard\pard\sl-240 \li8 \ri34 \fi360
\expndtw0 \f20 \fs24 e) Kete litian (presisi), pembebanan yang
diijinkan dan perhitungan dari umur \plain\par
\sl-312\fs31\par\pard\pard\sl-240 \li728 \ri35 \expndtw1 \f20 \fs24
kerja, berhu bungan dengan pembuatan yang bermutu tinggi dalam
pabrik \plain\par \sl-312\fs31\par\pard\pard\sl-240 \li728 \ri357
\expndtw-3 \f20 \fs24 khusus seh ingga memberikan keuntungan dalam
penggunaan suku cadang. \plain\par
\sl-311\fs31\par\pard\pard\sl-240 \li368 \ri3219 \expndtw0 \f20
\fs24 f) Kemampu an menahan beban kejut sesaat. \plain\par
\sl-312\fs31\par\pard\pard\sl-240 \li368 \ri5798 \expndtw0 \f20
\fs24 g) Kebersi han.
\par
\plain\sl-96\fs10\par\sl-240\fs24\par\par\par\par\par\pard\pard\sl-281
\li8148 \ ri34 \expndtw2 \f20 \fs24 4
\par \sect\sectd\sbkpage\margtsxn680\pard
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oading. \plain\expndtw-3 \f20 \fs24 3. Biaya awal yang lebih
tinggi. \plain\expndtw-4 \f20 \fs24 4. Desain yang lebih
rumit.
\par \column \plain\pard\sl-313 \li0 \ri337 \expndtw1 \b \f20 \fs24
\cf52 2010
\par
\sect\sectd\sbknone\plain\sl-285\fs29\par\sl-240\fs24\par\par\par\pard\pard\sl-2
40 \li75 \ri3119 \expndtw0 \b \f20 \fs24 2. Tipe bantalan gelinding
dan penerapa nnya
\par
\plain\sl-134\fs13\par\sl-240\fs24\par\par\par\par\par\par\par\par\par\par\par\p
ar\par\par\par\par\pard\pard\sl-240 \li8 \ri37 \fi708 \expndtw0
\f20 \fs24 Banta lan yang beredar sekarang terdiri dari berbagai
macam bentuk dengan \plain\par \pard\sl-415 \li8 \ri33 \expndtw-2
\f20 \fs24 kelebihan dan kekurangan masing-ma sing. Hal yang perlu
diketahui dalam pemilihan \plain\par \pard\sl-412 \li8 \ri5762
\expndtw-4 \f20 \fs24 bearing antara lain : \plain\par \pard\sl-415
\li8 \ri37 \fi427 \expndtw1 \f20 \fs23 1.\fs24 Mengetahui kemungki
nan penyebab terjadinya kesalahan dan akibatnya. \plain\par
\pard\sl-412 \li795 \ri35 \expndtw1 \f20 \fs24 Bearing yang telah
rusak akan men imbulkan bunyi yang berisik. Dengan \plain\expndtw1
\f20 \fs24 mengetahui dan memahami penyebab kesalahan dan kesala
hannya dapat \plain\expndtw-3 \f20 \fs24 digunakan sebagai dasar
untuk mengatasi masalah sela njutnya. \plain\par \pard\sl-415 \li8
\ri35 \fi427 \expndtw3 \f20 \fs23 2.\fs24 Mengetahui standar
bearing, hal ini untuk memudahkan pemesanan/ \plain\par
\pard\sl-412 \li8 \ri2966 \fi787 \expndtw-3 \f20 \fs24 pembeliannya
jika ada pen ggantian bearing.
\par
\plain\sl-195\fs19\par\sl-240\fs24\par\par\par\par\par\par\par\par\par\par\pard\
pard\sl-281 \li8148 \ri34 \expndtw2 \f20 \fs24 5
\par \sect\sectd\sbkpage\margtsxn680\pard
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\fs24 Mechanical Engineering \plain\par
\sl-248\fs25\par\sl-240\fs24\par\par\pard\pard\sl-240 \li8 \ri4551
\expndtw-3 \b \f20 \fs24 Jenis-jenis bearing antara lain :
\plain\par \pard\sl-407 \li8 \ri4031 \fi348 \expndtw0 \f20 \fs24 1.
Single row groove ball bearings.
\par \plain\pard\sl-415 \li3000 \ri34 \expndtw3 \f20 \fs24 Bearing
ini mempunyai alur dalam pada kedua \plain\expndtw2 \f20
\fs24 cincinnya. Karena memiliki alur, maka jenis ini
\plain\expndtw1 \f20 \fs24 mempunyai kapasitas dapat menahan beban
secara \plain\expndtw0 \f20 \fs24 ideal pada arah radial dan
aksial. Maksud dari beban \plain\expndtw0 \f20 \fs24 radial adalah
beban yang tegak lurus terhadap sumbu \plain\expndtw1 \f20 \fs24
poros, sedangkan beban aksial adalah beban yang \plain\expndtw-5
\f20 \fs24 searah sumbu poros.
\par
\plain\sl-280\fs28\par\sl-240\fs24\par\par\par\pard\pard\sl-240
\li368 \ri3517 \ expndtw0 \f20 \fs24 2. Double row self aligning
ball bearings
\par \plain\pard\sl-415 \li2770 \ri37 \expndtw-3 \f20 \fs24 Jenis
ini mempunyai dua b aris bola, masing-masing baris \plain\expndtw2
\f20 \fs24 mempunyai alur sendiri-sendiri pada cincin bagian
\plain\expndtw-1 \f20 \fs24 dalamnya. Pada umumnya terdapat alur
bola pada cinci n \plain\expndtw2 \f20 \fs24 luarnya. Cincin bagian
dalamnya mampu bergerak \plain\expndtw0 \f20 \fs24 sendiri untuk
menyesuaikan posisinya. Inilah kelebiha n \plain\expndtw0 \f20
\fs24 dari jenis ini, yaitu dapat mengatasi masalah poros y ang
\plain\expndtw-6 \f20 \fs24 kurang sebaris.
\par
\sect\sectd\sbknone\cols2\colno1\colw4598\colsr12\colno2\colw3708
\plain\sl-107\fs11\par\sl-240\fs24\par\par\pard\pard\sl-240 \li368
\ri0 \expndtw 0 \f20 \fs24 3. Single row angular contact ball
bearings
f20 \fs24 5. Double row barrel roller bearings \plain\par
\pard\sl-412 \li4388 \ri37 \expndtw4 \f20 \fs24 Bearing ini
mempunyai dua baris \plain\expndtw3 \f20 \fs24 elemen roller yang
pada umumnya \plain\expndtw1 \f20 \fs24 mempunyai alur berbentuk
bola pada \plain\expndtw4 \f20 \fs24 cincin luarnya. Jenis ini
memiliki \plain\expndtw4 \f20 \fs24 kapasitas beban radial yang
besar \plain\par \pard\sl-415 \li368 \ri3102 \fi360 \expndtw-3 \f20
\fs24 sehingga ideal untuk me nahan beban kejut. \plain\par
\sl-107\fs11\par\sl-240\fs24\par\par\pard\pard\sl-240 \li368
\ri4131 \expndtw0 \ f20 \fs24 6. Single row cylindrical bearings
\plain\par \pard\sl-412 \li5283 \ri36 \expndtw0 \f20 \fs24 Jenis
ini mempunyai dua alur \plain\expndtw-3 \f20 \fs24 pada satu cincin
yang biasanya \plain\expndtw0 \f20 \fs24 terpisah. Eek dari
pemisahan
\par \plain\pard\sl-415 \li5283 \ri37 \expndtw-16 \f20 \fs24 ini,
\plain\tx5844 \tab \expndtw-12 \f20 \fs24 cincin \plain\tx6677 \tab
\expndtw-14 \f20 \fs24 dapat \plain\tx7423 \tab \expndtw-10 \f20
\fs24 bergerak
\par \plain\pard\sl-412 \li5283 \ri37 \expndtw-4 \f20 \fs24 aksial
dengan mengikuti c incin \plain\expndtw0 \f20 \fs24 yang lain. Hal
ini merupakan
\par \plain\pard\sl-412 \li5283 \ri36 \expndtw-14 \f20 \fs24 suatu
\plain\tx6125 \tab \expndtw-7 \f20 \fs24 keuntungan, \plain\tx7620
\tab \expndtw-12 \f20 \fs24 karena \plain\expndtw-10 \f20 \fs24
apabila \plain\tx6507 \tab \expndtw-10 \f20 \fs24 bearing
\plain\tx7739 \tab \expndtw-14 \f20 \fs24 harus
\par \plain\pard\sl-412 \li728 \ri37 \expndtw-1 \f20 \fs24
mengalami perubahan bentuk karena temperatur, maka cincinya
akan dengan \plain\expndtw0 \f20 \fs24 mudah menyesuaikan
posisinya. Jenis ini mempunyai kap asitas beban radial
\plain\expndtw-3 \f20 \fs24 yang besar pula dan juga cocok untuk
kecepatan tingg i.
\par
\plain\sl-298\fs30\par\sl-240\fs24\par\par\par\pard\pard\sl-281
\li8148 \ri34 \e xpndtw2 \f20 \fs24 7
\par \sect\sectd\sbkpage\margtsxn680\pard
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\li8 \ri878 \expndtw-28 \f10 \fs24 Wahyukurniawan.web.id \plain\par
\pard\sl-469 \li8 \ri320 \expndtw1 \f20 \fs24 Mechanical
Engineering \plain\par
\sl-243\fs24\par\sl-240\fs24\par\par\pard\pard\sl-240 \li8 \ri0
\fi360 \expndtw0 \f20 \fs24 7. Tapered roller bearings
\par \column \plain\pard\sl-313 \li0 \ri337 \fi2347 \expndtw1 \b
\f20 \fs24 \cf52 2010 \plain\par
\sl-198\fs20\par\sl-240\fs24\par\par\par\par\par\par\pard\pard\sl-240
\li0 \ri35 \expndtw0 \f20 \fs24 Dilihat dari konstruksinya,
jenis \plain\par \pard\sl-415 \li0 \ri33 \expndtw4 \f20 \fs24 ini
ideal untuk beban aksial \plain\expndtw2 \f20 \fs24 maupun radial.
Jenis ini dapat \plain\expndtw-1 \f20 \fs24 dipisah, dimana cincin
dalamnya
\par \sect\sectd\sbknone\plain\pard\sl-412 \li5031 \ri35
\expndtw-10 \f20 \fs24 dipas ang \plain\tx6334 \tab \expndtw-11
\f20 \fs24 bersama \plain\tx7569 \tab \expndtw-12 \f20 \fs24
dengan
\par \plain\pard\sl-415 \li5031 \ri36 \expndtw-8 \f20 \fs24
rollernya \plain\tx6139 \tab \expndtw-23 \f20 \fs24 dan
\plain\tx6730 \tab \expndtw-12 \f20 \fs24 cincin \plain\tx7543 \tab
\expndtw-11 \f20 \fs24 luarnya \plain\par \pard\sl-412 \li5031
\ri2223 \expndtw-8 \f20 \fs24 terpisah. \plain\par
\sl-283\fs28\par\sl-240\fs24\par\par\par\pard\pard\sl-240 \li368
\ri3753 \expndt w0 \f20 \fs24 8. Single direction thrust ball
bearings
\par \plain\pard\sl-412 \li4311 \ri35 \expndtw2 \f20 \fs24 Bearing
jenis ini hanya co cok untuk \plain\expndtw1 \f20 \fs24 menahan
beban aksila dalam satu arah
\par \plain\pard\sl-412 \li4311 \ri33 \expndtw-14 \f20 \fs24 saja.
\plain\tx5083 \tab \expndtw-10 \f20 \fs24 Elemenya \plain\tx6379
\tab \expndtw-13 \f20 \fs24 dapat \plain\tx7224 \tab \expndtw-8
\f20 \fs24 dipisahkan
\plain\tx3771 \tab \expndtw0 \f20 \fs24 dapat ditahan tergantung
dari kecepatann ya. \plain\expndtw-13 \f20 \fs24 Jenis
\plain\tx3771 \tab \expndtw0 \f20 \fs24 ini sangat sensitif
terhadap ketidakseba risan \plain\par \pard\sl-415 \li728 \ri461
\fi3055 \expndtw-3 \f20 \fs24 (misalignment) poros te rhadap
rumahnya.
\par
\plain\sl-280\fs28\par\sl-240\fs24\par\par\par\pard\pard\sl-240
\li368 \ri3666 \ expndtw0 \f20 \fs24 9. Double direction thrust
ball bearings
\par \plain\sl-107\fs11\par\sl-240\fs24\par\par\pard\pard\sl-240
\li3663 \ri36 \expnd tw3 \f20 \fs24 Jenis ini sama seperti point 8,
hanya saja \plain\par \pard\sl-415 \li3663 \ri38 \expndtw2 \f20
\fs24 bearing jenis ini dapat diberi b eban aksial \plain\expndtw1
\f20 \fs24 dalam dua arah. Bagian-bagiannya pun juga
\plain\expndtw0 \f20 \fs24 dapat dipisahkan sehingga mudah bongkar
dan \plain\expndtw-8 \f20 \fs24 pasangnya.
\par
\plain\sl-166\fs17\par\sl-240\fs24\par\par\par\par\par\par\par\pard\pard\sl-281
\li8148 \ri34 \expndtw2 \f20 \fs24 8
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Wahyukurniawan.web.id \plain\tx7359 \tab \expndtw1 \b \f20 \fs24
\cf52 2010 \plain\par \pard\sl-469 \li8 \ri5140 \expndtw1 \f20
\fs24 Mechanical Engineering
\pard\sl-415 \li8 \ri5718 \fi67 \expndtw0 \f20 \fs24 4. Embedd
ability. \plain\par \pard\sl-412 \li435 \ri33 \expndtw0 \f20 \fs24
Adalah kemampuan bahan bantalan u ntuk mengakomodasi partikel kecil
dari \plain\expndtw-5 \f20 \fs24 debu, pasir dll. \plain\par
\pard\sl-412 \li8 \ri5862 \fi67 \expndtw0 \f20 \fs24 5. Tahan
Korosi. \plain\par \pard\sl-415 \li435 \ri33 \expndtw0 \f20 \fs24
Bahan bantalan tidak boleh menimb ulkan korosi akibat pelumasan.
Properti ini \plain\expndtw3 \f20 \fs24 sangat penting di dalam
mesin pembakaran dimana pelum as yang sama \plain\expndtw1 \f20
\fs24 digunakan untuk melumasi dinding silinder dan bantala n. Di
dalam silinder, \plain\expndtw-3 \f20 \fs24 pelumas dapat saja
teroksidasi dan menghasilkan enda pan karbon. \plain\par
\pard\sl-415 \li8 \ri5081 \fi67 \expndtw0 \f20 \fs24 6. Thermal
konduktivitas. \plain\par \pard\sl-412 \li435 \ri36 \expndtw2 \f20
\fs24 Bahan bantalan harus memiliki kon duktivitas panas yang
tinggi sehingga \plain\expndtw1 \f20 \fs24 memungkinkan perpindahan
panas yang cepat yang dihasi lkan saat terjadi \plain\expndtw-10
\f20 \fs24 gesekan. \plain\par \pard\sl-415 \li8 \ri5657 \fi67
\expndtw0 \f20 \fs24 7. Ekspansi termal. \plain\par \pard\sl-412
\li435 \ri34 \expndtw-2 \f20 \fs24 Bahan bantalan harus memiliki ko
efisien ekspansi termal rendah, sehingga ketika \plain\expndtw2
\f20 \fs24 bekerja dengan suhu yang berbeda-beda, tidak ada peru
bahan bahan yang \plain\expndtw-4 \f20 \fs24 diakibatkan perubahan
suhu.
\par
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\li8148 \ri34 \expndtw2 \f20 \fs24 9
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\tab \expndtw1 \b \f20 \fs24 \cf52 2010 \plain\par \pard\sl-469
\li8 \ri5140 \expndtw1 \f20 \fs24 Mechanical Engineering