美國(guó)national油封timken油封486125油封486319油封

上幫國(guó)際貿(mào)易（上海）有限公司提供美國(guó)national油封timken油封486125油封486319油封。

美國(guó)NATIONAL油封TIMKEN油封486125油封486319油封

national oil seals是1920年由lioyd a.johnson創(chuàng)立的，專門(mén)從事油封、墊圈墊片的生產(chǎn)，在當(dāng)時(shí)就已經(jīng)是美國(guó)-的油封生產(chǎn)廠家之一，為汽車和飛機(jī)的主要配套油封工廠。于1956年被federal-mogul攬于旗下。f-m公司是一家綜合性的汽車零配件廠家，從1899年成立至今，通過(guò)不斷的發(fā)展和并購(gòu)，擁有了一系列的汽車零部件品牌，產(chǎn)品包括軸瓦、引擎、雨刷、火花塞、軸承、油封、活塞環(huán)、制動(dòng)系統(tǒng)、墊圈和底盤(pán)系統(tǒng)等等，成為了全球-的汽車零部件供應(yīng)商。

national油封在市場(chǎng)上常見(jiàn)的型式如左所示的截面圖。油封分內(nèi)包骨架油封和外露骨架油封，帶自緊彈簧式和無(wú)自緊彈簧式。但national油封主要以外露骨架為主，常用的有41、45、47、48系列。外骨架油封相對(duì)于內(nèi)骨架油封來(lái)言，剛性好、定位準(zhǔn)確、同軸度高、導(dǎo)熱散熱好、加工精度高、要求膠與金屬之間有較高的粘合強(qiáng)度。

而national油封與其它品牌的-不同之處，就是在鐵殼外圈的外徑上噴涂了紅色的redicoat-涂漆，一方面可以區(qū)別其它品牌的顏色，另一方面，也是主要的方面，鐵殼外徑噴涂紅漆可增加外徑的密封性能，可填充裝配孔腔表面之缺陷或刮痕，避免密封流體由外徑泄漏。這種redicoat涂漆，對(duì)孔腔面的加工光潔度就有所放松，允許有較大的表面粗糙度，同樣起到內(nèi)骨架油封(外徑包有橡膠)的密封效果

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