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Lubrication, sealingWheel bearings are almost exclusively lubricated withgrease. <strong>Bearing</strong>s which have no integrated seals are normallysealed with spring-preloaded shaft seals with specialdust lips. Sealed bearings such as the double-rowangular contact ball bearings with for-life lubrication,which are widespread in passenger cars, normally havea combination <strong>of</strong> dust shield and seal. Experience hasshown that these seals are satisfactory if the design providesan additional gap-type seal. Collecting groovesand baffles are also required to protect the bearingsagainst dust and splash water.35 Driven and steered front wheel <strong>of</strong> a front drive passenger carOperating dataWheel load 4,600 N; tyre size 175/70 R14;r dyn = 295 mm; maximum speed 180 km/h.<strong>Bearing</strong> selection<strong>The</strong> bearing arrangement is made up <strong>of</strong> a sealed double-rowFAG angular contact ball bearing.<strong>The</strong> bearing is greased for life with FAG rolling bearinggrease.<strong>The</strong> bearing arrangement <strong>of</strong> a driven and non-steeredrear wheel <strong>of</strong> a rear drive passenger car may also be designedlike this.35: Passenger-car front wheel55 FAG
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