Traditional automotive wheel bearing is composed of two tapered roller bearings or ball bearing combination , bearing installation , oiled , sealed and adjust clearance are carried out in the car on the production line . This structure makes it difficult in the automotive assembly plants , high costs, poor reliability, and car maintenance will also be required to maintain the bearing cleaning, oiling and adjustment. Developed on the basis hub bearing unit is the standard angular contact ball bearings and tapered roller bearings on , it will be two sets of bearings as a whole, has assembled a good performance, can be omitted clearance adjustment , light weight , compact, load capacity large , sealed bearings can be pre- loaded into the grease, of the hub seals and maintenance, etc. are omitted from the outside , is already widely used in cars , in the truck also has a tendency to gradually expand the application .
According Hengding automobile hub unit learned that when you install bearings should clean environment, small particles from entering the bearing will shorten bearing life. Replacement of bearings to maintain a clean environment is very important . Not allowed to use a hammer percussion bearings, bearings do not pay attention to fall on the ground ( or similar misconduct ) . Before mounting the shaft and housing should also check the status of even slight wear will lead to poor fit , thereby causing early failure of the bearing .
Magnetometer equipped with ABS wheel hub bearing thrust ring , thrust ring mounted in order to determine which side , you can use something a little lighter near the edge of the bearing , magnetic bearings will be attracted by it generated . When installing the magnetic thrust belt loop while pointing inside , is on the ABS sensor . Note : Incorrect installation may lead to functional brake system failure.
The ring is equipped with ABS unit has a magnetic thrust bearing ring , which is not subject to the thrust ring collision , impact or collision with other field . Remove from the box before installation , so that they stay away from magnetic fields , such as the use of electric motors or electric tools. When installing these bearings , the road test by observing the dashboard ABS alarm pin to change the bearing operation.
The hub bearing unit , do not attempt to disassemble or adjust the wheel hub bearing seal unit , otherwise it would lead to water damage to seals or dust. Even ring and the inner ring raceway are damaged , resulting in permanent failure of the bearing.
Since the installation of the lock nut and bearing different bearing types , the size difference between the torque is great. Note reference to the relevant instructions.
Automotive wheel bearing repair and maintenance of what is important automotive wheel bearings walking parts. Wheel bearings reduce friction bears chassis when operating , maintaining normal driving task. If a wheel bearing failure , may cause the phenomenon of noise , bearing fever , especially the front wheel is more obvious, easily lead to runaway direction dangerous phenomenon . Therefore , wheel bearings must be scheduled for maintenance.
Automotive wheel bearing checking Hengding automobile wheel hub unit to your 11 o'clock the following suggestions:
(1 ) Check the tightness of wheel bearings , first inspected the car at one end of the wheel hub axle set up , with the support car stool , wood and other appliances to cover the car safely stand a good car .
( 2 ) Rotate the wheel turns inspected to see if the rotation is stable, if there is no abnormal noise. If the rotation is not smooth and friction sound , indicating that the brake part is not normal ; If there is no noise, and the rotation is not smooth when ebbed and flowed , indicating that the bearing part is not normal. When the above irregularities should be dismantling the hub . For small cars, checking wheel bearings, with both hands up and down the side of the tire, the tire pulled his hands back and forth , repeat several times. If normal, then there should be no feeling of Songkuang and arrest ; If there are obvious Songkuang swing feel , should be overhauled wheels.
( 3 ) Check the braking areas . Usually when checking wheel bearings, check the wheels with brakes, tires if there are traces of oil inside , probably the brake cylinder or brake lines caused by the oil spill , it is timely to identify the reasons , be excluded.
2 automotive wheel bearing maintenance before demolition wheels, wheel maintenance should do the preparatory work , parked the car and set up the axle to ensure the maintenance of safe operations.
( 1 ) Remove the hub shaft head decorative cover , dust cover ;
( 2 ) Remove the tire and tire nut , be careful not to bruise the tire bolt threads. If the disc brakes, the brake should be removed , and then used pliers to remove the lock ring or locking pin .
( 3 ) with a special tool to remove the hub ;
( 4 ) scrape bearings, journal and hub cavity old grease , cleaning wheel bearings and journal with a cleaning agent and wipe with a cloth , wipe with a cloth wheels last cavity .
( 5 ) Check the wheel bearings and bearing races , found cracks, fatigue spalling and other phenomena loose roller bearings , replace bearings. If you find pitting on the bearing race , it should replace the bearings .
When cope with the situation ( 6 ) Check the bearing bore and the journal , with the gap should not exceed 0.1Omm measuring journal , should be in the upper and lower parts of the vertical ground ( where the largest wear parts ) measurements. If used with the gap exceeds the limit , replace the bearings, so back to normal with the gap . Burr is not allowed to play , pitting the journal to narrow the gap .
(7 ) Subject to all parts meet the requirements, apply grease to the bearing after release hub .
When ( 8 ) Apply grease to the bearing cavity attention should grease the bearing until grease to squeeze until the smoke from the other side of the bearing . In the hub and shaft cranial cavity Apply a thin layer of grease to make it play a role in rust . Note that the hub cavity smear of grease do too much , otherwise it will affect the cooling and braking.
( 9 ) the hub and outer bearing back onto the journal , hand -axis head adjustment nut and shaft torque wrench required to tighten the adjusting nut . After tightening the nut , turn the wheel a few times to be around to see the bearing installation ; on the other hand , by turning the bearing and seat properly fit. At this time bearing tightness appropriate wheels to rotate freely and not feel the axial clearance.
( 10 ) Finally, in order to install the locking plate , lock nut , tires, dust cover and decorative cover and other parts.
( 11 ) After adjusting wheel bearings , with some mileage ( about 1Okm), stop and check for temperature swab touched wheels , if fever, is caused by the bearing adjustment too tight , should be re- adjusted , proper relaxation bearing tightness .
In addition to the maintenance of several systems , respectively , can also be cleaned and the whole chassis membrane protection , anti- aging and rusting chassis , for some exotic foreign matter , etc. can tap play a role in resisting .
