automobile bearing

car special wheel hub bearings:
Auto Parts
The main function of the automobile wheel bearing is to support the load and provide precise guidance for the rotation of the wheel hub. It bears both axial load and radial load, and is a very important component. Traditional automobile wheel bearings are composed of two sets of tapered roller bearings or ball bearings. The installation, oiling, sealing and clearance adjustment of the bearings are all carried out on the automobile production line. This structure makes it difficult to assemble in automobile production plants, high cost, and poor reliability. Moreover, when the car is maintained at the maintenance point, the bearings need to be cleaned, oiled and adjusted. The wheel hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It integrates two sets of bearings. It has good assembly performance, can omit clearance adjustment, light weight, compact structure, and load capacity. Large, sealed bearings can be loaded with grease in advance, external hub seals are omitted, and maintenance is avoided. It has been widely used in cars, there is also a trend of gradual expansion of applications in trucks.
The main function of the special wheel hub bearing for automobiles is to bear the load and provide precise guidance for the rotation of the wheel hub.
Installation and use of common sense: the wheel bearings of cars used to use single-row tapered roller or ball bearings in pairs. With the development of technology, the car has been widely used car hub unit. The use of hub bearing units and the use of increasing, has developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange on the outer raceway for fixing the bearing, which can be simply fixed on the axle with a nut. Make the maintenance of the car easy. The third-generation hub bearing unit adopts the bearing unit and the anti-lock brake system ABS. The hub unit is designed with an inner flange and an outer flange, the inner flange is bolted to the drive shaft, and the outer flange mounts the entire bearing together. Worn or damaged hub bearings or hub units will cause inappropriate and costly failures of your vehicle on the road, and even cause damage to your safety. Please pay attention to the following matters in the use and installation of wheel hub bearings: 1. In order to ensure maximum safety and reliability, it is recommended that you always check the wheel hub bearings regardless of the age of the car-pay attention to the early warning signs of bearing wear: Including any friction noise during rotation or abnormal deceleration of the suspension combination wheel when turning. For rear-wheel drive vehicles, it is recommended that the front wheel hub bearings should be lubricated when the vehicle travels to 38000 kilometers. When replacing the brake system, check the bearing and replace the oil seal. 2. If you hear the noise from the hub bearing part, first of all, it is important to find the location of the noise. There are many moving parts that may produce noise, and it is also possible that some rotating parts are in contact with non-rotating parts. If it is confirmed that the noise is in the bearing, the bearing may be damaged and needs to be replaced. 3. Because the working conditions of the front wheel hub causing the failure of the bearings on both sides are similar, even if only one bearing is broken, it is recommended to replace it in pairs. 4. The hub bearing is more sensitive, and the correct method and appropriate tools are required in any case. In the process of storage, transportation and installation, the bearing parts can not be damaged. Some bearings require greater pressure to press in, so special tools are required. Be sure to refer to the car manufacturing instructions. 5. When installing the bearing, it should be in a clean and tidy environment. Small particles entering the bearing will shorten the service life of the bearing. It is very important to maintain a clean environment when replacing bearings. It is not allowed to hit the bearing with a hammer, and pay attention to the bearing not to fall to the ground (or similar improper handling). Before installation, the condition of the shaft and bearing seat should also be checked. Even minor wear can lead to poor fit, resulting in early failure of the bearing. 6. For the hub bearing unit, do not attempt to disassemble the hub bearing or adjust the sealing ring of the hub unit, otherwise the sealing ring will be damaged and water or dust will enter. Even the raceway of the sealing ring and the inner ring are damaged, resulting in permanent failure of the bearing. 7. There is a magnetic thrust ring in the sealing ring equipped with ABS device bearing. This thrust ring cannot be subject to collision, impact or collision with other magnetic fields. Remove from the box before installation and keep them away from magnetic fields, such as motors or power tools. When installing these bearings, change the operation of the bearings by observing the ABS alarm pin on the instrument panel through the road condition test. 8. For hub bearings equipped with ABS magnetic thrust ring, in order to determine which side of the thrust ring is installed, you can use a light and small thing * close to the edge of the bearing, and the magnetic force generated by the bearing will attract it. When installing, point the side with the magnetic thrust ring to the inside, facing the sensitive element of ABS. CAUTION: INCORRECT INSTALLATION MAY CAUSE A FUNCTION OF THE BRAKE SYSTEM. Many bearings are sealed, and these bearings do not need to be greased throughout their life. Other unsealed bearings such as double row tapered roller bearings must be greased during installation. Because the size of the inner cavity of the bearing is different, it is difficult to determine how much grease is added. The most important thing is to ensure that there is grease in the bearing. If there is too much grease, when the bearing rotates, the excess grease will seep out. General experience: during installation, the total amount of grease should account for 50% of the bearing clearance. 10. When installing the lock nut, the torque varies greatly due to the different bearing types and bearing seats. Please refer to the relevant instructions.
Repair and maintenance
How to repair and maintain the automobile wheel hub bearing is an important walking part of the automobile. The wheel hub bearing is responsible for reducing the frictional resistance when the chassis is running and maintaining the normal driving of the car. If the wheel hub bearing fails, it may cause noise, bearing heating, etc., especially the front wheel is more obvious, which can easily lead to dangerous phenomena such as loss of direction. Therefore, hub bearings must be maintained on schedule. 1. Inspection of automobile wheel hub bearings (1) When checking the tightness of the wheel hub bearings, first set up the axle of the wheel at one end of the inspected wheel hub of the automobile, and set up the car safely with tools such as a support stool and a car cover. (2) Rotate the wheel under test several times by hand to see if the rotation is stable and if there is any abnormal noise. If the rotation is not stable and there is friction sound, it means that the braking part is not normal; if there is no noise, the rotation is not stable and sometimes loose, it means that the bearing part is not normal. The hub should be disassembled and inspected when the above abnormal phenomenon occurs. For small cars, when checking the wheel bearings, hold the upper and lower sides of the tire with both hands, pull the tire back and forth with both hands, and repeat it many times. If it is normal, there should be no feeling of looseness and blockage; if there is obvious feeling of looseness when swinging, the hub should be disassembled and inspected. (3) Inspection of braking. Usually when checking the wheel hub bearing, check the wheel brake device. If there are oil stains on the inside of the tire, it is likely to be caused by oil leakage in the brake cylinder or brake oil pipe. The cause should be found out in time and eliminated. 2. Maintenance of automobile wheel hub bearings Before disassembling the wheel hub, preparations for wheel hub maintenance should be made, the car should be stopped and the axle should be erected to ensure the safety of maintenance operations. (1) Remove the decorative cover and dust cover of the hub shaft head; (2) Remove the tire nut and tire, and be careful not to damage the thread of the tire bolt. If it is a disc brake, the brake should be removed and then used to remove the lock ring or lock pin. (3) Remove the hub with special tools; (4) Scrape off the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with cleaning agent and dry with a cloth, and finally wipe the hub cavity with a cloth. (5) Check the hub bearing and bearing race, and find that there are cracks, fatigue peeling and loose bearing rollers, and the bearing should be replaced. If you find pitting on the bearing race, you should also replace the bearing. (6) Check the fit between the inner diameter of the bearing and the journal. When measuring the journal with a clearance of no more than 0.10mm, it should be measured at the upper and lower parts of the vertical ground (the largest wear part). If the fit clearance exceeds the specified use limit, the bearing should be replaced to restore the normal fit clearance. It is not allowed to make burrs and pitting on the journal to reduce the gap. (7) After all parts meet the requirements, apply grease to the inner bearing and put it into the hub. (8) When applying grease to the inner cavity of the bearing, pay attention to squeezing the grease into the bearing until the grease comes out from the other side of the bearing. Apply a thin layer of grease to the hub cavity and the shaft head cover to prevent rust. Pay attention not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking. (9) Install the hub and outer bearing back on the journal, screw on the shaft head adjusting nut by hand, and then tighten the adjusting nut with the shaft head wrench according to the specified torque. After tightening the nut, turn the hub a few turns left and right to see the bearing installation; on the other hand, turn the bearing and the seat ring correctly. At this time, the bearing tightness is appropriate, and the wheel rotates freely without feeling the axial clearance. (10) Finally, install the lock plate, fixing nut, tire, dust cover and decorative cover in turn. (11) After the wheel hub bearing is adjusted, drive for a certain mileage (about 10km), stop for inspection, and use it to wipe the temperature of the wheel hub. If the heat is generated, it is caused by the adjustment of the bearing. It should be readjusted and the bearing tightness should be properly relaxed.
Causes of abnormal damage of automobile wheel hub bearing
In the maintenance process, it is often found that some cars have a large driving noise. Check that the tires are not abnormally worn, and there is no obvious abnormal noise when rotating the wheels on the lift. This phenomenon is often caused by abnormal damage to the hub bearing. The so-called abnormal refers to the bearing damage caused by the installation. The front wheel bearing of an automobile is generally a double-row ball bearing. If you use a hammer to knock the bearing when installing the bearing, or install it by pressing the inner ring of the bearing when installing the bearing into the bearing seat, it will cause damage to the bearing raceway on one side. Noise is generated when the vehicle is running, and when the wheels are off the ground, there is no obvious noise due to the better side of the raceway. Correct installation operation is the key to the long life of the bearing.
Wheel hub bearing unit with ABS sensor
The wheel hub bearing unit with ABS sensor mainly includes a flange, a ring gear rotating body, a sealing assembly and a wheel hub. An ABS sensor is arranged on the wheel hub. The magnetic steel in the ABS sensor is sleeved on the ring gear rotating body and matched with it.; The ring gear rotating body is fixedly connected with the flange. The ABS sensor mainly includes a housing, a magnetic steel and a coil. The magnetic steel is sleeved on the ring gear rotating body, and the magnetic steel is matched with the ring gear rotating body; the coil is connected to the plug through a signal line. The rotating body of the ring gear is splined with the flange. The end face of the flange is provided with holes matched with bolts, which can be directly connected with suspension, braking devices and tires. The inner hole of the flange is provided with a spline groove, which can be used in conjunction with a constant velocity drive shaft. The beneficial effect of the utility model is that the structure replaces the original combination of automobile steering knuckle, wheel hub, and bearing. It not only integrates the functions of the three into one, but also greatly reduces the volume and weight of the original structure. Greatly improve reliability.
The automobile clutch release bearing (Automobile clutch release bearing) is a key component of the automobile transmission system. It is installed between the clutch and the transmission. By coordinating the rotation and axial movement of the release lever, it realizes the smooth engagement and separation of the clutch, reduces wear and Extend the service life of the transmission system. Its structure is loosely sleeved on the bearing cover of the first shaft of the transmission, and the gap with the end of the separation lever is maintained by the return spring to ensure the working stability [1].
The bearing needs to meet the technical standards of axial clearance ≤ 0.60mm and inner race wear ≤ 0.30mm. The fault often manifests as abnormal noise or jamming, which is mainly caused by insufficient lubrication, frequent half-clutch operation or improper free stroke adjustment. Maintenance requires regular use of lithium-based grease lubrication, adjust the flatness of the separation lever and control the free stroke in the range of 30-40mm [1]. Relevant specifications can refer to JB/T5312-2001 Automobile Clutch Release Bearings and Their Units.
Chinese name
Automobile clutch release bearing
Foreign Name
Automobile clutch release bearing
Short for release bearing nature auto parts
Function: The clutch release bearing is installed between the clutch and the transmission. The release bearing seat is loosly sleeved on the tubular extension of the first shaft bearing cover of the transmission. The shoulder of the release bearing is always against the release fork through the return spring and retreated to At the final position, keep a gap of about 3~4mm with the end of the separation lever (separation finger).
clutch release bearing

Because the clutch pressure plate, the release lever and the engine crankshaft operate synchronously, and the release fork can only move axially along the clutch output shaft, it is obviously not possible to directly use the release fork to dial the release lever. The release bearing can make the release lever rotate while moving axially along the clutch output shaft, thus ensuring smooth engagement of the clutch, soft separation, reducing wear and extending the service life of the clutch and the entire drive train.