Wheel KOYO bearing installation, use common sense

The largest number of wheel bearings for cars used in the past was the use of single row tapered roller or ball bearings in pairs. With the development of technology, car hub units have been widely used in cars. The range and use of hub bearing units is increasing, and has now reached the third generation: the first generation consists of double row angular contact bearings. The second generation has a flange for fixing the KOYO bearing on the outer raceway. The KOYO bearing can be simply placed on the axle and fixed with a nut. Make the maintenance of the car easier. The third-generation wheel bearing unit is equipped with KOYO bearing unit and anti-hold brake system. 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 KOYO bearing together.

Worn or damaged wheels KOYO bearings or hub units can cause unsuitable and costly failures in your vehicle's journey, even causing damage to your safety. Please pay attention to the following items during the use and installation of the hub bearing:

1. In order to ensure maximum safety and reliability, it is recommended that you always check the wheel KOYO bearing regardless of the length of the car - pay attention to whether the KOYO bearing has early warning signs of wear: including any friction noise or suspension combination wheel Unnormal deceleration during cornering.

For rear-wheel-drive vehicles, it is recommended to lubricate the front wheel hub KOYO bearing when the vehicle travels to 38,000 km. When replacing the brake system, check the KOYO bearing and replace the oil seal.

2. If you hear the noise from the bearing parts of the hub, first of all, it is important to find the location where the noise occurs. There are many moving parts that may produce noise, or some rotating parts may come into contact with the non-rotating parts. If it is confirmed that the noise is in the KOYO bearing, the KOYO bearing may be damaged and needs to be replaced.

3. Because the working conditions of the front wheel hub causing the failure of KOYO bearings on both sides are similar, it is recommended to replace them in pairs even if only one KOYO bearing is broken.

4, the wheel bearing is more sensitive, in any case need to use the correct method and the right tool. KOYO bearing components must not be damaged during storage and installation. Some KOYO bearings require a large pressure to press in, so special tools are required. Be sure to refer to the car manufacturer's instructions.

5, when installing KOYO bearings should be in a clean and tidy environment, the entry of fine particles into KOYO bearings will also shorten the service life of KOYO bearings. It is very important to maintain a clean environment when replacing KOYO bearings. It is not allowed to hit the KOYO bearing with a hoe. Note that the KOYO bearing should not fall to the ground (or similarly handled improperly). The condition of the shaft and the housing should also be checked before installation. Even slight wear can cause poor fitting and cause early failure of the KOYO bearing.

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Method for reducing NSK bearing noise and maintenance and maintenance

(1) Using a vibration absorbing or vibration isolating device

The simplest example is a radial ball NSK bearing that can withstand thrust at high speed instead of a thrust NSK bearing. It can be fitted with a plastic jacket filled with anti-rust lubricant on its outer ring, a thrust NSK bearing with a casing or a general thrust NSK. The bearing, if permitted, is fitted with the same plastic sleeve in its inner or outer circumference, but the control must not rub or interfere with adjacent parts during rotation. This method has a certain muffling effect.

The use of vibration absorption or vibration isolation devices to reduce NSK bearing noise or isolate NSK bearing noise can achieve good results, but this often costs a lot of money, sometimes the mechanism becomes larger, the heat dissipation conditions become worse, or it is easy to rust. To be fully considered, this law will only be used after the other measures have not been adopted to achieve low noise indicators.

An example is the use of a sound-absorbing sound enclosure to completely enclose or substantially block the noise-generating NSK bearing system. The inside of the noise reduction cover is made of glass fiber or polyurethane foam, and the inner surface is a steel plate with a thickness of 0.6-lmm. The surface is uniformly distributed with small through holes of φ1.2-1.5mm, and the total area of ​​the small holes accounts for the entire inner surface. 25% to 30% of the surface, and the outer surface is a steel plate having a thickness of 2 mm.

Another example is to add an intermediate sleeve between the NSK bearing and the seat hole to attenuate the vibration force transmitted by the rotating system to the NSK bearing seat, but this requires proper deployment, otherwise the opposite effect may occur.

Here glass fiber or foam is used to eliminate higher frequency noise, the inner surface with small holes is used to eliminate lower frequency noise, and the thick steel plate on the outer surface is used to isolate the noise from the outside.

(2) Method of changing the rotational speed of the corresponding part of the host

In order to reduce the noise of the oil pump system, the oil pump that was originally used at a motor speed of 1430r/min at a flow rate of 10L/min was changed to a motor with a speed of 710r/min and equipped with a larger pump to obtain the same flow rate. The noise of the NSK bearing of the oil pump NSK bearing and the oil pump motor is significantly reduced, but the space occupied by the whole set of institutions has been expanded and the cost has also increased.

The noise of rolling NSK bearings is not very sensitive to the load, but it is sensitive to the speed. When conditions permit, the method of reducing the speed and increasing the torque achieves the same purpose, but reduces the noise.

(3) Method of using chemical additives

Adding some chemical additives to NSK bearing lubricants can reduce NSK bearing noise. For example, a factory in Tianjin produces a low-noise grease containing noise-reducing additives, which can reduce NSK bearing noise from the original 3.9~ 9.2dB, suitable for use in miniature or small NSK bearings.

How should NSK bearings be maintained and maintained?

In order to fully utilize NSK bearings and maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed. Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.

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