Hub.
Car hub bearings used to be the most used in pairs of single row tapered roller or ball bearings. With the development of technology, car wheel hub unit has been widely used. The use range and usage of wheel bearing units are growing, and they have developed into the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange for fixing the bearing on the outer raceway, which can be simply inserted onto the axle and fixed with a nut. It makes car maintenance easier. The third generation of wheel hub bearing unit is a combination of bearing unit and anti-lock 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 installs the entire bearing together.
The wheel hub is also called the rim. According to the characteristics and needs of different models, the wheel surface treatment process will also take different ways, which can be roughly divided into two kinds of paint and electroplating. Ordinary models of the wheel in the appearance of less consideration, good heat dissipation is a basic requirement, the process is basically using paint treatment, that is, first spray and then electric baking, the cost is more economical and the color is beautiful, keep a long time, even if the vehicle is scrapped, the color of the wheel is still the same. The surface treatment process of many popular models is baking paint. Some fashion-forward, dynamic colored wheels also use paint technology. This kind of wheel is moderately priced and has complete specifications. Electroplated wheels are divided into silver electroplating, water electroplating and pure electroplating. Although the color of electroplated silver and water electroplated wheel is bright and vivid, the retention time is short, so the price is relatively cheap, and it is liked by many young people who pursue freshness.
A hub includes a lot of parameters, and each parameter will affect the use of the vehicle, so before modifying and maintaining the hub, first confirm these parameters.
dimension
Hub size is actually the diameter of the hub, we can often hear people say 15 inch hub, 16 inch hub such a statement, of which 15, 16 inches refers to the size of the hub (diameter). In general, on the car, the wheel size is large, and the tire flat ratio is high, it can play a good visual tension effect, and the stability of the vehicle control will also be increased, but it is followed by additional problems such as increased fuel consumption.
breadth
The width of the wheel hub is also known as the J value, the width of the wheel directly affects the choice of tires, the same size of tires, the J value is different, the choice of tire flat ratio and width is different.
PCD and hole positions
The professional name of PCD is called the pitch circle diameter, which refers to the diameter between the fixed bolts in the center of the hub, the general hub large porous position is 5 bolts and 4 bolts, and the distance of the bolts is also different, so we can often hear the name 4X103, 5x14.3, 5x112, taking 5x14.3 as an example, On behalf of this hub PCD is 114.3mm, hole position 5 bolts. In the choice of hub, PCD is one of the most important parameters, for safety and stability considerations, it is best to choose the PCD and the original car hub to upgrade.
Rim hub repair
The method and procedure of repairing the rim hub can vary according to the degree and type of damage. Here are some common fixes:
Minor scratch repair : For minor scratches, sand with fine sandpaper until smooth, then fill with putty, and finish with spray paint. This method is suitable for surface scratches and can effectively restore the beauty of the wheel hub.
Serious scratch repair : For deeper scratches, sand with fine sandpaper until smooth, then fill in with putty, apply several times and let dry. Finally, spray painting is carried out to ensure that the spray paint is uniform and the beauty of the wheel hub can be restored.
deformation repair : Minor deformations can be restored to level by filling in the dented area with a sponge or cloth and then tapping it with a hammer. For serious deformation, it may need to be repaired by a professional shaping machine, and may even need to be replaced with a new wheel hub.
fracture repair : If the hub is broken, it is difficult to repair and may need to be welded or replaced with a new hub. Welding repair may affect the safety performance of the hub, so it is recommended to replace the hub directly.
corrosion repair : For corroded wheels, first remove the corroded part, and then sand and spray paint treatment. If the corrosion is severe, a new hub may need to be replaced.
In addition to repair methods, daily maintenance is also very important. Regular cleaning and inspection of the hub to avoid scratching and impact can effectively extend the service life of the hub.
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