What are the instructions for oil-free bearing installation?

1. It should be determined whether there are any injuries, protrusions, etc. on the mating surfaces of the shaft core and the shaft shell. If it is necessary to remove it with oil grindstone or fine sandpaper.

2. Confirm if dust or mold sand is attached to the surface of the bearing shell.

3. In order to avoid bumps during loading, a small amount of lubricating oil should be applied to the surface of the shaft and shaft housing. To install the bearing on the shaft, apply force to the inner ring. When mounting the bearing to the bearing housing, apply force to the outer ring. When applying force on the bearing, be careful to make the force vertical and even down. If you hit the bearing, the bearing will be injured. Try to avoid partial hitting.

4, the oil-free bearing retainer and the sealing plate must not be forced. The method of installing the hammer and the bushing is a commonly used method, because the bearing will be damaged, so do not hit it directly. The sleeve should be tapped in the middle and the hammer should be tapped lightly. In the mechanical construction, when the inner and outer rings are tightly fitted, the pad should be used, so that the force can be applied to the inner and outer rings at the same time. If only the inner ring is pressed in, the force will be pressed into the outer ring by the ball, so it will cause scratches on the track surface.

5. When a bearing with a large margin is mounted on a shaft, a method of heating the bearing to 80-90 degrees in a clean oil and expanding the inner diameter is widely used. The hardness of the bearing is reduced due to overheating, so it must not exceed 100 degrees. At this time, the bearing must be suspended by wire, or placed on the wire and support plate, and should not be placed at the bottom of the groove. When the bearing reaches the desired temperature (below 100 degrees), it should be taken out of the groove immediately and quickly put into the shaft. The bearing will shrink with the temperature drop. Sometimes there will be a gap between the shoulder and the end face of the bearing. Therefore, it is necessary Use a tool to press the bearing in the axial direction.

We often read the instructions for a new product, so that we know how to use it and what to pay attention to. This oil-free bearing installation instruction is equivalent to a part of the oil-free bearing product specification, and it is also necessary for us to understand, in order to better use and protect oil-free bearings. And our neglect can damage the bearing and affect the service life of the bearing.
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Small bearings are able to withstand energy and reduce emissions.

Focus on the reduction of small parts

The reporter learned that for traditional cars, JTEKT optimizes components such as steering gear, drive system components, and automotive bearings/sealing rings through miniaturization, lightweight, torque reduction, and friction reduction. After the parts are tested to reduce the fuel consumption, the test results are proposed to the vehicle manufacturers to jointly develop a series of more fuel-efficient and environmentally friendly products. For new energy vehicles, JTEK has developed a series of products that have been widely used. Such as electric power steering (EPS), high-sealing and low-friction wheel bearings, low-torque and lightweight tapered roller bearings, and hydrogen storage device valves and pressure reducing valves developed for hydrogen fuel vehicles.

Expanding the EPS product line to meet market demand

In the development process, JTEKT has been committed to providing low-energy products. The products in the automotive parts range include automotive steering systems and bearings. The main product of the steering system is EPS. For traditional steam and diesel vehicles, as early as 1988, JTEKT successfully developed the world's first EPS and achieved mass production. “In 2013, JTEKT's global EPS market share reached 31%, about 12 million units. As of April 2015, the cumulative production of JTEE EPS exceeded 100 million units.” Yeouido told reporters that it is currently Taigete's EPS ranks first in the global market share and is the leader in the EPS market.

Compared with the traditional hydraulic power steering gear, EPS has the advantages of light weight, strong control, easy installation, low noise, etc., but more importantly, because it is equipped with a motor, it reduces the fuel consumption of the engine and is more energy efficient. The current global fuel consumption limit is step by step, and the development of new energy vehicles is booming, and EPS is welcomed by the market. Yeouido said that the global demand for EPS will continue to grow. It is estimated that about 70% of passenger cars in the world will use EPS in 2018. China's EPS loading rate is still not high, and it is expected to show a spurt growth in the next few years.

It is the broad prospects of the Chinese market. In recent years, JTEK has further expanded the EPS product line to produce column-assisted electric steering gear (C-PES) and pinion-type electric power steering (P-EPS). And EPS, such as double pinion EPS (DP-EPS), can be equipped with EPS from small cars to large SUVs. According to Yeouido, the future will develop high-performance, high-output power for various energy-saving and new-energy vehicles such as hybrid vehicles, plug-in hybrid vehicles, fuel cell vehicles, and electric vehicles. Lightweight EPS.

Optimize bearings to achieve energy saving and emission reduction

In addition to EPS, JTEKT has also been engaged in low-torque, lightweight bearing research. According to Yeouido, this kind of low-torque various types of vehicle bearings will be more in line with the Chinese market. More importantly, the use of new materials and optimization of existing designed bearings will reduce the fuel consumption of the vehicle.

Today, JTEKT has successfully optimized the tapered roller bearings for transmissions, differentials, etc., and has a long life and optimized fuel consumption. “By improving its internal structure, it minimizes torque, reduces friction, improves transmission efficiency, and saves fuel.” Yeouido said that the standard bearing weight is 421g, and it is compact and lightweight (KE) through high-density carburizing technology. The optimized tapered roller bearing has a reduced size, weight reduction of 35% and weight of 275g. Low torque technology (LFT) is used to reduce the sliding and rolling resistance. Through the KE+LFT technology combination solution, the optimized The bearings can reduce the torque by 55% and reduce the overall fuel consumption by 1.5%~2%. The optimized tapered roller bearings are made of oil-resistant materials, which extend the service life of the oil by 10 times.

It is reported that Jettage has also successfully developed a new generation of tapered roller bearings LFT-IV with low torque performance. The bearings are used inside the car transmission and the differential unit supports the pinion, such as the car differential. On the pinion, it can reduce the fuel consumption of the car by 2.5%.

In terms of wheel bearing optimization, Jettage has also achieved success. Yudao told reporters that by using CAE analysis of peripheral components, Jettage minimizes the weight of the hub bearings while maintaining strength, thereby reducing fuel consumption.
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