There are two types of crossed roller bearings, one is crossed cylindrical roller bearings, the other is crossed tapered roller bearings; crossed roller bearings have a long history of application outside, but only in recent years. Into the public’s vision, it is widely used due to its own uniqueness and incomparable advantages over other bearings. Many users will have some problems with the installation of crossed roller bearings, such as lubrication, installation, cleaning, etc. Today, I will explain to you, I hope it will be helpful to you.
Preparation before installation
1. Choose grease
Lubrication has an important influence on the operation and life of crossed roller bearings. Here is a brief introduction to the general principles of selecting grease. Grease is made of base oil, thickener and additives. Different types of greases with the same type and different grades have very different performances and different allowable rotation limits. Be careful when selecting them. The performance of lubricating grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature and high speed, and the high viscosity base oil is suitable for high temperature and high load.
The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. In principle, different greases cannot be mixed, and even greases with the same thickener will have adverse effects on each other due to different additives.
2. Cleaning before bearing installation
The bearing surface is coated with anti-rust oil, you must carefully clean it with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature lubricating grease before installation and use. The impact of cleanliness on rolling bearing life and vibration noise is very large. But we don’t want to remind you that closed bearings do not need to be cleaned and refueled.
Bearing installation
1. Thoroughly clean the main shaft, bearing seat or other installation parts, remove oil or impurities, and confirm whether there are burrs or burrs.
2. Install the crossed roller bearing into the shaft or bearing seat: Because it is a thin-walled bearing, it is easy to tilt when it is installed. In order to prevent this phenomenon, please use a plastic hammer to strike evenly while keeping it level, and carefully install the crossed roller bearing into the bearing housing or on the shaft until it is confirmed by sound that the reference surface is not completely close. Do not directly hammer the crossed roller bearing surface and the non-stressed surface. Use pressure blocks, sleeves or other installation tools (tools) to make the bearing evenly stressed, and do not install it through the transmission force of rolling elements.
If the mounting surface is lubricated, the installation will be smoother. If the interference is large, the bearing should be heated to 80~90℃ in mineral oil and installed as soon as possible, and the oil temperature should be strictly controlled not to exceed 100℃ to prevent the reduction of hardness due to tempering and the influence of dimensional recovery. When it is difficult to disassemble, it is recommended that you use the disassembly tool to pull out and pour hot oil on the inner ring carefully. The heat will expand the inner ring of the rolling bearing, making it easier to fall off.
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