Introduction of Thin Wall Bearing

1、 Introduction to Thin Wall Bearing
In order to obtain low friction torque, high rigidity and good rotation accuracy of the bearing, steel ball with small outer diameter is used. The use of hollow shafts ensures lightweight and wiring space. Thin-walled bearing realizes extremely thin bearing section, and also realizes miniaturization and lightweight of products. The variety of products has expanded its scope of use.
The thin-walled 6700 and 6800 series have various types of dust caps, flanges, stainless steel, wide width, etc.
2、 Classification of thin-walled bearings
CRA series thin-walled cross roller bearing (outer ring split type) is a small and lightweight cross roller bearing that thins the wall thickness of the outer ring and the inner ring. Although it is small, it can also bear heavy loads, so it can lighten the position where the bearing is installed on the device
The size of the inner and outer rings of the CRB series thin-walled cross roller bearings (outer ring split type) has greatly realized miniaturization. Its structure is that the outer ring is divided into two parts and the inner ring is an integral structure, so it is suitable for places requiring the rotation accuracy of the inner ring
The inner ring of CRE series thin-walled cross roller bearings (inner ring split type) is divided into two parts, and the outer ring is an integral structure, so it is suitable for places with high requirements for the rotation accuracy of the outer ring.
Thin-walled ring bearing has high precision, very quiet and strong bearing capacity. These ball bearings have three designs, which are very small and have a square cross-section. In these series, even the larger shaft diameter and bearing hole, the cross section will not change. Therefore, these bearings are called constant section. This feature is of standard ISO series
3、 Purpose of thin wall bearing lubrication
The lubrication purpose of thin wall bearing is to reduce the friction and wear inside the bearing and prevent sintering. Its lubrication effect is as follows:
Reduce friction and wear
In the mutual contact part of the track ring, rolling body and retainer that constitute the bearing, metal contact is prevented and friction and wear are reduced. If the rolling contact surface is well lubricated during rotation, the rolling fatigue life that extends the fatigue life will become longer. On the contrary, if the viscosity of the oil is low, the thickness of the lubricating oil film will become shorter.
Discharge and cooling of friction heat
In the cyclic refueling method, the heat generated by friction and the heat transferred from the outside can be discharged and cooled by oil. Prevent the bearing from overheating and the lubricating oil from aging.
other
It also has the effect of preventing foreign matters from entering the bearing and preventing rust and corrosion.
4、 Lubrication method of bearing
The lubrication methods of bearings include grease lubrication and oil lubrication. In order to make the bearing work smoothly, first of all, select the lubrication method suitable for the use conditions and purpose. If only lubrication is considered, the lubricity of oil lubrication will prevail. However, grease lubrication can simplify the surrounding structure of the bearing, and compare the advantages and disadvantages of grease lubrication and oil lubrication. 5、 Maintenance method of thin wall bearing
1. First take off the wheel and tighten the screw. If it falls off, it will be troublesome.
2. Remove the bearing. The core of some wheels is too tight and it is difficult to remove the bearings. Dig hard with a hexagon wrench (the screw driver). don't worry. The bearing is hard to break.
3. First, brush off the dirt on the surface of pelin with a toothbrush. You don't have to do this step. Not bad.
4. Some side covers of bearings can be removed, and some cannot. Please judge whether Mr. Peilin can take it down first. How do you judge? take it easy! If the side cover edge of the bearing has a C-ring, it can be removed. If not, it cannot be disassembled, but there are exceptions.
5. If it can be disassembled, it is very simple. Use a slotted screwdriver to pry up the C-ring at the notch of the C-ring, then remove the side cover, and then remove one side. The C-ring and side cover are all put away, and I want to put them back after washing them!
6. It's too troublesome if it can't be disassembled! Use destructive methods. Insert a precision screwdriver into the gap of the side cover and pry up the side cover. Please don't doubt. yes. But this side cover cannot be installed. Well, throw it away! Please remember. Just take off one side. If the two sides are removed, they will break.
7. Remove the side covers on all bearing sides and start washing! Please put the dirty oil into a bowl, remove the bearing and stir it.
6、 Maintenance of thin-walled bearings
Install and remove bearing carefully
Different types and sizes of thin-walled deep groove ball bearings have different installation methods and tools, including mechanical or hydraulic. This section mainly introduces general basic installation methods and precautions.
1. Do not install on the ball with force. The ball and contact surface are partially overloaded, and the bearing will fail early.
2. Do not use hard tools such as hammers and screwdrivers to hit the bearing surface, otherwise the outer ring of the bearing will be broken or brittle.
3. Bearing cleaning
It is very important for bearings to use clean environment. The surface roughness accuracy of the ring rotating surface and the rolling body of the deep groove ball bearing is about 1/10 m. Once the surface of such a smooth ball is dirty, its impact will be serious. The lubricating layer between the rolling surfaces is usually 0.2~1 m, and the particle impurities larger than the lubricant particle size are over-rolled by the rolling body, which will produce local pressure on the self-aligning roller bearing steel. At this point, the size of dust particles in the external environment can reach 10 m, which will also damage the self-aligning roller bearing. Because of this, clean working environment is very important for bearings.
4. Process inspection of thin-walled bearing
When the operating temperature of the induction bearing acting due to overheating in use exceeds the specified limit temperature, it will automatically send an alarm to prevent the occurrence of the combustion shaft condition. It is a good indication that the bearing has been in abnormal condition under high temperature. High temperature is also harmful to the lubricant of bearing. Overheating of thin-walled deep groove ball bearings can sometimes be attributed to the lubricant of bearings. If the bearing moves continuously for a long time at a temperature of more than 125, the bearing life will be reduced. The cause of high temperature bearing may be insufficient lubrication of bearing, unqualified lubricant, impurities contained in it, friction caused by insufficient oil seal clearance in the bearing when the load is too large, etc. 7、 Bearing sealing device
The two ends of the bearing are installed with their own sealing devices, but many people do not know what role the sealing device plays. Let's see how the sealing device acts on the thin-walled bearing.
1. Keep the lubricating grease (oil) inside the bearing from losing during use, and ensure that the bearing is in a lubricating state;
2. In order not to damage the bearing, protect the dust and harmful gas outside the bearing from entering the bearing cavity.