How do I disassemble the bearing? How do I remove the rear wheel bearing?

The disassembly of the bearings is carried out with the same care as when mounted. Pay attention not to damage the bearing and various parts, especially the disassembly of interference fit bearing, which is difficult to operate. Therefore, it is important to consider the ease of disassembly in advance in the design stage, and it is also very important to design and make disassembly tools according to needs.

When dismantling, study the disassembly method and sequence according to the drawings, and investigate the matching conditions of the bearing, so as to obtain the foolproof disassembly operation.

1. Disassembly of the outer ring Disassemble the outer ring of interference fit, set several screws for the outer ring extrusion screw on the circumference of the shell in advance, tighten the screw evenly on one side, and disassemble it on the other side. These screw holes are usually covered with blind plugs, separating bearings such as tapered roller bearings, etc., with several cuts in the abutments of the housing, using cushions, disassembling with a press, or gently tapping.

2. The disassembly of the cylindrical bore bearing The disassembly of the inner ring can be pulled out by pressure machinery. At this time, care should be taken to allow the inner ring to withstand its pulling force. The inner ring of large bearings is disassembled using the hydraulic method.

The oil pressure is applied through the oil hole arranged on the shaft to make it easy to draw. For bearings with large widths, the hydraulic method is used in conjunction with the drawing fixture to disassemble the bearing. The inner ring of NU and NJ cylindrical roller bearings can be removed by induction heating.

This is a method of heating the part in a short period of time to expand the inner ring and then pulling it out.

3. Disassembly of taper bore bearings Disassemble relatively small bearings with adapter sleeves, support the inner ring with a block fastened on the shaft, turn the nut back several times, and use the cushion block to beat the hammer to disassemble.

4. For large bearings, it is easier to disassemble by hydraulic pressure, and the method of pressurizing oil supply in the oil hole on the taper shaft to expand the inner ring and disassemble the bearing. During operation, there is a possibility that the bearing will suddenly come out of it, and it is best to use the nut as a stopper.

A good way to disassemble the bearing, easy to operate.

Tools Ingredients: Flywheel cover tools, flywheel fixing wrenches, large adjustable wrenches, grease or anti-caking agents. Here's how:

1. Use a fly wrench to remove the rear wheel from the rear frame of the bicycle, remove the quick release lever, and pay attention to the small springs on both sides.

2. Take out the cassette flywheel cover tool dedicated to disassembly, which cannot be replaced by a wrench, as shown in the figure below.

3. Attach the flywheel cover tool to the flywheel cover so that the spline and groove are aligned.

4. Install the flywheel fixing tool so that it completely engages with the flywheel piece, and the function is to prevent the flywheel tower base from rotating.

5. Place the flywheel facing up, and use a large wrench to start unscrewing the flywheel cover tool counterclockwise.

6. Tighten the flywheel cover clockwise, and pay attention to the minimum flywheel blade not to be misplaced.

7. Carefully check whether the spacing of the flywheels is even, and then use a wrench to completely tighten the flywheel cover.

8. Use a movable wrench to tighten the flywheel cover clockwise until it cannot be screwed, and the disassembly and assembly of the rear wheel bearing of the bicycle is completed.

Note: The rear wheel of the bicycle has rolling bearings. Bicycles usually have a bead structure on the rear wheel, or they use industrial bearings directly. Both have the same principle and both belong to rolling ball bearings.

It's just that there are all the differences in the process of pretending to be old. In addition, some high-end wheels are equipped with needle roller bearings in the rear wheel tower. Needle roller bearings also belong to rolling bearings, but the object that rolls inside the former bearing is global, while the object that rolls inside the needle roller bearing is cylindrical.

A good way to disassemble the bearing, easy to operate.

Answer: When removing smaller bearings, remove them from the shaft by gently tapping the side of the bearing ring with a suitable punch, or better yet, using a mechanical puller. The grip should be applied to the inner ring or adjacent parts. The removal process can be simplified if the shoulder and housing bore shoulder are reserved for grooves to accommodate the puller grip.

In addition, some threaded holes are machined at the position of the hole shoulder to facilitate the bolt to eject the bearing.

Medium to large bearings typically require more force than a machine tool can provide. Therefore, hydraulic power tools can be used, the oil injection method, or both. This means that oil holes and oil grooves need to be designed on the shaft.

There are percussion method, pull out method, push method, hot dismantling method, induction heating method, etc., the so-called induction heating, also called electric frequency induction heating, through the magnetic coil conduction to generate heat, so that the bearing expands, so as to remove the bearing.

The following points should be paid attention to when disassembling the bearing:

1. Improve lubrication quality, control the pressure, temperature and flow of oil, and strengthen oil filtration.

2. Use fuel and lubricating oil that meet the regulations.

3. Control the temperature state of the diesel generator set, and it is unfavorable to work in the case of overcooling and overheating. In cold weather, the diesel engine should be preheated before starting, and the crankshaft should be rotated by hand to make the oil enter the friction surface.

4. The surface quality and geometry of bearings and journals should be strictly guaranteed.

5. The bearing clearance should be appropriate, the generator set is too large to produce impact, too small will have poor lubrication, and the tile may be burned.

1. Percussion method.

The percussion force is generally added to the inner ring of the bearing, and the percussion force should not be added to the rolling element and the cage of the bearing, this method is simple and easy, but it is easy to damage the bearing, when the bearing is located at the end of the shaft, the copper rod or its soft metal material that is smaller than the inner diameter of the bearing is against the shaft end, and the lower part of the bearing is added with a cushion block, and it can be removed by gently striking with a hand hammer. When applying this method, attention should be paid to the appropriate position of the cushion block and the correct focus point.

Second, pull out the method.

With a special puller, the bearing is slowly pulled out when disassembled, simply by rotating the handle. When disassembling the outer ring of the bearing, the bending angle of the two feet of the tensioner should be opened outward; When disassembling the inner ring of the bearing, the two feet of the tensioner should be inward and stuck on the end face of the inner ring of the bearing.

Precautions: 1. The retractor of the pulling tool should be hooked to the inner ring of the bearing, but not to the outer ring, so as to avoid excessive loosening or damage to the bearing;

2. When using the pulling tool, the screw rod should be aligned with the center hole of the shaft and should not be skewed. Attention should also be paid to the stress of the hook and the bearing, and the hook and bearing should not be damaged;

3. Pay attention to prevent the retractor from slipping;

4. The bending angle of the two feet of the pulling tool is less than 90°.

3. Pushing method.

The bearing is pushed by the press, which works smoothly and reliably, and does not damage the machine and the bearing shield room. Presses are available in manual pushing, mechanical or hydraulic presses.

Precautions: The focus point of the press should be on the center of the shaft, and the pressure deviation should not be allowed.

Fourth, the hot dismantling method.

It is used to disassemble bearings with a tight fit. First, the oil heated to about 100 is poured on the bearing to be disassembled with an oil can, and after the bearing ring is heated and expanded, the bearing can be pulled out with a pulling tool.

Precautions: 1. First of all, the tension tool should be installed on the bearing to be disassembled, and a certain tension should be applied;

2. Before heating, the shaft should be wrapped with asbestos rope or thin iron plate to prevent the shaft from being heated and expanded, otherwise it will be difficult to disassemble, and when the bearing is disassembled from the bearing box hole, it can only heat the bearing box hole, not the bearing;

3. When pouring oil, the canopy room should pour the oil pot smoothly on the bearing ring or rolling element, and place an oil basin under it to collect the hot oil flowing down to avoid waste and scalding;

4. The operator should wear asbestos gloves to prevent burns.

5. Induction heating method.

The principle of electromagnetic induction is applied to generate an induced current in the inner ring of the bearing, so that it heats up and expands, so as to produce a gap at the fitting place and achieve the purpose of easy disassembly. Due to the rapid, uniform, clean and pollution-free induction heating, high heating quality, and to ensure that the bearing is not damaged, this advanced disassembly method is gradually replacing baking, boiling and other methods.

A good way to disassemble the bearing, easy to operate.