Motor assembly and disassembly steps and methods

      Before disassembly, the site should be cleaned, tools should be prepared, and the joints, end caps and casings, bearing caps and end caps should be marked to avoid mistakes during assembly. The general steps for removing the motor are as follows:

      1. Remove the belt or disconnect the coupling pin of the coupling;

      2. Remove the power wiring and grounding wire in the junction box;

      3. Remove the pulley or coupling;

      4. Remove the foot nut and washer;

      5. Remove the front bearing cover;

      6. Remove the front end cover;

      7. Remove the fan blade cover;

      8. Remove the blades;

      9. Remove the rear bearing cover;

      10. Remove the rear end cover;

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Method of disassembling a bearing cap of an electric motor

       1. The bearing cover is very easy to remove. Just remove the screws that fix the bearing cover and remove the front and rear bearing covers. The front and rear bearing covers should be marked with a mark to avoid mis-assembly before and after assembly.

       2. The assembly method of the bearing cover is: insert the outer cover through the rotating shaft outside the end cover, insert a screw, hold the screw with one hand, turn the shaft with one hand, and then turn the bearing inner cover to the outer cover. When the screw holes are aligned, the screws can be inserted into the screw holes of the inner cover and tightened. Finally, the other two screws are also tightened.

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Causes of damage to the clutch release bearing

      Causes of damage to the clutch release bearing
1. Working conditions and stress of clutch release bearing
The separation bearing is subjected to axial load, impact load, and radial centrifugal force during high-speed rotation during use. Further, since the fork thrust and the reaction force of the separation lever are not in the same straight line, a torsional moment is also formed. Clutch release bearings have poor operating conditions, intermittent high-speed rotation and high-speed friction, high temperature, poor lubrication conditions, and no cooling conditions.
2. Reasons for damage to the clutch release bearing
The damage of the clutch release bearing has a lot to do with the driver's operation, maintenance and adjustment. The causes of the damage are as follows:
1) The operating temperature is too high to cause overheating
Many drivers often turn the clutch halfway when turning or decelerating, and some of the gears are placed on the clutch pedal. Some vehicles have too large free travel adjustment, which makes the clutch separation incomplete, in a semi-engaged and semi-detached state. The dry friction causes a large amount of heat transfer to the separation bearing. The bearing is heated to a certain temperature, and the butter melts or dilutes the flow, so that the temperature of the separation bearing is further increased, and when the temperature reaches a certain level, it burns out.
2) wear and tear without lubrication
The clutch release bearing is lubricated with butter. There are two ways to add the butter. For the 360111 release bearing, the rear cover of the bearing should be opened to fill the grease during maintenance or when the transmission is removed, and then the rear cover should be reinstalled. For the 788611K release bearing, it can be removed and placed in molten grease for digesting, and then taken out after cooling to achieve the purpose of lubrication. In actual work, the driver easily overlooks this, resulting in a lack of oil in the clutch release bearing. The amount of wear of the separated bearing in the case of no lubrication or less lubrication is often several to several tens of times the amount of wear after lubrication. As the wear increases, the temperature will also increase greatly, which makes it more vulnerable.
3) Free travel is too small or too many loads
According to the requirements, the clearance between the general clutch release bearing and the separating lever is 2.5mm, which is reflected in the free travel of the clutch pedal is 30-40mm, the free travel is too small or there is no free travel at all, which will make the separation lever and The release bearing is in a normally engaged state. According to the principle of fatigue failure, the longer the bearing working time, the more serious the damage; the more the number of loads, the more likely the separation bearing is to cause fatigue damage. Moreover, the longer the working time, the higher the temperature of the bearing, and the easier it is to burn, reducing the service life of the separation bearing.
4) In addition to the above three reasons, whether the separation lever is adjusted flat, whether the separation bearing return spring is good or not, has a great influence on the damage of the separation bearing.

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Daily judgment of rolling hardware bearings

It is understood that knowing it can be used, to understand the functionality of hardware tools, in order to use it. Bearings, you can look at its finish (or roughness) first, the quality is good, you don't have to talk about it. Looking further, you can hold the bearing in your hand and turn it hard to see if it rotates very smoothly and naturally, without noise.

    The general 6xXXX series bearings used by nsk are really easy to use, that is, the price is more than double that of domestic ones. But its life is high, compared to most domestic bearings, one can be used for the top two. So the price is still cost-effective.

    There aren't many shops selling professional bearings. You can go to the hardware store to buy them. (There are some places where you can sell auto parts, motorcycle parts, and belts.) You don't have to go to a small shop. Generally, fixed stores with such bearings will make a very eye-catching brand. When you buy, you ask them to invoice, generally do not give fakes.

    I have used Harbin in domestic bearings, and it is more affordable to buy. The quality is also good. But after a long time, the noise is a little loud and needs lubrication, otherwise it should be rusted.

    Singapore's bearings are of quality between nsk and domestic.

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Causes of corrosion of bearing products

The main causes of corrosion are as follows:

    1. In the process of producing bearings, some enterprises did not strictly carry out anti-rust treatment on the bearing parts in the processing process and the finished bearing products in accordance with the requirements of cleaning anti-rust regulations and oil seal anti-rust packaging. If the ferrule has a long turnaround time during the turnaround, the outer ring of the outer ring is exposed to corrosive liquid or gas.

    2. The quality of anti-rust lubricating oil and cleaning kerosene used by some enterprises in production cannot meet the requirements of process technology.

    3. As the price of bearing steel drops and then falls, the bearing steel material gradually declines. For example, the content of non-metallic impurities in the steel is too high (the increase in sulfur content in the steel causes the corrosion resistance of the material itself to decrease), the metallographic structure deviation, and the like. The source of bearing steel used in production companies is more complicated, and the quality of steel is even more.

    4. Some enterprises have poor environmental conditions, high levels of harmful substances in the air, and too little turnover space, making it difficult to carry out effective anti-rust treatment. Coupled with the hot weather, production workers violated anti-rust procedures and other phenomena.

    5, some enterprises' anti-rust paper, nylon paper (bag) and plastic cylinder and other bearing packaging materials do not meet the requirements of rolling bearing oil seal anti-rust packaging is also one of the factors causing corrosion.

    6. The turning allowance and grinding allowance of the bearing ring of some enterprises are small, and the oxide scale and decarburization layer on the outer circle are not completely removed.

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What are the methods for removing common rolling bearings?

Commonly used disassembly methods for rolling bearings are: tapping method, pull-out method, pushing method, and hot-breaking method.

First, the tapping method

The tapping force is generally applied to the inner ring of the bearing. The striking 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 at the end of the shaft, it is smaller than the inner diameter of the bearing. A copper rod or other soft metal material is placed against the shaft end, and a pad is placed at the lower part of the bearing, and the hammer is gently tapped with a hammer to remove it. Applying this method should pay attention to the position of the pad to be placed properly, and the focus should be correct.

Second, the pull out method

A special puller is used. When disassembling, the bearing will be pulled out slowly as long as the handle is rotated. When the outer ring of the bearing is disassembled, the angle of the two legs of the puller should be opened outwards; when the inner ring of the bearing is removed, the two legs of the puller should be inward and snapped onto the end face of the inner ring of the bearing.

  Precautions:

1. The pull hook of the puller should be hooked on the inner ring of the bearing, and should not be hooked on the outer ring to avoid excessive looseness or damage of the bearing;

2. When using the puller, align the screw to the center hole of the shaft and do not skew. Should also pay attention to the force of the hook and the bearing, do not damage the hook and bearing;

3. Pay attention to prevent the hook from slipping off;

4. The angle of the two legs of the puller is less than 90°.

Third, push method

The bearing is pressed by the press, and the work is stable and reliable without damaging the machine and the bearing. The press has manual pushing, and the mechanical or hydraulic press pushes.

Note: The pressing point of the press should be on the center of the shaft and should not be biased.

Fourth, hot demolition

Used to remove the tight fit bearing. First, the oil heated to about 100 °C is poured into the bearing to be dismantled. After the bearing ring is thermally expanded, the bearing can be pulled out with a puller.

  Precautions:

1. First, the puller should be installed on the bearing to be removed and a certain pulling force should be applied;

2. Before heating, the shaft should be wrapped with asbestos rope or thin iron plate to prevent the shaft from being swollen by heat. Otherwise, it will be difficult to disassemble. When the bearing is removed from the bearing housing hole, only the bearing housing hole can be heated and cannot be heated. Bearing

3. When pouring oil, the oil pot should be smoothly poured on the bearing ring or the rolling element, and an oil basin should be placed under it to collect the hot oil flowing down to avoid waste and burns;

4. Operators should wear asbestos gloves to prevent burns.

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Causes, phenomena and treatment methods of bearing temperature rise

1. Reasons for the increase in bearing temperature:

    (1). Bearing cooling water is interrupted.

    (2). The oil quality is degraded, the oil itself is not clean or the oil is degraded during operation. If the water in the oil increases, the acidity of the oil will increase, the lubricating effect of the oil will be reduced, the bearing bush will be corroded, and the bearing temperature will rise.

    2. Phenomenon:

    (1). There is an alarm bell ringing.

    (2). The machine side water wheel mechanical fault light plate is on, the temperature of the instrument indicating the bearing temperature rises, and the signal relay operates.

    (3). Thermometer disk (inflated thermometer) The black needle and the yellow needle overlap or exceed the yellow needle.

    (4). A fault signal that raises the bearing temperature.

    3. Processing

    When the bearing temperature rises, first judge whether it is malfunctioning. If it does rise, it should be treated as follows:

    (1). Check the cooling water pressure, water flow and piping system is normal. If the water pressure is low, the filter may be clogged and cannot be disposed of in time. It can be shut down and put into use when it is confirmed that it can work.

    (2). Check the oil pressure of the governor. If the oil pressure is low, the cooling water hydraulic valve may be closed.

    (3). Check if the bearing has abnormal sound and check if the bearing swing is abnormal.

    (4). Observe the oil sample to see if there is any change in the oil color, and test it to see if it has deteriorated. If deterioration is confirmed, stop replacing the new oil.

    (5). Check if the oil level is normal. If it is not normal, check if the oil drain valve is closed. If it is closed, it should be replenished. If the gasket is oily, it should be stopped.

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