Timken bearing sealing technology

    When choosing the right seal design for a timken bearing application, the type of lubricant, operating environment, application speed and overall operating conditions must be considered.
    Shaft surface roughness
    It is important to ensure that the machining of the shaft surface does not produce spiral flutes, as the spiral flutes can cause the lubricant to squeeze out or cause contaminants to enter the timken bearing gap. Forming grinding usually achieves satisfactory surface roughness requirements.
    2. Grease lubrication - exhaust
    When grease lubrication and friction or non-friction sealing instruments are used, an exhaust port should be provided in the bore between the two bearings. This prevents contaminants from entering the bearing through the seal when there is a pressure differential between the timken bearing cavity and the atmosphere.
    3. Vertical shaft seal - oil lubrication
     Lubricating timken bearings for vertical shafts is a difficult problem. For reasons of simplicity, grease, oil mist or oil-air is usually used for lubrication. However, some high-speed or heavy-duty applications use circulating oil lubrication. It is required to have a good sealing system and a suction pump, the purpose of which is to extract the lubricating oil from the bottom bearing part.

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How to choose the servo motor housing correctly

    Parallel slitted housings are usually made of a single piece of metal. Aluminum is often used, and spiral slitting is used to accommodate deflection and torque transfer. They usually have good functionality and have a price advantage, and in many practical applications, it is the product of choice. The single piece of original data is designed to complete the torque transfer without backlash and the maintenance-free advantages. There are two fundamental series here: single-slit and multi-slit.
    The single-slot type has a long multi-ring long slit, which gives the bearing housing a good elasticity and a small bearing load. It can accept all kinds of deflections, and is most suitable for handling angular displacement and axial displacement, but the parallel bias has a weaker receiving force. Because the single slit is bent together in two different directions, a large external pressure will occur. This incurs premature damage to the parts. Although the long single-sleeve housing can be easily bent under the biased condition, the rigidity of the bearing housing has the same effect under the torsional load. Excessive turning clearance under torsional loads can affect the accuracy of the housing and weaken its overall function. Single-slot housings are an economical choice and are best suited for low torque applications, especially in articulated encoders and other lighter instruments.
   Multi-slit housings typically have 2-3 slits to create a low torque rigid Issue. The multi-slit type allows the slit to be shortened without impairing the biasing ability. The short slit increases and overlaps the torque rigidity of the bearing housing to allow it to accept a very large torque. This function makes it suitable for light load applications, such as the connection of servo motors and lead screws. This function does not have any negative effects: as the size of the slit increases beyond the single-slot type, the bearing load will increase, but in a few cases, the bearing can be sufficiently useful to maintain. A few manufacturers have extended the concept of multi-cutting to another level. In addition to a set of multiple slits, two sets of multiple slits are also used together. Multiple sets of multiple slits make the housing more flexible and biased. The increase in size means the ability to accept parallel deflection. Compared to single slits and single-sleeve multi-slit housings, multiple sets of multi-slit housings can be bent together in different directions in parallel deflections. Comply with this bias. Today, a large number of this series of housings are made of aluminum, but there are also a few manufacturers that supply stainless steel for design. In addition to corrosion resistance, stainless steel housings also increase torque acceptance and stiffness, sometimes reaching twice the equivalent of aluminum. But this increased torque and stiffness is also offset by increased mass and inertia. Many time negative effects will also surpass their strengths, so users have to find other ways of bearing housing. In the use of small motors, a large percentage of the motor torque is used to restrain the inertia of the housing, which will severely impair the overall function of the piece.

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Bearing raceway noise problem

     The bearing noise of the bearing, the rolling sound is caused by the rolling of the rolling elements in the raceway when the bearing rotates to excite a smooth and continuous noise, which only attracts people's attention when its sound pressure level or tone is extremely large.

In fact, the sound energy stimulated by the rolling track is limited. For example, under normal conditions, the quality of the 6203 bearing raceway is 25 to 27 dB. This type of noise is the most typical of single row deep groove ball bearings that can withstand radial loads. It has the following characteristics:

a, noise, vibration is random;

b, the vibration frequency is above 1kHz;

c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;

d. When the radial clearance increases, the sound pressure level increases sharply;

e, the rigidity of the bearing seat increases, the lower the total sound pressure level, even if the rotation speed increases, the total sound pressure level does not increase much;

f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and the shape and size of the soap fiber can affect the noise value.

The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise.

Although the bearing raceway noise is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of the bearing and the precise use of the bearing to reduce noise and vibration.

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Bearing maintenance

Rolling bearings are a wide range of important mechanical basic components that are widely used in various fields of the national economy and national defense. The mechanical and working environment in which rolling bearings are used varies widely, so special attention should be paid to the maintenance of the bearings and the service life of the bearings. Bearing Installation Rolling bearings are precision parts that are of high precision and, if not properly installed, will lose their precision and performance and, in severe cases, cause bearing failure. Therefore, the site where the bearings are mounted and the installation tools must be cleaned to prevent various particulates from being carried inside the bearings. When installing and disassembling the bearing, it should not be directly hammered. Uniform pressure should be applied. When the shaft and the bearing are engaged with a large interference, the bearing should be installed immediately after heating.

Anti-rust of bearing products

The bearing is a precision mechanical part. From the factory to the long-term circulation. In order to prevent the bearing from rusting during transportation or storage under various environmental conditions, it must be rust-proofed. According to the national GB/TS597 standard. The rust prevention period of the bearing is half a year. Generally, the anti-rust period of the bearing is one year, and the anti-rust period of the bushing with higher requirements for use is two years. Bearings cannot be used during rust prevention for a variety of reasons. When the bearing rust prevention period is reached, the original rust inhibitor should be removed.

Bearing packaging

Since the bearings are precision parts and there are many circulation links, the products are easily damaged by environmental conditions such as snow, dust, temperature, corrosive substances during these circulation processes. Therefore, the bearing packaging is required to have multiple performances, such as shockproof, moisture-proof, anti-collision, anti-corrosion, and pressure resistance.

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