Languages: English

Sales Network

In the domestic market, our products are sold to dealers and host factories throughout all provinces, municipalities and autonomous regions.
In the global market, the company has the self-support rights to import and export, our products are exported to more than 20 countries and regions such as the United States, Germany, South Korea, Italy and Spain and etc..
Prior Sales-Service
  • Professional techniacal researches for engineering applications
  • Provide guidance for bearing type selection , choosing the optimial design ,reducing customer’s cost and ensuring operating performance of the equipment.
  • Helping custoners and providing overall solutions.
  • Reducing operating costs for customers.
In Sales-Service
  • Providing customers with transportation arrangements and related services.
  • Assisting customers in handing inspections.
After Sales-Service
  • Providing customers with training about bearings installation , operation and maintenance.
  • Ensuring stable operation of equipment , improving equipment performance and reducing breakdown time.
  • Providing bearing failure analysis.

Q1. Preparation before assembly

  • a. Inspection and repair for shaft
    a.1 Inspect the journal of its eccentricity, bending and diameter variation (ellipse)
    a.2 Inspect the journal of its surface roughness
    a.3 Inspect the journal of the shoulder perpendicularity and the diameter of rounded corner of the shoulder root.
    a.4 Inspect the size of the shoulder, a micrometer or a dial indicator can be used
    b. Inspection and repair of housing bore
    b.1 Inspect the oval and cylindricity of the housing bore
    b.2 Inspect the perpendicularity of the housing bore and shoulder
    b.3 Inspect the abrasion loss and coaxiality of the housing bore

Q2. Installation method of rolling bearings

  • There are three installation methods of mechanical method, hydraulic method and heating method for installation of bearings. For installation of a small size (<80mm) bearing with cylindrical bore, if the fit is not too tight and it can be installed by gentle tapping with a hammer, then the mechanical method can be used. It is best to use a mild steel spherical surface mounting sleeve for installation; if the fit is tight, a mounting sleeve must be used on the bearing rings (inner or outer ring), and it must be prohibited to use a hammer to directly tap the bearing ring. The hydraulic method can reduce the force of installation or disassembly, which is suitable for the installation of medium or large bearings with tapered bores; the heating method is suitable for installation of bearings with cylindrical bores of tight fits and the situation when the mechanical method cannot be used.


    When installing a bearing, the forces of installation and disassembly should be applied for the end face of the closing ring with tight fit, which cannot be transferred through the rolling elements, because it will cause indentations on the working surface of the bearing affecting normal operation of the bearing and even damaging the bearing. The bearing’s cage, sealing ring, dust cover and other parts are easy to be deformed, stress for installation and disassembly of the bearing should not be applied on these parts; equal stresses must be applied for the circle of the end face of the bearing to press the rings in, tools such as a hammer must not be used to directly tap the end face of the bearing so as not to damage the bearing. In case of smaller magnitude of interference, the end face of the bearing ring can be pressed with the sleeve at room temperature and tap the sleeve using the hammer, and the ring can be pressed in uniformly through the sleeve. For mass installation, a hydropress can be used and it should be ensured that the end face of the outer ring is compacted tightly with the end face of the housing shoulder, no gap between them is allowed.

Q3. Operation inspection and maintenance for installed rolling bearings

  • a Operation inspection after installation
    Whether a bearing is installed correct or not has a direct influence on its service life and the precision of equipment. If it is not properly installed, there is not only vibration, big noise, low precision, increasing temperature, and also a danger of burn out; on the contrary, proper installation will not only guarantee the precision, and also prolong its service life. Therefore, inspections must be carried out after installation of bearing. The key inspection items are as follows:
    a.1 Installation position
    a.2 Radial clearance
    a.3 Close degree of the bearing and shoulder
    b. Maintenance of bearing
    The safety operation of bearings is our final purpose, however, it is cannot be achieved only depending on good bearing quality, there are other factors affecting the service life of every bearing, mainly including environment, appropriate lubrication, maintenance schedule and monitoring for the bearing conditions:
    For the operational environment, if you want to make the machine operate in its best condition, the bearing must be aligned correctly and working under extremely high temperature, humidity and pollution must be avoided. Appropriate lubrication, maintenance schedule and monitoring for working conditions of bearing are also very important for a bearing to work at its highest service life.
    b.1. Monitoring
    Regular inspection and monitoring at fixed points should be performed for the working conditions of bearings during equipment operation. Sensory methods such as hearing, touching and smelling are generally used at fixed points on the bearing boxes to monitor. You must immediately stop the equipment to check the occurrences of abnormal sounds, peculiar smells and abnormal temperature rise.
    b.2 Lubricating
    Regular replacement and supplement of lubricants shall be done for daily bearing maintenance. Most damages of bearings are due to incorrect lubrication modes and insufficient lubrication. It is very important for regular replacement and supplement of lubricants. According to the current statistics, grease is applied for lubrication of about 90% bearings. Therefore, a reliable supply of appropriate greases appears especially important.

Q4. Disassembling of rolling bearing

  • Both assembling and disassembling of bearing need to be careful. Take care not to damage the shaft or bearing seat when disassembling, it needs to be more careful for re-assembled or re-processed bearings after disassembling. For parts remained for failure analysis, take care not to damage bearings and various parts. It is very difficult to remove bearings having been running for a long time from main engine, especially for disassembling of bearings with interference fit, the operation is difficult. Therefore, facilitation for disassembling should be considered in advance in the design phase, and it is also very important to design and make disassembling tools according to requirements, when disassembling, researching for the disassembling method and sequence and investigating the matching condition according to the drawing to make the disassembling successful.
    An appropriate puller should be used to pull a bearing out, knocking on the bearing by a chisels or hammer is not allowed when disassembling. An appropriate disassembling tool should be selected for a disassembled bearing required to be used again, and when disassembling a ring with interference fit the tension should be only applied on the ring, it is never permitted to transfer the force of disassembly through the rolling elements, otherwise, the rolling elements and the raceway will be crushed.
    The conventional bearing disassembling methods include:
    a. Mechanical method
    The mechanical method is a traditional method most widely used to disassemble bearings of tight fit.
    b. Heating method
    The heating method is suitable for short cylindrical roller bearings.
    c. Hydraulic method
    The hydraulic method is suitable for bearings with tapered bores or workpieces of very tight fit which require preset holes and grooves.
    General sequence of disassembly of bearing: first, try to apply a tension on the ring (generally the inner ring) with an interference accessory, if it can not touch the inner ring, then pull the outer ring, align the puller and the pressed shaft (if they are not aligned in advance), and then apply force and rotate the puller to pull the bearing out. Safety problems involved in disassembly:
    a. Impacting bearing
    Impacting bearing may result in smash of some bearing steel, as some brittle elements may be used inside the bearing, the steel fragments may lead to serious damages.
    b. Torch cutting bearing
    If use the torch cutting method to cut a bearing, the grease inside it may cause a fire or explosion, gas produced by combustion of sealing elements may cause lung injuries and the molten sealing elements may burn your skins, therefore, a pair of PVC gloves must be worn to operate and it is not recommended to perform torch cutting for any bearings.
    c. Minimum protective equipment for disassembly with non-recommended methods
    When using non-recommended methods to disassemble, at least the following protective equipment shall be ensured: safety helmet, safety glasses, a full set of protective clothing and gloves.
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Languages: English