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The grease used in Timken bearing must have anti rust effect, and the anti rust agent can not be dissolved in water. The grease shall have good adhesion and can form an oil film on the steel surface. The grease will soften during machining, resulting in leakage. During normal operation, grease will be thrown into the bearing by Timken bearing seat. If the mechanical stability of the grease is not enough, the structure of the soap of the grease will be mechanically disintegrated during operation, resulting in the destruction of the grease and loss of lubrication. If the grease is selected incorrectly, all measures to prevent Timken bearing are futile.
It is very important to select a grease whose base oil viscosity can provide sufficient lubrication effect at the working temperature, Viscosity is mainly affected by temperature. It decreases with the increase of temperature. When the temperature decreases, it increases. Therefore, the base oil viscosity at operating temperature must be known. Machinery manufacturers usually specify the use of a certain grease, but most standard greases have a wide range of applications. In the process of using Timken bearings, grease is very critical. If deteriorated grease is used, it will not only fail to play its due role, but also damage Timken bearings.
Usually Timken bearings can be installed in limited space. In most cases, the shaft diameter (or bearing inner diameter) is limited by mechanical design or other design. Therefore, the selection of Timken bearing type and size is determined according to the inner diameter of Timken bearing. Therefore, the main dimension tables of Timken bearings are prepared according to the internal diameter dimensions of international standards. There are many sizes and forms of scale Timken bearings. Scale Timken bearings are used in the design of mechanical devices (this is designed to TIMKEN bearings easily, here is a digression, some TIMKEN bearing catalog models do have, but some non-standard TIMKEN bearings are not available in Chinese mainland, sometimes futures will be very long time, so when TIMKEN bearing selection, we should consider the cost of time and the cost of later replacement). The load of Timken bearing and the load applied on Timken bearing vary in nature, size and direction. Generally, the rated basic load is shown in the dimension table. However, axial load and radial load are also important factors in selecting suitable Timken bearing. When the size of ball and needle roller Timken bearing is commensurate, needle roller bearing usually has high load capacity and low bearing capacity Large vibration and impact load.
According to the type, size, accuracy, cage type, load, lubrication mode, cooling mode and other factors of Timken bearing. Timken bearing table lists the allowable speed of scale precision Timken bearing under oil lubrication and grease lubrication. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation.
For machines requiring high precision and high-speed operation, Timken bearings with precision of grade 5 or above are recommended. Deep groove ball bearings, centripetal thrust ball Timken bearings or cylindrical roller Timken bearings are suitable for machines with high operation precision. Rigid, elastic deformation will occur when the contact surface between the moving elastic body and the raceway of the bearing is compressed. Some machines need to minimize elastic deformation. Roller Timken bearings produce less elastic deformation than ball Timken bearings.
This procedure is usually used for deep groove ball Timken bearings, centripetal thrust ball bearings and tapered roller bearings. Inner and outer ring offset, shaft bending, tolerance change of shaft or Timken bearing housing, and matching error will lead to inner and outer ring eccentricity. In order to prevent excessive eccentric angle, self-aligning ball bearing, self-aligning roller bearing, or self-aligning bearing seat are better choices. Voice frequency and torque, dynamic Timken bearings are manufactured according to high-precision standards, so voice and torque are small. Deep groove ball bearings and cylindrical roller bearings are used for occasions with special requirements for low noise and low torque.
In some applications, disassembly and installation are often required to ensure that inspection and maintenance can be carried out according to its place. Timken bearings with separate inner and outer rings, such as cylindrical bearings, needle roller bearings and conical bearings, are very suitable for this occasion. With the help of the shaft sleeve, the installation procedure of the taper hole type self-aligning ball bearing and self-aligning roller bearing is also simplified.