1: ntn bearing speed decision factors:When ntn bearing load conditions in the 0.1C running, as the rolling element and raceway contact surfaces increases the contact stress to the heart, has led to ntn bearing operating temperature increased, the performance of the lubricant reduces. Therefore, the speed limit imports of bearings will be reduced accordingly. In this case,
More top tight radial method used in radial load bearing tapered hole, the typical example is the double row precision cylindrical roller bearings, using nuts to adjust the tapered journal bearing relative to the axial position, so that within circle have the right volume by radial expansion of the negative clearance, the method for machine tool spindle and multi-jet engine.Axial preload law tightening and positioning in general can be divided into two constant pressure preload.
1: ntn bearing the international standards:China Bearing Industrial Association (CBIA)American Bearing Manufacturers Association (ABMA)American National Standards Institute (ANSI)Japanese Industrial Standards Committee (JISC)Standards Engineering Society
International Organization for Standardization (ISO)Scandinavian Bearing Association (SBA)German National Standards Organization (DIN)
Japanese Standards Association (JSA)Typically, ntn bearing the criteria used are ISO standards.
ntn bearing clearance adjustment. Radial bearing clearance with top clearance, side clearance, shown in Figure 1. Tip clearance can be kept liquid friction, the numerical size of shaft, rpm, the viscosity of the oil. Generally between control I/lO00d ~ 3/lOOOd (d axis diameter). Backlash is the role of the accumulation and cooling lubricants, the formation of the oil wedge,
ntn bearing support choose to pay attention to four problemsFirst, how to limit the axial position, including the radial and axial position are the first issues to consider. General dual-axis multi-support structure, the radial shaft supported by two co-limited, each supporting Department should play the role of radial positioning or angular contact bearings to the heart.Second, the axial position of supporting the restrictions by the two axial displacement in one direction is also limited by a supporting axial displacement in both directions,
ntn bearing kit and the outer ring of the processing methodsntn ball bearings machining process: ntn ball bearing raw materials processed by the state of the same vary, cut or ball of light which fell before the process can be divided into the following three, before heat treatment processes, but also divided into the following two kinds,the whole process are: bar or wire stamping (stamping bar after some red zone and annealing needed) - fell cut, coarse grinding,
We use the clutch ntn bearings need to pay attention to what time? This article will introduce this to be aClutch motor specifications; electric motor starting torque / rated torque; rated drive torque; operating speed range;Pieces of inertia driven "j"; over operating speed range; use of the number of life; shaft diameter.Position ClutchPositioning exercise frequency / per minute; positioning movement angle; rated torque; be driven pieces of inertia
ntn bearings require lubrication in order to ensure maximum service life, many users do not know how to lubricate bearings, causing premature bearing damage.ntn bearings bearing is not easy to bad lubrication is good, so so that bearing life is too short. Here is the relevant knowledge on the bearing area include the following aspects:1, first of all the various parts of the bearing lubrication, reducing bearing friction and wear;