Whether NTN bearing is installed or not will affect the accuracy, service life and performance of NTN bearing. Therefore, please fully study the installation of NTN bearing, that is, Rolling Ntn Bearing please install NTN bearing according to the operating standards including the following items.
1. Clean NTN bearings and related parts. Grease lubricated NTN bearings and both sides are provided with oil Rolling Ntn Bearing seals or dust covers. The sealing rings do not need to be cleaned before NTN bearings are installed.
2. Check the size and finish Rolling Ntn Bearing machining of relevant parts
3. Installation method the installation of NTN bearing shall be determined according to the structure and size of NTN bearing and the matching nature of NTN bearing components. The pressure shall be directly added to the end face of the tightly matched ferrule, and the pressure shall not be transmitted through the rolling element. The installation of NTN bearing generally adopts the following methods:
The inner ring of NTN bearing fits tightly with the shaft. When the outer ring fits loosely with the NTN bearing seat hole, the NTN bearing can be press installed on the shaft first, and then the shaft and NTN bearing can be installed into the NTN bearing seat hole. During press installation, an assembly sleeve (copper or mild steel) made of soft metal material shall be padded on the inner ring end face of NTN bearing.
The inner diameter of the assembly sleeve shall be slightly larger than the journal diameter, The outer diameter shall be slightly smaller than the Rolling Ntn Bearing retaining edge of NTN bearing inner ring to avoid pressing on the cage. The outer ring of NTN bearing fits tightly with the hole of NTN bearing seat. When the inner ring fits loosely with the shaft,
NTN bearing can be pressed into the hole of bearing seat first. At this time, the outer diameter of assembly sleeve should be slightly smaller than the diameter of the hole. If the NTN bearing ring is tightly matched with the shaft and seat hole, the inner ring and outer ring in the installation chamber shall be pressed into the shaft and seat hole at the same time,
and the structure of the assembly sleeve shall be able to press the Rolling Ntn Bearing end faces of the inner ring and outer ring of NTN bearing at the same time.
By heating the NTN bearing or bearing seat, the installation method of changing the tight fit into the loose fit by using thermal expansion. It is a common and labor-saving installation method. This method is suitable for the installation of NTN bearing with large interference. Before hot installation, put the ferrule of NTN bearing or separable NTN bearing into the oil tank and heat it evenly for 80-100 ℃,
then take it out of the oil and install it on the shaft as soon as possible. In order to prevent the end face of inner ring and shaft shoulder from not fitting tightly after cooling, NTN bearing can be tightened axially after cooling. When the outer ring of NTN bearing is tightly matched with the NTN bearing seat made of light metal, the hot installation method of heating the NTN bearing seat can avoid scratching the mating surface.
When heating the NTN bearing with the oil tank, there shall be a mesh grid at a certain distance from the box Rolling Ntn Bearing bottom, or the NTN bearing shall be hung with a hook.
The NTN bearing shall not be placed on the box bottom to prevent sinking impurities from entering the NTN bearing or uneven heating. There must be a thermometer in the oil tank, and the oil temperature shall be Rolling Ntn Bearing strictly controlled not to exceed 100 ℃ to prevent tempering effect and reduce the hardness of the ferrule.
The tapered hole bearing can be directly installed on the journal with taper, or on the conical surface loaded with fixed sleeve and demounting Rolling Ntn Bearing sleeve. The tightness of its fit can be measured by the reduction of radial clearance of NTN bearing.
Therefore, the radial clearance of NTN bearing should be measured before installation. During installation, the Rolling Ntn Bearing clearance should be measured frequently to achieve the required reduction of clearance. Lock nut is generally used for installation, Heating installation method can also be used.
The fit between the circumference of the thrust bearing and the shaft is generally a transition fit, and the fit between the race and the NTN bearing seat hole is generally a clearance fit. Therefore, this NTN bearing is easy to install. The middle shaft spring of the two-way thrust bearing should be fixed on the shaft to prevent rotation relative to the shaft.
Generally, the installation method of NTN bearing is mostly shaft rotation, so the fit between inner ring and shaft is win-win fit, and the fit between outer ring of NTN bearing and NTN bearing chamber is clearance fit.