The pressure should be directly applied to the end face of the tightly fitted ferrule. No pressure can be transmitted through the rolling elements. The following methods are generally adopted for bearing installation:
When the outer ring of the bearing is tightly fitted with the bearing seat hole and the inner ring is loosely fitted with the shaft, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole.
If the bearing ring, the shaft and the seat hole are tightly fitted, the inner and outer rings of the installation chamber shall be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve shall be capable of simultaneously tightening the inner ring of the bearing and the end face of the outer ring.
Heating fit
By heating the bearing or the bearing housing, thermal expansion is used to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before the hot loading, place the bearing or the sleeve of the separable bearing into the oil tank and heat it uniformly 80-100°C. Then remove the oil from the oil and install it on the shaft as soon as possible. After cooling, the end face of the inner ring and the shoulder of the inner ring do not adhere tightly, and the bearing can be axially fastened after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing block, the hot mounting method of the heating bearing block can prevent the mating surface from being scratched.
When using a fuel tank to heat the bearing, there should be a grid at a certain distance from the bottom of the tank, as shown in Figure 2-7, or use a hook to suspend the bearing. The bearing cannot be placed on the bottom of the tank to prevent impurities from entering the bearing or being uneven. Heating, there must be a thermometer in the tank, strictly control the oil temperature shall not exceed 100 °C, in order to prevent the occurrence of flashback effect, so that the hardness of the ring is reduced.
Thrust bearing installation
The completeness of the thrust bearing and the fit of the shaft is generally a transition fit. The fit of the seat ring and the housing bore is generally a clearance fit, so this type of bearing is easier to install. The shaft of the double direction thrust bearing should be fixed on the shaft to prevent relative Rotate on the shaft.
The installation method of the bearing is generally the case where the shaft rotates. Therefore, the cooperation of the inner ring and the shaft is a win-win cooperation, and the cooperation of the outer ring of the bearing and the bearing room is a clearance fit.
1) Preparation of bearings
Since the bearing is rust-proof and packaged, do not open the package until it is installed.
In addition, the rust-proof oil applied on the bearing has good lubricating properties. For general-purpose bearings or grease-filled bearings, they can be used without cleaning. However, for instrument bearings or bearings used for high-speed rotation, a clean cleaning oil is used to wash off the rust-proof oil. At this time, the bearing is likely to rust and cannot be placed for a long time.
2) Inspection of shafts and housings
Clean the bearing and housing and confirm that there are no burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand, chips, etc. in the housing.
Secondly, check whether the size, shape and processing quality of the shaft and housing are in accordance with the drawings.
Before installing the bearing, apply mechanical oil to the mating surfaces of the tested shaft and housing.
As most of the shaft rotation, the inner ring and the outer ring can adopt interference fit and clearance fit respectively. When the outer ring rotates, the outer ring adopts interference fit.
(1) Press-fit installation
The press-fit installation generally utilizes a press, bolts and nuts are also available, and a hand hammer can be used to install the machine.
(2) Hot set installation
After the bearing is heated in the oil to expand it and then installed on the shaft, the hot sleeve method can prevent the bearing from unnecessary external force and complete the installation work in a short time.
Heating precautions:
1) General heating should not exceed 100 degrees Celsius.
2) Do not allow the bearing to contact the bottom of the oil sump.
In addition, the hot sleeve installation can also use the induction heating device to heat the bearing to expand it and then install it on the shaft.
When the outer ring of the bearing is tightly fitted with the bearing seat hole and the inner ring is loosely fitted with the shaft, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole.
If the bearing ring, the shaft and the seat hole are tightly fitted, the inner and outer rings of the installation chamber shall be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve shall be capable of simultaneously tightening the inner ring of the bearing and the end face of the outer ring.
Heating fit
By heating the bearing or the bearing housing, thermal expansion is used to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before the hot loading, place the bearing or the sleeve of the separable bearing into the oil tank and heat it uniformly 80-100°C. Then remove the oil from the oil and install it on the shaft as soon as possible. After cooling, the end face of the inner ring and the shoulder of the inner ring do not adhere tightly, and the bearing can be axially fastened after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing block, the hot mounting method of the heating bearing block can prevent the mating surface from being scratched.
When using a fuel tank to heat the bearing, there should be a grid at a certain distance from the bottom of the tank, as shown in Figure 2-7, or use a hook to suspend the bearing. The bearing cannot be placed on the bottom of the tank to prevent impurities from entering the bearing or being uneven. Heating, there must be a thermometer in the tank, strictly control the oil temperature shall not exceed 100 °C, in order to prevent the occurrence of flashback effect, so that the hardness of the ring is reduced.
Thrust bearing installation
The completeness of the thrust bearing and the fit of the shaft is generally a transition fit. The fit of the seat ring and the housing bore is generally a clearance fit, so this type of bearing is easier to install. The shaft of the double direction thrust bearing should be fixed on the shaft to prevent relative Rotate on the shaft.
The installation method of the bearing is generally the case where the shaft rotates. Therefore, the cooperation of the inner ring and the shaft is a win-win cooperation, and the cooperation of the outer ring of the bearing and the bearing room is a clearance fit.
1) Preparation of bearings
Since the bearing is rust-proof and packaged, do not open the package until it is installed.
In addition, the rust-proof oil applied on the bearing has good lubricating properties. For general-purpose bearings or grease-filled bearings, they can be used without cleaning. However, for instrument bearings or bearings used for high-speed rotation, a clean cleaning oil is used to wash off the rust-proof oil. At this time, the bearing is likely to rust and cannot be placed for a long time.
2) Inspection of shafts and housings
Clean the bearing and housing and confirm that there are no burrs left by scratches or machining. There must be no abrasive (SiC, Al2O3, etc.) sand, chips, etc. in the housing.
Secondly, check whether the size, shape and processing quality of the shaft and housing are in accordance with the drawings.
Before installing the bearing, apply mechanical oil to the mating surfaces of the tested shaft and housing.
As most of the shaft rotation, the inner ring and the outer ring can adopt interference fit and clearance fit respectively. When the outer ring rotates, the outer ring adopts interference fit.
(1) Press-fit installation
The press-fit installation generally utilizes a press, bolts and nuts are also available, and a hand hammer can be used to install the machine.
(2) Hot set installation
After the bearing is heated in the oil to expand it and then installed on the shaft, the hot sleeve method can prevent the bearing from unnecessary external force and complete the installation work in a short time.
Heating precautions:
1) General heating should not exceed 100 degrees Celsius.
2) Do not allow the bearing to contact the bottom of the oil sump.
In addition, the hot sleeve installation can also use the induction heating device to heat the bearing to expand it and then install it on the shaft.
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