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Selected profile rolling bearing type, bearing is a variety of types and sizes. In order to play the expected performance of mechanical device select the most suitable bearing is very important. For selected bearing, many will need to analyze and study from different angles, the choice of bearing program, there is no special specifications, but generally as follows:
(1) the control of machinery and bearing conditions of use, etc
(2) clear requirement for bearing
(3) select the type of bearing
(4) the selected bearing configuration mode
(5) the selected bearing size
(6) the selected bearing specifications
(7) bearing the installation method of bearing selected correctly grasp the conditions of use and environmental conditions of bearing in the use of machinery parts and use condition and environment is the premise of a suitable bearing. , need to get data and information on the following aspects:
(1) the mechanism of function and structure
(2) the use of the bearing parts
(3) bearing load (size and direction)
(4) the rotation speed
(5) the vibration and impact
(6) bearing temperature (ambient temperature, temperature)
(7) the surrounding atmosphere (corrosion, clean, lubricity) the choice of the ways of bearing configuration.
Usually, the shaft is two bearings in the radial and axial support, at this point, called the bearing on one side of the fixed side bearing, it bear radial and axial load, the fixed axis and the relative axial displacement between the bearing box. Call the other side free side, only bear radial load, axial relative movement can be solved due to temperature change interval of the shaft and install the bearing of telescopic part of the error. For fixed side bearing, need to select available rolling surface in axial moving (e.g., cylindrical roller bearing), or to move assembly surface, such as the centripetal ball bearings bearings. On the short shaft, the fixed side and free side little other cases, the use of one-way only fixed axial moving bearing (e.g., angular contact ball bearing).
Bearing installation process:
Must master a principle that can pass through the corresponding ring installation force or moment. Force fit tight fit bearing inner ring and the shaft, the outer ring and bearing hole is a loose fit, press the bearing to be pressed on the shaft are available, and then put the shaft together with the bearing load bearing hole, when pressed on the bearing inner ring end face, cushion the assembling casing made of a soft metal material (copper or mild steel). Bearing outer ring and bearing hole tight fit, inner ring and the shaft is a loose fit, the bearing can be pressed into the bearing hole first, then assembling casing diameter should be slightly less than the diameter of a hole. If the bearing ring and shaft and hole is a tight fit, install indoor ring and outer ring to pressure into the shaft and hole, at the same time assembling casing structure should be able to at the same time, so the bearing inner ring and outer ring end face.
Heating with
By heating bearing or bearing seat, by using thermal expansion will fit into a loose fit installation method. Installation method is a kind of common and energy saving.
This method is suitable for interference quantity larger the installation of the bearings, the bearing before hot charging type or separable bearing ring into the fuel tank even heat 80-100 ℃, and then loaded on the shaft, as soon as possible out of the oil to prevent inner ring after cooling end face and shoulder joint is not tight, bearing axial fastening again after cooling. Bearing outer ring and light metal bearing seat tight fit, by heating the hot charging method of the bearing, can avoid the mating surface scratch. With heating tank bearing and should be at a certain distance from the bottom of a WangShan, hanging hooks in the bearings, bearing on the bottom, in case of heavy impurities into the bearing or uneven heating, fuel tank must have a thermometer, strictly control the oil temperature shall not exceed 100 ℃, in order to prevent the tempering effect, reduce the hardness of the ring.
The installation of thrust bearing
Of the thrust bearing of thorough and axis coordinate is commonly transition fit, seat and bearing holes with the general as clearance fit, so this kind of bearing is easy to install, two-way thrust bearing axial spring should be fixed on the shaft, in order to prevent the relative to the axis of rotation. Bearing installation method, usually is the situation of the axis of rotation, so with the inner ring and shaft for win, with the bearing outer ring and bearing chamber for clearance fit.
Bearing inspection after installation of bearing operation to inspect, should guarantee the bearing installed, flexible rotation, no card lag phenomenon, such as bearing improperly installed, can make the bearing temperature rise quickly and damage, even bearing jammed fracture and other major accidents. The use of the bearing and preservation
(1) when used in bearing, to keep the environment clean, do not stick to fit the sweat and dirt. Regulations by the personnel familiar with the bearing is used, special need to be careful, indentation, less damage, etc. In order to guarantee the use of the bearing performance, should be whether the equipment operation standard, regular maintenance, maintenance and overhaul of bearing, including monitoring running state, added lubricant, remove the check on a regular basis.
(2) bearing may not directly on the ground storage (more than 30 cm) from the ground, to avoid direct light and the wall of the cold. In order to prevent rust, custody is about 20 ℃ temperature and humidity of less than 65% of the environment, the bearings are placed in the acid in the air, easy to rust, color change, want to use gloves, cotton waste wipes bearing, axis, a hood, garbage into the bearing internal reason and cooperate with the part is an exception occurs, so need to pay attention to.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-HM911242/HM911210 NTN | 53.975 | 130.175 | 33.338 |
| 4T-557S/552A NTN | 53.975 | 123.825 | 36.678 |