Selection of the bearing and the matters needing attention when using

Bearing selected profile type, type and size of rolling bearings is varied. To play the expected performance of mechanical device select the most suitable bearing is very important. For the selected bearing, many will need to analyze, study from different angles, the choice of bearing program, there is no special specifications, but generally as follows: ( 1) Master mechanical and bearing conditions of use (such as 2) Clear the requirement of bearing ( 3) Select the type of bearing ( 4) The selected bearing configuration mode ( 5) The selected bearing size ( 6) The selected bearing specifications ( 7) Selected bearing the installation method of bearing correctly grasp the conditions of use and environmental condition 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) Mechanism of function and structure, 2) The use of bearing parts ( 3) Bearing load ( Size, direction) ( 4) Rotation speed, 5) Vibration, shock, 6) Bearing temperature ( The surrounding temperature, temperature) ( 7) The surrounding atmosphere ( Corrosion, clean, lubricate) The choice of the ways of bearing configuration, usually axis in 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 to solve the axis of the telescopic part of the due to temperature change and install bearing interval error. For fixed side bearing, choosing available moving around the axial rolling surface, Such as cylindrical roller bearing) Or moving assembly plane ( If the centripetal ball bearings) The bearings. On the short shaft, the fixed side and free side little other cases, using unidirectional fixed axial mobile bearing ( Such as the angular contact ball bearing) 。 Bearing installation process: must master a principle, which 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 materials ( 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. Heated by heating the bearing or bearing seat, the use of 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 bearing, the bearing before hot charging type or separable bearing ring into the fuel tank 80 - uniform heat 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. Heating tank with bearing and should be at a certain distance from the bottom of a mesh, 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 the thrust bearing thrust bearing of the matching of the thorough and axis is commonly transition fit, seat and the bearing holes with the general for the 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 the inner ring cooperate for win cooperate with shaft, 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 bearing and custody ( 1) When used in bearing, 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 injury, indentation, owe 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 includes monitoring running state, added lubricant, remove the check on a regular basis. ( 2) Bearing may not directly on the ground storage ( To 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, discoloration, to use gloves, kapok, 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.