Miniature bearing installed correctly or not has a direct impact on its life

Miniature bearing installed correctly or not, and the host accuracy has a direct influence to the life. If improperly installed, bearing not only have a vibration, noise, low accuracy, increasing temperature, but also be jammed the danger of burn out; Conversely, install well, can not only guarantee the accuracy, life will be greatly extended. As a result, the miniature bearing installed, must be tested. Key inspection items are as follows: 1. Inspection installation location miniature bearings after installation, the first test whether running parts and fixed parts touching one another, lubricating oil can flow to flow into the bearing, seal device and axial fastening device installed correctly. 2. Inspection preloaded of radial clearance in addition to the installation with needle roller bearing, the radial clearance shall be checked. Deep groove ball bearings available hand rotation test, in order to smooth and flexible, no vibration, no swinging as well. Cylindrical roller bearing and spherical roller can examine feeler, feeler will be inserted between the roller and bearing ring, feeler insertion depth should be more than half the length of the roller. When the bearing radial clearance cannot be measured with a feeler, measurable bearing in axial travelmotion, instead of the decrease of the radial clearance. Under normal circumstances, such as bearing inner ring for the cone hole, in axial movement on the surface of the cone is radial clearance to reduce the quantity of about 15 times. Needle roller bearing radial clearance, some unqualified can be adjusted after installation, such as the angular contact ball bearings, tapered roller bearings; Some are in manufacturing has been adjusted according to the prescribed standards and unqualified can no longer after installation and adjustment, such as deep groove ball bearings, self-aligning ball bearings, cylindrical roller bearing, spherical roller bearing, etc. If this type of bearing is installed by the inspection is unqualified, radial assembly clearance is too small, the improper selection of bearing with or assembled parts processing is not correct. At this point, the bearing must be unloaded, find out the reason, to be eliminated. Of course not bearing clearance is too large. 3. Test needle roller bearing and the shaft shoulder by tight degree in general, the tight fit interference installation of the bearings must rely on shoulder. Test method: 1) Lighting method. The lights on the bearing and shaft shoulders, see light-leaking judging. If not light-leaking, installed correctly; If uniform around the shoulder light-leaking, bearing with shoulder to rely on tight, deal with bearing put pressure on tight; If some light-leaking, bearing installation tilt, available hit bearing inner ring hammer, tongbang, or socket, trued slowly. ( 2) Thickness gauge test. The thickness of the thickness gauge shall be 0. 3 mm. Test, the bearing inner ring end face and shoulder the entire circumference try several, and if found to have clearance is very uniform, bearing is not installed in place, inflating a bearing inner ring to make it on the shoulder; If increase the pressure also is not tight, journal fillet area of rounded corners is too large, the bearing stuck, should trim journal fillet, make its become smaller; If it is found that bearing inner ring end face and bearing shoulder parts thickness gauge can pass, not at this time must be removed, to nap, reinstall. If bearing for interference fit is mounted on the bearing hole, bearing outer ring is fixed, shell hole block shoulder its outer end face and the shell hole blocking shoulder face is on tight, installation is correct, also can examine thickness gauge. Thrust test installation of miniature bearing installed thrust bearing, axis circle shall be checked and verticality of shaft centerline. Method is to fix the dial gauge box shell end face, make the table touch the top of the head of the ring raceway on bearing axle bearing, and observe the dial gauge pointer, if the pointer deflection, axial circle and not vertical shaft centerline. Box shell hole deep, also can use extended dial gauge head test. Thrust bearing installed correctly, the seat can automatically adapt to roller rolling, to ensure that the rolling elements located at the top and bottom ring raceway. If installed backwards, bearing not only don't work properly, and the matching surface will badly worn. Due to axial ring and seat and the difference is not obvious, the assembly should be extra careful, do not make a mistake. In addition, the seat of thrust bearing and the bearing holes should also be left between 0. 2 - 0. 5 mm clearance to compensate parts processing, installation error caused by inaccurate, when the bearing ring during operation center offset, the clearance can be adjusted to ensure the automatic, the avoidance of friction, make its normal operation. Otherwise, will cause bearing severe damage. Jiaxing bearing hardware co. , LTD. In production and sales of precision miniature bearing, small bearings and plastic bearings as the main business, always adhere to the 'good faith management, common development' concept, for decades, business development, has now become a miniature motor, artificial intelligence, unmanned aerial vehicles, computers, household appliances, medical equipment, instruments, sports equipment and other industries, and household hardware, automatic door, shower room, closet, doors and Windows pulley bearing supplier and other industries. 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