Import & Export & Mechanical - Centbro International Trading Co, LTD.
Needle roller bearings (needle bearing) with cylindrical roller bearings, relative to its diameter, roller is fine and long. This is called needle roller. Although it has a small section, the load bearing capacity of the bearing is still high, with thin and long needle bearing roller (roller diameter of D = 5mm, L/D = 2.5, L roller length), so the radial structure is compact, the minimum diameter of the diameter and load capacity and other types of bearings, bearing the same, especially for the structure in radial installation size limited.
With thin and long needle bearing roller (roller diameter of D≤5mm, L/D≥2.5, L roller length), so the radial structure is compact, its diameter and load capacity and other types of bearings at the same time, minimum diameter, especially for supporting results in radial installation size limited. According to the use of different occasions, can choose the inner ring of the bearing or needle roller and cage assembly, the shaft neck surface and the surface of shell holes matched with a bearing directly as the bearing inner and outer rolling surface, in order to ensure the load capacity and operating performance and have the same ring bearing, shaft or housing bore raceway surface hardness the machining precision and the surface quality of bearing ring raceway and similar. Such bearings can only bear radial loads.
Install full complement needle roller bearings, usually carried out using an auxiliary sleeve. Then, the auxiliary roller or auxiliary sleeve to hold the needle to needle fell out, with its own journal chamfer off the needle, the needle roller bearings to move slowly in the shaft neck and the auxiliary roller or auxiliary sleeve will gradually withdraw until loaded into the working position so far.
The outer diameter of the auxiliary roller and the auxiliary sleeve should be smaller than the diameter of the shaft 0.1 to 0.3mm. When installed, the first bearing surface coated with grease, tightly placed within the surface mount needle (a needle into the final gap should be left), and then to replace the shaft or the auxiliary roller bearing inner ring or auxiliary sleeve into the outer hole, and the end of shaft or bearing installation alignment the end face of the inner ring is mounted on the shaft, then press or hammer hand pressure.
Advantages And Usability
With thin and long needle bearing roller (roller length is 3~10 times the diameter, diameter less than 5mm), so the radial structure is compact, the size of the inner diameter and the load bearing capacity and other types at the same time, minimum diameter, especially for the supporting structure of radial installation size limited. Needle roller bearings according to the use of different occasions, the machining accuracy and surface quality of bearing ring, use combination. The needle roller bearing is a bearing unit composed of needle roller bearing and thrust bearing components.