タイトルまたは説明

Needle Roller Bearings consist of a machined and ground channel-shaped outer ring with a component of needle rollers retained and guided by a cage. The high-strength cage retains and guides the rollers. An optional groove and hole in the outer ring facilitate relubrication. These bearings can be used with or without a machined or ground inner ring, depending on the suitability of the shaft as a raceway surface.Needle roller bearing is the roller bearing with cylindrical roller. The roller is thin and long compared with the diameter. This type of roller is called needle roller. Although it has a small section, the bearing still has high load bearing ability. Therefore, it is especially suitable for occasion where the radial space is limited. The contour surface slightly contract at the place near the end. The correction of contact between needle roller and raceway can avoid the destructive edge stress. The types of bearing only bear radical load. The needle roller bearing mainly used for gear pumps, sheaves, automotives transmissions and two-cycle engines.Full complement bearings have solid inner and outer rings and rib-guided cylindrical rollers. Since these bearings have the largest possible number of rolling elements, they have extremely high radial load carrying capacity and are suitable for particularly compact designs. Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four in each U joint) and often more if it is particularly long, or operates on steep slopes.Additional clarification of needle roller: According to "Marks' Standard Handbook for Mechanical Engineers", a needle bearing is a roller bearing with rollers whose length are at least four times their diameter.Buy needle roller, best bearings centry is good choice.