Needle roller bearing design

Needle roller bearing how to design a release date: 2019 - 06 - 04 14:30:10 click: 59 needle roller bearings are used in most cases at low speed, swing movement or static load of work environment, the design of this kind of bearing roller clearance and internal and external to the choice of tolerance is correct with its performance also has a lot to do. Described below under the design method and the basic knowledge of needle roller bearing: first of all know about the full needle roller bearing, its tolerance level for general G2 level, group difference of 0 ~ 7 um, its needle for arc element first, but the design method of straight line needle is also of great benefit. Circumferential clearance between the determination of S, the mean average each needle clearance for 5 um, when the needle diameter less than or equal to 305 mm, the so-called 'S minimum not less than 0. 1 mm, that is to say, the number of needle should be less than 20 grains. On the contrary, when the diameter of the full needle roller bearing is greater than 3. 5 mm, S minimum not less than zero. 15 mm, that is, the number of needle must be less than 30 grains, so it S value can only be 0. 15mm。 Followed by the determination of central circle diameter of the needle, this design is mainly embodied in bearing the ideal state, and the needle can evenly distributed in the center of the needle diameter, and central circle diameter of needle can have its unique formula to calculate. And then the original needle bearing radial clearance, the original design mainly depends on the needle diameter clearance, its inner raceway diameter and the selection of the roll to the outside diameter tolerance. Form a complete set of, of course, this method is according to the usual method and the long-term production experience, so as to get more effective original radial clearance. Finally is the determination of limit speed because the needle is between cling to the opposite direction to sliding, it keep call is needed to produce great friction and heat, but also for needle roller clearance is small, so the roots of its corresponding grease storage space is much smaller, the lubrication time interval will be shorten as. A: one-way needle roller bearing is introduced in the next article: using one-way needle bearing maintenance matters needing attention