What is a floating ring bearing? The characteristics and working principle of floating ring bearing

A, what is floating ring bearing? Floating ring bearing can also be called a floating sets of sliding bearing ( Sometimes referred to as: the floating bearing) , this kind of bearing is on the basis of the original structure of radial sliding bearing, add one or more can turn freely between journal and bearing of the shaft sleeve, the original a friction pair into two or more jobs at the same time, the friction pair of floating ring set on both sides of lubricating oil. Below to the working condition of roller bit floating sleeve bearing as reference, look down ring bearing structure, as shown in figure 1. Figure 1 cone bit floating ring bearing ( Floating set of sliding bearing) Specimen structure schematic 1 - Tooth claw ( Bearing inner vice) ； 2 - Cone ( External bearing pair) ； 3 - Floating bushing; 4 - Sealing ring floating ring bearing can be divided into two kinds: one kind of the floating bearing ( Floating ring rotation) , as shown in figure 2. The other is a half floating bearing ( Not rotating) , as shown in figure 3. Figure 2 floating bearings with figure 3 and a half floating bearing, the use of milk ring bearing characteristics of 1, 2 high running stability. The introduction of floating bushing, the radial bearing oil film from single membrane into a double film or film, proved by theory and test study on the high running stability. 2, high speed rotation of high precision. Because of its high running stability, so rotating in high speed with high accuracy and can be used as machine tools, such as the electric spindle bearing system. 3, compact structure, easy to adjust. Through the structural parameters optimization, can control the speed of floating bushing and bearing ratio. 4, friction, low power consumption, easy to control temperature. Due to the introduction of floating bushing, inside and outside the bearing running speed in different area, and the floating sleeve has a stable speed ratio, thus, bearing at high speed has lower friction loss. 5, longer than ordinary sliding bearing. Due to the low friction loss bearing in high speed, the heat dissipation and temperature changes can get better control, reduce the speed of bearing wear, prolong the service life of bearing. 6, suitable for operation under high speed and large load. Due to the introduction of floating bushing bearing relative speed is reduced, but also reduces the turbulence of the critical speed, can make the bearing under the high speed under high load. The working principle of three, milk ring bearings after joining floating bushing in the sliding bearing, axis neck or bearing, due to the friction will make floating rotation, both inside and outside the floating bushing lubrication conditions will be the form of oil film bearing capacity of a certain when the floating sleeve rotation speed reaches a certain value, the role of both inside and outside the floating bushing on the surface of the resultant force and the friction torque balance respectively, thus the original radial sliding bearing of a friction pair becomes to the floating inside and outside two friction pair, and each of the friction pair of relative sliding velocity is lower than the original bearings. By the principle of tribology, the sliding bearing friction power loss with the square of the friction surface between the relative sliding velocity change, but the only and the friction surface contact area of a linear change. After floating sleeve bearing the original bearing in two, because of the added a friction pair, so increased the friction of the contact area, but as a result of surface and reduce the friction between the relative sliding velocity, which reduces the bearing friction power loss. Therefore, if all the other parameters remain unchanged, as a result of the rotation of the floating sleeve will often make less resistance, followed by the friction power loss, bearing temperature drop and a series of changes. As shown in figure 4, when floating set of stable rotation, according to the equilibrium conditions, both inside and outside the oil film pressure on the floating sleeve of resultant force should be equal, in the opposite direction, and the internal and external two friction produce side effects on the floating bushing friction torque should be equal. Figure 4 cone bit floating ring bearing ( Floating set of sliding bearing) Specimen structure diagram 4, the design of floating ring bearing specimens and the processing and the design of the floating sleeve bearing is the key to the determination of its inside and outside clearance. For rock bit, the gap is greater than the outer space within the floating sleeve to vice friction driven turning out, have the effect of the friction pair in two. Therefore, on the basis of structure of cone bit bearing system, designed the three kinds of clearance fit, parts drawing and assembly drawing basic size of the specimens with the same structure. 1, the specimen by chengdu some manufacturing and processing machinery factory, three groups of photos of the specimens is shown in figure 5. Figure 5 cone bit floating ring bearing ( Floating sleeve bearing) Specimen with two or three bearing and clearance fit actual size of the specimens are shown in table 1. Inside and outside clearance than 1 respectively. 72, 3. 54, 0. 89, in order to verify the opening oil wedge affect the performance of floating set operation, floating set to open mouth floating set for number 3. Table 1 floating ring bearing ( Floating sleeve bearing) Specimen structure size table 3, figure 6 for installation in bearing experiment on tooth claw and the sensor above photos. Figure 8 is set with 3 magnets floating set of pictures and 'O' ring. Figure 6 installed on the bearing test machine tooth claw figure 7 set with 3 magnets floating bushing and 'O' ring