Bearing limit speed limit speed refers to the maximum speed allowed by the bearing under certain load and lubrication conditions. At this time, the inertial force of the rolling elements and the cage and the extremely small shape deviation not only cause a change in the operating state, but also cause an increase in the temperature between the friction surfaces and a change in the performance of the lubricating oil, thereby causing the rolling body to temper or the bearing components to fail. . The operational disturbances from which the bearing started to rotate have not been accurately determined. In all bearing sample data, the recommended limit speed values ​​for all types of bearings are only applicable to normal-grade bearings that are subjected to radial loads. The limit speed of the E704 bearing is not seen in the bearing sample, but it can be obtained from the simple summary calculation formula in the book "Rolling Bearing Manual" by the former Soviet Union, Beilman: ng=900000/(d+D) :d is the inner diameter of the bearing; D is the outer diameter of the bearing. The limit speed of the general-purpose G704 bearing is ng=14516r/min. Since the E704 bearing needs to carry radial load and axial load, the bearing accuracy grade is E grade, higher than the ordinary grade, so the actual limit speed and the calculated speed are slightly difference. The contact angle of the contact angle of the bearing refers to the angle between the line connecting the contact point between the ball and the inner and outer ring raceways and the center line of the channel, which is indicated by α. When the contact angle α of the deep groove (central) ball bearing is larger, the axial load carrying capacity is also stronger. When the bearing is only subjected to radial load, the contact angle α=0°; when the bearing portion is axially loaded, the contact angle α will vary between 5° and 15°. The change in contact angle will vary with the value of the radial clearance. The axial clearance of the bearing is in accordance with the national military standard GJB269-87 "Technical Conditions for Aviation Rolling Bearings". The E704 bearing only measures the radial clearance and does not measure the axial clearance. The specified radial clearance value is 0.01~0.024mm. The actual situation is: when the deep groove ball bearing carries the axial load, the inner outer ring has axial relative movement, even if the steel ball contacts the ferrule raceway, forming contact angle. The axial clearance of the bearing will vary with the contact angle. There is a certain geometric relationship between the radial clearance, the axial clearance and the contact angle of each type of ball bearing. Circular Knitting Machine Gear Circular Knitting Machine Gear,Knitting Machine Gear,Machine Knitting Parts,Knitting Machine Gears Changzhou Longfu Knitting Co., Ltd. , https://www.circularmachine.com