PURPOSE: To reduce the frictional abrasion of the rolling ball bearing of a spindle motor in a magnetic disc device and a ball in contact with this rolling ball bearing.YODA MARIKO依田 真里子MARUO TSUNEHIRO丸尾 恒弘ENOMOTO KENJI榎本 健司...
The resistance to movement that occurs when two objects are in contact. It is friction, for example, that slows down a ball rolling on grass and causes the blade of a saw cutting wood to get hot. There is less friction between smooth surfaces than between rough surfaces. Friction can be ...
the frictional force is a function of the normal load on the contact, F = μP, where μ is the Coefficient of Friction (COF) and P is the normal load; and 2. the frictional force is independent of a nominal area of contact. These two statements constitute what is known as the laws...
as in ball and roller bearings. The main cause of friction in rolling appears to be the distribution of energy involved in the twisting of the objects. If a hardball is rolling on a level surface, the ball is somewhat packed down and the level surface is somewhat indented in the regions...
Tags Force Frictional force Rolling Rolling without slipping Slipping In summary, the problem posed is about a spool resting on a horizontal surface and being pulled with a force T by a string wrapped around its middle section. The total frictional force on the spool is determined in terms of...
Twitter Google Share on Facebook friction torque (redirected fromFrictional torque) [′frik·shən ‚tȯrk] (mechanics) The torque which is produced by frictional forces and opposes rotational motion, such as that associated with journal or sleeve bearings in machines. ...
Mathematical models for those three fundamental techniques: the follow shot, the stop shot, and the draw shot, are developed by incorporating the rolling resistance. The friction betweenthe surface and the ball, and the dent on the surface due to the mass of the ball are considered. Further...
Cage Instabilities in High-Speed Ball Bearings The dynamic model of the cage in high-speed ball bearing was developed according to the geometry and force relationship between bearing elements. Based on ... ZH Ye,LQ Wang - 《Applied Mechanics & Materials》 被引量: 6发表: 2013年 Thermally-Indu...
a rolling ball contact. In Fig. 1a a ball rolls without spin on a plane elastic surface. Because of the different relative surface speeds across the contact patch, the well-known Heathcote slip case occurs. In Fig. 1b, the case of a ball rolling between ...
PROBLEM TO BE SOLVED: To provide a friction agitation spot joining device which miniaturizes the device by eliminating the generation of tumbling torque due to pressing force by aligning the axial center of a ball screw for generating the pressing force and an axial center of an agitation motor...