ball bearing noun
: a part of a machine in which another part (such as a metal pole) turns easily
: one of the balls in a ball bearing
: a bearing in which the journal turns upon loose hardened steel balls that roll easily in a race; also : one of the balls in such a bearing
First Known Use of BALL BEARING
ball bearing noun (Concise Encyclopedia)
One of the two types of rolling, or antifriction, bearings (the other is the roller bearing). Its function is to connect two machine members that move relative to one another so that the frictional resistance to motion is minimal. In many applications, one of the members is a rotating shaft and the other a fixed housing. Each ball bearing has three main parts: two grooved, ringlike races and a number of balls. The balls fill the space between the two races and roll with negligible friction in the grooves. The balls may be loosely restrained and separated by means of a retainer or cage.
Learn More About BALL BEARING
Seen & Heard
What made you want to look up ball bearing? Please tell us where you read or heard it (including the quote, if possible).