Ball bearings are small metal balls placed between the moving parts of a machine to make the parts move smoothly.
ball bearing in British English
noun
1.
a bearing consisting of a number of hard steel balls rolling between a metal sleeve fitted over the rotating shaft and an outer sleeve held in the bearing housing, so reducing friction between moving parts while providing support for the shaft
2.
a metal ball, esp one used in such a bearing
ball bearing in American English
1.
a bearing in which the moving parts revolve or slide on freely rolling metal balls so that friction is reduced
2.
any of such metal balls
ball bearing in Mechanical Engineering
(bɔl bɛərɪŋ)
Word forms: (regular plural) ball bearings
noun
(Mechanical engineering: Machinery and components)
A ball bearing is a bearing containing hard steel balls.
Ball bearings are made of small steel balls and are used in bicycles to make the wheels and steeringmove more smoothly.
The steel balls act as ball bearings so that the action is smoother than just one gear turning against another.
A ball bearing is a bearing containing hard steel balls.