| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024ˈball ˈbear•ing, n. [countable]- Mechanical Engineeringa small hard ball placed in a groove between two moving parts of a machine to allow the parts to move smoothly.
WordReference Random House Unabridged Dictionary of American English © 2024ball′ bear′ing, [Mach.]- Mechanical Engineeringa bearing consisting of a number of hard balls running in grooves in the surfaces of two concentric rings, one of which is mounted on a rotating or oscillating shaft or the like.
- Mechanical Engineeringany of the balls so used.
ball′-bear′ing, adj. Collins Concise English Dictionary © HarperCollins Publishers:: ball bearing n - 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
- a metal ball, esp one used in such a bearing
|