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Glite Dictionary
journal box

journal box

9.6
A metal case that holds the bearing that helps a wheel turn on trains and machines
  • noun
  • /ˈdʒɜrnəl bɑks/
  • Specialized
translation icon : caja de cojinete
  • Proper lubrication of the journal box is essential to prevent overheating of the bearing.

Examples

  • The mechanic inspected the journal box for signs of excessive wear and replaced the damaged parts.

  • The old locomotive suffered a failure after the journal box ran dry.

  • The journal box needs to be replaced soon.

  • Can you check the journal box for any damage?

  • The mechanic inspected the journal box for signs of excessive wear and replaced the damaged parts.

  • Proper lubrication of the journal box is essential to prevent overheating of the bearing.

  • The old locomotive suffered a failure after the journal box ran dry.

How Protective

journal box
  • Specialized
9.6
bearing
  • Specialized
20 6.4

Surface Forms

journal box singular
journal boxes plural

Morphology

journal + box

The compound is transparently compositional: 'journal' (the rotating shaft portion in a bearing) + 'box' (a housing or container) directly yields a housing that contains/supports the journal. Although the terms are technical and may be infrequent, a learner who knows both constituent meanings can predict the MWE's meaning without prior exposure.

Etymology

Journal box comes from the picture of the turning part of an axle—the journal—sitting inside a protective box. So, it means the metal case that holds and supports the 'turning part' of a machine.