axle box

Century Dictionary and Cyclopedia

1. n. The box which contains the bearings for the spindle of an axle, or the journal of an axle, as of a carriage-wheel, a railroad-car wheel, etc.; the bushing or metal lining of the hub which forms the rotatory bearing of the axle of a vehicle.

Wiktionary

1. n. A bushing in the hub of a wheel, through which the axle passes.
2. n. The journal box of a rotating axle, especially a railway axle.

GNU Webster's 1913

1. A bushing in the hub of a wheel, through which the axle passes.
2. The journal box of a rotating axle, especially a railway axle.