| 摘要 |
<p>A shaft (S) rotates within a housing (H, J) on a double row tapered roller bearing (B, C) and remains extremely stable at all temperatures, even though the housing is formed from a light weight metal having a significantly greater coefficient of thermal expansion than the metal of the bearing. To this end, the housing contains a bore (16, 100) defined by a cylindrical surface (18, 102) and a conical surface (20, 104) which flares away from the cylindrical surface and opens out of one face of the housing. The bearing has two cones (30, 32) which surround the shaft, a unitary or double cup (34, 116) which fits into the bore of the housing, and tapered rollers (36) arranged in two rows between the cones and cup. The double cup on its exterior has a cylindrical surface (58, 118) which fits into the cylindrical surface of the housing bore and a flange (60, 120) provided with a beveled face (64, 124) which is against the conical surface of the housing bore. In addition, the cup has a threaded end (62, 122) which projects axially beyond the cylindrical surface of the cup engages a nut (66, 106) that is on the housing at the end of the cylindrical surface of the bore. The nut draws the beveled surface of the cup flange tightly against the conical surface of the housing bore. With an elevation in temperature, the housing expands axially and causes the flange to seat even more tightly against the conical surface of the housing, so that the cup remains firmly positioned, both radially and axially, in the housing, even though the cylindrical surface of the housing bore enlarges with respect to the cylindrical surface on the housing.</p> |
