| 摘要 |
A Roots-type blower or supercharger (11) is provided of the type including a pair of meshed, lobed rotors (21) and (23) which are press-fit onto a pair of shafts (25) and (27), respectively. Each of the rotors includes a first bore portion (65), and a second bore portion (69), while the shaft defines a first shaft portion (67), press-fit into the first bore portion, and a second shaft portion (71), press-fit into the second bore portion. The shaft defines a close-clearance land (63), disposed forwardly of the first shaft portion. Disposed between the close-clearance land and the first shaft portion is an entrapment groove (75) which is sized so that it can contain all of the material sheared from the surface of the first bore portion (65) during the press-fit operation. The close-clearance land (63) cooperates with the first bore portion to define a close-clearance, able to retain the sheared material within the entrapment groove, and not permit it to pass forwardly, or be outside of the rotor/shaft subassembly.
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