Supercharger and rotor and shaft arrangement therefor

Details Supercharger and rotor and shaft arrangement therefor Supercharger and rotor and shaft arrangement therefor

1988-01-19

1989-05-09

Vrablik, John J.

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

418206, 418270, 291564R, 29525, 403282, 403345, F04C 1818, F04C 2900, F16B 400, F16D 100

Patent

active

048284670

ABSTRACT:
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.

REFERENCES:
patent: 2372485 (1945-03-01), Griffin
patent: 3074292 (1963-01-01), Polmon
patent: 4269550 (1981-05-01), DiGiulio
patent: 4595349 (1986-06-01), Preston et al.
patent: 4747763 (1988-05-01), Sibata et al.

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