Rotary pump and rotor-shaft subassembly for use therein

Details Rotary pump and rotor-shaft subassembly for use therein Rotary pump and rotor-shaft subassembly for use therein

1993-08-05

1994-06-14

Bertsch, Richard A.

Rotary expansible chamber devices

Interengaging rotating members

Like rotary members

298896, 2988972, 164516, F01C 118, F01C 124

Patent

active

053205081

ABSTRACT:
A rotor-shaft subassembly (33) is disclosed of the type for use in a Roots blower supercharger. The subassembly includes a rotor (39) mounted for rotation on a driveshaft (41) at forward (49,53) and rearward (57,51) axially spaced-apart locations. The rotor (39) is a cast member with each lobe thereof (61,63,65) defining a hollow chamber (71,73,75). The rotor includes a cylindrical web portion (67) disposed axially between the forward and rearward locations. Each lobe cooperates with the web portion to define a core opening (81,83,85) adapted to facilitate removal of a core from the hollow chamber after completion of the casting process. Each core opening provides open communication between its respective hollow chamber and the shaft bore, and each is disposed axially between the forward and rearward locations, so that after the rotor is press-fit on the shaft, there is no leak path of pressurized air into the hollow chambers.

REFERENCES:
patent: 4971536 (1990-11-01), Takeda et al.
patent: 5048368 (1991-09-01), Mrdjenovich et al.

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