| 摘要 |
A rotary blower (26) of the Roots type, used as an engine supercharger, comprising a housing (50,52) including a forward wall portion (52F) defining an inlet port (30) disposed toward the upper portion of the housing. Typically, the housing defines an outlet port (34) on the underside (54) of the blower. Disposed within the housing is a pair of meshed, lobed rotors (28,29), with one of the rotors being driven by an input shaft (62). The blower includes a pair of timing gears (58,60) disposed adjacent the rearward end (52R) of the housing. The housing includes an inlet duct (32) disposed above the input shaft (62) and extending forwardly and transversely (FIG. 2) from the housing, and having a duct opening (70) in open communication with the inlet port (30). The arrangement of the invention provides substantially improved air flow efficiency through the blower, which corresponds to improved horsepower output of the engine on which the rotary blower is being used.
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