Rotary expansible chamber devices – Combined
Patent
1997-04-24
1999-10-05
Vrablik, John J.
Rotary expansible chamber devices
Combined
4182061, 417540, F04C 218, F04C 1500
Patent
active
059613092
ABSTRACT:
An apparatus comprises a reservoir (14) containing hydraulic fluid (68), a gear pump (16) with a suction hole (74), and a hydraulic muffler (18). The gear pump (16) has gears (78) with meshing teeth (80) that convey a flow of hydraulic fluid (68) from the reservoir (14) into the pump (16) through the suction hole (74). The muffler (18) attenuates noise by damping flow rate fluctuations that are caused by the meshing gear teeth (80). The muffler (18) includes a compliant element (92) and a fluid inertia structure (90) interposed between the suction hole (74) and the fluid (68) in the reservoir (14). The inertia structure (90) responds to the flow rate fluctuations by directing corresponding hydraulic pressure fluctuations to deflect the compliant element (92). As a result, noise is attenuated upon deflection of the compliant element (92).
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SAE Technical Paper Series, 801005 "New Methods of Reducing Noise in External Gear Pumps", Hobbs et al., 1980.
Harpole George M.
Mark Nelson P.
Petach Michael B.
TRW Inc.
Vrablik John J.
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