Pumps – Motor driven – Electric or magnetic motor
Patent
1998-11-23
2000-12-12
Vrablik, John J.
Pumps
Motor driven
Electric or magnetic motor
418181, 4182061, 310 67R, F04B 1703, F04C 218, F04C 1300
Patent
active
061589837
ABSTRACT:
An apparatus (30) for use in pumping hydraulic fluid includes a pump unit (32) which is driven by an electric motor (34). The electric motor (34) is mounted on a tubular stem (108) which extends axially outward from a manifold plate (44). A stator (100) of the electric motor (34) is fixedly connected with the tubular stem (108). A rotor (112) of the electric motor (34) encloses the stator (100). A hydraulic muffler (50) attenuates noise produced by the gear pump unit (32). The hydraulic muffler (50) includes a channel (58) which extends into the manifold plate (44) from a major side surface (63) of the manifold plate. To increase the ability of the hydraulic muffler (50) to attenuate noise, one or two compliant elements (152 or 166 and 168) are connected with the channel (58).
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SAE Technical Paper Series, 801005 "New Methods of Reducing Noise in External Gear Pumps", Hobbs, et al., Sep. 1980.
Harpole George M.
Jones Michael A.
Petach Michael B.
Sangret Henry C.
TRW Inc.
Vrablik John J.
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