| 摘要 |
A hydrostatic gear pump having a rotatable ring gear (50), a central sun gear (40), and plural planetary gears (44, 46, 48) engageable between the ring gear (50) and the sun gear (40). A two-part housing (80, 84) provides inlet fluid channels (68, 72) to the planet gears (44, 46, 48) and outlet fluid channels (58, 60) from the planet gears (44, 46, 48) so that each planet gear provides dual fluid transfer paths. Each planet gear fluid inlet (58, 60) is arranged oppositely, and each planet gear fluid outlet (58, 60) is arranged oppositely to thereby provide balanced forces on each planet gear (44, 46, 48) and reduce bearing wear.
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