| 摘要 |
A hydraulic pump having a pump body formed by stacked plates mounted end-to-end. First and second ports for delivery and return of hydraulic fluid are formed through a port plate that is surmounted by a valve plate through which first and second main valve passages, each aligned with the first and second ports respectively, are formed. The valve plate is surmounted by a manifold plate in which first and second fluid distribution chambers, fluidly communicated with the first and second main valve passages respectively, are formed. A pump plate atop the manifold plate contains a gear assembly in a pumping chamber formed in the ends of the pump and manifold plates that draws fluid from one fluid distribution chamber and discharges it to the other. Each main valve passage contains a main pump valve that is biased for movement toward a sealing position that blocks fluid flow from through the main valve passage and each main pump valve is engaged by pistons in piston chambers that intersect the main valve passage in which the valve is disposed and opens to the fluid distribution chamber communicated with the other main valve passage.
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