<p>A hydraulic spool valve assembly includes a pair of lands spaced apart by a groove, one land comprising a piston face, an adjacent land comprising a hydraulic flow notch, wherein the piston face includes a pair of concentric radially concave concentric. The boundary between the two concave annuli defines a convex split point annulus. The notch is oriented so as to establish a hydraulic fluid flow adapted to impact the split point annulus so as to create inversely directed radial flows across the respective concave annuli. A reverse flow component is thereby established across the groove and back toward the notch to lessen the impact of the force of the hydraulic stream against the split point annulus.</p>
申请公布号
DE4040523(A1)
申请公布日期
1991.07.04
申请号
DE19904040523
申请日期
1990.12.18
申请人
DANA CORP., TOLEDO, OHIO, US
发明人
HENNESSY, DAVID R., MINNEAPOLIS, MINN., US;WENKER, DENNIS H., AFTON, MINN., US