Sleeve for rotary valve
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United States of America Patent
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-
Dec 7, 1999
Issued Date -
N/A
app pub date -
Dec 9, 1998
filing date -
May 5, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A rotary valve of a hydraulic power steering gear includes an input-shaft journalled within a sleeve. In the bore of the sleeve, an array of eight axially extending blind-ended slots and an array of two primary and two secondary axially extending return channels are formed. The primary return channels are diametrically opposed, and the secondary return channels are diametrically opposed. The return channels extend to at least one axial extremity of the bore to communicate hydraulic fluid to a return port. Further, the radial depth of the secondary return channels is substantially less than the radial depth of the primary return channels at or near the axial extremity.
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