Hydraulic valve for an internal combustion engine

摘要

In a hydraulic valve comprising a spool, one or more band-shape check valves and an enclosing bolt or snout, the check valve may be compressed to the point of excessive wear or failure and may impede spool movement. The problem outlined is solved by an inventive hydraulic valve for use with a cam phasing apparatus of an internal combustion engine. The hydraulic valve comprises a hollow bolt or snout, check valves, and a spool disposed inside the bolt while still being able to shift axially within the bolt. The bolt and spool are configured to provide fluid passageways between the spool and the cam phasing apparatus depending on a translational displacement of the spool. Furthermore, the spool is configured to allow an oil flow through the fluid passageway, yet limit a compression of the band-type check valves.

主权项

1. A hydraulic valve for use with a cam phasing apparatus of an internal combustion engine, comprising: a bolt having a surface which provides a plurality of fluid ports; a spool disposed inside the bolt, said spool having two ends, and said spool configured to shift axially within the bolt and a plurality of band-shape check valves spaced apart from the ends of the spool and disposed radially between the spool and the bolt, wherein the bolt, the spool, and the band-shape check valves are configured to provide a fluid passageway between the spool and the cam phasing apparatus depending on a translational displacement of the spool, wherein the spool is further configured to limit compression of the band-type check valves when the band-type check valves open to allow flow into the bolt.