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Exhaust gas recirculation valve

  • US 5,687,698 A
  • Filed: 08/29/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 08/29/1996
  • Status: Expired due to Term
First Claim
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1. A valve assembly for metering exhaust gas to the intake of an internal combustion engine comprising an electromagnetic solenoid actuator having a magnetic circuit including primary and secondary poles defining an axial chamber and an armature, associated with a valve member, and moveable in said chamber, said primary pole defined by a center pole member including a cylindrical inner wall, open at a first end for receiving said moveable armature, said armature and said cylindrical inner wall defining a fixed, radially extending primary air gap for flux passage thereacross, and an outer wall extending in an outward taper from said first, open end of said center pole member, said outwardly tapering wall operable to increase the mass of the pole piece through which said magnetic circuit operates as said armature moves from said first, open end of said pole towards a second end, said secondary pole defined by a center pole member including a cylindrical inner wall, open at a first end, for receiving said moveable armature, said first end located in spaced opposing relationship to said first, open end of said primary pole to define a pole-to-pole gap therebetween, said armature and said cylindrical inner wall defining a fixed, radially extending primary air gap for flux passage thereacross, and an outer wall extending in an outward taper from said first, open end of said center pole., said outwardly tapering walls of said primary and said secondary poles operable to minimize the pole-to-pole gap through a minimization in opposing surface area between said first end of said primary pole and said first end of said secondary pole to thereby maximize the length of said secondary pole and the surface area between said secondary pole member and said armature to thereby minimize the reluctance across said radial air gap and maximize the passage of flux through said armature.

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