The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 1993
Filed:
Apr. 06, 1992
Andrew H Nippert, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
An assembly is provided for use in a solenoid having an energizable coil. The apparatus includes a ferromagnetic main body member adapted to be received in the coil. An armature chamber having a constant diameter is disposed in the main body member. A radially externally facing taper is formed in the outer surface of the main body member. The taper extends between the armature chamber and the outer surface of the main body member. A stationary pole piece and an end plug respectively define a first and second end of the armature chamber. An armature member is positioned in the armature chamber for axial sliding movement relative to and defining a working gap relative to the pole piece. The armature includes a fluid passage adapted to provide nonlaminar fluid flow. A nonferromagnetic sleeve is positioned on and fixedly connected to the main body member. The sleeve is linearly coextensive with the externally facing taper and at least a portion of the working gap sufficient to permit selected magnetic forces to be exerted on the armature member. A junction of the sleeve and the externally facing taper define an air gap which extends from the externally facing taper to an internal radial surface. The stationary pole piece and the main body member are manufactured from a single piece of ferromagnetic material and the armature chamber is formed subsequent to fixing the sleeve to the main body member.