US 5,208,570 A · Solenoid construction and method for making same

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.

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Drawings

Claims14

Dependent claims

An assembly for use in a solenoid having an energizable coil, comprising:

a hollow solenoid armature tube adapted to be received in the coil, the armature tube having an armature chamber therein;
a stationary pole piece member defining a first end of the armature chamber;
an end plug defining a second end of the armature chamber;
and
an armature member having an orifice and a longitudinal bore which are fluidly connected and adapted to provide nonlaminer fluid flow through the armature, the longitudinal bore having a diameter at least three times larger than the diameter of the orifice, and the armature member being positioned in the armature chamber for axial sliding movement relative to and defining a working gap relative to the pole piece.

2 more elements

An assembly for use in a solenoid having an energizable coil, comprising:

a ferromagnetic main body member adapted to be received in the coil, the main body member including first and second body portions and having an armature chamber of a constant diameter disposed therein;
a radially externally facing taper formed in the outer surface of the main body member, the taper extending between the armature chamber and the outer surface of the main body member;
a stationary pole piece disposed in the first body portion and defining a first end of the armature chamber;
an end plug disposed in the second body portion and defining a second end of the armature chamber;
an armature member positioned in the armature chamber for axial sliding movement relative to and defining a working gap relative to the pole piece;
a nonferromagnetic cylindrical sleeve positioned on and being fixedly connected to the main body member, the sleeve being 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 defining an air gap which extends from the externally facing taper to an internal radial surface of the second body portion;
and
wherein the stationary pole piece, the main body member and the first and second body portions 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.

5 more elements

Dependencies are inferred from the claim text.

Description5,480 words

Summary1,050 words

#1. Technical Field

#This invention relates to solenoids and methods for making the same and in particular proportional type solenoids.

#2. Background Art

Brief description of the drawings4 figures

#FIGS. 1 and 2 are cross-sectional views of typical prior art proportional solenoids;

#FIGS. 3 and 4 are cross-sectional views of an embodiment of the present invention;

#FIGS. 5 and 6 are cross sectional views of the present invention employing a second embodiment of the preferred fluid passage; and

Detailed description4,359 words

#In a first aspect of the present invention an assembly is provided for use in a solenoid having an energizable coil. The apparatus includes a hollow solenoid armature tube adapted to be received in the coil. An armature chamber is disposed in the armature tube. A stationary pole piece member defines a first end of the armature chamber and an end plug defines a second end of the armature chamber. The assembly further includes an armature member having a fluid passage adapted to provide nonlaminar fluid flow. The armature member is positioned in the armature chamber for axial sliding movement relative to and defining a working gap relative to the pole piece.

#In a second aspect of the present invention, 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 of a constant diameter 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 defines a first end of the armature chamber and an end plug defines a 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. 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 defining an air gap which extends from the externally facing taper to an internal radial surface of the second body portion. 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.

#The preferred embodiment of the present invention is illustrated in FIGS. 3 and 4. The construction of the present invention is readily adaptable to proportional solenoids such as those used to operate hydraulic valves. Also, this invention is readily adaptable to push-pull solenoids, as would be apparent to one skilled in the art.

Facts

Application

07/864,248Filed 6 Apr 1992

Granted

4 May 1993

Term ended

6 Apr 2012

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification6 codes

H01F 41/0206
For manufacturing cores, coils, or magnets: manufacturing of magnetic cores by mechanical means
H01F 7/088
With armatures: provided with means for absorbing shocks
H01F 7/1607
Rectilinearly-movable armatures: armatures entering the winding
H01F 7/165
Rectilinearly-movable armatures: means for guiding the movement of the armature with reduced friction, e.g. bearing or coating

Solenoid construction and method for making same

Life of this patent

Solenoid construction and method for making same

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims14

Description5,480 words

Drawings

Classification6 codes

Life of this patent

Description5,480 words