Not Applicable.
The present invention relates to a solenoid, and more particularly to an electromechanical solenoid having an alignment member for alignment of two pole pieces between which an armature moves.
An electromechanical solenoid is a device that converts electrical energy into linear motion. Solenoids are used in a vast array of applications due to their utility. For example, solenoids are commonly used to control mechanical devices, including valves. In this application, the solenoid is typically mechanically coupled to the valve, either a pneumatic or hydraulic valve, and the solenoid is used to actuate the valve.
Referring to
A common arrangement for creating and maintaining alignment of components within a solenoid is through the use of a non-magnetic cup-like tube 44 as seen in
Referring to
Thus, maintaining alignment of pole pieces and reducing non-working air gaps becomes an important element in the improved operation of an electromechanical solenoid.
The disclosed invention reduces the losses in a solenoid magnetic circuit by eliminating non-working air gaps. An hour-glass shaped alignment member provides centering and alignment for a first pole piece and a second pole piece. With the first pole piece and the second pole piece properly aligned, a solenoid plunger is enabled to freely slide within bores of the first pole piece and the second pole piece, thereby eliminating the need for a cup-like armature sleeve used in previous solenoids, and avoiding non-working air gaps associated with the cup-like armature sleeve.
In accordance with an embodiment of the invention, an electromechanical solenoid comprises a solenoid assembly including a solenoid coil with a coil aperture formed therein. A pole piece assembly is positioned at least partially within the coil aperture, the pole piece assembly including a first pole piece and a second pole piece positioned at least partially within an alignment member. The first pole piece has a first bore and a first outer tapered surface extending away from the first bore, and the second pole piece has a second bore and a second outer tapered surface extending away from the second bore. An armature is moveable within the first bore and the second bore in response to a magnetic field produced by the solenoid coil.
In a preferred embodiment of the electromechanical solenoid, the solenoid actuator has a first pole piece with a tubular interior section that extends into one end of the coil aperture. A second pole piece has a tubular section that extends into another end of the coil aperture. The armature slides within the tubular interior section of the first pole piece and the tubular section second pole piece in response to a magnetic field produced by the solenoid coil. A housing, which encloses the first and second pole pieces and the coil, is secured to the valve body by crimped connection.
The foregoing and other aspects and advantages of the disclosure will appear from the following description. In the description, reference is made to the accompanying drawings which form a part hereof, and in which there is shown by way of illustration a preferred configuration of the disclosure. Such configuration does not necessarily represent the full scope of the disclosure, however, and reference is made therefore to the claims and herein for interpreting the scope of the disclosure.
The invention will be better understood and features, aspects and advantages other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such detailed description makes reference to the following drawings.
Referring to
Referring now to
In order to align the first pole piece 80 and the second pole piece 82, the outer tapered surface 92 of the first pole piece 80 and the outer tapered surface 102 of the second pole piece 82 are inserted into a similarly shaped alignment member 116. This arrangement allows the first pole piece 80 and the second pole piece 82 to generally face each other inside the alignment member 116. The open end 84 of the first pole piece 80 is spaced from the open end 94 of the second pole piece 82. A predefined space or gap 118 is created between the open end 84 of the first pole piece 80 and the open end 94 of the second pole piece 82 (see
An interior surface 122 of the alignment member 116 tapers inward from a first end 124 and a second end 126 to form a center portion 128, the alignment member 116 generally forming an hour glass shape. The second end 126 can have a flange 130 that projects outwardly from the second end 126. The center portion 128 has a center portion diameter 132 that is less than a diameter 134 at the first end 124 and the second end 126 (see
With reference to
The plunger 142 can further include a rolling bearing 154 integral with the armature 144. An axial force is applied to the plunger 142 by the magnetic flux at the first pole piece 80 and rolling bearing 154 helps to prevent binding of the armature 144 due to that axial force. The rolling bearing 154 can comprise a plurality of longitudinal slots 156 (five are shown) equidistantly spaced around the outer surface 158 of the armature 144. A separate chromium plated sphere 162 is located in each slot 156. Each sphere 162 projects from the respective slot into contact with the first pole piece 80 and are able to roll within the respective slot 156. Other forms and compositions of rollable elements, such as cylinders, may be used in place of the spheres 162.
Referring again to
The alignment member 116 can be sized so as to provide a predetermined interference on one or both of the first pole piece 80 and the second pole piece 82. The interference can create a constant force on one or both of the first pole piece 80 and the second pole piece 82 to push the first pole piece 80 against the actuator housing 62, and/or to push the second pole piece 82 against the disk 166. This constant force helps to maintain contact and alignment between the first pole piece 80, the second pole piece 82, and the alignment member 116, which in turn helps to reduce the air gap between these components for further improved magnetic efficiency.
Over mold 64 can be applied over at least a portion of the exterior surface of the housing 62. The over mold 64 can include one or more tabs 174. Each tab 174 can include an aperture 176 to allow the electromagnetic solenoid 60 to be secured to a device (not shown) to be operated. As previously described, solenoids are used in a vast array of applications due to their ability to convert electrical energy into linear motion. For example, solenoids are commonly used to control valves or other mechanical devices to control the flow of fluids.
Still referring to
In use, application of a predetermined amount of electric current applied to the solenoid coil 66 produces a movement of the armature 144 and tubular push member 106. When no electric current is applied to the solenoid coil 66, the armature 144 and tubular push member 106 are typically biased in a first position 180 (see
References herein to directional relationships and movement, such as upper and lower or up and down, refer to the relationship and movement of the components in the orientation illustrated in the drawings, which may not be the orientation of the components as attached to machinery.
Within this specification embodiments have been described in a way which enables a clear and concise specification to be written, but it is intended and will be appreciated that embodiments may be variously combined or separated without parting from the invention. For example, it will be appreciated that all preferred features described herein are applicable to all aspects of the invention described herein.
Thus, while the invention has been described in connection with particular embodiments and examples, the invention is not necessarily so limited, and that numerous other embodiments, examples, uses, modifications and departures from the embodiments, examples and uses are intended to be encompassed by the claims attached hereto. The entire disclosure of each patent and publication cited herein is incorporated by reference, as if each such patent or publication were individually incorporated by reference herein.
Various features and advantages of the invention are set forth in the following claims.
The present application is a continuation of U.S. patent application Ser. No. 14/284,595, filed on May 22, 2014, and entitled “Electromechanical Solenoid Having A Pole Piece Alignment Member.”
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Number | Date | Country | |
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Parent | 14284595 | May 2014 | US |
Child | 15491076 | US |