Coil assembly useful in solenoid valves
First Claim
1. A coil assembly for a solenoid, comprising a coil having a hollow core;
- a metallic, non-magnetic housing surrounding the coil, the housing having end plate portions with openings therethrough aligned with the core;
a fitting disposed at one end of the housing, the fitting having a bore therethrough aligned with the hollow core and having an outwardly extending radial shoulder facing away from the housing;
a metallic non-magnetic flux tube of a selected internal diameter having a first end with a radially extending shoulder for engaging one end of one of said plate portions of the housing and a second end formed into an outwardly extending flange for engaging the outwardly extending shoulder of the fitting.
3 Assignments
0 Petitions
Accused Products
Abstract
A coil assembly for miniature solenoid valves, such as size SAE-6 valves, includes a flux tube which passes through the hollow core of the coil assembly. The flux tube is formed against a shoulder of a coupling member by using the "Tammel" orbital head forming technique in which a forming tube orbits around the end of the flux tube to form a flange which bears against the shoulder. A flux washer is disposed adjacent the coil and is held tightly thereagainst by the flux tube to help linearize magnetic force exerted upon energizing the coil. In order to facilitate stroking and destroking the solenoid valve, the tank ports close slightly before the pressure ports are opened when stroking and slightly after when destroking. The coil is designed to saturate the magnetic circuit early to diminish the effect of coil heating and resultant force loss at a given stroke displacement.
42 Citations
22 Claims
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1. A coil assembly for a solenoid, comprising a coil having a hollow core;
- a metallic, non-magnetic housing surrounding the coil, the housing having end plate portions with openings therethrough aligned with the core;
a fitting disposed at one end of the housing, the fitting having a bore therethrough aligned with the hollow core and having an outwardly extending radial shoulder facing away from the housing; a metallic non-magnetic flux tube of a selected internal diameter having a first end with a radially extending shoulder for engaging one end of one of said plate portions of the housing and a second end formed into an outwardly extending flange for engaging the outwardly extending shoulder of the fitting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a metallic, non-magnetic housing surrounding the coil, the housing having end plate portions with openings therethrough aligned with the core;
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11. A solenoid assembly comprising:
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a coil defining a hollow core and having a first end and a second end; a housing surrounding the coil, the housing having an axially extending wall positioned around the coil;
a first end wall over the first end of the coil, the first end wall having an opening therethrough, and a second end;a fitting disposed adjacent the second end, the fitting including a radial surface facing away from the housing; a flux tube of non-magnetic material extending through the coil, the flux tube having a radially extending portion associated therewith at a first end thereof and a flange at a second end thereof, the radially extending portion having a diameter greater than that of the opening through the first end of the housing and the flange being riveted into engagement with the radial surface of the fitting to hold the fitting to the housing; an armature mounted within the flux tube for axial movement therein; and a pole piece fixed within the flux tube for executing a magnetic force on the armature to move the armature in a first direction. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification