Solenoid valve combining a core and cartridge in a single piece
AssigneeG. W. Lisk Company, Inc.
InventorJeffery A. Tyler
Life of this patent
Estimating the term…
Abstract
A magnetic gap in a solenoid core is formed by a non-magnetic brazing material bonded into a groove encircling the core in the region of the magnetic gap. A bore through a single piece core and valve cartridge is dimensioned to intersect the brazing material and remove magnetic material bridging the gap without severing the core into separate pieces. This allows the solenoid core and the valve cartridge to be machined in a single piece with a uniform diameter bore receiving a single piece solenoid plunger and valve spool. This ensures accurate concentricity of the plunger and spool within the bore, which improves magnetic performance while reducing manufacturing costs.
Claims33
A solenoid operated spool valve comprising:
- a single piece valve cartridge and solenoid core formed generally of magnetic material;
- a non-magnetic bonding material bonded to the magnetic material in a configuration forming a magnetic gap;
- a working bore extending through the non-magnetic material in the magnetic gap to remove magnetic material from the magnetic gap and leave the magnetic material united in the original single piece by the bonding material;
- and
- the working bore receiving a solenoid plunger and valve spool having a uniform outside diameter with a sliding fit in the working bore.
A solenoid operated spool valve comprising:
- a single piece plunger and spool having a uniform outside diameter;
- a single piece solenoid core and valve cartridge with a working bore having a uniform inside diameter receiving the plunger and spool in an accurate sliding fit;
- the solenoid core and the valve cartridge being formed of magnetic material separated by a magnetic gap formed of non-magnetic brazing material;
- and
- the brazing material being bonded to the magnetic material on opposite sides of the magnetic gap to hold the magnetic material united along the length of the working bore.
A valve cartridge and solenoid core formed from a single piece of magnetic material by the steps of
- forming a groove extending radially inward around a region predefining a magnetic gap;
- configuring the groove as a pair of surfaces that intersect within the magnetic material;
- at least partially filling the groove with a non-magnetic brazing material that bonds to the surfaces of the groove in the shape of the magnetic gap;
- and
- dimensioning a bore extending through the magnetic gap so that the bore eliminates magnetic material bridging the magnetic gap and intersects the brazing material while leaving the valve cartridge and the solenoid core united by the brazing material.
A solenoid-operated spool valve, made by the method comprising:
- forming a valve cartridge and a solenoid core of a single piece of magnetic material;
- forming an outer groove encircling the solenoid core and extending radially into the magnetic material to predefine a magnetic gap;
- at least partially filling the groove with a non-magnetic bonding material that bonds to walls of the groove in the shape of the magnetic gap;
- dimensioning a bore extending at least part way through the cartridge and the core so that the bore intersects the groove and eliminates magnetic material bridging the magnetic gap while leaving the valve cartridge and the solenoid core united and held together by the bonding material forming the magnetic gap;
- and
- forming a solenoid plunger and a valve spool to slide accurately within the bore.
A solenoid operated spool valve comprising:
- a single piece plunger and spool having a uniform outside diameter;
- a single piece solenoid core and valve cartridge with a working bore having a uniform inside diameter receiving the plunger and spool in an accurate sliding fit;
- the solenoid core and the valve cartridge being formed of magnetic material separated by a magnetic gap formed of non-magnetic brazing material;
- opposite sides of the magnetic gap being configured as surfaces encircling and intersecting the working bore;
- and
- the brazing material being bonded to the surfaces to hold the magnetic material united on opposite sides of the magnetic gap.
Dependencies are inferred from the claim text.