Inductor devices – With core clamps – wedges or fasteners
Reexamination Certificate
1999-07-29
2002-03-26
Donovan, Lincoln (Department: 2832)
Inductor devices
With core clamps, wedges or fasteners
C336S083000, C336S098000, C335S220000
Reexamination Certificate
active
06362717
ABSTRACT:
BACKGROUND
An Anti-lock Brake System (ABS) is often included as standard equipment on new vehicles. When actuated, the ABS is operative to control the operation of some or all of the vehicle wheel brakes. A typical ABS includes a plurality of solenoid valves mounted within a control valve body and connected to the vehicle hydraulic brake system. Usually, a separate hydraulic source, such as a motor driven pump, is included in the ABS for reapplying hydraulic pressure to the controlled wheel brakes during an ABS braking cycle. The pump is typically included within the control valve body while the pump motor is mounted upon the exterior of the control valve body.
An ABS further includes an electronic control module, which has a microprocessor. The control module is electrically coupled to the pump motor, a plurality of solenoid coils associated with the solenoid valves and wheel speed sensors for monitoring the speed of the controlled wheels. The control module is typically mounted upon the control valve body to form a compact unit, which is often referred to as an ABS electro-hydraulic control unit.
During vehicle operation, the microprocessor in the ABS control module continuously receives speed signals from the wheel speed sensors. The microprocessor monitors the speed signals for potential wheel lock-up conditions. When the vehicle brakes are applied and the microprocessor senses an impending wheel lock-up condition, the microprocessor is operative to actuate the pump motor and selectively operate the solenoid valves in the control unit to cyclically relieve and reapply hydraulic pressure to the controlled wheel brakes. The hydraulic pressure applied to the controlled wheel brakes is adjusted by the operation of the solenoid valves to limit wheel slippage to a safe level while continuing to produce adequate brake torque to decelerate the vehicle as desired by the driver.
Referring now to
FIG. 1
, there is shown a sectional view of a typical ABS solenoid valve
10
mounted upon an ABS control valve body
11
. The valve
10
includes an axially shiftable armature
12
which is biased in an upward direction by a spring
13
such that a ball valve, generally represented by a reference numeral
14
, is maintained in a normally open position. The ball valve
14
cooperates with a valve seat member
15
which is mounted in the valve body
11
. The armature
12
is slidably disposed within a valve sleeve
16
having a closed end. A solenoid coil
20
is carried by the valve sleeve
16
and surrounds the armature
12
. The coil
20
is enclosed by a metal flux return casing
21
. An annular flux ring
22
is disposed within the open end of the flux casing
21
. The flux return casing
21
and flux ring
22
complete a magnetic flux path which passes through the armature
12
and the valve seat member
15
.
The solenoid coil
20
is of conventional design, comprising a winding
23
formed from multiple turns of an insulated magnet wire having a round cross-section, such as #28½ magnet wire. The coil wire is helically wound upon a plastic bobbin
24
. A pair of terminal pin supports
25
extend in an axial direction from the top of the bobbin
24
. Each of the supports
25
is molded over a terminal pin
26
. A lead wire
27
of the coil winding wire is wound around the base of each of the terminal pins
26
and soldered thereto. The pins
26
are electrically coupled to the ABS microprocessor.
When it is necessary to actuate the valve
10
during an anti-lock braking cycle, an electric current is supplied through the terminal pins
26
to the coil
20
. The current establishes a magnetic field in the armature
12
, which pulls the armature
12
in a downward direction, closing the ball valve
14
. When the current is interrupted, the magnetic field collapses, allowing the spring
13
to return the armature
12
to its original position, thereby reopening the ball valve
14
. An ABS control unit also typically includes other solenoid valves, such as normally closed solenoid valves (not shown), which have structures similar to the normally open valve
10
described above.
SUMMARY
The invention is directed to a coil assembly comprising a bobbin for supporting a coil. The bobbin supports a metal ferrule. A metal bracket is releasably coupled to the bobbin. The bracket holds the ferrule in place. The ferrule and the bracket are arranged to cooperatively serve as a return path for magnetic flux. The invention is also directed to a method for assembling a coil assembly.
Various objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.
REFERENCES:
patent: 3497845 (1970-02-01), Bernier
patent: 3730146 (1973-05-01), Moulds et al.
patent: 3859614 (1975-01-01), Reithmaier
patent: 4186363 (1980-01-01), Schmidt, Jr. et al.
patent: 4439751 (1984-03-01), Gibas
patent: 4728916 (1988-03-01), Fontecchio et al.
patent: 5198790 (1993-03-01), Elow
patent: 5533249 (1996-07-01), Wakeman
patent: 5601275 (1997-02-01), Hironaka
patent: 6065734 (2000-05-01), Tackett et al.
patent: 6086042 (2000-07-01), Scott et al.
patent: 6142445 (2000-11-01), Kawaguchi et al.
patent: 1515330 (1968-01-01), None
Donovan Lincoln
Kelsey-Hayes Company
MacMillan Sobanski & Todd LLC
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