Valves and valve actuation – Electrically actuated valve – Including solenoid
Reexamination Certificate
2002-08-05
2004-06-15
Bastianelli, John (Department: 3754)
Valves and valve actuation
Electrically actuated valve
Including solenoid
C251S129150
Reexamination Certificate
active
06749175
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a solenoid for a solenoid valve mounted to a solenoid valve for driving a channel-switching valve member.
PRIOR ART
A solenoid valve
50
previously proposed by the present applicant shown in
FIG. 4
comprises a valve portion
51
provided therein with a channel-switching valve member (not shown) and a solenoid portion
52
connected to the valve portion
51
for driving the valve member, and the valve member of the valve portion
51
is pushed by a push rod
60
and opened and closed.
The solenoid portion
52
is structured such that a cylindrical magnetic case
53
is provided at its one end with an opening to which the valve portion
51
is connected, a bobbin
55
having a coil
54
wound around an outer periphery of the bobbin
55
, a magnetic plate
59
mounted to an opened end of the magnetic case
53
, a stationary core
56
and a moving core
58
inserted into the magnetic plate
59
and the center hole of the bobbin
55
are assembled in the magnetic case
53
. The stationary core
56
includes a flange portion
56
a
, and a core
56
b
having a pole face
56
c
. The core
56
b
is inserted through center holes of the magnetic plate
59
and the bobbin
55
. The moving core
58
is slidably inserted into the center hole, one end of the moving core
58
is opposed to the pole face
56
c
, a cap
61
is press-fitted into the other end projecting from the center hole, the cap
61
is abutted against the push rod
60
, and a reference portion of the cap
61
is provided with an abutting portion
61
a
which moves toward and away from the magnetic plate
59
.
The cap
61
is provided at its outer periphery with a flange
61
b
, a return spring
57
is compressed between the flange
61
b
and the magnetic plate
59
, thereby always biasing the moving core
58
in an abutting direction against the push rod
60
, i.e., toward the valve portion
51
.
In the solenoid valve
50
having such a structure, if the coil
54
of the solenoid portion
52
is energized, the moving core
58
is adsorbed by the pole face
56
c
of the stationary core
56
as shown in right half of
FIG. 4
, an abutting portion
61
a
of the cap
61
abuts against the magnetic plate
59
and stops. On the other hand, in a non-energized state, the moving core
58
moves away from the pole face
56
c
by the biasing force of the return spring
57
toward the valve portion
51
as shown in left half of
FIG. 4
, thereby pushing the magnetic plate
59
, and associatively, the valve member is driven.
The solenoid portion
52
has the stationary core
56
of complicated shape comprising the flange portion
56
a
and the core
56
b
, but the present inventors made sure that it was unnecessary to especially provide such a stationary core having the complicated shape, and that sufficient magnetic attraction force could be exhibited to drive the moving core by a simple structure in which other member functions as the stationary core. If the solenoid portion is produced by this method, the number of parts can be reduced, the assembling process is simplified, and the producing cost can be reduced.
DISCLOSURE OF THE INVENTION
Thereupon, it is an object of the present invention to provide a solenoid for a solenoid valve capable of reducing the number of parts to simplify the assembling process and to reduce the producing cost by allowing other member to function as a stationary core.
To solve the achieve the above object, the present invention provides a solenoid for a solenoid valve mounted to a solenoid valve for driving a channel-switching valve member, wherein the solenoid comprises a non-magnetic bobbin having a center hole extending in a axial direction of the bobbin and wound around an outer periphery; a magnetic case having a side wall portion covering a side surface of the bobbin and an end wall portion integrally or separately formed on or from the side wall portion for covering one end surface of the bobbin in the axial direction and having substantially uniform thickness; an annular magnetic plate having a center hole coaxially connected to the center hole of the bobbin and connected to the magnetic case on the side of another end surface of the bobbin; and a moving core movably accommodated in the bobbin and the center hole of the magnetic plate; and wherein the end wall portion of the magnetic case also functions as a stationary core, a portion of the end wall portion covering the center hole of the bobbin is provided with a pole face for adsorbing the moving core.
In the present invention, the side wall portion and the end wall portion of the magnetic case may be integrally formed together, and they may have uniform thickness as a whole.
Alternatively, the side wall portion and the end wall portion of the magnetic case may be separately formed from each other and a thickness of the end wall portion may be greater than that of the side wall portion.
Further, an inner surface of the end wall portion of the magnetic case covering one end surface of the bobbin in the axial direction may be flat as a whole, or a portion of the end wall portion of the magnetic case covering the center hole of the bobbin may be provided with a cylindrical recess which is fitted into the center hole.
According to the solenoid of the present invention having the above structure, since a portion of the magnetic case also functions as the stationary core, it is unnecessary to provide a stationary core having the complicated shape unlike the prior art and thus, it is possible to drive the moving core by a stationary core having a simple structure. As a result, when the solenoid portion is produced, it is possible to reduce the number of parts, to simplify the assembling process, and to reduce the producing cost.
REFERENCES:
patent: 3004195 (1961-10-01), Peras
patent: 4339109 (1982-07-01), Kawata et al.
patent: 4896861 (1990-01-01), Kojima
patent: 4961561 (1990-10-01), Kamibayasi
patent: 5143345 (1992-09-01), Miki et al.
patent: 5746412 (1998-05-01), Niimi
patent: WO 93/11370 (1993-06-01), None
Aso Yoshio
Matsumoto Takumi
Sato Hideharu
Yoshimura Shin-ichi
Bastianelli John
SMC Corporation
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