Note: Descriptions are shown in the official language in which they were submitted.
~3Z8~1
--1--
The present invention relates to an electromagnet
tically-controlled valve, suitable for controlling an add-
tonal air flow in a feed equipment for an internal combs-
lion engine.
The present invention permits the controlling
of an additional air flow for intervening opportunely on
the amount of the mixture delivered by a feed equipment
of an internal combustion engine. In particular, the present
invention is referred to a valve of the above mentioned
type which controls a connect pipe between two zones of
an intake passage. These zones are placed up-and downstream
of the throttle valve respectively, in order to obtain an
additional air flow determined according to the requirements
of the engine working.
Devices, which control an additional air flow
between the parts of the feed equipment, which are placed
on the up and downstream of the throttle valve, are known.
Their structure presents a by-pass channel interconnecting
the intake passage located upstream of the throttle valve
to the intake passage located downstream of the throttle
valve; in the bypass channel there is a device to control
the air flow, like a fixed section bush or an adjustable
section bush by the conic drill of an adjusting screw.
In such devices it is impossible to vary the
controlling bush section during the engine working in order
to adapt the additional air flow to the working requirements
of the engine itself.
This invention has its object to overcome the
above drawback.
According to the present invention, there is
provided an electromagnetically controlled valve for control-
lying additional air flow delivered by a feed equipment also-
elated with an internal combustion engine;
said equipment comprising at least an intake
.,
~L2~2801
--2--
passage having a throttle valve;
said electromagnetically controlled valve compare-
sing:
an air inlet connected with a first part of said
intake passage, said air inlet being positioned upstream
of a throttle valve;
an air outlet connected with a second part of
the intake passage, said air outlet being positioned downs-
treat of the throttle valve;
a hollow tubular element connected to said air
inlet and having primary connecting orifices between said
air inlet and said air outlet;
a movable obturator housed within said tubular
element, said movable obturator comprising a bushing of
non magnetic material and a magnetic keeper housed within
said bushing, said obturator being slid able within said
tubular element;
first and second stopping means for stopping
movements of said obturator at limit positions within said
0 tubular element;
said first stopping means being defined by a
ring inserted in a groove made in a pin coaxial with said
tubular element;
said second stopping means being defined by a
5 shoulder of a casing for a winding;
a magnetic field generating means for generating
a magnetic field to move said obturator between said limit
positions, said generating means including a core disposed
in said casing for said winding;
a return spring means for biasing said obturator
against the forces generated by said magnetic field;
said core including a first support for said
spring means;
said support being located in said core;
1232~
-pa-
said bushing including a second support for said
spring means, said second support being disposed in said
bushing;
said bushing including secondary orifices to
connect said air inlet with an internal part of said tubular
element; and
said obturator including a conical edge positioned
to selectively open said primary connecting orifices respond
size to energization of said winding to obtain luminary
air flow across said primary connecting orifices, said
luminary air flow being directly proportional to an air
passage section provided by said primary connecting orifices,
depending on the position of said obturator.
According to the present invention, there is
also provided an electromagnetically controlled valve for
controlling additional air flow delivered by a feed equip-
mint associated with an internal combustion engine
sets equipment comprising at least an intake
passage having a throttle valve:
said electromagnetically controlled valve compare-
sing:
an air inlet for air coming from a first part
of the intake passage, said first part being positioned
upstream of the throttle valve;
an air outlet for air moving toward a second
part of the intake passage, said second part being position
nod downstream of the throttle valve;
a hollow tubular element connected to said air
inlet and having primary connecting orifices between said
air inlet and said air outlet
a movable obturator housed within said tubular
element
first and second stopping means for stopping
movement of said obturator at limit positions within said
~L23Z8Q~L
-2b-
obturator at limit positions within said tubular element
a magnetic field generating means for generating
a magnetic field to move said obturator between said limit
positions, said generating means including a core disposed
in a winding energizable by electrical control means;
a return spring means for biasing said obturator
against the forces generated by said magnetic field;
said obturator including a movable keeper made
of ferromagnetic material disposed in a bushing of non-
magnetic material both for sliding within said tubular eye-
mint;
said bushing including a second support for said
spring, said second support being disposed in said bushing;
said bushing including secondary orifices to
connect said air inlet with an internal part of said tubular
element;
said obturator including a conical edge positioned
to selectively open said primary connecting orifices respond
size to energization of said winding to obtain luminary air
flow across said primary connecting orifices, said luminary
air flow being directly proportional -to an air passage sea-
lion provided by said primary connecting orifices; and
said second stopping means comprising an elastic
ring disposed in a groove of a pin integral with said magnet
tic core, said ring being disposed on an opposite side offside bushing from a side of said bushing on which said spring
is disposed.
Preferably, the bushing is formed of aluminum.
, The advantages obtained, thanks to this invention,
are essentially: the capacity to control the additional
air flow while the engine is working; to avoid that the difference
between the pressure existing in the rooms connected by
this valve creates appreciable forces to win; and the fact
that the valve obturator is an integral part of the magnetic
1232~
-2c-
circuit, as in it the moving ferromagnetic element is drown
nod. This ferromagnetic element is attracted by the fixed
element against the action of a contrast spring.
Such a structure lends itself to karat number-
less balance positions of the obturator in respect to the fixed openings to obtain passage sections having the required
area, intervening on the pick up current value of the magnet
tic winding.
A preferred embodiment will now be described
as example without limitative manner with reference to the
attached drawings, wherein:
Figure 1: the single Figure represents a valve
according to the present invention, shown in section by
3 123280~
symmetry plane.
The valve shown in fig. l is located in a pipe which joints
a first orifice to a second one, made in an intake passage
of an internal combustion engine, respectively on the up
65 stream arid downstream of the throttle valve; the above mention
nod devices are not represented, as well known in the motor
technic field.
This valve presents a body globally indicated with 8, pro-
voided with an inlet 7 for the above mentioned pipe and
70 connected to the first orifice through a by-pass channel 1.
The above mentioned inlet 7 is situated at the top of a tutu-
far element 9, an integral part of the body 8; in the eye-
mint 9 there are two orifices lo and lob diametrically oppo-
sod and suitable to connect the internal part of said tubular
75 element 9 with a chamber 11 defined by the external surface
of said element 9 and by the internal surface of a sleeve
12 winch joints the pipe which is not represented in body
8 and which is jointed to the second orifice not represented,
by a pass-channel 2. in this way it has been made an air
80 connection between the orifice on the upstream and the one
on the downstream of the throttle, in said connection the
above mentioned body 8 being inserted to control the air flow
varying the passage section of said orifices lo and lob
85 For this last purpose, the above mentioned body 8 includes,
in addition to the sleeve 12 and to well known means neither
described nor represented, for its stable positioning with
respect to the intake passage, a magnetic winding 15 which
- receives current from a not represented electrical control
90 unit, a core 16 of low magnetic hysteresis material, and a mow
4 1232~30~
bile keeper 17 made of low magnetic hysteresis material which
is moved by the magnetic field generated by the above men-
- toned energized winding 15, against the action of a contrast
spring 18, which is placed between the above said core 16
95 and the said keeper 17. The latter is part of a mobile
obturator , made up of a bush 20 of non-magnetic material,
which is able to move inside the above said element 9; the
said bush 20 has: a housing for the keeper wish is in-
tegral part of the interior of obturator 19; an upper part
100 21 with a central orifice 22 and four eccentric orifices, of
which orifices aye and 23c are shown in fig. 1 and connect
the said inlet 7 with a cavity 29 inside body 8; on the
upper part of said bush 20 there is a frustum of cone-shaped
cavity 24, suitable to form a sharp edge on its top.
105
Central orifice 22 is crossed by a pin 26 jointed to core 16,
and the said` pin presents a groove 27 to lodge a ring 28
that carries out the upper end stroke for the obturator 19,
as the lower stroke end is made up of a shoulder 30 of a
110 container 31 of the said winding 15.
This special structure enables us to obtain the following:
a) a balance between pressures in inlet 7 and cavity 29,
so that the obturator is not subject to axial thrusts due
115 to pressure forces on the two surfaces with equivalent areas,
placed in front of the inlet 7 and cavity 29 respectively;
b) the control of the magnetic adhesive force of the keeper
17, thanks to the presence of the non-magnetic material with
a defined thickness furlong the bush 20;
120 the positioning of the edge 24 with respect to the openings
5 ~Z32~
lo and lob by controlling the intensity of current that
picks winding 15 up; such positioning varies the sections
of the air flow passage from the inlet 7 to the chamber 11
and in this way it regulates the flow according to the work-
125 in requirements of the engine being perceived and worked out by the above mentioned electrical control unit;
d ) lamination of the air flow due to the sharp edge 24 at
the end of part 21 finally makes it possible to adjust the
additional air flow to the uncovered opening and the differ
130 fence in pressure between the upstream and downstream of the obturator. This is lust one of the possible employments
of this invention, whose peculiarity cannot be altered by
the manufacture changes that can be made; shapes, size
and used materials do not limit the scope of this invention,
135 in which every single component can be replaced by an
equivalent one.
