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Патент USA US2412102

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Dec. 3, 1946.
w. J. SPE_NGLER
2,412,102
IGNITION APPARATUS
Filed June 12, 1943
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BY
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ATTORNEY
Patented Dec. 3, 1946
2,412,102
UNITED STATES PATENT OFFICE
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2,412,102
IGNITION APPARATUS
Walter J. Spengler, Sidney, N. Y., assignor to
Bendix Aviation Corporation, New York, N. Y.,
a corporation of Delaware
Application June 12, 1943, Serial No. 490,667
12 Claims. (01. 175—361)
1
This invention relates to electrical apparatus
and more particularly to means for transforming
voltages for ?ring the spark plugs in an ignition
i;...1
.
2
broken away, the section being taken substan
tially on line 4-4 of Fig. 2.
A single embodiment of the present invention
is illustrated in the accompanying drawing, by
system of an internal combustion engine.
One of the objects of the present invention is ; 6:1 way of example, in the form of a nest of four
to provide a novel and advantageous means for
transformer coils [0, which is particularly adapt
housing and mounting a plurality of spark coils of
ed for use on a double row radial engine having
an ignition system.
Another object of the invention is to provide
a simpli?ed arrangement of a plurality of trans
former coils in an ignition system wherein the
current is distributed at primary or generated
voltage and stepped up at coils mounted near
the spark plugs.
A further object is to provide a structure em- -
bodying a novel arrangement of the above char
dual ignition, As illustrated, each of the four
coils are identical, and hence interchangeable,
thereby minimizing manufacturing and installa
tion costs and problems and facilitating replace
ments when necessary.
Each of said coils con
sists of the usual primary and secondary wind
ings wound on a metallic core ll, said windings
being enclosed in a cylindrical casing ‘[2 of in
sulating material.v Each of the cores H con
acter which is sturdy and reliable and whereby
a substantial saving of space and weight is real
ized without sacri?cing any advantages of struc
sists of a plurality of rectangular laminations,
each having an arm 13 extending through the
tures heretofore provided for the same purpose.
Another object is to provide apparatus of the
13 at the periphery of the coil and two radially
extending arms I5 and i6 at the ends of the coils
connecting the ends of arms 13 and I4.
above character whereby the radio-shielding re
quired for the entire ignition system is reduced
to a minimum, thereby materially reducing the
possibility of failures.
Still another object is to ‘provide apparatus of
the above character which is so constructed that
coil, a similar arm l4 extending parallel to arm
Coils ID with their input and output terminals,
to be hereafter described. are preferably enclosed
and, hence, radio-shielded by a two-part metallic
housing consisting of a substantially cylindrical
main casing member H and a cover l8.
The
the operation thereof will not be a?ected by
closed end or bottom IQ of easing member I‘l'is
rare?ed atmosphere and low pressures at high
provided on its inner face with a groove or recess
altitudes.
30 20 in the form of a cross (Fig. 3) for receiving
The above and further objects and novel fea
the positioning arms’ 85 of'the coil cores, said
tures of the invention will more fully appear
cores being arranged'with the exposed arms I4
from the following detailed description when the
thereof adjacent one another at the center of
same is read in connection with the accompany
easing
I1.
'
7
ing drawing. It is to be expressly understood, 35 At any convenient position at the closed end
however, that the drawing is for the purpose of
59 of easing member [1. an opening 2| is pro
illustration only and is not intended to de?ne
vided for incoming conductors from a source of
the limits of the invention, reference for this
current which feeds the primary windings of
latter purpose being primarily had to the ap
coils iii. A multiple socket 22 of a plug and
pended claims.
40 socket connection, which may be of any suitable
In the drawing, wherein like reference char
type, such as those known as “Cannon” plugs,
acters refer to like parts throughout the several
is mounted in opening 2! and each of the socket
views,
conductors 23 is connected by an insulated lead
Fig. 1 is a side elevation view mostly in section
‘M to the primary winding of a coil l0. As seen
and with parts broken away showing one form of 45 in Fig. l, the thickness of- core arms I5 is greater
than the depth of recess 2!] by a suf?cient amount
structure embodying the features of the present
invention, the section being taken substantially
on line l--| of Fig. 2;
Fig. 2 is a top plan view of the structure shown
in, Fig. 1 with the cover and ?lling material
removed;
.
Fig. 3 is a detail plan view, partly in section,
showing the main casing of the structure of Fig.
to permit conductors 24 to pass between bottom
closure is and the lower ends of coils IS. The
plug of the detachable» connector may be remov
ably held in place by a nut which engages the
threaded portion 25 of socket 22 in a manner
well understood in the art.
’
Cover I 8 is preferably provided with a depend
2; and,
ing annular ?ange 26 which closely surrounds the
Fig. 4 is a detail sectional view with parts 55 upper edge of easing [1. Any suitable means,
2,412,102
3
4
such as screws 21, may be provided for securing
the cover to casing member If. Screws 2'! may
engage threaded openings 28 tapped into bosses
29 on the interior of said casing member (Fig. 2).
been found satisfactory for this purpose. The
?lling material is preferably injected with the
The inner face of cover I8 is provided with a
5 agent, such as paraformaldehyde or the like,
groove 30 similar to and. directly opposite groove
.20 for receiving and positioning arms I6 of coil
aid of vacuum or pressure while in the form of
a viscous liquid. A suitably drying or setting
may be mixed with the liquid polymers to facili
tate setting thereof throughout without the aid
cores II. The core and coil assemblies I?, II
of oxygen. Heat may be applied to facilitate the
are thus ?rmly held in predetermined positions
setting action. It is preferable that the ?lling
in casing I'I, I8. If desired, a spacer 3I of wood 10 material used be of such a nature that it will
or other suitable material may be inserted be
set to a yieldable but non-moldable solid form
tween arms Id of coil cores II at the center of
which will permit removal of the coils and ?lling
casing member I‘I. Cover I8 is also provided
material from the casing without damage to the
with four symmetrically-spaced, externally- ‘
coils when disassembly of the unit is necessitated.
threaded nipples 32 for a purpose to appear here-~ 15 During the ?lling operation, socket tubes 3'! above
inafter, said nipples being disposed directly above
terminals 159 may be substantially ?lled with a
and concentric with four circular recesses 33 in
suitable plug. to prevent the compound from
bottom I9 of easing member [1.
?lling the well which is intended for the con
Before cover I8 is placed in position, suitable
nector plug. Many types of suitable connector
sockets with terminals connected to the output 20 plugs are well-known in the art and in common
ends of the secondary windings 34 of coils Ill and
use today. The ?lling material may be injected
adapted to receive detachable plug connectors
through a ?lling hole 49 while air or other gases
are installed in casing member I‘! and the con
are permitted to escape through a bleed port 58.
nected ends of the primary and secondary wind
To further provide against the possibility of
ings of each coil are connected to ground by 25 ?ashovers within casing Ii, IS, a piece of var
means of insulated leads 35 which are conduc
nished cambric M or like insulating material
tively attached to casing I‘! by any suitable
may be passed between each coil and arm I4
means, such as screws 36. Each of the sockets
of the core thereof and extend between the ter
for a high tension or output terminal comprises '
minal socket 3‘! attached to‘ said coil and the
a rigid insulating tube‘ 37, the upper end of which 30 casing of an adjacent coil (Fig. 2). This pro
has a close sliding ?t in a nipple 32 of cover IS.
vides insurance against ?ashovers from the high
The lower end of each tube 31 rests upon a block
tension terminals and particularly brackets 44
38 of suitable insulating material, which is, in
to the cores II of the coils.
turn, positioned in the bottom of casing member
Casing member I‘! is preferably provided with
I 1' by a recess 33 or held in place by means of 35 an external flange‘ 52 which, together with the
glue or the like for assembly purposes.
extending portion 26 of cover I8, forms an ex
Resting on an’ internal shoulder 39 interme
ternal channel to receive suitable means for
diate the ends of tube 31 is a fabricated terminal
mounting the coil unit on an engine. The
40 which comprises a washer or plate M engaging
mounting means preferably comprise some suit
said shoulder and a depending coil spring 42.
able yieldable material so that all the vibrations
The lower hooked end 43 of said spring oper
and shocks of the engine will not be transmitted
atively engages a rigid metallic bracket 44, which
to the coil unit. The novel coil unit disclosed is
is secured to the wall of coil casing I2 (Fig. 4)
particularly adapted to be mounted between two
and is electrically connected to the high voltage
adjacent cylinders in the front row‘ of a double
en'd'of secondary Winding 34 of the coil. The 45 row radial engine so that it may serve four
laterally extending portion of bracket 44 to which
spark plugs located near it, such as the spark
spring 42 is hooked extends through a groove
plugs in one rear row cylinder and one front
or slot 45 in the'lower end of socket tube 3'!
row cylinder of a double row, radial engine.
and, hence, serves‘ to limit the angular move
Only a relatively short shielded lead 48 between
ment of the tube about its longitudinal axis. 50 each of the terminals 48 and ‘a spark plug of
Since spring 42 is extensible and retractable, the
the engine is thus required. The four input
same materially facilitates the assembly of the
leads entering socket 22 from a suitable dis
coils and sockets and insures against the pos
tributor may be shielded in a single conduit
sibility of ?ashovers in the assembled unit by
which may, in turn, extend from a shielding
keeping the high tension conductors Within tube 55 harness manifold of any suitable type well-known
3‘! insofar as is possible‘ and, hence, a maximum
in the art.
distance from any grounded metal parts.
There is thus provided a novel structure
A spring 46 may be connected to terminal 1'50
whereby a plurality of ignition coils adapted for
for making contact with a connector plug (not
use in a low tension ignition distribution system
shown) adapted to be received by socket tube 3'! 60 may be simply and compactly arranged in a sub
and to be detachably secured to nipple 32 by
stantially air-tight casing and yet provide ample
means
in the
nector'
engine
of a nut 41 in a manner well understood
art. A shielded lead 48 from the con
protection against ?ashovers and ample radio
shielding. Additionally, the coil unit provided
plug may extend to a spark plug‘ in an
is sturdy and reliable in use and may be con
or other point of use for ‘the high tension 65 veniently and advantageously mounted on the
current from secondary winding 34.
For the purpose of providing further assur
ance against ?ashovers from the high tension
conductors and terminals, to the other metallic
engine. The readily detachable electrical con
nections make it possible to renew the leads which
deteriorate in use more readily than most other
parts of an ignition system. The detachable
parts of the structure and of obviating the bad 70 leads also facilitate assembly and installation.
effects of changes in pressures resulting from
Although only a single embodiment of the in
changes in altitude, the, entire space around coils
vention is illustrated‘ and described, it is to be
I0 and sockets 31 within casing I'I, I8 is prefer
expressly understood that the same is not limited
ably ?lled with an insulating compound. Poly
thereto. For example, the number and arrange
mers of cashew-nut-shell oil or linseed Oil have ;15 merit of the coils may be varied, such as by‘ plac_
2,412,102
5
ing the same in a single line in an oblong
casing. Various other changes, particularly in
the arrangement and design of the parts illus
trated, may be made without departing from the
second-named pair of arms extending into said
recesses to position said coils in said casing, an
elongated socket extending longitudinally of each
coil and communicating with the exterior of said
spirit and scope of the invention, as will now be GI casing, and a terminal in each of said sockets
connected with the secondary winding of an ad
apparent to those skilled in the art. For a
de?nition of the limits of the invention, refer
ence is had primarily to the appended claims.
What is claimed is:
V
jacent coil.
4. In apparatus of the class described, a metal
‘lic casing comprising a substantially cup-like
1. In apparatus of the class described, a metal 10 body and a cover removably secured to the open
lic casing comprising a body portion and a cover
end of said body, oppositely facing internal re
cesses in the bottom of said body and said cover,
removably secured thereto, said cover having a
plurality of outlets therein, a plurality of ignition
coils in said casing, each having primary and
secondary windings, a metallic core for each of
said coils forming a magnetic ?ux path around
a portion of the latter, opposed recesses in said
body portion and cover for receiving portions of
said cores to position said coils in said casing,
an insulating tube adjacent each coil, each of
said tubes slidably extending into one of said out
lets in the cover, a terminal in each of said tubes,
means connecting each of said terminals to the
a plurality of transformer coils having primary
and secondary windings, and a metallic core for
each of said coils, each of said cores comprising
a pair of spaced arms extending longitudinally
of the coil, one of said arms extending through
the central opening in said coil and a pair of
arms extending'between the adjacent ends of
said ?rst-named arms, said second-named pair
of arms extending into said recesses to position
said coils in said casing, said coils being arranged
in the casing with the external longitudinally
extending arms of said cores adjacent the center
of the casing and with the coils and their connec
\tiOllS set in solidi?ed insulation.
_5. In‘apparatus of the class described, a metal
lic casing comprising a substantially cup~like
ungrounded ends of the primary windings of said
body and a cover removably secured to the open
coils, and means connecting the adjacent ends
of the primary and secondary windings of each 30 end of said body, said cover having a plurality
of outlets therein, oppositely facing internal re
coil to the casing interiorly thereof for grounding
cesses in the bottom of said body and said cover,
the same.
a plurality of transformer coils having primary
2. In apparatus of the class described, a metal
and secondary windings, a metallic core for each '
lic casing comprising a body portion and a cover
of said coils, each of said cores comprising a pair
removably secured thereto, said cover having a
of spaced arms extending longitudinally of the
plurality of tubular outlets therein, a plurality
coil, one of said arms extending through the
high potential end of the secondary winding of
an adjacent coil, a socket of a multiple plug and
socket connector in said body portion, means
connecting the terminals of said socket to the
of ignition coils in said casing, each having
primary and secondary windings, a metallic core
for each of said coils forming a magnetic flux
path around a portion of the latter, said body ‘
portion and cover having opposed internal re
cesses for receiving portions of said cores to posi
tion said coils in said casing, an insulating tube
adjacent each coil, each of said tubes slidably
extending into one of said outlets, a terminal in
each of said tubes, means including an extensible
resilient conductor under tension connecting each
of said terminals to the high potential end of
the secondary winding of an adjacent coil, a
socket of a multiple plug and socket connector in
said body portion, means connecting the ter
minals of said socket to the ungrounded ends
of the primary windings of said coils, means
connecting the adjacent ends of the primary
and secondary windings of each coil to the cas
ing interiorly thereof for grounding the same,
and a filler of yieldable solid insulating mate
rial in a dry non-moldable state ?lling the space
in said casing around said coils, and tubes and
?lling said tubes around said terminal connecting
means.
center opening in said coil and a pair of arms
extending between the adjacent ends of said
?rst-named arms, said second-named pair of
arms extending into said recesses to position said
coils in said casing, an elongated insulating tube
adjacent each coil having the upper end thereof
slidably extending into one of said outlets, a
terminal in each of said tubes, and means in
cluding an extensible resilient conductor for de
tachably connecting each of said terminals to the
secondary winding of an adjacent coil.
- '
6. In apparatus of the class described, a metal
lic casing comprising a body portion and a cover
removably secured thereto, a plurality of ignition
coils in said casing, each of said coils having a
primary winding, and a secondary winding and
terminals connected therewith, and a closed
3 metallic core for each of said coils forming a
magnetic flux path around a portion of the latter,
said body portion and cover having opposed in-'
ternal recesses into which radially extending p01“
'tions of said cores at opposite ends of said coils
?t for positioning said coils in said casing, and
said casing being ?lled with insulating material
3. In apparatus of the class described, a metal
whereby the coil and its connections are pro
lic casing comprising a substantially cup-like
tected against shock and insulated against ?ash-_
body and a cover removably secured to the open
overs.
end of said body, oppositely facing internal re
cesses in the bottom of said body and said cover,
said casing being ?lled with insulating material
and containing a plurality of transformer coils
having primary and secondary windings, a metal
lic core for each of said coils, each of said cores
comprising a pair of spaced arms extending
longitudinally of the coil, one of said arms ex
tending through the central opening in said coil,
and a pair of arms extending between the ad
jacent ends of said ?rst-named arms, said
'7. In apparatus of the class described, an in
sulation-?lled, metallic casing comprising a body
portion and a cover removably secured thereto,
said cover having a plurality of outlets therein
with insulation-retaining means separating their
“ ' outer from their inner portions, a plurality of
‘ignition coils in said casing, each of said coils
having a primary winding and a secondary wind
ing, a closed metallic core forming a magnetic
?ux path around a portion of each of said coils,
' said body portion and cover having opposed re
2,4 1 2,102
7
8
cesses into. which radially extending portions of
portions of said coresat opposite ends of the, coils
said cores at opposite ends of said coils, ?t for
positioning said coils in said casing, said coils
?t for positioning said coils in the casing, a tube
of insulating material adjacent each coil, a por
tion oiv each of said tubes slidably extending into
one of said outlets, a terminal in each of said
tubes intermediate the ends thereof whereby said,
being arranged, with the longitudinally, extending
portions of the cores outside said coils adjacent
the; center of the casing, and an elongated in
sulating socket communicating with each of said
tubes serve as sockets for removable plug con
nectors, means for connecting each of said ter
and a terminal in each of said sockets connected
minals to the high potential, end of the second
with they secondary winding of an adjacent coil. 10 ,ary winding of an adjacent coil, and a yieldable
8. In apparatus of the class described, a two
solid insulating material in a dry, non-moldable
part metallic casing, at least one of said parts
state ?lling the space in said casing around said
havingla plurality of outlets therein, means for
coils and tubes and ?lling said tubes around said
removably securing said parts together to form
terminal connecting means.
a closed casing, a plurality of ignition coils in said
11. In apparatus of the class described, a
casing, each of said coils having a primary Wind
metallic casing comprising a substantially cup
ing; and a- secondary winding, a substantially
=like body and a cover removably secured to the
open end of said body, said cover having a plu
closed metallic core for each of said coils form
ing a magnetic flux path around a portion of
rality of outlets therein, oppositely facing cross
the latter, said casing parts having opposed in 20 shaped recesses in the bottom of said body and
ternal recesses therein into which radially ex
said cover, a plurality of transformer coils hav
tending portions of said cores at opposite ends
ing primary and secondary windings, a metallic
of the coils ?t for positioning said coils in the
core for each of said coils, each of said cores
comprising a pair of spaced arms extending
casing, a tube of insulating material adjacent each coil, a portion of each of tubes slidably ex
longitudinally of the coil, one of said arms eX
tending into one of said outlets, a terminal in
tending through the central opening in said coil,
each of said tubes intermediate the ends thereof
and a pair of arms extending between the ad
whereby said tubes serve as sockets for removable
jacent ends of said ?rst-named arms, said
plug connectors, and means for connecting each
second-named pair of arms extending into said
of said terminals to the high potential end of 30 recesses to position said coils in said casing, an
the secondary winding of an adjacent coil.
elongated insulating tube adjacent each coil hav
9. In apparatus of the class described, a two
ing the upper end thereof slidably extending into
part metalliccasing, at least one of said parts
oneof said outlets, a terminal in each of said
having a plurality of outlets therein, means for
‘tubes, means including an extensible conductor
removably securing said parts together to form
for removably connecting each terminal to the
a closed casing, a plurality of ignition coils in
secondary winding of an adjacent coil‘, and yield
said casing, each of said coils having a primary
,able solid insulation in a dry, non-moldable state
outlets and extending longitudinally of said coils,
winding and a secondary Winding, a substantially
surrounding said coils and tubes in said casing.
closed metallic core for each of said coils forming
12. In apparatus of the class described, a
a magnetic flux path around a portion of the 40 ‘metallic casing comprising a substantially cup
latter, said casing parts having opposed internal
like body and a cover removably secured to the
recesses therein into which radially extending
open end of said body, said cover having a plu
portions of said cores at opposite ends of the
rality of outlets therein, oppositely facing cross
coils fit for- positioning said coils in the casing,
shaped recesses in the bottom of said body and
‘a tube of insulating material adjacent each coil,
said cover, a plurality of transformer coils hav
a portion of each of said tubes slidably extend
ing primary and secondary windings, a metallic
ing into one of said outlets, a terminal in each
core for each of said coils, each of said cores
of said tubes intermediate the ends thereof
comprising a pair of spaced arms extending
whereby said tubes serve as sockets for removable
longitudinally of the coil, one of said arms ex
plug connectors, means for connecting each of
tending through the central opening in said coil,
said terminals to the highv potential end of the
a pair of arms extending between the adjacent
secondary winding of an adjacent coil, a unitary
plug and socket connector for connecting the
primary windings of said coils to a source of
named pair of arms extending into said recesses
to position said coils in said casing, an elongated
electrical energy, and means connecting the ad
insulating tube adjacent each coil having the
jacent ends of the primary and secondary wind
ings of each coil to the casing for grounding the
upper end thereof slidably extending into one
of said outlets, a terminal in each of said tubes,
means including an extensible conductor for de
same,
10‘. In apparatus of the class described, a two
part metallic casing, at least one of said parts
having a plurality of outlets therein, means for
ends of said ?rst-named arms, said second
tachably connecting each terminal to the
secondary winding of an adjacent coil, yieldable
removably securing said parts together to form
solid insulation in a dry non-moldable state sur
rounding said coils and tubes in said casing, and a
a closed casing, a plurality of ignition coils in
said casing, each of said coils having a primary
winding and a secondary winding, a substantially
thin sheet of insulating material, such as
varnished cambric, extending between ‘each coil
closed metallic core for each of said coils form
ing a magnetic ?ux path around a portion of the
arm of the core therefor and between the termi
nal tube for said coil and an adjacent coil.
latter, said casing parts having opposed internal
recesses, therein into which radially extending
WALTER J. SPENGLER._
and the longitudinally extending external core
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