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Патент USA US2127513

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‘Aug. 23,1938.
’
w. HARPER, JR
2,127,513
r SPARK PLUG
Filed May 25, 1957
INVENTOR
'
?ézz/a/vA’aipzi/é
BY
ATTORNEY
Patented Aug. 23, 1938
2
UNITED STATES PATENT OFFICE
2,127,513
SPARK PLUG
William Harper,pJr., Port Washington, N. Y., as
signor to H. B. Motor Corporation, New York,
N. Y., a corporation of New York
Application May 25, 1937, Serial No. 144,575
7 Claims. (01. 123-189)
This invention relates to spark plugs and aims
to provide a spark plug of great durability and to
increase the ef?ciency in smoothness of operation
of internal combustion engines.
through the orifice IS in passing from the lower
portion I41 to the upper portion it? of the
chamber. It, therefore, ?ows more rapidly in the
ori?ce'than in the other parts of the chamber
In accordance with the invention, these objects, as well as other advantages, are attained by
providing means for creating a zone of relatively
low pressure at the point of ignition. This facili-
and thus creates a zone of relatively low pres- 5
sure at the ori?ce which surrounds the spark gap.
Most desirably, the passages 23 are inclined as
shown so that they enter the lower portion I41 of
tates the passage of the spark between the elec“) trodes and also places in the spark gap the molecules of the mixture which kindle most readily
and thus increases the effectiveness and rapidity
of the ignition.
The zone of low pressure is
created by a reduced ?ow orifice surrounding the
is spark gap and also by a swirling of the mixture
within the ignition chamber. Both the ori?ce
and the swirling are also of value in protecting
the insulation of the spark plug from excessive
heat and thus increasing its durability.
the chamber tangentially causing a rapid whirl
ing of the mixture as it enters and passes up- 10
ward in the chamber. The centrifugal effect of
this whirling reduces still further the pressure
at the spark gap 22 as compared with that at the
circumferential parts of the chamber. The
swirling is_nowhere obstructed as both the elec- 15
trodes l0 and 2i lie on the axis of the chamber.
The spark between the electrodes l0 and 2| co
ours in the zone of lowest pressure and rapidly
ignites the mixture in the chamber I4._ The
burning mixture in the chamber is projected in 20
jets through the passages 23 into the main body
of the mixture which is therebyrapidly ignited.
The “explosion pressure" developed in the
20
An illustrative spark plug embodying my invention is shown in the accompanying drawing,
in which:
Fig. 1 is a side view partly in axial section;
25
Fig. 3 is a section on the line 3—3 of Fig. 1, momentarily causes burning gas ‘to ?ow into the
looking in the direction of the arrows.
'
chamber it through the passages 23. This hot
The spark plug shown in the drawing includes gas swirls about the lower part I41 of the
an insulator ll of ordinary‘ construction, a metal chamber and then rises still swirling along the
body H of special construction and two electrodes wall of the upper part M2 of the chamber before
“1,21. The body I 2 has a nut portion I5, an ex- it strikes the insulator II. It thus traverses a
ternally threaded tubular portion l6 which ex- long path over thick metal parts adapted to con
tends well beyond the innerend of the insulator duct away heat before it strikes the insulator.
II, and a shield portion I ‘l which substantially In this way, the portion of the insulator in the
closes the innerend of the tubular portion but chamber is well protected against excessive
contains passages hereinafter described. The heating.
body l2 supports the insulator II in the usual
The portion of the insulator II in the chamber
manner, a nut l3 being used to secure the insu- is well protected against excessive heat, as no
lator to the body. The tubular portion. "5 and radiant heat can reach it from the cylinder and
the Shield portion 17 0f the body provide a, as the hot mixture entering through the pas
chamber l4 enclosing the inner end of the insu- ‘sages 23 swirls about in the ‘lower part I41 of the
lator II and the spark gap 22 provided between chamber and then rises along the wall of the
the electrodes l0 and 2|. The spark gap is at an upper part M2 of the chamber before it strikes
intermediate point on the axis of the chamber !4 the insulator. It thus traverses a long path over
but near the inner end of the chamber. An thick metal parts adapted to conduct away heat
annular projection l8 on the inner wall of the before it strikes the insulator.
chamber l4 divides the chamber into an inner
What-,1 claim is:
portion I41 and an outer portion H2 connected by
1, A spark plug comprising an insulator, a, body
Fig. 21s a bottom or inner end view, and '
30
'
35
40
45
an ori?ce IQ of reduced diameter-
cylinder on complete ignition of the mixture
25
30
‘
.35
40
46
supporting the insulator and forming a casing '
When the Spark Plug is mounted in an engine
(A) cylinder or head in the usual manner, the inner
Portion ‘"1 0f the chamber '4 is in eommunication with the cylinder through passages or bores
23 in the shield H. The mixture which ?ows into
the ignition chamber through these passages dur-
providing a chamber enclosing the inner end of
the insulator and containing passages entering 50
the inner end of said chamber, electrodes pro
viding in the chamber a spark gap extending
lengthwise of the chamber, and means other than
said electrodes providing in the chamber a re
55 ing the compression stroke of the engine is forced
duced ori?ce surrgunding the spark gap.
2
2,127,513
2. A spark plug comprising an insulator, a body
supporting the insulator and forming a casing
providing a chamber enclosing the inner end of
the insulator and containing passages entering
the inner end of said chamber, electrodes provid
ing in the chamber near the inner end thereof
a spark gap extending lengthwise of the chamber,
and means other than said electrodes providing
in the chamber a reduced ori?ce surrounding the
spark gap.
the inner end of said chamber tangentially, elec
trodes providing a spark gap’ in the chamber on
the axis of the chamber near the inner end there
of, and an internal annular projection on the.
casing dividing the chamber into two parts con 6
nected by a reduced ori?ce surrounding the spark
gap.
_.
-
‘ 6; A spark plug comprising 'an- insulator, a
metal body supporting the insulator and form
ing a casing providing an enclosed chamber sur 10
3. A spark plug comprising an insulator, a body , rounding the inner end of the insulator and con
supporting the insulator and forming a casing taining passages, all of_ which enter the chamber
providing a chamber enclosing the inner end of tangentially to create therein a body of gas
the insulator and containing passages entering swirling about the axis of the chamber, a pair
the inner end of said chamber tangentially, elec
of electrodes lying on the axis of the chamber
trodes providing a spark gapin the chamber, and so as not to retard the swirling of the gas, and
means providing in the chamber ‘a reduced ori?ce providing a spark gap in the chamber spaced
surrounding the spark gap.
from its inner end and on the axis of the cham
4. A spark plug comprising an insulator, a body her.
supporting the insulator and forming a casing
7. A spark plug comprising an insulator, a
providing a'chamber enclosing the inner end of metal body supporting the insulator and having
the insulator and containing passages entering a tubular portion extending beyond the inner end
the inner end of said chamber tangentially, elec
of the insulator, a shield vclosing the inner end
trodes providing a spark gap in the chamber on
the axis of the chamber, and an internal annular
projection on the casing dividing the chamber
into two parts connected by a reduced ori?ce
surrounding the spark gap.
5. A spark plug comprising an insulator, a body
supporting the insulator and forming a casing
providing a chamber enclosing the inner end of
the insulator and containing passages entering
of said ‘tubular portion and increasing in thick- ‘
ness from its center towards its periphery and
containing passages, an axial electrode carried
by said shield and extending into the tubular
portion of said body, and an axial electrode car
ried by the insulator and opposed to said other
electrode to provide a spark gap.
30
WILLIAM HARPER, JR.
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