DE2430933A1 - SPARK PLUG ARRANGEMENT IN ROTARY LAMP ENGINEERING MACHINES - Google Patents

Description

Patentenwslt

1 EERUN 1 ». ■,. '. ■" ■ - .. ■. ■

2 June 3, 1974

W-w-3054

j General Motors Corporation, Detroit, Mich ,, Y ₀ St ₀ A,

Spark plug arrangement in rotary piston internal combustion engines

The invention relates to a spark plug ι arrangement in three-piston internal combustion engines, which are in the wall a housing receiving a rotary piston for receiving a ! Spark plug contain a bore, the end of which on the inner wall ■ of the housing forms an ignition opening and one with a thread provided 3? part and one coaxial to the axis of the bore, frustoconical surface converging to the ignition opening has «," ■ "-..--

One of the most important tasks in the further development, development of rotary piston internal combustion engines consists in achieving a combustion that is as perfect as possible, in order to reduce the content

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to keep unburned hydrocarbons in the exhaust gases to a minimum ₀

■ - ". / - It is necessary to ^ avoid misfires and make the ignition energy fully effective z * i«

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Known spark plug arrangements of the initially mentioned;

th type, such as, for example, B _o US PSn % 597,648 or £ 3,719.50 have the

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part that is formed in the area of ^¥ erbrennungskammer bags gas losses and further require Mn ^ Jbisammeln oil

409884/1085 ^ ² -

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Allow ι and soot, which prevents perfect ignitions

i can be. Furthermore, between flat surfaces on the ignition *

candle and ^ ehäuse compressible seals provided _o to reach the gas-tight fastening of the spark plug this: Education does not allow but a precise definition of the UNJ direct part of the spark plug and the spark gap in the: surface of the inner wall of the housing ·. A protrusion of the spark

j candle in the combustion chamber and thus in the path of the turning ; To avoid piston is therefore the distance of the lower end

! from the ignition opening. This leads to the formation of the mentioned lags and also leads to the fact that not the full ignition energy is used effectively to initiate the combustion

It is true that the SAE publication 670 14 © "Development of a new automotive spark plug" (Detroit 9-13ο1ο j I 1967) frustoconical jacket-shaped sealing surfaces at Funkens trek * * j ken spark plugs. But these were with the fun «= · ' ! kenstreeke arranged in the upper part of a combustion chamber!

j and the formation of the sealing surfaces aimed at a reduction - I
to obtain the diameter of the spark plug housing β « ^;

j I

j The e _r-making for its object, a Zündj ·

I kerzewanOrdnung of the aforementioned type so on aussugestal · I th, that a substantially closed combustion chamber \

i j

is achieved into which the spark plug does not protrude so that no j Pockets arise in which grass is lost or Oil and Ruse could enter, and further a full exploitation to achieve the ignition energy »

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This object is achieved by the further advantageous features cited in the characterizing part of claim 1 Refinements of the invention emerge from the subclaims

The inventive design is a Optimum ignition effect is achieved because the spark gap is right next to it the combustion chamber, so that a good combustion is achieved * follows and the exhaust gases contain only small amounts of unburned hydrocarbons included * Since pockets are also avoided, which cause gas losses or the accumulation of Ul or soot flawless ignition is always guaranteed deviations from the intended assignment of the parts to each other lie within the framework of production tolerances that are too small to endanger the intended effects "

The drawings show an exemplary embodiment of the Invention illustrated «show in the drawings

Pig 1 a partial section through a rotary piston internal combustion engine with an inserted spark plug,
Fig, 2 is a plan view in the direction of arrows 2 ^ 2

seen in Figo 1 and

* 3 a vertical center cut through the spark plug, »

In Pigei part is set as _r 1 of a housing of a rotary piston internal combustion engine having an outer wall 3 and an inner wall 5, the shape of a chamber trochoidaler

09 & 84/1085

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for a rotary piston (not shown) "limited in the housing 1, a bore 7 extending from the outer wall to the inner wall is formed, the opening of which in the inner wall 5 is an ignition opening 9 forms.

Between the ends of the bore 7, the latter containing a threaded portion 11, is screwed into the spark plug 13, the winch for this Zyrdck at its spark plug shell 17, an external thread 15 carries ₀ In a modified example, but the B could festi- _e j supply of the spark plug 13 in housing 1 also in other known Wei-j

se take place *!

ι In the bore 7 is also a truncated cone jacket j

i-shaped! surface 19 is formed, which in the direction of the inner wall 5:

: I.

of the housing converges and is coaxial with the axis of the bore 7 I

is o As Figo 1 and 3 show, the spark plug housing ': .Xi / I

17 has a corresponding truncated cone-shaped counter surface / which rests directly against the one in the bore, so that when the spark plug is screwed in, a gas-tight support takes place at this point. This support creates a plane 18 through ^! the lower end of the spark plug 13 is properly fixed, so that it lies close to the ignition opening 9 somewhat radially outwards to the inner wall 5 of the housing

! lower end 23 of a center electrode 25 and the lower end 27

each insulating body 29 is designed in such a way that it lies somewhat radially outward of the plane 18 «,

The lower end 31 of the spark plug housing 17 forms next to the lower end 23 of the center electrode 25 an annular one j Ground electrode, whereby the space between the two electrodes is

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[sentliehen by da _g lower end 27 of the insulator 29 excluded! is filled "In this way, tabs avoided in this area, this being still does characterized Unters is that also the lower end 31 of the Zündkerzeiigehäuses 17 for filling the ignition - Opening 9 is used. "The lower end 8 of the bore 7 has • like the lower end 31 of the spark plug housing, a cylindrical shape

dm essentially the same diameter knife _β the same effect can.

! But this speed can also be achieved with differently designed forms ! as long as they are trained accordingly © The lower one

Part 8 of the bore 7 is here, in order to achieve the smallest possible feed opening 9, much smaller in diameter than the other ropes this comes to lie in the area of the ignition opening ₀

In accordance with FIG. 3, the insulating body 29 is gas-tight in FIG

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, the spark plug housing 17 is inserted, to which an upper gas seal ■ 35 and a lower seal shoulders 37 are provided with a glazed surface "latter lies against a correspondingly ausgejbildete S Hulter 39 on the spark plug housing 17 at _c. Instead of the! Shoulders, however, a lower gas seal known per se could also be

|! tung be provided ₀ The upper end 41 of the center electrode 25 list in the central bore 43 of the insulator 29 by means of a conventional electrically conductive Giasdichtung gastight abgedichet ,. for which a seal according to US Pat. No. 3,538,021 can be used «, ',

In the exemplary embodiment, the upper gap is designed in accordance with the US patent application Ser _o Bi0o267 090

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"Bolt 45 carries a cap-like flange. 47, which is supported on the upper end of the insulating body 29. Since both surfaces \

are rough, is a vent path between the insulating body; and the flange formed The terminal bolt 45 is held by a retaining ring 49 body 29 by magnetic * ι the insulating - deformation rollers o ₀ the like to the designed as a rib 51 obe-. pure edge of the insulator is bent _E at The inner surface of the - ^ altering has several ventilation grooves 53. Furthermore, a spacer 55 made of metal is provided in the central bore 43 of the insulating body in a known manner. In order to determine the distance between the central electrode 23 and the connecting bolt 45

-7 *

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Claims (1)

m, Π mm Patent claims: 1 j Zündkerzemamordnung in Drehkolljen internal combustion engines, which in the wall of a rotary piston receiving a housing "for receiving a spark plug have a bore, the opening in the inner wall of the housing forms an ignition opening" and which has a threaded part and one to the axis of the Bore has coaxial, to the ignition opening converging frustoconical jacket-shaped surface, thereby ge «: ken η ζ calibrated η et, that _{s s} s a spark gap spark plug ' (13) has a center electrode (25) and into the bore (7) of the housing (1 ) is inserted, the lower end of the center electrode is inserted gas-tight into the central bore (43) of a ceramic insulating body (29), which sits gas-tight in a spark plug housing (17) made of metal with an external thread (I5) can be screwed into the threaded part (11) of the bore (7) and with a frustoconical surface (21) for direct ren gas-tight contact against the truncated conical surface (19) of the bore g and with its lower end face (31) essentially inside the Zümd opening (9) of the bore, which essentially fills it, the lower faces | the center electrode (25) and the insulating body (29) lie close to the mouth of the ignition opening in this set back slightly inwards to the end face (31) of the spark plug housing, and the position of a plane (18) passing through this close to the inner wall ( 5) of the housing slightly offset radially outward to this by the frustoconical support surfaces. 40 9884/108 5 -S- Guaranteed is © j 2o spark plug arrangement according to claim 1, characterized in that that the lower part (8) accommodating the spark plug (13) Bore (7) ne "ben the ignition opening (9) has a cylindrical shape and a much smaller diameter than the rest of the Bore has ₀ 3 ο spark plug assembly according to claim 1 © 2, since · - · by in _s a s the lower end face dee spark plug housing (17) plane containing f 18) is substantially tan ·! gential to the inner wall (5) of the housing in the area of the Zündöffnun ^ (9). 409884/1085 Blank page