Патент USA US2106449код для вставки
Jan. 25, 1938., ¢_ R‘BOYD 2,106,449 SPARK PLUG Original Filed Sept. 12, 1954 H6 0 5J4 . W5 Patented Jan. 25, 1938 2,106,449 ' UNITED STATES PATENT OFFICE-p‘, r 2,106,449 SPARK ‘PLUG Charles E. Boyd, Chicago, Ill. Application September 12, 1934, Serial No. 743,669 Renewed March 5, 1937 4 Claim. This invention relates to improvements in spark plugs for internal combustion engines. (Cl. 123-169), gasket l8 may be used for sealing the joint be tween the shell IO and the wall I‘. > It is an object of my invention to provide a The shell I0 is tubular in form and is adapted spark plug which is self~cleaning in use, which will ?re longer without becoming fouled with to receive an insulator 20,'which is intended ‘to , be of the best grade of refractory and having a f‘; ’ oil, which will maintain a ?xed spark gap, which will generally have a longer life and which may be readily assembled and disassembled. It is further an object of my invention to pro vide a spark plug in which the ground electrode . is positioned diametrically of the plug and will act to split and de?ect the oil to prevent clogging and fouling of the spark gap by the oil. an additional gasket 30 above the shouldered por tion 26 of the insulator. An electrode 32 extends axially through vthe insulator 20 and the outer extremity 34 of the electrode is provided with a 115 terminal connector 36. The inner'extremity 38 of the electrode 32 protrudes for a short distance beyond the tip 22 of the insulator; '20 I j , I provide a ground electrode 40 positioned dia metrically with respect tojthe shell l0 and ?xedly .20 secured at its ends to the shell I0. It'will be apparent that since the electrode 40 isrlgidly m 2 E on Q. a :3 position, that it isnot subject to de 25 ?ection by the heat andtherefore the spark ‘gap between the ground electrode 40 and the- central 2s electrode 38 remains 30 following description taken in connection with 35 the attached drawing, in which Figure 1 is a side elevation of my improved plug and showing in section a portion of the cylinder wall in which the spark plug is mounted; Figure 2 is a side elevation of the spark plug, 40 the view being taken at right angles to that of Figure 1; Figure 3 is a vertical section taken on the plane indicated 3—3 in Figure 2; 45 Figure 4 is a plan view of the lower end of the plug; Figure 5 is a side elevation of a modi?ed form of the plug, and Figure 6 is a plan view the plug shown in Figure 5. of the bottom end of 50 The spark plug in the usual manner includes a metallic shell l0 having a threaded portion 12 whereby the plug may be threaded into the cylin , as illustrated in Figure 1. The head of the shell 10 is formedwith a nut portion [6 65 for threading the plug into the wall I4 and a vented from fouling the spark gap. I provide novel means forventing ‘the spark 135 2,106,449 2 v substantially thin ring-shaped portion at the low . The lateral openings 42 provide vent openings er end of said shell and said openings being lat for the spark gap and also form a ring-shaped portion 44. This relatively thin metal ring may also be formed by a plurality of openings such as shown in Figure 5 to be presently described, wherein the ring is supported from the body of the erally disposed with respect to the axial spark gap between the electrodes. 2. A spark plug comprising a substantially tu bular metallic shell adapted to be threaded into a cylinder wall, a notched vent opening formed in the lower end of said shell below the threaded portion thereof by a substantially horizontal cut and an angular cut, a ground electrodejdiamet 10 shell by several narrow portions. The ring read ily heats up during use of the plug and therefore burns off any oil or other matter deposited there on. The ground electrode associated with the 10 ring portion is also maintained at a relatively high temperature and thus is self-cleaning. This self-cleaning feature is also present in the center electrode which is covered and protected by the 15 ‘ rically positioned with respect to the lower end of said shell and ?xedly secured to said shell im mediately beneath said notched opening, an in sulator centrally positioned within said shell and removably secured thereto, the lower end of said insulator 22 except for the lower tip 33. This tip therefore readily heats up and likewise burns off the oil that may be deposited thereon. Although I have shown in Figures 1 to 4. a pre insulator terminating substantially adjacent the upper edge of said‘ notched opening and an elec trode carried by said insulator and axially pro jecting from the lower end thereof to provide an ferred design of my plug, it will be obvious that 20 other forms may be resorted to without departing axial spark gap with respect to said ground elec trode, whereby said vent opening isv laterally dis from the spirit of my invention and the venting openings may be formed in different manners. For example, I have shown one modi?ed con struction in Figures 5 and 6 in which the spark plug construction is substantially as that dis closed in Figures 1 to 4 except that the shell l9, , instead of being formed with notched openings, is provided with a plurality of radial holes 553. In both forms it will be apparent that the venting 30 openings are laterally disposed with respect to the spark gap and it should also be noted that the lower or inner end of the insulator 2i] termi nates in a horizontal plane with or preferably above the inner and upper edges of the venting 35 openings in order to prevent fouling of the insu lator and burning of the electrode. It has been posed with respect to said spark gap. found by test that spark plugs as disclosed herein will have a' longer life without‘failure than other plugs now on the market when used under similar and it is believed that the improve 40 conditions ments in operation are due to the novel arrange ment and cooperation between the ground elec trade and the venting openings. Various changes and modi?cations may be re sorted to in the practice of my invention without 45 departing from the spirit of my invention as ex pressed in the appended claims. I claim: ' ‘l.'A spark plug comprising a metallic shell 50 ' 3. A spark plug comprising a substantially tu bular metallic shell having an external thread 25 thereon whereby said shell may be threaded into a cylinder wall, the lower end of said shell be neath said external thread having a pair of notched openings cut therein through a large area thereof and de?ning at the lower end of said shell a substantially thin ring-like portion sup ported from the body of said shell by relatively narrow uncut portions, a ground electrode di ametrically positioned with respect to said ring like portion and ?xedly secured at its ends there to, an insulator centrally positioned with respect to said shell and removably secured thereto, a central electrode carried by said insulator and pro jecting from the lower end thereof to leave a sub stantially axial spark gap between said electrodes whereby oil is deflected from said spark gap by said ground electrode and vented through said opening to prevent fouling of the plug. ' 4. A spark plug comprising a metallic shell, an insulator centrally positioned within said shell, an electrode ?xedly secured to the lower end of 45 said shell, an axially disposed electrode carried by said insulator and projecting from the lower end adjacent to said ground electrode to leave a spark gap, said shell having a plurality of notched open ings formed therein above said ground electrode 50 adapted to be threaded into a cylinder wall, a and disposed substantially laterally with respect ground electrode diametrically positioned with re to the spark gap, said notched openings having a spect to said shell and ?xedly secured at its ends size and being arranged so as to leave a substan to the lower end of said shell, an insulating elec tially thin ring-shaped portion at the lower end of said shell, whereby said relatively thin ring 55 portion will heat up readily and burn o? any oil trode-retaining body positioned centrally within said shell and removably secured thereto to provide 55 an axial spark gap, said shell having notched openings formed therein adjacent the lower end thereof and above said ground electrode, said notched openings being so formed as to leave a that may be deposited on the ring or on the ground electrode having association therewith. ' CHARLES R. BOYD.