US2379004A

US2379004A - High tension spark ignition apparatus

Info

Publication number: US2379004A
Application number: US486095A
Authority: US
Inventors: Hulbert Ivan Jack; Tatlow Percy
Original assignee: Rotax Ltd
Current assignee: Lucas Support Services Ltd
Priority date: 1942-05-18
Filing date: 1943-05-07
Publication date: 1945-06-26
Anticipated expiration: 1962-06-26

Description

June 26, 1945. 1 a. HULBERT EIAL I l H H TENSION SPARK IGNITION APPARATUS 5 Sheets-Sheet l Filed May 7, 1945 ||l llL war t ng? 77. v. K II d-D 1.

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June 945. v U. HUU BERT m; 2,319

HIGHTENSION SPARK IGNI TION APPARATUS 4 j I. I k a FigQZ Inventors .z rzzuzberz'r 1 f TCLZZOJIZ fldys;

June 26, 1945.

1. J. HULBERT ET'AL 2,379,004

HIGH TENSION SPARK IGNITION APPARATUS 5 Sheets-Sheet 3 Filed May 7, 1945 fjz/vezz/iors' 1.11224Zfi' Patented June 26-, 1945 HIGH' TENSION SPARK IGNITION APPARATUS Ivan Jack Hulbert and Percy Tatlow, Willesden Junction, London, England, assignors to Rotax Limited, Willesden Junction, London, England Application May 7,1943, Serial No. 486,095

In Great Britain May 18, 1942 mm. (or. 171-209) This invention relates to high tension spark ignition apparatus for internal combustion englass. The object of the invention is to provide an improved distributor for use with a magneto or ignition coil.

In the accompanying sheets of explanatory drawings, Figures 1 and 2 are part sectional side elevations taken at right angles to each other, and Figure 3 is a plan (with the upper cover re moved), of a magneto embodying the invention.

In carrying the invention into effect as shown, we employ a hollow metal housing a which is wholly or partly closed, at its lower or inner end andopen at its upper or outer end. To the open end is attached a removable cover I), this being adapted to contain the high tension cables as c to be attached to the distributor stator (hereinafter described). The cover 2) may be provided with terminal blocks d for the connection thereto of the cables leading to the sparking plugs of the engine. The portion a of the housing a immediately adjacent to the cover b is of cylindrical form, and merges into the main portion of the housing, this main portion having a pair of parallel transverse walls a which terminate at their ends in arcuate walls a of the same curvature as the cylindrical portion of the housing. The chamber formed by the housing a serves to accommodate the distributor.

The distributor comprises a rotor e in the form or one or more blocks of insulating material mounted on a spindle ,f, the latter being supported by bearings g in the housing a so that the axis of the rotor extends across the housing. One of the bearings g is mounted in one of the transverse walls a above-mentioned, and the other ismounted in the inner end of a short hollow cylindrical member i fitting an opening in the other of the said transverse walls, the outer end of the hollow member being closed by a removable cover a. The hollow member 2 and end cover i'orm a chamber into which the adjacent end ,Of the spindle 1 extends, and which accommodates an interrupter associated with a spark generating winding or windings k hereinafter described, the interrupter being formed by a cam 11 on the said end of the spindle, and any. convenient contact mechanism (not shown) operable by the cam. The distributor stator comprises two or more insulating parts 0, p adapted to embrace the rotor and to be mounted within the housing. The part '0 comprises a block which is situated in the lower or inner part of thehousing a and is provided with one or a pair of input electrodes q in the and is provided with a plurality of separate outform or a segmental metal strip or strips adapted to be connected to the high tension winding or windings of the spark generator. This bloclr is accurately located in the housing a by a short central spigot T which enters a corresponding socket s in the housing. Alternatively any other equivalent locating means such as one or more dowels may be used. The two ends of this part 0 of the stator rest on shoulders t in the housing a, and are secured to the shoulders by screws as u. Theother part p of the stator may comprise a single block or a pair of blocks situated side by side in the upper or outer part of the housing a,

put electrodes 0 adapted to be connected to the high tension cables as c leading to the sparking plugs or to the terminal blocks d. This part p of the distributor is formed with a pair of parallel sides to terminating in arcuate ends a: which for ashort distance from the upper or outer face of the said part are adapted to fit closely the cylindrical open end portion a of the housing 0:. Securing of the stator part p is effected by nuts and studs 3 extending through holes in both stator parts p, 0 into the shoulders t above-mentioned.

uWhen a large number of sparks are required in each rotation of the rotor e, theupper or outer part p of the stator is provided with a correspondingnumber of output electrodes 1) arranged in for example four parallel groups, and the rotor is then provided with two connecting electrodes 2 each of which is cranked as shown in Figure 1 so that during one halfa revolution one end co-'- operates with one group of output electrodes and during the other half revolution the other end cooperates with the adjacent group.

A distributor as above described may be used in conjunction with a separate and independently arranged ignition coil or coils. When it is reone end of themagneto-rotor spindle. Within' the housing a are arranged the usual pole pieces 6 and in association with. these are arranged the generating windings k, of which there may be The magneto-rotor spindle 3 is situated two, these being situated in the housing at onposite sides or the magneto rotor 2.

By this invention we are able to provide in a simple and compact form a distributor, or combined distributor and magneto especially adapted for use on aircraft engines in which a large number of sparks are required in each rotation of the distributor rotor, and in which complete metal enclosure is required. Moreover we are able to provide easy accessibility to all the internal parts, The invention is not, however, limited to the example described as subordinate details may be varied to suit requirements.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is:

A spark ignition distributor comprising the combination of a metal chamber having its interior shaped at least in part to a'cylindrical shapeta distributor rotor having its axis extending transversely across the chamber, and a distributor stator arranged within the chamber and consisting of two parts which embrace opposite sides of the rotor,'one of the said parts having a locating connection with and adjacent part 01 the chamber, and the other stator part having arcuate end surfaces which serve by contact with the cylindrical inner surface of the chamber to locate the last'mentioned stator part within the chamber.

IVAN JACK HULBERT. I PERCY TA'ILOW.