US2321505A - Ignition generator - Google Patents

Description

June 8, 1943. E. B. NOWOSIELSKI IGNITION GENERATOR Filed June 1, 1940 INVENTOR FF/1007a" /V)z "rlfzi. 615% 1' BY 8 r 4 3; ATTORNEY Patented June 8, 1943 IGNITION GENERATOR Edward B. Nowosielski, Bloomfield, N. J., assignor to Edison-Splitdorf Corporation, West Orange, N. J a corporation of N cw Jersey Application June 1, 1940, Serial No. 338,331

8 Claims.

This invention relates to the construction of an ignition generator of the magneto type, in which the rotor carries a permanent magnet for cooperation with the field structure that supports the ignition coil.

In starting certain engines, such as are used in aeroplanes, the initial rotative speed of the magneto rotor, as usually constructed, is relatively slow and the spark weak when it should be a good hot spark to fire the relatively poor mixtures that are present at the time of starting.

In my application, Serial No. 326,562, filed March 29, 1940, I have shown and described a type of magneto which overcomes the objection above referred to. My present application is directed to a further type of construction which will also overcome the principal objections previously referred tov Another object of my invention is to provide a rotor structure which is small and relatively light, whereby it may be driven at any desired speed to produce the necessary number of sparks from an ignition coil.

These and other objects will be apparent to one versed in the construction of ignition generators, from a reading of the attached specification, taken in connection with the annexed drawing, wherein the single figure shows a longitudinal, sectional view through the magneto.

In the drawing, there is shown a magneto having a main housing section I provided with an end bearing support 2 to which there is fastened a second housing section 3. The housing section 3 has a mounting face which is provided with an annular shoulder 4 adapted to fit a cooperative construction on the engine, the flange portion of the housing section 3 being provided with mounting holes 5, one of which is shown. The main drive shaft 8 of the magneto is supported by a double row or twin bearings l which are carried in a holder 8, the holder having a flange 9 seated in the flange of the housing section 3 and held thereto in any satisfactory manner as by a collar ID. The inner end of the shaft 6 has a hollow enlargement 50 to receive a pair of bearings 48 held in spaced relation by a spacing collar which may fill part or all of the space between the bearings 48. These bearings are on a stub shaft 41 carrying a gear-wheel ll having internal teeth adapted to mesh with the teeth of the pinion I2 carried on the rotor shaft l3. This construction provides a drive in which several teeth of the gears are continually in mesh as distinguished from the ordinary gears having only one or two teeth in mesh, thus giving a quieter and better drive.

The gear II has a projecting hub 49 that is linked to centrifugally operated arms carried on pins 43 which are fastened to a disc 42 integral with or rigidly fastened to the shaft 6. This provides an automatic advance coupling mechanism whose position is indicated by a broken line 4!. Since this type of construction is old and well-known, it is not further described herein, but reference may be made to Moore Patent 1,388,743, issued August 23, 1921.

Adjacent the pinion I2 is a bearing [4 which supports this end of the rotor shaft. The opposite end of the rotor shaft is screwed to a stub shaft l5 which is fastened to the rotor structure Hi. The shaft I5 is supported by a bearing l1 and also carries a gear It in mesh with a distributor gear IS. The gear I9 is fastened to a flange 20 of a timer-distributor shaft 2| which is supported by bearings 22 and 23 carried on a bearing support member 24. A cam 25 is carried on the inner end of the timer shaft 2| for operating a circuit breaker 26, across the contacts of which is connected the usual condenser 44.

The rotor iii of the magneto will carry any desired form of permanent magnet so as to give two, four or more magnetic flux changes through the core 2! of the ignition coil 28, it being understood that the core 21 of the ignition coil is connected by laminated pole pieces 29 which extend into cooperative relation with the laminated pole shoes of the permanent magnet carried by the rotor l6.

Fastened to the flange 20, in any satisfactory manner as by a plurality of screws 30, only one of which is shown, is a distributor disc 3| having a centrally located contact 32 to which contact is made a spring-pressed brush 33 that is connected to the ignition coil by a conductor 34. The main distributor point 35 of the disc 3i is connected to the contact 32 by a third suitable conductor 36 as indicated. A housing section 31 carries a distributor block 38 having the usual outlet cable recesses 39. A starter cable or conductor 40 is indicated which is connected to the starting magneto usually used. The outgoing cables from the distributor block 33 pass through an outlet to which is adapted to be attached a shielding duct going to the engine spark plugs.

If the automatic advance mechanism, Whose position is indicated by the broken line 4|, is not used, then the gear II will be fastened directly to the shaft 6 with such other changes as will be necessary.

Interposed between the housing sections I and 31 is a partition wall on which is mounted the bearings l1 and 22 aforementioned, and positioned against an annular seat in the housin section 31 is a partition wall 45. These partition walls enclose a compartment 52 within the magneto housing forthe gears l8 and I9. Moreover, the partition wall 45 serves to separate the distributor from the other parts of the machine, thereby preventing oil from the gears and bearings from being thrown onto the distributor and at the same time acting to prevent detrimental, ionized gases, formed by the jump sparks, from flowing through the machine.

It will be understood that the embodiment of my invention herein shown is illustrative and not limitative of my invention since many changes and modifications may be made therein within the range of engineering skill without departing from the scope of my invention, which I undertake to express according to the following claims.

What I claim is:

1. In a magneto comprising a rotor and pole pieces, an ignition coil associated with said pole pieces and a rotary element for distributing the current produced in said coil: the combination of a housing comprising two separable sections, a first removable partition between said sections, a second removable partition stationary in relation to the housing and forming a gear compartment with said partition, said rotor, pole pieces and coil being disposed in one of said sections and said distributor element being disposed in the other of said sections; respective shafts for said rotor and distributor element each having portions within said gear compartment; and gearing in said compartment interconnecting said shafts.

2. In a magneto construction: the combination of a housing having two removable parallel partitions forming three compartments in line; a magnetic system in one end compartment including a rotor, pole pieces associated with said rotor and an ignition coil associated with said pole pieces; a distributor for the high tension current of said coil disposed in the other end compartment; and gears in the intermediate compartment coupling said distributor to said rotor.

3. A magneto construction comprising a housing, a magnetic system including a flux-controlling rotor journalled internally of the housing and disposed at one side thereof, one end of the housing having a face adapted for mounting the magneto to a support; a drive shaft journalled in said housing and projecting through said mounting. face, said drive shaft being parallel to the axis of the rotor and offset therefrom towards the center of the magneto; and gearing within the housing providing a stepped-up transmission from said drive shaft to said rotor.

4. A magneto construction comprising a housing provided with a mounting face at one end, a magnetic system including a flux-controlling rotor having a journal internal of the housing, the axis of said rotor being normal to said mounting face and offset to one side from the center thereof; a drive shaft projecting through said mounting face centrally thereof and journalled in said housing; and a set of internal gears coupling said drive shaft with said rotor.

5. A magneto construction comprising a housing having a mounting face at one end thereof; a magnetic system including a flux-controlling rotor having a journal internal of the housin the axis of said rotor being normal to said mounting face a drive shaft offset from the axis of said rotor in parallel relation thereto and proj'ecting through said mounting face; and internal gears providing a stepped-up transmission from said drive shaft to said rotor.

6. In a magneto including a housing: the combination of a rotor in said housing having a shaft journalled in an end wall portion thereof; a removable cylindrical casing mounted on the said end wall portion of the housing in a-position wherein the casing is axially offset from said rotor shaft, a central outer-end wall portion of said casing serving as' dowel for mounting the magneto to a support; a drive shaft journalled in said casing centrally of its said dowel portion; and internal gearing forming an offset coupling between said shafts having a transmission ratio other than unity.

7. A magneto construction comprising a main housing section, a magnetic system including a flux-controlling rotor having a journal in one end of said main section, a housing extension on said one end of the main housing section having a face at its outer end adapted for mounting of the magneto to a support, a drive shaft journalled in the outer end wall of said housing extension at the center of said mounting face, said shaft terminating within said housing extension into a bearing; a member journalled in said bearing and internally geared to said rotor; and an automatic spark advance device in said housing extension between said drive shaft and said member.

8. In a magneto including a housing and comprising a rotor having a shaft journalled in and projecting through an end' wall portion of said housing: the combination of a casing mounted on the said end wall portion of said housing and forming a compartment with the latter; a drive shaft journalled in the outer end of said casing and terminating into a bearing within the casing; a gear journalled on said bearing and coupled with said rotor shaft; and an automatic advance device in saidcasing operatively interconnecting said gear and drive shaft.

EDWARD B. NOWOSIELSKI.

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