US1724618A - Magneto - Google Patents

Description

B. P. REMY Aug. 13, 1929.

MAGNETO Filed Aug. 5, 1927 v A TTORNEYS.

Patented Aug. 13, 1929.

UNITED STATES BENJAMIN P. REMY, OF INDIANAPOLIS, INDIANA.

MAGNETO.

Application led August 5, 1327. Serial No. 210,773.

This invention relates to an improvement in inductor generators, and the chief object thereof is to produce an inductor generator or magneto of but a relatively few parts and these of simple construction, and arrange the same so as to improve the electrical and mag'- netic operating characteristics, as well as the mechanical construction.

(,)nc feature of the invention resides in the reduced dimensions of the magneto by the provision of internal bearings for the inductor, which internal bearings are retained in position by suitable end plate anchorages, which in turn retain the magnets and may support the cover of the mageto. This construction etlects a reduction in over all size of the magneto for permitting it to more readily be accommodated to the engine.

Another feature lof the invention consists in having the polar extensions, including the pole faces, only partially encircled by the non-magnetic (die) metal so as to provide a large intermediate air gap involving a damping effect due to the induced currents flowing in the closed paths around said polar eXtensions.

A further feature of the invention consists in pivotally mounting the inductor and arranging the same so that it can be oscillated or rotated as desired, and the magneto successfully operate in either instance.

lVhereas, the improvements are herein shown with respect to a. magneto of the rotary type, they are equally applicable to an oscillatory magneto. Y

The full nature of the invention will be understood from the accompanyingr drawings and the following description and claims:

Fig. 1 is a central sectional view thru the ma gncto. Fig. 2 is a transverse sectional view taken on the line 2-2 of big. 1. Fig. 3 is a top plan view of the magneto with the cover removed. Fig. 4 is a sectional view taken on line 4-4 of Fig. 1. Fig. 5 is an end elevation of the base or bottom pole pieces. F ig. G is a side elevation of the same.

1n the drawings 10 indicates an upper pole piece, 11 a base or lower pole piece. Said pole pieces are engageable by opposite ends of bar magnets 12, of which four are shown. The base includes a pair of oppositely extending polar projections 13 which have pole faces 14 arcuate in transverse section and formed as continuations of the arcuate groove 15 in the upper face of the lower pole piece 11.

Suitably secured to and depending from the upper pole piece 10 there are a plurality of polar projections, two beingl shown hcrein, the larger being indicated by the numeral 1G and the smaller by the numeral 17. The polar projections 16 and 17 are formed of laminations suitably secured together as at i8. The polar projection 16 is reduced for a portion of .its length to cylindrical form (see F ig. 3) and mounts the cylindrical windings, 19 indicating the inner and primary winding and 2() the outer and concentric secondary winding'. No winding is shown mounted on the polar projection 17. In the space within the magnets and adjacent the polar projection 17 there is positioned a condenser 21. End plates 22 and 23 are suitably secured as at 24 to the upper and lower pole pieces. llate is apertured as at 24 to receive the cur t coi'iducting member 25.

Polar projection 16 terminates in a polar extrennity 26 having aI face 27 arcuate in transverse section and a wedge or dove-tail shaped lateral rejecting portion 28. Polar projection 17 has the polar extremity 29 provided with the arcuate pole face 30 and a lateral and oppositcly extending wedge or deve-tail shaped projection 31.

Suitable non-magnetic metal, such as die metal, includes anchoring portions 32 and 33, each having a key lock connection with the dove-tail or wedge projection, and portions 32 and 33 are united b v the side portions 34 which, however, are relieved a.' at Side portions 34 include circular openings in which a bearing member having a substantially annular rim 36 and a central. hub 37 is positioned on each side of the magneto within the end plates 22 and 23, said hub and rim being connected together by the web 38. The end plates bear on the peripheral rim36 and the hubs 37, being elongated, eX- tend thru the apertures 39 of said end plates. The apertures 39 are aligned and are coaxial with the axis of the bottom pole piece and upper pole projection faces. The bearings for the shaft 40 thus are internally positioned which permits of elongation to obtain substantially full length bearing for shaft 40. Intermediate the bearings and between the side connecting portions 34, shaft 40 mounts a laminated inductor 41, which is vane-shaped and has laterally flared eXtensions 42 for better magnetic operation. All of the polar faces and groove 15 are portions of the same circle, the remainder thereof being completed by the arcuate surfaces 43 intermediate space of the die metal which form a substantially lcomplete circular chamber in which the laminated rotor 41 and sha-ft 40 are mounted, said shaft and inductor being capable of rotary or oscillatory movement, as desired.

The usual practice in the construction of magnetos having polar projections, such as 16 and 17, has been to surround said projections completely with a non-magnetic metal which is usually a conductor of electricity. In the present invention, the space or air gap indicated at 55 in Fig. 4, between the polar extremities 16 and 17, has been provided to not only extend throughout the between said projections but partially about one of said projections. Thus no path is provided for induced eddy i currents in the non-magnetic metal and the damping effect of such currents on the flux change in the polar projections is avoided. Thus, the advantage in providing a substantial air gap of the character described lies in y the avoidance of the damping effect due to the induced currents iiowing in the closed paths around said projections.

The side plates are extended as shown in Fig. 3 and prevent lateral displacement. of

' the magnets 12 as Well as securing the top and bottom pole pieces or yolres together. The magnets 12 are retained in engagement with the pole pieces by magnetic attraction and against accidental displacement by any suitable cover means not shown, which may, if desired, be secured tothe base thru suitable means associated with the threaded openings 45. Y

To lubricate the shaft bearings, the intermediate portion 38 is enlarged as at 46 to provide a central chamber 47 Vadapted to receive a cup 48 containing a spring 49 backing a wick 50. Lubrication is supplied to the chamber 47 by a passage 51 communicating at one end therewith and formed in the extension 53 projecting thru a hole 52 in the end plate, said extension including the oil conduit 54. Extension 53 since mounted in the opening 52, also prevents rotation of the bearing member.

The invention claimed is:

1. ln a magneto, the combination with a housing, a shaft extending therethrough, an inductor mounted on said shaft, of an annular bearing member' providedwith a supporting rim adapted to be supported within said housing, a radial web portion, and an elongated hub portion in which said shaft is rotatably mounted whereby said bearing will be supported within said magneto andV said magneto internally of said end plates,

said bearing member comprising an annular rim supported internally of said magneto, an inwardly extending radial web portion, an elongated hub portion for rotatably supporting said shaft. independently of said end plates and a projecting extension formed thereon and extending through one of said end plates for providing an oil passage to the bearing surface and preventing relative movement between said bearing member and end plate.

3. A magneto comprising a pair of polar projections mounted with their opposed faces in spaced relation with each other, a support therefor Aformed of non-magnetic metal partially surrounding the same and providing a free space intermediate the opposed faces and extending beyond the full width thereof so as to prevent circulation of induced'currents in the non-magnetic material betweenthe opposed faces whereby rapid changes in the magnetic flux leakage will be permitted, an inductor mounted in magnetic relation with said projections, a shaft upon which said inductor is mounted,

end plates partially enclosing said projections and inductor through which said shaft is adapted to project, and a pair of bearing members mounted internally of said magneto intermediate ksaid inductor and end plates for rotatably supporting said shaft.

In witness whereof, I have hereunto affixed my signature.

BENJAMN P. REMY.

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