US2020078A

US2020078A - Magneto generator

Info

Publication number: US2020078A
Application number: US721746A
Authority: US
Inventors: Edward B Nowosielski
Original assignee: Bendix Aviation Corp
Current assignee: Bendix Aviation Corp
Priority date: 1934-04-21
Filing date: 1934-04-21
Publication date: 1935-11-05
Anticipated expiration: 1952-11-05

Description

Nov. 5, 1935. E. B. NOWOSIELSKI 2,020,078

' MAGNETO GENERATOR Filed A rii 21, 1954 2 Sheets-Sheet 1 VENTOR LUJIIws/s M W M A ORNE) Nov. 5, 1935. E. B. NOWOSIELSKI 2,020,078

MAGNETO GENERATOR Filed April 21, 1934 2 Sheets-Sheet 2 w VENTOR w I BY fidwavd/fl. A 7%;

Patented Nov. 5, 1935 UNITED STATES MAGNETO GENERATOR mesne ts, to

Edward B. Nowosielski, Sidney, N. 1.. alsignor, by

Bendix Aviation Corporation, South Berni, Ind, a corporation otDela- Appiicationbprii :1. 1 934 Serial No. 121,140

scum.

The present invention relates to a magneto generator and more particularly to a high tenslon magneto adapted to furnish ignition current for internal combustion engines.

It is an object 01' the present invention to provide a novel high tension magneto generator which is eflleient and reliable in operation and simple and economical in construction and asaembly.

Itisanotherobjecttoprovidesuchadevice which is especially adapted for operation at high rotative speeds. a

It is a further object to provide such a device which embodies a single coil, breaker mechanism and condenser, with a novel arrangement for furnishing ignition for an engine having more than one cylinder.

It is another object to provide such a device in which a distributor for the high tension current is built into the rotor of the magneto.

It is another object to provide such a device in which the engine flywheel. the rotating magnet, the breaker cam and distributor ring are all incorporated in a single rotating unit so that ther is only one rotating part in the device.

Further objects and advantages will be apparent from the following description taken in conntfition with the accompanying drawings in w ch:

Fig. 1 is a perspective view of a preferred embodiment of the device with the rotor removed from the housing in order to expose the parts;

Fig. 2 is substantially an axial section 01' the device;

' Fig. 3 is a sectional detail an output terminal member; a

' Fig. 4 is a diagrammatic illustration of the high tension electrical circuit showing the distributor in position to connect one output terminal member with the high tension terminal of the coil; and

Fig. is a view similar to Fig. 4' showing the distributor rotated through 180 degrees so as to connect the other output terminal to the coil..

Referring first to Fig. 2 of the drawings, there is illustrated a shaft 1 which may be the extended crankshaft of the engine for which the magneto is to furnish ignition, or which may be directly coupled thereto. Shaft l is journalled by means of a suitable bearing structure indicated at 2 in a housing 3 which is arranged to be mounted in any suitable way with provision for rotary adjustment on the engine casing, not shown.

A rotor indicated generally at l is keyed on the end of the shaft l as shown at 5, and is suitably-retained thereon as by means ota nut 6. Rotor4comprisesadiscmember1whichmaybetheengineflywheelandwhichisarranged to carry all the rotating elements of the magneto comprising the magnet structure indicated gen- 5 erally at 8 (Fig. 1), the breaker cam I and the distributor ll.

The magnet structure comprises straight cylindricalbarmagnets l2 arrangedinpairsonopposite sides 01 the axis of the rotor. Like poles or the magnets l2 are received in openings l3 in arcuate pole pieces ll whereby the magnets are held in assembled position, and pole pieces ll are retained by check pieces l5 and It or non-magnetic material having shoulders II and it 00- operating with rabbets I! and 2| at the edges of the pole pieces. The magnet assembly is mounted on the flywheel l by means 0! rivets 22, the cheek piece It being arranged to space the magnet structure sufliciently from the flywheel to magnetically insulate the same. This orrangement permits the flywheel to be made from magnetic material such as steel capable 01 withstanding the stresses set up by rotation at high speeds.

The cheek piece I i is preferably formed to provide the breaker cam structure 9 integral therewith although the can! may of course be formed as a separate element fixed thereto ii deemed desirable.

A stator comprising arcuate pole shoes 24 and 25 and a connecting core member 25 (Fig.2) is mounted in the housing 3 as by means of rivets 21 and spacing members 23. The pole shoes 24 and 25 are arranged with their inner surfaces concentric with the pole pieces I of the rotor magnet whereby rotation of the magnet causes reversals of flux throughthe

external magnet circuit

24, 28, 25.

\ An induction coil 29 is mounted on the core 26 and is provided with the usual primary coil 3! and secondary coil 32 having a high tension terminal 33. One end of the primary coil is grounded in the usual manner, and the opposite end is connected by a lead 34 to the ungrounded terminal 35 of a condenser 36, and by a lead 31 to a breaker mechanism including an insulated breaker arm 38. The breaker arm comprises a cam follower 39 adapted to cooperatewith the breaker earn 9 and thereby cause contact on the breaker arm 38 to engage and disengage an adjustable grounded contact 42. r

The magneto here illustrated is adapted to furnish ignition for a two cylinder engine, and two

output terminal members

43 and 44 are thereiore provided fori'urnishing connections to the spark plug cables of the engine, not illustrated. The

output terminals are preferably constructed as 45 thereof are positioned substantially in the same transverse plane as the high tension terminal 33 of coil 29 and at the same radius from the axis of the rotor. I

In order to periodically connect. the

output terminals

43 and 44 with the high tension terminal 33 of the coil, a distributor structure is provided comprising a block of insulating material 48 mounted in a circular recess 49 in the flywheel I, and arcuate conductors and 52 embedded in the insulating block in position to engage or substantially engage said terminals and form electrical connections therebetween at certain angular positions of the rotor.

By reference to Fig. 4, it will'be seen that at one angular position of the rotor the distributor conductor5l connectsthe high tension coil termi-' nal 33 with the output terminal 43, and when the rotor has turned through 180 degrees as shown in Fig. 5, the other rotor conductor 52 serves to connect the coilterminalwith the output terminal II. It will be understood that the distributor conductors 5| and 52 and the

breaker cam mechanism

9, 39, etc.. are so arranged as to cause the primary oi the induction coil to be broken, and the high tension circuit to be closed at the proper angular positions of the rotor magnet with respect to the pole shoes 24 and 25 to secure the optimum result. It will be understood that the housing '3 may be rotarlly adjusted as by, means of a handle 53 to adjust the timing or the ignition in accordance with the operation of the engine.

Although but one embodiment of the invention has been shown and described in detail it will be understood that other embodiments are possible and various changes may be made in the details and arrangements 01 the parts without departing from the spirit of the invention as defined in the claims appended hereto.

What is claimed is: r

1. In a high tension magneto generator for internal combustion engines a housing, a rotor journalled therein including a permanent magnet and forming a closure for the housing, a stator in said housing including pole shoes adapted to cooperate with the rotating magnet and an induction coil having a high tension terminal, in-

sulated output terminal members in said housing and means on said rotor for periodically providing an electrical connection from the coil terminal to said output terminals.

2. In a high tension magneto generator for internal combustion engines a housing, a rotor journalled therein including a permanent magnet and forming a closure for the housing. a stator in said housing including pole shoes adapted to cooperatewiththe rotating magnet and'an induction coil having a high tension terminal, insulated output terminal members in said housing, said rotor having conducting means mounted thereon for connecting the coil terminal to said output terminals at predetermined angular positions of said magnet.

3. In a high tension magneto generator for internal combustion engines a housing, a rotor journalied therein including a permanent magnet and a breaker cam, a stator in said housing including pole shoes adapted to cooperate with the rotating magnet and an induction coil having a high tension terminal, means including a cam follower on the housing for periodically breaking the primary circuit of the induction coil. 5 insulated output terminal members in said housing having contacts located substantially in the same transverse plane as the coil terminal, and insulated conducting segments carried by said rotor and arranged to connect the coil terminal with theoutput terminals at predetermined angular positions of the magnet with respect to the stator pole shoes.

4. In a magneto generator for internal combustion engines a housing, a rotor journalled therein including an engine flywheel, a permanent magnet non-magnetic means rigidly connecting the magnet to said flywheel in spaced relation thereto and a breaker cam mounted coaxially thereon, a stator including pole shoes and a connecting core member with an induction coil thereon fixed to the housing and spaced therefrom in position to cooperate with the rotating magnet, a cam'iollower pivoted in, the housing in position to cooperate with the breaker cam, means including contacts operated by said cam follower to open and close the primary circuit of said coil, output terminal members mounted in spaced relation in said housing and means on said rotor for periodically connecting the output terminal members to the high tension terminal. of said coil.

5. In a magneto generator for internal combustion engines a housing, a rotor journalled therein including an engine flywheel, a permanent magnet non-magnetic means rigidly connecting the magnet to said flywheel in spaced relation thereto and a breaker cam mounted coaxially thereon, a stator including pole shoes and a connecting core member with an induction coil thereon fixed to the housing and spaced therefrom in position to cooperate with the rotating magnet, a cam follower pivoted in the housing in position to cooperate with the breaker cam, means including contacts operated by said cam follower to open and close the primary circuit of said coil. output terminal members mounted in spaced relation in said housing, said flywheel having a circular recess, and arcuate conductors fixed in said mess insulated'irom the flywheel adapted to cooperate periodically with the high tension terminal of said coil and said output terminal members.

6. In a magneto generator for internal combustion engines a unitary rotor element including an engine flywheel and a permanent magnet fixed thereto, a stator including an induction coil having a high tension terminal and arranged to be energized by rotation of said magnet, said flywheel having a circularrecess, a block of insulating material fixed in said recess, stationary output terminals having contacts arranged substantially in a circle with said coil terminal about the rotor axis, and arcuate conductors mounted on said insulating block arranged to connect said output terminals to said coil terminal at predetermined angular positions of the rotor.

7. In a high tension magneto generator for internal combustion engines a housing, a rotor journalled therein including an engine flywheel, 7

. a permanentmagnet and a. breaker cam, a stameans including a cam follower on-the housing for periodically breaking the primary circuit of the induction coil, insulated output terminal members radially disposed in said housin said .flywheel having arcuate conducting means positioned thereon for selectively connecting the coil terminal to said output terminals in sequence when the primary circuit of the coil is broken.

8. In a magneto generator for internal combustion engines a unitary rotor element including an engine flywheel, a permanent magnet, non-magnetic means for rigidly mounting the magnet on the flywheel in spaced relation thereto, a stator including an induction coil having a high tension terminal and arranged to'be energized by rotation of said magnet, output terminals having contacts arranged substantially in the same transverse plane as said coil terminal, arcuate conductors on said flywheel insulated therefrom for periodically forming an electrical connection between said high tension coil terminal and said output terminals in sequence.

EDWARD B. NOWOSIELSKI.