US1558095A - Dynamo-electric machine - Google Patents

Description

Oct. 20, 1925.

F. KRATZ ET AL.

pYNAuo ELECTRIC MACHINE Patented Oct. 20, 1925., UNITED STATES FRANZ KRATZ ANDJILAX SCHAFER, OF STUTTGART, GERMANY, ASSIGNORS TO THE 1,553,095 PATENT OFFICE. v

FIRM: ROBERT BOSCH AKTIENGESELLSOHAFT, OF STUTTGART, GERMANY.

DYNAMIC-ELECTRIC MACHINE.

Application filed August 11, 1921. Serial No. 491,554.

T all whom it may concern: I

Be it known that we, FRANZ KRATZ and Max SCHSFER, both German subjects, residing at Stuttgart, Germany, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.

The present invention relates to improvements in dynamo electric machines of the type serving as a source of continuous current and also simultaneously as a magnetoelectric ignition device.

In the endeavor to simplify as far as possible the electric equipment of motor vehicles, efforts have already been made to combine the dynamo electric machine for the electric lighting of the vehicle with the magneto ignition apparatus, into a single unit. In this case either the ignition apparatus and the dynamo machine are arranged one above the other or the two machines lie axially one behind the other. In both cases they have a common drive and their casings merge into one another in such a Way that the construction from the outside appears as a continuous whole.

The improvements of this invention are directed to that ty e of construction in which the two machines lie axially of one another. The constructions hitherto known of this type are of great length because the dynamo and the ignition apparatus are simply placed one behind the other, as they appear in their usual form, whilst of course a clutch or transmission gear is also inserted between the two machines.

According to this invention a substantial shortening of the total length. of such a con struction of dynamo and i ition apparatus is obtained by the rotor o the ignition apparatus being keyed on to an extension of the dynamo shaft.

If desired, the entire dynamo shaft may be supported only in end bearings, by whic arrangement the two bearings for the rotor, which are necessary in an ignition apparatus arranged axially behind the dynamo but independently thereof, are saved and the apparatus shortened by the width oi at least two -bearings. Ina preferred embodiment of the invention, illustrated in the accom- "rianying drawings, and later to be referred Zto, however, the usual bearings for the dyna- .Il'lO shaft, are retained and one additional ,Q'T'Lbearing provided ,.{an nd bearing for .the

extension of the dynamo shaft. By this arrangement, the construction is shortened by the width of at least one bearing over the ordinary arrangement in which the ignition apparatus is arranged axially behind the dynamo but independently thereof.

The foregoing advantages are obtained without sacrificing any desirable feature of construction or of operation of the ignition apparatus. It is immaterial, for example, whether the armature, the field magnets or a cage formed of segmental flux guiding pieces be keyed on to the dynamo shaft to serve as the rotor of the ignition apparatus.

For automatic adjustment of the sparking point, a centrifugal governor may be arranged on the dynamo shaft between the dynamo armature and the rotatably mounted rotor of the ignition apparatus, which governor controls the'conta'ct breaker or in certain cases also the distributor.

The invention is more particularly described with reference to the accompanying drawings, in which,

Fig. 1 shows diagrammatically in plan View one form of our'invention, including an armature non-revoluble except by manual operation for the purpose of adjusting the sparking point;

Fig. 2 shows diagrammatically in plan view another ,form of our invention, embodying an automatically operating means for adjusting the sparking point.

In both embodiments of the invention shown in Figs. 1 and 2, the dynamo electric machine comprising the armature l and the field. 11, which is preferably arranged to provide lighting current, is driven directly or indirectly from the crank shaft of the engine. The rotor of the ignition apparatus or machine, in the present case a magneto arrangement 3, is keyed on to an extension of the shaft 2 of the dynamo machine so as to rotate with that shaft' The stationary armature 4 is mounted in the casing 5 which encloses both machines.

In the embodiment of the invention illustrated in Fig. 1, the armature 4: is adapted to be revolved throu h a certain angle by means of a handle 6 %or the purpose of adjusting the sparking point. This handle is also to be used for the same purpose in the construction shown in F ig. 2, as there indicated.

The contact breaker, distributor and consparking point is effected automatically by means of a centrifugal governor.

In Fig. 2 the contact breaker and the distributor are shown diagrammatically at 8, driven by a shaft 8' disposed transversely to the extended dynamo shaft 2. The end of the shaft 8 adjacent the extension of the dynamo shaft 2, has a worm gear 10 mounted thereon, in engaging relation with a worm gear 11 mounted on the shaft 2, the gear 11 constituting the driving-gear element.

The gear 11 is in the form of a sleeve surrounding the shaft 2 and suitably mounted thereon, for example as by a spline, to partake of rotary movement therewith and yet permit of an independent adjusting movement of this gear 11 longitudinally of the shaft 2, under the influence of the centrifugal governor.

The gearing and the governor, as shown, are arranged upon the shaft 2, between the rotor 3 of the ignition apparatus and the bearing 9 of the dynamo machine 1, and hence the entire arrangement is one of extreme compactness.

The governor, as diagrammatically shown in Fig. 2, comprises a cu 7 fixedly mounted upon the ri ht hand end (as the arts are viewed in Fi 2) of the gear-s eeve 11, a plate 12 fixedly mounted upon the shaft 2, and balls 13 freely positioned between the plate and cup and adapted to move outwardly from the shaft 2 under centrifugal action along the curved interior of the cup toward the rim thereof. Such movement of the balls in an obvious manner imparts a longitudinal sliding movement of the gearsleeve 11 along the shaft 2 toward the left (as the parts are viewed in Fig. 2), under the resistance of the spring 14, the spring tending to return the parts to their initial position shown in Fig. 2.

The adjusting movement 'of the gearsleeve 11 under the operation of the governor, referred to above, obviously produces a partial rotation of the shaft 8' independently of its normal driven movement, which provides the desired adjustment of the sparking point for different speeds of rotation of the'driving shaft.

It will be understood, of course, that the driving means for the distributor and contact breaker, illustrated in Fig. 2, may be employed without the governor or automatic adjusting means, the manual adjustment of the armature 4 by the handle means shown more particularly in Fig. 1, then being relied on to adjust the sparking point. lVhen the governor adjustment is not employed, it. will also be understood that the gear sleeve 11 is keyed instead of splined on. the shaft 2 so as to rotate with that shaft without any movement longitudinally of the shaft.

Various modifications may be made in the arrangement of the parts, including the cooperative arrangement of the armature, field magnets, contact breaker, condenser, distributer, etc. within the scope of our invention and realizing its advantageous features. For example, the armature 4 of the ignition apparatus, instead of the magnet system 3 as shown, may be keyed to the dynamo shaft 2 to rotate therewith. In such case, the contact breaker, condenser and distributor may be disposed in fixed positions, such as diagrammatically illustrated by the positions of the contact breaker and distributor in Fig. 2, with conductors such that the, primary current is conveyed through a contact brush from the armature of the ignition apparatus to the contact breaker, condenser and distributor. Or, the contact breaker and condenser may be arranged to rotate with the armature, in which arrangement they may be connected'with the armature by fixed conductors, a feature preferred by some in ractice. This feature of a fixed conductor tween the armature and the contact breaker and condenser may also be retained when a flux conductin cage serves as the rotor of the ma neto e ectr1c ignition apparatus. In all 0 these variations the compact unitary assembly of the two devices, the dynamo electric machine and the ignition apparatus, illustrated in Figs. 1 and 2, may be utilized and the advantages of the invention realized.

We declare that what we claim is 1. Combined direct current and high tenvsion ignition current generator, comprising,

in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said shaft having an extension overhanging one of said bearings, a magneto-electric ignition device provided with a rotor, the rotor of said ignition device being mounted on the said extension of the armature shaft- .so as to rotate therewith.

2. Combined direct current and high tension ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said shaft having an extension" overhanging one of the said bearings, a magneto-electric ignition device comprising a normally stationary armature and a rotary magnetic field surrounding said armature and mounted on the said extension of the armature shaft so as to rotate therewith.

3. Combined direct current and high tension ignition current generator, comprising, in combination, .a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said'shaft having an extension overhanging one of the said bearings, a magneto-electric ignition device comprising a normally stationary armature and a rotary annular magnetic field surrounding said armature andmounted on the said extension of the armature shaft so as to rotate therewith.

at. Combined direct current and high ten sion ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said shaft having an extension overhanging one of the said bearings, and a magneto-electric ignition device comprising a normally stationary but rotatably adjustable armature and an annular magnetic field surrounding said armature and mounted on the said extension of the armature shaft so as to rotate therewith.

Combined direct current and high tension ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said shaft having an extension overhanging one of the said bearings, a iiiagneto-electric ignition device, comprising a rotor mounted on the said extension of the said armature shaft so as to rotate therewith, a circuit controller, a driven shaft for actuating said circuit controller and means for driving the said driven shaft from the said armature shaft of the direct current generator.

6. Combined direct current and high tension ignition current generator, comprising, in combination, a .field structure and an armature for generating direct current of low tension, a shaft for the said armature and bearings supporting said shaft, said shaft having an extension beyond said armature and overhanging one of said bearings, a magneto-electric ignition device compr1sing a rotor mounted on the said extension of the said armature shaft so as to rotate therewith, a contact breaker and distribu 7. Combined direct current and high tension ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of U low tension, a shaft for the said armature and bearings supporting said shaft, said shaft having an extension beyond said armature and overhanging one of said bearings, a magneto-electric ignition device, comprising a rotor mounted on the said extension of the said armature shaft so as to rotate therewith, a contact breaker and distributor ing a rotor mounted on the said extension I.

of the said armature shaft so as to rotate therewith, a contact breaker and distributor device, gearing members arranged on the said extension of the armature shaft for driving the said contact breaker distributor device, and centrifugal governor means arranged to receive its motion from the armature shaft for adjusting the position of the said contact breaker and distributor device relative to the armature shaft for timing the point of ignition.

9. Combined direct current and high tension ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature having an extension beyond said armature, amagneto-electric ignition device comprising a rotor mounted on the said extension of the said armature shaft so as to rotate therewith, a contact breaker and distributor device,

gearing members arranged on the said exd contact breaker and distributor device, and centrifugal governor means foradjusting the position of the said contact breaker and distributor device relative to the armature shaft for timing the point of ignition; said centrifugal governor means being arranged between the said armature and the said gearing members.

10. Combined direct current and high tension ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said shaft having an extension overhanging one of the said ttaiision of the armature shaft for driving the a bearings, a magneto-electric ignition device comprising a rotor mounted on the said extension of the said armature shaft so as to rotate therewith, a contact breaker and distributor device, gearing members arranged on the said extension of the armature shaft for driving the said contact breaker and distributor device, and centrifugal governor means for adjusting the position of the said contact breaker and distributor device relative to the arn'iature shaft for timing the point of ignition, said centrifugal governor means being arranged on the extension of the said armature shaft between the said bearing and the said rotor.

11. Combined direct current and high tension ignition current generator, comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for the said shaft, said shaft having an extension overhanging one of the said bearings, a magneto-electric ignition device comprising a fixed armature and a magnetic field surrounding said armature and mounted on the said extension of the said armature shaft so as to rotate therewith, a contact breaker and distributor device, gearing members arranged on the said extension of the armature shaft for driving the said contact breaker and distributor device, and centrifugal governor means for adjusting the position of the said contact breaker and distributor device relative to the armature shaft for timing the point of ignition, said centrifugal governor means being arranged on the extension of the said armature shaft between the said bearing and the said magnetic 'field.

12. Combined direct cnrr'ent and high tension ignition current generator, comprising,

in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature and bearings supporting said shaft, said shaft having an extension beyond said armature and overhanging one of said bearings, a magneto-electric ignition device comprlsmg a rotor mounted on the said extension of said armature shaft so as to rotate therewith, a circuit controller comprising relative stationary and rosative parts, means for driving the said'rotative parts from the said armature shaft of the direct current generator, and means for adjusting the position of certain of said parts relative to the armature shaft for timing the point of ignition.

13. Combined direct current and high tension ignition current generator comprising, in combination, a field structure and an armature for generating direct current of low tension, a shaft for the said armature, bearings for said shaft, said shaft having an extension beyond said armature and overhanging one of said bearings a magnetoelectric ignition device comprising a rotor mounted on said overhanging armature shaft-extension, a contact breaker and distributor. device gearing members connected with said armature-shaft extension for driving said contact breaker and distributing FRANZ KBATZ. MAX soHAFER.

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