US2299589A

US2299589A - Magneto rotor

Info

Publication number: US2299589A
Application number: US306567A
Authority: US
Inventors: Reis Adele
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-11-28
Filing date: 1939-11-28
Publication date: 1942-10-20
Anticipated expiration: 1959-10-20

Description

Oct. zo, 1942. C, F, REIS 2,299,589

MAGNETO ROTOR Filed Nov. 28, 1939 IIIA Patented ocf.zo,1e42 2,299,589

UNITED STATES PATENT OFFICE MAGNETO ROTOR Curt F. Reis, New York, N. Y.; Adele Reis executrix of said Curt F. Reis, deceased Application November 28, 1939, Serial No. 306,567

4 Claims. (Cl. 171-209) The present invention relates to rotors for Figure 6 is a transverse sectional view through magnetos of the type employing permanent maga rotor in which the pole shoe laminations have nets, and has for its primary object to generally been omitted, improve such structures. Referring to the drawing in more detail and A further object of the invention resides in particularly to Figures 1 to 5 inclusive, the the construction of a rotor in which the magnet numeral I indicates a conventional steel shaft extends transversely of the rotor shat and has on which the rotor parts are mounted and adaptits major axis extending through the axis of the ed to have its ends rotatably mounted in the sham casing of the magneto. Diametrically opposite A further object or the invention resides in 10 portions 2 of the shaft are preieraoly flattened providing a rotor with a sectional magnet, the to provide interlocking connections with the rotor sections of which may be formed of cast metal proper in a manner which will later appear. and yet which need not be machined to provide The rotor depicted in Figures 1 to 5 inclusive the required Contact between the meeting faces S O the bipolar type, and the magnet Whleh iS of the sections. generally indicated by the numeral is mounted Another object of the invention consists in With its major axis passing through the axis of binding together in intimate contact the sections the Shaft The magnet 3 iS Composed of two of the magnet by the shrinkage of an

aluminum sections

4 and 5 which are identical in form. or other metal jacket which partly surrounds the These sections 4--5 are formed of cast metal and assembled magnet sections. extend substantially the entire length oi' the Another object 0f the invention resides in rotor. It will be understood therefore that the drawing laminations or pole shoes into intimate magnet comprises a relatively large mass of metal contact with the poles of the magnet by the and has a correspondingly high coercive force. shrinkage of a cast aluminum or other metal Moreover, by reason of the fact that the sections jacket; on the rotor, of the magnet are formed of cast metal it will be A further object of the invention consists in readily understood that the size of the magnet securing the laminations of each of the pole shoes sections and likewise the magnetic volume may in intimate contact with each other without the be easily varied to suit varying requirements. In use of rivets, thereby avoiding the creation of the embodiment of the invention illustrated the eddy currents and correspondingly increasing the 'so' outer faces of the magnet sections are provided magnetic value of the magnet. with

bulges

4 and 5 to increase the mass of the Another object of the invention consists in promagnet and likewise its coercive force. viding bulges on the exterior sides of the magnet The inner faCeS 0f the magnet sections are sections so as to increase the mass of metal in the llrleferebly provided With nelned glOOVeS 5 magnet without unduly increasing the diameter These grOOVeS are adapted t0 receive cast alumiof the rotor, and thereby increasing the coercive num or other non-magnetic metal for locking the force or magnetic Value of the magnet, magnet sections in position, as Will be later de- A further object of the invention resides in a scribed, and the inelnation of the grooves is such novel construction by which the body of the rotor as to cause the sections to be drawn tightly t0- is anchored or locked to the rotor shaft to pre- 40 gethervent relative movement between these elements. The

sections

4 and 5 comprising each rotor Other objects and advantages of the invention magnet are mounted on the shaft l as indicated will be apparent from the following description in Figure 3, but before being so installed their when taken in connection with the accompanying contiguous faces are coated with steel cement 8. drawing, in which, By this means an intimate magnetic contact be- Figure 1 is a perspective view of the rotor. tween the tWO SeCtOnS Of the magnet is provided Figure 2 is a longitudinal sectional View thereof without the expensive Step of machining the sides taken through the magnet. to provide an accurate mechanical contact.

Figure 3 is a transverse sectional View taken The magnet 3 iS Preferably provided with on line 3--3 of Figure 1. 50 laminated pole shoes 9. The conguration of the Figure 4 is a longitudinal sectional view taken laminations is best shown in Figure 3. Each on line 4-4 of Figure 3. lamination includes an inwardly directed tongue Figure 5 is a perspective View of one of the l0 Which has a notch Il formed in each of its sections of the magnet shown in Figures 1 to 4 opposite edges, and the ends of the laminations inclusive, and are beveled as indicated by reference numeral l2.

ing the sections with their inner faces in abutting relationship. The grooves 6 are arranged in inclined positions, and it will be obvious that the shrinking of the aluminum as it cools will cause the magnet sections to be drawn tightly together and into intimate contact with the steel cement 8.

The molten aluminum also enters the grooves Il formed in the edges of the tongues Il! of the laminations, and in this instance also the shrinking of the cast metal as it cools will cause the laminations to be drawn into intimate engagement with the ends of the magnet 3. The cast metal also holds the laminations of each pole shoe in intimate contact, thus avoiding the use of rivets for that purpose, thereby preventing the 4creation of eddy currents and correspondingly increasing the magnetic value of the magnet.

The flattened portions 2 on the shaft l cooperate with portions of the magnet to form elongated channels of segmental cross-sectional shape, and the molten aluminum enters these channels and serves to rigidly anchor the rotor body to the shaft.

The die in which the assembled parts is placed is preferably shaped to provide the integral discs I of aluminum, the hubs l5, and a covering IS for the outer side walls of the magnet sections and the ends of the pole shoes.

In the modified construction shown in Figure 6 the sectional magnet 20 is identical with that shown in Figures 1 to 5 inclusive, except that the laminations have been omitted and the sections of the magnet are therefore longer and provided with' rounded ends. The means for binding the sections of the magnet together, etc., are identical with those shown in the construction previously described.

From the foregoing description taken in connection with the accompanying drawing it will be apparent to those skilled in the art that I have devised a novel construction of magneto rotor in which the axis of the magnet extends transverse- 1y of the rotor shaft; that the magnet sections Iare intimately bound together in such a way that any machining operations are rendered unnecessary; that the pole shoes are drawn into intimate contact with the poles of the magnet by the shrinking of the cast aluminum; that the bulges formed on the outer Walls of the magnet sections increase the mass of the magnet and consequently its coercive force, and that the cast non-magnetic metal which binds the magnet sections and pole shoes also locks the body of the rotor to the shaft so as to prevent relative movement between the parts.

In accordance with the patent statutes I have described what I now believe to be the preferred form of the invention, but it is to be understood that various changes may be made in the details of construction without departing from the spirit of the invention, and it is intended that all such changes be included witliin the scope of the appended claims.

What is claimed is:

l. A rotor for magnetos comprising a drive shaft, a sectional magnet composed of two Sections of magnetic material, said sections being disposed on opposite sides of said shaft in contact with each other and having inclined notches in their adjacent faces, and a body of cast nonmagnetic material interlocking with the walls of said inclined notches to draw the sections into intimate contact.

2. A rotor for magnetos comprising a drive shaft, a magnet mounted on said shaft and having central recesses in its opposite ends, pole shoes for the ends of' the magnet, inwardly eX- tending projections formed on the pole shoes midway between their ends and situated in said recesses, and a body of cast non-magnetic interlocked with the projections on the pole shoes for holding the latter in intimate contact with the poles of the magnet.

3. A rotor for magnetos comprising a drive shaft, a magnet mounted on said shaft and having central recesses in its opposite ends, pole shoes for the ends of the magnet, inwardly ex- .l tending projections formed on the pole shoes midway between their ends and having notches in their side walls, said projections being mounted in the recesses in the magnet, and a body of cast non-magnetic material interlocked with the ,notches in said projections for holding the pole f` shoes in intimate contact with the poles of the magnet.

4. A rotor for magnetos comprising a drive shaft, a sectional magnet composed of two sections of magnetic material, said sections being disposed on opposite sides of said shaft in contact with each other and having inclined notches in their adjacent faces, each end of said magnet being formed with a recess in communication with the inclined notches, pole shoes for the ends of thel magnets, inwardly extending projections formed on the pole shoes and situated in the recesses, and a body of cast non-magnetic material interlocked with the projections on the pole shoes and with said recesses.

CU'RT F. REIS.