US1677762A - Motor-assembling fixture - Google Patents

Description

July 11.; -1928.

R. o. GILBURG uoron Assmmuo FIXTURE Filed July 5, 1927 2 Sheets-Sheet 1 July 17, 1928.

R. O. GILBURSI` uoon AssEuBLING FX'UR Filed July 5,- 1927 2 Sheets-Shoot 2 ,1 I l y| Patented July 17, 1928.

UNITED STATES PATENToFFIcE.

ROY O. .GILBURGy 0F WAUSAIR WISCONSIN, .VASSIGNOR TO MARATHON ELECTRIC MFG. CO., OF WAUSAUQ'WISCONSIN, CORPORATION OF WISCONSIN,

Moron-ASSEMBLNG' FIXTURE.

Applicationrled July 5, 1927i Serial No. 203,428.

The invention relates to improvements in means for manufacturing motors, more especially small size, ring frame motors having laminated cores. A

Heretofore in manufacturing such motors, the inside of the ringframe wasI machined, and the stamped laminations of the stator core were pressed intoposition.4 By the use of this invention, the machining is `obviatfe'dgby clamping the core-in proper relation with the ring frame, and then casting low fusing metal preferably in strips into space between the core and the frame to anchor the core in position.

The main objects of this invention arey to provide a fixture for Yholdingthe respective parts of theY motorTin/proper relation for thecasting operation;` to 'provide a holding fixture in which'the mold may be formed in a simple manner; to 1 provide \.means for holding the `laminated core under pressure during the `casting operation; to provide `means'whereby the motor parts canxbe easily removed from the fixture after the Acasting is completed andto provide means for, facilitating the `casting operation in general and also securing the requisite accuracy, so as to reduce the cost of the motor.

An illustrative embodiment ofy this invention is shown in the accompanying drawings 'in which: f Y

Figure 1 is a plan view of the fixture with the motor parts in place, as it appears just after the casting operation has been completed.- The square stem ofthe fixture is shown in section, parts'are brokenaway, and parts are shown'in section. s l *'Fig.-2 isa section'takenmon the line 2-2 ofFiglg `i I f Fig. isn awfragmental 'section taken on `tl'ni line 3`-3 ofr'Fig. 1. Y Fig. 4 is taken lon the line 1l4 of Fig. 1. Fig;- 5 is an' elevation bf'thernotor Aframe 'with the core in positi'oivl` i Fig. 6fis a longitudinal 'section Villustrating the -completed tor, shown for the purpose of explaining the uses ofthis invention. r*Fig 7 is ar section "on "theline,172-7` of rig. 5. y. '1

jFigJB'is taken? onthe'lineSi-S OfFig. Y5. Referringltofthe drawings, the motor frame consists of y A central 'fring frame 1, y'in' the "open 4ends "ofA which are secured, by meansxcf` screws 2the end frames 3 and fi. The stator core 5 is rigidly mount stator core is .which rests on the bed'V or abutment member of the` press, and is lprovided with a cylin- ,ring fra-me. For straightemng up the mountedv in the fiange 18.

ed in the ring frame 1, and the rotor 6 is rigidly mounted on the motor shaft 7l which is rotatably mounted in the bearings 8, the bearings being centrally located in the end frames 3 and 4. l

In order tov secure efficiency inthe performance of the motor, it isnecessary thatv the rotor shall fitclosely within the stator core, and be evenlyv spaced therefrom at all points. Therefore, in the manufacture, the first cast in place in the rough ringframe, and then the ends of said frame are machined with reference to the `boreof the core to receive the end frames which are machined toconform with the, machined 70 surfaces in the ring frame so that the'end bearings are co-aXial with `the bore of a stator core when the motor is assembled.

For mounting the stator core in the frame 1, before the frame has been machined, I 7 provide a fixture which comprises, as shown in the drawings, a base 9, an arbor 10, and

or cover member'll. The base 9 consists of a circular disk drical center post 12. Three brackets ltare secured tc'the upper surface of the-base on which are provided 'the locating pads 15. The brackets are, of course, equally spaced from each other and from the center post, and the pads provide a three point support for ythe ring frame 1 when the latter is in place'in thev fixture. f

VThe arbor 101fits slidably on'the post, and is provided with a key slot 16 in which the key 17, fixed in the postyis engaged to hold the arbor against rotation. A flange 18is provided on the lower end of the arbor, which seats on the'same pads 15 which support the slots in` the stator core 5, the four posts 19 are yfixedly l These posts :are fiattened on rthe opposite sides to fit slidably inthe core slots. lV

The core laminaticns are first stacked, and then pressed on' the arbordown to the flange 18, This alines the laminations on the inner diameter so that a smooth bore is obtained `in the core.' The inaccuracies in the -laminations are thereby forced to the outer surface of the core, and no grinding is required. After the core is pressed on the arbor, the arbor is placed en the center post lm are cast the ridges 28 to provide metal tor 12, with the flange resting on the pads 15. The rough casting of the ring frame 1 is then slipped down over the flange to also resten r.the pads, so that the core is properly positioned in rela-tion to the frame.

On the inner circumference ot the trame receiving the threaded ends of the cap screws 2. The anchoring lugs 24 are also provided, located near the middle of the bore ot theA casting. When the frame is placed on the fixture, the ridges 23 and the lugs 24 are inserted 'between rods 25 and 26 whichy are arranged in pairs and iixedl-y secured in Vthe arbor flange 18 so as to project i-nto the annular space between the periphery of the core and the frame. The dialnetrical distances between the inner surface of the flugs 23 are gauged, and castings which will just slide easily over the core are used, accorrflingly the frame is roughly centered on the core by means ofthe lugs 23.

The cover member 11 is then placed in position. This member is recessed to fit snugly over the end ot the arbor 10 which projects beyond theV stack of laminations, and also provided with recesses lor loosely receiving the upper ends off the rods 19. The flan-ge 28, ot the member 11 fits inside the upper end of the ring frame to rest on thetop of the core, and the ram of the press enga-ges the npper end .ot the square ste-m 29 of the member' 11 to compress and 'hold lthe core underpressure, a latch 30 being provi-ded in the press for engaging the stem 11 to hold the laminations under pressure.

The'flavnge -28 is cutaway, as shown in Fig. 1, so that sand may be poured into the spaces between `the pairs of post-s 25 and 26. lThis lj'orms the sides of the molds, and the vends of the 4molds are formed by suitable recesses in the : flanges 18 and 28 oit the .members '10 and 11v respectively. Sprue holes 31 are provided in the flange V28, and vcommunicate with ,the upper portions of the corresponding molds.

then the work has been assembled on 4the fixture `an d clamped underpressureflow fusing metal, such as type vmetal or babbitt, .is vpoured into the Amold to -iiorm the anchoring strips 32 including the flanges :33 which ,project at veither side of fthe core for :holding the same laterally. y

When t-he metal is cooled, fthevcover member "171 is suddenly lreleased to break oflfth'e pouring gates in the sprue holes, and loosen the member.A The three hooks 34, 4which are lpivotally attached to the cover member, are lengaged under the frame and the arbor `flange '18.A then the vmember 111 is then raised, Athe 'arbor is drawn upwardly on the post y12. The supporting posts 35,. vwhich `are pivotally mounted -in the 'brackets 14,

are then swung in to Aengage Ithe r lower edge of lthe motor lframe 1. lVhenthe fixture is in this position, the cover member 11 is removed, and the ram of' the press engaged with the upper end of the arbor 10 to press the same out of the core. Therods 25 and I2.6 are Withdrawn with the arbor,

and the sand is removed and the motor parts ,are in assembled relation, ready for the nishing operations.

From the above 'description of the construction and operation ot' the device of my invention, it is apparent that the assembling opera-tions may be rapidly and ac-v curately performed, considerable expense is saved in constructing the motor, and the requisite accuracyV is secured. Y y

While but one specific embodment of this invention has been 'herein shown and described, i-t will be understood that details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined (by the following claims:

I claim:

`1. In a liXture for securing a laminated stator ring core Vinyplace in a. motor frame,`an arbor for receiving the core, a base for holding the arbor, the base having locating pads for positioning they frame in relation with the core, and rods mounted in pairs inthe arbor for projecting into .the annular space between the `core and the frame yso that the molds for cast-ing strips of metal in said space may be formed by pouring sand into the spaces between the .pairs of rods.

j v2. In combination in a fixture for securing a laminated .stator ring kcore `in place in a motor frame, a -base fhaving a post, la hollow arbor for the lcore removably mount-ed On -the post, the base having locating pads `for vsupporting the arbor'and ithe vmotor frame, means for forming molds for casting strips `of fmet'alfin the annular space between the vcoreeand the frame, a cover member-forcompressing the .core`0n the arbor, said cover ymember*having sprue holesfor pouring the metal into 4said molds.

3. In a iixturefforfsecuring a slotted :lamifnated lstator core ring in a motor'frame, an arbor for supporting t-he core in the fixture, ,and a post mounted in the arbor for projecting into one of the slotswfor alining theflaminations at thesides o-ffthe slots. j

. A; In an arbor-press fixture-for anchoring a laminated stator core ring in place ,in the .motor ring fra-me by casting strips of low fusing :metal between the :ringand kthe frame, a )base forresting .on the ,bed of the press, -the'base fhavinggfpads for supporting and locating the ring frame, an arbor for receiving the core, the -arborfhaving a bottom yflange yfor V:resting `on Vthe pads which support the iframe, 4pairs of rods loosely .mounted in the arbor flange and -projectiinginto the annular Vspace between the core and frame to form partitions for holding mold sand poured in- Ulf) lll)

y between the rods of each pair to form the anchor strips.

5. In an arbor press xture for anchoring a laminated stator core in a ring frame by casting strips of low fusing metal between the core and the frame, an arbor for receiving the core, the arbor having a bottom` flange for supporting the core, a base having finished pads for supporting the frame and the flange of the arbor, rods loosely mounted in the arbor and projecting into the annular space between the core and the frame to define casting spaces, and a cover member litting over the arbor and the core, said member having sprue holes for pouring molten metal into the casting spaces, said member and saidflange having recesses for defining flanges on the strips at the sides of the core to hold the core laterally.

Signed at Wausau, Wis".this 29th day of J une, 1927,

ROY O. GILBURG.

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