Патент USA US2295203код для вставки
Sept. 8, 1942. v. L. DARNELL 2,295,203 FIELD RING Filed Jan. 26, 1940 2 Sheets-Sheet l Sept, 8, 1942. v. L. DARNELL 2,295,203 FIELDD RING Filed Jan. 26, 1940 2 Sheets-Sheet 2 2,295,203 Patented Sept. 8, 1942 vUNITED STATES PATENT OFFICE 2,295,203 FIELD RING Victor L. Darnell, Dayton, Ohio, assignor to The Master Electric Company, Dayton, Ohio, a cor poration of Ohio Application January 26, 1940, Serial No. 315,812 6 Claims. (Cl. 171-252) views illustrating various forms of embodiment This invention pertains to electric motors, of the invention. Fig. 5a is a perspective view generators and the like, and more particularly of a fragmentary part of the form of the inven to an improved ?eld and brush ring assembly tion shown in Fig. 5. thereof. Like parts are indicated by similar characters Heretofore it has been customary to construct 5 of reference throughout the several views. motor housings of cast metal in three sections, In the drawings there is illustrated an electric comprising the opposite heads or end bells and motor, of which l-—l are the heads or end bells, an intermediate annular section which must be which are rabbeted to receive the intermediate bored to size to receive the stator or ?eld ring and brush ring and otherwise ?nished to ?t the 10 ?eld mounting section 2. Ordinarily the ?eld ring laminations are enclosed in an annular cast heads or end bells. Such operations not only add metal housing section which is relatively heavy to the cost of manufacture, but also materially and which requires sundry expensive machining increase the weight of the ?nished motor. rI‘he present construction and mode of manu operations to adapt it for use. In lieu of such heavy cast metal casing, the facture and assembly is designed to obviate the 15 assembly of stator laminations 3, in the present necessity for such heavy cast metal housing and instance, are surrounded by a welded band 4 minimize expensive machining operations, by of relatively thin plate or sheet metal, which is formingr a welded plate metal or sheet metal ring not only of less weight, but of greater tensile Within which the ?eld laminations have a tight press or shrink ?t, and by distorting limited 20 strength than the customary cast metal housing section, and will withstand hard usage with less areas thereof by relatively cheap punching or likelihood of breakage. The band 4 is rolled and spinning operations or by welding stops therein welded closely to size, whereby the laminae will to afford suitable abutments for brush ring loca be secured therein with tight press or shrink ?t, tion. The object of the invention is to improve the 25 without preliminary machining. It is customary to assemble in the same motor construction as well as the means and mode of section a mounting ring 5 for commutator assembly of dynamo electric machines, whereby brushes, which is ordinarily abutted against a they will not only be efficient in use but may be shoulder or within a rabbet machined within the more economically manufactured, of less weight, sturdy construction, and unlikely to get out of 30 conventional cast metal housing ring. In the present instance such locating or limiting means repair. may be variously formed within the welded band A further object of the invention is to provide 4. In Figs. 1 and 3 the band 4 is exteriorly in an improved ?eld ring or stator assembly. dented at circumferentially spaced intervals, A further object of the invention is to provide an improved method of ?eld ring assembly and 35 thereby forming interiorly of the ring small pro tuberances 6-45 against which the brush mount an improved method of providing stop abutments ing ring 5 may abut. If so desired, a second within the assembly. similar series of protuberances 6a may be pro A further object of the invention is to provide vided, as limiting stops against which the a motor assembly embodying the advantageous structural features and inherent meritorious '40 laminae 3 may be abutted. Such indentations may be formed in the exterior periphery of the characteristics hereinafter mentioned. With the above primary and other incidental mWba-nd by relatively cheap punching operations, objects in View as will more fully appear in the speci?cation, the invention intended to be pro- I ‘thereby minimizing cost of production. In lieu of indenting the enclosure band 4 at tected by letters patent consists of the features 45 circumferentially spaced intervals, the indenta tion may be continuous as at 1, Fig. 4. Such in of construction, the parts and combinations dentation may be rolled in the band or formed thereof, and the mode of operation, or their equivalents, as hereinafter described or illus-V, 7, by a spinning operation, thereby producing an internal bead or rib Bagainst which the brush trated in the accompanying drawings. In the drawings, wherein is shown the pre 50 mount ring may abut. To preserve a smooth uniform exterior surface and enhance the ap ferred but obviously not necessarily the only forms of embodiment of the invention, Fig. 1 is _, pearance of the band 4, the stop abutments or protuberance may be formed by indenting the a side elevation of an assembled electric motor, interior surface of the band and thereby displac partly broken away, in which the present inven tion is embodied. Fig. 2 is an end elevation 55 ing the material into lugs without disturbing the exterior face of the band. thereof. Fig. 3 is a perspective view of the ?eld ' In Fig. 5 there is shown such alternative punch ring assembly removed from the motor. Fig. 4 ' formed abutment stops wherein the band is sub is a detail sectional view illustrating a modi?ca jected to forming pressure in an axial direction tion of the construction disclosed in Figs. 1 and 3. Figs. 5, 6 and 7 are similar detail sectional 60 by which narrow indentations 9 are formed at 2 2,295,203 circumferentially spaced intervals in the interior subject to breakage, but it also very materially face of the band, and the material removed reduces the costs of production. I therefrom is distorted into a series of spaced lugs From the above description it will be apparent l6 against which the brush ring 5 engages. that there is thus provided a device of the char A very simple adaptation of the invention is acter described possessing the particular features that illustrated in Fig. 6 wherein a supplemental of advantage before enumerated as desirable, but stop ring H is welded interiorly of the band 4. which obviously is susceptible of modi?cation in Such ring may be relatively narrow and serve its form, proportions, detail construction and ar only as an abutment for the brush mount ring 5, rangement of parts without departing from the but is preferably of su?icient width to afford a ll) principle involved or sacri?cing any of its ad stop at one side for the brush mount ring and vantages. at its opposite side for the ?eld laminae. Such While in order to comply with the statute the construction requires no machining operation invention has been described in language more or whatever and the two rings or bands 4—| I, which less speci?c as to structural features, it is to be ?t one inside the other, are easily assembled understood that the invention is not limited to and welded to each other in their adjusted rela the speci?c features shown, but that the means tion by unskilled workmen. and construction herein disclosed comprise the A further adaptation of the the improved con preferred form of several modes of putting the struction, which however involves a machining invention into effect, and the invention is there operation, and hence is less desirable, is that fore claimed in any of its forms or modi?cations illustrated in Fig. '7. In such embodiment one within the legitimate and valid scope of the ap side margin of the band 4 is contracted by spin pended claims. ning as indicated at the left of Fig. '7, and there Having thus described my invention, I claim: after an interior portion of the contracted mar gin is removed to form a rabbet or interior 1. In a dynamo-electric machine assembly, a ?eld ring comprising a group of laminae, a brush shoulder l2 against which the brush ring 5 may mounting ring, a band of sheet metal surrounding abut. The internal diameter of such reduced the ?eld ring and brush mounting ring, a portion and the original internal diameter of the plurality of interior axial indentations in the band are equal, hence the brush mounting ring band and protuberances formed by the indenta and ?eld laminae 3, to be assembled in any of ' tions thereof a?ording stop shoulders for at least the other embodiments of the invention illus one of said rings. trated, may with equal facility be assembled in 2. A dynamo-electric machine casing, includ the form shown in Fig. 7. ing end bells, a ?eld ring comprising a group of In assembling the enclosure band about the laminae, a brush mounting ring and an inter ?eld laminations, the band 4 may be preformed :;_~ mediate section comprising a band of sheet metal and the assembly of laminae, either with or with surrounding the ?eld ring assembly and the brush out the coil winding therein, may be subsequently mounting ring and abutting the end bells, said inserted in the preformed band, or the band may band being indented, and spaced interior stop be rolled about the previously assembled ?eld shoulders formed by such indentation and against structure and welded in situ. Such punching, it) which the ?eld and brush rings respectively abut. rolling or spinning operations as may be neces 3. A ?eld ring mount for a dynamo~electric sary to provide brush ring abutments may be machine, comprising an endless circular band of either previously or subsequently formed. The sheet metal enclosing a ?eld ring and a brush heating of the band incident to welding causes mounting ring, including an inwardly projecting suf?cient expansion that upon subsequent cool offset interiorly of the band intermediate the ?eld ing a shrink ?t upon the laminae is effected. ring and brush ring positions. Otherwise, the band material may be pre-heated 4. A ?eld and brush ring mount for a dynamo to achieve such result. electric machine, comprising a continuous cir If necessary to insure accurate ?t with the rab cular band of sheet metal enclosing a group of beted end bells or heads I, the extreme edges of a: ?eld ring laminations and a brush ring, and an the band 4 may be slightly inturned by spinning, annular ring located interiorly of the band in as at E3, Fig. 4, and a slight machine out made spaced relation with one end thereof and forming interiorly of the inturned edge, to size the band spaced internal stop shoulders therein to main for close ?tting engagement of the heads or end tain the ?eld and brush ring in relatively sepa bells. Ordinarily, however, the band is initially .~. rated relation. constructed su?iciently close to size to make such 5. A ?eld ring mount for a dynamo-electric additional operation unnecessary. machine, comprising a sheet metal tube having In lieu of forming and welding the band 4, a smooth exterior surface enclosing a group of sections of preformed metallic tubing of suitable ?eld ring laminae, and a brush mounting ring, size and weight may be employed, and if pre (VT and an internal integral stop shoulder project heated preparatory to insertion of the ?eld lam ing intermediate the ?eld ring laminations and inae, may be shrunk thereon, or the laminae the brush mount ring. assembly may be pressed thereinto. 6. The herein described method of mounting a To support the assembled motor, a lightweight dynamo-electric ?eld ring and brush ring, in stamped plate or sheet metal saddle l 4, contoured , cluding the steps of inserting a group of ?eld to agree with the curvature of the band 4 and ring laminations in a preheated tube cooling the having opposite uniplanar wings i5 is welded to heated tube thereby shrinking the tube into the band 4 as is shown in Fig. 2. tight-?t engagement with the laminations and The construction described not only greatly deforming the interior surface of the tube thereby reduces the weight of the ?nished motor and 3, providing stop shoulders for the brush ring. provides an unusually strong construction not VICTOR L. DARNELL.