US1557000A

US1557000A - Dynamo frame

Info

Publication number: US1557000A
Application number: US750645A
Authority: US
Inventors: Ernest R Kuhls
Original assignee: Dayton Engineering Laboratories Co
Current assignee: Dayton Engineering Laboratories Co
Priority date: 1924-11-18
Filing date: 1924-11-18
Publication date: 1925-10-13
Anticipated expiration: 1942-10-13

Description

Oct. 13, 1925.

Y E. R. KUHLs DYNAuo FRAME Filed Nov. 18. 1924 Patented Oct. 13, 1925.

.UNITED STATESV PATENT OF 1,557,090 F l C E.

Elm RUBIS, Ol' DAYTON, OHIO, ASSIGNOB TO THE DAYTON ENGINEERING LABORATORI COHPANY, OF DAYTON, OHIO, A. CORPORATION OF. OHIO.

DYNAMO FRAME.

Application lled November 18, 1984. serial No. 750,645.

' To all whom it may cof/wm.'

Be it known that I, ERNEST R. KUHLs, a citizen of the United btates of America, residing at Dayton, county of Montgomery, and State of Ohio, have invented certain new and useful Improvements in Dynamo Frames, of which the following is a full, clear, and exact description.

This invention relates to construction of frames for dynamo electric machines and includes among its objects a method of manufacture of dynamo frames by which the cost of manufacture may be substantially reduced.

Other and further objects and advantages of the present invention will be apparent from the following description of a preferred form thereof, reference being made to the accompanying drawings.

Fig. 1 of the drawings is a longitudinal sectional view ofia dynamo field frame constructed in accordance with the present invention. Fi s. 2 and 3 are end views looking in the dlrection of the arrows 2 and 3, respectively, in Fi 1. Figs. 4 and 5 are sectional views ta en respectively on the lines 4-4 and 5-5 of Fig. l.

The dynamo frame includes a tubular member 20, whichgprovides the field frame. This frame may be made from sections of iron pipe or may be formed from flat sheet iron into a cylinder havin a welded seam. rIhe frame is provided with one or more openings 21, adjacent one end thereof to provide access to the commutator and brushes which are to be supported within the tubular member 20. Heretofore, it has been the practice to turn or grind the interior wall of such tubular members in order to provide a true cylindrical surface against which the pole pieces are bolted, and which provides for the correct location of the end frames laterally with respect.I to the field frame. The present invention eliminate this expensive machine operation.

Before machining the frame 20 is approximately cylindrical and its end surfaces are onl approximatelyV plane and parallel to eac other. The tubular member 20 is rovided with finished end surfaces 22 an 23 which are parallel to each other and at right 'l angles to the approximate axis of the memnal extending, arallel grooves all at right angles to the p

ane end surfaces

22 and 23. Each groove is defined by a bottom surface 24 and

side surfaces

25 and 26. The distance between these side surfaces is slightly greater than the width of the`shank of the pole piece 27 which the groove is to receive. The bottom surfaces 24 are cylindrical and coincide with a common cylindrical surface, the axis of which coincides with the axis of the cylinder shaft which the frame is intended to support.

The pole pieces 27 are cut from lengths of specially rolled iron having the desired cross section as shown in Fig. 5. The shank of each pole piece 27 has a cylindrical side surface, conforming with and engaging the groove bottom surface 24. But one screw 28 is necessary to secure each pole piece 27 to the tubular frame member 20, since lateral displacement of the pole piece is prevented by the

side surfaces

25 and 26 of the groove which receives Ithe shank of the pole piece. As shown in Fig. 5, pole pieces 27 present pole faces 29 which are equidistant from the common axis of the cylindrical surfaces 24 of the grooves and are therefore equidistant from the axis of the dynamo shaft which is to be supported b the frame.

Against the en surface 22 of member 2O there is secured an end frame 30 which includes a plane annular flange 31 adapted to contact with the end surface 22. The end frame 30 includes a tubular extension 32 for receiving a shaft bearing 33, the axis of which is at right an les to the flange 31. In order to locate the earing 33 centrally of Ithe pole faces 29, the frame 30 is provided with members cooperating with the grooved bottom surfaces 24 for preventin lateral displacement of the frame 30 and or locating the bearing 33 so that its axis will be located parallel to and centrall of the pole faces 29,. These locating mem ers are provided by the radially extending projections 34 of a disc 35. The edges of these projections 34 are arcuate and are equidistant from a central sleeve portion 36 of the disc 35 which is adapted to receive the shaft bearing 33. The disc 35 is secured to the end frame 30 by rivets 37, which also secure brush brackets 38 and bracket insulation 39 to the end frame 30. The distance between the diametrically opposite edges of the pro-- jections 34 is substantially equal to the dis tance between diametrically opposite rtions of the groove bottom surfaces 24. t is therefore apparent that when the frame 30 is secured a ainst the end surface 22 of the member` 20 the shaft bearing 33 will be located tlarallel to and centrally of the faces 29 of e pole ieces 27.

Against t e end surface 23 of the tubular frame member 20 there is secured an end frame 40 having a plane annular rfportion 41 ada ted to -engage the end su ace 23. Centra ly thereof the frame 40 supports a sleeve 42 provided with a shaft bearing 43, the axis of which is pe dicular to the portion 41. In order to ocate the bearing 43 centrally with respect to the le faces 29, the frame member 40 is provided with lugs 44 which are cut from and bent away from the main portion of the frame 40. Each lug terminates in an arcuate edge 45 and all the edges 45 are equidistant from the axis of the shaft bearing 43. The vdia metrical -distance between oposite edges 45 is substantially equal to the 'ametrical distance between opposite groove bottom surfaces 24. Therefore, when the frame 40 is secured against the end surface 23 of the tubular member 20 the axis of the shaft bearin 43 will be located parallel to and centra y of the ole faces 29, and also in alignment with t e axis of the shaft bearin 33.

e frames

30 and 40 are s'ecured in position by bolts and nuts 51.

From the foregoing description it is agarent that the cost of manufacture of t e dynamo has been materially reduced by rea son of the simplicit of construction and by a method of manu acture which eliminates many of the expensive machine operations which heretofore have been performed. As alread mentioned, it has been the practice to ma e the entire interior surfaces of the tubular frame member perfectl lindrical in order to provide surfaces or ocating the end frames and pole pieces. The method disclosed herein provides for machining the interior surfaces of the frame member at only a suicient number of places to locate the end frames and pole ieces. the remaining portions of the interior of the tubular frame member being unfinished.

Pole pieces formed from sections of specially rolled iron bars have been found satisfactory since these bars can be rolled fairly uniform with respect to cross sectional d1- mensions. The cylindrical surfaces of these bars are sufficiently exact so that no machine operation is required. The pole pieces are merely cut off from lengths of bar stock and are drilled and tapped to receive the securing screws 28.

The

end frames

30 and 40 of the disc are constructed preferably of flat sheet material and can be struck up by suitable punches and dies inte the desired shape very ra idly. These frames are provided with radi y extended and strengthening ribs as indicated in Figs. 1 and 2. The

bearings

33 and 43 are press fitted within the

tubular portions

32 and 36, and the tubular portion 42 respectively.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be ado ted, all com` within the scope of the c aims which fo ow.

What I claim is as follows:

1. A dynamo frame comprising in combikvnation a tubular member having parallel end surfaces and interior] thereof, a luralit' of spaced, longitu all exten 'ng para el locating surfaces at ri t angles to the end surfaces; a lurality of pole pieces secured to the tubu r member, the shank of each pole piece engaging a locating surface, the pole ieces having their faces equidistant from t e axis of the shaft to be su ported by the frame; and end frames eac secured a ainst an end surface of the tubular mem r and having spaced locating members each terminat .in a surface adapted to engige one of e locati surfaces of the tu u ar member, and eac having a shaft bearin so related to the locating members that t e shaft bea will be in alignment and located cent y of the faces of the pole pieces when the end frames are assembled upon the tubular member.

2. A dynamo frame comprising, in combination a tubular member having parallel end surfaces and, interiorly thereof, a luralit of spaced, longitudinally exten para lel grooves at right angles to the en surfaces having bottom surfaces equidistant from the axis ofthe shaft which the frame is intended to support; a plurality of identical pole pieces each having a shank bottoming in a groove; and end frames each secured against an end surface of the tubular member andhavi a shaft bearing at right angles tothe en surface and having spaced locating members terminating in surfaces aecluidistant from the shaft bearing and each a ted to bottom in one of the grooves of the tu ular member.

3. A dynamo frame comprising, in combination a tubular member having parallel end -su aces and interiorlv thereof, a luralit of spaced, longitudinally exten ing para lel ves at ri t angles to the en surfaces aving cylin rical bottom surfaces equidistant from the axis of the shaft which the frame is intended to support; a plurality of identical pole pieces having a shank provided with a correspondingly cylindrical surface adapted to bottom in a groove; and end frames each secured against an end surface of the tubular member and having a shaft hearing at right angles t0 the end surface and having spaced locating members terminating in cylindrical surfaces equidistant from the shaft bearing at a llistance substantially equal to the radius of curvature of the grooves.

4. A dynamo l'raine comprising, in combination, a tubular melnher having an approximately cylindrical interior Surface provided with parallel grooves having cylindrical bottoni surfaces of the saine radius of curvature and eqnidistant l'roni the axis of the shaft which the frame is intended to support; and eiul frames eaeh having a shaft hearing :unl cxleiuliug radially therel'roni a plurality of locating nielnbers terminating in locating laurl'accs having a coininon radius ot' curvature. centering in the axia` ol the lahal'lI hearing aiul substantially thc sanne radius as the curvature. ol the botlonis ol' the grooves.

ln tesliinony whcreoll l hereto allix iny signature.

ERNEST R. KUHLS.