US1626760A - Engine bedplate - Google Patents

Description

May 31, 1927.

" 526611 j f f R. SCHNEIDER ENGINE 'BED PLATE Filed April 19. 1921- Patented May 3, 1927. Y

nutren stares l tegame Parsnror RUDOLPH SCHNEIDER, OF ST. LOUIS, MISSOURI, ASSIGNORUTO 'BUSCH-SULZER BROS.- DIESEL ENGINE C0.,OF ST: LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

. ENGINE-BEDPLATE.

Application filed. April 19, v1921. Serial No. 462,754.

The object of this invention isa bed plate for large combustion engines, having facilities for attachment either to amasonry foundation or a structural steel foundation so as to lenable a single base castingto be used for either purpose. It has heretofore been customary for manufacturers of large engines to employ different designs of bed plate structure for the twol situations, the engineering considerations in the t\vo cases being quite different. The double function bed plate construction of this invention obviates the need of such special designing and Works corresponding .and obvious `economies in the cost of production. 1

The accompanying drawings illustrate a double function bed. plate according to my invention: F ig. lisa vertical section showing the bed plate anchored to a concrete or masonry foundation, a part of a verticali engine being also shown. Fig. 2 'is a. similar section showing the plate mounted onstructural steel bearings, and Fig. 3'- a plan of one end ofthe bed plate in its rudimentary form, that is to say before any bolt holes for the holding down bolts are drilled, al part of its top' flange being broken away tonshoiv the lower flange. K f y The bed plate shown consists of a massive rcasting having girder type side' and cross members, of which the side Wall portions are constituted of relatively deep and substantially vertical web plates 1 and vtop and bottom horizontal flanges marked 2 and 3,!and 4 and 5 respectively, giving such side portions a conventional I-bea-m or girder cross section. The cross-plate members 8, of which there may be any suitable number, are also similarly shaped having top flanges and also bottom flanges Which, however, are merged into and formed as a part of the `floor or bottom Wall 12 of the structure.

Suchbottom Wall is depressed at the centerv to accommodate the engine cranks and serves as a receptacle for oil as customary. Each cross member is formed with a suitable recess in its upper margin to serve as a pillow block for the crank shaft bearing as indicated at 9 and all of the flanges are braced by angle ribs or cross-Webs such as and 1l where the mechanical stresses require. The

upper surface of the bed plate structure is nachined to receive and carry the engine superstructure as indicated m Fig. 1 and this superstructure is bolted to the top glrder flanges 3 and 10 bolts shown at 18. This` connection obviously constitutes the bed plate asian organized part of the engine frame structure contributing thereto the strength and stiffness of thev girder design.

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The longitudinal orl side girder portionsk l,

are formed at'intervals along their length, and preferably at points coinciding with the -junction ofthe cross-girder members 8 `with deep bolt sockets 7 f adapted to receive thev large holding-down bolts17 such as are commonly used for bolting engines to masonry foundations. anchored in thel masonry 14 beforel the engine' is installed. The bolt sockets 7 are Such bolts are embedded or y formed in and constitute a part of the vertical web 1 of the side girder construction, and their depth or length coincides with the vertical dimension thereofsothat the holding-down nuts' 16,1nay thus find a bearing on the top cord of the girder construction .of the bed plate. The bolt socket is formed as a. coredl aperture infa tubular column of metal immediatelyA adjacent to and surrounding thebolt, andy as cast the aperture is preferably coveredoverby a thin layer of metal as shown at 19 in Fig. 3 andwhich-is drilled out to admit the bolts 17. For installing the engine on a ship or other vstructural steel foundation such as indicated bythe members 15, sufficient of the projecting bottom lia-nages above referred to as constituting part .of the side gird-er construction (the flanges l in the drawing), and which either rest directly on the structural foundation-15 or are providedl with a row of closely spaced bolt holes 18, very much smaller in diameter than the bolt sockets 7, to receive the correspondingly smaller attachment bolts as indicated in Figs. 2 and 3. The relatively large number of boltsused for this style of installation serves not only to bind the bed plate securely to the foundation, but also, specially, to resist the tendency for the engine to slip on the foundation under the conditions of marine and similar uses. In this respect the small bolts 18 have the function of dowels, and therefore they fit their holes snugly and it is desirable that they be received in the bottom of the bed plate structure. In the case .of the larger bolts these considerations do not apply to the same extent and the bolt sockets can be made and are made by corings of considerably larger 9o y throughthe interposed shim-s or chocks 1&1-, i'

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ydiameter than the holding-down bolts they accommodate. As a matter of economy of labor as well as for appearances the bolt holes 18 are not drilled through the flange in the case of bed plates which are to go on masonry foundations. Neither are the coverings of the sockets 7 drilled out when the bed plate is to go on ship board. Both sets of bolt-receiving means are nevertheless potentially present in the rudimentary bed plate as cast (Fig. 3) in the sense that requisite provisions therefor are initially incorporated in the casting and can be completed or finished with no diliicultyas needed and even on the job if desired.

The distinguishing characteristic of my bed plate structure, it will now be observed, is that it is arranged to 'receive numerous small holding-down bolts in accessible positions adjacent its bottom where they may act effectively as dowels, and at the same time it is arranged to receive a less number of relatively large holding-down bolts in accessible positions on its top cord, the structure being further arranged to e'liiciently sustain the stresses of both types of bolts so that either may be used. To this end outwardly projecting flanges like those at 4L conveniently provide for the reception of the smaller bolts, Vand tubular socket columns 7 extending between the upper and lower flanges,

eliminate the danger of distorting the casting` by over tightening the nuts on the large bolts as well as strengthen the structure at these points where the holding-down stresses are especially severe when the large holding-down bolts are used. The cored columnsl 7 conveniently provide cross-webs immediately at the sides of the-large bolts as well as webs outside these bolts but other appropriate arrangements of metal or angle braces may be substituted and however constituted, if located entirely at one side of the vertical web l, are desirably accompanied by cross-Webs or angle braces immediately opposite on the other side of the vertical web ,and these are preferably provided, as shown,

bythe cross-girder members 8 which are particularly adapted for the function. Obviously therefor, the structure herein before illustrated and described is subject to modification within the terms of the appendedclaim. I have not attempted to describe various features and devices commonly found in bed plates but not directly related to the invention, such for example, as

' a. step bearing for the lay shaft that connects that while I have referred to the whole bed plate of an engine as consisting of a single integral structure the same may, in accordance with common practice for high power engines, be made of assembled parts constituting what I have referred to above as a complete bed plate. Y

Claim.

A double function bed plate for vertical internal combustion engines comprising longitudinal and transverse cross-girder memfil) bers and bolt sockets, closed at their tops,

connecting upper and lower flanges of each longitudinal girder member, whereby Ithe bed plate may be adapted to structural steel foundationsv by forming holes in the lower flanges of the longitudinal girder members or may be adapted to masonry foundations by opening the closed tops of said bolt sockets.

vIn testimony whereof, I have signed this specification.

RUDOLPH SCHNEIDER.

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