US1742256A - Bearing for turbine shafts - Google Patents

Description

Jan. 7, 1930. s. A. .JzssoP 1,742,256

BEARING FOR TURBIBE SHAFTS Filed Sept. 18. 1924 2 Shuts-Sheet 1 can,

I v v snu Z Jan. 7, 1930. s.- A. JESSOP 1,742,256

BEARING FOR TUR BINE SHAFTS 1 Filed Se t/1a, 1924 2 Sheets-Sheet 2 Patented Jan. 7, 1930 I UNITED STATES PATENTVOFFICEV GEORGE A. J sSo OF Yo x, PENNSYLVANIA, ASsIoNoR To S. MORGAN SMITH. 00.,

oE-YoRx, PENNSYLVANIA, A CORPORATION E PEN SYLVANIA BEARING PoR TURBINE S ETS Application filed September 18, 1924.- Serial Nd. 738,505.

I for the strips,'withthe sides of the grooves or spaces radially disposed, that is, pointing towards the center of the bearing. The lignumvitae stripswere then planed and fitted.

in these grooves or spaces. It is impossible to cast these grooves or spaces of exactly the same dimensions, or, so that each groove or space will be of the same width and general shape throughout its length, and consequently a great deal of work was necessary to properly fit the l-ignumvitae' strips in the grooves or spaces formed by casting. Plan- 7, ing the grooves or spaces has also been practiced to eflect a proper fitting of the strips in the grooves or spaces.

All of the usual methods heretofore pursued to reliably and effectively associate the lignumvitae strips with the cast grooves or spaces of a container or carrying means therefor have proved to be very laborious and'ex pensive. It is necessary-to very tightly fit these strips in the container or carrying means, in view of the factthat after such placement, the container with the strips therein is placed in a lathe or boring machine and the inner portions or edges of the strips dressed or b )red to the exact diameter desired. 1

One object of the present invention, therefore, is to eliminate as'rmuch as possible, the work requil ed to fit lignumvitae strips in a cast contain er or carrying means formed with grooves or spaces to receive the strips andto holdthe latter in place with greater security than'by the methods heretofore practiced.

A further object of thein'vention is tore-[.1 duce the numberof strip-receiving.grooves or spaces usually required in a containeror; carrying means about one-half and thereby. correspondingly reduce the cost of handling and molding the containers or carrying means inafoundry. w

A still-further object of the invention is they to advantageously construct containers or carrying means for lignumvitae stripsby increasing the dimensions of the grooves or spaces therefor and providing for a more rigid anchorage and retention of the said containers or carrying m'eansin the molds,

of losing the with materially less liability casting due to breaking or washing.

WVith 'these and other vobfects and adt I the novel construction and arrangement of I J vantages in View, the invention consists in the several parts which will be more full hereinafter described and claimed. I

In the drawings: I Fig. 1 is a transverse vertical section bearing embodying the features of the invention.

Fig. 2 is an enlarged horizontal section of a portion of the'containeror carrying meansv and lignumvitae strips disposed arounda portion of a turbine shaft and taken. in the plane of the line 22, Fig. 1.

Fig. 3 is a view similar to Fig. 2, showing a modified construction. 7 Fig.4 is a. view similar to Fig. 3, showing a further modified construction.

The improved bearing is shown applied to a turbine shaft5 in association with which is shown acontainer or carrying means 6 sur-v rounding the shaft and metered as usual in and secured to a turbine frame structure, .a part 7 of which is shown as having an upper well known formof bearing component- 8. The features of the invention are not limited to application .to any precise hearing as it is intended .that the same be applied to any shaft and cooperating mechanism with which maybe practically and efliciently operable. The illustration of the turbine shaft 5 in the drawings is, therefore, to be understood as but one of the many applications that may be made of the improved bearing.

The container or carrying means 6 is preferably formed of suitable metal in sections, as shown by Figs. 2, 3 and 4, and suitably secured, and referring to the preferred form of bearing shown by Fig. 2, the inner side or or carrying diameter the'container or carrying means in the present instance as compared to similar devices heretofore constructed is formed with about one-half of the number of grooves on s aces '9, and as a consequence in the construction of the grooves onl half the number'of cores are required, an cost of production is-therefore materially reduced or minimized. Moreover, cores of la er dimensions are utilized and can be more rigidly secured-and held in place in the mold. In the preferred structure as shown by Fig.

1 2 the lignumvitaastrips 10 are cut and planed ly in place.

to an exact predetermined size and two of the strips are placed in each groove or space 9. A mortise strip 11 is then' fitted between each two lignumvitae strips and driven tight- These mortise strips 11 are of less inward extent than the lignumvitae strips 10 and have their inner edges terminating preferably in'line with the inner wall of the container or carrying means 6. v The mortise stri s are also made of much softer wood the lignumvitae and can therefore be more easily worked, with material saving in time, and particularly in view of the fact that onl one mortise strip is interposed between eac two strips of hgnumvitaa. In view of the fact that lignumvitaa wood is very hard and tough and re uires considerably more time and effort to p ane, fit and drive than the softer wood used for the mortise strips, the asso-'.

fact, imposes a more severe test on the secure- Y ment of the lignumvitac strips than the actual operation or association thereof with or around a shaft or when applied.

p In the form of the improved bearing shown by Fig. 3 the same general construction of the grooves or spaces to receive the lignumvitae is embodied and corresponding reference characters ap lied thereto as in the preferred form of the earing shown by Fig. 2, but

in this modified form the inner opposing sides 12 of the lignumvitaa strips 10 have outwardly converging portions or inclinations, as at 13, and therein are fitted mortise strips 14 having opposite inclined side edges 15, and

at regular intervals these strips are bored or formedwith openings 16, to receive fastening screws 17 having their heads 18 countersunk in the inner side portions-of the mortise strips and their screw-threaded shanks engaging the time, labor and serve as incidental fastenin means Forms shown by screw-threaded openings 19 radially formed -in the container or carrying means 6 in central relation to the grooves or spaces 9. The mortise strips 14 in this modified structure may be formed of steel, wood or other material adapted for the purpose.

In the further modified construction shown by Fig. 4 the container or carrying means 6 has a plurality of grooves 20 formed the full length of the inner side thereof, to receive lignumvitae strips 21 having. their sides formed with angular recesses 22 between the inner and outer ed es thereof, to receive mortise strips 23, whic have their opposite side edges constructed with projections 24, corresponding in contour to t 1e recesses'22. The mortise strips 23. as shown by Fig. 4 are driven down between the lignumvitae strips 21 and tightly secure the said strips 21, in View of t e engagement of the recesses 22 by the side projections 24 of the said mortise stri s.

F i'om the foregoing it will be seen that' each of the forms of the improved bearing comprises a mortise strip interposed between the lignumvitae stri s, and in the forms of the bearing shown by igs. 2 and 3, the grooves or spaces 9 for the lignumvitae strips are wide enough to admit two of the said strips and the interposed mortise strip. The fastening devices, or the screws 17 shown by Fig. 3, for the mortise strips, and in the Figs. 2 and 4, the mortise strips are used alone without fastening means other than frictional and recess and projection engagement of the associated parts, or the lignumvitae and mortise strips.

The essential features contemplated by the invention are, the reduction of work necessary to devise a container or carrying means for the bearing strips by minimizing the number of grooves usually employed and re quired to hold the water lubricated bearing strips in place and the element of expensive loss frequently incident to the production of these containers or carrying means, and the yielding strips between the hard strips which directly engage the shaft to compensate for irregularity of the spaces or grooves for receiving said hardstrips and insure a frictional binding between the adjacent portions of the hard and yielding strips of such positive character as to reliably hold the hard strips in place during dressing operations of the inner edges of the said latter strips to render these edges true and of the roper dimensions relatively to the shaftjwith which the hard bearing strips have en agement, and further, to also hold these hard strips against any tendency to looseness or displacement when in engagement with the shaft. .The reduction of the number of grooves in the container or carrying means and the use of yielding strips in association with the hard bearing strips minimizes the cost of preparing the grooves in the container or carrying means by materially eliminating machine dressing operations relatively to the Walls of the grooves. The hard and yielding strips are of uniform lengths, both sets of strips being approximately of the same length as the grooves of the container or carrying means so that an equal bearing contact or engagement of the hard strips may be had with relation to the shaft continually throughout the length of the container or carrying means.

It is proposed to use the .improved means for holding lignumvitae strips as hereinbefore described in connection with well known adjustable bearings, the adjustability of the bearings of this character not in the least affecting the features of the present invention which relate to the securement of the lignumvitae strips in a fixed and reliable manner in the container or carrying means, and moreover, the latter means may be modified in its general construction for adaptation or application to various forms of bearing organizations and mechanisms. It is obvious that changes in the proportions, dimensions and minor details of construction may be adopted without departing from the spirit of the invention.

What is claimed as new is:

1. In a bearing of the class specified, the combination of a container having relatively wide grooves formed in the inner side thereof, a pair of hard wood bearing strips mounted in each groove and extending inwardly beyond the inner terminals of the grooves, and securing strips of softer wood material interposed between each two of the bearing strips, the bearing strips being wedged at their sides opposite those engaged by the securing strips against the walls of the grooves of the container, the bearing strips and securing strips continuing lengthwise throughout the interior of the container.

2. In a bearing of the class specified, the combination of a container havingrelatively Wide grooves, a number of bearing strlps of hard wood material removably mounted in each of the grooves, and securing strips of a different and softer wood material individually and removably mounted between and engaging the adjacent sides of pairs of the bearing strips and frictionally engaging the latter, the bearing and securing strips being lengthwise continuous over the interior of the container.

3. In a bearing of the class specified, the combination of a container having relatively wide grooves formed in the inner side thereof, bearing strips of hard wood removably mounted in each of the grooves, and securing strips of softer material individually interposed between and engaging the adjacent side edges of pairs of the bearing strips and of compressible wood texture to positively fix the bearin strips in the grooves. 4. In a earing of the class specified, the combination of a container having relatively wide grooves formed in the inner side thereof, a plurality of bearing strips mounted in each groove and constructed of hard wood material of a water lubricating character, and securing strips of softer wood material individually interposed between and engaging the side edges of each two of the bearing strips of less inward extent than said bearing strips, the bearing and securing strips continuing lengthwise over the interior of the container in substantially parallel relation.

In testimony whereof I have hereunto set my hand.

GEORGE A. JESSOP.

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