Патент USA US2406388код для вставки
. Aug. 27, 1946. A. J. LARREcQ 2,406,388. TURBO-sUPERCHARMJRFiled June 10, 1941 2 Sheets-_Sheet 2 ~ Fig. 2. rl4 M. .w w/œVyMA Dt H .n r - a @L „w Tw 1%. , Patented Aug. 27, 1946 2,406,388 "f UNITED STATES PATENT O FFICE « 2,406,388 TURBOSUPERCHARGER Anthony J. Larrecq. Indianapolis, Ind.. assignor to General Electric Company, a corporation of New York Application J une 10, 1941, Serial No. 397,378 4 Claims. (Cl. 184-6) In order to reduce the nozzle box, a jacket is provided which sub ing and supporting pported thereon by connect tion of the wall 24 members 2S. , An inner por forms a plurality of openings 21 for conducting cooling medium to the space formed between the casing 2| and the walls 24, economy are attained. For a consideration of what panying drawings. ‘ The drawing Fig. 1 illustrates' a sectional View of a tur ' Fig. 2 is a section along line 2*2 of Fig. 1; and shown in the draw 20 IIJ, a centrifugal , and a speed-increasing gear- » turbine and for supporting the turbine on the compressor. Turbosuperchargers, especially when used on aircraft, are operated at high 25 speeds of the order o_f 20,000 R. P. M. and above. The jacket wall 24 is provided with a plurality The provision of a speed-increasing gearing for of lugs 3| Vfor s pporting the nozzle box on the `gearing I2. 30 - In'order to cool the downstream side of the> turbine Wheel, a suitable cooling cap may be used, as shown in Fig. 1. The details 'of this cooling ` to an understanding of the dimensions ofthe turbine. My invention par ticularly relates to an improved arrangement for lubrication of such gearing. wheel is secured to a hollow ñanged ' shaft I8 forming a bore I9 by means of a plu rality of bolts 2B. e nozzle box has an essentially ring-shaped for connection 50 i? are secured to and integrally formed with the nut' 69. A set of ñuid . directing vanes 'II is arranged ahead of the auX iliary impeller blades 69 andV supported on and secured to the inlet conduit 65. The inner edges shaped cup 'I2 adjacent th‘e nut 69. Another-*set '2,406,388 4 . includes means for lubri The gearing l2 also bearings and gears and means eating the various to reduce leakage oí lubricant from the casing Sd of circumferentially spaced fluid directing Vanes or nozzle partitions 13 is arranged between theA. `auxiliary blades 63 and thermain blades 5%. along the shafts i8 and €525.y The means to re 'E4 held between two rings 'l5 duce leakage along the shaft S3 comprise laby rinth' type packings H5 and means including said packing to form a leak-off chamber llt `of solid matter into the interior of the corn between the packing lie and the adjacent bear ¿ presser. ing Iûü for receiving lubricant discharged from During operation the set of vanes or partitions the left-hand end of the bearing itil. Another . "H direct ñuid to be compressed towards _the auX-r iliary blades 16. ~ The latter impel such fluid in 10 labyrinth type packing Hl is provided to reduce leakage from the casing ‘Sii along the shaft IE. axial direction towards the vanes 13 which, in The packing îil and the adjacent bearing 88 turn, direct th'e ñuid towards the .inlet portions blades Si. The iluid is im form another leak-oir chamber H8 for receiving ` of the main impeller by lcentrifugal. 1 lubricant discharged from the right-'hand end of pelled by the blades 6i mainly 15 action and forced radially outward into 'the the bearing 99. The space formed by the lowerl portion of the l scroll Sli. casing Se between the bearings til@ and QS forms ' Ardiiïuser 19 is provided for converting part of another chamber i i@ for receiving lubricant from the velocity energy of the medium impelled Vby The dif these bearings and from other elements oi the . the impeller 63 into pressure energy. l fuser 'it is located in a central portion of the 20 gearing. in order to assure thorough lubrication of the Various elements oi the gearing, a pump sci-c1154 and comprises a >plurality-of'varies 3€) `wire mesh screen inlet conduit 65 to reduce access is secured to the t0 rings 2li and 82 i having opposite edges secured l2iì (Fig. 2) is provided fory conducting oil or lise v lubricant to the various elements requiring lubri cant during operation and ythree other pumps rigidly secured to the casing halves 5l and 52 25 iîéi, §22 and £23 are provided íor'removing-lubri» ' ‘ circuinierentially cant from the chambers vl it, lit and iis. The pump E25 has an inlet i242- connectedby spaced bolts B3 and fifi respectively. An outer passages §25, E2@ and i‘ì'i formed in internal and portion of the compressor casingiorms a ñanged centered on the two rcasing halves @l and 62 respectively. The rings »or lwalls 8l. and 82 are opening 85 for dischargingcompressed ymedium external ribs oí the casing 9@ (Fig. 2) to both to a consumer such as an internal combustion 30 leak-oí chambers lie and H3. lIt should» be noted that the passage iìiâ is in front of the ' engine. i2 for driving'the compressor'V f _The gearing f ' ' from the turbine and for supporting the’ latter onA the compressor' comprises-a casing 9e having three outer arms orbrackets 9! with axial bores 92 for receiving the bolts >84. These bolts project throughropenings in the aforementionedpbrack ets 'si oí the nozzle boxfand` are Avrigidly secured to the brackets »el and the brackets 3l ;by means of nuts Q3 thus formin'ga rigid support for the gearingand the nozzle box oni the compressor Y casing. VThe ends ofthe casing 9B, .are closedby end covers'âlá and 9,5 rabbeted to the casing 9G. The turbine shaft i8 and the compressor shait 68 project through openingsY> in the end covers 95 andrSâ respectively, and adjacent end portions of the shafts telescope each other. More spe ciiîcally a> bearing sleeve S5 is- secured in the bore Eil of the turbine shaft I8 and supportsthe right hand end portion of ' the compressor shaft 63. ‘ n The left-hand end of >the hollen/‘turbine shaft i8 issupported on a journal bearing 91 secured plane of the section represented by> Fig. l, whereas the other horizontal passages §33 andY E32 are behind that plane. From a comparison ci Figs. l and 2 it will be understood that the L.id-point or” the horizontal passage §25 is vco-n nected to the pump inlet chamber §24 by the single vertical passage A25. . The pump i2?. has an inlet l2@ connected by passages E353', i3d formed in an internal rib of the casing to the left-hand part (Fig. l) of the main chamber HS. The pump G23 has an inletl I3i connected by passages l32’, §32 to the Fig. l) oi the right-hand part (when viewed in main chamber iis. The provision of two pumps 922 and E23 for. removing oil from opposite ends of the main chamber H9 is desirable in order to assure thorough scavenging of this chamber inthe various positions the gearing may assume' 'when used on an aircraft. The pump E21) for supplying lubricant to the ‘ various bearings and gears has an inlet |33 con nected to a supply conduit i3d for receiving lubri to an inner 'wall' or partition S3 Aof thecasing cant from a source not shown. §43. A portion of the turbine >shai‘t I8 nearthe bearing 99 secured to an inner cylindrical pro has an outlet §35 connected by suitable channels (not shown) to the various elements to be lubri cated. The detail arrangement of these channels cover 95. Similarly, a portion of the compresso-r shaft near ’the impeller is sup-p ' ported on a-journal bearing H35 secured to the is not indicated. in the drawings as it does notY form a part of the present invention. ri‘he lubricant removed from the chambers I i6, bucket wheel i3 is supported by‘anotherjournal Y jection of the end end cover 94. ' The turbine sh'aît .I8 is provided'with a pinion or gear le! located between the bearings 91 and Se .and the compressor shait S8> is provided with ~ a gear H32 arranged between the bearings 91 . and H39. Torque is transmitted from lthe gear i9! on the vturbine shaft to thepgear HB2 on the compressor shaftfby means oran intermediary The pump E29 H8 and HE bythe scavengingrp'umps §25,` §22’` and E23 is discharged from said pumps into 'af drain conduit ist. rthe conduitlßûis connected to a discharge passage lei vcommunicating di rectly with the outlets M2 and m3 of the Ypumps §22 and iìâresp-ectively. The discharge -passage le! is connected by a passage Me formed inthe casing @il to the outlet M5 of the pump ¿l2l`. The four pumps E2C», l2l, i122 and-ltßare of Vshaft l Q3, with two E95 secured thereto and meshing with Ithe gears 70 conventional gear type design andv havedriven"l ì ì axially spaced gears 194 and mi and §52 respectively. f . . ' elements or rotors suitably `connected to a corn- ’ ' The outer ends of the A.intermediary shaft 1&3 are supported by journal bearings m6 and Iû'l, to the inner wall of the gear - respectively,` secured housing., .1» . a ' . . . ` » nien drive shaft M5 which latter has-agearv M114’ meshing with agear ißt secured to; in the present = example integrally formed with. the shaft H13"A ' 2,406,388 and located between the gears |04 and |95 on this shaft. .The gears |41 and |48 are spiral gears with their axis of rotation arranged at right angles to each other. , l Fig. 3 shows the details of the scavenger pump at the extreme right end of the shaft I 46 in Fig. 2. This pump consists of gear, |2I", which may be -pressed or keyed onto an extension |46’ of the shaft |46, meshing with a second gear |24’ sup 6 , casing, means for transmitting torque `between the two shafts, the central portion of the casing forming an oil chamber and end portions of the casing forming leak-off chambers, means for lu bricating the gearing comprising a pump driven from one of the shafts for forcing lubricant into the gearing and separate scavenging pumps con nected to the leak-olf chambers and the inter ported on suitable bearings (not shown) in the mediate chamber for removing lubricant there pump housing. As indicated above, oil from pas 10 from. sage |25 enters the pump inlet chamber |24, is 2. A gearing for aircraft turbosuperchargers comprising a casing with open end' portions, cov- » carried by the gear teeth to the discharge cham ber |45, from whence it goes through passage |44 to the oil-out passage |4|. The gears |2|”, |24’ are separated from the corresponding elements 15 including an intermediate gear shaft supported of oil supply pump |20 by a plate |2|', which is arranged to ñt closely the perimeter of the recess ‘ on the casing for connecting the driving and driven shafts, means including a pump for sup in the pump housing occupied by the pump gear plying lubricant to the elements of the gearing, elements, the plate |2|’ having suitable openings 20 means for removing lubricant from the gearing through which pass the pump _gear shafts. comprising a main chamber formed by a central The above-described oil pump arrangement is portion of the casing, leak-off chambers formed representative of the arrangement of the other gear pumps |29, |22, |23. by the end covers, scavenging pumping means for removing lubricant from both> ends of the main As stated above the end covers 94 andr 95 are chamber and other scavenging pumping means rabbeted to the casing 90. `They are rigidly connected to both leak-on? chambers for remov secured to the casing by a plurality of circum ing lubricant therefrom, and means for driving ferentially spaced studs |49 threaded into the all of the pumping means from one of said shafts. end cover 95 and projecting through bores |59 3. A system of lubrication for a gearing having formed in ribs |5| of the casing V99. The ribs |5| extend from the inner face of the end cover 30 a housing, shaft and gear means enclosed there in, leak-off chambers formed at the ends of the 95 to the adjacent inner face of the end cover 94. housing and a main oil chamber formed by a cen They act to reinforce the casing and what is tral portion of the housing, said system compris more important they reduce leakage of lubricant along the studs through the openings in the end ‘ ing separate scavenging pump means for remov ' ing oil from the leak-olf chambers and the hous cover 94. The end cover 94 is securely fastened to the studs |49 by nuts |52. > ' ing respectively, pumping means for supplying lu The outer lower portion of the gearing’f casing i ' bricant to the gearing, said pumping means hav ing casings formed at least partly by said hous 90 forms a curved channel |55 which may be con nected to a conduit or scoop ing,fand means for driving all of said pumping |56 for receiving air under pressure from the slip means from >one of the shaft means. ’ stream. Such 'air orr 4. A system for lubricating a gearing having cooling medium is conducted through the chan a housing, shaft and gear means enclosed therein nel |55 and discharged into the space | 51 formed and detachable end covers for the housing form between adjacent portions of the gearing casing, the bucket wheel and the nozzle box. Part of 45 ing supports for the shaft means and leak-oil’ chambers for receiving lubricant leaking along the cooling medium is forced from the space |51 , the shaft means, a main chamber for lubricant be through the openings 21 intofthe space formed ing formed by the housing, a pump for supplying between the cooling jacket 24, 25 and 26 and the nozzle box casing 2|'. lubricant to the shaft and gear means, a scaveng What I claim as new and desire to secure by 50 ing pump for removing lubricant from the main chamber, scavenging pump means for removing Letters Patent of the United States: lubricant from the leak-off chambers, and means 1. Gearing comprising a casing, two aligned including a gear shaft adapted ,to be driven from shafts having end portions overhanging from the one of the shaft means for driving all of said casing and other end portions telescoping each pumps. , other and supported on a central portion of the ANTHONY J. LARRECQ.