Dec. 10, 1946. 2,412,341 A. KALITINSKY MOUNTING FOR COOLANT TUBES Filed March 27, 1945 ‘ 2 Sheets-Sheet 1 Om g INVENTOR ANDREW KALrrmsKY ATTORNEY Dec.v 10, 1946. 2,412,341 A. KALITINSKY MOUNTING FOR COOLANT TUBES Filed March 27, 1945 2 Sheets-Sheet 2 INVENTOR ANDREW KALrrmKY I ATTORNEY _ ' 2,412,341 omrso smss ’ PATENT omen: Patented Dec. 10, 1946 .1 , ‘ ' 2,412,341 ‘ ~~ ' ,ivloommo FOR 000mm‘ 'ronris v Andrew Kalltlnsky, ,Eaglevllle, Coms, essignor to United Aircraft Corporation, East Hartford, Conn, a corporation of Delaware ‘ Application lust-oil 2t, 1945. Serial No. 585,163 - , e @loims. loll. its-r316) ll This invention relates to e. mounting ior tubes.‘ such as coolant tubes. extending between the stag tiopcry parts of e. ireepiston unit and the reels; roosting piston > In circulating coolorit through the ‘piston es= - . sembly, the connection from the stationary cylinm 2 cylinders, through which air automatically enters st opposite ends of the cylinders. Compressed sirv . leaves the cylinders through discharge valves to, elso at opposite ends oi’ the compressor cylinders and passes into s. center scavenge chamber so and end chambers and > These chemise-arc dots to the piston has been made by telescoping may be connected‘ by c. scavenge manifold, not tubes through whiclicoolsxit might be pumpedv shown. \ into and out of the piston assembly, as shown, for example, in the copendihg Ledwith applica tlon, Seriol No. 585.3%, died March recs; The tight fit of the tubes to minimize leakage has ' ‘Compressed gas from the scavenge chambers enters engine ports and lit which are uhoov= ered by pistons 52 and if} at the end of the power stroke, thereby permitting air to be blown through the engine cylinder. Gas in the engine cylinders . necessitated precise alignment of the stationary is discharged through exhaust ports 58 into eg and reciprocating tubes in order to prevent the tubes from binding during opemtioi'i- of the unit. 15 haust manifold ~~ As shown in Fig. 2, coolant is circulated through The different thermal expansions of vthe several the piston by means of parallel tubes bit odd to, parts of the unit during the operation may, how Fig. 2, the ends oi’ which may-be supported by sta ever, cause enough misalignment to cause bind= tionory ports of the unit, as for example. the ing or excessive wear on the tubes. A’ieeture of this invention is on. orrehgemeht by which the 20 bracket to which may be integral with the end cap 68 and by the brocketflil which may form coolant tubes may have‘ appreciable movement a part of the well 72, Fig. 1, of the central scav in the port or parts in which they are mounted enge member. -. to correct any misalignment. The tubes 82 and 6t fit within tubes 76 and 76 ciehtly ?exible to allow for lateral movement of 25 mounted in the compressor piston. Seals ‘i8 and 80 in the inner and outer heads. 82 and 84 of the the tube, possibilities for leakage of the coolant compressor cylinder prevent leakage of air from especially if the coolant is circulating under Dres the cylinder past the tubes. Tubes ‘it and 16 sure, are greatly increased. One feature of this are long‘ enough, as shown, so that they are al invention is a. connection for the stationary end ways in contact with the seals. \ ' of the tube which will have a. tight connection The tube 64 may have a reduced portion 85 ex with the tube within the range' of lateral move tending from a point adjacent the inner cylinder ment permitted by the mounting of the tube. head 82 to a. point midway of the cylinder so that Other objects and advantages will be apparentv coolant within tube 61 may pass through open from the specification and claims, and from the ings 86 in the tube and thence into the passage accompanying drawings which illustrate an em 88 in the piston. Coolant from passage 88 ?ows bodiment of the invention. . through the. compressor piston and through a. Fig. 1 is a. sectional view through the free-pis In making the coolant tube mounting'su?i ton unit. . I . ~ chamber, not shown, in theengine piston and is . discharged through a. passage 90 also in the com Fig. 2 is a sectional view in another plane show 40 pressor piston. The outlet tube 82 hes a. reduced ing a mounting for the coolant tube. portion 92 which communicates with the passage The unit shown includes an engine cylinder W 90 during the outer half of the piston reciproca having reciprocating pistons l2 and Hi to which tion. Openings t6 provide for a ?ow of coolant compressor pistons l6 and E8 in cylinders 20 and into the tube 82. The above structure is described 22 are integrally connected. Sleeves 24 and 26 attached to the compressor pistons complete the 45 in the‘ Ledwith application, Serial ‘No. 585,160, above referred to, and is not; in itself, a. feature of reciprocating piston assembly. The sleeves in combination with stationary pistons 28 and 30 form air spring cylinders. ‘ . The pistons are moved apart by the burning'of fuel injected into engine cylinder Id through one this invention. ‘ In accordance with this invention, the coolant tube is mounted in such a way that it is free to. move laterally to a limited amount in order to spring cylinders on the power stroke returns the piston assembly. The p’istons are always main compensate for misalignment of the parts and also to accommodate changes in the position of the parts resulting from the thermal expansion tained at equal distances from the center of the during operation. To accomplish this, the tube engine cylinder by a linkage which may include racks extending from the piston assemblies and meshing with a pinion, not shown. Intake manifold 42, which extends ‘around the compressor and engine cylinders, conducts air to intake valves M in the heads of the compressor 60 62 has a ?ange $6 ?tting between a. shoulder 98 on the bracket 66 and a disk I00 clamped between the end of the bracket 66 and a housing I02 mounted on the end of the bracket. Clearance is provided between the disk ion and the tube to > or more nozzles 32. Air compressed ‘in the air permit. the tube to move laterally and the shoul \ t 3' ' - 3,412,341 . I: ._ . 4 ‘ tube to minimize leakage oi the ?uid past said . 'der as terminates at a point spaced‘ irom the tube ' so that a limited amount'oi lateral movement for. cooperating means. ~ 3. In a tree-piston unit, an engine cylinder and the tube may be available. A/ring ilil may ‘be piston, a compressor cylinder and piston, said placed on the‘ ?ange 98 and the shoulder 98 to“ \ 5 pistons being connected to move as a unit, a tube eliminate end play in the tube. To prevent‘ coolant from leaking around the ' mounted on 'and extending from one oi said pis-tons, a stationary tube telescoping with said ?rst tube, the‘ end oi the tube is connected to a pas _. sage ‘I08 in‘the' housing 102 by a ?exible connec- tube, said tubes providing a connection for the circulation oi coolant through the piston, a sup-. tion or sealing device which includes a sleeve ‘ I" having on its inner surface- a resilient seal 10' porting structure ‘for said tube having a coolant passage therein, said structure and stationary tube iorming a cooperating means‘ for supporting the tube in such a manner as to provide a lim-_ action. Adjacent the outer endoi the sleeve I00, ited amount of lateral movement ior the tube. and the housing J02 has a ?exible seal. “2 iormed 15' a ?exible connection between the passage and the > lill which engages with the outer surface oi the - tube and is preferably varranged so that .pres sure acting on the seal will increase the ‘sealing . oi a ring or rubber or a similar material having ‘ end oi the tube. \ i ' . an inwardly extending rib ill extending toward 4. In a tree-piston unit, .an engine'cylinder and piston, a compressor cylinder and piston, the outer end oi the sleeve in such a manner that the pressure of coolant actingon the rib said pistons being connected to 'move as a unit, will increase the sealing engagement ‘with the 20 a tube mounted on and extending from one oi sleeve. .The seal l_l2,may be clamped in place by a ring “6 which surrounds‘ and is radially spaced said pistons.‘ a stationary tube teiesco ing ‘with said ?rst tube, said tube providing a nnection _ for the circulation of coolant through'thc pis from the sleeve. ~ _ ' . ton, a supporting structure ior said tube having The inner end oi tube 12 which has a plug Ill may be supported by a resilient gasket I20 which. 25 a coolant passage therein; said structure and . stationary tube forming a cooperating means for supporting the tube in such a manner as to provide a- limited amount oi lateral movement ' will allow a limited lateral movement tor the tube. The seals 18 and 80, which are~located in‘ the cylinder heads 82 and ll and extend around and engage the tube ‘ll. also have a limited amount oi lateral movement to permit the lat 30 tor the tube, ‘and-a ?exible connectionbetween eral movement oi tube 62 to take place.‘ Thus, the tube 62 will adjust itseli to any misalign the passage and the end' _oi the tube. said con nection including a sleeve, and a seal between the ends oi the sleeve and the tube and passage re ment oi the parts without causing any leakage- - spectively. ,_ ‘ With this arrangement,vthe mounting ior the 5. In a iree-piston unit, an engine cylinder tube may be su?iciently free to permit the desired 35 and piston, a compressor cylinder and‘ piston, said lateral movement oi the tube in compensating pistons being connected to move as a unit, a tube irom misalignment and at the same time they mounted on and extending from one oi said pis tons,la stationary tube telescoping with ‘said ilrst sleeve 1i 8 in conjunction with the seals no and H2 pr ides a substantially liquid-tight connec-' tion between the passage I06 and the tube so that‘ no substantial amount of coolant will be lost past the tube mounting. tube, said tube providing a .connection ior the circulation of coolant through the piston, a sup porting structure tor-said tube having a coolant passagetherein, s'aid structure and stationary . tube iorming a cooperating means ior supporting , ' = It is to be understood that the invention is not 'the tube‘in such'a manner as to provide a lim- } limited to the speci?c embodiment herein illus trated and described, but maybe used in other 45 ited amount oi lateral movement tor the tube, V ‘ ways without departure from its'spirit as de?ned and a ?exible connection between the passage._ by the following claims.‘ ~ and the end of the tube, said connection includ I claim: ' . ing a sleeve, a sealing ring at one end engaging I. In a tree-piston unit, an engine cylinder and' with the tube, and a second sealing ring'engag piston, a compressor cylinder and piston, said 50 ing with the opposite end oi said sleeve.‘ 6. Ina .free-pistcn' unit, an engine cylinder pistons being connected to move as a unit, a tube mounted on and extending irom one oi said ‘pis and piston. a compressor cylinder and piston, tons, a stationary tube telescoping with said ?rst said pistons being connected to move as a unit. tube. said tubes providing a connection for the a tube mounted on and extending from one of circulation of coolant through the piston,‘ and a. 65 said pistons, a stationary tube telescoping with supporting, structure for said tube having a pas said ?rst tube, said tube providing a connection sage‘ therein, said structure and stationary. tube in the circulation of coolant through thepis having cooperating means for supporting the tube ’ in such a manner as to provide a limited amount. of lateral movement for the tube. ‘ 2. In a iree-piston unit, an engine cylinder and ton, a supporting structure iordsaid tube hav 60 ing a coolant passage therein, said structure and stationary tube forming a cooperating means ior supporting the tube in such a manner as to pro piston, a compressor cylinder and piston, said pis vide a limited amount of lateral movement for tons being connected to move as a unit, a tube the' tube. and a ?exible connection between the '_ mounted on and extending from one of said pis pass’age and the endoi the tube. said‘connection tons, a stationary tube telescoping with said ?rst 65 including a sleeve, a sealing ring at one end en tube, said tubes providing a connection for the ‘circulation oicoolant through the piston, and a supporting structure for said tube havinga pas sage therein for coolant, said structure and sta tionary tube having cooperating means for sup 70. porting thetube in such a-inanner as to provide‘ a limited amount oi lateral movement 'ior the tube, and a sealing'device on the end oi the 4 engaging with gaging'with thethe tube, opposite and a second end of sealing said sleeve,‘ ring said sealing rings being ‘constructed and arranged to permit a relative movement between the tubeFand the passage without causing leakage pasttheseals. 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