March 18, 1941. H. LENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 ll. Sheets-Sheet l t frventor: A. 2 2Y S. H. E.Z. (2-4-1675.- o-ee-ea, March 8, 1941. H. N.T. 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 ... Sheets-Sheet 2 2 ea (A4 r W V4E)SSS Asses eséS4a /7ventor Azaga Aeraíze March 8, 94. H. ENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOOTIVE STEA, ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS - Filed June 23, 1937 ll. Sheets-Sheet 5 of it -- f co 7ine /7 secona's 70%too 7% Alig.8 //7 vertory Afaga Aerzáz Viarch 18, 1941. H. ENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 Sheets-Sheet 4 March 18, 1941. H. LENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, l937 ll. Sheets-Sheet 5 ASA'sO2S2 It Esis H.SEP5Eir HoH gear P O Ye-1O Hugo /nventor:Lone ar 2-2. March 18, 1941. H. LENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, l937 ll. Sheets-Sheet 6 SRES SSSSSSSSS&r eners T is . N WS 7tly, SkyN R.S.S.L.N At SSSE sRSX-RanSrsSense re fé th ZZZ 75 79- as ZZ2 2S322A & ;: is 2%$253. SNZZY2&S3. z 27x3x2)SN2 7) 74 17 | if sS---, //7ve/7tor. Afzago Leafz E37 6-127. Af7 offive-f. March 18, 1941. H. LENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 ll. Sheets-Sheet N 24 M NNNNI5,24% NX, 2rrrr.SNS o theV NeNRNasr T - - - Net N y NNNAFN 9NN /nventor - Azgo Leafz 31 March 18, 1941. H. ENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LocOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 ll. Sheets-Sheet 8 29 R N S.SW SNSS |E Zº 99 £<<<<<<<*S.| 89 (SSSSSSNŠ. º.zzzzzzzzzzzzzN`?TT? LIFNONNNNNNNNNNNN!! !Nr S RSSYN,SNSN? SSÉS,SNS:ss (~~~> 99 hì ¿ZZZZZZZZZZZZZZZ) NNNNNNNNNNNNÝ /rventon Azego Leazz r (2 afroana/ March 18, 1941. H. LENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 ll. Sheets-Sheet 9 FlFig.20O 5 SES 39 2 O S2% 2 A S n S. ga SSSSSSS22 N C 244YYZ2444447 A412.É. ZZZ ZZZZZZZZTP /7 werfor faega Zerafz ” (2. ess/ Af77Offa 1?. March 18, 1941. H. LENTZ 2,235,223 WALWE DISTRIBUTION FOR PISTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM ENGINES AND THE LIKE WITH REVOLVING REVERSING SHAFTS Filed June 23, 1937 ll. Sheets-Sheet 10 IF - | ss //7ventor E fizuga lenáz 13-2,A77OAweap March 18, 1941. H. LENTZ 2,235,223 6. SS 2.ZZZZ.4 22Z77Ef ra S. Anventor Afzugo Aeradz isy Patented Mar. 18, 1941 2,235,223 UNITED STATES PATENT OFFICE 2,235,223 WALWE DISTRIBUTION FOR PSTON STEAM ENGINES, ESPECIALLY LOCOMOTIVE STEAM. ENGINES AND THE LIKE WITH REvoLVING REVERSING SHAFTs Hugo Lentz, Berlin, Germany Application June 23, 1937, Serial No. 150,000 In Germany June 26, 1936 5 Claims. (CI. 121-167) This invention relates to a poppet Valve gear On level stretches and for the cruising Speeds in for piston steam engines especially for locomo the case of ships. For this part the charge is so tives and marine engines, in which the admis chosen that during this by far the longest work Sion and exhaust valves are actuated by rotat ing period the most favourable engine output is able axially shiftable control cams. obtained, that is during this entire working pe. In the known poppet valve gears of this type riod the control parts run on and off with full the lifting surfaces of the admission cams rise line contact. m to the same height throughout along their en The Second part of the control cam which is tire axial length. With generating lines parallel intended for the other charges, is only used when O to the axis of rotation in order to then descend starting up, maneuvering and on up gradients..." in a helical line for setting the different charges. Consequently it is only stressed occasionally and By the axial displacement of the cams the charge for short periods, but also in this case the con and consequently the output of the engine can be trol element runs. On with full line contact until changed. This construction of the cams is, how the Valve is completely open and retains line con 5 ever, open to the objection that they and the tact up to the running off. elements actuated thereby are subjected to heavy The invention also relates to another construc wear because the control cams have only point *tion of Such a can controlled Valve gear. contact with the elements they drive. This ob The construction of the new rotating control jection can only be overcome to a certain extent cams is illustrated in FigS. 1 to 9, whereas the 20 by gentle ascending lifting surfaces, apart from Figs. 10 to 25 illustrate the application of this 20 the fact that it results in Sluggish that is too kind of distribution on locomotives with different Slow opening of the Valves. valve arrangement and different constructions of It has already been proposed to construct the the reversal. rotary driving cams of poppet valve gears in Fig. 1 shows the admission control cam in side 2 5 step shape, by providing several lifting surfaces elevation. 25 With generating lines parallel to the axis of ro Fig. 2 shows the admission cams for forward tation and on which lifting rollers run, these movement and back Ward movement (the latter lifting surfaces being connected by approximate only partly) in top plan VieW; . ly cone shaped inclined surfaces. The individual Fig. 3 shows a development of the admission 30 lifting surfaces and the rollers running thereon cam into a plane, the cross-section of the inter- 30 can, however, only be of Very narrow width. mediate lever cooperating with the control can Apart from this the total length of the control being indicated. cams will be very great and consequently con Fig. 4 is a section on line IV-IV of Fig. 2 siderable displacements of the cams are necessary with the intermediate levers acting upon the ends 35 especially when reversing the engine. As re of the valve spindles omitted in Fig. 2. -35 gards wear only slight advantages are derived Fig. 4a, is a similar view as Fig. 4 with rollers. and moreover on a small number of different Figs. 5 and 5a show the intermediate lever charges can be adjusted. Furthermore no con in section on line W-W of FigS. 4 and 4a. tinuous changing of the charges is possible and Fig. 6 shows the curve of the valve lifting, 40 when changing over fron One charge to another Fig. 7 the curve of the speed and 40 the element driven by the control can must be Fig. 8 the curve of the acceleration or re lifted off. - - - tardation of the Wave. The present invention relates to a poppet valve Fig. 9 shows the exhaust control cam in Side gear with rotary control cams by which not only elevation. 45 the abovementioned objection of the known gears Fig. 10 shows the exhaust can for forward 45 are avoided but an extensive adaptation of the running and backward running (the latter only cams to the normal or continuous service of the partly). in top plan view, . engine is attained. The invention is based on Eig. 11 shows the drive of the revolving cam the knowledge that piston steam engines which shaft of a locomotive in side elevation, the cam 50 serve for driving locomotives, ships or the like shaft extending transversely to the frame. 50 operate during the greater part of their service Fig. 12 is a top plan view of Fig. 11 with a with a certain minimum or normal charge, section through one of the valve chests of one Whereas larger charges are only Set by Way of cylinder-half. exception for example when starting up, ma Fig. 13 is an end view of the locomotive with 55 neuvering and so forth. a part Section in direction of the cam shaft. 55 Consequently the admission Valve according to Fig. 14 shows a section through the worm wheel the invention has two different parts. One part, r drive on line XIV:XIV of Fig. 11 on larger Scale. whose lifting and lowering Surfaces have gen Fig. 15 is a section through one of the control erating lines extending parallel to the axis of valves and the cam shaft chamber on line 60 rotation, is intended for driving the locomotive XV-XV of Fig. 12 on larger scale. 80 2 2,285,228 Fig. 16 is a longitudinal Section in the direction the intermediate lever at straight running on of of the can shaft on line XVI-XVI of Fig.12 the scam. The acceleration has thus been in On larger Scale With an arrangement for ad creased to an admissible maximum value and its justing the camshaft by hydraulic pressure.