Oct. 12, 1948. R. DAUE3 2,451 ,322 INTERNAL-COMBUSTION ENGINE Filed Dec. 22, 1944 2 Sheets-Sheet l | I ----???ZZZZZZZZZZZZZZZZZZ22??? area ? ?? ??? ?? Oct. 12, 1948. R. DAUB 2,451,322 INTERNAL-COMBUSTION ENGINE Filed Dec. 22, 1944 2 Sheets-Sheet 2 LYJiiiYLiiiiYiiiLLLJYi S" il Sz53 % Z ????????> INVENTOR. (u Patented Oct. 12, 1948 2,451,322 UNITED STATES PATENT OFFICE Rudolph Daub, West Caldwell, N.J. Application December 22, 1944, Serial No. 569,3i 5. Clains. (C. 123-73) 2 This invention relates to 2-cycle internal con counterweight 23 are placed in a metal die having bustion engines and particularly to such engines a cavity in the shape of front crankcheek 24. The in which the pistons are paired, each pair being metal poured into this cavity will combine these connected to a single crankpin. Separate pieces into a tightly gripped one piece The main object of the invention is an engine assembly. To absolutely insure this grip slot 25 of this type containing features and character and hole 2 are provided in the cheek, the latter isiics conducive to more economical manufactur one to receive a clamp bolt 27. Positive axial ing innethods. location is maintained by notches in crankpin Another object is an engine, the structure of i8 and Shaft 22, both notches partially embrac which permits the extensive use of light alloy 10 ing clanp bolt 2. die castings. Counterweight 23 is a steel or brass stamping Another object is an improved cylinder, gas and is provided with holes 29, the holes, being tank, needle valve and ignition timer arrange filled by the metal during the casting process, ment especially adaptable to miniature model forming the means for retaining the counter engines such as used in toy airplanes, boats and 5 Weight. Within its confines of the crankcheek 24. i’a Cing Call’S. By the aforesaid means and method a very Other objects will be apparent in the following SGuind crankshaft can be fabricated very eco Specifications and dra Wings ShOWing a preferred nomically, requiring a minimum amount of form of the invention in Which machining, because for both crankpin and shaft Fig. 1 is a longitudinal section through the en 20 commercial drill rod stock, which is made to very gine assembly taken at the line - of Fig. 2; CiOSe tolerances and marketed at a low price, can Fig. 2 is a cross section through the engine be employed, limiting the machining operations taken at the line 2-2 of Fig. 1; for the entire shaft to cutting threads 28 only, Fig. 3 is a top view of the cylinder head; said thread to receive a nut retaining the pro Fig. 4 is a fragmentary section showing the gas 25 peller, flywheel or the like. transfer channel connecting the crankcase with The housing 0 has a fiat face i 29 coinciding the cylinder intake ports and taken on line 4-4 with line 8-3 on Fig. 1, the face being of a shape of Fig. 2; as seen in Fig. 8. Terminating at said face 29 Fig. 5 is a Section through the crankcase intake are crankcase intake port belt 30, cylinder intake port belt taken on line 5-5 of Fig. 2; 30 port belt 3 and cylinder exhaust port belt 32. Fig. 6 is a section through the cylinder intake In communication with these port belts are the and cylinder exhaust port belts taken on line holes 33 of the cylinder sleeves 34, said cylinder 6-5 of Fig. 2; sleeves being inserted into bores ofcrankcase and Fig. 7 is a front view of a gasket structure; and cylinder housing 0. The upper edge of one piston Fig. 8 is a fragmentary front view of the engine 35 6 times the opening and closing of the cylinder with the cover and gasket removed. intake ports at belt 3, the upper edge of the Referring to Figs. 1 and 2, O is the cylinder other piston 6 that of the cylinder exhaust ports and crankcase housing case in One piece providing at belt 32, While the lower edges of both pistons cylinders 55, 56 and crankcase 5. At is seen 6, 6 time the opening and closing of the crank a boss forming the bearing for the shaft 2 of 40 case intake ports at belt. 30. the rear crankshaft assembly 3. At portion 4 Also terminating in face 29 is gas and air inlet of the shaft is fastened a cam 5 adapted to conduit 35 located in between the cylinders and operate an ignition timer f6 in the conventional in communication with crankcase intake port fil36. belt 3 on One Side and air inlet bore 36 on the Rear Crankshaft a SSembly 3 consists in addi 45 other side, said air inlet bore being part of cover tion to shaft 2 of a crankcheek f having a bore 3, as best seen in Figs. 1 and 5. Coaxial with 8 Which fits crankpin 9 of front crankshaft said air inlet bore 36 is located needle 38, the assembly 20 and thereby has the motion of the pointed portion of the needle serving as a valve front crankshaft imparted to it. Rear shaft 2 for gasoline jet hole 39. This jet hole is located has a notch 2 into which the material of die-cast 50 in vertical gasoline conduit 4 the inner end of cheek flows thereby providing a positive torque the conduit being in open communication with transmitting device besides confining the cheek the interior of fuel tak . Needle valive 38 is in its correct axial position on shaft 2. Operable by turning Screw knob 42 in the con Fabricated in a similar manner is front crank Ventional manner. This novel arrangement elim shaft 20, i. e., crankpin 9 and front shaft 22 and 55 inates all Outside piping and the danger of break 2,451,322 3 4 age of it and considerably contributes to a clean details of construction may be made without de and compact appearance of the whole engine parting from the scope of the invention as indi assembly. cated by the appended claims. - During the operation of the engine the vacuum For instance, in Diesel operation of the engine, Created in the crankcase by the outgoing pistons the usual injector Will replace the spark plug in causes air to be drawn through air intake hole 36 opening 59. Various sizes of engines may be built the nonent the lower piston edges uncover the although the form shown is particularly adapted sleeve ports which are in communication. With the for Small powers, With a piston diameter of one crankcase air inlet belt 30. This air rushes past inch the dual cylinder unit shown develops about the gasoline jet hole 39 at a high velocity and un 0. three horsepower. - der a partial vacuum causing the gasoline to be I claim: drawn from the tank 4 up through conduit 4 and 1. An internal combustion engine comprising a olIt the jet 39 Where on its Way to the crankoase it housing having a pair of cylinders in U-formation is mixed With the air and thereby forming a co transverse to the shaft, a cover for said housing bustible mixture. The ingoing pistons compress 15 having an air intake opening, a needle Valve be this mixture up to the time the upper edge of the tween said cylinders and having its end in said intake piston uncovers the holes. 33 in the intake air intake opening to control the air and fuel cylinder sleeve Which are in communication with mixture. the cylinder intake port belt 3, when the com. 2. In a 2-cycle internal combustion engine, a pressed mixture is allowed to enter the cylinder 20 casting formed with a pltrality of cylinders, liners for scavenging via the connection between intake for said cylinders having ports for the passage port belt 3 and the crankcase, formed by trans of gases, belt passages in said casting completely fer channel 44 as best shown in Figs. 4, 7, 5, 6 and around each of said liners at said ports and hav 8. Exit of the burnt gases from the cylinder oc ing parallel sides extending to a face of said cast curs through the sleeve ports which are in con 25 ing, and a cover plate fastened to said face of said nection with cylinder exhaust belt 32 and exhaust casting over said passages. - - pipe 45 as best indicated in Fig. 5. 3. A 2-cycle internal combustion engine as set Cover 37 has integrally connected to it a bearing forth in claim 2 in which one of said belt passages extension 45, the connection being strengthened is an intake and the adjacent belt paSSage is an by ribs 46. The bearing extension has a bushing 30 exhaust. 47, the bushing being held by means of a threaded 4. An internal combustion engine comprising a nut 8 which nut also acts as a retainer for fuel cylinder and crankcase housing formed by an in tank 44, with gaskets 49 and 56 forming the seals. tegral casting and having a transverse face pro Fuel hose 5-4 connected to conduit 40 reaches to viding fuel passage openings, a cover means for the bottom of the tank with a length S for up 35 said face forming a wall for a fuel passage of said right engine installation and length L for inverted casting and provided with a fuel supply reservoir engine installation. In the latter case, tank 4 around a portion of the crankshaft, and a crank must be rotated 180°, so as to maintain a top lo shaft journaled in said casting and said cover cation for filler cap 52.