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(12) United States Patent (10) Patent N0.: US 6,321,698 B1 Rau Et Al

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(12) United States Patent (10) Patent N0.: US 6,321,698 B1 Rau Et Al US006321698B1 (12) United States Patent (10) Patent N0.: US 6,321,698 B1 Rau et al. (45) Date of Patent: Nov. 27, 2001 (54) INTERNAL COMBUSTION ENGINE 1024825 * 4/1953 (FR). 121605A * 5/1919 (GB) ................................. .. 123/551 (75) Inventors; Erhard Rau, We?heim; Wilhelm 97/40267 * 10/1997 (WO) ..................................... .. 75/22 Huettner, Waiblingen; Joerg Abtho?', Pluederhausen, all of (DE) OTHER PUBLICATIONS (73) Assignee; Daimlerchrysler AG, Stuttgart (DE) “18—Zylinder von Volkswagen”, Autos Test Technik, mot No. 11, ISSN 0027—1462, pp. 16—23, (May 15, 1998). ( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 * cited by examiner U.S.C. 154(b) by 0 days. Primary Examiner—Noah P. Kamen (21) Appl- NOJ 09/369,225 Assistant Examiner—Hai Huynh (22) Filed Aug 5 1999 (74) Attorney, Agent, or Firm—Kenyon & Kenyon . , _ _ (57) ABSTRACT Related US. Application Data (60) Provisional application No. 60/095,774, ?led on Aug. 7, An internal combustion engine having four individual cyl 1998- inder banks, in each case tWo cylinder banks being arranged (51) Int. c1.7 .................................................... .. F02B 75/22 in a V-éharw With respect to one another in such a Way that (52) us CL 123/54_4 the cylinder banks forming a V are disposed on both sides (58) Field of i i i i i i 4 1 54 4 of one engine plane E de?ned by a vertical aXis H that 123/54 8 55 1 54 6 54 7 54 2 symmetrically divides the internal combustion engine and ' ’ ' ’ ' ’ ' ’ ' by a longitudinal aXis L of the internal combustion engine, (56) References Cited one cylinder bank of the cylinder banks that are associated With one another in a V-shape being con?gured closer to the US. PATENT DOCUMENTS engine plane E or the vertical aXis H than the cylinder bank that is diametrically opposed With respect to the engine 2,927,565 * 3/1960 Turner ............................... ..123/54.4 . 2929 368 * 3/1960 Payne 123/54 4 plane E. The present invention is intended for use in 2,990,819 4 7/1961 Bouvy _____ __ 123/544 mixture-compressing internal combustion engines having 5,937,804 * 8/1999 Kaminski .......................... .. 123/547 eXwrnally Supplied ignition, but also for air-Compressing, self-ignition internal combustion engines. FOREIGN PATENT DOCUMENTS 413933A * 8/1910 (FR) .................................. .. 123/551 2 Claims, 1 Drawing Sheet . , g”) U.S. Patent Nov. 27, 2001 US 6,321,698 B1 US 6,321,698 B1 1 2 INTERNAL COMBUSTION ENGINE FIG. 1 shoWs a schematic cross-sectional partial vieW of an embodiment of an internal combustion engine of the This application claims bene?t of provisional application present invention. No. 60,095,774 ?led Aug. 7, 1998 DETAILED DESCRIPTION FIELD OF THE INVENTION Illustrated in cross-section in the draWing is a partial vieW The invention relates to an internal combustion engine of an internal combustion engine having four cylinder banks having four cylinder banks arranged in a double-V con?gu 1, 2, 3, 4. The internal combustion engine can be a mixture ration. compressing internal combustion engine having externally supplied ignition, or also an air-compressing, self-ignition RELATED TECHNOLOGY 10 The article “18-Zylinder von Volkswagen” (18-Cylinder internal combustion engine. Accommodated in each cylinder by Volkswagen) in Autos Test Technik (Auto Test bank 1, 2, 3, 4 is at least one piston 5. Thus, designs are Technology), mot, no. 11, ISSN 0027-1462, pages 16 to 23, possible having four, eight, tWelve, sixteen, tWenty, tWenty (May 15, 1998) discloses an internal combustion engine four or more pistons 5 or cylinders. Provision is made in the exemplary embodiment for tWenty cylinders, so that a Which has eighteen cylinders that are accommodated in three 15 cylinder banks. Each cylinder bank accommodates six pis cylinder bank 1, 2, 3, 4 contains, correspondingly, ?ve tons. Four gas exchange valves per cylinder are controlled pistons 5. via six camshafts located above. Eighteen connecting rods TWo cylinder banks 1, 2 and 3, 4 are each arranged in a are received by a crankshaft, three connecting rods engaging V-shape, forming a double-V con?guration. It turns out that With one crankshaft throW. The three cylinder banks are 20 When tWenty or tWenty-four cylinders are used, a manufactured as an integrally cast aluminum part. The V-con?guration is advantageous Where cylinder banks 1, 2 complex geometry of this part makes a casting operation or 3, 4 form an angle 0t of about 72 degrees. When Working very costly. The three cylinder banks are con?gured radially, With an internal combustion engine having tWelve or sixteen one vertical cylinder bank being bisected by a plane of the cylinders, an angle 0t of about 90 degrees turns out to be internal combustion engine de?ned by a vertical axis and a 25 bene?cial. longitudinal axis of the internal combustion engine. The External cylinder banks 1, 4, and internal cylinder banks other tWo cylinder banks are con?gured symmetrically to the 2, 3 are arranged symmetrically to a vertical axis H, Which engine plane. Since there are only three cylinder banks, a divides the internal combustion engine into tWo uniform relatively large number of pistons must be accommodated in halves. Vertical axis H and a longitudinal axis L, Which in one cylinder bank. This results in large dimensions in the 30 the draWing is perpendicular to vertical axis H and extends longitudinal direction, the consequence being, on the one into the draWing plane, de?ne an engine plane E that is hand, a relatively substantial Weight of the internal combus indicated in perspective vieW in the draWing. According to tion engine and, on the other hand, unfavorable crash the present invention, the con?guration of cylinder banks 1, performance due to long front ends of the automobile body. 2, 3, 4 is such that in each case one cylinder bank 2 or 3 of SUMMARY OF THE INVENTION 35 a corresponding V-arrangement 1, 2 or 3, 4 is disposed closer The present invention provides an internal combustion to engine plane E than the its corresponding diametrically engine comprising a plurality of cylinders, Which are opposed outer cylinder bank 1 or 4. The result in the area of divided into cylinder banks, comprising at least one cam vertical axis H is that the tWo inner cylinder banks 2, 3 run shaft for controlling at least tWo gas exchange valves at a relatively narroW distance from one another. As a result, provided per cylinder, and comprising a crankshaft for 40 an especially compact and, thus, light design of the internal receiving corresponding connecting rods. Four individual combustion engine is rendered possible. An angle y formed cylinder banks (1, 2, 3, 4) are provided, With tWo cylinder betWeen vertical axis H and inner cylinder bank 2 or 3 is, for banks (1, 2 or 3, 4) being arranged in a V-shape With respect example, 15 degrees. On the other hand, the diametrically to one another in such a Way that the cylinder banks (1, 2 or opposed, external cylinder banks 1, 4 shoW a greater dis 3, 4) forming a V are con?gured on both sides of one engine 45 tance to engine plane E than do inner cylinder banks 2, 3, an plane E. One cylinder bank (2 or 3) of the cylinder banks (1, angle [3 of, for example, 57 degrees being formed by vertical 2 or 3, 4) that are associated With one another in a V-shape axis 11 to external cylinder bank 1 or 4. is con?gured closer to the engine plane E than the cylinder Visible in section are four connecting rods 10, 11, 12, 13, bank (1 or 4) that is diametrically opposed With respect to Which are secured to throWs (offset bends) of a crankshaft the engine plane E. 50 17, at least tWo connecting rods 10, 12 or 11, 13 of a In contrast to prior designs, the internal combustion V-arrangement of cylinder banks 1, 2 or 3, 4 being mounted engine of the present invention has the advantage of a more on a shared throW. Another possibility consists in providing compact design With a relatively loW Weight in terms of the offset (staggered) crank pins on the crankshaft, so-called siZe of the internal combustion engine and its number of split pins, Which are needed to compensate for an ignition cylinders. Also advantageous, moreover, is the fact that only 55 offset (ignition point discrepancy) When Working With the a short front end of the automobile body is required for the V-arrangement of tWo pistons on one shared crank pin of internal combustion engine, resulting in a favorable crash crankshaft 17. performance. Especially bene?cial, particularly given a cyl The internal combustion engine has at least tWo gas inder number of tWenty or more, is the attainable running exchange valves 20, 21 per cylinder; provision is preferably smoothness for the internal combustion engine. The bene?t 60 made for four gas exchange valves. Gas exchange valves 20, of a simpli?ed cylinder-head manufacturing is also derived 21 are controlled via push rods 22, 23, Which each lead to a from the design of four individual cylinder banks. camshaft 25. Provision is made in the exemplary embodi ment for tWo camshafts 25, Which are accommodated in the BRIEF DESCRIPTION OF THE DRAWINGS available interspace betWeen inner cylinder banks 2, 3 and An exemplary embodiment of the present invention is 65 outer cylinder banks 1, 4 and, vieWed in the radial direction elucidated in the folloWing description and shoWn in a from crankshaft 17, are disposed someWhat beloW gas simpli?ed version in the draWing, in Which: exchange valves 20, 21, thus closer to crankshaft 17.
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