MONOBLOCK FOR AN INTERNAL COMBUSTION ENGINE OF MULTIPLE CYLINDERS
BACKGROUND OF THE INVENTION The invention relates to a monoblock of a multi-cylinder internal combustion engine that includes cylinder walls at least partially surrounded by a cooling water jacket and a lubricating oil circuit that includes a mounted oil cooler. on one side of the monoblock. DE 40 29 408 A1 discloses a monoblock of a multi-cylinder internal combustion engine in which the walls of the cylinder of the monoblock are surrounded by a cooling water jacket extending longitudinally along the monoblock and having walls of cooling. shirts arranged at a distance from the walls of the cylinder. Mounted on the wall of the cooling water jacket on the side of the monoblock, it has an oil cooler housing which includes an oil cooler of the lubricating oil system of the internal combustion engine. With regard to the additional general background information reference is also made to patent publication DE 44 00 952 Cl.
It is the object of the present invention to provide a monoblock which includes, integrated in a highly compact arrangement, the oil cooler with the cooling water jacket and with the cooling water circuit. COMPENDIUM OF THE INVENTION In a monoblock of a multi-cylinder internal combustion engine with in-line cylinders, wherein a cooling water jacket surrounds the cylinders that is formed between the cylinders a wall of the cooling water jacket, a box of water is integrally molded with the monoblock on one side of the wall of the cooling water jacket to receive an oil cooler and the wall of the cooling water jacket extends at least partially between and separates the space of water from the water box and the water shirt. With a water box molded on the side of the monoblock that receives the oil cooler the arrangement is very compact. At the same time, the oil cooler with the surrounding water jacket integrates well with the cooling water circuit of the internal combustion engine. Preferably, the cooling water jacket of the motor is laid between the upper end of the cylinders and the lower end of the cylinder walls without moving the water box so that the flow of the cooling water and the cylinder cooler remain completely functional However, the wall of the cooling water jacket has suitable openings for fluid communication between the cooling water space formed by the jacket and the water box that receives the oil cooler. Depending on the dimensions of the oil cooler and the water box and the cross sections of the flow, it is possible to influence the cooling water to flow into the water jacket in the area adjacent to the water box. If the conduits are provided between the adjacent cylinders that provide opposite fluid communication between the water jacket areas they improve the cooling of the cylinders since the heat is also removed from the areas between the adjacent cylinders where they could otherwise occur peaks of relatively high temperatures. As a result, the cooling and expanding heat of the cylinders is more uniform. Additionally, it is advantageous if the joint rhe adjacent to the water box and wall of the cooling water jacket of the wall structure has reinforced areas and threaded holes extending through the reinforced wall area to receive bolts from the wall. mounting of the cylinder head. This allows for a relatively inexpensive and relatively simple mounting arrangement for the cylinder head.
With an arrangement where the oil cooler is mounted on a removable cover of the water box and all oil cooler connections are also mounted on the cover, the oil cooler and the cover can be manufactured as a module. Also, assembly and separation of the oil cooler is greatly facilitated. Preferably, the monoblock with the walls of the water jacket and the water box are molded as a single piece using a single molding core representing the volume of water including the water box the cooling water jacket area and the cooling water ducts. Said core can be made in one piece using, for example, the Croning process of shape concealment, in a simple and inexpensive way. Additional aspects and advantages of the invention will become apparent from the following description based on the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a longitudinal cross-sectional view of a monoblock with the structure of the crankcase taken in a plane extending normal to the axes of the cylinders of an internal combustion engine of multiple cylinders showing in a side of the cylinders a water box molded integrally with an oil cooler arranged therein. Figure 2 is a cross-sectional view taken along line II-II of Figure 1, and Figure 3 is a cross-sectional view taken along line III-III of Figure 1. DESCRIPTION IN A PREFERRED MODE Figure 1 shows a monoblock 1 of a multi-cylinder internal combustion engine not shown in detail but including cylinders 2, 3, 4 and 5, formed by cylinder walls 2 ', 3' , 4 'and 5' which are surrounded by a cooling water jacket 7. The cooling water jacket 7 is formed by at least one cooling water jacket wall 10 and the walls of the cylinder 2 '-5'. On the other side of the monoblock 1, it has an oil cooler 8 which is received in a water box 9 molded integrally on one side of the monoblock 1. The oil cooler is part of a lubricating oil circuit of the internal combustion engine which however it is basically known and therefore not described in detail. On the side 11 of the monoblock 1 opposite to the water box 9, it is provided with reception holes 12, 13, 14, 15 for plugging the fuel injection pumps which however are not illustrated. Those that receive the axes of the respective cylinders and are arranged so that the piston ends of the pump plugs when mounted in the holes are operated by the cams of a camshaft supported by the bearings 16 (see Figures 2). , 3) on the side of the monoblock 1. Between the cylinders 2, 3, 4 and 5 and the reception holes 12, 13, 14 and 15 associated with the plugs of the pumps, are provided with conduits 18, 18 '; 19, 19 '; 20, 20 'and 21, 21' which are inclined with respect to a plane that receives the axes of the cylinders and through which the push rods extend, which however are not shown. The push rods have at one of their ends arranged in coupling with the cams of said camshaft and at their other ends in engagement with the oscillating rocker supported on the cylinder head for the operation of the intake and exhaust valves in a form generally known in the art. The cooling water jacket 7 is defined by the external circumference 2 '-5' of the walls of the cylinder and the wall 10 of the cooling water jacket is disposed at a distance from the walls of the cylinder 2 '-5' and in a direction parallel to the axes of the cylinders 2b-5b and longitudinally along the motor.
A section 22 of the cooling water jacket wall 10 also forms a partition wall between the cylinders and the water box 9. In section 22, the cooling water jacket wall 10 has openings 23 by which fluid communication is provided between the cooling water jacket 7 and the water box 9. The cooling water ducts 24, 25, 26 are routed through the wall structure between the walls 2 ', 3'; 3 ', 4' and 4 ', 5' of adjacent cylinders that provide fluid communication between the sections 27, 28 of the water jacket 7 disposed on the opposite sides of the cylinders in the longitudinal direction of the motor. In the areas of the wall sections 22 of the cooling water jacket wall 10 when the water box 9 is attached to the wall section 22, rib-like wall reinforcement structures 29 are provided (see Figures 2, 3) and the threaded holes extend within these wall reinforcement structures 29 to receive the mounting bolts of a cylinder head which is not shown. The monoblock 1 as shown has the advantage that it can be manufactured by an aluminum die molding process using a one piece core representing the cooling water box 9, the cooling water jacket 10 and the channels 24 -26 cooling water and that can be made as a single piece by the Croning process of shape concealment. A water pump that is not shown provides for forced circulation of the water within the cooling water circuit where the water pumped by the water pump enters the monoblock 1 by a front end 30 thereof by means of a first input 31 which leads the water inside the water box 9 and by means of a second inlet 32 which carries the water to the water jacket 7. The main water flow directions within the water box 9 and inside the water jacket 7 are essentially the same. The oil cooler 8 is mounted on a cover 33 of the water box 9 (see Figure 2) and the connections for the intake of the lubricating oil to be cooled and the removal of the cooled lubricating oil are also mounted on the cover 33. The cover 33 is mounted on the water box 9 by means of screws that are threaded into the threaded holes formed within the reinforcing structures 38 molded on the walls of the water box 9. The oil cooler 8 is combined with the cover 33 within a single unit so that it can be assembled and removed together with the cover 33. The cooling water flows through the cooling water jacket 7 and the water box 9 it extends from the two front end inlets 31 and 32 as a cylinder, and reinforcement ribs formed on the bottom wall of the cylinder head in said water space, said reinforcing ribs extending between, and joined, to the columns of adjacent supports and channels for gas flow to form a rigid composite structure. A cylinder head according to claim 1, wherein said reinforcing ribs extend at an angle with respect to the longitudinal axis of said cylinder head. 3. A cylinder head according to claim 1, wherein said intake channel and the exhaust channel of each cylinder are each interconnected by a reinforcement rib with a support column.
2, there is a bearing support structure 34 for a crankcase bearing 35 of a crankcase not shown. As shown to the right of Figure 2 on the bearing support structure 34, it has a bearing 16 of the camshaft that is not shown, the cam bearing 16 and the crankcase bearing 35 are supplied with lubricating oil by an oil supply conduit 39 which is shown in dashed lines. The section 27 of the cooling water jacket 7 arranged along the sides of the cylinders in the direction of the longitudinal axis 6 of the monoblock 1 extends essentially parallel to and along almost the entire height of the cylinders 2-5. Near the upper end of section 27 of the water jacket, there is a duct 27a for each cylinder 2-5 leading to the cooling water channels in the cylinder head and at the lower end, has a depression 27b extending down to a point closely adjacent to the oil duct 17 Main lubricant extending in the monoblock 1 in the direction of the longitudinal axis 6 thereof whereby also the lubricating oil in the main lubricating oil conduit is cooled to a certain degree. In particular, the cooling water jacket of the section 22 of the cooling water jacket wall 10 adjacent the water box 9 extends on the cylinder axis 2a or respectively, 2b of the cylinders 2 or 3 and, in the longitudinal direction of the motor, from the upper end 37 of the monoblock 1 downwards of the water box 9. Below the flow conduit 27a, the reinforcing structure 29 is shown with the threaded holes for receiving the mounting bolts of the cylinder head. The reinforcing structure 29 results in only a relatively small reduction in the flow cross section of the cooling water jacket 7 but this substantially increases the rigidity of the cooling water jacket wall 10. Figure 3 is a cross-sectional view taken along the line III-III of Figure 1, however, the oil cooler 8 is not shown. The identical components are indicated by the same reference numerals as in Figures 1 and 2. On the upper side of the monoblock 1 adjacent to the cylinder head the reinforcing structures 29 with the threaded holes for connecting the bolt of the cylinder head are They show clearly. The cooling water passage 24 providing the flow connection between the two water jacket sections 27 and 28 of the cooling water jacket 7 includes, in addition to the openings 23 of the water box 9 (see Figure 1) , also an opening 23 'disposed below the reinforcing structure 29 serves as a flow connection to the water box 9. Between the two reinforcement structures 29, the cooling water duct 24 has at its upper end a curved area 40 which limits the water jacket 7. Below the curved area 4 near the middle of the cooling water duct 24, it has a support pin 36 which extends between and secures the walls 2 'and 3' of the adjacent cylinder (Figure 1). The support pin 36 is integrally molded with the monoblock.