JP2009222061A - Internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine wherein an improved oil is returned so as to achieve suitable oil suction from a cylinder head to an oil collection container. <P>SOLUTION: In the internal combustion engine 1 for a vehicle having at least: one cylinder head 2; one crankcase 3; one oil pump 4; and one oil collection container 5 arranged under the internal combustion engine, return lines 6, 7 are arranged on the cylinder head 2 so as to feed a lubricant from the cylinder head 2 to the oil collection container 5, the return lines 6, 7 are formed to be unified to the cylinder head 2 and the crankcase 3, and a plurality of suction sections 8, 8a are arranged on the cylinder head 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an internal combustion engine having a device for returning the lubricating oil according to the superordinate concept of claim 1.

  In the case of recent internal combustion engines, a plurality of collection lines are provided in order to return the lubricating oil from different areas of the engine, and a suction connection is usually provided at the end of these collection lines. Patent Document 1 discloses a boxer type internal combustion engine. In the case of this internal combustion engine, two collection lines are provided in the cylinder head in order to return the lubricating oil from the cylinder head, and these collection lines are separated from each other. Are formed and positioned in parallel. Both collection lines extend in the longitudinal direction of the cylinder head, and only the collection line located inside is connected to the internal space of the cylinder head. The collection line located outside is connected to the collection line located inside through the hole. In this case, one suction connection portion (suction location) is provided at the end of each collection line on the same end face side of the cylinder head, and this suction connection portion causes the lubricating oil to flow back to the oil pan. Connected with. However, in this case, a direct connection between the collection line located outside and the internal space of the cylinder head is a disadvantage. Furthermore, a very large gap is created between the suction connection and the oil collection point in a given driving situation. Therefore, rapid oil return from the cylinder head or proper oil suction is not possible, especially during dynamic running conditions, i.e. deceleration and acceleration.

German Patent Application Publication No. 198 28 307

  The problem underlying the present invention is therefore to provide an improved oil return for the internal combustion engine so as to achieve optimum oil suction from the cylinder head to the oil collecting container.

  This problem is solved by an internal combustion engine having the features described in the characterizing part of claim 1. In the internal combustion engine according to the present invention, the oil collecting line includes a plurality of suction points, and at least one suction point is positioned in the front portion of the cylinder head with respect to the longitudinal axis or the traveling direction of the vehicle, and at least one other The suction point stands out by being positioned in the rear part of the cylinder head. The intent of the present invention is to have one, two or more suction points in the rear part and in the front part of the cylinder head, respectively, if necessary for the purpose of the internal combustion engine type. Positioning is possible. In this case, the number of suction locations in the rear portion and the front portion of the cylinder head need not be the same. Similarly, one or more suction points can additionally be provided in the intermediate part between the rear part and the front part of the cylinder head.

  By arranging multiple suction points in the oil collection line positioned on the cylinder head, optimized oil suction and therefore quick oil return can be obtained in dynamic driving conditions such as deceleration, acceleration and curve driving. It is done. Since the oil suction location of the cylinder head is directly connected to the return line in the cylinder head or on the cylinder head surface, the oil recirculation through the oil pump positioned so as to be in close contact with the crankcase However, this is done most appropriately and the oil circulation is further accelerated by directly placing an aged pump in the oil collecting container.

  The present invention is based on the general idea that the cylinder head is provided with an oil collecting line having a direct connection with the internal space of the cylinder head. Since the lubricating oil in the oil collection line in the cylinder head is usually concentrated in the front part of the cylinder head or the rear part of the cylinder head depending on the running state, the respective suction connection parts or suction points are appropriately arranged in the oil collection line. By arranging according to the present invention at this location, the lubricating oil present therein can be sucked out without delay. Since the cross section of the return line is smaller than that of the oil collecting line, the return of the lubricating oil from the cylinder head to the oil collecting container is surely performed.

  In one embodiment of the present invention, one return line is provided for each of the suction portion of the front portion of the cylinder head and the suction portion of the rear portion of the cylinder head, whereby lubrication at the front portion of the cylinder head is performed. Oil suction can be carried out independently of the rear part of the cylinder head. Therefore, the optimized return of the lubricating oil from the portion of the cylinder head where the lubricating oil collects according to a predetermined traveling state can be obtained quickly.

  In another form of the invention, at least one of the return lines is configured to be integrated into the cylinder head and / or crankcase. This shortens the return route and provides an inexpensive return line. In particular, the return path is positioned so that the return line is located inside the cylinder head and inside the crankcase and / or along the end face of the cylinder head or crankcase. If extended, it is further shortened. Thereby, an unused space for the oil return line is used in the internal combustion engine, so that a compact structure of the internal combustion engine with reduced weight can be achieved.

  In one form of the invention, at least a portion of the one or more return lines are configured to be integrated into the cylinder head or cylinder head cover. This part connects the suction point located away from the end face of the cylinder head from which the return line extends to the corresponding return line. Preferably, this part is formed as a connection path in the cylinder head or its surface or in the cylinder cover.

  According to an advantageous embodiment of the invention, the suction area of the front part of the cylinder head is directly connected to the connection path, which is preferably formed so as to be integrated into the cylinder head or the cylinder head cover. .

  In another form of the invention, a chain case is positioned or integrated in the cylinder head, and one suction location is positioned in the chain case, depending on the suction location, the chain case and the cylinder head or adjacent thereto. The lubricating oil is sucked out from the cylinder head portion, preferably the rear portion of the cylinder head. Accordingly, the lubricating oil can be sucked out simultaneously from the rear portion of the cylinder head and the chain case. In addition, due to the separate transfer of lubricant from the forward part of the proposed cylinder head and the chain case, each end of each return line was dimensioned according to the amount of oil in each part of the internal combustion engine A separate suction step can be provided. Preferably, the oil pump is formed as a module and has at least one pressurization step as well as a plurality of suction steps. The formation of a plurality of separate return lines allows a modular structure of the oil pump, so that the plurality of suction steps optimize the oil pump sizing according to the amount of oil present in each part.

  According to another advantageous embodiment of the invention, at least one oil / air separation device is provided in the oil collection container, before the lubricating oil is returned to the oil collection container via this oil / air separation device. Then, the lubricating oil sucked from the cylinder head and / or the chain case flows. By arranging the oil / air separation device in the collecting container, the lubricating oil sucked directly from the cylinder head can be settled and sent back without having an air component in the oil collecting container.

  In one form of the invention, the oil pump is secured to the flange surface of the lower crankcase of the oil collection container, preferably the oil pump is positioned within the oil collection container. In this case, it is conceivable to surround the oil pump with lubricating oil. As a result, the suction of the lubricating oil from the cylinder head is accelerated by the return line integrated with the cylinder head and the crankcase. Therefore, by providing a plurality of suction points on the cylinder head, it is possible to return to the standard oil in a dynamic traveling state such as deceleration, acceleration and curve traveling. Since the oil suction location of the cylinder head is directly connected to the return line in the cylinder head, the oil recirculation is very quick even in dynamic running conditions via an oil pump positioned closely to the crankcase. Particularly advantageously, the oil recirculation is additionally accelerated by arranging the oil pump directly in the oil collecting device.

  Further features and combinations of features can be seen from the following description and drawings illustrating preferred embodiments of the invention.

1 shows a side view of an internal combustion engine according to the present invention. FIG. 2 shows a diagram of an oil circuit of the internal combustion engine described in FIG. 1. The figure of the oil circuit in the cylinder head of the internal combustion engine described in FIG. 1 is shown. The top view of the oil circuit in the cylinder head of the internal combustion engine described in FIG. 1 is shown. 2 shows a diagram of a return line of an oil circuit in a cylinder head of the internal combustion engine shown in FIG. The figure seen from the return line of the oil circuit in the cylinder head of the internal combustion engine of FIG. 1 is shown. The figure of the oil pump of the internal combustion engine described in FIG. 1 is shown. FIG. 2 shows another view of the oil pump of the internal combustion engine shown in FIG. 1.

  The internal combustion engine 1 illustrated in FIG. 1 is formed as a boxer type internal combustion engine 1 in which an oil pan 5 is disposed under both crankcase halves 3. The internal combustion engine 1 is preferably attached to a vehicle in a traveling direction F (not shown). The crankcase of the six-cylinder boxer engine shown in cross-section according to FIG. 1 is not limited to this embodiment, but comprises two crankcase halves 3 having two cylinder bank rows arranged horizontally. One cylinder head 2 provided with a cylinder head cover 23 according to FIG. 3 is arranged on the right and left of both crankcase halves 3 or on the side of both crankcase halves 3. During operation of the internal combustion engine 1, a tappet (not shown) or a rotating camshaft vibrates in the cylinder head 2, and lubricating oil flows out from these support points and concentrates in the oil collection line 19 according to FIG. 4. The oil collecting line 19 is disposed on the longitudinal axis of the internal combustion engine 1 or the traveling direction F of the vehicle. During the operation of the internal combustion engine 1, in order to collect the lubricating oil in the oil collecting line 19 and suck out the lubricating oil from the oil collecting line 19, two suction points 8 or 8a and two return lines 6 and 7 are provided. It has been.

  According to the present invention, the first suction location 8 is positioned at the front portion 20 of the cylinder head 2 with respect to the traveling direction of the vehicle, and the second suction location 8a is located at the rear portion 21 of the cylinder head 2. It arrange | positions so that the 1st suction location 8 may be faced. In this case, the second suction portion 8 a is provided in the chain case 24 disposed in the cylinder head 2. Accordingly, the lubricating oil is sucked out from the chain case 24 and the cylinder head portion 21 adjacent thereto at the rear portion 21 of the cylinder head. Thereby, the lubricating oil can be sucked out simultaneously from the rear portion 21 of the cylinder head and the chain case 24.

  With the return lines 6 or 7 formed separately, the suction of the lubricating oil at the front portion 20 of the cylinder head is performed independently of the suction of the lubricating oil at the rear portion 21 of the cylinder head. As shown in FIGS. 1, 3 and 4, the return lines 6 and 7 extend into the cylinder head 2 and the crankcase 3. These return lines are formed so as to be integrated with both the cylinder head 2 and the crankcase 3 and are positioned so as to be located inside. In this case, the partial section 22 of the return line 7 is integrated with the cylinder head cover 23 and formed as a connection path. In this case, the suction portion 8 of the front portion 20 of the cylinder head is directly connected to the connection path 22. Nevertheless, according to the present invention, the connection path 22 can also be formed so as to be integrated into the cylinder head 2 instead of the cylinder head cover 23.

  The arrangement according to the invention of both suction points 8 or 8a ensures that the lubricating oil in both the front part 20 and the rear part 21 of the cylinder head 2 does not depend on where the lubricating oil is concentrated depending on the running conditions. Allows sucking. When the vehicle, and thus the internal combustion engine 1, is accelerated on the right curve, the lubricating oil concentrates on the rear portion 7 of the left cylinder head where the suction points 8a are present. On the other hand, when the vehicle, and thus the internal combustion engine 1 is decelerated on the right curve, the lubricating oil concentrates on the front part of the cylinder head where the suction point 8 exists. Accordingly, the lubricating oil is quickly returned from each cylinder head portion where the lubricating oil is collected.

  In order to further optimize the oil circuit, the oil pump 4 is arranged in the oil collecting container 5 in the present invention. The oil pump 4 shown in FIG. 1 comprises an upper flange surface 25 that abuts the lower flange surface 16 of the crankcase according to FIG. In this case, the oil pump 4 is configured as a module comprising a plurality of suction steps 10 and one pressurizing step 9 according to FIGS. As shown in FIG. 1, by arranging an oil pump 4 between the crankcase 3 and the oil oil pan, direct and thus quick return of the lubricating oil from the cylinder head 2 can be achieved. is there.

  Due to the modular structure of the oil pump 4, it is possible to separately suck out the lubricating oil from the cylinder head 2. In this embodiment, four separate suction steps 10 are provided for the suction of lubricating oil from each cylinder head portion 20 or 21. Accordingly, it is possible to quickly suck out the lubricating oil from the two different suction locations 8 and 8a on the left and right of each cylinder head. Thereby, it is comprised so that the suction of the oil in all the driving | running | working states may be optimized. Preferably, the oil pump 4 is provided with an additional suction step 28 for an exhaust turbocharger not shown. Since the lubricating oil sucked from each cylinder head 2 is transferred to the two oil / air separation devices 11 by the suction step 10 of the oil pump 4, the lubricating oil sucked from the cylinder head 2 is defoamed. In this embodiment, one oil / air separation device 11 is provided under the oil pump 4 for each cylinder head 2. The lubricating oil sucked out from the cylinder head 2 by the four suction steps 10 joins the collecting path under the oil collecting container 5, and then almost half is distributed to both oil / air separators 11. It is thus ensured that the lubricating oil is distributed to both halves of the oil collecting container 5. In this case, the both oil / air separators 11 are positioned in the right outside and left outside of the oil collecting container 5, preferably in a horizontal position, so that both oils can be used even during curve running and / or deceleration and acceleration. / At least one of the air separation devices is arranged to be at or above the oil level. Next, the defoamed lubricating oil flows into the oil collecting container 5. As a result, reliable separation of oil and air in the oil / air separator is ensured. Through the pressurizing step 9 of the oil pump 4, the lubricating oil is again sucked by the suction snorkel 15 and distributed to the location 27 under the corresponding internal combustion engine 1.

  By forming the oil circuit of the internal combustion engine 1 according to the present invention, it is possible to prevent the lubricating oil from being collected in the cylinder head 2 and the chain case 24 by both rapid acceleration and rapid deceleration. By arranging a plurality of suction points 8 and 8a of the cylinder head 2 connected to the oil pump 4 by separate suction steps 10, it is guaranteed that the lubricating oil collected in the cylinder head 2 is quickly sucked even during acceleration or curve driving. Is done. Furthermore, the oil circuit of the internal combustion engine 1 has an oil module 12 in which an oil filter device 18 is disposed. The blow-by gas sucked from the crankcase degassing line 14 is supplied to the oil module 12, which includes an oil filter device 18, an oil pre-separation device 13 in the form of a chamber, an oil-water heat exchanger 17 and a minute oil. It has a console with a separation device 26 attached.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder head 3 Crankcase half body 4 Oil pump 5 Oil pan, oil collection container 6,7 Return line 8 1st suction location 8a 2nd suction location 9 Pressurization step 10 Suction step 11 Oil / air separation 11 Device 12 Oil module 13 Oil pre-separation device 14 Crankcase deaeration line 15 Suction snorkel 16 Flange surface 17 Oil water heat exchanger 18 Oil filter device 19 Oil collection line 20 Cylinder head front portion 21 Cylinder head rear portion 22 Partial section , Connection path 23 cylinder head cover 24 chain case 25 flange surface 26 minute oil separator 27 location under the internal combustion engine 28 suction step F travel direction

Claims (13)

One cylinder head (2), one crankcase (3), at least one oil pump (4), and one oil collecting container (5) disposed under the internal combustion engine, In order to return the lubricating oil from the cylinder head (2) to the oil collecting container (5), the return line (6, 7) is arranged in the direction of the longitudinal axis of the vehicle positioned in the cylinder head (2). An internal combustion engine (1) for a vehicle provided with an oil collection line
The oil collecting line (19) comprises a plurality of suction points (8, 8a), with respect to the longitudinal axis of the vehicle, at least one suction point (8) is positioned in the front part (20) of the cylinder head (2) An internal combustion engine characterized in that at least one further suction point (8a) is positioned in the rear part (21) of the cylinder head (2).   One return line (6, 7) is provided for each of the suction part (8) of the front part (20) of the cylinder head (2) and the suction part (8a) of the rear part (21) of the cylinder head (2). Accordingly, the suction of the lubricating oil at the front portion (20) of the cylinder head can be performed without depending on the suction of the lubricating oil at the rear portion (21) of the cylinder head. The internal combustion engine according to claim 1.   The internal combustion engine according to claim 1 or 2, characterized in that at least one of the return lines (6, 7) is formed so as to be integrated into the cylinder head (2) and / or the crankcase (3). .   The return line (6, 7) is positioned so as to be located at least partly inside the cylinder head (2) and inside the crankcase (3). An internal combustion engine according to any one of the above.   5. The internal combustion engine according to claim 1, wherein the return line (6, 7) extends at least partly along the end face of the cylinder head (2).   The at least part (22) of one return line (6, 7) is formed so as to be integrated with the cylinder head (2) or the cylinder head cover (23) as a connection path. The internal combustion engine according to any one of 1 to 5.   7. The internal combustion engine according to claim 1, wherein the suction part (8) of the front part (20) of the cylinder head (2) is directly connected to the connection path (22). .   A chain case (24) is positioned in the cylinder head (2), and one suction point (8a) is positioned in the chain case, and the chain case (24) and the chain case (24) are adjacent to the suction point. The internal combustion engine according to any one of claims 1 to 7, wherein the lubricating oil is sucked out from the cylinder head portion (21).   The oil pump (4) is formed as a module and has at least one pressurization step (9) and a plurality of suction steps (10). Internal combustion engine.   At least one oil / air separation device (11) is provided in the oil collection container (5), before the lubricating oil flows back to the oil collection container (5). The internal combustion engine according to any one of claims 1 to 9, characterized in that the lubricating oil sucked from the head (2) and / or the chain case (24) is transferred.   The internal combustion engine according to any one of claims 1 to 10, wherein the oil pump (4) is fixed to a flange surface of a crankcase on the lower side of the oil collecting container (5).   The internal combustion engine according to any one of claims 1 to 11, characterized in that the oil pump (4) is positioned in the oil collecting container (5).   The internal combustion engine according to any one of claims 1 to 12, wherein one or a plurality of suction points are additionally arranged in an intermediate part between the rear part and the front part of the cylinder head. organ.

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