阅读说明：本技术 具有废气再循环的内燃机 (Internal combustion engine with exhaust gas recirculation ) 是由 J·克洛斯特伯格 M·斯莱瓦 T·库尔特 O·施密茨 于 2020-03-10 设计创作，主要内容包括：描述了一种内燃机,所述内燃机具有曲轴箱(1)和气缸盖,所述内燃机包括至少一个气缸体、至少一个用于容纳至少一个冷却器(2)的平坦的法兰面、至少一个冷却器(2)、至少一个通向冷却器(2)的冷却剂入口、至少一个离开冷却器(2)的冷却剂出口(8)、至少一个通向冷却器(2)的废气入口、至少一个离开冷却器(2)的集成的废气流通部和至少一个内部的冷却路径(3)。(An internal combustion engine having a crankcase (1) and a cylinder head is described, comprising at least one cylinder block, at least one flat flange surface for accommodating at least one cooler (2), at least one coolant inlet to the cooler (2), at least one coolant outlet (8) from the cooler (2), at least one exhaust gas inlet to the cooler (2), at least one integrated exhaust gas recirculation from the cooler (2), and at least one internal cooling path (3).)

1. Internal combustion engine having a crankcase and a cylinder head, comprising at least one cylinder block, at least one flat flange surface for accommodating at least one cooler (2), at least one coolant inlet opening into the cooler (2), at least one coolant outlet opening (8) from the cooler (2), at least one exhaust gas inlet opening into the cooler (2), at least one integrated exhaust gas recirculation opening out of the cooler (2), and at least one internal cooling path (3).

2. An internal combustion engine according to claim 1, characterized in that the cooling path (3) has vortex generators.

3. The internal combustion engine according to one or more of the preceding claims, characterized in that the coolant inlet to the cooler (2) is embodied adjustable.

4. The internal combustion engine according to one or more of the preceding claims, characterized in that the exhaust gas inlet to the cooler (2) is embodied adjustable.

5. The combustion engine according to one or more of the preceding claims, characterized in that a flat flange face for accommodating the AGR cooler (2) is provided substantially on a longitudinal side of the crankcase (1).

6. The internal combustion engine according to one or more of the preceding claims, characterized in that a flat flange face for accommodating the AGR cooler (2) is provided substantially on the longitudinal side of the cylinder head.

7. Internal combustion engine according to one or more of the preceding claims, characterized in that a partition and/or a throttle device is interposed between the AGR cooler (2) and the crankcase (1).

8. The internal combustion engine according to one or more of the preceding claims, characterized in that the partition and/or throttling means interposed between the AGR cooler (2) and the crankcase (1) are realized in particular by cast fins (6) and cast ribs (7).

9. Method for operating an internal combustion engine, characterized in that an internal combustion engine according to one or more of the preceding claims is used.

Background

Such an internal combustion engine is known from DE 69130976T 2. Such internal combustion engines have an exhaust gas recirculation system with a distribution line which extends parallel to the fresh gas line. The fresh gas line has a branched fresh gas channel which leads to the respective two inlet valves of the cylinder unit. The distribution line opens into the fresh gas channel with a respective feed line. In known exhaust gas recirculation (AGR) coolers, the cooler of the motor is traversed and is here located directly in the form of a recess in the crankcase of the motor without its own housing. Lateral flow-through allows: the AGR cooler is provided with all the water volume of the motor due to the large cross-sectional area through which the water flows. Unlike longitudinal flow, water also undergoes a significantly smaller temperature rise. This arrangement is ideal in terms of cooling and pressure loss on the water side because of its operating principle.

A problem with this arrangement is that the AGR cooler component is not completely surrounded by the profile of the water jacket in the crankcase. So much water flows around the AGR cooler, which reduces the flow velocity through the cooler fins and thus the cooling effect.

The invention described below addresses the problem. The aim is to transport the water through the cooler and to minimize leakage losses. At the same time, the solution should be able to be implemented as inexpensively as possible without additional costs in production and installation.

Disclosure of Invention

The invention is based on the object of simplifying the installation of an exhaust gas recirculation device, in particular a distribution line, on an internal combustion engine and of improving the cooling effect.

This object is achieved with the features of the characterizing portions of claims 1 and 9.

It is advantageous here that the internal combustion engine is of very compact design and is capable of very efficient heat transfer without unnecessary piping.

In a further development of the invention, it is provided that the cooling path has vortex generators, which enable a better heat transfer.

In a further embodiment of the invention, it is provided that the partition and/or the throttle device is inserted into the passage. With these components, the amount of exhaust gas supplied to the individual cylinder units can be individually coordinated.

On the one hand, the cast fins are placed onto the inlet connection of the AGR cooler, and on the other hand, the cast ribs are fitted into the crankcase recess. The cast rib in the crankcase is brought close to the cast fin of the AGR cooler except for a small gap, as this is disclosed in fig. 1. In this way, the leakage cross section is strongly reduced in addition to the remaining gap. In order to reduce tolerance-induced variations in the gap width and thus to reduce the dispersion of the throttling effect, machining of the cast ribs is carried out on the crankcase side. Here, due to the small rib width, only little material is cut off and therefore the machining time of the crankcase is only marginally increased. In contrast, cast ribs on AGR coolers do not need to be machined, since the tolerances in the die casting are already sufficiently precise.

Leakage losses are minimized by means of this solution. In contrast, the flow velocity and thus the cooling effect on the AGR cooler are significantly increased or improved.

If the rear-side cast rib in the crankcase is drawn over the entire length of the AGR cooler, an additional guide plate on the rear side of the AGR cooler can also be omitted. This results in a cost saving that allows balancing the additional costs for machining the ribs on the crankcase.

Due to the following possibilities: the machining on the crankcase can be adjusted at any time, so that the change of the design of the AGR cooler can be responded to at any time.

Drawings

Further advantageous embodiments of the invention result from the drawing description, in which the exemplary embodiments of the invention shown in the drawings are described in greater detail. In the figure:

fig. 1 shows a perspective view of a crankcase with a cooling housing of an exhaust gas cooler of an exhaust gas recirculation device integrated into the crankcase;

FIG. 2 shows a side view of the AGR cooler according to FIG. 1;

FIG. 3 shows a cross-sectional view through the crankcase of FIG. 1 having an AGR cooling housing whose base is an integral part of the crankcase and wherein the base is covered by a cover;

fig. 4 shows a cross-sectional view through the crankcase along line C-C of fig. 3.

Detailed Description

Fig. 1 shows a cylinder block of a crankcase 1 of an internal combustion engine, which has a flat flange surface on its longitudinal side for receiving an AGR cooler 2. In the sealing plane of the flat flange surface, a coolant inlet opening 9 is provided in the region of the end face of the internal combustion engine, which coolant inlet opening passes the coolant to the cooler 2. In the immediate vicinity of the coolant inlet opening 9, the coolant outlet opening of the cooler 2 is also arranged in the sealing plane of the flange face. An exhaust gas inlet to the cooler is provided in the region of the other end face of the internal combustion engine in the sealing plane of the flat flange surface, said exhaust gas inlet passing exhaust gas to the cooler. In the immediate vicinity of the exhaust gas inlet to the cooler, the integrated exhaust gas flow-through of the cooler is also arranged in the sealing plane of the flange face. The inner cooling path has a nose-shaped elevation which, in cooperation with a flow guide element arranged on the cooler housing, effects a swirling flow of the coolant flowing around or between the nose-shaped elevation and the flow guide element. The exhaust gases from the cylinder head proceed via a channel guide in the cylinder head and are conveyed further via an exhaust gas inlet opening to an exhaust gas inlet by means of a channel connection in the crankcase 1. The exhaust gas arriving at the exhaust gas inlet is fed into a line guide in the AGR cooler 2 and there gives off its waste heat to the coolant. The cooled exhaust gases then leave the cooler 2 through the crankcase 1 in the direction of the exhaust system by means of the integrated exhaust gas flow. A sealing structure is provided between the AGR cooler 2 and the flange surface.

In fig. 2 a side view of the AGR cooler 2 according to fig. 1 mounted in the crankcase 1 can be seen. The AGR cooler 2 has a cooler box (kuhlerkassette) 3 functioning as a cooling path. A guide plate 4 is provided for supporting the cooling path of the cooler box 3. From the viewpoint of the flow direction of the exhaust gases, an inlet connection 5 and an outlet connection 8 are provided before and after the cooler box 3, respectively. The inlet connection 5 of the AGR-cooler 2 has a cast fin 6. The outlet connection 8 of the AGR-cooler 2 has a cast fin 6.

Fig. 3 shows a sectional view through the crankcase 1 of fig. 1 with the AGR cooler 2 in a cooling housing, the base body of which is an integral part of the crankcase 1 and which is covered by a cover which is screwed onto the crankcase 1. A guide plate 4 through which cooling water for the internal combustion engine flows is provided in a cooling path of the AGR cooler 2. On the inlet connection of the AGR cooler 2, a cast fin 6 around which the cooling water of the internal combustion engine flows can be seen. With respect to the cast fin 6 of the AGR cooler 2, a cast rib 7 arranged on the crankcase 1 of the combustion engine can be seen. The arrangement of the cast fins 6 with respect to the cast ribs 7 is such that in the mounted state in the region of the AGR-cooler 2 where the cooling water is guided, the clearance has an influence on the flow speed of the cooling water.

A cross-sectional view through the crankcase 1 along the line C-C of fig. 3 is shown in fig. 4. Here again it becomes clear how the arrangement of the cast fins 6 on the inlet connection 5 in combination with the cast ribs 7 provided on the crankcase 1 of the internal combustion engine influences the flow of cooling water.

List of reference numerals

1 crankcase

2 AGR cooler

3 cooler box

4 guide plate

5 inlet connection pipe

6 casting fin

7 casting ribs

8 outlet connecting pipe

9 Coolant inlet opening