AT500853B1

AT500853B1 - Internal combustion engine has several cylinders, crank case receiving crankshaft and a flywheel is arranged on crankshaft between two adjacent connecting rod offsets whereby flywheel is embodied in form of rotor of starter generator

Info

Publication number: AT500853B1
Application number: AT21062004A
Authority: AT
Inventors: Dieter Dipl Ing Hoefler; Gerd Kronsteiner
Original assignee: Avl List Gmbh; Akustikkompetenzzentrum Ges Fu
Priority date: 2004-12-16
Filing date: 2004-12-16
Publication date: 2006-04-15
Also published as: AT500853A4; AT500853B8

Abstract

The internal combustion engine has flywheel (23), which is embodied in the form of a rotor (24) of a starter generator (25). The internal combustion engine comprises of several cylinders, a crank case (1,18) receiving a crankshaft (19). At least one flywheel is arranged on crankshaft between two adjacent connecting rod offsets (22). An independent claim is also included for an oil pan for an internal combustion engine.

Description

2 AT 500 853 B12 AT 500 853 B1

Die Erfindung betrifft eine Ölwanne für eine Brennkraftmaschine, welche zumindest teilweise aus porösem Material gefertigt ist.The invention relates to an oil pan for an internal combustion engine, which is at least partially made of porous material.

Untersuchungen an Brennkraftmaschinen zeigen, dass die Ölwanne zu jenen Bereichen zählt, 5 die am meisten zur Geräuschabstrahlung beitragen.Investigations on internal combustion engines show that the oil pan is one of the areas that contribute the most to the noise emission.

Aus der US 5,452.693 und der US 5,531.196 A sind Ölwannen für Brennkraftmaschinen bekannt, welche zur Schalldämmung eine Sandwich-Struktur aufweisen. Dabei ist zwischen einer Innenschicht und einer Außenschicht eine Zwischenschicht aus einem Isolierschaum angeord-io net. Diese Zwischenschicht hat keinerlei tragende, sondern nur schallisolierende Funktion, weshalb weitere tragende Schichten erforderlich sind, was einen relativ hohen Herstellungsaufwand erfordert.US Pat. Nos. 5,452,693 and 5,531,196 A disclose oil pans for internal combustion engines which have a sandwich structure for soundproofing. In this case, between an inner layer and an outer layer an intermediate layer of an insulating foam angeord-net io. This intermediate layer has no supporting, but only sound-insulating function, which is why more supporting layers are required, which requires a relatively high production cost.

Aufgabe der Erfindung ist es, diese Nachteile zu vermeiden und auf möglichst einfache Weise 15 die Schallabstrahlung bei einer Ölwanne zu vermindern.The object of the invention is to avoid these disadvantages and to reduce the sound emission in an oil pan 15 in the simplest possible way.

Erfindungsgemäß wird dies dadurch erreicht, dass die Ölwanne eine selbsttragende Struktur aus Leichtmetallschaum, vorzugsweise aus Aluminium- oder Magnesiumschaum, aufweist. Der Leichtmetallschaum hat sowohl eine schalldämmende als auch eine tragende Funktion, so dass 20 auf einen zusätzlichen Tragkörper verzichtet werden kann. Durch die Konstruktion der Ölwanne aus Leichtmetallschaum kann die Schallemission deutlich reduziert werden.According to the invention this is achieved in that the oil pan has a self-supporting structure made of light metal foam, preferably of aluminum or magnesium foam. The light metal foam has both a sound-insulating and a supporting function, so that 20 can be dispensed with an additional support body. The construction of the oil sump made of light metal foam can significantly reduce the noise emission.

Um die Ölrückhaltung der Ölwanne zu ermöglichen, ist vorgesehen, dass die Innenseite der Ölwanne mit einer öldichtenden Beschichtung versehen ist. Alternativ kann dabei auch vorge-25 sehen sein, dass innerhalb der Ölwanne eine öldichte Innenwanne, vorzugsweise aus Kunststoff, angeordnet ist. Die Innenwanne aus Kunststoff stellt einen zusätzlichen Medienübergang dar und erhöht somit die Dämpfung. Besonders vorteilhaft ist es dabei, wenn die Innenwanne auch die Funktion einer Dichtung gegenüber dem anschließenden Kurbelgehäuse übernimmt. Der obere Rand der Innenwanne ist dabei als Dichtfläche ausgebildet. 30In order to enable oil retention of the oil sump, it is provided that the inside of the sump is provided with an oil-tight coating. Alternatively, it can also be seen that within the oil sump an oil-tight inner tub, preferably made of plastic, is arranged. The inner tub made of plastic represents an additional media transition and thus increases the damping. It is particularly advantageous if the inner tub also assumes the function of a seal against the subsequent crankcase. The upper edge of the inner tub is designed as a sealing surface. 30

Durch den Einsatz von Leichtmetallschaum kann bei geringem Gewicht eine erhebliche Reduktion der Schallemission erreicht werden.Through the use of light metal foam can be achieved with low weight, a significant reduction in the noise emission.

Durch die geringe Festigkeit des Leichtmetallschaums sind besondere Konstruktionen zur 35 Krafteinleitung erforderlich. Um eine sichere Befestigung der Ölwanne am Kurbelgehäuse über einen Flansch zu ermöglichen, ist vorgesehen, dass der Anschlussflansch eingeschäumte Auflagebleche und/oder Armierungen der Bohrung für die Befestigungsschrauben aufweist. Alternativ oder zusätzlich dazu kann vorgesehen sein, dass die Ölwanne zumindest einen Befestigungsflansch vorzugsweise aus Eisenwerkstoff aufweist, welcher über zumindest eine 40 Wurzelstruktur im anschließenden Leichtmetallschaumkörper eingebettet ist. Durch die Wurzelstruktur werden die Kräfte aus den Flanschflächen in die Schaumstruktur eingeleitet. Die Größe der von der Wurzelstruktur bedeckten Fläche hängt dabei zum einen von der übertragenen Kraft und zum anderen von der zulässigen Spannung im Schaummaterial ab. Um die Schallabstrahlung nicht zu erhöhen, sollten aber Körperschallbrücken durch die Wurzelstruktur vermie-45 den werden.Due to the low strength of the light metal foam special structures for 35 force application are required. In order to enable a secure attachment of the oil pan to the crankcase via a flange, it is provided that the connecting flange has foamed bearing plates and / or reinforcements of the bore for the fastening screws. Alternatively or additionally, it can be provided that the oil sump has at least one fastening flange, preferably of iron material, which is embedded over at least one root structure in the adjoining light metal foam body. Through the root structure, the forces are introduced from the flange into the foam structure. The size of the area covered by the root structure depends on the one hand on the transmitted force and on the other of the allowable stress in the foam material. In order not to increase the sound radiation, however, structure-borne sound bridges through the root structure should be avoided.

Die Erfindung wird im Folgenden anhand der Figuren näher erläutert.The invention will be explained in more detail below with reference to FIGS.

Es zeigen Fig. 1 eine erfindungsgemäße Ölwanne in einer Schrägansicht, Fig. 2 die Ölwanne in so einem Detailschnitt in einer ersten Ausführungsvariante, Fig. 3 die Ölwanne in einem Detailschnitt in einer zweiten Ausführungsvariante, Fig. 4 Armierungen für einen Flansch der Ölwanne und Fig. 5 einen Flansch mit Wurzelstruktur.1 shows an oil sump according to the invention in an oblique view, FIG. 2 shows the oil sump in such a detail section in a first embodiment, FIG. 3 shows the sump in a detail section in a second embodiment, FIG. 4 shows reinforcements for a flange of the sump and FIG 5 a flange with root structure.

Die Fig. 1 bis 3 zeigen eine Ölwanne 1 mit einer selbsttragenden Struktur 2 aus Leichtmetall-55 schäum, beispielsweise Aluminiumschaum. Durch die Leichtmetallschaumstruktur 2 wird dieFIGS. 1 to 3 show an oil sump 1 with a self-supporting structure 2 made of light metal foam, for example aluminum foam. Due to the light metal foam structure 2 is the

Claims

3 AT 500 853 B1 Sound emission of the oil sump 1 substantially reduced. In order to ensure oil tightness, an inner tub 3 made of plastic is arranged in the interior of the oil pan 1. The inner tub 3 may be loosely inserted into the structure 2. 5 The oil pan 1 has a flange 4 at its connection area to a not further illustrated crankcase. In order to enable a secure attachment to the crankcase, 4 foamed bearing surfaces 5 are provided in the region of the flange, as shown in Fig. 2. In addition to the bearing surfaces 5, reinforcements 6 can be inserted into the bores 4 a for the fastening screws 7. The reinforcements 6 can be made in one piece or separately with the support surfaces 5, as shown in detail in FIG. 4. In the example, the punched holes 5a of the two bearing surfaces 5 deep-drawn edges 5b. These are connected to each other by the sleeve-like reinforcement 6 of the bore 4a of the flange 4. For connection to the light metal foam, the reinforcements 6 have perforations 6a. The upper edge 8 of the inner tub 3 is pulled up over the flange surface 4 a of the flange 4 and can take over the function of a seal for the crankcase. As a result, separate seals can be omitted. As an alternative to the flange 4 shown in FIGS. 2 and 3, which consists of light metal foam, the flange 4 can consist of iron material and be embedded in the light metal body 2 via a root structure 9. Fig. 4 shows such a flange 4 of metallic material with a root structure 9. 25 Alternatively to the inner tub 3, the light metal body 2 may have on the inside an oil-tight coating. Through the oil pan 1 made of light metal foam, the sound radiation and the weight can be significantly reduced. Since the sump 1 consists of only one or two layers, the number of manufacturing steps can be reduced to a minimum. 35 1. Oil sump (1) for an internal combustion engine, which is at least partially made of porous mate rial, characterized in that the oil sump (1) has a self-supporting structure (2) made of light metal foam, preferably of aluminum or magnesium foam. Second oil sump (1) according to claim 1, characterized in that the inside (3) of the struc ture (2) has an oil-tight coating. 3. sump (1) according to claim 1 or 2, characterized in that within the structure (2) an oil-tight inner tub (3), preferably made of plastic, is arranged. 45 4. sump (1) according to claim 3, characterized in that the inner trough (3) assumes the function of a seal against a subsequent crankcase. 5. sump (1) according to one of claims 1 to 4, with a connecting flange (4) for loading 50 on a crankcase, characterized in that the connecting flange (4) foamed bearing surface (5) and / or reinforcements (6) having the bore for the fastening screws (7). 6. sump (1) according to one of claims 1 to 5, characterized in that the Ölwan- ne 55 (1) at least one mounting flange (4), preferably made of iron material, 4 AT 500 853 B1 which about root structures (9) in subsequent light metal foam body is embedded. 5 1 sheet of drawings 10 15 20 25 30 35 40 45 50 55