MXPA01007507A

MXPA01007507A - Method for mounting the oil pan on an engine block of an internal combustion engine, internal combustion engine in which the oil pan is fastened to the engine block according to said method, and flange connections produced according to the inventive meth

Info

Publication number: MXPA01007507A
Application number: MXPA/A/2001/007507A
Authority: MX
Inventors: Karlheinz Ritter; Thomas Martin Schmatz
Original assignee: Loctite Deutschland Gmbh
Priority date: 1999-01-25
Filing date: 2001-07-25
Publication date: 2002-03-26

Abstract

In order to mount the oil pan (10) on the engine block (30) of an internal combustion engine,a sealing element is produced between the engine block (30) and the oil pan (10) using a hardenable composition (20). When in a hardened state, the adhesion of the composition (20) is sufficiently large enough to hold the oil pan (10) to the engine block (30). The adhesion should equal at least 0.5 N/mm2, in particular, greater than 0.8 N/mm2. The hardenable composition (20) can be comprised of a silicon material. The oil pan (10) can be fixed to the engine block (30) at least during the hardening of the composition (20). To this end, the edge of the oil pan is constructively designed such that an independent fixation results when joining the oil pan (10) to the engine block (30).

Description

METHOD TO MOUNT THE OIL PICKER IN A BLOCK OF THE ENGINE OF AN INTERNAL COMBUSTION ENGINE, THE ENGINE OF INTERNAL COMBUSTION IN WHICH THE PICKUP IS SECURE OIL TO THE ENGINE BLOCK ACCORDING TO SUCH METHOD, AND THE OUTGOING CONNECTIONS PROVIDED ACCORDING TO THE INVENTIVE METHOD Description The invention relates to a process for joining the sump to a motor block of a combustion engine, a seal being drawn between a first sealing surface in the sump and a second sealing surface in the engine block, for which The curable composition is applied to one or both sealing surfaces. The invention further relates to a combustion engine with an engine block and a sump attached thereto, with a first sealing surface in the sump and a second sealing surface in the engine block and between which a composition is found. curable, and in general, outgoing connections with two protruding elements between which a seal with a curable composition is made. Such a process and such a combustion engine, res. , the outgoing connection is known from ABSTRACTS OF PATENTS OF JAPAN, Vol. 007, No. 275 (M-261) (= JP 581 52151 A), the current union of the sump being here in conventional way by means of threaded pins. A combustion engine is known from DE-A-41 03 685 with which the sump is connected to the engine block by means of an adherent agent which has permanent elasticity when cured. An adapter is provided as a stable preform between the engine block and the sump and the adapter has a vertical support that supports the adherent agent inside the engine. The structure of the sump, the adhering agent and the preform is after the adherent agent bonded to the engine block is cured in a conventional manner by means of screws and seals. EP-A-0 284 027 discloses an anaerobically vulcanized sealant composition, as well as its use in parts of hydraulically controlled mechanisms and combustion engines, such as the connection between a protrusion part to a sump and an engine block. , a connection between the cylinder head and the cylinder head cover and a connection in the gearbox. As in particular, the mention as a seal of the connection between the cylinder head and the cylinder head cover shows that the screws are used here additionally as fastening elements. A method of making polysiloxane seals is known from EP-A-0 409 079, making a seal on the projection of a motor vehicle with the sump being cited as an example of an application. The openings for the fastening pins are provided for the outlet of the drain in the respective drawing in such a way that the fastening pins are apparently used here, too, as connecting elements. In a known process of DE-U-298 1 2 978, the sump is also secured to the engine block in the conventional manner by the screws. In this term, the motor block must be provided with a number of threaded holes and a corresponding number of screws must be screwed as well. The object of the invention is to save these methods and components. This object is achieved according to the invention by adhesion of the curable composition when cured being sufficient to secure the sump to the engine block by the threaded pins not being used as fasteners. There is an addition to the process according to the invention that the sump is fixed to the engine block at least during the curing of the composition. It is shown that the adhesion of the curable or adhesive compositions is sufficient to secure a drain permanently and securely to an engine block. Preferably an adhesive with an adhesion of at least 0.5 N / mm2, especially of more than 0.8 N / mm2, is used. With the securing of the sump to the engine block according to the invention, the threaded holes in the motor block are unnecessary and there is no unscrewing of the secure screws. The sump can easily be pointed out of thin sheet steel. A machining, for example, grinding or surface grinding, of the sealing surfaces in the engine block and in the sump is not necessary as the curable composition can equalize the unevenness up to 0.5 mm or even 1 mm. The maximum allowable inequality is limited by the fact that, with large openings between the engine block and the sump, there is a risk that the curable composition will be turned off in the usual air leakage test by air displacement (test exhaust) on the engine finally installed. It takes about 30 minutes to install the motor, and the composition can not be cured sufficiently within this time to resist the overpressure of approximately 0.5 bar applied in the air leakage test with the thick layer thickness especially if the time of cure depends on the thickness of the layer as in the case of silicone adhesives that are cured by moisture. As there are no securing screws for the sump, there is a reduction in costs as a result of a reduction in the number of components, a reduction in the installation time and a simplification of the engine block construction due to the absence of the threaded holes. In addition, the cost advantages are given as a result of the fact that the sink can be a designated part. The curable composition can be any adhesive which is suitable for the materials and which possesses sufficient adhesion to the materials from which the engine block and the sump are made, i.e. metal, especially gray cast iron, aluminum-magnesium mixtures and -to the sink-plastic. Obviously, the composition must be sufficiently resistant to the medium used (oil, water / glycol, antifreeze). FI P products (formed in place) are particularly suitable. A curable composition is especially LOCTITE® RTV Silikon 5900 (RTV = room temperature vulcanization).

As such compositions have healing times of up to a few days, it is generally necessary to attach the sump to the engine block during this time by a self-fixing connection. Spring-lock connections and fasteners are suitable for this. The edge of the sump can, for example, break into a projection of the engine block, or individual grip handles that are clamped around the projection of the engine block can be provided on that edge. The edge of the sump can also be bent inward or curled around the projection on the engine block. As these fixing means are only necessary until the curable composition has healed, they can be removed afterwards if needed and used again. The sealing surfaces in the engine block and in the sump are preferably formed in such a way that there is an uneven layer thickness over the length of the sealing surfaces. To this term, the edge of one or both sealing surfaces may have a groove with an angle of, for example, 30 ° and a length of about 2 mm or be completed with a radius of about 4.5 mm, the opening formed by filling in partial or completely with the curable composition. The curable composition is applied in a known manner. The volume of the opening is to be larger than the amount of the curable composition applied in such a way that no curable composition is pressed off the edges. The maximum size of the opening is chosen such that the moisture or adhesion of the freshly applied composition is sufficient to retain the composition in the opening. The curable composition does not need to be applied or distributed over the entire length of the sealing surfaces. A free-opening application in the form of a flange is sufficient. With the corresponding protrusion geometry, the application can also, for example, be on the surface of the edge of the projection of the engine block, that is, on a surface that is situated parallel to the direction of the installation comprised of the sump and engine block. The process according to the invention is especially suitable for cases in which the sump does not need to contribute to the overall rigidity of the engine or other machine. The advantages of the invention have a particularly clear effect when a sump is attached to the engine block. However, the invention can be used, in principle when producing the outgoing connections with which the threaded pins to date, were used as connecting elements. The process according to the invention is also suitable in the same way, for example, for the union of valve covers and covers or covers to register cases or gear boxes. An example of embodiment of the invention is explained in greater detail in the following with reference to the drawing. They are shown in: Figure 1 in section, the edge of the sump and the opening of the sump of the engine block with a first embodiment of the fixing means; Figure 2 in section, the edge of the drain with other modalities of the fixing means.

Figure 1 shows a sump 1 0 that is fixed to a motor block 30 by means of a curable composition 20. The edge 20 of the sump 1 0 is clamped to produce a first substantially flat sealing surface 14 (fold 15). The engine block 30 has a sump opening 32 surrounded by a projection having a second substantially flat sealing surface 36. There is a layer 22 of the curable composition 20 between the two sealing surfaces 14, 36. The crease 15 of the edge 12 of the sump 10 has a radius of about 5.5 mm in such a way that the distance of the sealing surfaces 14, 36 from the interior of the sump 1 0 progressively decreases. The thickness of the layer 22 of the curable composition 20 located between the sealing surfaces 14, 36, therefore, it is not uniform but it is located in the largest part inside the sump 10 and is reduced outwards. Fastened against the outer edge of the sealing surface 14 of the sump 10 is a fixing edge 16 comprising the projection 34 of the engine block 30 to the extent that the sump is fixed to the engine block 30 during the other installation of the engine and the Motor vehicle. The fixing edge 16 breaks or closes around the projection 44 when the sump 1 0 is pressed against the projection 34. The latter during the acceleration of the motor vehicle, the fixing edge 16 simultaneously forms a safe against a sump separation 1 0 of the engine block 30 in the event of an accident or other sudden stress impact. Figure 2 shows the possibility to fix the sump 10 to the engine block 30. In a manner similar to that in Figure 1, a fixing edge 16 is provided but the spike-like tabs 18 resting against the upper side of the projection 34 are pressed out of the fixing edge 16. Figure 3 shows a fixing of the sump 10 to the engine block 30 in which the fixing edge 16 of the sump 10 is reformed after the application of the curable composition 20 and the attachment of the sump 10. and the engine block 30 in such a way that it comprises the projection 34. This reforming does not need to extend over the entire edge 16 of the sump 10. A pointed attachment at a distance of, for example, 20 cm is generally sufficient. Figure 4 shows an embodiment in which the edge 16 of the sump 10 forms an outwardly directed projection 38. After the application of the curable composition 20 and the attachment of the sump 10 and the engine block 30, the fasteners 40 come together which keep the sump 1 0 against the projection 34 of the engine block 30 during the curing of the composition 20. Example To join together a designated sump 10 of thin steel plate and a block of the molten steel motor 30, the surfaces of sealed 14, 36 are cleaned of loose soiled particles and dried. The sealing surfaces 14, 36 have a coating length of approximately 9 mm, and a ridge of approximately 3 mm in diameter of the curable composition 20 - corresponding to approximately 10 g / m - is applied to one or both surfaces of sealed 14, 36. LOCTITE® RTV-Silikon 5900 is used as the curable composition 20. The sump 10 moves upwardly in the projection 34 of the engine block 30 in such a way that the fixing edge 16 breaks around the projection 34 The flange of the curable composition 20 is pressed out to give a layer 22 of approximately 0.5 mm in thickness and a part of the composition 20 is pressed inwardly into the crease 15 of the edge 1 2 where the composition 20 forms a meniscus. between the sump 10 and the projection 34 of the engine block 30. Due to the high viscosity of the curable composition 20, the meniscus 24 is convex.

List of Reference Numbers 1 0 sump 12 edge 14 sealing surface 1 5 fold 16 fixing edge 18 tabs 20 composition 22 layer 24 meniscus 30 engine block 32 sump opening 34 projection 36 sealing surface 38 projection 40 fastener

Claims

CLAIMS 1. Process for joining the sump (10) to a motor block (30) of a combustion engine, a seal being made by means of a curable composition (20) between a first sealing surface (14) in the sump (10) and a second sealing surface (36) in the engine block (30), for which the curable composition is applied to one or both sealing surfaces, characterized in that a curable composition (20) is used whose adhesion when cured is sufficient to secure the sump (10) to the engine block (30), the threaded pins were not used as fasteners and the sump (10) is fixed to the engine block (30) at least during the curing of the composition (20). ). Process according to claim 1, characterized in that a curable composition (20) with an adhesion of at least 0.5 N / mm2, especially of more than 0.8 N / mm2, is used. Process according to claims 1 or 2, characterized in that the curable composition (20) is a silicone composition. Process according to any of claims 1 to 3, characterized in that a sump (10) indicated by thin sheet steel or made of plastics material and a motor block of cast aluminum or gray cast iron (30), are used. Process according to any of claims 1 to 4, characterized in that the edge of the sump is designed in such a way that a self-fixing takes place when the sump (10) is joined to the engine block (30). Process according to claim 5, characterized in that the sump (10) has a fixing edge (16) and the engine block (30) has a projection (34) and in which the fixing of the sump (10) takes place when it breaks the fixing edge (16) on the projection (34). Process according to any of claims 1 to 4, characterized in that the spike-like tongues (18) resting against a projection (34) on the engine block (30) are formed at the edge (12) of the sump (10). ). Process according to any of claims 1 to 4, characterized in that the edge of the sump is designed in such a way that the sump (10) is clamped to the engine block (30) by a reforming process that takes place after the joint . Process according to any of claims 1 to 4, characterized in that after the sump (10) has been attached to the engine block (30), the fastening clips (40) are joined in order to fix the sump (10). ) to the engine block (30). 1. Process according to any of claims 1 to 9, characterized in that the sealing surfaces (14, 36) are formed in such a way that the sealing opening formed between them increases in size inwards. eleven . Combustion engine having an engine block (30) and a sump (1 0) joined thereto, characterized in that - the sump (10) is attached to the engine block (30) with a curable composition (20) whose adhesion when it is cured it is sufficient to secure the sump (10) to the engine block (30) and in that the threaded pins do not present themselves as fasteners. 12. Combustion engine according to claim 1, characterized in that the composition (20) when cured has an adhesion of at least 0.5 N / mm2, especially of more than 0.8 N / mm2. The combustion engine according to any of claims 1 to 12, characterized in that the curable composition (20) is a silicone composition. 14. Combustion engine according to any of claims 1 to 13, characterized in that the sump (10) is indicated by thin sheet steel or made of plastics material and the engine block (30) consists of cast aluminum or cast iron of gray. The combustion engine according to any of claims 1 to 14, characterized in that the edge of the sump is designed in such a way that a self-locking takes place when the sump (10) joins the engine block (30) . 16. Combustion engine according to claim 1 5, characterized in that the sump (10) has a fixing edge (16) and the engine block (30) has a projection (34) and in that the sump attachment (10) takes place when the fixing edge (16) breaks. on the ledge (34). The combustion engine according to claim 15, characterized in that the spike-like tabs (18) resting against a projection (34) on the engine block (30) are formed at the edge (12) of the sump (10). The combustion engine according to claim 15, characterized in that the sump (10) and the sealing surfaces (14, 36) of the engine block (30) are formed, which are formed in such a way that the sealing opening formed between them it increases in size inward. 19. The protruding connection with two projecting elements between which a seal is made with a curable composition, characterized in that the threaded pins are not used as connecting elements.