DE1052745B - Seal for engine parts - Google Patents

Description

GERMAN

The invention relates to a seal for engine parts made of different materials, are in connection with a common cooling water room and against each other by clamping means are pressed.

In such engine parts, e.g. B. a wet cylinder liner made of cast iron and a cylinder block made of an aluminum alloy, arises at the contact surface or at the contact points of iron, Aluminum and water increased corrosion by causing an electric current from one metal to another over which an electrolyte-forming cooling water flows. This is usually always between different metals because of the known voltage series of metals. Because water impurities or contains salts, it forms an electrochemical one together with aluminum (+) and iron (-) Element. Especially with poor surface pressure between the liner and cylinder block the light metal becomes so strong and mainly due to the electrolyte in the course of time common points of contact removed so that no sealing of the cooling water spaces guaranteed and the cylinder block becomes unusable in a relatively short time.

The invention is based on the knowledge that the electrolytic current to reduce corrosion must be forced on a path that offers maximum resistance and thus the resulting only small currents reduce the corrosion or avoid it at all. The degradation This currents is also important because the resistance of the electrolyte increases with engine and motor The water temperature drops and the current strength is therefore also in the immediate area of the material electrodes can be relatively high.

It is generally known to use elastic seals in the form of a round or profile rubber, by z. B. the one part to be sealed is provided with a groove into which the rubber profile is inserted will. The opposite can have an increased sealing surface in relation to the sealing strip. It is also at Motor vehicle engines known, between the cylinder head and cylinder block or the cylinder liners apply elastic seals. However, these only serve to prevent the cooling water from escaping and are in no way related to the object of the invention.

According to the invention, surprisingly, a corrosion-resistant seal for various Existing materials, connected to a cooling water space and by clamping means Motor parts pressed against one another are proposed which are made up of a sealing ring known per se Seal for engine parts

Applicant:

Ford-Werke Aktiengesellschaft,
Cologne-Niehl, Henry-Ford-Strasse

Dipl.-Ing. Waldemar Werner, Cologne-Klettenberg,
has been named as the inventor

Rubber od. The like. Is marked, which is pretensioned at the common point of contact of the cooling water space and the cast and light metal part corners

ao is in such a form-fitting manner that the access of the electrolytic coolant to this point of contact in the coolant is increased by more than ten times the original distance at the point.
Such an arrangement of a single sealing ring, known per se, greatly reduces the strength of the electrolytic current between the various materials acting as electrodes, in that a greater distance between the parts as well as a curved field line is created. The common point of contact of water and the various materials is covered by the form-fitting rubber seal and thus prevents water from reaching this point. At the same time, the rubber ring provides a secure seal for the parting line and thus prevents corrosion between the material parts there either.

The invention is illustrated schematically in the drawings.

Fig. 1 shows a detail of the cylinder head, cylinder block, liner and piston in a sectional view;

Fig. 2 is a single representation of the seal.
Fig. 1 shows a cylinder head 19, which is known via clamping means such. B. stud bolt, is firmly anchored to the cylinder block. The cylinder head 19 transmits a contact pressure to the cast-iron liner 10, the liner 10 being supported on the cylinder block 11. The piston is designated by 18.

Fig. 2 shows details of the seal according to the invention between the liner and the an aluminum alloy existing cylinder block 11. Both are with a common space 13 for water or coolant in this way in connection

809 769/288

tion that at point 16 the point of contact for both materials and the coolant (water) is formed will. A recess, e.g. B. circumferential groove 14 is for a sealing ring made of rubber or other elastic material that is resistant to the effects of cooling water. The rubber ring is inserted into the groove 14 between corner point 16 and web 15 in such a way that between block 11 and web 15 the sleeve 10 creates an absolutely effective seal and the water neither into the groove nor from here can also get to point 16. The corner 17 on the block 11 can expediently be beveled. the Sealing also effectively prevents any ingress of water to the parting line 20. It can thus be seen that the effective resistance of the electrolyte because of lengthening the current path and weakening the electric field increases sharply.

10

Claims (1)

Claim: Corrosion-proof seal for ao made of different materials, with a common Engine parts connected to the cooling water space, which are clamped against each other by clamping means are pressed, z. B. cast cylinder liner and cylinder block made of an aluminum alloy, marked by a known sealing ring (12) made of rubber or the like, which is pretensioned at the common abutment point (16) of the cooling water space (13) and the cast and light metal part corners is in such a form-fitting manner that that the access of the electrolytic coolant to this abutment point (16) is prevented and the distance between these engine parts (10, 11) in the coolant by more than ten times the original distance at point (16) is increased. Considered publications:
U.S. Patent No. 1,860,769; Trutnovsky, "Seals", Springer-Verlag
1949, p. 15. 1 sheet of drawings © 809 769/288 3.59