Gastight, undetachable connection of two metal parts

{
  "publication_number": "US4505238A",
  "country": "US",
  "kind": "A",
  "title": "Gastight, undetachable connection of two metal parts",
  "abstract": "A positive, gastight, and undetachable connection of two metal parts, especially a cylinder head and a cylinder tube of an internal combustion engine. A groove is located in one of the two parts; this groove, together with a counterpiece of the second part, which counterpiece engages in the groove, forms an annular chamber which is filled with molten metal according to the diecast method, and in such a way as to be free of occlusions.",
  "claims": [
    "1. A positive, gastight, undetachable die cast connection of two metal parts which form a unit with a seal tightness therebetween to reduce initial prestressing and deformation during subsequent treatment, comprising a bulb-shaped groove in one of said two parts, and a bulb-shaped counterpiece associated with the other of said two parts, said groove having a base which is wider than its opening and said groove having inclined sidewalls which are further apart at the base of said groove than at the opening thereof, with the base of said groove being circular, said counterpiece having a head which is wider than its base and said counterpiece having inclined sidewalls which are further apart adjacent the head of said counterpiece than at the base thereof with an annular depression surface joining together its head and sidewalls, with the head of said counterpiece being circular, said counterpiece being inserted in said groove in such a way as to form an annular chamber therebetween, said annular chamber being filled with pouring of molten metal under pressure, said inclined sidewalls and circular head of said counterpiece assuring an occlusion-free pouring since sharp corners and edges are avoided on which dirt and gas bubbles can settle while eliminating cracks or fissures caused by sharp corners and edges, which occur under great mechanical and thermal loads acting thereon, at least one of the sidewalls of at least one of said groove and said counterpiece being provided with grooving.",
    "2. A connection according to claim 1, in which said molten metal under pressure is introduced into said annular chamber.",
    "3. A connection according to claim 1, in which said two metal parts being a cylinder head and a cylinder tube respectively, with said groove being provided in said cylinder head, and said counterpiece being integral with said cylinder tube.",
    "4. A connection according to claim 3, in which said molten metal under pressure is introduced into said annular chamber."
  ],
  "description_excerpt": "The present invention relates to a positive, gastight, undetachable connection of two metal parts, especially a cylinder head and a cylinder tube of an internal combustion engine.\n\nThe previously known connections of two metal parts, for instance by welding, adhesion, or screwing, can only be used to a limited extent, or with considerable difficulty, if the parts are made of different materials, for instance cylinder heads and cylinder tubes of internal combustion engines, where the cylinder heads are made of an aluminum cast alloy, and the cylinder tubes are made of a cast-iron alloy. Since the cylinder heads, because of their high heating and their material characteristics, expand much more than the cylinder tubes, satisfactory results cannot be obtained with the previous conventional types of connections.\n\nThe conventional types of connection also do not lead to satisfactory results even when identical materials are used with the selected example of the cylinder head-cylinder tube. For example, sealing problems arise with screw connections, and in addition, the nearly point-type or concentrated force introduction or application leads to inhomogeneous stress distribution in the structural parts. Welding methods are precluded for the conventional materials of cylinder heads and cylinder tubes, and the adhesive techniques are not applicable at all, or only to a limited extent, since the required thermal stability cannot be attained.",
  "cpc": [
    "B22D 19/0009",
    "F02F 1/04",
    "Y10T 29/4927"
  ],
  "ipc": [
    "B22D 19/00",
    "F02F 1/04",
    "F16B 7/20",
    "F16J 13/00"
  ],
  "assignees": [
    "Kloeckner Humboldt Deutz AG"
  ],
  "inventors": [
    "Friedrich Jordan"
  ],
  "filing_date": "1984-06-18",
  "publication_date": "1985-03-19",
  "grant_date": "1985-03-19",
  "priority_date": "1980-12-12",
  "application_number": "US-62142984-A",
  "family_id": "6118946",
  "cited_by_count": 14,
  "citations": [
    "US1360909A",
    "DE361000C",
    "US3166053A",
    "DE2747839A1",
    "DE2911628A1"
  ]
}