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Seal for combustion engine

IP.com Disclosure Number: IPCOM000208224D
Publication Date: 2011-Jun-27
Document File: 4 page(s) / 79K

Publishing Venue

The IP.com Prior Art Database

Abstract

A seals for use between two connected flanges comprise a metallic base plate which on both sides is covered with a sealing material being compressed between the flanges. This invention will enable that the material is compressed better and will enable a leak proof seal. This is done by limiting the area of the base plate that is covered by the material. Thereby the force exerted by fastening screws will be distributed to a smaller area of the material and the surface pressure will be correspondingly higher. On the base plate only the area around the hole to be sealed is covered with the material while the areas around the holes for the screws not are covered. To position the sealing material in relation to the hole to be sealed the base plate is formed with folded tabs holding the sealing material in correct position.

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Page 01 of 4

Seal for combustion engine

Seals for use between two connected flanges usually comprise a base plate of a metallic material which on both sides is covered with a more or less elastic material. One example of such a seal is a seal arranged between two flanges connecting two parts in the exhaust system of a combustion engine. These flanges are usually fastened by screws. Since the whole base plate is covered with the elastic material, also around the holes for the screws in the flanges, quite a large area of the elastic material must compressed by the screws. This means that the screws must be dimensioned for such high forces or otherwise the elastic material will not be compressed enough to enable a leak proof seal.

This invention will enable that the elastic material is compressed better and will enable a leak proof seal between the fastening flanges. This is done by limiting the area of the base plate that is covered with the elastic material. Thereby the force exerted by the fastening screws will be distributed to a smaller area of the elastic material and the surface pressure will be correspondingly higher.

Preferable only the area around the hole to be sealed is covered with the elastic material while the holes for the screws not are covered.

Enclosed drawings show an example of an inventive seal. The seal comprise a base plate 1 made of a metallic material having attached on both sides rings 2 made of graphite or other deformable or elastic material. The seal is intended do be attached between two flanges being parts of components in the exhaust system of an internal combustion engine.

The seal has a larger hole 3 through which exhaust gases is intended to be led, and has two smaller holes 4, 5 intended for screws attaching the two flanges together. The rings 2 are attached to the base plate by tabs 6 being part of the base plate 1. As can be seen in the drawings four tabs 6 are folded upwards and four tabs 6 are being folded downward, to hold the respective rings 2 in place on each side of the base plate 1. These tabs also hold the rings in correct position with regard to the larger hole 3.

The thickness of the base plate 1 can be quite small compared to the thickness of the rings 2.


Page 02 of 4

However the thickness of the base plate 1 must be enough to form a solid unit and to hold the rings 2 in place. The thickness of the rings 2 must be enough to compensate for the surfaces to...