Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1998-10-15
1999-11-16
Wolfe, Willis R.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
123195C, F02F 700
Patent
active
059838523
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a static seal for combustion engines, in particular covers for crankshaft and gear housing, consisting of a basic body made from metal, etc. and provided with holes for holding attachment screws, as well as sealing strips of an elastomer material attached on it by means of, e.g. vulcanization, etc., whereby these sealing strips are provided with at least one axially projecting link.
BACKGROUND OF THE INVENTION
Such seals are used for the releasable, fluid-tight attachment of housings, such as oil pans or valve covers, on the engine block, or for covers of crankshaft and gear housings. When sealing a crankshaft housing, the housing cover consists of a dynamic seal for the crankshaft extending through the cover, whereby the dynamic seal consists of at least one, possibly spring-loaded, elastic sealing lip that has been attached by vulcanization, as well as two flange surfaces that meet each other at an angle of usually 90 degrees and that must be statically sealed, and of which one extends radially to the crankshaft housing and is used for the tight connection with the crankshaft housing, and the other extends in the crankshaft axial direction and is provided for the tight connection with the oil pan, whereby sealing strips that project from the flange surfaces are provided for the static sealing of both flange surfaces in the crankshaft axial direction or radially in relation to it.
DE-PS 36 34 735 introduces a housing cover consisting of a sheet metal body drawn in bowl shape which, for the purpose of sealing the crankshaft, is provided with a dynamically loaded sealing ring of an elastomer material, as well as statically acting sealing strips, also made from an elastomer material, which merge with each other to form one piece. A sealing strip exiting from the axial flange surface is used for sealing the oil pan which can be screwed in from the bottom against the crankshaft housing. Two nuts are welded into the housing cover so that during the unscrewing of the oil pan the sealing strip between the housing cover and the oil pan can be pressed together with an adequate superficial pressure in order to create the seal.
A flawless seal requires that the surfaces of the housing surfaces opposite from the sealing strip are highly accurate, which has a great effect on manufacturing and processing costs. Special requirements for a perfect seal are hereby posed not only by the macro-irregularities of the surfaces, but also by micro-roughnesses, pores, step transitions, etc. In addition, heat fissures and furrows may occur over time on the sealing strips during operation, which may result in a long-term deterioration of the sealing effect.
SUMMARY OF THE INVENTION
The invention is based on the objective of improving a seal according to the claims in such a way that on the one hand the finishing costs for the countersurfaces can be significantly reduced, or no finishing is necessary at all, and on the other hand the sealing effect is even further improved and is ensured even over the long term.
According to the invention this objective is realized in that sealing strips are provided on the end face opposite from the flange surface of the housing with recesses into which a sealant has been placed.
This sealant is distributed during the attachment of the cover, etc. both across the sealing strip, protecting its surface, and on the other hand, across the rough or uneven surface of the flange surface of the housing, penetrating into the uneven places, pores, or recesses of the flange surface, thus filling them.
In order to improve this distribution of the sealant, a further characteristic of the invention suggests that the sealing strips on the end face is provided with a profile that brings about a transport of the sealant to certain surfaces. According to another characteristic of the invention, it is preferably suggested that the sealing strips, in order to form the recesses, are designed on the end face with a saw tooth-like profile with at least one angled side
REFERENCES:
patent: 4050700 (1977-09-01), Lifferth
patent: 4265495 (1981-05-01), Backlin
patent: 4508072 (1985-04-01), Takami et al.
patent: 4688752 (1987-08-01), Barteck et al.
patent: 4799691 (1989-01-01), Stritzke et al.
patent: 4846482 (1989-07-01), Blodgett et al.
patent: 4928980 (1990-05-01), Deuring
patent: 5152538 (1992-10-01), Mims
patent: 5329898 (1994-07-01), Nelson et al.
Olbricht Helmut
Weitz Klaus-Peter
Benton Jason
CR Elastomoere GmbH
Ford-Werke Aktiengesellschaft
Wolfe Willis R.
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