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Self-Retaining Seal having a Resilient Lip Element

IP.com Disclosure Number: IPCOM000033199D
Publication Date: 2004-Dec-01
Document File: 5 page(s) / 90K

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The IP.com Prior Art Database


In order to ensure that a seal is secured into a groove of a component or part onto which the seal is mounted the seal profile is provided with a resilient lip . This lip creates friction forces against the sides of a groove so as to retain the seal therein. This design allows unintentional interruptions in the lip without risking the friction-based retention of the seal in the groove. Also various imperfections in the groove are acceptable, since the resilient lip will adapt thereto. Moreover, the seal is relatively insensitive to variations in the overall width of the groove. The seal may be used in an internal combustion engine as a seal between an oil pan and an engine block.

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Self-Retaining Seal having a Resilient Lip Element

In order to ensure that a seal is secured into a groove of a com­ponent or part onto which the seal is mounted, it is common practice to equip the seal with projections or stubs that are adapted to be fitted into receiving notches or holes in, or adja­cent to, the groove. Thereby, the seal will be held in place also when no exter­nal pressure is applied against the seal, so that for example the component can be held upside down without risking that the seal falls out. Naturally, this is very desirable, particularly during assembly and service.

However, this design requires a perfect match between the seal and the component onto which it is to mounted. Namely, other­wise the projections/stubs will not fit into the notches/holes. The dimen­sions of the groove also need to correspond to the dimen­sions of the seal. I.e. the seal can neither be wider, narrower, deeper or grounder than what is given by the geometry of the groove in order to attain the desired sealing function. Moreover, the design is sensitive to dirt particles in the groove, since such particles may affect the possibility to fit the projections/stubs into the notches/holes. Furthermore, minor damages on the seal, such as broken projections/stubs, may result an insecure or poor fitting of the seal in the groove. Insignificant damages on the groove, e.g. jags, may also cause similar problems.

In order to solve these problems, it is proposed that the seal profile be provided with a resilient lip element. Figure 1a shows a cross-section view of a schematic seal including as an integral part a resilient seal body 110 and a resilient lip element 120. Primarily, the sealing func­tion is accomplished by means of the seal body 110, whose spe­cific shape is determined by the component or part into which the seal is to be mounted. Thus, the general contour of the seal is normally not round. Instead, it may have a rectan­gular outline, or any other regular or irregular shape given by the application.

The purpose of the resilient lip element 120 is to create friction forces against the sides of a groove 135 in a first part 130 into which the seal is fitted. See figure 1b, which illustrates a situa­tion during an assembly procedure when the seal has been fitted into the first part 130, however the part against which a sealing is to be realized has not yet been assembled. Preferably, the re­silient lip element 120 extends along the entire perimeter of the body 110. How­ever, one or more interruptions in the element 120 may be provided without significantly weakening friction bet­ween the seal and the groove 135. Such interruptions may even be desirable, for example in con­nec­tion with sharp bends in the seal outline, so as to facilitate the mounting of the seal.

Moreover, also unintentional interruptions in the resilient ele­ment 120 (i.e. due to damages) can be tolerated without risking the friction-based retention of the seal...