Valve stem seal assembly with valve guide retainer

F - Mech Eng,Light,Heat,Weapons – 01 – L

Patent

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Details

F01L 3/08 (2006.01)

Patent

CA 2457867

A valve stem seal assembly (10) for an internal combustion engine includes an elastomer seal body (14) and a metal retainer (36) adapted to secure the seal body in place over a valve guide (12). The cylindrical seal body (14) has an aperture with at least one radially inwardly directed sealing lip (16) adapted to engage a reciprocally movable valve stem to minimize escape of oil lubricant from the engine along a path between the valve guide and stem. The retainer (36), formed of a spring metal cylindrical body adapted to frictionally retain the seal body (14) at its upper end, contains first and second sets (42, 44) of axially depending resilient fingers at its lower end. The first set (42) of fingers mechanically engages and supports a unique valve guide member (12) within a valve guide aperture (48) of a cylinder head deck (46), while the second set of fingers supports the seal assembly directly against the head deck under a valve spring.

L'invention concerne un assemblage de joint de tige de soupape (10), destiné à un moteur à combustion interne, comprenant un corps de joint en élastomère (14) et un arrêtoir métallique (36) conçu afin de fixer le corps du joint en place sur un guide de soupape (12). Le corps de joint cylindrique (14) comporte une ouverture avec au moins une lèvre de joint dirigée radialement vers l'intérieur (16) conçue afin d'engager un tige de soupape à déplacement alternatif dans le but de minimiser la perte d'huile lubrifiante provenant du moteur le long d'un chemin passant entre le guide et la tige de soupape. L'arrêtoir (36), formé d'un corps cylindrique métallique à ressort conçu pour retenir, par friction, le corps de joint (14) à son extrémité supérieure, contient des premier et second ensembles (42, 44) de doigts résilients, à dépendance axiale, à son extrémité inférieure. Le premier ensemble (42) de doigts engage mécaniquement et supporte un élément unique (12) du guide de soupape à l'intérieur d'une ouverture (48) du guide de soupape en tête de culasse (46), alors que le second ensemble de doigts supporte l'assemblage de joint directement contre la tête de culasse sous un ressort de soupape.

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