Hydraulic valve tappet

Details Hydraulic valve tappet Hydraulic valve tappet

F - Mech Eng,Light,Heat,Weapons

01

L

F01L 1/24 (2006.01) F01L 1/25 (2006.01)

Patent

CA 2089100

A hydraulic tappet for the valve drive of an internal combustion engine includes an inner piston and outer cylindrical element which are movable relative to one another in the axial direction. The outer element consists of an essentially cup shaped housing having a flat face and the inner piston and the outer element together define an outwardly sealed, oil-filled storage space of variable volume. A compressible displacement element to compensate for volume changes is positioned in the storage space. The outer element has a tubular sheath of thermoplastic synthetic material which has radially inner and outer sliding surfaces. The sheath is closed liquid tight in direction of an associated cam shaft and cam by a disk which is received against the cam. The inner sliding surface closely and without liquid leakage surrounds the inner piston along its outer circumference. The tappet can be economically manufactured, the assembly sequence is improved, it consists of only a few parts and has excellent operating characteristics over an extended service life.

Poussoir hydraulique servant à l'actionnement de soupapes de moteurs à combustion interne, constitué d'un piston interne et d'un élément cylindrique externe, à déplacement réciproque dans le sens axial. L'élément externe est essentiellement un logement en forme de godet comportant une face plane et, avec le piston, il constitue un espace scellé, rempli d'huile, de volume variable, dans lequel est monté un élément compressible servant à compenser les variations de volume. L'élément externe comporte une gaine tubulaire en matériau synthétique thermoplastique à surfaces de glissement interne et externe. La gaine est fermée par un disque étanche contre lequel vient s'asseoir une came retenue par son arbre. La surface de glissement interne, étanche, entoure le piston sur toute sa circonférence. Le coût de fabrication du poussoir n'est pas très élevé, la séquence d'assemblage est perfectionnée, le dispositif ne comporte qu'un petit nombre de pièces et présente d'excellentes caractéristiques de fonctionnement sur une période prolongée.

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