Automatic valve clearance adjuster

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

Patent

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Details

F01L 1/22 (2006.01) F01L 1/24 (2006.01)

Patent

CA 2399059

An automatic valve clearance adjuster comprising an internally screw-threaded housing (1); an externally screw-threaded screw member (3) extending within the housing; the screw thread (4) of the screw member (3) having an external form which is complementary to the thread form of the internal thread (2) of the housing and fits therein with a predetermined axial clearance, the thread being trapezoidal in form, symmetrical in axial cross-section and exhibiting equal frictional resistance against movement in both axial directions; wherein the flank angles, helix angle and number of starts of the screw thread are selected to ensure that the screw member will rotate and advance axially out of the housing solely under the influence of an axial force on its end within the housing; and the emerging end (7) of the screw member is adapted to work in conjunction with an adjacent component to receive therefrom a frictional resistance to rotation.

L'invention concerne un dispositif de réglage de jeu de soupape automatique, comprenant un logement femelle fileté (1) et une vis mâle filetée (3) s'étendant dans le logement. Le filetage (4) de la vis (3) est complémentaire au filetage interne (2) du logement et s'ajuste à l'intérieur du logement avec un jeu axial prédéterminé. Le filetage possède une forme trapézoïdale, symétrique en section transversale axiale et présentant une résistance de frottement de même force contre le mouvement dans les deux directions axiales. Les angles de pression, l'angle d'hélice et le nombre d'entrées de filet sont sélectionnés de manière à assurer que la vis puisse tourner et sortir axialement du logement sous l'effet unique d'une force axiale appliquée sur son extrémité, dans le logement. L'extrémité émergente (7) de la vis est conçue pour coopérer avec un élément adjacent exerçant une force de résistance de frottement de sens opposé à la force de rotation de la vis.

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