Cam ring bearing for fuel delivery system

Details Cam ring bearing for fuel delivery system Cam ring bearing for fuel delivery system

F - Mech Eng,Light,Heat,Weapons

03

C

F03C 2/00 (2006.01) F04C 2/348 (2006.01)

Patent

CA 2493686

A bearing assembly is provided for a fuel delivery system that includes a pump (10) having a housing that rotatably receives a rotor (20) carrying vanes (26) thereon, a cam ring (70) received between the housing and rotor (20), and a support member of yoke (50) encompassing the cam ring (70) to selectively vary fuel flow. The bearing assembly (80) is a journal bearing between the yoke (50) and the cam ring (70) and includes an annular surface having a central opening therethrough. The annular surface includes a first, high pressure pad (102) and a second, low pressure pad (104) substantially diametrically opposite the first pad and separated by first and second lands (106, 108). The circumferential extent of the first pad (102) is at least as great as an inner diameter of the cam ring (70). Circumferential ends of the second pad (104) are wider than circumferential ends of the first pad. The first and second pads (102, 104) are formed by circumferentially extending grooves that extend an entire width of the bearing so that the cam ring moves between the first and second pads, and thereby varies a clearance between the lands (106, 108) and the cam ring (70).

L'invention concerne un ensemble palier conçu pour un système d'alimentation en combustible qui comporte une pompe (10) équipée d'un boîtier où est logé un rotor (20) qui porte des aubes (26), une couronne à cames (70) logée entre le boîtier et le rotor (20), et un élément de support de culasse (50) enveloppant la couronne à cames (70) de façon à faire varier sélectivement le débit de combustible. L'ensemble palier (80) est un palier lisse entre la culasse (50) et la couronne à cames (70) et comporte une surface annulaire ayant une ouverture centrale traversante. Ladite surface annulaire comporte un premier coussinet (102) à pression élevée et un second coussinet (104) à faible pression qui sont sensiblement diamétralement opposés et séparés par une première et une seconde cloisons (106, 108). L'étendue circonférentielle du premier coussinet (102) est au moins aussi grande qu'un diamètre interne de la couronne à cames (70). Les extrémités circonférentielles du second coussinet (104) sont plus larges que celles du premier coussinet. Les premier et second coussinets (102, 104) sont formés par prolongement circonférentiel de cannelures qui étendent toute une largeur du palier, la couronne à cames se déplaçant alors entre le premier et le second coussinets, ce qui fait varier un dégagement entre les cloisons (106, 108) et ladite couronne à cames (70).

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