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).