An extension-retraction link includes: a stationary shaft having a tubular shape; a first universal joint that connects the stationary shaft to a vehicle body side member; a movable shaft that can slide with respect to the stationary shaft; a second universal joint that connects the movable shaft to a hub carrier; and an actuator that moves the movable shaft. The movable shaft includes: a first plane surface; a second plane surface making an angle with respect to the first plane surface; a third plane surface opposite the first plane surface; and a fourth plane surface opposite the second plane surface. The stationary shaft includes: first to fourth bushes in contact with the first to fourth plane surfaces, respectively; a first elastic member pressing the third bush to the third plane surface; and a second elastic member pressing the fourth bush to the fourth plane surface.

An assembly comprising: a core in the form of a toroid; and at least one washer overlying the core, the washer comprising a polymer, wherein the washer has an arcuate cross-section so as to have a shape complementary to the core.

A method of manufacturing a bottom bearing may include forming a first half-cylinder and a second half-cylinder, the first half-cylinder including a first shoulder and a first inside surface and the second half-cylinder including a second shoulder and a second inside surface. The first shoulder and second shoulder are configured to bear the weight of a vertical shaft by exerting an upward force on a sleeve in mechanical communication with the vertical shaft.

A ball joint includes a stud extending from a ball. A housing has a bore that receives the ball. The housing has an interior surface facing the ball that includes a groove. A plastic bearing is arranged between the ball and the housing. The plastic bearing has first and second sides opposite one another. The first side has a spherical surface engaging the ball. The second side has a protrusion opposite the spherical surface that is received in and fills the groove and a recess in the spherical surface opposite the protrusion.

An object of the present invention is to provide an ester-based lubricating base oil for a fluid bearing that has excellent hydrolysis resistance and low-temperature fluidity, a high viscosity index, and good evaporation resistance. The present invention relates to a lubricating base oil for a fluid bearing comprising a compound represented by general formula (1):

##STR00001##

wherein R.sup.1 represents a linear C.sub.7-C.sub.13 alkyl group, and a compound represented by general formula (2):

##STR00002##

wherein R.sup.2 represents a linear C.sub.7-C.sub.13 alkyl group; and relates to a base oil composition comprising the base oil.

A nested bushing arrangement may comprise a first nested bushing coupled to a second nested bushing. Each nested bushing may comprise a mating aperture located opposite an annulus body. The annulus body of each nested bushing may insert within the mating aperture of the opposite nested bushing to couple the first nested bushing to the second nested bushing.

An axle support assembly is provided for an electrical device, and which comprises an axle support defining an axle receiver having a cylindrical or substantially cylindrical side wall and an internal base portion. There is also an axle having an end which is dimensioned to be press-fit into the axle receiver. At least one venting channel extends between the internal base portion of the axle receiver and an exterior of the axle support when the axle is press fit into the axle receiver.

A universal joint includes: a housing; an arm, part of which is located inside the housing; an external bush that is located between an inner circumferential surface of the housing and the arm; an internal bush that is located on the opposite side of the external bush with the arm being interposed therebetween; and a supporting member that supports the internal bush. The arm includes: an arm convex surface that is a spherical convex surface; and an arm concave surface that is a spherical concave surface. The external bush includes a bush concave surface that is a spherical concave surface in contact with the arm convex surface. The internal bush includes a bush convex surface that is a spherical convex surface in contact with the arm concave surface.

A bearing bush includes a core, an intermediate sleeve surrounding the core in a manner extending in a circumferential direction, an outer sleeve surrounding the intermediate sleeve in a manner extending in the circumferential direction, an elastomer body disposed between the intermediate sleeve and the outer sleeve, and a stop device. In embodiments, at axial ends of the core, the stop device protrudes from the core in a radial direction and limits a movement of the intermediate sleeve in an axial direction. The intermediate sleeve is mounted on the core and, relative to the stop device, in a circumferentially rotatable manner. The outer sleeve has several projections. The intermediate sleeve has at least one counter-projection which overlaps in the radial direction with the projections for limiting the axial deflection of the outer sleeve relative to the core.

Grease composition contains (A) a straight-chain perfluoropolyether having a kinematic viscosity of 2-110 mm.sup.2/s at 40 C., (B) a branched perfluoropolyether having a kinematic viscosity of 2-100 mm.sup.2/s at 40 C., and (C) a fluorocarbon resin powder having a primary particle size of 1 m or less, wherein the contained amount of the fluorocarbon resin powder is 25-40 wt % with respect to the weight of the grease composition, and the weight ratio of the straight-chain perfluoropolyether (A) to the branched perfluoropolyether (B) is 15:85 to 70:30.