NIPPON THOMPSON CO., LTD.

A rolling bearing includes outer and inner steel rings made of steel and rolling elements respectively rollable on inner and outer circumferential surfaces of the outer and inner rings. The outer ring includes first and second outer rings. The inner ring includes first and second inner rings. The first and second outer rings and the first and second inner rings include first, second, and third portions. The first portion is a disk annular portion orthogonally extending relative to the first axis direction. The second portion is connected to the first portion and has a circumferential surface constituting an annular rolling surface. The third portion is connected to the second portion and includes a tubular portion extending along the first axis direction. The first and second inner ring third portions have end surfaces spaced from and opposed to inner circumferential surfaces of the first and second outer ring third portions, respectively.

A radial thrust bearing includes radial rolling elements, a radial cage, thrust rolling elements, a thrust cage, an outer ring, and an inner ring. The outer ring has a through hole that reaches a raceway region of the radial rolling elements from outside. The radial cage includes a pair of annular portions disposed at an interval in an axial direction, and pillar portions coupled to the pair of annular portions and disposed at an interval in a circumferential direction to form pockets that house the radial rolling elements. Radially outer surfaces of the pillar portions include grooves each extending in the axial direction and recessed radially inward. Each of the grooves has an opening at least one axial end of a corresponding one of the pillar portions.

A rolling bearing includes a shell type outer ring having a raceway surface on an inside diameter side thereof, multiple rollers rolling on the raceway surface, and a retainer arranged on the inside diameter side of the shell type outer ring and retaining the multiple rollers. The shell type outer ring has a flange formed to extend on the inside diameter side. The shell type outer ring has a protrusion formed to protrude on the inside diameter side. A plurality of such protrusions are provided spaced apart from each other in a circumferential direction. When a protruding amount of the protrusion from the raceway surface is a length L 1 and a wall thickness of the shell type outer ring at the raceway surface is a length T 1 , the length L 1 is not more than the length T 1 .

A rocking table includes a base portion, a linear motion mechanism including a rail attached to the base portion and a slider relatively movably attached to the rail, a driving source causing the slider to perform a linear reciprocating motion, a first support portion attached to the slider and performing a linear reciprocating motion together with the slider, a first rolling bearing attached to the first support portion, a table portion capable of performing a rocking motion with power transmitted from the driving source, a second support portion supporting the table portion, a second rolling bearing attached to the second support portion, and an eccentric shaft including a first shaft portion and a second shaft portion arranged eccentrically with respect to the first shaft portion, the first shaft portion being supported by the first rolling bearing, the second shaft portion being supported by the second rolling bearing.

A bearing includes: a plurality of cylindrical rollers arranged in a circumferential direction; and a separator adjacent to the cylindrical rollers in the circumferential direction. The separator has a cylindrical shape. An outer peripheral surface of the separator has an annular groove defined by a groove wall surface, a shape of the groove wall surface in a cross section including a center axis being an arc shape. The separator is oriented such that the groove wall surface contacts outer peripheral surfaces of the cylindrical rollers adjacent to separator in the circumferential direction. The groove wall surface has a curvature radius larger than a curvature radius of the outer peripheral surface of each cylindrical roller.

A straight-curved guide rail includes a straight part and a curved part and is configured to guide movement of a movable element. The straight-curved guide rail includes: a base part extending in a longitudinal direction of the straight-curved guide rail; and a track part, which is formed on the base part, extends in the longitudinal direction, and has a pair of rail ends, each including a track surface to be in contact with the movable element, on both side portions of the straight-curved guide rail in a width direction of the straight-curved guide rail. A region of the straight-curved guide rail, which includes an end portion of the straight-curved guide rail in the longitudinal direction, includes a low-stiffness region in which portions including the track surfaces have lower stiffness than stiffness of other region.

A linear motion guide unit includes a rail having a first raceway surface, a slider relatively movably attached to the rail, and a plurality of rolling elements. The slider includes a carriage, an end cap, and an end seal. The end seal includes a first lip portion exposed outwardly on one side in the longitudinal direction and in contact with the rail, and a second lip portion disposed inwardly of the first lip portion and in contact with the rail. The second lip portion has a negative allowance of interference that is greater in a first region facing the first raceway surface than in a second region facing a surface other than the first raceway surface.

A linear motion unit includes: a linear motion mechanism including a track member and a moving member; and a housing including a fastener. The fastener includes a first element, a second element meshable with the first element, a first slider, and a second slider located away from the first slider in longitudinal directions. The first slider and the second slider cause the first element and the second element to be separated from each other when the first slider and the second slider move away from each other, and cause the first element and the second element to mesh with each other when the first slider and the second slider move toward each other. The first slider and the second slider are fixable to the moving member.