Linear rolling bearing

A linear rolling bearing system comprising a guide rail and a guide carriage that partially surrounds the guide rail and is supported by balls for sliding on two long sides of the guide rail, the balls being arranged on each of the two long sides in at least two parallel, endlessly recirculating rows of balls and with a plurality of spacers inserted in the circulating rows while a spacer is inserted between every two successive balls of a row, wherein, on each long side of a guide rail, a common spacer for both of said two rows is inserted between every two adjacent balls of a first of said two rows and between every two adjacent balls of a second of said two rows wherein each spacer has four concave shaped walls adapted to the balls, wherein each concave shaped wall is provided for one ball, and wherein each concave shaped wall encompasses a part of the ball-surface, which part is less than the half of the peripheral surface of the ball.

A linear rolling bearing comprising a guide rail and a guide carriage that partially surrounds the guide rail and is supported by rolling elements for sliding on two long sides of the guide rail, the rolling elements being arranged on each of the two long sides in at least two parallel, endlessly recirculating rows of rolling elements while being guided by spacers that are situated in said two rows between the rolling elements, wherein, on each long side of the guide rail, every two adjacent rolling elements of a first of said two rows and every two adjacent rolling elements of a second of said two rows are guided in a common spacer for both of said two rows and in a region situated between the two parallel rows of rolling elements, each spacer comprises a V-shaped notch into which a retaining bar fixed on the guide carriage adjacent to each long side of the guide rail engages.