Abstract: A double-row cylindrical roller bearing employs a cross roller bearing for one cylindrical roller bearing and a parallel cylindrical roller bearing for the other cylindrical roller bearing. The relative positions of a first cylindrical roller on the cross roller bearing part side and a second cylindrical roller on the parallel cylindrical roller bearing part side are not restricted in the direction of the bearing center axis lines thereof. As a result, a bearing having high rigidity and being easy to process and assemble can be achieved at low cost. Increase in friction torque in bearing sliding sections and fluctuation in bearing properties can also be suppressed.

Abstract: A double-row cylindrical roller bearing employs a cross roller bearing for one cylindrical roller bearing and a parallel cylindrical roller bearing for the other cylindrical roller bearing. The relative positions of a first cylindrical roller on the cross roller bearing part side and a second cylindrical roller on the parallel cylindrical roller bearing part side are not restricted in the direction of the bearing center axis lines thereof. As a result, a bearing having high rigidity and being easy to process and assemble can be achieved at low cost. Increase in friction torque in bearing sliding sections and fluctuation in bearing properties can also be suppressed.

Abstract: A combined cylindrical roller bearing is provided with first and second angular cylindrical roller bearings coaxially disposed in parallel, and a shim plate sandwiched between first and second inner races of these angular cylindrical roller bearings. A gap between the first and second inner races is adjusted by the shim plate. First and second cylindrical rollers do not have the relative positions thereof restricted in the direction of the bearing center axis line thereof. Pressurization of the first and second angular cylindrical roller bearings can be managed appropriately by the shim plate. Different from double-row angular cylindrical roller bearings, it is not required to raise the precision in processing and assembly of the inner and outer races to the tolerance level of cylindrical rollers, processing and assembly can be made easy, and cost can be reduced.