130 are arranged between the outer ring 110 and the inner ring 120 such that the outer ring 110 is rotatably coupled to the inner ring 120 in general the inner ring 120 is mounted to a first member such as a shaft and the outer ring 110 is coupled to a second member such as a housing to enable relative rotational movement between the first and second members in one exemplary embodiment roller bearing assembly 100 may form part of a pneumatically actuated aircraft engine valve and provides an enhanced load carrying capability in a relatively small possible package of course other applications may also be provided as noted below in some exemplary embodiments the roller bearing assembly 100 does not require spacers to maintain separation between the rolling elements 130 and or a cage to retain the rolling elements within the outer and or inner rings 110 120 the rolling elements 130 include a number of elements which in one embodiment is a full complement of rolling elements that is as many rolling elements as possible are respectively arranged between the outer and inner circumferences of the outer and inner rings 110 120 the rolling elements 130 are generally cylindrical in further embodiments the rolling elements 130 can be ball bearings and or needle bearings in general the outer and inner rings 110 120 share a first axis 140 and the rolling elements 130 each have an axis e g axis 142 that is parallel to the first axis 140 as such the roller bearing assembly 100 has non tapered rolling elements 130 in one exemplary embodiment each rolling element has.