An aircraft tail rotor system includes a rotating pitch change shaft, a translating element, and a pitch change bearing assembly including a first bearing and a second bearing. The pitch change bearing assembly is operable to transmit movement of the translating element to the rotating pitch change shaft via the first bearing or the second bearing. A failure section is formed at an interface between the first bearing and the translating element. When the failure section decouples the first bearing from the translating element such that the first bearing does not transmit movement of the translating element to the rotating pitch change shaft, the second bearing transmits movement of the translating element to the rotating pitch change shaft.

An aircraft tail rotor system includes a rotating pitch change shaft, a translating element, and a pitch change bearing assembly including a first bearing and a second bearing. The pitch change bearing assembly is operable to transmit movement of the translating element to the rotating pitch change shaft via the first bearing or the second bearing. A failure section is formed at an interface between the first bearing and the translating element. When the failure section decouples the first bearing from the translating element such that the first bearing does not transmit movement of the translating element to the rotating pitch change shaft, the second bearing transmits movement of the translating element to the rotating pitch change shaft.

A rolling deep groove ball bearing includes a bearing outer ring (1), a bearing inner ring (2), a plurality of large rolling balls (3) and special-shaped rollers (4), where the large rolling balls (3) and special-shaped rollers (4) are arranged between the bearing inner ring (1) and the bearing outer ring (2), and the large rolling balls (3) and the special-shaped rollers (4) are arranged at intervals. For the rolling deep groove ball bearing, the rolling balls (3) and the bearing raceway realize the pure rolling, where high linear velocity is subjected; the bearing capacity is large; the noise is low; the reliability is high and the service life is long. The deep groove ball bearing has no gap for installing balls and is simply assembled.

A rolling deep groove ball bearing includes a bearing outer ring (1), a bearing inner ring (2), a plurality of large rolling balls (3) and special-shaped rollers (4), where the large rolling balls (3) and special-shaped rollers (4) are arranged between the bearing inner ring (1) and the bearing outer ring (2), and the large rolling balls (3) and the special-shaped rollers (4) are arranged at intervals. For the rolling deep groove ball bearing, the rolling balls (3) and the bearing raceway realize the pure rolling, where high linear velocity is subjected; the bearing capacity is large; the noise is low; the reliability is high and the service life is long. The deep groove ball bearing has no gap for installing balls and is simply assembled.

A vehicle main electric motor includes: a ring-shaped filling chamber, which is formed in contact with a ball bearing and a roller bearing in a direction of a rotation shaft, for filling with a semi-solid lubricant, and which has a central axis concentric with the rotation shaft; and a discharge section connected to the filling chamber, for inflow of the semi-solid lubricant from the filling chamber. A display member, which has a specific gravity lower than a specific gravity of the semi-solid lubricant, is arranged, in an interior of the discharge section, at an initial position that is a position not reached by the semi-solid lubricant during an initial greasing. The discharge section has a retaining part for retaining, at a movement position that is a determined position within the discharge section, the display member moving in a greasing direction due to pressure of the semi-solid lubricant during a supplemental greasing. At least a portion of visible light from the exterior reaches at least a portion of the movement position.

A vehicle main electric motor includes: a ring-shaped filling chamber, which is formed in contact with a ball bearing and a roller bearing in a direction of a rotation shaft, for filling with a semi-solid lubricant, and which has a central axis concentric with the rotation shaft; and a discharge section connected to the filling chamber, for inflow of the semi-solid lubricant from the filling chamber. A display member, which has a specific gravity lower than a specific gravity of the semi-solid lubricant, is arranged, in an interior of the discharge section, at an initial position that is a position not reached by the semi-solid lubricant during an initial greasing. The discharge section has a retaining part for retaining, at a movement position that is a determined position within the discharge section, the display member moving in a greasing direction due to pressure of the semi-solid lubricant during a supplemental greasing. At least a portion of visible light from the exterior reaches at least a portion of the movement position.

A bearing system is provided in one example embodiment and may include an inner bearing assembly comprising a spherical bearing and an outer race; an outer bearing assembly comprising a plurality of cylindrical roller bearings, an inner race, and an outer race; and a race element comprising an inner surface and an outer surface, wherein the outer surface of the race element is the inner race for the outer bearing assembly and the inner surface of the race element is associated with the outer race for the inner bearing assembly. The inner bearing assembly allows tilting movements of the bearing system and the outer bearing assembly allows rotational movements and supports, at least in part, radial loads for the bearing system.

A bearing system is provided in one example embodiment and may include an inner bearing assembly comprising a spherical bearing and an outer race; an outer bearing assembly comprising a plurality of cylindrical roller bearings, an inner race, and an outer race; and a race element comprising an inner surface and an outer surface, wherein the outer surface of the race element is the inner race for the outer bearing assembly and the inner surface of the race element is associated with the outer race for the inner bearing assembly. The inner bearing assembly allows tilting movements of the bearing system and the outer bearing assembly allows rotational movements and supports, at least in part, radial loads for the bearing system.

One aspect of the present disclosure provides a first bearing including an inner ring, an outer ring, and cylindrical rollers. The inner ring includes: an insertion groove formed in a lower surface for inserting the cylindrical rollers between an inner raceway surface and an outer raceway surface; a blocking plug configured to block the insertion groove, the blocking plug having a part of the inner raceway surface formed thereon; and a bolt for securing the blocking plug in the insertion groove. In the mating surface of the blocking plug contacted with the bottom surface of the insertion groove, when the shortest length between the bolt insertion hole and the inner raceway surface is shown as La, and the shortest length between the bolt insertion hole and the inner peripheral surface is shown as Lb, the shortest lengths La and Lb satisfy the following formula: La/Lb>0.65.

One aspect of the present disclosure provides a first bearing including an inner ring, an outer ring, and cylindrical rollers. The inner ring includes: an insertion groove formed in a lower surface for inserting the cylindrical rollers between an inner raceway surface and an outer raceway surface; a blocking plug configured to block the insertion groove, the blocking plug having a part of the inner raceway surface formed thereon; and a bolt for securing the blocking plug in the insertion groove. In the mating surface of the blocking plug contacted with the bottom surface of the insertion groove, when the shortest length between the bolt insertion hole and the inner raceway surface is shown as La, and the shortest length between the bolt insertion hole and the inner peripheral surface is shown as Lb, the shortest lengths La and Lb satisfy the following formula: La/Lb>0.65.