Caged roller assembly and reduction gear unit using the same

A caged roller assembly which comprises:

• a roller retainer including a large-diameter circumferential ring body having ends opposite to each other and a pair of annular flanks extending radially inwardly from the respective ends of the circumferential ring body, said circumferential ring body having a plurality of circumferentially spaced pockets defined therein;
• a plurality of rollers rotatably carried by the roller retainer and rotatably positioned within the respective pockets, each of said rollers having opposite end faces each formed with an axially inwardly extending bearing recess defined therein;
• and
• bearing bosses formed in each of the annular flanks in a circular row one for each of the pockets, the circular row of the bearing bosses in each annular flank being aligned with a pitch circle defined by respective axes of rotation of the rollers that are rotatably positioned within the associated pockets, said bearing bosses in the annular flanks being rotatably engaged in the bearing recesses on the opposite end faces of the associated rollers, said circumferential ring body having a diameter greater than the pitch circle of the rollers,
• wherein each of the pockets is defined by opposite end walls and opposite side walls, leaving a pillar that is situated between the neighboring pockets while extending between the annular flanks, said opposite side walls of the respective pocket serving as roller guides, wherein the pillar has a transverse sectional shape wherein a peripheral lip region of an outer peripheral surface of the pillar is positioned radially inwardly of the outer peripheral surface of the circumferential ring body.

A caged roller assembly which comprises:

• a roller retainer including a small-diameter circumferential ring body having ends opposite to each other and a pair of annular flanks extending radially outwardly from the respective ends of the circumferential ring body, said circumferential ring body having a plurality of circumferentially spaced pockets defined therein;
• a plurality of rollers rotatably carried by the roller retainer and rotatably positioned within the respective pockets, each of said rollers having opposite end faces each formed with an axially inwardly extending bearing recess defined therein;
• and
• bearing bosses formed in each of the annular flanks in a circular row one for each of the pockets, the circular row of the bearing bosses in each annular flank being aligned with a pitch circles defined by respective axes of rotation of the rollers that are rotatably positioned within the associated pockets, said bearing bosses in the annular flanks being rotatably engaged in the bearing recesses on the opposite end faces of the associated rollers, said circumferential ring body having a diameter smaller than the pitch circle of the rollers,
• wherein each of the bearing bosses protrudes outwardly from the respective annular flank a distance smaller than a depth of the respective bearing recess on the end face of each roller.

A caged roller assembly which comprises:

• a roller retainer including a small-diameter circumferential ring body having ends opposite to each other and a pair of annular flanks extending radially outwardly from the respective ends of the circumferential ring body, said circumferential ring body having a plurality of circumferentially spaced pockets defined therein;
• a plurality of rollers rotatably carried by the roller retainer and rotatably positioned within the respective pockets, each of said rollers having opposite end faces each formed with an axially inwardly extending bearing recess defined therein;
• and
• bearing bosses formed in each of the annular flanks in a circular row one for each of the pockets, the circular row of the bearing bosses in each annular flank being aligned with a pitch circles defined by respective axes of rotation of the rollers that are rotatably positioned within the associated pockets, said bearing bosses in the annular flanks being rotatably engaged in the bearing recesses on the opposite end faces of the associated rollers, said circumferential ring body having a diameter smaller than the pitch circle of the rollers,
• wherein each of the pockets is defined by opposite end walls and opposite side walls, leaving a pillar that is situated between the neighboring pockets while extending between the annular flanks, said opposite side walls of the respective pocket serving as roller guides, wherein the pillar has a transverse sectional shape wherein a peripheral lip region of an inner peripheral surface of the pillar is positioned radially outwardly of the inner peripheral surface of the circumferential ring body.