Tapered roller bearing and manufacturing method for tapered roller bearing

Patent metadata

Field	Value
Publication number	US-10634192-B2
Application number	US-201615760741-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 18, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

In a tapered roller bearing, neighboring pillar parts constitute a first engagement allowance in which an inner diameter-side opening width of each of the pockets becomes smaller than a roller diameter at a position of the opening width in a direction of a rotation axis of each of the tapered rollers at at least a part of an inner diameter side of each of the pockets, and constitute a second engagement allowance in which an outer diameter-side opening width of each of the pockets becomes smaller than the roller diameter at a position of the opening width in the direction at at least a part of an outer diameter side of each of the pockets. Bumps are formed on an inner surface of the small diameter ring part in the pockets. Small diameter-side end faces of the tapered rollers facing the bumps are substantially flat surfaces.

First claim

The invention claimed is:

1. A tapered roller bearing comprising:
an outer ring having an outer ring raceway surface on an inner circumferential surface thereof;
an inner ring having an inner ring raceway surface on an outer circumferential surface thereof;
a plurality of tapered rollers that are rollingly arranged between the outer ring raceway surface and the inner ring raceway surface; and
a cage formed in a shape in which a large diameter ring part and a small diameter ring part separated in an axial direction are connected by a plurality of pillar parts that are in sliding contact with outer circumferential surfaces of the tapered rollers, and having a plurality of pockets that house and retain the tapered rollers,
the inner ring including a large diameter-side end and a small diameter-side end, and only the large diameter-side end being formed with a flange part, wherein:
each of the pillar parts includes a first protrusion that retains each of the tapered rollers on an inner diameter side of each of the pockets and a second protrusion that retains each of the tapered rollers on an outer diameter side of each of the pockets;
bumps are formed on only an inner surface of the small diameter ring part in the pockets;
end faces of the tapered rollers facing the bumps are substantially flat surfaces or recesses; and
apexes of the bumps are provided closer to inner diameter-side openings of the pockets than positions through which the rotation axes of the tapered rollers pass on the inner surface of the small diameter ring part.

2. The tapered roller bearing according to claim 1 , wherein
the first and second protrusions are arranged at positions at which the protrusions do not overlap each other in the axial direction.

3. The tapered roller bearing according to claim 1 , wherein
the cage has a ring-like cutout part formed on at least one of an inner circumferential surface of the large diameter ring part and an outer circumferential surface of the small diameter ring part such that a thickness of the ring part is thinner than thicknesses of the pillar parts.

4. A tapered roller bearing comprising:
an outer ring having an outer ring raceway surface on an inner circumferential surface thereof;
an inner ring having an inner ring raceway surface on an outer circumferential surface thereof;
a plurality of tapered rollers that are rollingly arranged between the outer ring raceway surface and the inner ring raceway surface; and
a cage formed in a shape in which a large diameter ring part and a small diameter ring part separated in an axial direction are connected by a plurality of pillar parts that are in sliding contact with outer circumferential surfaces of the tapered rollers, and having a plurality of pockets that house and retain the tapered rollers,
the inner ring including a large diameter-side end and a small diameter-side end, and only the large diameter-side end being formed with a flange part, wherein:
the neighboring pillar parts constitute a first engagement allowance in which an inner diameter-side opening width of each of the pockets becomes smaller than a roller diameter at a position of the opening width in a direction of a rotation axis of each of the tapered rollers at at least a part of an inner diameter side of each of the pockets;
the neighboring pillar parts constitute a second engagement allowance in which an outer diameter-side opening width of each of the pockets becomes smaller than the roller diameter at a position of the opening width in the direction of the rotation axis of each of the tapered rollers at at least a part of an outer diameter side of each of the pockets;
bumps are formed on an inner surface of the small diameter ring part in the pockets;
end faces of the tapered rollers facing the bumps are substantially flat surfaces; and
apexes of the bumps are provided closer to inner diameter-side openings of the pockets than positions through which the rotation axes of the tapered rollers pass on the inner surface of the small diameter ring part.

5. The tapered roller bearing according to claim 4 , wherein
at least a part of each of the pillar parts that constitute the first engagement allowance on the inner diameter side of each of the pockets and at least a part of each of the pillar parts that constitute the second engagement allowance on the outer diameter side of each of the pockets are arranged at positions that do not overlap each other in the axial direction.

6. The tapered roller bearing according to claim 4 , wherein
at least a part of each of the pillar parts that constitute the first engagement allowance on the inner diameter side of each of the pockets and at least a part of each of the pillar parts that constitute the second engagement allowance on the outer diameter side of each of the pockets have tapered shapes.

7. The tapered roller bearing according to claim 4 , wherein
the cage has a ring-like cutout part formed on at least one of an inner circumferential surface of the large diameter ring part and an outer circumferential surface of the small diameter ring part such that a thickness of the ring part is thinner than thicknesses of the pillar parts.

8. A tapered roller bearing comprising:
an outer ring having an outer ring raceway surface on an inner circumferential surface thereof;
an inner ring having an inner ring raceway surface on an outer circumferential surface thereof;
a plurality of tapered rollers that are rollingly arranged between the outer ring raceway surface and the inner ring raceway surface; and
a cage formed in a shape in which a large diameter ring part and a small diameter ring part separated in an axial direction are connected by a plurality of pillar parts that are in sliding contact with outer circumferential surfaces of the tapered rollers, and having a plurality of pockets that house and retain the tapered rollers,
the inner ring including a large diameter-side end and a small diameter-side end, and only the large diameter-side end being formed with a flange part, wherein:
the neighboring pillar parts constitute a first engagement allowance in which an inner diameter-side opening width of each of the pockets becomes smaller than a roller diameter at a position of the opening width in a direction of a rotation axis of each of the tapered rollers at at least a part of an inner diameter side of each of the pockets;
the neighboring pillar parts constitute a second engagement allowance in which an outer diameter-side opening width of each of the pockets becomes smaller than the roller diameter at a position of the opening width in the direction of the rotation axis of each of the tapered rollers at at least a part of an outer diameter side of each of the pockets;
recesses are formed in small diameter-side end faces of the tapered rollers;
bumps protruding to enter the recesses are formed in an inner surface of the small diameter ring part in the pockets; and
apexes of the bumps are provided closer to inner diameter-side openings of the pockets than positions through which the rotation axes of the tapered rollers pass on the inner surface of the small diameter ring part.

9. The tapered roller bearing according to claim 8 , wherein
at least a part of each of the pillar parts that constitute the first engagement allowance on the inner diameter side of each of the pockets and at least a part of each of the pillar parts that constitute the second engagement allowance on the outer diameter side of each of the pockets are arranged at positions that do not overlap each other in the axial direction.

10. The tapered roller bearing according to claim 8 , wherein
at least a part of each of the pillar parts that constitut

Assignees

• Nsk Ltd

Inventors

• YOSHIWARA Hidekazu
• Magami Hidenobu
• Kondo Masateru
• Koganei Makoto
• Kiyono Shunichi

Classifications

• F16C43/065

  in cages · CPC title

• F16C33/4635 Primary

  made from plastic, e.g. injection moulded window cages · CPC title

• F16C33/4676

  of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers · CPC title

• F16C19/364

  with tapered rollers, i.e. rollers having essentially the shape of a truncated cone · CPC title

• F16C33/4682 Primary

  of the end walls, e.g. interaction with the end faces of the rollers · CPC title