Tapered roller bearing

Patent metadata

Field	Value
Publication number	US-2020191197-A1
Application number	US-201716082044-A
Country	US
Kind code	A1
Filing date	Mar 7, 2017
Priority date	Mar 18, 2016
Publication date	Jun 18, 2020
Grant date	—

Abstract

Two projecting portions ( 45 a and 45 b ) configured to guide a tapered roller ( 3 ) on distal end surfaces thereof are formed on a side surface ( 43 a ) of a pillar portion ( 43 ) of a retainer ( 4 ) so as to be separated apart from each other in a roller axis direction. The projecting portions ( 45 a and 45 b ) are separated apart from each other in the roller axis direction with respect to both a small-diameter-side annular portion ( 41 ) and a large-diameter-side annular portion ( 42 ). The projecting portions ( 45 a and 45 b ) each have a force-fit margin (F).

First claim

1 - 16 . (canceled)

17 . A tapered roller bearing, comprising:
an inner ring having an inner raceway surface formed on an outer peripheral surface thereof; an outer ring having an outer raceway surface formed on an inner peripheral surface thereof; a plurality of tapered rollers arranged between the inner raceway surface of the inner ring and the outer raceway surface of the outer ring; and a retainer configured to retain the tapered rollers at a plurality of positions in a circumferential direction, wherein the retainer comprises:
a small-diameter-side annular portion;
a large-diameter-side annular portion; and
a plurality of pillar portions connecting the small-diameter-side annular portion and the large-diameter-side annular portion to each other,
wherein the tapered rollers are each received in a pocket which is defined by the small-diameter-side annular portion, the large-diameter-side annular portion, and adjacent two pillar portions of the retainer, wherein a plurality of projecting portions, which are separated apart from both the small-diameter-side annular portion and the large-diameter-side annular portion in a roller axis direction and are configured to guide the tapered roller on distal end surfaces thereof, are formed on a side surface of each of the pillar portions of the retainer so as to be separated apart from each other in the roller axis direction, and wherein the projecting portions each have a force-fit margin.

18 . The tapered roller bearing according to claim 17 , wherein a guide portion formed of a fracture surface is formed on a radially outer side of each of the distal end surfaces of the projecting portions.

19 . The tapered roller bearing according to claim 17 , wherein a radially inner side of each of the distal end surfaces of the projecting portions is formed of a molded surface.

20 . The tapered roller bearing according to claim 17 , wherein a width A of the projecting portion and an entire width B of the pocket are set so as to satisfy a relationship of B/A=4.5 to 20.

21 . The tapered roller bearing according to claim 17 , wherein a width C of center portions of the guide surfaces and an entire width B of the pocket are set so as to satisfy a relationship of C/B=0.45 to 0.55.

22 . The tapered roller bearing according to claim 17 , wherein the force-fit margin F is set so as to be equal to or larger than 0.05 mm and equal to or smaller than 0.30 mm.

23 . The tapered roller bearing according to claim 17 , wherein the force-fit margin F and a roller diameter G are set so as to satisfy a relationship of G/F=30 to 50.

24 . The tapered roller bearing according to claim 17 , wherein the retainer is formed of a steel plate.

25 . The tapered roller bearing according to claim 17 , wherein a logarithmic crowning is used as a crowning of the tapered roller.

26 . The tapered roller bearing according to claim 17 ,
wherein the retainer is made of resin, and wherein a cross-section height “t” and a pillar width H of the pillar portion satisfy a relationship of H/t<1.5.

27 . The tapered roller bearing according to claim 26 , wherein the pillar portion of the retainer is arranged on a radially outer side with respect to a roller pitch circle.

28 . The tapered roller bearing according to claim 26 , wherein a width A of the projecting portion and an entire width B of the pocket are set so as to satisfy a relationship of B/A=4.5 to 20.

29 . The tapered roller bearing according to claim 26 , wherein a width C of center portions of the guide surfaces and an entire width B of the pocket are set so as to satisfy a relationship of C/B=0.5 to 0.9.

30 . The tapered roller bearing according to claim 26 , wherein the force-fit margin F is set so as to be equal to or larger than 0.20 mm and equal to or smaller than 0.50 mm.

31 . The tapered roller bearing according to claim 26 , wherein the force-fit margin F and a roller diameter G are set so as to satisfy a relationship of G/F=30 to 50.

32 . The tapered roller bearing according to claim 26 , wherein a roller filling ratio γ[%] defined by γ=(Z×G)/(π×PCD) is set so as to satisfy γ>90, where Z represents the number of rollers, G represents a roller diameter, and PCD represents a roller pitch circle diameter.

33 . The tapered roller bearing according to claim 26 , wherein a logarithmic crowning is used as a crowning of the tapered roller.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Kawai Takashi
• Matsushita Tornoki

Classifications

• F16C33/4623

  formed as one-piece cages, i.e. monoblock cages · CPC title

• F16C19/364 Primary

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

• F16C33/4676

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

• F16C33/366

  Tapered rollers, i.e. rollers generally shaped as truncated cones · CPC title

• F16C43/083

  by plastic deformation of the cage · CPC title