Tapered roller bearing

Patent metadata

Field	Value
Publication number	US-9797449-B2
Application number	US-201615373004-A
Country	US
Kind code	B2
Filing date	Dec 8, 2016
Priority date	Dec 17, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A tapered roller bearing includes an outer ring, an inner ring, a plurality of tapered rollers, and a lubricant holding member. The lubricant holding member is provided integrally with the outer ring. The lubricant holding member includes a tubular portion and an annular portion. The tubular portion extends in an axial direction of the outer ring. The tubular portion is positioned at a first end of the outer ring in the axial direction. The annular portion extends inward in a radial direction of the outer ring, from the first end of the tubular portion in the axial direction. A plurality of recessed portions is formed in an inner peripheral surface of the tubular portion in juxtaposition in the circumferential direction.

First claim

What is claimed is:

1. A tapered roller bearing comprising:
an outer ring having a first raceway surface on an inner peripheral surface of the outer ring;
an inner ring having a second raceway surface on an outer peripheral surface of the inner ring and arranged coaxially with the outer ring;
a plurality of tapered rollers provided in a space formed between the first raceway surface and the second raceway surface and arranged in a circumferential direction of the outer ring;
a lubricant holding member provided integrally with the outer ring, wherein the lubricant holding member includes:
a tubular portion extending in an axial direction of the outer ring and positioned at a first end of the outer ring in the axial direction; and
an annular portion extending inward in a radial direction of the outer ring from the first end in the axial direction of the tubular portion, and
a plurality of recessed portions is formed in an inner peripheral surface of the tubular portion in juxtaposition in the circumferential direction.

2. The tapered roller bearing according to claim 1 , wherein
the tubular portion may be formed separately from the outer ring.

3. The tapered roller bearing according to claim 2 , wherein
each of the recessed portions is shaped generally like a rectangle as viewed in the radial direction, and a length of each of the recessed portions in the axial direction is larger than a length of the recessed portion in the circumferential direction.

4. The tapered roller bearing according to claim 3 , wherein
the recessed portions are formed at regular intervals in the circumferential direction,
a number of the recessed portions is at least n that satisfies Expression (1),

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⁢
°

2
⁢

⁢
θ

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n
<

360
⁢
°

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⁢

⁢
θ

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1

(
1
)

in Expression (1), an integer is denoted by n, and an angle satisfying cos θ=r/R is denoted by θ, a radius of the inner peripheral surface of the tubular portion is denoted by R, and a radius of an inner peripheral edge of the annular portion is denoted by r.

5. The tapered roller bearing according to claim 2 , wherein
the recessed portions are formed at regular intervals in the circumferential direction,
a number of the recessed portions is at least n that satisfies Expression (1),

360
⁢
°

2
⁢

⁢
θ

≦
n
<

360
⁢
°

2
⁢

⁢
θ

+
1

(
1
)

in Expression (1), an integer is denoted by n, and an angle satisfying cos θ=r/R is denoted by θ, a radius of the inner peripheral surface of the tubular portion is denoted by R, and a radius of an inner peripheral edge of the annular portion is denoted by r.

6. The tapered roller bearing according to claim 1 , wherein
the outer ring includes a thin-walled tube portion formed at the first end of the outer ring in the axial direction by an annular step provided on the inner peripheral surface of the outer ring, the thin-walled tube portion extending in the axial direction,
the tubular portion includes:
the thin-walled tube portion; and
an inner tube portion connected to an outer peripheral edge of the annular portion at a first end of the inner tube portion in the axial direction and having an outer peripheral surface contacting an inner peripheral surface of the thin-walled tube portion in the radial direction,
a plurality of cutouts or slots is formed in the inner tube portion so as to be arranged in the circumferential direction, and
the recessed portions are implemented so as to include the cutouts or the slots.

7. The tapered roller bearing according to claim 6 , wherein
each of the recessed portions is shaped generally like a rectangle as viewed in the radial direction, and a length of each of the recessed portions in the axial direction is larger than a length of the recessed portion in the circumferential direction.

8. The tapered roller bearing according to claim 7 , wherein
the recessed portions are formed at regular intervals in the circumferential direction,
a number of the recessed portions is at least n that satisfies Expression (1),

360
⁢
°

2
⁢

⁢
θ

≦
n
<

360
⁢
°

2
⁢

⁢
θ

+
1

Assignees

• Jtekt Corp

Inventors

• Suzuki Akiyuki

Classifications

• F16C19/364

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

• F16C33/6651 Primary

  in recesses or cavities provided in retainers, races or rolling elements · CPC title

• F16C2240/70

  Diameters; Radii · CPC title

• F16C2240/40

  Linear dimensions, e.g. length, radius, thickness, gap · CPC title

• F16C33/664 Primary

  Retaining the liquid in or near the bearing · CPC title