Superfinishing machine, superfinishing method and outer ring of bearing having superfinished raceway surface

Patent metadata

Field	Value
Publication number	US-9574609-B2
Application number	US-201214356690-A
Country	US
Kind code	B2
Filing date	Jun 22, 2012
Priority date	Nov 8, 2011
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A superfinishing machine and a superfinishing method which can perform axially uniform finishing on a logarithmically crowned surface formed on an inner peripheral surface of an annular member in a short time, and an outer ring of a bearing having a raceway surface superfinished by the superfinishing method, are provided. A superfinishing machine 1 includes a linearly reciprocating mechanism 40 configured to linearly reciprocate a grinding stone 3 held by a pressing section 30 , along a plane B touching a generatrix of the logarithmically crowned surface, and in a direction C inclined by a given angle φ with respect to a center axis O of an outer ring 10.

First claim

The invention claimed is:

1. A superfinishing machine comprising:
a rotation jig configured to hold an annular member such that the annular member is rotatable around a center axis of the annular member, the annular member having a logarithmically crowned surface formed on an inner peripheral surface thereof;
a pressing section configured to hold a grinding stone and to bring a distal end surface of the grinding stone into pressure contact with the logarithmically crowned surface of the annular member rotating around the center axis; and
a linearly reciprocating mechanism configured to linearly reciprocate the grinding stone held by the pressing section, along a plane touching a generatrix of the logarithmically crowned surface, and in a direction inclined by a given angle with respect to the center axis of the annular member, thereby superfinishing the logarithmically crowned surface,
wherein the distal end surface of the grinding stone has a quadrangular shape in a cross section when seen from a radial direction and is formed such that a set of opposite sides is parallel to the inclined direction, and
each side portion of the distal end surface in a circumferential direction is formed with a portion configured to abut against all locations on the logarithmically crowned surface along the inclined direction.

2. The superfinishing machine according to claim 1 , wherein the annular member is an outer ring of a tapered roller bearing, and
the outer ring is rotated around the center axis, and the distal end surface of the grinding stone is brought into pressure contact with a raceway surface, being the logarithmically crowned surface, formed on an inner peripheral surface of the outer ring, thereby superfinishing the raceway surface.

3. The superfinishing machine according to claim 1 , wherein the annular member is an outer ring of a cylindrical roller bearing, and
the outer ring is rotated around the center axis, and the distal end surface of the grinding stone is brought into pressure contact with a raceway surface, being the logarithmically crowned surface, formed on an inner peripheral surface of the outer ring, thereby superfinishing the raceway surface.

4. A superfinishing method comprising:
bringing a distal end surface of a grinding stone into pressure contact with a logarithmically crowned surface formed on an inner peripheral surface of an annular member rotating around a center axis thereof to superfinish the logarithmically crowned surface; and
linearly reciprocating the grinding stone in a direction inclined by a given angle with respect to the center axis of the annular member along a plane touching a generatrix of the logarithmically crowned surface,
wherein the distal end surface of the grinding stone has a quadrangular shape in a cross section when seen from a radial direction and is formed such that a set of opposite sides is parallel to the inclined direction, and
each side portion of the distal end surface in a circumferential direction is formed with a portion configured to abut against all locations on the logarithmically crowned surface along the inclined direction.

5. An outer ring of a tapered roller bearing, the outer ring comprising a raceway surface superfinished by the superfinishing method set forth in claim 4 .

6. An outer ring of a cylindrical roller bearing, the outer ring comprising a raceway surface superfinished by the superfinishing method set forth in claim 4 .

Assignees

• UTADA Eiji
• Sensui Natsuki
• Watanabe Takayuki
• Nsk Ltd

Inventors

• UTADA Eiji
• Sensui Natsuki
• Watanabe Takayuki

Classifications

• F16C19/364

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

• B24B19/06 Primary

  for grinding races, e.g. roller races · CPC title

• F16C33/58 Primary

  Raceways; Race rings · CPC title

• F16C33/64 Primary

  Special methods of manufacture · CPC title

• B24B35/00

  Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency · CPC title