Radial needle bearing

Patent metadata

Field	Value
Publication number	US-9360044-B2
Application number	US-87852610-A
Country	US
Kind code	B2
Filing date	Sep 9, 2010
Priority date	Apr 30, 2010
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

In rollers used in a radial needle bearing, the circularity of crowning sections provided at opposite ends of each roller is 0.6 μm or smaller. This allows for reduction of sound (noise) produced when the radial needle bearing rotates by itself and can also allow for reduction of sound (noise) of a rotational machine when the radial needle bearing is installed and rotates therein.

First claim

What is claimed is:

1. A rotational machine, comprising:
a shaft;
a radial needle bearing, the radial needle bearing having a positive radial clearance comprising:
rollers used in the radial needle bearing;
a cage that holds the rollers at a predetermined pitch; and
a cylindrical outer ring that accommodates the rollers and the cage therein,
wherein the circularity of crowning sections provided at opposite ends of each roller is 0.6 μm or smaller, and
wherein the radial needle bearing supports the shaft of the rotational machine.

2. A rotational machine according to claim 1 , wherein the positive radial clearance is between 10 μm and 30 μm.

3. A rotational machine according to claim 1 , wherein the radial needle bearing is attached such that an outer peripheral surface of the outer ring comes into contact with an inner peripheral surface of a boss section provided at a back surface of an end plate of an orbiting scroll member.

4. A rotational machine according to claim 1 , wherein an area load applied to the rollers is varied over time.

5. A rotational machine according to claim 1 , wherein the shaft is provided with a crank mechanism at a position decentered from the axis of the shaft.

6. A rotational machine according to claim 1 , further comprising: an orbiting scroll member having a self-rotating prevention mechanism.

7. A rotational machine according to claim 5 , further comprising: an orbiting scroll member having a self-rotating prevention mechanism.

8. A rotational machine according to claim 1 , wherein the rollers have straight portions.

Assignees

• Iketaka Goshi
• Takahashi Shinichi
• Hagita Takayuki
• Yoshioka Akinori
• Hirano Takeshi
• Mitsubishi Heavy Ind Ltd

Inventors

• Iketaka Goshi
• Takahashi Shinichi
• Hagita Takayuki
• Yoshioka Akinori
• Hirano Takeshi

Classifications

• F16C2240/50

  Crowning, e.g. crowning height or crowning radius · CPC title

• F16C2360/42

  Pumps with cylinders or pistons · CPC title

• F16C19/46 Primary

  with one row or needles · CPC title

• F16C33/34

  Rollers; Needles · CPC title

• F16C2360/00

  Engines or pumps · CPC title