Ball bearing for spindle with built-in motor

Patent metadata

Field	Value
Publication number	US-2017191524-A1
Application number	US-201515325241-A
Country	US
Kind code	A1
Filing date	Jul 14, 2015
Priority date	Jul 22, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

An object is to provide a motor-incorporation-spindle ball bearing capable of allowing cooling air which enters inside the bearing of the motor-incorporation-spindle to be discharged smoothly out of the bearing without causing turbulent flow inside the bearing, does not cause a retainer easily to be vibrated, and provides a high level of silent operation. A seal plate has a length to allow air to pass through the bearing from an entrance side toward an exit side substantially straightly without resistance. Therefore, the seal plate is less likely to be exposed to unnecessary force when the air passes through the bearing; the seal plate is prevented from wobble and deformation; stable sealing is ensured; the air is discharged smoothly without causing turbulent flow inside the bearing; a retainer is not easily vibrated, and silent operation is maintained.

First claim

1 . A motor-incorporation-spindle ball bearing comprising: an inner ring; an outer ring; rolling elements between mutually opposed rolling surfaces of the inner ring and the outer ring; a retainer which holds the rolling elements; and a seal plate extending toward the inner ring from an inner diameter surface on each end of the outer ring; wherein the seal plate has a radially inward length of a dimension to allow air to pass through the bearing from an entrance side toward an exit side substantially straightly without resistance.

2 . The motor-incorporation-spindle ball bearing according to claim 1 , wherein the inner ring has a straightly formed outer diameter surface faced by an inner diameter portion of the seal plate.

3 . The motor-incorporation-spindle ball bearing according to claim 1 , wherein the retainer has pockets each making contact with the rolling element at its circumferential contact area which is radially more outward than a PCD of the rolling element.

4 . The motor-incorporation-spindle ball bearing according to claim 1 , wherein the retainer has an inner diameter portion which is located at a radially more outward position than the PCD of the rolling element.

5 . The motor-incorporation-spindle ball bearing according to claim 1 , wherein the outer ring has an inner diameter portion having grease as a lubricant provided therein.

6 . The motor-incorporation-spindle ball bearing according to claim 1 , wherein the outer ring's inner diameter portion is provided with a grease pocket for grease provided therein.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Kanamoto Takahiro
• Koyama Mineo
• NASU Keisuke

Classifications

• F16C19/542

  with two rolling bearings with angular contact · CPC title

• F16C19/06 Primary

  with a single row or balls · CPC title

• F16C33/6614 Primary

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

• F16C33/583

  Details of specific parts of races · CPC title

• F16C33/7869

  mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward · CPC title