Device for measuring rotation accuracy and dynamic torque for radial rolling bearing

• US 6,378,382 B1
• Filed: 11/23/1999
• Issued: 04/30/2002
• Est. Priority Date: 11/24/1998
• Status: Active Grant

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Endou, Ryoma, Noguchi, Shoji
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): ALLEN, ANDRE J
• Application Number:
  US09/447,588
• Time in Patent Office: 889 Days
• Field of Search: 738/622.9, 738/620.8
• US Class Current: 73/862.29
• CPC Class Codes: G01M 13/04 Bearings

Abstract

A device is provided for measuring non-repetitive run-out and dynamic torque simultaneously for a radial rolling bearing, comprising a holder for holding one of the outer and inner races, a pushing member for pushing the holder in an axial direction without confining the holder in both of the radial and rotational directions, a drive shaft for rotatingly driving the other of the outer and inner races, a precision bearing device for rotatingly supporting the drive shaft, a displacement sensor for measuring radial displacement of the one of the outer and inner races, a wire having one end connected to a portion which rotates together with the one of the outer and inner races, and a torque sensor connected to the other end of the wire to measure dynamic torque applied to the one of the outer and inner races.

Claims

1. A device for measuring rotation accuracy and dynamic force of a radial rolling bearing comprising an outer race having an inner peripheral surface formed with an outer ring raceway, an inner race having an outer peripheral surface formed with an inner ring raceway, a plurality of rolling bodies provided between the outer ring raceway and the inner ring raceway,

the device comprising a holder for holding one of the outer and inner races, a pushing member pushing the holder in an axial direction, a drive shaft for rotatingly driving the other one of the outer and inner races, a precision bearing device rotatingly supporting the drive shaft, a displacement sensor for measuring radial displacement of the one of the outer and inner races, a wire having one end connected to a portion of the holder which rotates together with one of the outer and inner races, and a torque sensor connected to the other end of the wire to measure dynamic torque applied to the one of the outer and inner races,

wherein the pushing member does not confine the holder in either a radial or a rotational direction when pushing the holder.

2. The device of claim 1, wherein the rotation accuracy is non-repetitive run-out.