Title:
FOUR-POINT CONTACT BEARING
Document Type and Number:
WIPO Patent Application WO/2004/055399
Kind Code:
A1
Abstract:
A four-point contact bearing where heat generation and wear can be constrained by controlling increase in frictional torque in operation under a preload, noise and vibration in high speed rotation are reduced, and bearing life is extended. In a four-point contact bearing (11), d is the diameter of each of balls (17), Dp the pitch circle diameter of the balls (17) arranged between both raceway surfaces (13a, 15a), Ll the distance, on the pitch circle diameter Dp, between adjacent ones of the balls (17), r a curvature radius of grooves as raceway surfaces (13a, 15a) circumscribing the balls (17) on an outer and an inner raceway (13, 15), and &agr a contact angle between each of the raceway surfaces (13a, 15a) and each ball (17). The values of d, Dp, Ll, r, and &agr are defined by predetermined relationships, so that increase in frictional torque is controlled for constrained heat generation and wear even under a preload where an axial clearance (SA) is negative.
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Inventors:
FUKUNAGA MASAFUMI (JP)
Application Number:
PCT/JP2003/015544
Publication Date:
July 01, 2004
Filing Date:
December 04, 2003
Export Citation:
Assignee:
NSK LTD (JP)
FUKUNAGA MASAFUMI (JP)
FUKUNAGA MASAFUMI (JP)
International Classes:
F16C19/16; F16C33/60; F16C33/80; F16C35/06; (IPC1-7): F16C19/06; F16C33/58; F16C33/32
Foreign References:
| JP2002081442A | 2002-03-22 | |||
| JP2001272509A | 2001-10-05 | |||
| JP2000249149A | 2000-09-12 | |||
| JP2002242935A | 2002-08-28 | |||
| JP2002339976A | 2002-11-27 | |||
| US20020061150A1 | 2002-05-23 | |||
| JP2002174247A | 2002-06-21 | |||
| JP2000154825A | 2000-06-06 | |||
| JPH1162975A | 1999-03-05 | |||
| JPH11336795A | 1999-12-07 | |||
| JPH08200358A | 1996-08-06 |
Attorney, Agent or Firm:
Oguri, Shohei (13th Floor ARK Mori Building, 12-32, Akasaka 1-chom, Minato-ku Tokyo, JP)
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