Title:
FIXED-TYPE CONSTANT-VELOCITY UNIVERSAL JOINT
Document Type and Number:
WIPO Patent Application WO/2019/003765
Kind Code:
A1
Abstract:
A fixed-type constant-velocity universal joint, comprising: an outer-side joint member in which a plurality of track grooves extending in a longitudinal direction is formed in a spherical inner peripheral surface, and which has an open side and a recessed side separated in an axial direction; an inner-side joint member in which a plurality of track grooves extending in the longitudinal direction is formed in a spherical outer peripheral surface so as to oppose the track grooves of the outer-side joint member; torque-transmitting balls fitted in between the opposing track grooves; and a holder which holds the torque-transmitting balls, and in which are formed a spherical outer peripheral surface guided to the spherical outer peripheral surface of the outer-side joint member and a spherical inner peripheral surface guided to the spherical outer peripheral surface of the inner-side joint member; wherein the fixed-type constant-velocity universal joint is characterized in that: the track grooves 7 of the outer-side joint member 2 are configured from an arcuate first track groove part 7a disposed in the recessed side, and a linear second track groove part 7b disposed in the open side; the center of curvature of a track center line Xa of the first track groove part 7a is axially offset from a joint center O toward the recessed side; a track center line Xb of the second track groove part 7b is formed at an incline in a direction such that the distance to an axis line N-N of the joint decreases toward the open side, the track center line Xb being smoothly connected to the track center line Xa of the first track groove part 7a; and track center lines Y of the track grooves 9 of the inner-side joint member are formed in mirror symmetry with the track center lines X of the pair of track grooves 7 of the outer-side joint member, the reference being a plane P that includes the joint center O at a working angle of 0º and that is orthogonal to the axis line N-N of the joint.
Inventors:
FUJIO TERUAKI (JP)
FUNAHASHI MASASHI (JP)
FUNAHASHI MASASHI (JP)
Application Number:
PCT/JP2018/020544
Publication Date:
January 03, 2019
Filing Date:
May 29, 2018
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F16D3/224
Foreign References:
| JP2004518083A | 2004-06-17 | |||
| JP2001153148A | 2001-06-08 | |||
| JPH09291945A | 1997-11-11 |
Attorney, Agent or Firm:
SHIROMURA Kunihiko et al. (JP)
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