Title:
TRIPOD-TYPE CONSTANT-VELOCITY UNIVERSAL JOINT
Document Type and Number:
WIPO Patent Application WO/2023/210365
Kind Code:
A1
Abstract:
In a state in which the joint has a regular operating angle and the axial line of an inner ring 12 is not inclined with respect to the axial line of a leg shaft 32, when a radius of curvature r and a minor axis-major axis ratio b/a at which the contact area between an inner ring inner circumferential surface 12a and a leg shaft outer circumferential surface is minimized are each given as a reference value, the minor axis-major axis ratio b/a is set to the corresponding reference value, and the radius of curvature r is made smaller than the corresponding reference value. In addition, the carbon content in the core part of a tripod member 3 is set to 0.23 to 0.44%, and a hardened layer is formed through carburizing and quenching on the surface of each leg shaft 32 of the tripod member 3. When a Ts torque is defined as 0.3 times a minimum static torsional torque that causes torsional breaking of a shaft 8 coupled to the tripod member 3, the effective hardened layer depth of a hardened layer 16 with a hardness limit of 600 HV is set to be larger than or equal to a shearing stress depth under application of the Ts torque.
Inventors:
KAWATA SHOTA (JP)
YANG JUNGMU (JP)
FUJIWARA HIDETO (JP)
USHIO KAZUYA (JP)
TAKESHITA SHO (JP)
NISHIKAWA TSUBASA (JP)
YANG JUNGMU (JP)
FUJIWARA HIDETO (JP)
USHIO KAZUYA (JP)
TAKESHITA SHO (JP)
NISHIKAWA TSUBASA (JP)
Application Number:
PCT/JP2023/014824
Publication Date:
November 02, 2023
Filing Date:
April 12, 2023
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F16D3/205; F16D3/20
Foreign References:
| JP2007064324A | 2007-03-15 | |||
| JP2020106087A | 2020-07-09 | |||
| JP2000320563A | 2000-11-24 |
Attorney, Agent or Firm:
SHIROMURA Kunihiko et al. (JP)
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