TRIPOD-TYPE CONSTANT SPEED UNIVERSAL JOINT

Title:

TRIPOD-TYPE CONSTANT SPEED UNIVERSAL JOINT

Document Type and Number:

WIPO Patent Application WO/2020/137924

Kind Code:

A1

Abstract:

This tripod-type constant speed universal joint (1) comprises: an outside joint member (2) provided with a track groove (5); a tripod member (3) provided with three leg shafts (7) which project in a radial direction; a roller (11) that is inserted into the track groove (5); and an inner ring (12) externally fitted to the leg shafts (7) and rotatably supporting the roller (11). On the surface of each of the leg shafts (7), a hardened layer (16) is formed by means of carburization, quenching, and tempering. The tripod member (3) is formed using a steel material having a carbon content of 0.23% to 0.44%. A Ts torque is set to be 0.3 times the minimum static torsional torque required for a shaft (9) that is coupled to the tripod member (3) to twist and break, and the effective hardened-layer depth (H) of the hardened layer (16) having a hardness limit of 600HV is made to be equal to or greater than the maximum shearing stress depth (Z) occurring at the time that the Ts torque is loaded.

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Inventors:

ITAGAKI TAKU (JP)
SUGIYAMA TATSURO (JP)
KAWATA SHOUTA (JP)

Application Number:

PCT/JP2019/050225

Publication Date:

July 02, 2020

Filing Date:

December 20, 2019

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)

International Classes:

F16D3/205; F16D3/20

Foreign References:

JP2001208091A	2001-08-03
JP2017061988A	2017-03-30
JP2017180675A	2017-10-05
JPS599618B2	1984-03-03

Other References: