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    • 10. 发明专利
    • Method of manufacturing a tripod type constant velocity joint
    • JP5377908B2
    • 2013-12-25
    • JP2008220045
    • 2008-08-28
    • Ntn株式会社
    • 純一 五十公野健司 小中
    • F16D3/20B21J5/02B21K1/14F16D3/205
    • F16D3/2055B21J5/025B21K1/762F16D2250/00Y10T29/49826
    • Provided are a tripod-type constant-velocity universal joint which is capable of reducing weight of a journal raw profile to thereby reduce the number of manufacturing steps and in which forging of journals is facilitated, and a method of manufacturing the same. A leading end corner portion (32) of a journal raw profile (54) is held with use of a die (X) and forged. In this case, in a state in which a relief portion (35) is provided on a leading end side of the die (X), a part including an elliptically longitudinal side of the leading end corner portion (32) of the journal raw profile (54) is held with use of the die (X). In the die (X), inner walls of a part at which the leading end corner portion (32) of the journal raw profile (54) is held constitute tapering surfaces (33). By the forging, at the part including the elliptically longitudinal side relatively on a leading end portion side of an outer peripheral surface (30) of each of journals (4), edge portions (21) reducing a lateral sectional area of each of the journals (4) toward a leading end side thereof are formed, and tapered surfaces (20) are formed on the leading end side of the edge portions (21). Centering on each of the journals (4) is performed by causing two points on an elliptically longitudinal side of the edge portions (21) to abut against a centering jig.