# US 10,478,914 B2 · Method for butt welding, butt welded joint, and outside joint member for constant velocity universal joint > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,478,914 B2 - Document ID: US10478914B2 - Status: Granted - Kind: B2 - Application number: 15/319,097 - Filed: 2015-05-20 - Published: 2017-05-04 - Granted: 2019-11-19 - Earliest claimed: 2014-06-18 - Assignees: Ntn Corporation - Applicants: Naoki Nakagawa; Shintaro Suzuki; Kenichi Nakano; Takuya Fujita; Kiyohiro Suzuki; Renji Natsume; Tatsuro Sugiyama; Masazumi Kobayashi - Inventors: Naoki Nakagawa; Shintaro Suzuki; Kenichi Nakano; Takuya Fujita; Kiyohiro Suzuki; Renji Natsume; Tatsuro Sugiyama; Masazumi Kobayashi - Web page: https://patentgrep.com/patent/US10478914B2 ## CPC - B23K 15/0046: {Welding} - B23K 15/04: for welding annular seams - B23K 26/0823: {Devices involving rotation of the workpiece} - B23K 26/21: by welding - B23K 26/282: of tube sections - B23K 33/006: {for cylindrical workpieces} - F16D 1/027: non-disconnectable, e.g. involving gluing, welding or the like - F16D 3/205: the pins extending radially outwardly from the coupling part - F16D 3/223: the rolling members being guided in grooves in both coupling parts - F16D 3/227: the joints being telescopic - G01N 29/043: {in the interior, e.g. by shear waves} - G01N 29/225: {Supports, positioning or alignment in moving situation} - G01N 29/28: providing acoustic coupling {, e.g. water (impedance matching G10K11/02)} - B23K 2101/04: Tubular or hollow articles - B23K 2103/04: Steel {or steel} alloys - B23K 2103/18: Dissimilar materials - F16D 3/2055: {having three pins, i.e. true tripod joints} - F16D 2003/22326: {Attachments to the outer joint member, i.e. attachments to the exterior of the outer joint member or to the shaft of the outer joint member} - G01N 2291/267: Welds - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract For butt-welding, which includes bringing joining end surfaces of a cup member and a shaft member into abutment against each other and radiating a high energy intensity beam from a radially outer side, the shaft member has a recess on a radially inner side of the joining end surface to obtain a welded portion having a closed hollow cavity on a radially inner side after butt-welding. The joining end surface (protruding surface) of the cup member protrudes toward a radially inner side with respect to an inner diameter of the joining end surface of the shaft member. With this, a welded portion of an outer joint member of a constant velocity universal joint, which is manufactured by joining the cup member and the shaft member, can be improved in strength and quality. ## Claims ### Claim 1 A method of manufacturing an outer joint member of a constant velocity universal joint, the method comprising: bringing a solid shaft-shaped end portion of a cup member and a solid shaft-shaped end portion of a shaft member into abutment against each other; and radiating a high energy intensity beam from a radially outer side to perform butt welding, wherein the shaft member has a joining end surface and a recess formed on a radially inner side of the joining end surface of the shaft member, the cup member has a joining end surface protruding toward a radially inner side with respect to an inner diameter of the joining end surface of the shaft member and a protruding portion provided on a radially inner side with respect to the joining end surface of the cup member, the shaft member is formed by upset forging, the cup member is formed by forging, the joining end surface and the protruding portion of the cup member are formed by performing turning on only an annular region of an end surface of the cup member, and the butt welding is performed by bringing the joining end surface of the cup member and the joining end surface of the shaft member into abutment against each other. ### Claim 2 (depends on 1) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1, wherein the protruding portion has a diameter that is smaller than a diameter of the recess and has a height that is smaller than a depth of the recess. ### Claim 3 (depends on 1) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1, wherein the joining end surface of the shaft member is formed by cutting. ### Claim 4 (depends on 1) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1, wherein the recess of the shaft member is formed by forging. ### Claim 5 (depends on 2) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 2, wherein the joining end surface of the shaft member and an inner diameter portion of the joining end surface of the shaft member are subjected to cutting. ### Claim 6 (depends on 1) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1, wherein the protruding portion has a forged surface. ### Claim 7 (depends on 2) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 2, wherein the joining end surface of the shaft member is formed by cutting. ### Claim 8 (depends on 2) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 2, wherein the recess of the shaft member is formed by forging. ### Claim 9 (depends on 3) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 3, wherein the protruding portion has a forged surface. ### Claim 10 (depends on 4) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 4, wherein the protruding portion has a forged surface. ### Claim 11 (depends on 5) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 5, wherein the protruding portion has a forged surface. ### Claim 12 (depends on 8) The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 8, wherein the protruding portion has a forged surface.