Method for manufacturing outer joint member for constant velocity universal joint, shaft member and outer joint member

Patent metadata

Field	Value
Publication number	US-10514070-B2
Application number	US-201515318711-A
Country	US
Kind code	B2
Filing date	May 20, 2015
Priority date	Jun 16, 2014
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

A method of manufacturing an outer joint member of a constant velocity universal includes forming cup and shaft members of medium carbon steel, preparing, as the cup member, a cup member having cylindrical and bottom portions integrally formed by forging, and a joining end surface formed on an outer surface of the bottom portion after the forging, preparing, as the shaft member, a shaft member having a joining end surface to be joined to the bottom portion of the cup member, and bringing the joining end surfaces of the cup and shaft members into abutment against each other. The method also includes welding the cup and shaft members from an outer side of the cup member to an abutment portion between the cup and shaft members in a radial direction of the cup member.

First claim

The invention claimed is:

1. A method of manufacturing an outer joint member of a constant velocity universal joint, which is constructed by forming, through use of separate members, a cup section having track grooves formed at an inner periphery of the cup section and engageable with torque transmitting elements, and a shaft section formed at a bottom portion of the cup section, and by welding a cup member forming the cup section and a shaft member forming the shaft section,
the method comprising:
preparing the cup member of carbon steel, the preparing of the cup member including forging to integrally form a cylindrical portion and a bottom portion, and machining a joining end surface at an outer surface of the bottom portion after the forging;
preparing the shaft member of carbon steel, the preparing of the shaft member including a preforming step of forging a billet cut from a bar material to form a tapered shape at a portion of the billet, a main forming step of forging, at the portion of the billet having the tapered shape, a step portion and a radially inner side recessed portion at the step portion, and a machining step of machining a joining end surface at the step portion, the joining end surface of the shaft member to be joined to the bottom portion of the cup member;
bringing the joining end surface of the cup member and the joining end surface of the shaft member into abutment against each other;
welding the cup member and the shaft member by radiating a beam from an outer side of the cup member to an abutment portion between the cup member and the shaft member in a radial direction of the cup member; and
forming the outer joint member.

2. The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1 , wherein, in the preparing of the cup member, the machining comprises machining the joining end surface of the cup member with an outer diameter having a constant shape.

3. The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1 , wherein, in the preparing of the shaft member, a radio L 2 Dw 2 , where L 2 is an upset distance in the main forming step and Dw 2 is a diameter obtained by averaging a minimum diameter of the portion of the billet having the tapered shape and a maximum diameter of the portion of the billet having the tapered shape after the preforming step, is set to be smaller than a ratio of L 1 /Dw 1 , where L 1 is an upset distance in the preforming step and Dw 1 is an original diameter of the billet.

4. The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1 , wherein, in the prefroming step, the forging comprises using a punch having a conical angle (θ) of from 5° to 20° to form the tapered shape at the portion of the billet.

5. The method of manufacturing an outer joint member of a constant velocity universal joint according to claim 1 , wherein the preparing of the shaft member further includes heating the billet to from 800° C. to 1,000° C.

6. A method of manufacturing an outer joint member of a constant velocity universal joint, which is constructed by forming, through use of separate members, a cup section having track grooves formed at an inner periphery of the cup section and engageable with torque transmitting elements, and a shaft section formed at a bottom portion of the cup section, and by welding a cup member forming the cup section and a shaft member forming the shaft section,
the method comprising:
providing the cup;
preparing the shaft member of carbon steel, the preparing of the shaft member including a preforming step of forging a billet cut from a bar material to form a tapered shape at a portion of the billet, a main forming step of forging, at the portion of the billet having the tapered shape, a step portion and a radially inner side recessed portion at the step portion, and a machining step of machining a joining end surface at the step portion, the joining end surface of the shaft member to be joined to the cup member;
bringing a joining end surface of the cup member and the joining end surface of the shaft member into abutment against each other;
welding the cup member and the shaft member by radiating a beam from an outer side of the cup member to an abutment portion between the cup member and the shaft member in a radial direction of the cup member, and
forming the outer joint member.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• NATSUME Renji
• Harada Kuniaki
• Mano Yoshiya
• Suzuki Kiyohiro
• TSUBOI Shunichirou
• NAGATAKE Akira
• Sugiyama Tatsuro
• Kobayashi Masazumi

Classifications

• B21K1/763

  Inner elements of coupling members · CPC title

• B21J1/06

  Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations {(B21J5/063 takes precedence)} · CPC title

• F16D2003/22326

  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 · CPC title

• F16D1/027

  non-disconnectable, e.g. involving gluing, welding or the like · CPC title

• B21K1/14

  fittings · CPC title