A method of manufacturing a constituent member of a constant-velocity joint includes: performing plastic working; and performing hardening of a material. The plastic working is performed with a material of the constituent member heated to a predetermined working temperature range. The hardening of the material is performed by utilizing heat applied for heating to the working temperature range in performing the plastic working as heat for the hardening of the material and cooling the material after performing the plastic working.

A method of manufacturing a constituent member of a constant-velocity joint includes: performing plastic working; and performing hardening of a material. The plastic working is performed with a material of the constituent member heated to a predetermined working temperature range. The hardening of the material is performed by utilizing heat applied for heating to the working temperature range in performing the plastic working as heat for the hardening of the material and cooling the material after performing the plastic working.

A flexible coupling assembly for a power transmission system including a first shaft defining an axis, configured for connecting to a first rotating member, the first shaft adjoining and passing through a first flexible diaphragm coupling and lockably connecting to a quill shaft by a locking flange and the quill shaft being configured for connecting to a second rotating member, including a first mating portion for receiving the locking flange of the first shaft within a circumferential opening, wherein the quill shaft is disposed within a primary diaphragm coupling shaft.

A flexible coupling assembly for a power transmission system including a first shaft defining an axis, configured for connecting to a first rotating member, the first shaft adjoining and passing through a first flexible diaphragm coupling and lockably connecting to a quill shaft by a locking flange and the quill shaft being configured for connecting to a second rotating member, including a first mating portion for receiving the locking flange of the first shaft within a circumferential opening, wherein the quill shaft is disposed within a primary diaphragm coupling shaft.

A method of manufacturing an outside joint member, the outside joint member including a cup portion in a bottomed tubular shape and a shaft portion that is a shaft-like portion extending from a bottom portion of the cup portion and that has a spline shaft having an outer peripheral surface on which spline teeth are formed, includes forging a forming material to form a shape of the cup portion and a shape of the spline shaft on the shaft portion simultaneously using a forging die.

A method of manufacturing a constituent member of a constant-velocity joint includes: performing plastic working; and performing hardening of a material. The plastic working is performed with a material of the constituent member heated to a predetermined working temperature range. The hardening of the material is performed by utilizing heat applied for heating to the working temperature range in performing the plastic working as heat for the hardening of the material and cooling the material after performing the plastic working.

A method of manufacturing a constituent member of a constant-velocity joint includes: performing plastic working; and performing hardening of a material. The plastic working is performed with a material of the constituent member heated to a predetermined working temperature range. The hardening of the material is performed by utilizing heat applied for heating to the working temperature range in performing the plastic working as heat for the hardening of the material and cooling the material after performing the plastic working.

A joint includes an outer race, a first inner race installed in the outer race and a second inner race installed in the first inner race. The outer race includes an inner surface and first grooves formed on the inner surface. The first inner race includes an outer surface, an inner surface and second grooves formed on the outer surface, and a plurality of third grooves formed on the inner surface. First balls are disposed between the first grooves and the second grooves for transmitting rotation of the first inner race to the outer race. The second inner race includes an outer surface and fourth grooves formed on the outer surface. Second balls disposed between the third grooves and the fourth grooves for transmitting rotation of the second inner race to the first inner race.

A homokinetic joint includes a joint socket shaft having a joint socket flange; a housing nut, which surrounds the joint socket shaft and has an internal thread; a joint head shaft, which has an external thread, wherein the external thread is of complementary design to the internal thread of the housing nut, wherein the joint socket shaft can be pivoted in a first pivoting direction and in a second pivoting direction relative to the joint head shaft; and a torsion disc between the joint socket shaft and the joint head shaft for transmitting torsional loads between the joint socket shaft and the joint head shaft; wherein a respective ball bearing is formed between the housing nut and the joint socket flange, between the joint socket flange and the torsion disc, and between the torsion disc and the joint head shaft.

A homokinetic joint includes a joint socket shaft having a joint socket flange; a housing nut, which surrounds the joint socket shaft and has an internal thread; a joint head shaft, which has an external thread, wherein the external thread is of complementary design to the internal thread of the housing nut, wherein the joint socket shaft can be pivoted in a first pivoting direction and in a second pivoting direction relative to the joint head shaft; and a torsion disc between the joint socket shaft and the joint head shaft for transmitting torsional loads between the joint socket shaft and the joint head shaft; wherein a respective ball bearing is formed between the housing nut and the joint socket flange, between the joint socket flange and the torsion disc, and between the torsion disc and the joint head shaft.