Method of manufacturing outer races for tripod-type constant velocity universal joints

A method of manufacturing an outer race used in a constant velocity universal joint of a tripod type, said constant velocity universal joint comprising a cup body and a shaft extending axially outwardly from a bottom of the cup body in a direction opposite to an open end thereof, said cup body having an inner peripheral surface formed with three axially extending track grooves, said cup body further including a radially outwardly protruding wall portion, aligned with each of the track grooves, and a radially inwardly depressed wall portion aligned with a reduced diameter portion of a peripheral wall of the cup body between each of the track grooves, said protruding and depressed wall portions being so defined as to alternate with each other in a direction substantially circumferentially of the cup body, each of the reduced diameter portions of the peripheral wall of the cup body adjacent the open end of the latter having a chamfered portion defined at a peripheral lip region of the open end of the cup body,

• said method comprising:
• an upsetting operation to make a generally elongated intermediate member having a small diameter portion and a large diameter portion with an axially inwardly depressed recess defined in an end face of the large diameter portion remote from the small diameter portion, said recess having a tapered peripheral wall face, which defines a general shape of each of the chamfered portions;
• a cup forming operation performed subsequent to the upsetting operation, to shape the elongated intermediate member to a shape having the cup body by a combined pushing method including a forward pushing and a rearward container pushing;
• and
• a drawing operation to shape the cup body to a final design dimension and shape by a drawing technique.

A method, of manufacturing an outer race used in a constant velocity universal joint of a tripod type, said outer race including a cup body having an inner peripheral surface with axially extending track grooves, a radially outwardly protruding wall portion, aligned with each of the track grooves, and a radially inwardly depressed wall portion aligned with a reduced diameter portion of a peripheral wall of the cup body between each of the track grooves, the protruding and depressed wall portions being defined to alternate in a direction substantially circumferentially of the cup body, each of the reduced diameter portions of the peripheral wall of the cup body adjacent the open end of the latter having a chamfered portion defined at a peripheral lip region of an open end of the cup body, the method comprising:

• in an upsetting operation, forming a recess in an intermediate member, the recess having a tapered peripheral wall face, which defines a general shape of the chamfered portion;
• subsequent to the forming of the recess in the intermediate member, shaping the intermediate member to a shape having the cup body;
• and
• subsequent to the shaping of the intermediate member to the shape having the cup body, shaping the cup body to a final design dimension and shape by a drawing technique.

A method of manufacturing an outer race used in a constant velocity universal joint of a tripod type, the outer race including a cup body having a chamfered portion defined at a peripheral lip region of an open end of the cup body, and an axially extending track groove and reduced diameter portion, the method comprising:

• upsetting a recess in an end portion of an intermediate body, the recess defining a general shape of the chamfered portion;
• subsequent to the upsetting, in an operation shaping the intermediate body to a shape having the cup body, forming the track groove and reduced diameter portion while leaving the general shape of the chamfered portion untreated;
• and
• subsequent to the shaping of the intermediate body to the shape having the cup body, shaping the cup body to a final design dimension and shape by a drawing technique.

A method of manufacturing an outer race used in a constant velocity universal joint of a tripod type, the outer race including a cup body having a chamfered portion defined at a peripheral lip region of an open end of the cup body, and an axially extending track groove and reduced diameter portion, the method comprising:

• upsetting a recess in an end portion of an intermediate body to form a general shape of the chamfered portion, the recess having a peripheral wall that tapers from a mouth to an end surface;
• subsequent to the upsetting, in an operation shaping the intermediate body to a shape having the cup body, forming the track groove and reduced diameter portion in the end surface while leaving the tapered peripheral wall untreated;
• and
• subsequent to the shaping of the intermediate body to the shape having the cup body, shaping the cup body to a final design dimension and shape by a drawing technique.

A method of manufacturing an outer race used in a constant velocity universal joint of a tripod type, the outer race including a cup body having a chamfered portion defined at a peripheral lip region of an open end of the cup body, and an axially extending track groove and reduced diameter portion, the method comprising:

• upsetting a recess in an end portion of an intermediate body to form a general shape of the chamfered portion, the recess having a peripheral wall portion tapering from the end portion to a depth of the recess;
• subsequent to the upsetting, in an operation shaping the intermediate body to a shape having the cup body, forming the track groove and reduced diameter portion in the recess while leaving the tapered peripheral wall portion untreated;
• and
• subsequent to the shaping of the intermediate body to the shape having the cup body, shaping the cup body to a final design dimension and shape by a drawing technique.

A method of manufacturing an outer race used in a constant velocity universal joint of a tripod type, the outer race including a cup body having a chamfered portion defined at a peripheral lip region of an open end of the cup body, and a cup portion defining a closed end of the cup body, the method comprising:

• upsetting the chamfered portion in an end portion of an intermediate body to form a general shape of the chamfered portion;
• subsequent to the upsetting, forming the cup portion while leaving the general shape of the chamfered portion untreated;
• and
• subsequent to the forming of the cup portion, shaping the cup body to a final design dimension and shape by a drawing technique.