Valve operating assembly and method of manufacturing

A process for manufacturing a valve operating assembly, comprising the steps of:

• a) cold forming, at least in part, a socket comprising the steps of:
• i) providing a first rod;
• ii) cold forming, at least in part, a first socket surface into the first rod so that the first socket surface includes a push rod cooperating surface;
• iii) cold forming, at least in part, a second socket surface into the first rod so that the second socket surface includes a protruding surface, a first flat surface, and a second flat surface, wherein the protruding surface is located between the first flat surface and the second flat surface;
• b) cold forming, at least in part, a leakdown plunger, comprising the steps of:
• i) providing a second rod;
• ii) cold forming, at least in part, a first plunger opening into the second rod so that the first plunger opening is provided with an annular plunger surface that defines a plunger hole shaped to accommodate a generally spherical member;
• iii) cold forming, at least in part, a second plunger opening into the second rod;
• c) cold forming, at least in part, a roller follower body that is provided with an axis comprising the steps of:
• i) providing a third rod;
• ii) cold forming a first roller cavity into the third rod so that the third rod is provided with a first roller opening and a first inner roller surface that includes a first wall, a second wall, a third wall, and a fourth wall that extend from the first roller opening into the third rod with the fourth wall being located adjacent to a first curved surface, the third wall being located adjacent to a second curved surface;
• iii) cold forming, at least in part, a second roller cavity into the third rod so that the second roller cavity is provided with a second roller opening and a second inner roller surface that includes a generally cylindrical surface;
• iv) fabricating a transition that links the first and second roller cavities so that the first and second curved surfaces are located adjacent to the transition;
• d) cold forming, at least in part, a lash adjuster body for insertion into the second roller cavity of the roller follower body, including the steps of:
• i) providing a fourth rod;
• and
• ii) cold forming, at least in part, a lash adjuster cavity into the fourth rod so that the fourth rod is provided with an inner lash adjuster surface.

A process for manufacturing a valve operating assembly, comprising the steps of:

• a) cold forming, at least in part, a socket comprising the steps of:
• i) providing a first rod;
• ii) cold forming, at least in part, a first socket surface into the first rod so that the first socket surface includes a push rod cooperating surface;
• iii) cold forming, at least in part, a second socket surface into the first rod so that the second socket surface includes a protruding surface, a first flat surface, and a second flat surface, wherein the protruding surface is located between the first flat surface and the second flat surface;
• b) cold forming, at least in part, a leakdown plunger, comprising the steps of:
• i) providing a second rod;
• ii) cold forming, at least in part, a first plunger opening into the second rod so that the first plunger opening is provided with an annular plunger surface that defines a plunger hole shaped to accommodate a generally spherical member;
• iii) cold forming a second plunger opening into the second rod;
• c) cold forming, at least in part, a valve lifter body that is provided with a valve lifter axis, comprising the steps of:
• i) providing a third rod;
• ii) cold forming a first lifter cavity into the third rod so that the third rod is provided with a first lifter opening and a first wall, a second wall, a third wall, a fourth wall, a first angled wall, a second angled wall, a third angled wall, and a fourth angled wall that extend from the first lifter opening into the third rod with the fourth wall being located adjacent to a first curved surface, the third wall being located adjacent to a second curved surface;
• and
• iii) cold forming, at least in part, a second lifter cavity into the third rod so that the second lifter cavity is provided with a second inner lifter surface that includes a generally cylindrical surface.