Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1997-04-18
1999-07-06
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
2988843, B23P 1500
Patent
active
059183675
ABSTRACT:
A method of producing a valve lifter to be used in a valve operating mechanism of an automotive vehicle. The valve lifter includes a skirt section, a crown section formed one end of the skirt section so that a cam of a camshaft is slidably contactable with the crown section, and a contacting section formed at an inside surface of the crown section and contactable with a valve stem of an engine valve. The production method comprises the following steps in the sequence set forth: (a) cold-forging a base material to form a valve lifter-shaped base material; (b) cold-pressing the base material to shape the valve lifter-shaped base material; (c) grinding an outer surface of the valve lifter-shaped base material to trim an outer shape of the valve-lifter-shaped base material; (d) totally machining the outer surface and an inner surface of the valve-shaped base material to adjust dimensions of parts of the valve lifter-shaped base material; (e) heat-treating only a part of the valve lifter-shaped base material, corresponding to the contacting section, to increase a hardness of the contacting section; and (f) grinding the contacting section to finish the contacting section.
REFERENCES:
patent: 1486927 (1924-09-01), Spire
patent: 2963011 (1960-12-01), Davis et al.
patent: 3090367 (1963-05-01), Ayres
patent: 3124869 (1964-03-01), Behnke et al.
patent: 5809644 (1998-09-01), Adachi
Fukuda Yasuo
Hosaka Noriomi
Koizumi Shin
Suzuki Kenji
Todo Tamotsu
Cuda Irene
Unisia Jecs Corporation
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