Manufacturing method for rocker arm

Details Manufacturing method for rocker arm Manufacturing method for rocker arm

2006-08-01

2011-10-18

Banks, Derris H (Department: 3729)

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

C029S253000, C029S275000, C029S283500

Reexamination Certificate

active

08037601

ABSTRACT:
The present invention provides a rocker arm manufacturing method capable of stably forming valve stem guide walls. In the method according to the present invention, an intermediate product13having both side walls20extended in a predetermined direction and arranged in parallel with each other and a one end side connection wall30connecting lower ends of both the side walls20at a longitudinal one end of the product is obtained. Next, a first pressing punch70is pressed against the outer surface portions of both the side walls20from the outside thereof to cause downward plastic flows of regions of the outer surface portions of both the side walls positioned below the cutout portions31to thereby form raising walls32in a downwardly protruded manner at both sides of the one end side connection wall30. Thereafter, valve stem guide walls35are formed by pressing second pressing punches80against both the raising walls32of the one end side connection wall30.

REFERENCES:
patent: 6615635 (2003-09-01), Ammon
patent: 6889643 (2005-05-01), Motohashi
patent: 7062852 (2006-06-01), Shimizuya
patent: 7631425 (2009-12-01), Kamiji et al.
patent: 7788805 (2010-09-01), Kamiji
patent: 2004/0000278 (2004-01-01), Motohashi
patent: 2004/0261739 (2004-12-01), Shimizuya
patent: 2001-55913 (2001-02-01), None
patent: 2001-129633 (2001-05-01), None
patent: 2001-198641 (2001-07-01), None
patent: WO 2005/021183 (2005-03-01), None

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