Internal-combustion engines – Valve – Reciprocating valve
Reexamination Certificate
2000-07-24
2001-10-30
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Valve
Reciprocating valve
C029S888450
Reexamination Certificate
active
06308675
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gas exchange valve with a hollow space and to a process for producing such a valve.
2. The Prior Art
A valve of this type is known from DE-PS 40 24 084. In connection with this valve, the bore of the hollow gas exchange valve is closed by means of application welding in that an additional powdery material is applied, for example by laser welding, or in that am MIG-welding method or a WIG-welding method with an additional wire is employed.
It has been found that particularly when the bore is sealed by means of laser powder application welding, the quality requirements applicable to high-quality engine components can be satisfied only by carrying out costly tests.
SUMMARY OF THE INVENTION
The invention is therefore dealing with the problem of sealing the opening of the cavity formed by the shaft and the disk or the base of the valve in a valve of the type specified above in such a way that an optimal welded zone is obtained.
The invention is based on the idea that if the extra mass of material required on the disk or base of the valve for the purpose of sealing the opening or bore of the valve is remelted, a superior welding quality will be obtained than when additional material in the form of powder or wire is added. The respective additional mass of material or the additional material accumulation is shaped within the zone of the valve disk by forging; on the base of the valve, it suffices if said base is extended by a few millimeters.
It is in fact known from
FIG. 11
of U.S. Pat. No. 2,411,734 to seal the bore of a gas exchange valve having a cavity without adding additional material. However, this is accomplished in this case by squeezing the walls of the bore together within the zone of the base of the valve, whereby extra mass is accordingly obtained radially.
REFERENCES:
patent: 2411734 (1946-11-01), Kerwin et al.
patent: 706 860 (1941-06-01), None
patent: 712 125 (1941-10-01), None
patent: 1 182 510 (1964-11-01), None
patent: 40 24 084 (1991-06-01), None
patent: 196 23 103 (1997-12-01), None
Natriumgekühlte Hohlventile . . . by Herbert Stein, MTZ Motorrechnische Zeitschrift, Year 22, Issued Sep. 1961, Franckh'sche Verlagshandlung Stuttgart.
Keller Peter
Mück Lothar
Collard & Roe P.C.
Kamen Noah P.
Mahle Ventilrieb GmbH
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