Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate
2001-03-23
2002-12-03
Cuda-Rosenbaum, I. (Department: 3726)
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
C029S888042, C029S888049, C029S557000
Reexamination Certificate
active
06487773
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method of producing a one-piece piston having a cooling duct.
2. The Prior Art
Such a piston, which is manufactured from steel by casting, is known from practical operation. To obtain a closed cooling duct, releasable casting cores have to be used, which complicate the production process and make it expensive.
A one-piece cooling duct piston is also known from U.S. Pat. No. 4,608,947. However, this reference does not teach anything regarding the method of producing such a piston.
SUMMARY OF THE INVENTION
The present invention deals with the problem of producing a one-piece piston having a closed cooling duct in a constructionally simple way.
This problem is solved with a method for producing a one-piece piston having a closed cooling duct annularly extending in the piston crown at the level of the piston ring band, and an annular recess between the piston ring band and the box-shaped piston skirt. The piston skirt is connected with the piston bosses suspended on the piston crown and to a radially inner region below the crown. The method comprises forging a piston blank, machining an annular recess between the piston ring band and the box-shaped piston skirt, with the depth of the recess being machined so that the upper end of the skirt remains connected to the radially inner region below the crown, machining a downwardly-open cooling duct, producing boss bores and finishing the outer contour of the piston, and closing the downwardly-open cooling duct with a cover ring.
In regard to the state of the art, the design of a jointed piston (articulated piston) needs to be mentioned as well, where the crown of the piston is connected with the piston pin separately from the piston skirt only via the pin (see, for example, DE-OS 36 43 039). With such a jointed piston, there is a cooling duct in the crown of the piston that is open at the bottom, such duct being closed with a divided sheet metal ring. The manufacture of such a cooling duct is possible only by dividing the piston in two parts, which, however, leads to increased expenditure in the manufacture of the jointed piston because the piston skirt has to be additionally machined separately. In addition, as compared to the one-piece piston according to the invention, such a jointed piston requires a longer piston pin, which increases the weight.
A method of producing a one-part cooling duct piston is disclosed in U.S. Pat. No. 5,778,533, the disclosure of which is incorporated by reference. The present invention improves on this patent by machining the annular recess so that the upper end of the piston skirt remains connected to the radially inner region below the crown. The connection can extend all around, or could be strut-like and only be in selected locations.
The present invention is an improvement over the previous one-piece piston because it is a stronger design and has correspondingly higher safety margins in highly stressed areas. In addition, the piston secondary motion is reduced because of the stiffer design, which results in less ring motion, which reduces wear and lessens oil requirements, and has a reduced risk of cavitation. Furthermore, the improved design makes the distribution of side load more even, contributing to less cylinder liner wear. Finally, the piston of the present invention is easier to machine. It allows for a turning operation with fewer interruptions, and requires no deburring action. In certain cases, the stiffness of the skirt is sufficient to guide the piston only in the skirt section. Guidance in the ring band area could be eliminated, if desired.
REFERENCES:
patent: 3654840 (1972-04-01), Elliott
patent: 4125926 (1978-11-01), Gale et al.
patent: 4364159 (1982-12-01), Holcombe
patent: 4365399 (1982-12-01), Mahrus
patent: 4463590 (1984-08-01), Theobald
patent: 4608947 (1986-09-01), Stadler
patent: 4847964 (1989-07-01), Yarnell
patent: 4887449 (1989-12-01), Kanai et al.
patent: 5150517 (1992-09-01), Martins Leites et al.
patent: 5230148 (1993-07-01), Martins Leites et al.
patent: 5778533 (1998-07-01), Kemnitz
patent: 5992015 (1999-11-01), Kurita et al.
patent: 6070323 (2000-06-01), Koike et al.
patent: 6363608 (2002-04-01), Koike et al.
patent: 36 43 039 (1988-06-01), None
Danner Jochen Ernst
Scharp Rainer
Collard & Roe P.C.
Cuda-Rosenbaum I.
Mahle GmbH
LandOfFree
Method of making one-piece piston does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making one-piece piston, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making one-piece piston will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2974836