Measuring and testing – Test stand – For engine
Patent
1996-01-25
1997-10-07
Dombroske, George M.
Measuring and testing
Test stand
For engine
324378, 33605, G01M 1500, G01M 1300, G01B 716
Patent
active
056750765
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
For the operation and service life of the frictional system consisting of a piston/piston rings/cylinder sleeve assembly, a circular cylinder tube is ideal. Apart from manufacturing inaccuracies, particularly thermal and mechanical stresses which affect the cylinder tube lead to deviations of the cylinder tube from its ideal geometry. The mechanical stresses are derived from clamping forces generated due to the mounting of the cylinder head and cylinder head gaskets. The thermal stresses are generated by the different heat expansion of interconnected engine components, particularly the crank case and the cylinder head, by temperature gradients during operation as well as by the gas pressure during operation. Because of these deformations which represent a departure from the ideal geometry of the cylinder tube, the oil consumption, the blow-through and wear behavior and, because of the increased friction, also the fuel consumption are affected.
In the initial development of an engine it is sought to largely eliminate these different influencing factors by structural measures, in order to be able to maintain, to the extent possible, the ideal geometry of the cylinder tube even during operation.
It has been attempted to detect cylinder deformations of this type. Relevant publications in this connection are as follows:
K. Lonne: The Cylinder Deformation Measuring System According to Goetze and Possibilities for Reducing the Cylinder Deformations (original title: Das Goetze Zylinderverzugsme.beta.system und Moglichkeiten zur Reduzierung der Zylinderverzuge); Technical Bulletin D11, published by Goetze AG, Burscheid, Germany;
P. Johren: Device for Determining Cylinder Deformations and Their Causes (original title: Einrichtung zur Ermittlung yon Zylinderverzugen und Ihren Ursachen); Technical Bulletin K11, published by Goetze AG, Burscheid, Germany; and
F. Stecher: Cylinder Deformations--Tests in a Model Construction and in a Running Engine (original title: Zylinderverformungen--Untersuchungen in einer Modellanlage und im laufenden Motor); MTZ Motortechnische Zeitschrift, Volume 31, No. 12, 1970, Suttgart, Germany.
Thus, for example, in the publications by K. Lonne and P. Johren a process is described in which measurements of cylinder deformations were performed statically, so that only structure-caused stress conditions could be simulated. The effects by engine operation are missing, so that the stress conditions resulting therefrom cannot be detected at all, since differences in the component temperatures caused by the combustion process and additional mechanical stresses caused by gas forces during engine operation cannot be detected.
In the publication by Stecher a process is described which, to be sure, permits measuring during operation, but only at low rpm's. Further, the measuring process is not contactless, so that significant interfering effects may occur.
SUMMARY OF THE INVENTION
It is thus the object of the invention to provide a device for measuring the cylinder deformation in piston-type internal-combustion engines which makes it possible to detect cylinder deformations under static stress as well as under operational stress, that is, while the engine is running.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which briefly stated, the piston-type internal combustion engine includes an engine cylinder; a piston slidably received in the engine cylinder; and a device, carried by the piston, for measuring deformations in the cylinder wall. The piston has at least two radial bores. The measuring device includes a separate carrier element disposed in each radial bore. The carrier elements are attached to the piston in a region of the piston axis such as to be displaceable relative to the radial bores, whereby a relative motion between the piston and each carrier element is provided upon radial expansion and contraction of the piston. The measuring device further includes a separate, electrically ind
REFERENCES:
patent: 4672843 (1987-06-01), Pozniak
F. Stecher: "Zylinderverformungen-Untersuchungen in einer Modellanlage und im laufenden Motor". In: MTZ Motortechnische Zeitschrift, vol. 31, No. 12, 1970, Stuttgart, Germany, pp. 505-511.
Esch Thomas
Haas Albert
Koch Franz
Orgrzewalla Juergen
Dombroske George M.
FEV Motorentechnik GmbH & Co. Kommanditgesellschaft
LandOfFree
Device for measuring cylinder deformations in piston-type intern does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for measuring cylinder deformations in piston-type intern, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for measuring cylinder deformations in piston-type intern will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2358982