Internal-combustion engines – Vibration compensating device – Balancing arrangement
Patent
1992-03-21
1993-07-27
Kamen, Noah P.
Internal-combustion engines
Vibration compensating device
Balancing arrangement
74603, F02B 2506
Patent
active
052303110
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a mass compensator for an internal combustion piston engine with three cylinder banks offset relative to one another, each bank having four cylinders and one common crankshaft with four crank pins on which one piston-connecting rod unit of each cylinder bank acts.
Internal combustion piston engines of this design are known as W-type engines. The preferred cylinder angel is 60 degrees to one yields a spread of the outside cylinder banks of 120 degrees to one another. If an internal combustion engine of this type is to be installed in a motor vehicle, the installation spaces are very cramped and they must be taken into account in the engineering of the internal combustion engine, for example, also in mass compensation. Problems arise especially for balancing of mass forces and moments of the 2nd order if these forces and moments are to be balanced by compensating shafts driven in opposite directions with twice the engine rpm.
SUMMARY OF THE INVENTION
The object of the invention is to provide a mass compensator with compensating shafts in an internal combustion engine of the generic type; at relatively low construction cost the compensator enables reliable balancing of free mass forces and moments, especially of the second order.
As was recognized by the inventors, in the generic W-engine the free mass forces and moments, especially of the second order, can suffice with only two compensating shafts driven in opposite directions and at twice the engine rpm, these shafts with correspondingly matched balancing weights, when their arrangement satisfies the relation disclosed herein.
With consideration of these constraints, a preferred spatial arrangement can be structurally implemented in an especially favorable manner on the internal combustion engine. Thus, the compensating shafts which lie relatively close to one another in space can be driven via a belt drive or chain drive with little noise and vibration. In addition there remains sufficient installation space for the drives and assemblies necessary and conventional on internal engines, such as camshafts, fan drive, generator, steering pump, etc.
The advantages of the present invention will become more apparent to those persons having ordinary skill in the art to which the present invention pertains from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1-8 show the theoretical relationships of the mass compensator as per the invention according to the principle of the vector addition method.
FIG. 9 shows the theoretical arrangement of the compensating shafts according to the relation defined in patent claim 1; and
FIG. 10 shows the cylinder crankcase of a W12 internal combustion piston engine with two compensating shafts arranged on one side.
FIG. 11 shows an arrangement of compensating shafts directly in the cylinder crankcase of an internal combustion engine as per FIG. 10, in a section according to line XI--XI of FIG. 12, and
FIG. 12 shows a longitudinal section according to line XII--XII of FIG. 11 through the compensating shaft with bearing caps, the shaft being located laterally on cylinder side III.
DETAILED DESCRIPTION
The mass forces F.sub.o (.phi.) of order i which oscillate along one cylinder axis can be represented by two vectors rotating in opposite direction with i.times..omega. revolutions per minute. Vectors rotating both positively and negatively are thus mirror inverted to the cylinder axis. At any time (.notlessthan..phi.=.omega.t) the horizontal vector components cancel out and the vertical components add up to F.sub.o -A .omega..sup.2 cos(i.phi.); for the second engine configuration A=.lambda.m.sub.o r.
In engines with several cylinder banks the sums are formed from the positively and negatively rotating vectors of the other cylinder banks.
In FIG. 1 the three cylinder banks I, II and III of a W12 internal combustion piston engine are plotted in broken lines, for which a cranked portion of the shaft accordi
REFERENCES:
patent: 2182988 (1939-12-01), Iseler
patent: 3800625 (1974-04-01), Seino et al.
patent: 4683849 (1987-08-01), Brown
Kuhn Michael
Schindler Manfred
Stemmer Xaver
Vilsmeier Walter
Audi AG
Kamen Noah P.
LandOfFree
Mass compensator for an internal combustion piston engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mass compensator for an internal combustion piston engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass compensator for an internal combustion piston engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2337355