Internal combustion engine with multi-joint crank drive and additional mass on the articulated linkage of the multi-joint crank drive for damping free inertial forces

Abstract

An internal combustion engine has a multi-joint crank drive which includes a plurality of coupling members rotatably mounted on a crankshaft and a plurality of articulated connecting rods rotatably mounted on an eccentric shaft, wherein each of the coupling members is pivotably connected to a piston connecting rod of a piston of the internal combustion engine and to one of the articulated connecting rods. In order that the second-order mass forces can be better compensated without a considerable increase in the friction losses, the required packaging space, the weight of the multi-joint crank drive, or the bearing forces in the bearings of the crankshaft, the articulated connecting rods are provided with additional masses and have a center of mass that lies outside the longitudinal center planes of the articulated connecting rods.

Description

technical field [0001] The invention relates to an internal combustion engine. Background technique [0002] Internal combustion engines of this type are already known, for example, from DE-A-102005054761, DE-A-102005054760, EP-A-1126144, JP-A-2004124775 or WO-A-2007057149 and are generally referred to as having variable compression ratio or indeterminate Compression ratio internal combustion engine, because the compression ratio can be changed by twisting the eccentric shaft. [0003] In such an internal combustion engine, the multi-joint crank drive comprises, in addition to the eccentric shaft, a number corresponding to the number of cylinders, each of which is mounted rotatably on a reciprocating journal of the crankshaft and has two The opposite sides protrude beyond the arms of the crankshaft, each end of which is provided with an arm of a pivot joint. One of the pivot joints is used to articulate the piston connecting rod, which connects one of the pistons of the in...

AI Technical Summary

Problems solved by technology

However, this measure cannot be transferred without problems to an internal combustion engine with a multi-joint crank drive, since the inertial forces generated there on the one hand do not extend purely vibrating but rotationally, and on the other hand the friction of the multi-joint crank drive The losses themselves are already higher than the friction losses of conventional internal combustion engines and can be increased to unacceptable levels by the additional friction losses of the two balance shafts

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