Piston—crankshaft connecting means for internal combustion engine

A piston-crankshaft connector for an internal combustion engine, consisting of:

• a crankpin nested, via a pair of pins of the crankpin, into counterweights associated with respective main journals, the crankpin and the main journals being equipped with the plurality of oil channels;
• a main connecting rod;
• at least one auxiliary connecting rod, each equipped with a segmented eccentric ring;
• and
• an upper crankpin, wherein
• the crankpin is further equipped with an axially positioned crankpin journal to which the main connecting rod is pivotably attached with a big end bore thereof, where the crankpin has one or more off-axial crankpin journals to which the at least one auxiliary connecting rod is pivotably fastened via a corresponding at least one bearing,
• the upper crankpin is nested within a small end bore formed in the main connecting rod and forms a sliding bearing with the small end bore, the upper crankpin is equipped with an off-center piston pin bore and at least one sliding pin which is positioned a predetermined distance from the upper crankpin rim to which the at least one auxiliary connecting rod is pivotally fastened, where the at least one auxiliary connecting rod continuously modifies a piston pin bore distance relative to a crankpin journal central axis during its rotation in each stroke of the internal combustion engine, and
• where the crankpin is further equipped with at least one delimiter formed as a tooth on at least one off-axial crankpin journal, where at least a pair of oil channels extend from a crankpin interior to an off-axial crankpin journal outer surface such that the pair of oil channels ends a predefined distance from the at least one delimiters, where the at least one delimiter is beneath a driving segment of the segmented eccentric ring which is composed from a C-shaped segment and the driving segment, where oil pressure exerted in one or more of the oil channels rotates the segmented eccentric ring over the corresponding off-axial crankpin journals and modifies the top dead center sliding pin position within the small end bore which simultaneously modifies the piston pin bore position within the main connecting rod and changes a compression ratio of the internal combustion engine.

A method for regulating compression ratio for an internal combustion engine using a piston-crankshaft connector, wherein the piston-crankshaft connector includes:

• a crankpin nested, via a pair of pins of the crankpin, into counterweights associated with respective main journals, the crankpin and the main journals being equipped with the plurality of oil channels,
• a main connecting rod,
• at least one auxiliary connecting rod, each equipped with a segmented eccentric ring, and
• an upper crankpin,
• wherein the crankpin is further equipped with an axially positioned crankpin journal to which the main connecting rod is pivotably attached with a big end bore thereof, where the crankpin has one or more off-axial crankpin journals to which the at least one auxiliary connecting rod is pivotably fastened via a corresponding at least one bearing,
• wherein the upper crankpin is nested within a small end bore formed in the main connecting rod and forms a sliding bearing with the small end bore, the upper crankpin is equipped with an off-center piston pin bore and at least one sliding pin which is positioned a predetermined distance from the upper crankpin rim to which the at least one auxiliary connecting rod is pivotally fastened, where the at least one auxiliary connecting rod continuously modifies a piston pin bore distance relative to a crankpin journal central axis during its rotation in each stroke of the internal combustion engine,
• wherein the crankpin is further equipped with at least one delimiter formed as a tooth on at least one off-axial crankpin journal, where at least a pair of oil channels extend from a crankpin interior to an off-axial crankpin journal outer surface such that the pair of oil channels ends a predefined distance from the at least one delimiter, where the at least one delimiter is beneath a driving segment of the segmented eccentric ring which is composed from a C-shaped segment and the driving segment, where oil pressure exerted in one or more of the oil channels rotates the segmented eccentric ring over the corresponding off-axial crankpin journals and modifies the top dead center sliding pin position within the small end bore which simultaneously modifies the piston pin bore position within the main connecting rod and changes a compression ratio of the internal combustion engine, and
• wherein the method comprises:
• pumping, using an oil pump, oil from an oil reservoir through one of two oil channels made through a crankshaft, where the channel pair extends through each of the main journals and each said crankpin forming two longitudinal channels, including a first longitudinal channel and a second longitudinal channel;
• transmitting the oil at pressure exerted by the pump by a first group of lateral oil channels connected to the first longitudinal channel or by a second group of lateral oil channels connected to the second longitudinal channel, each of the first and second groups of lateral oil channels ending on an off-axial crankpin surface within the predefined distance from the corresponding delimiter side, wherein each delimiter divides an expansion space formed beneath the driving segment;
• and
• after the transmitting, injecting oil into the expansion space, via one group of channels to rotate the entire segmented eccentric ring relative over the off-axial crankpin's outer surface in a desired direction to modify at least one top dead center sliding pin position within the small end bore and simultaneously modify the piston pin bore position within the main connecting rod and change the compression ratio of the internal combustion engine.