Piston actuation system of V-type engine with variable compression ratio mechanism
AssigneeNissan Motor Co., Ltd.
InventorsShunichi Aoyama, Katsuya Moteki, Hiroya Fujimoto
Life of this patent
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Abstract
In a piston actuation system of a V-type internal combustion engine with two cylinder banks having at least one pair of cylinders, a piston pin, an upper link, a lower link, and a control link are mechanically linked to each other for each cylinder bank. When changing a compression ratio of the engine, ends of the control links of the two cylinder banks are moved in synchronism. The lower links of the two cylinder banks are coaxially rotatably fitted on the outer periphery of the same crankpin whose axis is eccentric to the axis of the crankshaft.
Claims10
A piston actuation system of a V-type internal combustion engine with a crankshaft and two cylinder banks having at least one pair of cylinders whose centerlines are set at a predetermined bank angle to each other, a pair of pistons slidably disposed in the respective cylinders, comprising:
- a pair of upper links connected to piston pins of the pistons so as to be rotatable relative to the respective piston pins;
- a pair of lower links connected to the upper links so as to be rotatable relative to the respective upper links;
- a pair of control links connected at their first ends to the lower links so as to be rotatable relative to the respective lower links;
- a control mechanism that is connected to the second end of each of the control links to move the second end of each of the control links relative to a body of the engine when changing a compression ratio of the engine;
- and
- a crankpin whose axis is eccentric to an axis of the crankshaft and on which a first one of the pair of lower links is rotatably fitted and a crankpin whose axis is eccentric to the axis of the crankshaft and on which the second lower link is rotatably fitted, being coaxially arranged with each other.
A piston actuation system of a V-type internal combustion engine with a crankshaft and two cylinder banks having at least one pair of cylinders whose centerlines are set at a predetermined bank angle to each other, a pair of pistons slidably disposed in the respective cylinders, comprising:
- a pair of upper links connected to piston pins of the pistons so as to be rotatable relative to the respective piston pins;
- a pair of lower links connected to the upper links so as to be rotatable relative to the respective upper links;
- a pair of control links connected at their first ends to the lower links so as to be rotatable relative to the respective lower links;
- a control mechanism that is connected to the other end of each of the control links to move the second end of each of the control links relative to a body of the engine when changing a compression ratio of the engine;
- and
- the pair of lower links being fitted on an outer periphery of the same crankpin whose axis is eccentric to an axis of the crankshaft.
A piston actuation system of a V-type internal combustion engine with a crankshaft and two cylinder banks having at least one pair of cylinders whose centerlines are set at a predetermined bank angle to each other, a pair of pistons slidably disposed in the respective cylinders, comprising:
- a pair of upper links connected to piston pins of the pistons so as to be rotatable relative to the respective piston pins;
- a pair of lower links connected to the upper links so as to be rotatable relative to the respective upper links;
- a pair of control links connected at their first ends to the lower links so as to be rotatable relative to the respective lower links;
- compression ratio control means that is connected to the second end of each of the control links to move the second end of each of the control links relative to a body of the engine when changing a compression ratio of the engine;
- and
- a crankpin whose axis is eccentric to an axis of the crankshaft and on which a first one of the pair of lower links is rotatably fitted and a crankpin whose axis is eccentric to the axis of the crankshaft and on which the second lower link is rotatably fitted, being coaxially arranged with each other.
Dependencies are inferred from the claim text.