US 8,074,613 B2 · Variable compression ratio apparatus

Abstract

A variable compression ratio apparatus may include a connecting rod rotatably connected to the piston so as to receive the combustion force therefrom, a pin link mounted to the crankshaft and rotatably connected to the connecting rod so as to receive the combustion force from the connecting rod and rotate the crankshaft, a connecting link rotatably coupled to the pin link and changing a rotation trace of the pin link with respect to a rotation axis of the crankshaft, an eccentric camshaft provided with first and second shaft portions eccentric from each other and configured to rotate by a predetermined angle according to a driving condition of the engine, a sub control link rotatably connected to the eccentric camshaft about the first shaft portion and rotatably connected to the connecting link, and a main control link rotatably connected to the eccentric camshaft about the second shaft portion and rotatably connected to the connecting link.

Claims9

Dependent claims

A variable compression ratio apparatus that is mounted at an engine receiving a combustion force of an air-fuel mixture from a piston and rotating a crankshaft, and that changes compression ratio of the air-fuel mixture, comprising:

a connecting rod rotatably connected to the piston so as to receive the combustion force therefrom;
a pin link mounted to the crankshaft and rotatably connected to the connecting rod so as to receive the combustion force from the connecting rod and rotate the crankshaft;
a connecting link rotatably coupled to the pin link and changing a rotation trace of the pin link with respect to a rotation axis of the crankshaft;
an eccentric camshaft provided with first and second shaft portions eccentric from each other and configured to rotate by a predetermined angle according to a driving condition of the engine;
a sub control link rotatably connected to the eccentric camshaft about the first shaft portion and rotatably connected to the connecting link;
and
a main control link rotatably connected to the eccentric camshaft about the second shaft portion and rotatably connected to the connecting link.

4 more elements

a connecting rod having one end portion rotatably connected to the piston and the other end portion;
a pin link having a first connecting point rotatably connected to the other end portion of the connecting rod, a second connecting point rotatably connected to the crankshaft, and a third connecting point;
a connecting link having a fourth connecting point rotatably connected to the third connecting point of the pin link, and fifth and sixth connecting points;
a sub control link having one end portion rotatably connected to the sixth connecting point of the connecting link and the other end portion;
a main control link having one end portion rotatably connected to the fifth connecting point of the connecting link and the other end portion;
and
an eccentric camshaft rotatably connected respectively to the other end portions of the main control link and the sub control link, wherein rotation axes of the other end portions of the main control link and the sub control link are configured to be offset so as to change an angle between the main control link and the sub control link with respect to a rotation axis of the eccentric camshaft.

4 more elements

Dependencies are inferred from the claim text.

Variable compression ratio apparatus

Life of this patent

Variable compression ratio apparatus

Life of this patent

Abstract

Claims9