Variable compression ratio device
AssigneeHyundai Motor Company
InventorEun Ho Lee
Life of this patent
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Abstract
A variable compression ratio device having a piston, a crankshaft, a connecting rod including a small end portion connected to the piston, may include a piston pin fixed to the connecting rod and fixed thereto, a receiving hole formed inside the piston and rotatably receiving the piston pin, wherein the receiving hole includes a convex portion and a concave portion, at least a variable pin slidably coupled to the piston pin and slidably coupled to the interior circumference of the receiving hole, wherein the at least a variable pin has a protrusion, and an oil supply passage selectively supplying oil to apply hydraulic pressure to the at least a variable pin, wherein the protrusion of the at least a variable pin is selectively coupled to the convex portion or the concave portion of the receiving hole.
Claims18
A variable compression ratio device having a piston, a crankshaft, a connecting rod including a small end portion rotatably connected to the piston and a large end portion rotatably connected to the crankshaft and converting reciprocative motion of the piston to rotary motion of the crankshaft, comprising:
- a piston pin that passes through the small end portion of the connecting rod and fixed thereto;
- a receiving hole formed inside the piston and rotatably receiving the piston pin therein, wherein the receiving hole includes a convex portion and a concave portion along an interior circumference thereof;
- at least a variable pin slidably coupled to an exterior circumference of the piston pin and slidably coupled to the interior circumference of the receiving hole, wherein the at least a variable pin has a protrusion at an exterior circumference thereof;
- and
- an oil supply passage selectively supplying oil to apply hydraulic pressure to the at least a variable pin so as to slidably move the at least a variable pin along the piston pin,
- wherein the protrusion of the at least a variable pin is selectively coupled to the convex portion or the concave portion of the receiving hole to change a distance between an upper surface of the piston and a center axis of the piston pin.
A variable compression ratio device having a piston, a crankshaft, a connecting rod including a small end portion rotatably connected to the piston and a large end portion rotatably connected to the crankshaft and converting reciprocative motion of the piston to rotary motion of the crankshaft, comprising:
- a piston pin that passes through the small end portion of the connecting rod and is fixed thereto;
- upper concave and convex portions and lower concave and convex portions formed inside the piston by turns so as to be symmetrical with respect to the small end portion;
- at least a variable pin that has an exterior circumference corresponding to the upper concave and convex portions and lower concave and convex portions, and is slidably coupled to an exterior circumference of the piston pin;
- an elastic member elastically supporting a flange integrally protruding outwardly from a radial direction of the at least a variable;
- an oil supply passage selectively pressurizing the flange against elastic force of the elastic member;
- and
- a sliding pin that is slidably coupled in the small end portion of the connecting rod and moved by a hydraulic pressure of the oil supply passage to pressurize a side of the flange in one direction,
- wherein the height of an upper surface of the piston is changed according to engagement or disengagement between an upper protrusion of the at least a variable pin and the upper concave or convex portion of the piston and between a lower protrusion of the at least a variable pin and the lower concave or convex portion of the piston.
Dependencies are inferred from the claim text.