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MULTI-LINK VARIABLE COMPRESSION RATIO ENGINE

  • US 20090107454A1
  • Filed: 10/22/2008
  • Published: 04/30/2009
  • Est. Priority Date: 10/29/2007
  • Status: Active Grant
First Claim
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1. A multi-link variable compression ratio engine comprising:

  • a crankshaft;

    a piston operatively coupled to the crankshaft to move back and forth within a cylinder of the engine;

    a control shaft rotatably supported on the engine, the control shaft having an eccentric axle that is eccentric relative to a rotational center axis of the control shaft;

    a linkage operatively connecting the piston to the crankshaft and the crankshaft to the eccentric axle of the control shaft;

    a drive motor operatively coupled to the control shaft to rotate the control shaft about the rotational center axis such that a top dead center position of the piston is changed by turning the control shaft to vary a compression ratio of the engine by changing the position of the eccentric axle and the orientations of the linkage; and

    a reduction mechanism coupling the drive motor to the control shaft to reduce the rotation of the drive motor and transmit the rotation to the control shaft such that a reduction ratio of a rotation angle of the drive motor to a rotation angle of the control shaft is less at a high compression ratio than at an intermediate compression ratio.

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