MULTI-LINK VARIABLE COMPRESSION RATIO ENGINE
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A multi-link variable compression ratio engine is provided with a crankshaft, a piston, a control shaft, a linkage, a motor and a reduction mechanism. The crankshaft moves the piston within an engine cylinder. The control shaft has an eccentric axle eccentric relative to its center-axis. The linkage operatively connects the piston to the crankshaft and the crankshaft to the eccentric axle of the control shaft. The motor rotates the control shaft so a top-dead-center position of the piston changes to vary compression ratios by changing the positions of the eccentric axle and the linkage. The reduction mechanism couples the motor to the control shaft to transmit a reduced rotation of the motor to the control shaft so a reduction ratio of a rotation angle of the motor to a rotation angle of the control shaft is less at high-compression ratios than at intermediate compression ratios.
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Citations
8 Claims
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1. A multi-link variable compression ratio engine comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification