US 2018/0016975 A1 · ACTUATOR OF VARIABLE COMPRESSION RATIO MECHANISM AND ACTUATOR OF LINK MECHANISM

Abstract

An actuator of a variable compression ratio mechanism includes: a control link; an arm link; a control shaft; a housing including a receiving portion in which a connection portion between the second end portion of the control link and the arm link is received, and a support hole formed within the housing, and rotatably supporting the control shaft; and a speed reduction device, the control shaft including a fixing portion inserted and fixed within the receiving portion in a fixing hole formed in the arm link at a predetermined axial position, and a first journal portion which is formed at a tip end portion of the control shaft, which has a diameter smaller than a diameter of the fixing portion, and which is supported by a first bearing hole formed in the support hole.

Claims4

Dependent claims

An actuator of a variable compression ratio mechanism arranged to vary at least one of an upper dead center position and a lower dead center position of a piston of an internal combustion engine, and to vary a mechanical compression ratio, the actuator comprising:

a drive motor;
a control shaft arranged to be rotated by the drive motor;
a member including a fixing hole to which the control shaft is fixed by a press-fit, the member being arranged to transmit a driving force of the control shaft to the variable compression ratio mechanism;
and
a housing including a receiving portion that receives a section in which the member is fixed to the control shaft, and that is opened in a radial direction of the control shaft, and a support hole that is opened to the receiving hole, and that rotatably supports the control shaft.

2 more elements

Dependencies are inferred from the claim text.

Actuator of variable compression ratio mechanism and actuator of link mechanism

Life of this patent

Actuator of variable compression ratio mechanism and actuator of link mechanism

Life of this patent

Abstract

Claims4