Abstract: Provided is an actuator for a variable compression ratio mechanism of an internal combustion engine, which improves productivity.

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.

Abstract: Provided is an actuator for a link mechanism for an internal combustion engine, which is capable of enhancing the durability of a wave gear type speed reducer or a bearing portion. The actuator for a link mechanism for an internal combustion engine according to the present invention includes: a housing including a bearing portion configured to support a control shaft so that the control shaft is rotatable; and the wave gear type speed reducer configured to reduce a rotation speed of an output shaft connected to a drive motor, and to transmit the reduced rotation speed to the control shaft. A restricting mechanism is provided to one of the control shaft and the housing, and is configured to restrict movement of the control shaft toward the wave gear type speed reducer side in an axial direction by being brought into contact with another of the control shaft and the housing.

Abstract: An actuator of a variable compression ratio mechanism for an internal combustion engine includes an arm link 13 configured to change a posture of the variable compression ratio mechanism for the internal combustion engine by swinging, a second control shaft 11 fixed to the arm link 13, and a housing 20 including a first bearing hole 301a supporting the second control shaft 11. The housing 20 includes a lubricant oil supply oil passage 202 opened to a pressure-receiving range over which a contact pressure is received at the first bearing hole 301a from the second control shaft 11 during an expansion stroke of the internal combustion engine.

Abstract: Provided is an actuator for a link mechanism for an internal combustion engine, which can be prevented from being increased in size in an axial direction. The actuator for a link mechanism for an internal combustion engine of the present invention includes: a wave gear type speed reducer configured to reduce a rotation speed of an electric motor, and to transmit the rotation speed to the control shaft; and a housing to which the electric motor and the wave gear type speed reducer are fixed, the wave gear type speed reducer including: an inner gear, which is fixed to the housing, has inner teeth meshed with the flexible outer gear, and is made of an iron-based metal material, the actuator including a stopper mechanism, which is provided to each of the inner gear and the control shaft, and is configured to restrict relative rotation of a predetermined amount or more when the inner gear and the control shaft are held in abutment against each other.

Abstract: Provided is an actuator of a link mechanism for an internal combustion engine, in which a speed reducer is sufficiently lubricated. The actuator includes an oil passage formed in a control shaft for changing the posture of a control link and configured to feed lubricant oil to the speed reducer; and an open portion which opens to face the speed reducer in one end side located on the speed reducer side, and which is in communication with the oil passage in the other end side. An inner diameter of the one end side of the open portion is larger than an outer diameter of one end side of the oil passage.

Abstract: A variable compression ratio mechanism for an internal combustion engine includes a gear reducer that varies an engine compression ratio. The gear reducer includes an input-side member connected to a rotation shaft of the actuator; an output-side member that transmits a reduced rotation of the actuator to the control shaft; a fixed member fixed to a housing of the actuator; and an intermediate member that transmits torque from the input-side member to the output-side member and the fixed member, and has a first gear portion engaged with the fixed member and a second gear portion engaged with the output-side member. A ratio of a number of teeth of the fixed gear portion to a number of teeth of the first gear portion is higher than a ratio of a number of teeth of the output-side gear portion to a number of teeth of the second gear portion.

Abstract: The control shaft (20) of a variable compression ratio mechanism is coordinated with the auxiliary shaft (25) of an actuator device (1) through an intermediate link (31). The housing (5) of the actuator device (1) has on the lower surface thereof an oil filter mounting seat section (36), and a stopper section (37) is formed integrally with the oil filter mounting seat section (36). A second arm (28) of the auxiliary shaft (25) comes in contact with the stopper section (37) to define the limit of the compression ratio on the low compression ratio side. The stopper section (37) has high rigidity because the oil filter mounting seat section (36) having high rigidity and the stopper section (37) are integrated together.

Abstract: A variable compression ratio mechanism for an internal combustion engine includes a gear reducer that varies an engine compression ratio. The gear reducer includes an input-side member connected to a rotation shaft of an actuator; an output-side member that transmits a reduced rotation of the actuator to the control shaft; a fixed member fixed to a housing of the actuator; and an intermediate member that transmits torque from the input-side member to the output-side member and the fixed member, and has a first gear portion engaged with the fixed member and a second gear portion engaged with the output-side member. A ratio of a number of teeth of the fixed gear portion to a number of teeth of the first gear portion is lower than a ratio of a number of teeth of the output-side gear portion to a number of teeth of the second gear portion.

Abstract: An object of the present invention is to provide an actuator of a link mechanism for an internal combustion engine capable of ensuring lubricity regardless of a slope of a road surface. An actuator of a link mechanism for an internal combustion engine according to one aspect of the present invention includes a ball bearing having an inner race held by a wave generator of a strain wave gearing speed reducer and an outer race held by a housing, and a holding mechanism capable of holding lubricant oil on a radially inner side with respect to the outer race of this roller bearing.

Abstract: Provided is an actuator for a link mechanism for an internal combustion engine, which is capable of improving a degree of freedom in layout while reducing the number of components. The actuator for a link mechanism for an internal combustion engine according to the present invention includes a rolling bearing provided between a wave generator of a wave gear speed reducer and a housing or a motor housing. An inner ring of the rolling bearing is fixed to the wave generator. A restricting portion configured to restrict movement of an outer ring of the rolling bearing to both sides in an axial direction with respect to the housing or the motor housing is provided.

Abstract: Provided is an actuator for a link mechanism for an internal combustion engine, which is capable of enhancing the durability of a wave gear type speed reducer or a bearing portion. The actuator for a link mechanism for an internal combustion engine according to the present invention includes: a housing including a bearing portion configured to support a control shaft so that the control shaft is rotatable; and the wave gear type speed reducer configured to reduce a rotation speed of an output shaft connected to a drive motor, and to transmit the reduced rotation speed to the control shaft. A restricting mechanism is provided to one of the control shaft and the housing, and is configured to restrict movement of the control shaft toward the wave gear type speed reducer side in an axial direction by being brought into contact with another of the control shaft and the housing.

Abstract: Provided is an actuator for a link mechanism for an internal combustion engine, which can be prevented from being increased in size in an axial direction. The actuator for a link mechanism for an internal combustion engine of the present invention includes: a wave gear type speed reducer configured to reduce a rotation speed of an electric motor, and to transmit the rotation speed to the control shaft; and a housing to which the electric motor and the wave gear type speed reducer are fixed, the wave gear type speed reducer including: an inner gear, which is fixed to the housing, has inner teeth meshed with the flexible outer gear, and is made of an iron-based metal material, the actuator including a stopper mechanism, which is provided to each of the inner gear and the control shaft, and is configured to restrict relative rotation of a predetermined amount or more when the inner gear and the control shaft are held in abutment against each other.

Abstract: Disclosed is an actuator for a link mechanism of an internal combustion mechanism, which includes: a control link (12); an arm link (13) pivotably connected to the other end of the control link; a control shaft (11) to which the arm link is fixed by press-fitting; a housing body (28) having a support hole (30) formed to rotatably support therein the control shaft and an accommodation room (28b) formed in a direction intersecting an center axis of the support hole to accommodate therein the connection site between the arm link and the control link. The housing body further has through holes formed therethrough from an outer surface of the housing body to the accommodation room in an axial direction of the control shaft such that insertion support parts (72 to 74) of a support jig (70) can be inserted through and removed from the respective through holes.

Abstract: The control shaft (20) of a variable compression ratio mechanism is coordinated with the auxiliary shaft (25) of an actuator device (1) through an intermediate link (31). The housing (5) of the actuator device (1) has on the lower surface thereof an oil filter mounting seat section (36), and a stopper section (37) is formed integrally with the oil filter mounting seat section (36). A second arm (28) of the auxiliary shaft (25) comes in contact with the stopper section (37) to define the limit of the compression ratio on the low compression ratio side. The stopper section (37) has high rigidity because the oil filter mounting seat section (36) having high rigidity and the stopper section (37) are integrated together.

Abstract: Provided is an actuator of a link mechanism for an internal combustion engine, in which a speed reducer is sufficiently lubricated. The actuator includes an oil passage formed in a control shaft for changing the posture of a control link and configured to feed lubricant oil to the speed reducer; and an open portion which opens to face the speed reducer in one end side located on the speed reducer side, and which is in communication with the oil passage in the other end side. An inner diameter of the one end side of the open portion is larger than an outer diameter of one end side of the oil passage.

Abstract: Disclosed is a variable compression ration mechanism in which a control shaft is rotated and driven by an electric motor through a wave gear reducer. The wave gear reducer includes: a first internal gear member; an external gear member arranged concentrically inside the internal gear member; a wave generator arranged inside the external gear member; and a second internal gear member, wherein a ratio of the number of teeth of a fixed gear portion of the first internal gear member to the number of teeth of a first gear portion of the external gear member is set lower than a ratio of the number of teeth of an output-side gear portion of the second internal gear member to the number of teeth of a second gear portion of the external gear member.

Abstract: Disclosed is a variable compression ration mechanism in which a control shaft is rotated and driven by an electric motor through a wave gear reducer. The wave gear reducer includes: a first internal gear member; an external gear member arranged concentrically inside the internal gear member; a wave generator having an oval outer shape and arranged inside the external gear member; and a second internal gear member, wherein a ratio of the number of teeth of a fixed gear portion of the first internal gear member to the number of teeth of a first gear portion of the external gear member is set greater than a ratio of the number of teeth of an output-side gear portion of the second internal gear member to the number of teeth of a second gear portion of the external gear member.

Abstract: Provided is an actuator for a link mechanism for an internal combustion engine, which is capable of improving a degree of freedom in layout while reducing the number of components. The actuator for a link mechanism for an internal combustion engine according to the present invention includes a rolling bearing provided between a wave generator of a wave gear speed reducer and a housing or a motor housing. An inner ring of the rolling bearing is fixed to the wave generator. A restricting portion configured to restrict movement of an outer ring of the rolling bearing to both sides in an axial direction with respect to the housing or the motor housing is provided.

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.