Hitachi Automotive Systems, Ltd.

Nissan Motor Company Limited

Harmonic Drive Systems Inc.

Unisia Jecs Corporation

Junichiro Onigata

Kishiro Nagai

Yoshihiko Yamada

Yoshiaki Tanaka

Ryosuke Hiyoshi

Yoshihide Kiyosawa

Jun Handa

Shingo Murakami

Kotofumi Yanai

Yoshihiro Suda

Kazuyoshi Kushihara

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.

Actuator of variable compression ratio mechanism and actuator of link mechanism

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.

Link mechanism actuator for internal combustion engine

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.

Actuator for link mechanism for internal combustion engine

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

Actuator device for variable compression ratio internal combustion engine

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.

Variable compression ratio mechanism for internal combustion engine

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.

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.

Disclosed is an actuator for a link mechanism of an internal combustion mechanism, which includes: a control link (); an arm link () pivotably connected to the other end of the control link; a control shaft () to which the arm link is fixed by press-fitting; a housing body () having a support hole () formed to rotatably support therein the control shaft and an accommodation room () 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 (to) of a support jig () can be inserted through and removed from the respective through holes.

Actuator for link mechanism for internal combustion engine, and method for assembling said actuator

In a cylindrical valve body, a first opening portion Mfor a heater heat exchanger and a second opening portion Mfor an oil cooler are arranged parallel in an axial direction of the valve body. A third opening portion Mfor a radiator is arranged in a different circumferential direction position from the first or second opening portion Mor Mon an outer peripheral surface of the valve bodyso that at least a part of the third opening portion Moverlaps with the first or second opening portion Mor Min the axial direction.

Flow rate-controlling valve

An actuator of a variable compression ratio mechanism which includes: a control link; a control shaft; a housing; a wave gear speed reduction device arranged to transmit the reduced rotation speed to the control shaft; a first bearing portion which is provided between the control shaft and a wave generation device of the wave gear speed reduction device, and which rotatably supports a first axial end portion of the wave generation device; and a second bearing portion which is provided between the housing and the wave generation device, and which rotatably supports an second axial end portion of the wave generation device, at least one of the first bearing portion and the second bearing portion being disposed inside an axial width of an outer circumference portion of the wave generation device.

Actuator of link mechanism for internal combustion engine and actuator for variable compression ratio mechanism

A centrifugal pump comprises a hollow pump body. An impeller is rotatably installed in a pump chamber defined in the pump body. The impeller has a front side facing a major part of the pump chamber and a rear side facing a bottom wall of the pump chamber. The hollow pump body has both a water discharge passage and a water discharge port formed therein. A water guide ridge is positioned between the pump chamber and the water discharge passage to smooth a water flow from the pump chamber toward the water discharge port. The water guide ridge extends upstream in the water discharge passage and projects from the inner wall toward the major part of the pump chamber. The water guide ridge has an upstream end portion sloped. With this sloped upstream end portion, undesired cavitation in the pump is suppressed or at least minimized.

Growing community of inventors

Atsugi, Japan

Junichiro Onigata