Abstract: An oil pump apparatus which includes an oil pump for being driven by a driving source and for being connected to a plurality of components to which an oil is supplied from the oil pump and a control valve preventing the oil which is unnecessary to the components from flowing into the components, wherein at least one of the components is an actuator operated by an oil pressure generated by the oil pump and wherein the control valve permits the oil of which the quantity is smaller than that of the oil which is consumed by the actuator to flow into the components when the actuator is not operated and the control valve permits the oil of which the quantity is larger than that of the oil which is consumed by the actuator to flow into the components when the actuator is operated.

Abstract: A variable valve timing controller according to the present invention comprises a locking mechanism for holding the vane in the middle of the pressure chamber until the internal combustion engine starts; and a damper for sealing up one of the advance chamber and the delay chamber and for slowing the relative rotation between the rotational shaft and the rotation-transmitting member. According to the present invention, the locking mechanism maintains the vane in the middle of the pressure chamber until the internal combustion engine starts. Therefore, the vane cannot vibrate even when unstable transitional pressure is supplied to the pressure chamber so that no undesirable noise shall be generated. Further, the valve timing may be further delayed after the internal combustion engine starts since the vane is maintained in the middle of the pressure chamber.

Abstract: An oil pump apparatus which includes an oil pump for being driven by a driving source and for being connected to a plurality of components to which an oil is supplied from the oil pump and a control valve preventing the oil which is unnecessary to the components from flowing into the components, wherein at least one of the components is an actuator operated by an oil pressure generated by the oil pump and wherein the control valve permits the oil of which the quantity is smaller than that of the oil which is consumed by the actuator to flow into the components when the actuator is not operated and the control valve permits the oil of which the quantity is larger than that of the oil which is consumed by the actuator to flow into the components when the actuator is operated.

Abstract: A valve timing control device includes a rotor fixed on a cam shaft, a housing member rotatably mounted on the cam shaft so as to surround the rotor, a chamber defined between the housing member and the rotor and having a pair of circumferentially opposed walls, a vane mounted on the rotor and extended outwardly therefrom in the radial direction into the chamber so as to divide each of chamber into a first pressure chamber and a second pressure chamber, a fluid supplying device for supplying fluid under pressure to at least a selected one of the first pressure chamber and the second pressure chamber, a locking mechanism for connecting the housing member and the rotor and a canceling device for canceling the locking mechanism and for keeping the locking mechanism canceling by the fluid pressure of the fluid supplying device.

Abstract: A valve timing control device includes a rotor fixed on a cam shaft, a housing member rotatably mounted on the cam shaft so as to surround the rotor, a chamber defined between the housing member and the rotor and having a pair of circumferentially opposed walls, a vane mounted on the rotor and extended outwardly therefrom in the radial direction into the chambers so as to divide each of chambers into a first pressure chamber and a second pressure chamber, a fluid supplying device for supplying fluid under pressure to at least a selected one of the first pressure chamber and the second pressure chamber, and a concave portion formed on the radially outer ends of the opposed walls of the chamber.

Abstract: A variable valve timing device includes a rotation shaft and a rotation transmitting member rotatably mounted thereon so as to define a pressure chamber between the shaft and the member. The pressure chamber is divided by a vane extending from the shaft into an advance angle space and a delay angle space. Differentiating pressures in both spaces establishes rotation of the shaft, which enables an adjustment of the phase angle between the shaft and the member. A retracting bore and a receiving bore are formed in the member and the shaft, respectively. A locking valve and a piston are fitted in the retracting bore and the receiving bore, respectively. A fluid passage is formed which extends to a boundary portion between the piston and the locking valve.

Abstract: A valve timing control device comprising a rotor fixed on a cam shaft of an engine, a housing member rotatably mounted on the cam shaft so as to surround the rotor is disclosed. The valve timing control device also comprises a chamber defined between the housing member and the rotor and having a pair of circumferentially opposed walls, a vane mounted on the rotor and extended outwardly therefrom, in the radial direction into the chamber so as to divide the chamber into a first pressure chamber and a second pressure chamber, a fluid supplying means for supplying fluid under pressure to at least a selected one of the first pressure chamber and the second pressure chamber and a force means for expanding one of the first pressure chamber and the second pressure chamber.

Abstract: An oil pump apparatus incorporates, an oil pump housing, and a rotor located in the oil pump housing, wherein the rotor forms a first set of pockets having a capacity increasing toward the rotating direction of the rotor and a second set of pockets having a capacity decreasing toward the rotating direction of the rotor. The apparatus further includes a plurality of suction ports connected with the first set of pockets, each of the suction ports being isolated from other adjacent suction ports, a discharge port connected with the second set of the pockets, and a control valve.

Abstract: A variable valve timing system in an engine having a rotating cam-shaft includes an input pulley driven by the engine, a piston engaged with the input pulley so as to be displaceable in angular direction relative thereto, a cup-shaped casing mounted on the piston so as to be displaceable in angular direction relative thereto and connected to the cam-shaft, a cup-shaped cover accommodating therein the cup-shaped casing with a clearance and connected to the input pulley, a damper containing an amount of viscous fluid disposed in the clearance, a first sealing member disposed at one end of the clearnace, and a second sealing member disposed at the other end of the clearance, and having a characteristic in that a fluid-tight function between the cup-shaped cover and the cup-shaped casing becomes less as a centrifugal force increases.

Abstract: A valve operation control system for an internal combustion engine having a cam-shaft and a crank-shaft has an adjusting device for adjusting a phase difference between the cam-shaft and the crank-shaft by being supplied with hydraulic pressure, a driving device integrated with the adjusting device and having an oil pump driven by the cam-shaft and a hydraulic pressure line between the oil pump and the adjusting device, and a hydraulic pressure control device disposed in the hydraulic pressure line for regulating the hydraulic pressure to be supplied to the adjusting device.

Abstract: For minimizing a diameter of an apparatus which is located on the cam-shaft and changes a phase between two cam-shafts, a variable valve timing system in an engine having first and second cam-shafts is comprised of a first gear rotatably supported on the first cam-shaft, a second gear fixed to the second cam-shaft, and geared with the first gear to transmit torque to the second cam-shaft, a first device for transmitting torque from the first cam-shaft to the first gear, and for rotating the first gear toward a first position, the first device being located on one end of the first cam-shaft, and a second means for rotating the first gear in a second direction opposite the first direction, toward a second position, the second device being located on one end of the second cam-shaft.

Abstract: A two wheel drive/four wheel drive change over apparatus for four-wheel drive vehicles includes an actuator having a vacuum chamber. A tank storing an engine vacuum through a check valve is integrally formed in the vacuum chamber, whereby the engine vacuum stored in the tank can be used for operating the actuator.

Abstract: A ventilator for use with an internal combustion engine includes an oil sump located at the lower end of the vertically extending outlet tube of the ventilator, a check valve disposed at the bottom of the sump for allowing fluid to flow from the sump toward the pressure chamber of the ventilator, and an outlet port extending out through the side wall of the outlet tube. The outlet tube is in communication with an intake manifold via the outlet port. The oil sump cooperates with the check valve to prevent oil from flowing into the intake manifold through the outlet port.

Abstract: A fluid control valve actuated by differential pressure across a diaphragm member. The diaphragm member is secured to a piston mounted thereon with a seal ring. The seal ring is in fluid-tight sliding engagement with a casing having an inlet port and an outlet port, but is brought into disengagement from the casing upon movement of the piston due to differential pressure across the diaphragm member. Thus, communication between the inlet and the outlet ports may be accomplished.

Abstract: A vacuum actuator for connection to a vacuum source, the actuator utilizing a diaphragm combination having three stable positions. An annular diaphragm, having its outer periphery fixed in a housing, has its inner periphery secured between two movable annular members, the diaphragm and the annular members forming a combination dividing the housing into upper and lower chambers. Two inlet ports individually supply a vacuum force or atmospheric pressure to the upper chamber, the first one of the ports including a projection extending toward a space formed by the movable members. A poppet valve normally closes an opening at the top of the space, the bottom of the space normally having access to the atmosphere. When vacuum is applied to the first port, the diaphragm combination is raised from a biased first position to the position where the poppet valve interrupts the vacuum through the projection, determining the second position.