Abstract: A variable valve timing system is provided with a relative rotation controlling mechanism allowing relative rotation of the housing member and the rotor member by an unlock operation through the supply of operation fluid, and restricting the relative rotation of the housing member and the rotor member at an intermediate angle phase between a most retarded angle phase and a most advanced angle phase by a lock operation through the discharge of the operation fluid. A hydraulic pressure circuit controls the supply and discharge of the operation fluid to the relative rotation controlling mechanism and also controls the supply and discharge of the operation fluid to the advanced angle chamber and the retarded angle chamber. The hydraulic pressure circuit is adapted to discharge the operation fluid from the advanced angle chamber, the retarded angle chamber and the relative rotation controlling mechanism when the combustion engine is started.

Abstract: A valve timing control device incorporates a rotary member which rotates with one of a crankshaft of an internal combustion engine and a camshaft thereof, a rotational transmitting member which rotates with the other of the camshaft and the crankshaft; a vane provided on the rotary member; a pressure chamber formed between the rotary member and the rotational transmitting member, and divided into an advancing chamber and a delaying chamber by the vane; an oil retainer disposed between one axial end of the rotational transmitting member and one axial end of the rotary member; and a pressurized portion disposed between the other axial end of the rotational transmitting member and the other axial end of the rotary member.

Abstract: A variable valve timing system have a rotor member relatively rotatably mounted into a housing member and forming an advanced angle chamber and a retarded angle chamber at a vane portion in the housing member. In the system, a lock member of a lock mechanism is not caught between the rotor member and the housing member when a volume of either the advanced angle chamber or the retarded angle chamber shifts from an initial volume to a target volume. The hydraulic pressure within the system is shifted from an initial condition in which the volume is maintained at the initial volume and locked by the lock mechanism, to another condition in which the volume is varied to the target volume after passing a transition in which the volume is maintained at the initial volume and the lock mechanism is being unlocked during a predetermined time.

Abstract: The present invention provides a valve timing regulating device which controls the opening/closing timing of an exhaust valve of an internal engine combustion engine so that upon starting the engine a rotor member is rotated relative to a housing member for reaching in shorter time duration a region in which a lock mechanism functions. The valve timing regulation device includes a fluid pressure circuit controlling the supply and drainage of operating fluid to and from each of the advance angle fluid chamber and the retard angle fluid chamber.

Abstract: A variable valve timing system that inhibits or substantially prevents the generation of noise produced by the vane at engine start, improves smooth engine start and enlarges the variable timing control area includes a first relative rotation restricting member restricting relative rotation between a rotation member and a rotation transmitting member from the most advanced angle position to the most retarded angle position at a position corresponding to engine start and a second rotation restricting member restricting relative rotation between the rotation member and the rotation transmitting member from the most retarded angle position to the most advanced angle position at the position corresponding to the engine start and releasing the restriction by fluid pressure in the advanced angle chamber.

Abstract: A valve timing control device comprising a valve opening and closing rotary shaft assembly rotatably assembled within a cylinder head of an internal combustion engine, a rotational transmitting member mounted around the peripheral surface of the rotary shaft assembly so as to rotate relative thereto within a predetermined range for transmitting a rotational power from a crank shaft, a vane provided on one of the rotary shaft assembly and the rotational transmitting member, a chamber formed between the rotary shaft assembly and the rotational transmitting member, and divided into an advancing chamber and a delaying chamber by the vane, a first fluid passage for supplying and discharging a fluid to and from the advancing chamber, a second fluid passage for supplying and discharging a fluid to and from the delaying chamber, a refuge hole formed in one of the rotational transmitting member and the rotary shaft assembly for accommodating therein a locking pin spring-biased toward the other of the rotary shaft asse

Abstract: A valve timing control device comprising a rotor adapted to be fixed on a cam shaft of an engine, a rotational transmitting member mounted around the peripheral surface of the rotor so as to rotate relative thereto within a predetermined range for transmitting a rotational power from a crank shaft, a chamber defined between the rotor and the rotational transmitting member and having first and second circumferentially opposed walls, a vane provided with the rotor and extended outwardly therefrom in the radial direction into the chamber so as to divide the chamber into an advancing chamber and a delaying chamber, the vane being movable between the first and second walls, a locking means for locking between the rotor and the rotational transmitting member at a predetermined relative phase, when the vane is not in contact with either the first or second walls, a first fluid passage for feeding and discharging a fluid to and from the advancing chamber, a second fluid passage for feeding and discharging the fluid t

Abstract: A valve timing control device incorporates a rotary shaft rotatably assembled within a cylinder head of an internal combustion engine, a rotational transmitting member mounted around the peripheral surface of the rotary shaft so as to rotate relative thereto within a predetermined range for transmitting a rotational power from a crank shaft, a vane provided on either one of the rotary shaft and the rotational transmitting member, a pressure chamber formed between the rotary shaft and the rotational transmitting member, and divided by the vane into an advance chamber and a delay chamber, a first fluid passage for supplying and discharging a fluid to and from the advance chamber, a second fluid passage for supplying and discharging a fluid to and from the delay chamber, a locking mechanism for holding the relationship between the rotary shaft and the rotational transmitting member at a middle position of the predetermined range, when the internal combustion engine starts, and a controlling mechanism for restric

Abstract: A valve timing control device for controlling the opening/closing timing of the intake valve or exhaust valve of an internal combustion engine is disclosed, comprising a valve opening/closing rotary shaft rotatably assembled with the cylinder head of the internal combustion engine; a rotation transmitting member mounted around the rotary shaft so as to rotate relative thereto within a predetermined range for transmitting a rotating power from a crank shaft; vanes provided on the rotary shaft or the rotation transmitting member; a fluid chamber formed between the rotary shaft and the rotation transmitting member and halved into advancing chambers and delaying chambers by the vanes; first fluid passages for feeding and discharging a fluid to and from the advancing chambers; second fluid passages for feeding and discharging the fluid to and from the delaying chambers; a refuge hole formed in the rotation transmitting member or the rotary shaft and accommodating therein a lock pin spring-biased toward the rotary

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 rotational shaft for opening and closing a valve, a rotational transmitting member rotatably mounted on the rotational shaft, a vane connected to one of the rotational shaft and the rotational transmitting member, a chamber defined between the rotational shaft and the rotational transmitting member and divided into a first pressure chamber and a second pressure chamber by the vane being extended into the chamber, a fluid supply 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 rotational shaft and the rotational transmitting member when the relative phase between the rotational shaft and the rotational transmitting member is in a predetermined phase and a damping mechanism for damping the locking operation of the locking means.

Abstract: A valve timing control device includes a rotation shaft for opening and closing a valve, a rotation transmitting member rotatably mounted on the rotation shaft, a vane connected to one of the rotation shaft and the rotation transmitting member, a chamber defined between the rotation shaft and the rotation transmitting member and divided into a first pressure chamber and a second pressure chamber by the vane extending into the chamber, a first fluid passage in fluid communication with the first pressure chamber for supplying and discharging the fluid therein and therefrom, respectively, a second fluid passage in fluid communication with the second pressure chamber for supplying and discharging the fluid therein and therefrom, a retracting hole formed on one of the rotation shaft and the rotation transmitting member, a locking pin slidably fitted in the retracting hole and urged toward the other of the rotation shaft and the rotation transmitting member, a receiving hole formed on the other of the rotation shaf

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: A constant voltage circuit adapted for connection between high voltage power source and low voltage power source terminals respectively to output a constant voltage signal from an output terminal in response to a control signal inputted to an input terminal. The circuit has a resistor circuit including a MOS transistor for connection to the high voltage power source and activated in response to the control signal. A current mirror section is connected between the resistor circuit and the low voltage power source terminal to generate an output voltage to be outputted from the output terminal. A feedback section is connected between the resistor circuit and the low voltage power source terminal to control the current mirror section to keep the output voltage constant by detecting deviation of the output voltage.

Abstract: An integrated circuit device formed on a chip includes a pair of signal input terminals, a signal discriminating circuit having a pair of input terminals coupled to the signal input terminals, for comparing a data signal and a reference signal supplied through the input terminals and for determining whether or not the level of said data signal is higher than that of said reference signal, a pair of test signal terminals to which a predetermined voltage is applied, and a voltage dividing circuit for dividing the predetermined voltage to thereby generate a test signal to be supplied to the signal discriminating circuit through the input terminals.

Abstract: An integrated circuit device formed on a chip includes a pair of signal input terminals, a signal discriminating circuit having a pair of input terminals coupled to the signal input terminals, for comparing a data signal and a reference signal supplied through the input terminals and for determining whether or not the level of said data signal is higher than that of said reference signal, a pair of test signal terminals to which a predetermined voltage is applied, and a voltage dividing circuit for dividing the predetermined voltage to thereby generate a test signal to be supplied to the signal discriminating circuit through the input terminals.

Abstract: A PLL frequency synthesizer includes a reset circuit which determines whether or not an oscillator starts to normally generate an oscillation signal in response to a power save signal which intermittently operates the oscillator in a standby mode and which outputs a reset signal to a prescaler when it is determined that the oscillator normally generates the oscillation signal. A hold circuit prevents a frequency-divided signal being output from the prescaler to a programmable counter and an initial phase detection circuit until the prescaler is reset to an initial state in response to the reset signal and starts to normally generate the frequency-divided signal.

Abstract: An integrated circuit device formed on a chip includes a pair of signal input terminals, a signal discriminating circuit having a pair of input terminals coupled to the signal input terminals, for comparing a data signal and a reference signal supplied through the input terminals and for determining whether or not the level of said data signal is higher than that of said reference signal, a pair of test signal terminals to which a predetermined voltage is applied, and a voltage dividing circuit for dividing the predetermined voltage to thereby generate a test signal to be supplied to the signal discriminating circuit through the input terminals.

Abstract: An integrated circuit device formed on a chip includes a pair of signal input terminals, a signal discriminating circuit having a pair of input terminals coupled to the signal input terminals, for comparing a data signal and a reference signal supplied through the input terminals and for determining whether or not the level of said data signal is higher than that of said reference signal, a pair of test signal terminals to which a predetermined voltage is applied, and a voltage dividing circuit for dividing the predetermined voltage to thereby generate a test signal to be supplied to the signal discriminating circuit through the input terminals.

Abstract: A logic circuit comprises a first terminal for receiving an input data signal, a second terminal for receiving a clock signal, a first latch circuit coupled to the first and second terminals for latching the input data signal responsive to the clock signal, a second latch circuit coupled to the first latch circuit for latching an output signal of the first latch circuit, a third terminal for outputting an output data signal which is output from the second latch circuit, and a selecting part coupled to the third terminal for selectively feeding back the output data signal to the first latch circuit in a first mode and for cutting off the feedback of the output data signal to the first latch circuit in a second mode, where the logic circuit operates as a toggle flip-flop in the first mode and operates as a delay flip-flop in the second mode. The input data signal received by the first terminal selectively identifies one of the two modes of the flip-flop.