Abstract: A variable displacement pump has a cam ring, a rotor, a plurality of vanes, a pressure plate and a rear body. The cam ring is accommodated within a pump body. The rotor rotates within the cam ring. The plurality of vanes are inserted retractably into slits formed at regular intervals circumferentially in the rotor. The pressure plate and the rear body carry the cam ring and the rotor. A circular groove communicating to a back pressure inlet bore on a bottom portion of the slits is formed in a suction area on a face of the rear body on a side of the rotor. The groove is communicated via a communication passage to a passage between a power steering gear and a tank T to introduce a working oil after used in the power steering gear.

Abstract: A pump including a pump chamber 18, formed in a pump body 11, between a cam ring 17 and a rotor 15. The cam ring is formed so as to move in a direction whereby the pump capacity of the pump chamber increases and decreases. First and second fluid pressure chambers 33 and 34 are formed at opposite sides of the cam ring 17. The pump has a spool that is axially moved by a difference in fluid pressure between upper and lower stream sides of a metering throttle 50 connected to a discharge side passage 27 of the pump chamber. The spool is part of a control valve 30 that controls fluid pressure in at least the first fluid pressure chamber. An electronic driving unit, for example, a solenoid 60, applies axial thrust to the spool of the control valve.

Abstract: A cam ring 10 is slidably supported within a pump body 2, and a rotor 20 is rotatably disposed inside the cam ring. The cam ring is eccentric to a rotation shaft 22 of the rotor. The rotor carries a plurality of vanes 18 that can be advanced or retreated, in which a pump chamber 24 is formed in a space between the cam ring and the rotor. The cam ring is formed with the first and second fluid pressure chambers 14 and 16 on both sides thereof, and biased in a direction where the displacement of the pump chamber is at maximum by a spring 26. A control valve 28 is provided in which a differential pressure across a metering orifice is applied on both ends of a spool 32 and a spring 36 is disposed on the side of an end face where a downstream fluid pressure is applied. The fluid pressures of the fluid pressure chambers 14 and 16 are controlled by means of the control valve, whereby the cam ring is swung.

Abstract: The present invention relates to a repair and reinforcement method for preexisting structures such as buildings or the like, and in particular, relates to a repair and reinforcement method for concrete structures, and to an anisotropic textile employed in this method. The present invention provides a method which permits execution even in low temperature conditions, and which moreover exhibits superior repair and reinforcement effects in a short period of time; during the impregnation of a resin into a sheet material comprising reinforcement fibers and the curing of this resin to form a fiber-reinforced resin layer which is used in the repair and reinforcement of preexisting structures, a reactive mixture having a gelling period of 15 minutes or more at a temperature of 20° C. and which polymerizes even at 5° C.

Abstract: A pump chamber 18 is formed between a cam ring 17 and a rotor 15 in a pump body 11. The cam ring is formed so as to move to direction that pump capacity of the pump chamber increases and decreases. A first and second fluid pressure chambers 33 and 34 are formed at both sides of moving direction of the cam ring 17. The pump has a spool operates to axis direction by difference in fluid pressure of upper and lower stream sides of a metering throttle 50 formed on a way of a discharge side passage 27 of the pump chamber and provides at least a control valve 30 controlling fluid pressure in the first fluid pressure chamber. An electronic driving unit applying thrust to axis direction to the spool of the control valve, for example, a solenoid 60 is provided.

Abstract: An oil pump includes pump constituent elements, a pump body, and a driving shaft. The pump constituent elements define a pump chamber between a rotor and a cam ring that houses the rotor. The pump body is constituted by a front body and a rear body. The front body defines a housing space for housing the pump constituent elements. The driving shaft extends through and is axially supported by the front body to rotatably drive the rotor. An annular space is formed around the driving shaft in the front body, between a bearing for rotatably driving the driving shaft of the front body, and the pump chamber of the pump constituent elements. A flow control valve is placed in the annular space to return part of a pump discharge fluid from the pump chamber to a pump suction side.

Abstract: The present invention relates to a repair and reinforcement method for preexisting structures such as buildings or the like, and in particular, relates to a repair and reinforcement method for concrete structures, and to an anisotropic textile employed in this method. The present invention provides a method which permits execution even in low temperature conditions, and which moreover exhibits superior repair and reinforcement effects in a short period of time; during the impregnation of a resin into a sheet material comprising reinforcement fibers and the curing of this resin to form a fiber-reinforced resin layer which is used in the repair and reinforcement of preexisting structures, a reactive mixture having a gelling period of 15 minutes or more at a temperature of 25° C. and which polymerizes even at 5° C.

Abstract: A hydraulic pump control system is shown that can control the absorbing torque of a hydraulic pump with respect to the engine power for driving the hydraulic pump in a well-balanced manner, and reduce a deviation of an actual revolution number from a target revolution number of the engine. A torque of hydraulic pumps during operation is estimated from a pump pressure and first and second line pressures. Based on the estimated torque, an output torque of the hydraulic pumps is controlled so that an error between a target revolution number and an actual revolution number of the engine becomes null.

Abstract: A clip includes a female member having a cylindrical body having a hole with an expanded engaging portion around an inner surface at an upper end opening of the hole, spreadable legs formed by dividing a lower end portion of the body, and a flange extending outward from a peripheral surface at an upper end portion of the body, and a male member that is inserted into the female member, the male member comprising a head portion, a shaft vertically descending from an underside of the head portion, and an engaging recess formed around a periphery of a lower end of the shaft that can receive the expanded engaging portion of the female member to maintain the male and female members in a provisionally assembled state.

Abstract: A variable capacity or displacement type pump by which a pump discharge quantity is variably controlled in accordance with the revolution number, which has simple construction to contributes easier machining and assembling, and is reliable in operation. A cam ring is movably arranged to define a pump chamber around a rotatable rotor within a pump body and is biased so that the volume of the pump chamber is made maximum. Sealing members are provided in an annular space between the cam ring and the pump body so as to define first and second hydraulic pressure chambers through which the cam ring is driven to move. A switch valve is provided to control the hydraulic pressure transmitted to the first and second chambers in accordance with the quantity of the flow discharged from the pump chamber.

Abstract: A cushioning material sheet to be interposed between a rack support and a press plug for applying an elastic force provided by a spring is formed such that at least its one end face is tapered. Slide-contact surfaces of the rack support and the press plug to be brought into contact with the two end faces of the cushioning material sheet are so formed as to move the cushioning material sheet in a direction perpendicular to a rack support direction, along which the thickness of the cushioning material sheet is decreased. A biasing member is provided to bias the cushioning material sheet in this direction of movement, thereby obtaining a proper meshed condition between a pinion and a rack.

Abstract: An electric power steering apparatus includes a gear wheel on a driven side having a gear portion on one side surface thereof on a steering shaft and a pinion to be laterally meshed with a gear portion of the gear wheel on a shaft capable of transmitting a rotational driving force from an electric motor. The gear wheel and the pinion constitute a gear mechanism for transmitting a rotational force as a gear pair with non-parallel, non-intersecting axes. The gear wheel is axially supported on the steering shaft so as to be coupled in only a rotational direction and movable in an axial direction of the shaft. A biasing unit is provided on the other side of the gear wheel opposite to a portion of the pinion to be meshed with the gear portion and laterally urges the gear wheel toward the pinion.

Abstract: A double-insulated transformer of the coaxial type comprises a core assembly having a center core, a primary winding assembly assembled to surround coaxially the center core which has a primary bobbin case, a primary coil winding wound around the bobbin case and a primary terminal portion provided at an axial end of the bobbin case for connecting the primary coil winding and input lead lines, a secondary winding assembly to surround coaxially the primary winding assembly which has a secondary bobbin case, a secondary coil winding wound around the secondary bobbin case and a secondary terminal portion provided at an axial end of the secondary bobbin case opposite to the primary terminal portion for connecting the secondary coil winding with external lead lines, and an insulating case assembled to surround coaxially the secondary winding assembly.

Abstract: A device for improving the starting response of a vane pump and for reducing the power loss during a high speed operation of the pump. The vane pump includes a rotor formed with slits, in which slits vanes are slidably disposed. To drive the respective vanes into abutment against a cam ring, a pair of plates which hold the rotor and the cam ring sandwiched therebetween are formed with a plurality of arcuate grooves, into which a discharged oil is introduced. Rather than providing a narrow groove formed in the same plate as that in which the arcuate grooves are formed to provide a communication therebetween, an annular groove is formed in the lateral surface of the rotor to replace the narrow groove or in addition to the narrow groove, and is constructed so that the narrow groove is interrupted by the vanes as the vanes retract, the annular groove providing a communication between the arcuate grooves when a respective vane is driven radially outwardly.

Abstract: A bobbin case for use in a transformer of the double-insulated type comprises an insulating member of tube-like shape, a partition wall disposed substantially normal to the axis of the insulating member so that the inner space of said insulating member is divided into two recesses for receiving primary and secondary winding assemblies, respectively, from the opposite directions along the axis of said insulating member, and a pair of insulating rims which extend from the outer end surfaces of the insulating member at the side of the recess for receiving the primary winding assembly. The pair of insulating rims are formed such that they are capable of being bent inwardly along the outer end surfaces so as to obtain a creeping distance between said primary winding and a core inserted into center holes in said winding assemblies. By using the bobbin case, the insertion of the primary and secondary winding assemblies can easily and efficiently be carried out.

Abstract: An electrical power steering apparatus includes a vehicle velocity sensor for detecting a vehicle velocity, a steering torque sensor for detecting a steering torque of a steering wheel, comparators for receiving the voltage signal from the steering torque sensor and detecting a steering direction, a motor drive mechanism, a vehicle wheel declination sensor for detecting a declination of a vehicle wheel, a nonsteering state detecting unit including an absolute value converter, a reference voltage generator and a comparator to detect a nonsteering state, and a controller for supplying a current of a magnitude corresponding to the declination of the vehicle wheel to the motor so as to decrease the declination during the nonsteering state.

Abstract: An electronic tuning AM/FM radio receiver utilizes a common circuit for both FM reception and AM reception to stop automatically the scanning operation on the local oscillation frequency at its optimum point thus attaining simplicity of circuit structure, whereas the prior art needed a pair of complicated circuits for FM reception and AM reception. There is a local oscillator for AM reception and a second local oscillator for FM reception provided independently or commonly to each other, a control circuit provided for controlling selectively the scanning operation of the local oscillators and holding the local oscillation frequency of the selected one of the local oscillators at a scanning frequency when a tuning signal is applied, and a converter provided for converting an FM intermediate frequency into an AM intermediate frequency.

Abstract: A digital oscillator is provided which has digital oscillation outputs corresponding to the sweep speed of the local oscillation frequency of a local oscillator included in an electronic tuning radio receiver. An oscillation frequency controlling element which forms an external oscillation frequency control section of the digital oscillator and a circuit constant variable upon variations in its working length, is mounted on an operator operable knob shaft on the operational panel of the radio receiver around the rotation path of a sweep speed controlling element mounted coaxially thereto. The sweep speed controlling element and the oscillation frequency controlling element are connected to an input section of the digital oscillator. There is further provided a Distance/LOCAL receiver mode selecting element coaxially on the knob shaft.

Abstract: A power steering valve system includes an input shaft and an output shaft which are aligned on a common axis, and also includes a control valve mechanism which is located offset from the axis in order to reduce the overall length of the valve system. The control valve mechanism includes a spool valve, a displacement of which from its neutral position controls the flow of a hydraulic oil from an oil pump to or from a power cylinder to assist in directing the steerable road wheels in a given direction. The input and output shafts are operatively associated with a motion translating mechanism which translates the magnitude of a relative torsion between the two shafts into a linear displacement. The motion translating mechanism is operatively associated with the spool valve to displace it from the neutral position in accordance with the magnitude of relative torsion between the two shafts.