Abstract: The present invention comprises a fuel pump controller having a silicon controlled rectifier (SCR) for supplying a power source voltage to a fuel pump circuit for driving a fuel pump when the SCR is turned on. A timer circuit is also provided for instantly turning on the SCR for a predetermined time period when an ignition switch is initially turned on so as to provide a discharge of fuel into the carburetor before the engine is activated or rotated. In addition, a controller is provided for repeatedly turning on the SCR each time the engine is rotated such that the fuel pump will be driven by rotation of the engine until such engine rotation ceases. By operation of this assembly, fuel is supplied to the carburetor for a predetermined time period before the engine begins to rotate so as to obtain an efficient and quick engine ignition despite the possible initial lack of fuel in the carburetor.

Abstract: A brake booster such as of a tandem type having a center plate disposed within a shell is disclosed. A valve body has a stepped end face, from which a cylindrical portion extends rearwardly. The cylindrical portion extends through a rear power piston and a rear diaphragm while maintaining a hermetic seal therebetween, with a distal end of the cylindrical portion being disposed within a variable pressure chamber of a rear chamber. The internal space of the cylindrical portion defines the rear end of a variable pressure passage. This arrangement allows the rear end of the variable pressure passage (the cylindrical portion) to be disposed in radially overlapping relationship with the rear power piston, thereby allowing the external diameter of the valve body to be reduced. In this manner, the effective area of the front power piston connected to the valve body may be increased as compared with the prior art.

Abstract: A subpump has its discharge flow rate increased in response to an increase in a vehicle speed. A variable throttle is disposed in a discharge passage from the subpump, and an oil pressure taken from the upstream side of the variable throttle is introduced into a hydraulic reaction chamber to produce a steering action. A main pump has its flow rate increased or decreased in accordance with a number of revolutions thereof, and feeds a pressure oil to a power steering control valve through a passage in which a fixed restriction is disposed. An oil pressure which prevails upstream of the fixed restriction acts upon the variable throttle to change its area of opening, thereby controlling the steering force.

Abstract: A liquid pressure booster includes a power piston slidably disposed in a housing, a power chamber in the housing on one side of the power piston, the power piston having a stepped bore including smaller and larger diameter bores, the latter opening into the power chamber, a supply passage communicating the smaller diameter bore to a pressure fluid source, a first valve seat in the smaller diameter bore, a valve element slidable in the smaller diameter bore to seat upon the first valve seat from the side nearer the pressure fluid source, an annular pin abutting the valve element side nearer the larger diameter bore to move the valve element away from the first valve seat, a discharge passage axially through the annular pin and communicating between the power chamber and a reservoir, and a second valve seat formed on the free end of the annular pin to interrupt communication between the power chamber and the discharge passage upon abutment of the annular pin against the valve element, a stepped sleeve having sm

Abstract: An electromagnetic pump includes a sleeve member, a resin coil bobbin, a ring-like printed circuit board, a ring-like holder, a plurality of studs, a pump housing, and a projecting portion. The sleeve member houses a plunger for controlling an operation of a control valve. The coil bobbin is arranged around the sleeve member, has a pair of flanges, and winds an excitation coil. The printed circuit board is stacked on the outer surface side of one flange of the coil bobbin with a predetermined interval therebetween and has a surface which faces the coil bobbin and on which various types of electronic parts are mounted. The holder is stacked on the side of the printed circuit board opposite to the coil bobbin with a predetermined interval therebetween. The studs project from the outer surface of the one flange of the coil bobbin and an inner surface of the holder and integrally form a stacked body.

Abstract: An improvement to an electrically driven power steering apparatus which utilizes an electric motor is disclosed. A bevel gear of a greater diameter is mounted on a steering shaft so as to be axially displaceable thereon, and an urging mechanism is connected between the bevel gear and the steering shaft. The urging mechanism renders the bevel gear to be incapable of rotation relative to the steering shaft, and also urges the teeth thereof toward the teeth of a bevel gear of a reduced diameter which is coupled to the electric motor. This prevents a backlash from occurring between the both bevel gears, thus preventing the occurrence of sounds of percussion as the both gears abut against each other.

Abstract: According to the present invention, a rotation preventive portion for preventing the rotation of bead portion, such as a stepped projection, is provided on the bead portion of diaphragm, which is squeezed between a front shell and a rear shell. When the front shell and the rear shell are assembled with such a diaphragm, the rotation of the bead portion is prevented by this rotation preventive portion (stepped bead). As the result, outer lip of the bead portion of diaphragm or the rolling portion of diaphragm are not squeezed between the front shell and the rear shell, and the front shell and the rear shell can be assembled without damaging or breaking the diaphragm.

Abstract: A brake booster is disclosed. More specifically, an improvement relating to a reinforcing plate which is used to reinforce a shell to which a master cylinder is connected is disclosed. The reinforcing plate comprises a pair of members, i.e. a first reinforcing plate which is disposed along the inner surface of the shell which provides a mounting surface for a master cylinder, and a second reinforcing plate which is disposed along the inner surface of the shell at a location radially outward of the mounting surface for the master cylinder. The rigidity of the shell can be increased without increasing a sheet thickness thereof.

Abstract: A steering force control apparatus for a power steering system includes a valve. The valve includes a valve hole, a spool, and a spring. A main pump oil supply path branched from a main hydraulic path extending from a pump to a power cylinder, a reaction path connected to a hydraulic reaction chamber, and a discharge path connected to a tank are open to the valve hole to be spaced apart from each other by predetermined distances along an axis of the valve. The spool is slidably arranged in the valve hole and has land portions so as to change connecting states of the main pump oil supply path, the reaction path, and the discharge path. The spring always biases the spool in one direction. A subpump oil supply path for supplying a fluid from a subpump whose delivery pressure is changed is connected to an end of the spool which is biased by the spring, thereby controlling an operation of the spool by the subpump in correspondence with a vehicle speed.

Abstract: In a clutch control method of a motor-driven power steering apparatus, a clutch is disconnected when a change width of a steering angle detected by a steering angle sensor is a predetermined angle or less and a steering torque detected by a torque sensor is a predetermined torque or more in both the steering directions. A clutch controller of a motor-driven power steering apparatus includes a first transistor arranged between one terminal of the clutch coil and a power source, a second transistor arranged between the other terminal of the clutch coil and an earth, and a current sensor connected in series with the first and second transistor.

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 reaction pressure control mechanism of power steering apparatus includes a power cylinder, to which a pressure oil discharged from an oil pump is supplied through a control valve, and oil discharged from the oil pump is branched to be introduced into a hydraulic reaction chamber, which produces steering reaction. A pair of variable restrictions are formed in a supply and discharge passage to and from the hydraulic reaction chamber, and a single spool which is operated by a solenoid is effective to increase the opening of one of the variable restrictions while reducing the opening of the other restriction. A plunger is disposed in opposing relationship with a rod associated with the solenoid and on which the spool is fixedly mounted so that when the oil pressure in the reaction chamber exceeds a given value, such oil pressure is introduced to the backside of the plunger to cause the spool to be driven back, thus reducing the opening of the variable restriction associated with the supply passage.

Abstract: In a rotary pump with a pressure switch, a pressure switch mounting space constituted by a small- and large-diameter holes is formed to be parallel to a rotating shaft in an end face portion of a front body to which a rear body is not joined. A pump outlet side fluid pressure is introduced to an inner end of the small-diameter hole. The large-diameter hole is connected to a pump inlet side. A plunger is slidably arranged in the small-diameter hole. The plunger is normally biased toward the inner end of the small-diameter hole and is kept movable toward the large-diameter hole depending on a magnitude of the fluid pressure of the pump outlet side. A pressure detector is operated when the fluid pressure of the pump outlet side exceeds a predetermined value.

Abstract: The present invention relates to a cap for reserve tanks, wherein said cap has a vent path. The cap consists of an upper member and a lower member, wherein an annular rib is defined in the upper surface of the lower member. The annular rib is forced into abutment with the lower surface of said upper member so as to form an inner chamber and an outer chamber between said upper and lower members. A portion of said annular rib is extended in the central direction of the annular rib, and a groove or a hole is formed in the extention of the annular rib, said groove or hole allowing communication between said inner and outer chambers.

Abstract: A method of controlling an electric power steering apparatus includes the steps of determining a steering state in accordance with a detection value and a retrieval value of a motor terminal across voltage, and limiting a motor current when a steering wheel held state is determined as the steering state determination result and a motor current value in the steering wheel held state is a predetermined value or more.

Abstract: A reaction transmitting mechanism for brake booster in which a reaction from an output shaft is transmitted to an input shaft through a reaction disc, a reaction transmitting member and a valve plunger. An annular member is fitted over the valve body, and is formed with a stepped opening, in which a stepped tubular reaction transmitting member is slidably fitted. The reaction transmitting member is formed with a through-opening, in which the front end of the valve plunger is slidably fitted. The right end face of the flange-like portion of the reaction transmitting member is disposed in opposing relationship with the valve body and the step in the valve plunger. As a result of such arrangement, a more free choice of servo ratios used upon actuating and releasing the brake is allowed as compared with the choice enabled in the prior art.

Abstract: A negative brake booster having a power piston 8 with a piston unit 8a extending in a radial direction, a cylinder unit 8b provided at a backward position in an axial direction and airtightly and slidably supported on a center plate 4. A front diaphragm 12 is provided between the outer peripheral edge of the piston unit 8a and the front shell 2. A rear power piston with a piston unit 9a extending in a radial direction and a cylinder unit 9b furnished at a backward position in an axial direction, and a rear diaphragm 12 are provided between the outer peripheral edge of the piston unit 9a and the front shell. Further, the rear power piston 9 is connected with the valve body 7 where the flange unit 8c of the front power piston 8 is squeezed between the stepped portion of the outer periphery of the valve body 7 by the rear power piston 9.

Abstract: A cylinder with a connected sleeve for supply and displacement of fluid through connection to an external piping, as well as an apparatus for and a method of manufacturing same are disclosed. An opening is formed to extend through the wall of a tubular body of the cylinder to provide a communication between the interior and the exterior thereof. A substantially flat abutment is formed on the outer surface around the opening. The outer peripheral surface of a connected sleeve is annularly in contact with the inner peripheral edge of the flat abutment, and the tubular body and the connected sleeve are joined together as by a welding operation.

Abstract: A hydraulic reaction device of a power steering apparatus includes a vehicle-speed responsive pump, a reaction plunger, a hydraulic reaction chamber, a path, and a variable control unit. The vehicle-speed responsive pump has a pressure oil discharge flow rate which changes in accordance with a vehicle speed. The reaction plunger selectively constraining relative pivotal displacement between input and output shafts constituting a rotary flow path switching valve of the power steering apparatus. The hydraulic reaction chamber receives the pressure oil from the pump to apply a reaction oil pressure to the reaction plunger. The path is arranged to connect the hydraulic reaction chamber to a tank. The variable control unit (a variable throttle portion 37 of a reaction oil pressure control valve 11) for variably controlling a flow rate of the pressure oil flowing through the path.

Abstract: A self temperature control type glow plug includes first and second resistor elements and a sheath. The sheath diameter of a first portion of the sheath in which the first resistor element is embedded is set to be smaller than the sheath diameter of a second portion of the sheath in which the second resistor element is embedded, wherein the ratio of the latter diameter of the former diameter ranges from 1.3:1 to 2:1. A tapered portion of the sheath joining the first and second sheath portions encloses a gap larger than at least the sheath diameter of the portion in which the first resistor element is embedded between the first and second resistor elements. The first and second resistor elements are connected to each other within the gap through a connecting means having a substantially zero resistance.