Abstract: An improved rotor shaft for an alternator reduces the number of corresponding parts thereof. The rotor shaft includes a reinforced insert embedded within a shaft for preventing buckling, the shaft being molded using an engineering plastic; a threaded portion formed at one end of the shaft; a pulley engaging portion formed at the other end of the shaft; a rear bearing engaging portion inwardly formed from the pulley engaging portion; a spline inwardly formed from the rear bearing engaging portion for tightening the rotor; and a small diameter portion outwardly formed from the threaded portion.

Abstract: A pressure control valve for a power steering apparatus comprises a pin extending along the movement of a spool and contacting on a solenoid with one end of the pin, a bore provided slidably in the spool and having a longer length than the pin, a first annular groove communicated with an oil passage change valve, and a second annular groove communicated with a reaction chamber as well as the first groove, and the second groove communicating with the bore.

Abstract: An oil volume control valve 100 is arranged between a power cylinder 10 and an oil passage change valve in a parallel manner. The compressed oil of chamber 11 or 13 of a power cylinder can be bypassed toward a tank 50 through bi-directional orifices 136, 138 of a spool 130 depending on the position of the spool 130. The opening degree of the orifices 136, 138 is controlled by the speed and steering velocity of the vehicle.

Abstract: An improved anti-lock brake system for a vehicle includes an open-type hydraulic valve, a closed-type hydraulic valve, an operational liquid storing apparatus, and a solenoid pump. The open-type solenoid valves supply a braking force generated at the master cylinder to the brake wheel cylinders. The closed-type solenoid valves lock the pressure of the brake wheel cylinders and operate to decompress the wheel cylinders. Decompressing orifices determine a decompressing level for the brake wheel cylinders. The liquid storing apparatus stores liquid introduced thereto from the decompressing orifices. The solenoid pumps supply the liquid stored in the liquid storing apparatuses to the brake wheel cylinders to generate a braking force at the wheel cylinders.

Abstract: An electronic control type brake booster having a brake booster; an air path separately formed from a path to which an engine vacuum pressure of said brake booster is applied; a pressure control valve arranged in the air path and driven by a solenoid valve, said pressure control valve providing a pilot pressure to the air path of said brake booster to control the pressure in the air path to a pressure between atmospheric pressure and the engine vacuum pressure; a wrinkled bellows tube connected to a predetermined portion of said air path connected to the pressure control valve; an operational chamber inwardly formed of a movable wall communicated with the bellows tube; a plunger located at an inside portion of the movable wall and formed with an operational chamber and a further chamber according to an operation of the plunger; an annular element arranged between the plunger and the movable wall; and a hole formed at the upper portion of the annular element and communicating with the further chamber.

Abstract: An insulating plate for a vehicle alternator has a semi-circular body with insulating bushes formed at both ends of the body and an extension formed at one end of the body to support the bottom of a terminal plate of the alternator. A pair of vertical walls are formed on both sides of the extension to tightly grasp the sides of terminal plate. The body of the insulated plate also has at least one protective guide hole to guide the phase leads which extend from the stator to the rectifier.

Abstract: A power assistance steering system for use in a vehicle comprises a restricting mechanism including a cylindrical reaction piston having a reaction surface on which said reaction pressure is applied in order to cause said reaction piston to be biased downwardly, and at least one reversed V-shaped depression formed on a bottom skirt, the cylindrical reaction piston adapted to be held on the input shaft in such a way that said reaction piston can longitudinally and slidably reciprocate with respect to the input shaft, while circumferentially locked to the input shaft, and at least one semi-spherical protrusion formed on a middle end surface of said output shaft so as to be retained within the reversed V-shaped depression.

Abstract: A stopper manufacturing method of a silicon micromachining structure comping steps of growing an oxidized film on a n-type substrate; opening a n.sup.+ -diffusion window by the photo-lithography through first selective diffusion and forming a n.sup.+ -diffusion region using n-type impurity sources; forming a n.sup.+ diffusion region by the depth 0.5 to 5 .mu.m on the portion subject to form a stopper through the secondary diffusion; removing the oxidized film and growing a n-type silicon epitaxial layer on the front surface of the substrate; etching the n-type silicon epitaxial layer, selectively, exposing the n.sup.+ -layer and depositing a porous silicon layer in HF solution by the anodic reaction; and etching the porous silicon layer away in etching solution to form a microstructure, thereby preventing the side etching and the breaking down of the microstructure by the exterior shock.

Abstract: An automotive active suspension system according to this invention uses valves of a simplified structure so that the availability of installing space is improved and energy consumption is reduced by decreasing the quantity of the returned fluid.

Abstract: The invention relates to an in-line valve connected to a master cylinder for exhibiting the braking of automobile. The in-line valve is comprised of a body 20, a piston 30 installing slidably in the body and a plate spring 40 having a low height for supporting the linear movement of the piston.

Abstract: A method for fabricating an 8-beam bridge-type silicon acceleration sensor omprises the steps of: growing a silicon oxide layer on the top surface of the silicon substrate; forming an n.sup.+ diffusion region in the substrate by successively performing the process of opening a diffusion window in the silicon oxide layer, implanting n.sup.+ impurities in the silicon substrate through the diffusion window, and evenly diffusing the n.sup.+ impurities into the substrate; removing the silicon oxide layer, and then growing an epitaxial layer thereon; forming a plurality of piezo-resistors in the epitaxial layer by successively performing the process of growing an oxide layer on the epitaxial layer, implanting impurities, and then evenly diffusing the impurities; removing the silicon oxide layer; forming a porous silicon layer from the n.sup.

Abstract: An electric horn which comprises a diaphragm held at its peripheral portion in a housing of the horn and having an armature attached to a middle portion thereof; an electromagnet having a coil and disposed adjacent to the armature in an opposed relationship with each other for causing the armature to move down under an action of a magnetic field produced by an energizing current flowing through said coil; an interrupter having a pair of normally-closed contacts including a fixed contact and a movable contact and connected at one contact to a DC power source; a horn actuating switch connected serially in circuit with the interrupter; and a sparking free circuit including at least one electronic triggering switching means connected to the coil, for interrupting the energizing current supply to the coil of the electromagnet; the normally-closed interrupter located near the armature and connected to a control input of the triggering switching means, for turning ON and OFF the triggering switching means, the movab

Abstract: A method for fabricating a silicon diaphragm comprises the steps of preparing an n-type silicon substrate; diffusing n.sup.+ impurities in the silicon substrate to form an n.sup.+ diffusion region in a part of the upper wall thereof; growing an n-type silicon epitaxial layer thereon; forming a through-hole in the n-type silicon epitaxial layer to expose a part of the n.sup.+ diffusion region; performing an anodic reaction in an HF solution to make the n.sup.+ diffusion region a porous silicon layer; etching the porous silicon layer to form an air-gap;and, sealing the through-hole.

Abstract: An hydraulic anti-skid braking system for automobiles, comprising a master cylinder, a brake, a flow control valve, a solenoid valve, a piston pump, and an expander cylinder. During a skid condition, the solenoid valve is opened, and a the pump draws fluid from the brake through the solenoid valve and delivers fluid to the flow control valve to shut off a hydraulic connection between the master cylinder and the brake, while reducing fluid pressure to the brake. When pressure is equalized between the brake and the hydraulic line that is connected to the master cylinder, the control valve returns to its initial operation position.