Abstract: A brake pressure control device of deceleration responsive type includes an inertia-controlled valve element cooperating with a valve seat in a valve chamber to control the ratio of brake fluid pressures being applied to front and rear wheel brake cylinders in response to the attainment of a predetermined rate of deceleration of the vehicle. In the control device, a partition member is assembled within the valve chamber to ensure the precise initial setting of the valve element, the partition member being further provided with a fluid passage to ensure the optimum control of fluid flow acting on the valve element.

Abstract: An anti-rust cover for a disc rotor used in a vehicle disc brake. It is characteristically provided, as a means of attaching the same to the dust cover, with a combined engaging mechanism composed of at least three engaging members in all, i.e., at least one inside engaging member and at least one outside engaging member, arranged alternatively with a predetermined circumferential phase difference on the inner surface thereof confronted to the dust cover, near the outer periphery of the anti-rust cover. It is to be snugly attached to the dust cover by being fitted-in by the outer periphery of the dust cover between the inside engaging member(s) and the outside engaging member(s).

Abstract: A fluid pressure control device for incorporation in a vehicle braking system between a master cylinder and a wheel brake cylinder which includes a housing provided with an inlet port for connection to the master cylinder, an outlet port for connection to the wheel brake cylinder, and a valve chamber communicating at one end thereof with the inlet port and at the other end thereof with the outlet port, an inertia-controlled valve including a valve seat provided in the valve chamber to permit the flow of fluid between the inlet and outlet ports therethrough, and an inertia-controlled valve element housed within the valve chamber to cooperate with the valve seat to cut off the flow of fluid from the inlet port to the outlet port when the valve element is subjected to a deceleration in excess of a predetermined value, a bypass passage for permitting direct fluid flow from the valve chamber into the outlet port, a check valve including a valve seat provided within the bypass passage and a valve member cooperating

Abstract: A fluid pressure control device in the form of an inertia-controlled valve unit comprises a bypass passage provided through a stepped piston to directly apply the master cylinder pressure to the wheel brake cylinders; a bypass valve including a valve seat provided within the bypass passage to permit the bypass flow of fluid between the inlet and outlet ports, a valve member axially movable within the bypass passage to co-operate with the valve seat to block the bypass flow, and a spring biasing the valve member toward the inlet port, the bypass valve being closed when a pressure difference between the inlet and outlet ports is below a predetermined value and being opened when the pressure difference exceeds the predetermined value; and an extension rod extended from the valve member toward the inlet port and being engageable with the inner wall of the valve housing to open the bypass valve.

Abstract: A device for controlling the hydraulic pressure in the hydraulic braking system of a vehicle, in such a manner that the hydraulic pressure in the rear wheel cylinder is increased at a rate smaller than that in the front wheel cylinder, after a predetermined level of deceleration of the vehicle is reached. The device has a valve chamber in which a ball valve is disposed movably. A differential piston has two opposing pressure receiving surfaces of different areas exposed in the inlet and outlet chambers. The arrangement is such that, when the predetermined level of deceleration is reached, the ball valve is moved due to its inertia to a position for interrupting the communication between the inlet and the outlet chambers. Once the communication between two chambers is interrupted, the pressure in the master cylinder is transmitted across the differential piston. The transmitted pressure is lowered at a rate corresponding to the ratio of the areas of pressure receiving surfaces of the differential piston.

Abstract: A braking hydraulic pressure control unit for a motor vehicle including a differential-acting piston having a plurality of pressure bearing portions facing an inlet compartment and an outlet compartment communicating with a master cylinder and rear wheel cylinders, respectively, of a vehicle braking system. The differential-acting piston is formed with shoe clearance compensating piston segments operative to reduce an inflow of a braking fluid into a spherical valve chamber at initial stages of brake application whereby unfavorable influences which would otherwise be exerted by the size of shoe clearances on a spherical valve at initial stages of brake application can be prevented.

Abstract: A brake pressure control device of deceleration responsive type includes an inertia-controlled valve element cooperating with a valve seat in a valve chamber to control the ratio of brake fluid pressures being applied to front and rear wheel brake cylinders in response to the attainment of a predetermined rate of deceleration of the vehicle. In the control device, a partition member is assembled in position within the valve chamber to precisely determine the initial space between the valve element and seat by an annular seal member of resilient material.

Abstract: An hydraulic brake pressure control device comprises an inertia-controlled valve for interrupting fluid communication between a master cylinder and rear wheel brake cylinders at a deceleration in excess of a predetermined value and a differential piston for gradually increasing the hydraulic pressure trapped within the wheel brake cylinders after the valve is closed. In this type of control device, resilient means is arranged to regulate axial movements of the differential piston in accordance with loaded conditions of the vehicle.

Abstract: A resilient seal cap is coupled over an upper opening of a reservoir casing to define an interior air space with the upper surface of brake fluid in the casing. The seal cap is formed integral with a first annular lip co-operating with the inner wall of the casing to provide an inlet check valve permitting the flow of air into the interior air space and with a second annular lip co-operating with a valve plate secured to the center of the casing to provide an outlet check valve permitting the flow of air out from the interior air space to the exterior.

Abstract: An hydraulic brake pressure control device includes an inertia-controlled valve adapted to control the braking pressure applied to rear wheel brake cylinders from a master cylinder in accordance with the rate of deceleration of the vehicle. In the control device, a bypass passage is provided to facilitate air-purge from the inertia-controlled valve assembly during charge of brake fluid to the braking system, and a check valve is arranged to open and close the bypass passage in such a manner that braking force distribution ratio between the front and rear wheel brake cylinders can be accorded with an ideal distribution ratio characteristic curve.

Abstract: A sealed type hydraulic reservoir including a casing for storing brake fluid therein, a cap member detachably mounted on the casing and an elastic diaphragm member dividing the casing into upper and lower chambers. The lower chamber is defined by the diaphragm member and the liquid surface, and the pressure in the lower chamber is always maintained at the level of atmospheric pressure by two check valves, one for allowing the air flow from the upper to the lower chamber when the pressure in the lower chamber drops below the atmospheric level and the other for allowing the air flow from the lower to upper chamber when the pressure in the lower chamber rises above the atmospheric level.

Abstract: A sealed type hydraulic reservoir including a check valve for normally preventing communication between a sealed chamber in which brake fluid is stored and the surrounding atmospheric environment. The check valve allows atmospheric air to flow into the sealed chamber only when the pressure in the chamber drops below atmospheric level. A second check valve may be included for allowing air flow only out of the sealed chamber when the pressure in the chamber rises above atmospheric level.

Abstract: A device of the type adapted to be interposed between rear wheel brakes of a vehicle and one of dual master cylinders for separate hydraulic circuits to the front and the rear brakes, for not only sensing axle loading and weight shift in order to optimize braking effectiveness but also permitting unrestrained passage of fluid therethrough for the purpose of compensating an accidental failure of the front brakes. The device is characterized by the fact that a load sensing spring is provided for sensing the varying load on vehicle wheels in a manner such that the load sensing spring is rather less loaded in case of the failure of the front brakes than is experienced prior to the failure.

Abstract: An apparatus for controlling hydraulic pressure delivered to brake cylinders for rear wheels of a motor vehicle in dependence on load states and deceleration thereof comprises a first hydraulic chamber communicated with a master brake cylinder operable by a brake pedal, a second hydraulic chamber communicated with the brake cylinders for the rear wheels, a communication passage for communicating the first and second hydraulic chambers with each other, a ball valve disposed in the first hydraulic chamber and adapted to be displaced under inertia to close the communication passage, and a differential piston having pressure receiving regions exposed in the first and second hydraulic chambers for controlling the rate of increase in the hydraulic pressure within the brake cylinders for the rear wheels relative to the increase in the hydraulic pressure within the master cylinder.

Abstract: In a vehicle braking system, a fluid pressure control device comprises an inertia-controlled valve for interrupting fluid communication between a master cylinder and rear wheel brake cylinders at a deceleration in excess of a predetermined value and a differential piston for gradually increasing the fluid pressure trapped within the wheel brake cylinders after the valve is closed. The control device is provided therein with a spring which is detachably engaged at opposite ends thereof with the small and large diameter portions of the piston in such a manner that the piston is urged toward an outlet chamber by engagement with the spring when moved toward an inlet chamber and also urged toward the inlet chamber by engagement with the spring when moved toward the outlet chamber.

Abstract: In an inertia-controlled valve unit, a tubular stepped spool is assembled within a stepped bore of a differential piston through a coil spring. The piston is inserted together with the spool into a stepped bore of a housing in such a manner that the spool is fixed at one end thereof to an inner wall of the housing and that the piston is slidable in relation to the spool within a small diameter portion of the housing bore. The valve unit includes a ball valve housed within a large diameter portion of the housing bore and co-operating with a valve seat provided on the other end of the spool to interrupt the flow of fluid from an inlet chamber to an outlet chamber through the spool when the ball valve is subjected to a deceleration in excess of a predetermined value.

Abstract: In a sealed fluid reservoir for a hydraulic brake master cylinder, inlet and outlet check valves are compactly assembled with a reservoir cap to constantly seal brake fluid stored in the reservoir against the surrounding air. The inlet and outlet check valves are selectively opened in response to rise or drop of the level of fluid in the reservoir to ensure smooth fluid supply to the brake master cylinder.

Abstract: A brake fluid pressure control valve of a deceleration sensing type to be interposed in the hydraulic circuit, which connects, in the hydraulic braking system for a vehicle, the master cylinder and the rear wheel cylinders, with the object of effecting a proper distribution of the braking force, in response to the load degree or condition, to each of the front and rear wheels. The control valve includes a fluid passage, a first plunger for interrupting the fluid passage, and a device for controlling the operation of the first plunger, which device includes in turn a second and a third plungers to control the operation of the first plunger in accordance with the fluid pressure given from the fluid passage via a gravity valve.

Abstract: A hydraulic brake pressure control apparatus for use with a vehicle including a housing having an inlet opening connected to a master brake cylinder and an outlet opening connected to rear wheel brake cylinders, the inlet and outlet openings being normally hydraulically communicated with each other. In the housing are disposed an inertia mass member and valve means which cooperate to control the communication between the inlet and outlet openings. Also a differential piston assembly is disposed in the housing, and a spring is mounted between the piston assembly and the inertia mass member. The inertia mass member is biased by the spring to normally engage the valve means to move the latter to an open position, and displaced against the force of the spring to thereby move the valve means to a closed position when the vehicle deceleration reaches a predetermined level.

Abstract: An inertia-controlled valve unit comprises a differential piston slidable within a stepped bore of a housing to provide first and second fluid chambers respectively in open communication with inlet and outlet ports of the housing, the piston being exposed at the smaller end thereof in the first chamber and at the larger end thereof in the second chamber.