摘要:
A pair of spaced apart large-diameter and small-diameter lands between which a fluid chamber is defined are formed on a second piston in a tandem cylinder to which an anti-skid device is added. Booster pressure is applied to the fluid chamber to act on the large-diameter land in a manner fluidly locking the second piston against movement despite a reduction in pressure in the first and second pressure chambers during operation of the anti-skid device. As a result, the movement of the brake pedal in the normal direction of depression is prevented when the anti-skid devices operates.
摘要:
A hydraulic brake system includes a master cylinder for generating a brake fluid pressure in response to a brake pedal, a power fluid source for generating a power fluid pressure by increasing a brake fluid to a predetermined pressure. A dynamic fluid pressure control apparatus supplies the brake fluid pressure to regulate the power fluid pressure from the power fluid pressure source in response to the brake pedal. A plurality of wheel cylinders of each wheel for the vehicle are fluidically communicated with a dynamic fluid pressure control apparatus and the master cylinder via a fluid passage separated into plural control systems. A first changeover valve fluidically and selectively communicates at least one system of the wheel cylinder with one of the dynamic fluid pressure control apparatus and the master cylinder and a control valve disposed in a fluid passage communicates the first changeover valve and the wheel cylinder controls the brake fluid pressure supplied to the wheel cylinder by opening and closing the fluid passage in accordance with the slip state of the wheel upon braking. A control circuit controls the actuation of the control valve and the first changeover valve, and a second changeover valve is disposed in a fluid passage fluidically communicating the first changeover valve and the dynamic fluid pressure control apparatus and selectively communicates the fluid passage with one of the dynamic fluid pressure control apparatus and the power fluid pressure source.
摘要:
A disc brake device includes a disc rotor, which rotates around a rotation axis, friction pads opposed to friction surfaces of the disc rotor, a first member provided on a fixed part on a vehicle body side, a second member supported so as to be slidable relative to the first member by a slide mechanism, a third member, which holds the friction pads and is supported so as to be swingable relative to the second member around a swing axis in a radial direction of the disc rotor as a center of swing by a swing mechanism, and a return mechanism provided on the swing mechanism to apply force to the third member to restore the same to an initial position in a swing direction. Therefore, the disc brake device has an effect of inhibiting abnormal noise.
摘要:
A disc brake device includes a disc rotor, which rotates around a rotation axis, friction pads opposed to friction surfaces of the disc rotor, a first member provided on a fixed part on a vehicle body side, a second member supported so as to be slidable relative to the first member by a slide mechanism, a third member, which holds the friction pads and is supported so as to be swingable relative to the second member around a swing axis in a radial direction of the disc rotor as a center of swing by a swing mechanism, and a return mechanism provided on the swing mechanism to apply force to the third member to restore the same to an initial position in a swing direction. Therefore, the disc brake device has an effect of inhibiting abnormal noise.
摘要:
A gas vane pump wherein a lubricant is intermittently introduced into a housing during rotation of a rotor, through a supply passage formed through the housing and the rotor, and the relative position between the rotor having a diametric hole and the housing having a communication groove is determined such that when the rotor is at an angular position in the middle of a predetermined angular range relative to the housing and the hole is in communication with the groove, a point of contact between a vane movably held by the rotor and the inner circumferential surface of the housing is located at the lowest position of the inner circumferential surface. When the rotor is stopped within the predetermined angular range, the vane divides the remaining lubricant into two portions, which are discharged at different times, making it possible to reduce the load on the vane upon restarting the pump.
摘要:
A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a hydraulic booster for actuating the master cylinder in response to depression of a brake pedal and a plurality of wheel brake cylinders for braking respective road wheels, which are divided into a first group of wheel brake cylinders communicating with the master cylinder and a second group of wheel brake cylinders communicating with the hydraulic booster. An auxiliary cylinder is disposed between the master cylinder and the first group of wheel brake cylinders to which a hydraulic braking pressure from the master cylinder is directly applied in its inoperative condition, and it increases the hydraulic braking pressure in response to depression of the brake pedal in its operative condition which is made when the hydraulic power pressure, for example, is less than the hydraulic braking pressure by a predetermined difference. Control structure is connected to the auxiliary cylinder and allows the auxiliary cylinder in its operative condition when the hydraulic braking pressure, for example, is less than a predetermined value.
摘要:
A disc brake device is characterized by including a disc rotor that rotates around a rotational axis, a friction pad that opposes a friction surface of the disc rotor, a first member provided on a fixed portion on a vehicle body side, a second member that is slidably supported via a slide mechanism with respect to the first member, and a third member that holds the friction pad, and is pivotally supported, with a pivot axis along a radial direction of the disc rotor as a pivot center, via a pivot mechanism with respect to the second member.
摘要:
A gas vane pump wherein a lubricant is intermittently introduced into a housing 10 during rotation of a rotor 40, through a lubricant supply passage 100 formed through the housing and the rotor, and the relative position between the rotor having a diametric hole 112 and the housing having a communication groove 130 is determined such that when the rotor 40 is placed at an angular position which is in the middle of a predetermined angular range relative to the housing 10 and in which the hole 112 is in communication with the groove 130, a point of contact between a vane 70 movably held by the rotor and the inner circumferential surface of the housing 10 is located at the lowest position of the inner circumferential surface, so that when the rotor 40 is stopped at an angular position within the predetermined angular range, the vane 70 divides the remaining lubricant mass into two portions, which are discharged at respective two different times one after the other, making it possible to reduce the load acting on the vane upon restarting of the vane pump.
摘要:
A hydraulic braking system includes a tandem master cylinder having a bore with an opening and a closed wall at opposite ends thereof which formed in a housing, a first piston slidably fitted in the bore so as to define a first pressure chamber and a first fluid chamber therein and operatively connected to a brake pedal, a second piston slidably fitted in the bore so as to define a second fluid chamber adjacent to the first pressure chamber and a second pressure chamber and operatively connected to the first piston. A normally open valve communicates with each piston so as to close passages formed in the each pistons and communication between each fluid chambers and each pressure chambers, respectively, when each piston is moved in response to the depression of the brake pedal. A power source generates a hydraulic power pressure. A dynamic hydraulic braking pressure generator generates the hydraulic power pressure supplied from the power source in response to depression of the brake pedal and outputs to the second fluid chamber. A plurality of wheel cylinders for braking respective road wheels are divided into a first group of wheel brake cylinders communicated with the first pressure chamber through one of dual hydraulic circuits and a second group of wheel brake cylinders communicate with the second pressure chamber through an another of the dual hydraulic circuits. A restrictor restricts the sliding distance of the second piston toward the first piston to at least a predetermined distance for closing the valve means. Due to such construction, the first stage idle stroke of the tandem master cylinder is shortened and the stroke of the brake pedal is shortened.
摘要:
A tandem master brake cylinder has first and second pistons, each piston associated with a fluid chamber and a pressure chamber. The pistons are displaced in response to actuation of a brake pedal. A hydraulic booster is coupled to a power source and is operable to enhance the piston movement and for conducting pressurized fluid to a second of the fluid chambers associated with a second piston to displace that piston in a manner reducing the volume of the pressure chamber associated with the first piston. In the event that a negative pressure is communicated with the second fluid chamber, e.g. by a loss of pressurized fluid from the power source, brake fluid is supplied through a one-way check valve to the second fluid chamber to prevent the negative pressure from reversing the motion of the second piston.