A braking system for vehicles may have a pilot pump fluidically connected to a hydraulic actuator device. The hydraulic actuator device has a by-pass, configured to connect or disconnect fluidically a first actuation chamber and a delivery duct, where a movable septum is connected to a motor device. The movable septum places the first actuation chamber in communication with the by-pass and with a second actuation chamber, to a braking correction condition. The motor device is activated to translate the movable septum so that the first actuation chamber is fluidically separated from the by-pass and from the second actuation chamber. The second actuation chamber, fluidically connected to the delivery duct, controls the actuation of the braking device, excluding the action imposed by the user through the fluid under pressure in the first actuation chamber.

A pressure modulator for an anti-lock braking system of a bicycle. The pressure modulator includes a cylinder, and a piston having a through opening for hydraulic fluid, the piston being situated inside the cylinder and subdividing the cylinder into a first accumulator chamber and a second accumulator chamber, the first and second accumulator chambers being connectable to each other via the through opening. The pressure modulator further includes a valve system, which includes a closing element and an actuating device for the closing element, the closing element being situated in the through opening, and the actuating device being situated at a bottom of the cylinder, and an actuator for moving the piston.

A hydraulic actuator for supplying a hydraulic brake pressure to service brakes of a vehicle includes an actuator cylinder including a piston. A hydraulic working pressure of a brake fluid can be set in accordance with a position of the piston. The brake fluid is supplied from a hydraulic reservoir assigned to the hydraulic cylinder, and the hydraulic working pressure prevails in a working space of the actuator cylinder and can be output via an actuator output port on the actuator cylinder in order to supply a hydraulic brake pressure in accordance with the hydraulic working pressure. The hydraulic actuator further includes an electrically controllable motor. A rotary motion brought about by the electrically controllable motor can be converted by a conversion mechanism into a translational motion of the piston parallel to a longitudinal direction thus enabling a hydraulic brake pressure to be supplied by electric control of the motor.

An electromechanical actuator for use in a hydraulic braking circuit of a vehicle comprises an electric motor having a stator and a rotor, and a linear actuator that is located within the motor. The linear actuator comprises an elongate shaft having a screw part at one end carrying an external thread that extends along a portion of the shaft, and a fixing part at the other end shaft, the linear actuator further comprising a drive nut that surrounds the screw part of the shaft and is located at least in a retracted position inside an enlarged bore of the first portion of the rotor body, the drive nut being connected to the screw part through a set of balls that engage the threads of the drive nut and screw part, and the fixing part of the shaft includes a tapering portion that engages a complimentary tapering portion of the bore in the second portion of the rotor body.

The braking system includes a first and a second braking actuators associated with wheels of a respective axle or a respective bogie of a railway vehicle and to which there are connected a first electro-pneumatic control assembly and a second electro-pneumatic control assembly respectively, each comprising a charging solenoid valve and a discharging solenoid valve adapted to cause an increase and a reduction, respectively, of a pneumatic pressure supplied to the corresponding braking actuators, and a control unit arranged to control the electro-pneumatic control assemblies as a function of a target braking pressure, so that the assemblies cause the application of respective pressures to the corresponding braking actuators.

A braking system for vehicles comprising a pilot pump provided with a manual actuation means, the pilot pump being fluidically connected to a hydraulic actuator device in turn operatively connected to a braking device associated with a wheel of said vehicle, wherein the hydraulic actuator device delimits a first and a second actuation chamber fluidically separated by a movable septum along an axial direction X-X, the first actuation chamber containing fluid pressurized by the pilot pump, the second actuation chamber being filled with fluid under pressure and being provided with a delivery duct fluidically connected to said braking device. Advantageously, the hydraulic actuator device comprises a by-pass, offset axially with respect to said delivery duct and fluidically connected with the latter, the movable septum being connected to motor means in order to translate axially, independently of the braking action imposed through the manual actuation means of the pilot pump, the system comprising a processing unit and control operatively connected with the motor means and programmed so as to pass from a condition of standard operation or deactivation of the motor means, in which the movable septum connects the first actuation chamber with the by-pass and with the second actuation chamber, to a braking correction condition in which the motor means are activated to move the movable septum so that the first actuation chamber is fluidically separated from the by-pass and the second actuation chamber. In this way, the second actuation chamber, fluidically connected to the delivery duct, commands the actuation of the braking device, excluding the action imposed by the user through the pressurized fluid in the first actuation chamber.

Disclosed herein is an electric brake system including: a hydraulic feeder configured to move a piston forward or backward according to a pedal effort from a brake pedal to discharge oil; a motor position sensor configured to measure a position of the piston; and a controller configured to control, when an Anti-lock Brake System (ABS) control starts, a change in direction of the piston based on predicted displacement information of the piston while the ABS control is performed such that the piston is at a target position at target vehicle speed.

A pressure modulator for an antilock braking system (ABS) has a housing with a hydraulic inlet and a hydraulic outlet, the hydraulic inlet and outlet interconnected via a hydraulic line; a volume accumulator arranged to be opened against a spring force of a spring element and which increases a volume of the hydraulic line during an activated anti-lock function. A linear drive is provided with a rotor bar, where a displacement movement of the rotor bar effectuates an opening of the volume accumulator. The spring element is supported at least indirectly on the housing and the rotor bar, where the spring element is disposed in the rotor bar.

A pressure modulator for an ABS system includes a housing that which has a hydraulic inlet and a hydraulic outlet that are interconnected via a hydraulic line; a volume accumulator that increases a volume of the hydraulic line during an activated anti-lock function, a linear drive for opening the volume accumulator and an electronic circuit that controls the linear drive and is disposed in the housing.

A braking system with function of anti-somersault, comprising: a hydraulic unit, a piston, a drive unit, a suspension travel sensor, and an ECU. During braking, according to a suspension travel signal generated by the suspension travel sensor, the ECU is able to determine whether a vehicle with short wheel base and high centre of gravity tends to be subject to forward somersault or not. Once confirmed, the ECU immediately sends a control signal to the drive unit, so as to drive the piston move towards a pressure releasing direction, such that fluid pressure on the downstream side of the hydraulic unit is blocked from changing. Moreover, further increase of the piston's displacement increases fluid volume in an oil chamber of the hydraulic unit so as to largely reduce the downstream fluid pressure. Consequently, braking force applied to the vehicle by the braking caliper decreases, and the forward somersault is prevented.