A drilling tool, in particular a rock drilling tool, for a portable machine tool, includes a drill head, in particular a hard metal drill head. The drill head includes a drill shaft connected, in particular integrally with the drill head, and a rotational axis. The drill shaft is configured as one piece, has a guide section with guide groove winding in a spiral-shaped about the drill shaft for transporting away drilling dust, and has a securing section provided for detachably securing the drilling tool to a machine tool. The guide section has a diameter reinforcement at a drill head support region of the guide section neighboring, in particular adjacent to, the drill head.

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 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 hydraulic vehicle braking system comprises a master cylinder having at least one piston displacably accommodated therein, a mechanical actuator that is coupled, or can be coupled, to a brake pedal for actuating the piston, and an electromechanical actuator. The electromechanical actuator is likewise provided for actuating the piston and can be activated, at least for boosting or generating brake force, when the brake pedal is actuated. Furthermore, a valve arrangement is provided, which has a first valve per wheel brake for selectively uncoupling the wheel brake from the master cylinder, and a second valve for selectively reducing the brake pressure at the wheel brake. The valve arrangement can be controlled at least within the framework of an ABS control mode.

A hydraulic vehicle braking system comprises a master cylinder having at least one piston displacably accommodated therein, a mechanical actuator that is coupled, or can be coupled, to a brake pedal for actuating the piston, and an electromechanical actuator. The electromechanical actuator is likewise provided for actuating the piston and can be activated, at least for boosting or generating brake force, when the brake pedal is actuated. Furthermore, a valve arrangement is provided, which has a first valve per wheel brake for selectively uncoupling the wheel brake from the master cylinder, and a second valve for selectively reducing the brake pressure at the wheel brake. The valve arrangement can be controlled at least within the framework of an ABS control mode.

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 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.

According to one embodiment, for example, when it is determined that a certain condition has been satisfied while first antilock control is being executed, a controller of a brake control apparatus executes second antilock control by opening and closing a solenoid valve with a motor stopped so that brake fluid of the wheel cylinder is caused to flow into a reservoir, the second antilock control including a second pressure reduction mode, the second pressure reduction mode reducing a pressure of a wheel cylinder while substantially equilibrating the pressure of the wheel cylinder and a pressure of the reservoir at a certain pressure or larger, the certain pressure being larger than zero.

According to one embodiment, for example, when it is determined that a certain condition has been satisfied while first antilock control is being executed, a controller of a brake control apparatus executes second antilock control by opening and closing a solenoid valve with a motor stopped so that brake fluid of the wheel cylinder is caused to flow into a reservoir, the second antilock control including a second pressure reduction mode, the second pressure reduction mode reducing a pressure of a wheel cylinder while substantially equilibrating the pressure of the wheel cylinder and a pressure of the reservoir at a certain pressure or larger, the certain pressure being larger than zero.

The invention obtains a hydraulic brake system, installability of which in a bicycle is improved. The invention also obtains a bicycle that includes such a hydraulic brake system. The invention further obtains a method for controlling such a hydraulic brake system.

A hydraulic brake system 100 includes a hydraulic pressure controller 100 and a power supply unit 150 of the hydraulic pressure controller 100, the hydraulic pressure controller 100 including: a base section that is formed with a channel, through which a brake fluid flows, therein; a valve that is attached to the base section and opens and closes the channel; and a control section that governs an opening/closing operation of the valve and controlling hydraulic pressure of the brake fluid that is supplied to a wheel braking section of the bicycle. The power supply unit 150 includes a generator 151 that generates electric power by traveling of a bicycle 200.