A fail-safe drive (1) for an actuating drive is provided, which has a cam disc (8), at least one restoring element, a counter-element (5) and an output shaft (3), with the cam disc (8) and the counter-element (5) being configured for joint conversion of an axial movement of the restoring element along the output shaft (3) into a rotational movement of the output shaft (3). The cam disc (8) has a control cam (10), the profile of which is adapted to a spring characteristic curve of the restoring element such that, in the case of activation of the failsafe drive (1), a constant output movement and/or a constant output torque can be generated.

A fluid control device includes: a valve body accommodating chamber having an inner space divided into a first chamber and a second chamber by a first valve body; a receiving port, which opens to the first chamber and through which a fluid from an accumulator is received in the first chamber, and a discharge port, which opens to the first chamber and through which the fluid is discharged from the first chamber; a guide path guiding the fluid from the accumulator to the second chamber such that the first valve body moves to a valve-closed position to close the discharge port; a second valve body switchable between a state of maintaining pressure of the fluid guided to the second chamber and a state of releasing the pressure; and a bias member biasing the first valve body to the valve-closed position.

According to the present invention, a hydraulic system of construction equipment is implemented as a close center system, which converts an input signal of an electric or hydraulic joystick into a speed signal of a work apparatus, and controls a speed of the work apparatus regardless of an external load condition, thereby minimizing fatigue of a worker to improve work efficiency, improving a work apparatus operation ability of an unskilled person, and patterning standardized work to implement automation of construction equipment.

A working machine includes a controller to perform automatic deceleration to automatically reduce a first rotation speed of a left traveling motor to output a power to a left traveling device on a left portion of a machine body and a second rotation speed of a right traveling motor to output a power to a right traveling device on a right portion of the machine body by shifting a speed stage of each of the left and right traveling motors from a second speed to a first speed that is lower than the second speed. The controller is configured or programmed to determine, based on the second rotation speed, a left threshold for judging whether to perform the automatic deceleration in left pivot turn of the machine body, and to determine, based on the first rotation speed, a right threshold for judging whether to perform the automatic deceleration in right pivot turn of the machine body.

A working machine includes a controller to perform automatic deceleration to automatically reduce a first rotation speed of a left traveling motor to output a power to a left traveling device on a left portion of a machine body and a second rotation speed of a right traveling motor to output a power to a right traveling device on a right portion of the machine body by shifting a speed stage of each of the left and right traveling motors from a second speed to a first speed that is lower than the second speed. The controller is configured or programmed to determine, based on the second rotation speed, a left threshold for judging whether to perform the automatic deceleration in left pivot turn of the machine body, and to determine, based on the first rotation speed, a right threshold for judging whether to perform the automatic deceleration in right pivot turn of the machine body.

One variation of a dynamic tactile interface includes: a dynamic tactile layer including a deformable region and a first region, the deformable region operable between a retracted setting and an expanded setting, the first region adjacent the deformable region, the deformable region tactilely distinguishable from the first region in the expanded setting; a displacement device including a fluid vessel and an actuator, the actuator displacing fluid from the fluid vessel into the dynamic tactile layer to transition the deformable region from the retracted setting into the expanded setting and displacing fluid from the dynamic tactile layer into the fluid vessel, transitioning the deformable region from the expanded setting into the retracted setting; and a fluid compensation device coupled to the displacement device and adjusting a configuration of the displacement device in response to a change in a volume of fluid contained within the fluid vessel.

A hydraulics assembly, in particular for controlling the brake pressure of a wheel brake of an electronically slip-controllable brake system of a motor vehicle, includes a hydraulic block having a recess for receiving a pump element, a line connection for contacting the hydraulics assembly to the wheel brake, channels for providing the pump element with brake fluid, and a hydraulic cavity formed in the interior of the hydraulic block, which cavity is contacted with the recess for the pump element. The cavity includes a riser, which extends from the recess for the pump element in the direction toward the line connection of the hydraulic block and is contacted with the recess for the pump element. The suction line collects gas escaping from the pressure means due to temperature and/or pressure changes and improves the operating noise of the hydraulics assembly.

A hydraulics assembly, in particular for controlling the brake pressure of a wheel brake of an electronically slip-controllable brake system of a motor vehicle, includes a hydraulic block having a recess for receiving a pump element, a line connection for contacting the hydraulics assembly to the wheel brake, channels for providing the pump element with brake fluid, and a hydraulic cavity formed in the interior of the hydraulic block, which cavity is contacted with the recess for the pump element. The cavity includes a riser, which extends from the recess for the pump element in the direction toward the line connection of the hydraulic block and is contacted with the recess for the pump element. The suction line collects gas escaping from the pressure means due to temperature and/or pressure changes and improves the operating noise of the hydraulics assembly.

A hydraulic drive system includes: a first hydraulic pump of the variable capacitance type; a first regulator including a first proportional valve; a second hydraulic pump that dispenses operating oil; a switch valve; a control device; and a malfunction detection device. The switch valve can switch to a third valve position in which the switch valve allows the operating oil dispensed from both the first hydraulic pump and the second hydraulic pump to be supplied to first and second traveling hydraulic motors and first and second hydraulic actuators. The control device controls the operation of the first proportional valve by outputting a first flow rate command signal to the first proportional valve, and when the malfunction detection device detects a malfunction of an electrical system related to the first proportional valve, the control device switches the switch valve to the third valve position.

A hydraulic drive system includes: a first hydraulic pump of the variable capacitance type; a first regulator including a first proportional valve; a second hydraulic pump that dispenses operating oil; a switch valve; a control device; and a malfunction detection device. The switch valve can switch to a third valve position in which the switch valve allows the operating oil dispensed from both the first hydraulic pump and the second hydraulic pump to be supplied to first and second traveling hydraulic motors and first and second hydraulic actuators. The control device controls the operation of the first proportional valve by outputting a first flow rate command signal to the first proportional valve, and when the malfunction detection device detects a malfunction of an electrical system related to the first proportional valve, the control device switches the switch valve to the third valve position.