A hydraulic lockout lever failure detection system preferably includes a first analog sensor, a second analog sensor, at least one electronic control module (ECU) and a solenoid valve. The voltage output level of the first and second analog sensors is monitored by the ECU. The solenoid valve controls the flow of hydraulic fluid to operate an excavator or other equipment. The operation of the solenoid valve is controlled by the ECU. However, a second ECU may be used to control the operation of the solenoid valve. A hydraulic lockout lever causes the first and second analog sensors to output either a low voltage to indicate a closed position, or to indicate an open position to the ECU. If the first and second analog sensors output a voltage that is above a low set value or above a high set value, a fault is detected.

In a device for locking a piston rod of a piston of an actuator, an armature rod of an electromagnet is axially movable counter to a preloading spring and includes two actuating contours. Latching mechanisms are operable to mechanically fix the piston. An axial distance between base points of the actuating contours is such that the piston is mechanically fixable by only one of the latching mechanisms in each case. Interlocking elements of both latching mechanisms are accommodated in an axially fixed manner in a sleeve, are radially displaceable, and are selectively engageable with the piston.

A hydraulic power drive unit (PDU) for a transmission system includes a hydraulic motor for converting hydraulic pressure into torque and rotation; a hydraulic brake system for applying a braking force to the hydraulic motor to prevent rotation of the hydraulic motor, wherein the hydraulic brake system is biased to apply the braking force to the hydraulic motor to prevent rotation of the hydraulic motor, and configured to remove the braking force in response to a supply of hydraulic fluid; and a hydraulic circuit for supplying a flow of hydraulic fluid to the hydraulic motor to pressurise and thereby operate the hydraulic motor and for supplying hydraulic fluid to the hydraulic brake system to pressurise the hydraulic brake system and thereby remove the braking force; wherein the hydraulic circuit comprises a brake supply line for supplying the hydraulic fluid to the hydraulic brake system.

A hydraulic power drive unit (PDU) for a transmission system includes a hydraulic motor for converting hydraulic pressure into torque and rotation; a hydraulic brake system for applying a braking force to the hydraulic motor to prevent rotation of the hydraulic motor, wherein the hydraulic brake system is biased to apply the braking force to the hydraulic motor to prevent rotation of the hydraulic motor, and configured to remove the braking force in response to a supply of hydraulic fluid; and a hydraulic circuit for supplying a flow of hydraulic fluid to the hydraulic motor to pressurise and thereby operate the hydraulic motor and for supplying hydraulic fluid to the hydraulic brake system to pressurise the hydraulic brake system and thereby remove the braking force; wherein the hydraulic circuit comprises a brake supply line for supplying the hydraulic fluid to the hydraulic brake system.

The subject matter of this specification can be embodied in, among other things, a thrust reverser synchronization shaft lock system includes a rotatable shaft comprising at least one radial prong extending radially from the shaft, a hydraulic lock assembly that includes a housing, a piston head having a lock recess, a piston rod extending radially away from the shaft and configured to be urged by the piston head to move the first piston rod end out of engagement with the radial prong to selectably permit rotation of the shaft, and a bias member configured to urge the first piston rod end into engagement with the radial prong, and an electric lock assembly that includes a lock pin and an electric actuator configured to controllably extend and retract the lock pin in and out of engagement with the lock recess.

An integrated pump device includes a motor, an oil pump rotated by a driving force of the motor and configured to discharge oil drawn from an oil pan, and a hydraulic actuator configured to switch between an advance state and a retard state by a hydraulic pressure created by the oil pump. The hydraulic actuator is a parking lock actuator, and includes a housing having vane chambers and a vane rotor housed in the housing and including vanes arranged in the vane chambers. The vane rotor is configured to rotate to enter the advance state when the hydraulic pressure is supplied to an advance chamber, and to rotate to enter the retard state when the hydraulic pressure is supplied to a retard chamber. The parking lock actuator locks a parking lock mechanism at the advance state, and unlocks the parking lock mechanism at the retard state.

An integrated pump device includes a motor, an oil pump rotated by a driving force of the motor and configured to discharge oil drawn from an oil pan, and a hydraulic actuator configured to switch between an advance state and a retard state by a hydraulic pressure created by the oil pump. The hydraulic actuator is a parking lock actuator, and includes a housing having vane chambers and a vane rotor housed in the housing and including vanes arranged in the vane chambers. The vane rotor is configured to rotate to enter the advance state when the hydraulic pressure is supplied to an advance chamber, and to rotate to enter the retard state when the hydraulic pressure is supplied to a retard chamber. The parking lock actuator locks a parking lock mechanism at the advance state, and unlocks the parking lock mechanism at the retard state.

The object of the invention of the present application resides in provision of a work machine that can be improved in operability at start of an action of a hydraulic actuator in a fine operation in which an operation lever is operated by a small amount. To this end, on the basis of a signal from a first timing sensor and a signal from a second timing sensor, a machine body controller controls, before the first timing is sensed, the pump delivery flow rate to a minimum delivery flow rate, controls, after the first timing is sensed but before the second timing is sensed, the pump delivery flow rate to a predetermined delivery flow rate that is greater than the minimum delivery flow rate, and controls, after the second timing is sensed, the pump delivery flow rate to a delivery flow rate according to an operation amount of the operation lever.

The object of the invention of the present application resides in provision of a work machine that can be improved in operability at start of an action of a hydraulic actuator in a fine operation in which an operation lever is operated by a small amount. To this end, on the basis of a signal from a first timing sensor and a signal from a second timing sensor, a machine body controller controls, before the first timing is sensed, the pump delivery flow rate to a minimum delivery flow rate, controls, after the first timing is sensed but before the second timing is sensed, the pump delivery flow rate to a predetermined delivery flow rate that is greater than the minimum delivery flow rate, and controls, after the second timing is sensed, the pump delivery flow rate to a delivery flow rate according to an operation amount of the operation lever.

A hydraulic apparatus is disclosed, which includes a hydraulic cylinder body, a piston, a push assembly, and a first sealing component; the hydraulic cylinder body is of a hollow cylinder shape, provided with a first opening and a second opening respectively at two ends; the piston is disposed in the hydraulic cylinder body and is located at the first opening; the first sealing component covers the second opening; the hydraulic cylinder body, the piston, and the first sealing component are configured to form a hydraulic chamber; the hydraulic cylinder body is provided with a liquid flow opening which is located between the first sealing component and the piston; and the piston is configured to be enabled to move in the hydraulic cylinder body, driven by the push assembly.