Work machine

A work machine comprising:

• a lower traveling body;
• an upper turning body mounted on the lower traveling body so as to be turnable;
• a work attachment mounted on the upper turning body;
• a work actuator that is driven, by supply of hydraulic fluid to the work actuator, to cause the work attachment to make a specific work motion;
• a turning motor that is driven, by supply of hydraulic fluid to the turning motor, to cause the upper turning body to make a turning motion;
• a first pump that discharges hydraulic fluid;
• a second pump that discharges hydraulic fluid separately from the first pump;
• a work operation part that is operated, by a work operation applied to the work operation part for causing the work attachment to make a specific work motion, to output a work command corresponding to a work operation amount that is a magnitude of the work operation;
• a turning operation part that is operated, by a turning operation applied to the turning operation part for causing the upper turning body to make a specific turning motion, to output a turning command corresponding to the turning operation;
• a first work actuator control valve provided between the first pump and the work actuator and connected to the work operation part to be opened and closed by input of the work command to the first work actuator control valve so as to change a flow rate of hydraulic fluid supplied from the first pump to the work actuator in accordance with the work command;
• a second work actuator control valve provided between the second pump and the work actuator and connected to the work operation part to be opened and closed by input of the work command to the second work actuator control valve so as to change a flow rate of hydraulic fluid supplied from the second pump to the work actuator in accordance with the work command;
• a turning control valve provided between the second pump and the turning motor and connected to the turning operation part to be opened and closed by input of the turning command to the turning control valve so as to change a flow rate of hydraulic fluid supplied from the second pump to the turning motor;
• a work command adjuster that is operated, by input of a work adjustment command to the work command adjuster, to change a magnitude of the work command to be input from the work operation part to the second work actuator control valve in accordance with the work adjustment command;
• and
• a controller including an adjustment command part that generates the work adjustment command and inputs the work adjustment command to the work command adjuster,
• wherein the adjustment command part is configured to perform an asynchronization control of the work actuator control valves by generating the work adjustment command to render a second minimum operation amount of the second work actuator control valve with respect to the work operation amount greater than a first minimum operation amount of the first work actuator control valve and to input the work adjustment command to the work command adjuster in a single work operation state where the work operation is applied to the work operation part whereas the turning operation is not applied to the turning operation part,
• wherein the adjustment command part is configured to perform a synchronization control of the work actuator control valves by generating the work adjustment command to render the second minimum operation amount of the second work actuator control valve equal to the first minimum operation amount of the first work actuator control valve and to input the work adjustment command to the work command adjuster at least when the turning operation is a turning deceleration operation for decelerating the turning motion in a combination operation state where the work operation is applied to the work operation part and simultaneously the turning operation is applied to the turning operation part, and
• wherein the first minimum operation amount is a minimum operation amount of the work operation amount to allow the first work actuator control valve to be shifted from a valve opened state to a fully closed state, and the second minimum operation amount is a minimum amount of the work operation amount to allow the second work actuator control valve to be shifted from a valve opened state to a fully closed state.