Patent ID: 7318463

Claim:
A self-propelled crushing machine for crushing target materials to be crushed, wherein the machine comprises: a crushing device; a hydraulic drive system including a crushing device hydraulic motor for driving said crushing device, at least one first hydraulic pump for driving said crushing device hydraulic motor, and a prime mover for driving said first hydraulic pump; crushing device load detecting means for detecting a load condition of said crushing device; and first control means for executing control to increase a revolution speed of said prime mover in accordance with a detected signal from said crushing device load detecting means; wherein the machine further comprises at least one auxiliary for performing work related to crushing work performed by said crushing device; and wherein said hydraulic drive system includes an auxiliary hydraulic actuator for driving said auxiliary, and a second hydraulic pump for driving said auxiliary hydraulic actuator, said prime mover driving said first hydraulic pump and said second hydraulic pump; said crushing device load detecting means includes first delivery pressure detecting means for detecting a delivery pressure of said first hydraulic pump, and second delivery pressure detecting means for detecting a delivery pressure of said second hydraulic pump; and said first control means controls the delivery rates of said first hydraulic pump and said second hydraulic pump in accordance with a detected signal from said first delivery pressure detecting means and a detected signal from said second delivery pressure detecting means such that a total of input torques of said first hydraulic pump and said second hydraulic pump is held not larger than an output torque of said prime mover, and executes the control to increase the revolution speed of said prime mover in accordance with the detected signals from said first delivery pressure detecting means and said second delivery pressure detecting means.