Patent ID: 7370475
Filing Date: 2008-05-13
Classification: B60W,B66F,E02F,F04B,F16H

Abstract:
1. A traveling hydraulic working machine comprising at least one prime mover, a machine body mounting said prime mover thereon, traveling means provided in said machine body and including a torque converter coupled to said prime mover, a variable displacement hydraulic pump driven by said prime mover, at least one working actuator operated by a hydraulic fluid from said hydraulic pump, and an operating device for generating an operation signal to control said working actuator, wherein said traveling hydraulic working machine further comprises: first detecting means for detecting whether the sum of absorption torque of said hydraulic pump and travel torque of said traveling means exceeds output torque of said prime mover; second detecting means for detecting an operating situation of said traveling means; and pump torque modifying means for modifying maximum absorption torque of said hydraulic pump depending on the operating situation of said traveling means detected by said second detecting means when said first detecting means detects that the sum of the absorption torque of said hydraulic pump and the travel torque exceeds the output torque of said prime mover, wherein said first detecting means produces a modification torque when said first detecting means detects that the sum of the absorption torque of said hydraulic pump and the travel torque exceeds the output torque of said prime mover, and said pump torque modifying means comprises first means for modifying the modification torque depending on the operating situation of said traveling means detected by said second detecting means, and second means for controlling the maximum absorption torque of said hydraulic pump to be reduced by an amount corresponding to the modification torque modified by said second means.