STRAIGHT MOVEMENT CONTROLLING APPARATUS OF CRAWLER-TYPE EXCAVATOR AND METHOD THEREOF

摘要

According to the present invention, there is provided a variable capacity type hydraulic pump, comprising: a variable capacity type 1/2 hydraulic pump; a 1/2 traveling motor operated by receiving a flow rate from the first hydraulic pump; A first half working machine which is operated by receiving a flow rate from the second hydraulic pump, and a second half working device which is supplied from the second hydraulic pump to the 1/2 work device A second hydraulic pump for supplying a flow rate to the first 1/2 motor via the 1/2 hydraulic motor switching valve, and a second hydraulic pump for supplying hydraulic oil to the second hydraulic pump, A traveling rectilinear valve for supplying the flow rate to the 1/2 of the working device through the 1/2 work device switching valve to secure the traveling straightness of the excavator during the simultaneous operation of the 1/2 traveling motor and the 1/2 working device, A connection is made on the hydraulic line of the 1/2 drive motor and the 1/2 drive motor switching valve A 1/2 flow rate sensor for detecting the flow rate supplied in response to the pilot pressure generated from the travel control device, An electronic proportional pressure reducing valve for transmitting the pilot pressure to the traveling motor switching valve so that the first and second traveling motors are supplied with the corresponding hydraulic pressure from the first hydraulic pump; And a controller for controlling the electron proportional pressure reducing valve so that the same flow rate is delivered to the 1/2 traveling motor even if another load is transmitted to the 1/2 traveling motor in the case of a signal for causing the excavator to travel straight ahead. A running control device is provided.;