Patent ID: 7591214
Filing Date: 2009-09-22
Classification: E02F

Abstract:
1. A driving motor controlling device of a construction machine, comprising: a driving motor which is connected to a pump and a tank through a swivel joint; and a motor control valve which switches a state for connecting the pump and the tank to the driving motor such that the driving motor is controlled to a stop state, a normal rotation state, or a reverse rotation state; wherein the motor control valve has a neutral position for the stop state, a normal rotation position for the normal rotation state, and a reverse rotation position for the reverse rotation state, and is switched to the neutral position, the normal rotation position, or the reverse rotation position, based on a command from a control device manipulated by a operator and a pressure of an inflow side of hydraulic oil into the driving motor; wherein the driving motor controlling device further comprises: wherein the remote control valve is connected to the first pilot chamber though the starting passage until the pilot pressure control valve is switched to the feed position, and the starting passage is blocked by the motor control valve when the pilot pressure control valve is switched to the feed position.