| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cargo-handling hydraulic circuit device for a forklift, which can eliminate power loss for prevention of occurrence of cavitation by preventing a drive motor of an air compressor from being wastefully driven to prevent the occurrence of the cavitation. <P>SOLUTION: The cargo-handling hydraulic circuit device includes position detecting switches 14d and 19d for detecting a position of each of cylinders 14 and 19, and pressure switches PS and RPS for detecting internal pressure of each of closed oil tanks T and RT. The cargo-handling hydraulic circuit device also includes the air compressor 36 for pressurizing the inside of each of the closed oil tanks T and RT, and the drive motor 36a. When the position detecting switches 14d and 19d detect that each of the cylinders 14 and 19 is located in a top position and the pressure switches PS and RPS detect that internal pressure of each of the closed oil tanks T and RT becomes lower than pressure slightly higher than atmospheric pressure, a control mechanism 60 drives the drive motor 36a to pressurize the insides of the closed oil tanks T and RT. <P>COPYRIGHT: (C)2012,JPO&INPIT |
