Patent ID: 9708167
Date: 2017-07-18
CPC Classifications: B66F,F15B

Claim:
1. An industrial vehicle comprising: a hydraulic brake device; a hydraulic load handling device; a first hydraulic circuit including a hydraulic accumulator, which is a hydraulic pressure source for the brake device, and a detector, which is configured to detect a pressure accumulation state of the hydraulic accumulator; a first oil passage, which connects the first hydraulic circuit and a hydraulic pump to each other; a second hydraulic circuit having a closed center type control valve, which disconnects the hydraulic pump and the load handling device from each other when a load manipulating section is unmanipulated, wherein the second hydraulic circuit switches supply/drainage of hydraulic oil by using the control valve, thereby actuating the load handling device; a second oil passage, which connects the second hydraulic circuit and the hydraulic pump to each other; a pressure compensating circuit having a pressure compensating valve and an electromagnetic valve, wherein the pressure compensating valve is located in a third oil passage, which connects the hydraulic pump and the oil tank to each other without the second hydraulic pump, and the electromagnetic valve is located in a fourth oil passage, which connects the hydraulic pump and the pressure compensating valve to each other; and a controller, wherein the electromagnetic valve is configured to be switched between a first position and a second position through control by the controller, wherein, at the first position, the electromagnetic valve disconnects the hydraulic pump and the pressure compensating valve from each other, and, at the second position, the electromagnetic valve connects the hydraulic pump and the pressure compensating valve to each other, the controller is configured to when the electromagnetic valve is set to the second position, hydraulic pressure generated by driving the hydraulic pump is applied to the pressure compensating valve and produces a force acting in a direction to disconnect the hydraulic pump and the oil tank from each other, so that hydraulic pressure is generated in the first oil passage to be accumulated in the hydraulic accumulator.