Hydraulic brake device for industrial vehicle

A hydraulic brake device for an industrial vehicle comprising:

• a hydraulic pressure generator configured to generate hydraulic pressure;
• a brake unit configured to generate a braking force;
• a hydraulic fluid passage through which the hydraulic pressure generator and the brake unit are connected to each other;
• and
• a cylinder mechanism having a cylinder hydraulic fluid chamber and provided in the hydraulic fluid passage,
• the hydraulic brake device being configured to release the braking force of the brake unit by using the hydraulic pressure from the hydraulic pressure generator and configured to cause the brake unit to generate the braking force by releasing the hydraulic pressure in the hydraulic fluid passage,
• the hydraulic fluid passage including:
• a first hydraulic fluid passage portion through which the hydraulic pressure generator and the cylinder hydraulic fluid chamber are connected to each other;
• and
• a second hydraulic fluid passage portion through which the cylinder hydraulic fluid chamber and the brake unit are connected to each other,
• the cylinder mechanism including:
• a cylinder having a cylinder chamber;
• a cylinder cover that closes an opening of the cylinder;
• a piston that is reciprocally movable in the cylinder chamber;
• a piston rod that is coupled to the piston and that extends out from the cylinder chamber to an outside of the cylinder;
• and
• a blocking member that blocks the cylinder hydraulic fluid chamber from the first hydraulic fluid passage portion depending on a position of the piston relative to the cylinder, and
• the cylinder hydraulic fluid chamber being defined by the cylinder and the piston, wherein
• the piston rod has:
• an external screw portion;
• and
• an operating portion that is formed in an end portion of the piston rod outside the cylinder and that is used to rotate the piston rod and change a position of the piston,
• the cylinder cover has an internal screw portion into which the external screw portion is screwed, and
• with the rotation of the piston rod via the operating portion, the blocking member blocks the cylinder hydraulic fluid chamber from the first hydraulic fluid passage portion and the piston is moved so that the hydraulic pressure in the cylinder hydraulic fluid chamber is increased for releasing the braking force of the brake unit.