Wet parking brake device

A wet parking brake device comprising:

• a shaft case;
• a rotary shaft accommodated in the shaft case;
• a plurality of stators held on the shaft case and arranged side by side movably in an axial direction of the rotary shaft;
• a plurality of brake discs held on the rotary shaft and each of which is interposed between any two adjacent stators of the plurality of stators;
• a piston plate held on the shaft case and movable toward the brake discs in the axial direction of the rotary shaft;
• and
• a pressing mechanism configured to press the piston plate toward the brake discs,
• the wet parking brake device being configured such that the brake discs and the stators come in contact with each other by a pressing from the piston plate pressed by the pressing mechanism to thereby generate a braking force against the rotary shaft, wherein
• the pressing mechanism includes:
• a parking rod that is turnably supported in the shaft case and has a turning axis in a vertical direction;
• and
• an arm member that is connected to the parking rod and turns around the turning axis,
• the parking rod includes:
• a rod main body which has an insertion hole through which the rotary shaft is inserted and a pressing portion that presses the piston plate;
• an upper shaft portion that is located on an upper part of the rod main body;
• and
• a lower shaft portion that is located on a lower part of the rod main body and is coaxial with the upper shaft portion, and
• the rod main body has a shape which does not protrude from an area enclosed by an outer peripheral edge of the piston plate in a radial direction of the rotary shaft.