Parking brake system

A parking brake system including:

• a parking brake lever (13) swingably pivotally supported on a vehicle body (11), and capable of being pulled up so as to drag a brake cable (14);
• a ratchet pawl (19) pivotally supported on the parking brake lever (13) via a fulcrum pin (18);
• a ratchet plate (17) fixed to the vehicle body, and including a plurality of locking teeth (17a) and a plurality of locking grooves (17b) arranged alternately, a locking claw (19c) of the ratchet pawl (19) capable of engaging with the locking teeth (17a) and the locking grooves (17b);
• and
• a release rod (23) configured to press the ratchet pawl (19) in accordance with an occupant's release operation to make the ratchet pawl (19) swing in a direction in which the locking claw (19c) is disengaged from the locking grooves (17b),
• characterized in that
• a predetermined clearance is provided between the ratchet pawl (19) and the fulcrum pin (18),
• a direction of a first straight line and a direction of a second straight line are set different from each other, the first straight line representing a straight line on which a point (b) of contact between the ratchet pawl (19) and the release rod (23), a center (O1) of an arc of one of the locking teeth (17a), and a center (O2) of an arc of the locking claw (19c) exist while a tip of the locking tooth (17a) and a tip of the locking claw (19c) are in contact with each other, the second straight line representing a straight line on which a point (a) of contact between the fulcrum pin (18) and the ratchet pawl (19), the center (O1) of the arc of the locking tooth (17a), and the center (O2) of the arc of the locking claw (19c) exist while the tip of the locking tooth (17a) and the tip of the locking claw (19c) are in contact with each other, and the ratchet pawl (19) is movable relative to the release rod (23).