Special limit block for reducing degree of freedom of upper hinge seat of coil spring and installation structure thereof

The invention provides a special limit block for reducing the degree of freedom of an upper hinge seat of a coil spring and an installation structure thereof. The special limit block and the installation structure thereof are arranged in a suspension system of a wheeled armored vehicle. The special limit block comprises a main body of the limit block, a hole is formed in the center of the main body, the main body includes a first end portion and a second end portion located on the opposite sides of the hole, extending from a first position between the first end portion and the second end portion to the second end portion, the thickness of the main body gradually increases, and therefore the main body forms a limit curved-surface. According to the special limit block and the installation structure thereof, the outer part of an anti-dropping protrusion is in clearance fit with a vehicle body attachment seat, the inner part of the anti-dropping protrusion is in clearance fit with the upper hinge seat of the coil