Locomotive for orbital traffic, vehicle parking unit braker

The utility model relates to a locomotive for orbital traffic, vehicle parking unit brake, which relates to a braking system parking unit braking device of various locomotive vehicles for railway locomotives, vehicles, motor train units, traffic trains, tilting trains, city light rail vehicles, subway vehicles, etc. The structure of the utility model comprises an intermediate body, a cylinder body, a piston assembly, a screw rod assembly, a manual operation relief assembly, a ratchet wheel and an internal spline sleeve group, wherein the piston assembly is assembled in the cylinder body, the screw rod assembly is installed in the external spline sleeve of a piston, and the manual operation relief assembly is installed on the inner side of the intermediate body. The utility model is characterized in that an opening point at the back part of the cylinder body is provided with a guide sleeve and a protection plate which are fixed by adopting a clamp spring. The flange end surface of the intermediate body is provided with a connecting screw hole connected with a parking cylinder body, and the end surface of the intermediate body is also provided with a usual cylinder body connecting hole. The side surface of the intermediate body is provided with a usual air inlet and a parking air inlet.