Vehicle compressed air supply device

A vehicle compressed air supply device which includes an air compressor mounted on a vehicle and supplies compressed air discharged from the air compressor to each of a plurality of loads of the vehicle, comprising:

• a junction chamber which is provided at a discharge line of the air compressor and distributes the compressed air to each of the loads;
• a service brake pressure protection valve which is disposed between the junction chamber and a service brake circuit provided as the loads;
• a parking brake pressure protection valve which is disposed between the junction chamber and a parking brake circuit provided as the load;
• and
• a valve unit which is disposed in a flow path connecting the parking brake pressure protection valve and the junction chamber, and is closed until pressure of the compressed air supplied to the service brake circuit reaches a predetermined pressure value,
• wherein the valve unit is formed of a pressure protection valve having the same structure as each of the pressure protection valves,
• wherein the valve unit, the service brake pressure protection valve and the parking brake pressure protection valve have a structure including a main body with a partition wall which divides an inner space and an outer space inside the main body where the outer space surrounds the inner space, a valve seat which is provided at the partition wall;
• and a valve body which abuts the valve seat with an elastic force respectively,
• the service brake pressure protection valve is configured such that air is introduced from the compressor via said junction chamber to an outer space of the parking brake pressure protection valve and the air is discharged from an inner space of the parking brake pressure protection valve and the parking brake pressure protection valve is configured such that the air is introduced from the compressor via said junction chamber to an outer space of the service brake pressure protection valve and the air is discharged from an inner space of the service brake pressure protection valve, and
• the valve unit is configured such that the air is introduced from the compressor via said junction chamber to an inner space of the valve unit and the air is discharged from an outer space of the valve unit.