Primary suspension structure for railway vehicle

The invention discloses a primary suspension structure for a railway vehicle. The primary suspension structure comprises a steel spring module, the steel spring module comprises a first spring and a second spring; the lower spacer ring structure comprises a lower cover plate and a spacer ring fixed on the lower cover plate; an anti-vibration pad module is arranged below the lower spacer ring structure; the anti-vibration pad module comprises a metal core shaft which is used for fixing a first spring and a second spring in the steel spring module; the anti-vibration pad is made of a rubber material; the metal core shaft comprises a base arranged below the distance ring and a metal core shaft integrally connected with the base; threads are arranged in the metal mandrel, the base is made of a steel plate, and the base and the anti-vibration pad are vulcanized. The hollow backstop is arranged in the middle of the upper cover plate; a round hole is formed in the middle of the upper cover plate and is communicated