Round static pressure air bearing with concave middle part of working surface

The invention discloses a circular static pressure air bearing with a concave middle part of a working surface, and relates to an effective method for improving the comprehensive performance of the static pressure air bearing. The technical problem that the comprehensive performance of an existing static pressure air bearing cannot be improved is solved, a rotary free-form surface is adopted as a transition structure of the working face of the bearing, the circular static pressure air bearing with the inwards-concave middle of the working face is designed, the bearing capacity, static rigidity, damping and other performance of the bearing can be effectively improved, and the service life of the bearing is prolonged. Meanwhile, less turbulent flow is generated in the air film flow field, and the stability of the bearing is better. The comprehensive performance of the static pressure air bearing in China can be improved, and the advantages in the fields of ultra-precision measurement, machining and the like in