Static pressure main shaft without independent static pressure bearing part

The invention relates to the technical field of hydrostatic spindles, in particular to a hydrostatic spindle without an independent hydrostatic bearing part, which comprises a hydrostatic shaft seat, a cutting load end component and a driving end component, a hydrostatic cavity is formed in the hydrostatic shaft seat, a hydrostatic bearing is mounted in the hydrostatic cavity, a plurality of arc-shaped grooves are formed in the inner wall surface of the hydrostatic bearing, and the cutting load end component is mounted in the arc-shaped grooves. According to the scheme, the oil wedge playing a static pressure function and the fluid channel are integrally machined in the gray iron casting, the system structure is simplified, the oil film bearing area is increased by utilizing the principle that the rigidity of a static pressure bearing oil film is in direct proportion to the oil film area; compared with a non-integrated static pressure main shaft, the oil film supporting rigidity and the main shaft system prec