Hydrostatic bearing assembly

A hydrostatic bearing assembly connected to a pump for supplying fluid and disposed on a slide rail, the hydrostatic bearing assembly comprising:

• a bearing movably disposed on the slide rail and further comprising two sub-bearing portions disposed opposite to each other on two opposite sides of the slide rail, wherein an equivalent area ratio of the two sub-bearing portions is α, and 0.5≤α≤2, wherein α=Ae1/Ar2, Ae1 is an equivalent area of one of the two sub-bearing portions, and Ae2 is an equivalent area of the other of the sub-bearing portions;
• and
• two membrane throttles connected to the pump for supplying fluid, flowing through the two membrane throttles to flow between the two sub-bearing portions and the slide rail, each of the membrane throttles further comprising:
• a casing, at least one of the casing and a corresponding sub-bearing portion of the two sub-bearing portions further comprising a chamber, an inlet and an outlet for communicating with the chamber, and an outlet surface, wherein the pump is connected to the inlet, and the slide rail is disposed adjacent to the outlet, and
• a throttling membrane piece being positioned in the chamber and covering the outlet surface.