Patent TW-200812745-A (TW)
Title: Structure of main shaft with hydrostatic pressure
Inventor: Cai bao-hua
IPC: B23Q1/38
Filed: 2006-09-11
Abstract: A structure of main shaft with hydrostatic pressure is disclosed, includes a shaft seat, a main shaft, two shaft linings, two rear covers, one oil route distributing device, plural first regulating devices and plural second regulating devices; wherein a chamber is provided inside the shaft seat, each of the shaft linings is respectively provided at the two ends of the shaft seat, each of the shaft linings is pivotally connected to the main shaft, the inner wall of each of the shaft linings is concavely provided with plural oil bags for forming hydrostatic bearing films; the two rear covers are respectively and pivotally provided on the main shaft at the inner side of each of the shaft linings and connected with each of the shaft linings, each of the shaft linings is axially provided with plural oil routes communicating with the oil bags, each of the second regulating devices are respectively provided on each of the oil routes so a first regulation is obtained for balancing the pressures of the hydrostatic bearing films, one end of each of the oil routes is adjacent to the rear covers, an oil discharging hole is respectively provided on each of the shaft linings for communicating with the chamber, a ring-shaped oil tank is provided on each of the rear covers and the ring-shaped oil tanks communicate with each of the oil routes, an oil feeding hole is throughoutly and respectively provided on the rear covers and communicates with the oil tanks, the other end of each of the oil feeding holes communicate with the chamber, so oil can passes through the rear covers and the oil routes then flows into each of the oil bags, and the oil is circulated back to the chamber via the oil discharging holes; the oil route distributing device is provided on the top end of the shaft seat, and is mainly composed by a distributing block and a supporting sheet, the supporting sheet is connected to the shaft seat, the distributing block is provided on the top end of the supporting sheet, the center of the distributing block is provided with an oil cavity, an oil introducing hole communicating with the oil cavity is radially provided on the distributing block, lateral walls of the oil cavity are provided with two oil passing holes that are opposite to each other, each of the first regulating devices is respectively provided in the oil passing holes, and each of the oil passing holes communicates to the bottom end of the distributing block, the supporting sheet passes through the two oil discharging holes and communicates with each of the oil passing holes, so the oil can flows into the oil cavity via the oil introducing hole, a first regulation is formed according to the first regulating devices and the oil is dispensed then flows into the chamber, so the pressures of the hydrostatic bearing films respectively formed between the main shaft and each of the shaft linings are balanced, and the rotation processing performance of the main shaft is enhanced and the operation precision and service life of the main shaft are also increased.