JPS585525A - Static pressure fluid slide apparatus - Google Patents

Abstract

PURPOSE:To prevent leakage of operating oil by providing a second oil duct for reclaiming fluid on the outside of a pocket and coupling means for sucking fluid in the second oil duct. CONSTITUTION:Oil pressure discharged from a pump 16 passes through a switching valve 18, a first oil duct 5 and a throttle 6 into a pocket 4. The operating oil flowed out from the pocket 4 through a gap 10 into a second oil duct 7 is compulsorily sucked by a pump 20 driven by a motor 19 to be returned to a tank 14. Thus, the operating oil is prevented from leaking out from the second oil duct 7 further.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slide device using a hydrostatic fluid bearing, and in particular provides a hydrostatic fluid slide device that does not leak hydraulic oil and has a compact overall device. be.

Conventional slide mechanisms using hydrostatic fluid bearings have the following advantages and have been used in many devices in recent years.

1. The frictional resistance of the sliding part is small.

11. No wear on the sliding part (long lifespan).

Ill Bearing rigidity is greater than balls or rollers.

1v Due to the averaging effect of the fluid, straightness with higher accuracy than the processing accuracy of the guide can be obtained.

While hydrostatic fluid bearings have advantages as described above, they also have the disadvantage that when used in slide mechanisms, hydraulic oil leaks and it is difficult to handle when used in equipment. For this reason, it has been difficult to use hydrostatic fluid bearings for relatively small items.

A conventional example will be explained below using FIGS. 1 to 5. 1 to 3 show a general slide mechanism, in which a slide block 2 slides along a guide 1. FIG. 4 is a circuit diagram of the hydraulic unit 3 for supplying hydraulic oil to the hydrostatic fluid bearing.

A pocket 4 is provided on the inner surface of the slide prod 2 which is slidably fitted into the guide 1, and hydraulic pressure is supplied from a first oil passage 5 through a throttle 6. Arrow P indicates the supply of hydraulic pressure, and arrow T indicates return to the tank 12. Outside pocket 4 (10
There is a second oil road 7.

The pattern of the pocket 4 and the second oil pipe 7 is shown in FIG. There is a gap 1o between the surface 8 of the guide 1 facing the pocket 4 and the land 9 around the pocket 4. Generally, this gap is about 10 to 2 degrees [/1 m].

Now, as shown in FIG. 4, when hydraulic oil pressurized by the pump 11 of the hydraulic unit 3 is supplied to the pocket 4 through the first oil pipe 6 and the throttle 6, the slide block 2 and the guide 1 are connected to each other. During this period, there is fluid lubrication. Pocket 4 to gap 1
The hydraulic oil that has flown out through O passes through the second oil pipe 7 and returns to the tank 12 of the hydraulic uni-soto 3. Although the tank 12 of the hydraulic unit 3 is at atmospheric pressure, the hydraulic pressure of the hydraulic oil in the second oil passage 7 of the slide block 2 is higher than the atmospheric pressure because there is piping loss between the tank 12 and the slide block 2. Therefore, the hydraulic fluid is contained in a slide block.The present invention eliminates the above-mentioned drawbacks, and provides a slide device that prevents leakage of hydraulic fluid in a hydrostatic fluid bearing.

FIG. 6 is a hydraulic circuit diagram of the embodiment, in which the hydraulic unit 13
is for supplying hydraulic pressure to the hydrostatic bearing.

The hydraulic oil in the tank 14 is supplied to the pump 1 driven by a motor 15.
6, it is sucked up through a filter 17 and pressurized. The hydraulic pressure discharged from the pump 16 passes through the switching valve 18, the first oil passage 6, and the throttle 6 before reaching the pocket 4. The hydraulic oil flowing out from the pocket 4 through the gap 10 into the second oil passage 7 is forcibly sucked by a pump 20 driven by a motor 19 and returned to the tank 14. For this reason, the second oil road 7
Hydraulic oil will not leak further to the outside.

As described above, in the slide device of the present invention, the hydraulic oil in the second oil path provided outside the pocket of the hydrodynamic bearing is forcibly returned to the hydraulic unit by the pump, so the hydraulic oil leaks to the outside of the slide device. Never.

Therefore, it is easy to incorporate into the device.

Furthermore, in general, when a slide device using a hydrostatic bearing is downsized, the leakage of hydraulic oil increases significantly, but with the slide device of the present invention, there is no risk of leakage, so the device can be designed compactly.

[Brief explanation of drawings]

Figure 1 is a front view of the slide mechanism, Figure 2 is A of Figure 1,
3 is a sectional view taken along the line BB' of FIG. 1, which is a sectional view taken along line A' and shows a slide mechanism using a hydrostatic fluid bearing structure; FIG. 3 is a sectional view taken along line BB' in FIG. Fig. 4 is a hydraulic circuit diagram of a slide device using a conventional hydrostatic fluid bearing structure, Fig. 5 is a pattern diagram of a pocket and a second oil passage in a slide mechanism using a conventional hydrostatic fluid bearing structure, and Fig. 6 is a hydraulic circuit diagram of a slide device using a conventional hydrostatic fluid bearing structure. The figure is a hydraulic circuit diagram of a hydrostatic fluid slide device according to an embodiment of the present invention. 1...Guide, 2...Slide block, 4...Pocket, 6...Aperture, 5
...No. 1 oil road, completion...No. 2 oil road, 11
,16.20...Pump. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5

Claims (1)

[Claims] In a hydrostatic fluid slide device comprising a guide and a slide block that slides along the guide by flowing pressure fluid between the guide, the slide block is provided on a surface facing the guide. a first oil pipe provided to guide pressure fluid through a restricting means into the pocket; and a second oil pipe provided outside the pocket to collect the fluid flowing out from the pocket; A hydrostatic fluid slide device comprising means for suctioning the fluid that has flowed into the second oilway.