JPS6323427B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a device that is attached to a bearing of a device that requires particularly high cleanliness, such as a precision printing device that uses light, to prevent contamination of the device due to scattering and leakage of lubricating oil. This relates to a structure for preventing this.

(b) Background of the technology Recently, the number of devices and devices that apply light has increased rapidly, and the field of application of light has expanded not only to the above-mentioned precision printing equipment but also to electronic devices and communication devices. Bearings generally have many high-speed rotating parts, and countermeasures against contamination by lubricating oil generated from bearings are a particularly important issue. For this reason, there is a strong demand for the development of a labyrinth structure that prevents vaporized lubricant gas generated in the bearings of ultra-high-speed rotating shafts, where oil meal members cannot be used, from scattering and leaking from the bearings to the outside without contacting the shaft.

(c) Prior art and problems Figure 1 is a diagram for explaining the conventional lubricating gas labyrinth structure, where a is the axial labyrinth, and b is the axial labyrinth structure.
shows the cross-sectional shape of the labyrinth in the direction perpendicular to the axis.

In the figure, 1 is a bearing box, 2 is a bearing, 3 is a rotating shaft, 4 is a plurality of annular projections provided on the bearing box, 5 is a plurality of discs provided on the rotating shaft, and 5' is a plurality of discs provided on the rotating shaft. , 6 represents a maze-like gap, and 7 represents lubricating gas.

As shown in FIG. 1, the lubricating gas 7, which is the vaporized lubricating oil generated in the bearing 2 by the rotating shaft 3 that rotates at an extremely high speed, is transferred to a plurality of annular protrusions 4 provided in the bearing box 1.
A maze-like gap 6 having an A=B=D<C shape, which is formed by a plurality of discs 5 provided on the rotation shaft 3 or a plurality of annular protrusions 5' provided on the rotation shaft 3, is indicated by an arrow G. It moves forward, but in the process its power is gradually diminished by the well-known labyrinth effect. However, with this structure, it is impossible to prevent the lubricating gas 7 from scattering and leaking from the bearing box 1.

(d) Purpose of the Invention In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a lubricating gas labyrinth structure that has a simple structure and can accurately prevent lubricating gas from scattering and leaking from a bearing box. be.

(e) Structure of the Invention According to the present invention, a disc is attached to the rotating shaft so as to face the end face of a bearing box that covers the bearing, and the opposing end face of the bearing box and the disc surface are connected to each other. A guide wall is provided on at least one side of the bearing box to guide gas from the outer circumference of the end face of the bearing box to the inner circumference, and a circulation space for lubricating gas generated from the bearing is provided in a gap between the end face of the bearing box and the disc. This is achieved by providing a lubricating gas labyrinth structure characterized by the formation of a lubricating gas labyrinth structure.

(f) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram showing a lubricating gas labyrinth structure according to the present invention, in which a is a sectional view and b is a view taken along the line A-A'. In this figure, the same parts as in the previous figure are given the same reference numerals, and 10 is a disk attached to the rotating shaft, 10' is the disk surface facing the end surface of the bearing box, and 11 is the end surface of the bearing box. 12 is a circulation space constituted by the opposing end face of the bearing box and the disc face, and 13 is the end face of the bearing box.

As shown in the figure, the lubricating gas 7 generated in the bearing 2 is applied to the circular disk 10 provided on the disk surface 10' facing the end surface 13 of the bearing box 1 of the disk 10 attached to the rotating shaft 3 that rotates at an extremely high speed. Gas from the bearing box 1 to the outside is guided by a plurality of guide walls 11 inclined at an elevation angle with respect to the direction of rotation of the plate 10, and is caused by the pressure of the gas at the outer periphery of the bearing box 1 that attempts to enter from the direction of arrow C. The lubrication effect of the bearing 2 is also improved because the bearing 2 is circulated in a circulation space 12 that is prevented from scattering and leaks and is made up of the bearing box 1 and the disk 10 attached to the rotating shaft.

FIG. 3 is a diagram for explaining a modification of the guide wall provided on the disk surface, in which a is a sectional view and b is a sectional view.
B′ arrow view, c shows the X-X′ arrow cross-sectional view, respectively. In this figure, the same parts as in FIGS. 1 and 2 are given the same reference numerals, and reference numeral 15 indicates a guide wall having a curved serrated cross section. In the explanation of this figure, parts that overlap with the previous figure will be omitted to avoid complexity.

As shown in FIG. 3, the rotation direction of the disk 10 is sharp, starting from the outer peripheral side of the disk 10 provided on the disk surface 10' facing the end surface 13 of the bearing box 1, and the rotation direction of the disk 10 is sharp.
The guide wall 15 is curved with respect to the center of 0 and has a sawtooth cross section with the vertical side facing the direction of rotation of the disk 10. As a result, the gas at the outer periphery of the bearing box 1 is efficiently introduced in the direction of the arrow E, and the sawtooth cross section causes the gas at the outer periphery of the bearing box to swirl in the direction of the arrow F, making the labyrinth effect even more pronounced. The labyrinth structure described above may be attached not only to the disc 10 attached to the rotating shaft 3 but also to the end face 13 of the bearing box 1, and the labyrinth structure described above may be attached to the end face 13 of the bearing box 1.
It may be provided on both sides. Furthermore, the bearing box may be provided with an eave-like protrusion that covers the outer circumferential surface of the disc surface.

(g) Effects of the Invention As explained in detail above, the lubricating gas labyrinth structure of the present invention, despite its simple structure, can accurately prevent lubricating gas from scattering and leaking from the bearing housing. The effect is great.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a conventional lubricating gas labyrinth structure, FIG. 2 is a diagram for explaining a lubricating gas labyrinth structure according to the present invention, and FIG. 3 is a diagram for explaining a modified example of the present invention. It is. In the drawings, 1 is a bearing box, 2 is a bearing, 3 is a rotating shaft, 4 is a plurality of annular protrusions provided on the bearing box, 5 is a plurality of annular protrusions provided on the rotating shaft, 6 is a maze-shaped gap, and 7 is a maze-shaped gap. Lubricating gas, 10 is a disk attached to the rotating shaft, 10' is a disk surface facing the end surface of the bearing box,
Reference numeral 11 indicates a guide wall provided on a disk surface facing the end surface of the bearing box, 12 indicates a circulation space constituted by the opposing end surface of the bearing box and the disk surface, 13 indicates an end surface of the bearing box, and 15
respectively indicate guide walls with a curved serrated cross-section.

Claims (1)

[Claims] 1. A disk is attached to a rotating shaft so as to face an end surface of a bearing box that covers a bearing, and an outer periphery gas of the end surface of the bearing box is applied to at least one of the opposing end surface of the bearing box and the disk surface. A lubricating gas labyrinth structure, characterized in that a guiding wall is provided to guide the bearing, and a circulation space for lubricating gas generated from the bearing is formed in a gap between the end face of the bearing box and the disc.