JP2006153109A - Slide bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent leakage of oil, with no adjustment of a gap between a rotating shaft and a groove on the partition wall of a bearing box. <P>SOLUTION: Bearing bodies 2 and 2 that rotatably support a rotating shaft 1 while a lubricant is supplied are provided outside the rotating shaft 1. Outside the bearing bodies 2 and 2, a bearing box 13 is provided which is provided with partition walls 13 and 13 having grooves, facing each other, on the periphery of the rotating shafts 1 on both sides in axial direction. Further, on the outside of the partition walls 13a and 13a of the bearing box 13, a shielding plate 4 having a function to prevent oil leakage in the gap against the periphery of the rotating shaft 1 is detachably fitted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

 The present invention relates to a sliding bearing device provided in a rotary machine such as a synchronous generator, and more particularly to a sliding bearing device having an improved oil leakage prevention structure.

 In a rotating machine such as a synchronous motor, for example, a sliding bearing device is provided to rotatably support a rotating shaft. In the slide bearing device, the rotation shaft is smoothly rotated by supplying lubricating oil to the rotation shaft support surface of the bearing body to support the rotation shaft.

 Hereinafter, a conventional plain bearing device will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing a conventional plain bearing device. In FIG. 3, a bearing body 2, 2 that is divided into upper and lower parts that rotatably supports the rotating shaft 1 is provided at a predetermined position of the rotating shaft 1. A bearing box 3 is provided. The bearing bodies 2 and 2 support the rotating shaft 1 through a supply means such as a lubricant oil (not shown) filled in the lower portion of the bearing housing 3 or a lubricant supply from the outside of the bearing housing. Lubricating oil is supplied to the surface.

 Partition walls 3a and 3a are respectively provided on both side portions in the axial direction of the bearing housing 3, and a plurality of oil leakage preventers are provided on the inner peripheral edge of the partition walls 3a and 3a facing the peripheral surface of the rotary shaft 1. The grooves 3b are spaced apart in the axial direction, and the grooves 3b and the partition walls 3b communicate with each other so as to return the lubricating oil that has entered the plurality of grooves 3b to the inside of the partition walls 3a. Holes 3c and 3c are provided.

 The plain bearing device configured as described above supports the rotating shaft 1 rotatably by the bearing bodies 2 and 2, while the lubricating oil in the bearing housing 3 leaks out of the bearing housing 3 through the rotating shaft 1. Is prevented by repeating the action of returning to the inside of the bearing housing 3 through the groove 3b and the hole 3c.

 However, since such a sliding bearing device is dimensioned by combining the bearing bodies 2 and 2 and the bearing housing 3 manufactured by machining, the grooves 3b of the partition walls 3a and 3a and the rotary shaft 1 are assembled after assembly. There is a problem that the gap with the peripheral surface cannot be adjusted, and when the gap between the groove 3b and the peripheral surface of the rotary shaft 1 is large, there is a problem that the oil leakage prevention function does not function sufficiently.

 The present invention has been made to solve such problems, and is a sliding bearing that can sufficiently prevent oil leakage without requiring adjustment of the gap between the groove in the partition wall of the bearing box and the peripheral surface of the rotary shaft. An object is to provide an apparatus.

 In order to solve the above problems, the sliding bearing device of the present invention supports a rotating shaft rotatably, a bearing body to which lubricating oil is supplied to a supporting surface of the rotating shaft, and supports the bearing body from the outside, A bearing box provided with a partition wall having a groove for preventing oil leakage opposite to the circumferential surface of the rotating shaft on both sides in the axial direction, and provided on the outside of the partition wall of the bearing box, And a shielding plate having a function of preventing oil leakage with respect to the gap.

 According to the sliding bearing device according to the present invention, the outer wall of the partition wall of the bearing housing is provided with the shielding plate capable of adjusting the gap with the peripheral surface of the rotary shaft, thereby preventing the oil leakage prevention groove on the partition wall. A highly reliable oil leakage prevention structure can be obtained without requiring adjustment of the gap with the peripheral surface of the rotating shaft.

 Embodiments of the present invention will be described below. FIG. 1 is a sectional view showing a plain bearing device according to a first embodiment of the present invention. In FIG. 1, cylindrical bearing bodies 2 and 2 that rotatably support the rotating shaft 1 are provided at predetermined positions of the rotating shaft 1 in a vertically divided configuration. A cylindrical bearing box 13 is provided outside the bearing bodies 2 and 2 so as to support the bearing bodies 2 and 2 from the outside. The bearing box 13 lifts the rotating shaft 1 of the bearing bodies 2 and 2 through a supply means such as a lubricant oil (not shown) filled in the lower part of the inside of the bearing box 13 or a lubricant supply from the outside of the bearing box. Lubricating oil is supplied to the supporting surface.

 Partition walls 13a and 13a are respectively provided on both sides in the axial direction of the bearing housing 13, and protrusions 13d and 13d that protrude in the axial direction and extend annularly are provided on the outer surfaces of the partition walls 13a and 13a, respectively. ing. In addition, a plurality of oil leakage preventing grooves 13b are provided on the inner peripheral edge of the partition walls 13a, 13a facing the peripheral surface of the rotary shaft 1, and are provided at intervals in the axial direction over the entire circumference. Further, holes 13c and 13c communicating with the groove 13b and the inside of the partition wall 13a are provided below the partition walls 13a and 13a so that the lubricating oil that has entered the plurality of grooves 13b is returned to the inside of the partition wall 13a. Is provided.

 On the outer side in the axial direction of the partition walls 13a, 13a, donut board-like shielding plates 4, 4 are respectively provided. The shielding plates 4 and 4 are detachably attached to the projections 13d and 13d of the partition walls 13a and 13a by fasteners 5 such as screws and bolts, and the positions and sizes of the attachment holes of the shielding plates 4 and 4 and By appropriately adjusting the diameter and the like of the inner peripheral edge, the gap between the inner peripheral edge and the peripheral surface of the rotary shaft 1 can be adjusted appropriately.

 In addition, oil sump grooves 6 and 6 are formed between the partition walls 13a and 13a and the shielding plates 4 and 4 by the protruding height of the projections 13d and 13d, and below the partition walls 13a and 13a, A plurality of holes 13e, 13e for returning the lubricating oil from the oil reservoir grooves 6, 6 to the inside of the partition walls 13a, 13a are formed.

 In the sliding bearing device configured as described above, the shielding plates 4 and 4 can be provided after the bearing bodies 2 and 2 and the bearing box 13 are assembled. Since the partition walls 13a and 13a are detachably attached to the partition walls 13a and 13a, the partition walls 13a and 13a can be adjusted so as to have an appropriate gap with the peripheral surface of the rotary shaft 1, and the partition walls 13a and 13a can be provided with oil. Oil shielding that cannot be prevented by the leakage preventing grooves 13b and 13b can be prevented by the shielding plates 4 and 4.

 The lubricating oil collected in the oil sump grooves 6 and 6 is returned to the inside of the partition walls 13a and 13a through the holes 13e and 13e provided in the partition walls 13a and 13a. There is no overflow outside.

 Therefore, according to the present embodiment, the oil leakage of the bearing device is not required without adjusting the gap between the oil leakage preventing grooves 13b, 13b in the partition walls 13a, 13a of the bearing housing 13 and the peripheral surface of the rotary shaft 1. Can be sufficiently prevented, and its reliability can be improved.

 FIG. 2 is a sectional view showing a plain bearing device according to a second embodiment of the present invention. This embodiment is different from the first embodiment in that the shielding plates 14 and 14 are provided with oil leakage preventing grooves 14b and 14b and holes 14c and 14c. The donut disk-shaped shielding plates 14 and 14 are formed with a plurality of oil leakage prevention grooves 14b and 14b at the inner peripheral edge, and holes 14c that return the lubricating oil that has entered the grooves 14b and 14b to the oil sump groove 6. , 14c are formed.

 By providing such shielding plates 14 and 14, an oil leakage preventing effect can be obtained as in the first embodiment, and lubricating oil may enter the inner peripheral edge of the shielding plates 14 and 14. In addition, the grooves 14b and 14b at the inner peripheral edge can be returned to the oil sump groove 6 through the holes 14c and 14c, and the lubricating oil accumulated in the oil sump groove 6 can be separated through the holes 13e and 13e. , 13a, the oil leakage prevention effect by the shielding plates 14, 14 can be further enhanced.

 In addition, the groove | channel for oil leakage prevention in each said embodiment and the hole for oil return can set arbitrarily the depth dimension, a shape, a hole diameter dimension, an inclination angle, a number, etc.

It is sectional drawing which shows the slide bearing apparatus concerning 1st Embodiment in this invention. It is sectional drawing which shows the slide bearing apparatus concerning 2nd Embodiment in this invention. It is sectional drawing which shows the conventional slide bearing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 2 ... Bearing main body 3, 13 ... Bearing box 3a, 13a ... Partition wall 3b, 13b, 14b ... Groove 3c, 13c, 13e, 14c ... Hole 4, 14 ... Shield plate 5 ... Fastener 6 ... Oil sump Groove 13d ... protrusion

Claims (2)

 A bearing body that rotatably supports the rotating shaft, and that is supplied with lubricating oil on the support surface of the rotating shaft, and supports the bearing body from the outside, and faces the circumferential surface of the rotating shaft on both sides in the axial direction. A shielding box having a partition wall having a groove for preventing oil leakage and a sealing plate provided outside the partition wall of the bearing box and having an oil leakage preventing function with respect to a gap between the peripheral surface of the rotary shaft A plain bearing device consisting of   The shielding plate is provided with a groove for preventing oil leakage at a position facing the peripheral surface of the rotating shaft, and a hole is provided for communicating the groove with the inside of the shielding plate. The plain bearing device according to claim 1.

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