JP2850986B2 - Automatic alignment mechanism of spiral groove type thrust bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-aligning spiral groove type thrust bearing in which a stationary thrust plate is provided on both sides of a rotating thrust disk through a thrust collar having spiral grooves engraved on both surfaces. Regarding the mechanism.

[0002]

2. Description of the Related Art Such a spiral groove type thrust bearing has a large load capacity per unit area and is suitable for a submersible pump whose outer diameter is restricted.

[0003]

However, in this type of bearing, it is necessary to keep the flatness of the wide sliding surface of the thrust disk good and to secure the gap between the sliding surfaces to be equal to or more than the minimum oil film thickness even in a small portion. There is.

This thrust disc minimizes irregularities in machining accuracy, assembling accuracy, and irregularities caused during operation, keeps the sliding surface flat, and faces the sliding surface. To ensure the proper clearance.

On the other hand, it is conceivable to form the thrust disk on a spherical seat, but this is insufficient for the requirement of flatness on the order of microns, and in particular, a thrust thrust type in which the shaft passes through the bearing. In a bearing, the shape of the spherical seat becomes large, and it is difficult to maintain a wide seat surface with high accuracy.

According to the present invention, the flat state of a highly rigid thrust disk machined with high precision is maintained as good as possible from the assembly state to the operation state, that is, the thrust operation state, and the squareness is deviated. It is an object of the present invention to provide a self-aligning mechanism of a spiral groove type thrust bearing which can absorb the force.

[0007]

According to the present invention, a spiral groove type thrust bearing in which a stationary side thrust plate is provided on both sides of a rotating side thrust disk via a thrust collar having spiral grooves engraved on both sides thereof. Wherein the thrust disk and the thrust plate are formed in a thick annular body, and an equal pressure support seat formed of a metal bellows filled with a liquid or gel substance is interposed between the thrust plate and the main body. .

[0008] On both sides of the inner peripheral edge of the thrust disk,
It is preferable that the disk is supported by an elastic sleeve that is easily compressed and deformed, so that the surface deflection during rotation of the disk is easily absorbed.

[0009]

In the self-aligning mechanism of the spiral groove type thrust bearing configured as described above, the equal pressure support seat has a uniform internal pressure according to the thrust load, and absorbs irregularity between the thrust disk and the main body receiving surface. , Equal gap (equal oil film thickness) is maintained.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a sleeve 13 is axially locked to a pump shaft 10 by a pair of split rings 11 and an adjusting ring 12, and a sleeve 14 is locked to a rotating direction by a key 14. The thrust disk 1 is locked to the sleeve 13 by a key 15 in the rotation direction.
Elastic sleeves 2 and 2 that are easily compressed and deformed are provided on both sides of the inner edge portion. Note that reference numeral 17 in the drawing denotes an oil passage formed between the pump shaft 10 and the sleeve 13, and reference numerals 18 and 19 denote oil holes that communicate the oil passage 17 to the outside.

The disc 1 is formed in a thick annular body having high rigidity. The disc 1 is in contact with upper and lower surfaces (the left side is an upper side in the drawing), and has thrust collars 3 on both sides.
Is provided. On the upper and lower surfaces of the thrust collar 3, a plurality of spiral grooves 3a are formed by a known technique as shown in FIG.

A thrust plate 4 is provided in contact with the thrust collar 3, and the thrust plate 4 is formed in a thick rigid and high annular body, and is locked in a rotational direction by a dowel pin 9.

A constant pressure support seat 5 is interposed between the thrust plate 4 and the main body 20. The equal pressure support seat 5 is composed of seat plates 6, 6 in contact with the thrust plate 4 and the main body 20, and an annular metal bellows 7 formed by connecting the both seat plates 6, 6. Alternatively, the gel material 8 is sealed. The metal bellows 7 is, for example, several tens of k
g / cm ² .

The thrust collar 3 constructed as described above
Is in a floating state during rotation and is lightly stuck to the thrust plate 4. On the other hand, during rotation, the lubricating oil circulates as shown by the arrow, and between the surface with the thrust disk 1, as shown in FIG. A is generated, and a gap of, for example, about 10 microns is formed. When an upward thrust load acts on the pump shaft 10, for example, the upper thrust collar 3 and the thrust disc 1
Thrust collar 3 on both sides sliding surface C _1, and the lower the
Sliding surface C ₂ of the thrust disk 1 becomes free surface.

FIGS. 4 and 5 are views for explaining the operation and effect of the present invention. As shown in FIG. 4, when the thrust disk 1 oscillates, the gap of the gap is formed by the action of the spiral groove 3a of the thrust collar 3. The oil pressure on the larger side is higher and the oil pressure on the smaller side is lower. Then, as shown in FIG. 5, the constant pressure support seat 5 in the low hydraulic pressure portion expands and the constant pressure support seat 5 in the high hydraulic pressure portion contracts. As a result, the thrust collar 3 and the thrust disk 1 are substantially parallel, and a similar pressure is generated in the gap. Accordingly, as shown in FIG. 3, the equal pressure support seat 5 has a uniform internal pressure B according to the thrust load, and presses the thrust plate 4 via the seat plate 6 with the internal pressure B. Then, the irregularity between the thrust disk 1 and the main body receiving surface is absorbed, and an equal gap (equal oil film thickness) is always maintained.

[Effects of the Invention] Since the present invention is configured as described above, the rigidity of the thrust disk and the thrust plate is increased so that deformation is less likely to occur.
They can be supported by a deformable equal-pressure support seat and an elastic sleeve to absorb surface run-out and maintain a good surface state. Therefore, it is possible not only to automatically align the shaft core, but also to bring the load capacity with respect to the thrust load close to the theoretical solution where the load capacity is the largest with a fixed gap.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of the present invention.

FIG. 2 is a front view of a thrust collar.

FIG. 3 is an explanatory diagram showing hydraulic pressure generated in a thrust collar.

FIG. 4 is an explanatory diagram showing hydraulic pressure generated in a thrust collar when a thrust disk is inclined.

FIG. 5 is an explanatory view showing a state of an equal pressure support seat in the state of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thrust disk 2 ... Elastic sleeve 3 ... Thrust collar 3a ... Spiral groove 4 ... Thrust plate 5 ... Equal pressure support seat 7 ... Metal bellows 10 ... Pump shaft 11 Split ring 12 Adjustment ring 13 Sleeve 14 15 Key 16 Nut 17, 18, 19 Oil passage

Claims (1)

(57) [Claims] 1. A spiral groove type thrust bearing in which a stationary thrust plate is provided on both sides of a rotating thrust disk via thrust collars having engraved spiral grooves on both surfaces, wherein the thrust disk and the thrust plate are thick. A self-adjusting spiral groove type bearing having an annular body and an isostatic support seat formed of a metal bellows filled with a liquid or gel substance between the thrust plate and the main body. Wick mechanism.