JPS58131427A - Journal bearing - Google Patents

Abstract

PURPOSE:To provide a journal bearing which can show an enough load supporting ability, even if load is applied along the axial groove by peripherally disposing a plurality of axial grooves extended from the central part of a bearing surface to one end of the bearing and to the other end thereof. CONSTITUTION:In a journal bearing, a plurality of axial grooves 2 mounted on the inner peripheral bearing surface 1 of the bearing 1 are cut at the central part of the bearing surface 1a, and the same number of axial grooves 2 are respectively disposed on the upper and lower half surface of the bearing surface 1a in such a manner as to be in disaccord with each other. Discharge holes 3 for a lubricant are disposed in such a manner as to connect the central part of each axial groove 2 to the end surface of the bearing. Thus, even if load is applied along the axial grooves 2, a satisfactory wedge film is formed on a portion on the bearing surface 1a outside of the groove 2, so that a load supporting ability is maintained on a high level so as to prevent burning and abrasion of the bearing. Dust and the like can be smoothly discharged by the discharge holes 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to hydrodynamic journal bearings for use in water pumps, submersible motors, submersible rotating machines, and turbomachinery.

Conventionally, submersible bearings used in pumps, etc., require lubrication,
From the viewpoint of cooling and dust removal, a large number of axially grooved bearings as shown in FIGS. 1 and 2 are often used. That is, a plurality of axial grooves 2 are arranged in the circumferential direction on the bearing surface 1a on the inner circumference of the bearing 1. Although the rotating shaft is not shown, the rotating shaft is inserted into the inner peripheral surface of this bearing. Now, such a hydrodynamic bearing has a narrow space between the bearing surface 1m of the bearing 1 and the outer diameter surface of the rotating shaft! The rotating shaft is supported by the wedge effect of the lubricant existing inside the groove, but when a load is applied to the axial groove, the wedge film created by the lubricant is interrupted, reducing the load supporting capacity. It was easy to cause wear and tear on the bearings. In particular, it was most dangerous when the excitation force due to an earthquake or the like coincided with this axial groove.

An object of the present invention is to provide a hydrodynamic journal bearing that can exhibit sufficient load-bearing capacity even when a load is applied in the axial groove direction without impairing lubrication, cooling, and dust removal. With the goal.

A feature of the present invention is that the axial groove is cut at the center of the bearing surface, so that anisotropy in the load supporting capacity is less likely to occur.

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

An embodiment of the bearing of the present invention will be described with reference to FIGS. 3 to 5. As can be seen from these figures, each axial groove 2 is
The bearing surface 1a of the bearing 1 is cut at the center, and the same number of axial grooves 2 are arranged in different directions on the upper and lower half surfaces of the bearing surface 1a, as shown in FIG. ing. Furthermore, so as to connect the center part of each axial groove 2 and @receiving end surface,
A drain hole 3 for a moisturizing agent is provided in the bearing 1.

With this configuration, even if a load is applied in the direction of the axial groove 2, a sufficient wedge film is formed in the portion of the bearing surface 1a where there is no groove 2, so that the load bearing capacity is maintained as in the conventional case. There is no reduction in the temperature and the bearing burns out.

It can prevent wear and improve reliability and durability. In addition, since the discharge hole 3 is provided, the cooling effect of the bearing surface 1a and the discharge of dust are not obstructed.

FIG. 6 shows another embodiment of the present invention. This embodiment differs from the embodiment shown in FIG. Improved and uniform cooling can be achieved.

FIG. 7 shows still another embodiment of the present invention, in which a circumferential groove 4 is provided in the axial center of the bearing surface 1a.

With this configuration, although the load supporting capacity is inferior to that shown in FIG. 5, it is easy to manufacture.

In the above embodiments, the cross-sectional shape is a perfect circle, but the present invention is also applicable to non-perfect circular bearings such as four-arc bearings.

As described above, according to the present invention, the load supporting capacity in the axial groove direction can be significantly improved compared to the conventional one without impairing lubrication, cooling, and dust discharge, so that wear and damage to the bearing can be prevented and This has the effect of improving the reliability and durability of the bearing.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional bearing, FIG. 2 is a vertical sectional side view of FIG. 1, and FIG. 3 is a plan view of an embodiment of the bearing of the present invention.
4 is a vertical side view of FIG. 3, FIG. 5 is a developed view of the bearing surface of the bearing shown in FIG. 3, and FIG. 6 is a developed view of the bearing surface showing another embodiment of the bearing of the present invention. FIG. 7 is a developed view of a bearing surface showing still another embodiment of the bearing of the present invention. 1... Bearing, 1a... Bearing surface, 2... Axial groove,
3...Discharge hole, 4...Circumferential groove. Agent Patent Attorney Toshiyuki Usuda 1st Part 2nd Figure 3rd Part 2nd Shoulder 4th Part

Claims (1)

[Claims] 1. A journal bearing that exhibits hydrodynamic action, characterized in that a plurality of axial grooves extending from the center of the bearing surface to one end and the other end of the bearing are arranged in the circumferential direction. journal bearing. z The journal bearing according to claim 1, wherein the axial groove is provided with a lubricant discharge hole. λ The journal bearing according to claim 1, characterized in that a circumferential groove communicating with the axial groove end is provided at the center of the bearing surface.