JP2580912Y2 - Sliding bearing structure of rotating electric machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sliding bearing structure of a rotating electric machine cooled by lubricating oil supplied from the outside at a predetermined pressure, and the lubricating oil is divided in the sliding bearing of the rotating electric machine. Is supplied to the other load side, the supplied lubricating oil is recovered to the sliding bearing side at atmospheric pressure, and the other is supplied to the sliding bearing side to become atmospheric pressure, and the lubricating oil discharged from the load side is discharged. The present invention also relates to a sliding bearing structure of a rotating electric machine having a structure in which oil is drained together.

[0002]

2. Description of the Related Art Generally, lubricating oil supplied from the outside is divided in a sliding bearing, one of which is supplied to the other load side,
The supplied lubricating oil is recovered to the sliding bearing side at atmospheric pressure, and the other is supplied to the sliding bearing side to become atmospheric pressure, and the sliding oil of the rotating electric machine is discharged together with the lubricating oil discharged from the load side. Bearings have a special structure, one of which is equipped with an engine and the other with a generator, and as a load side connecting these two, those connected with a Geislinger joint are well known. . A conventional sliding bearing will be described as an example with reference to FIGS. 2 and 3 are longitudinal sectional views showing an example of a conventional sliding bearing structure of a rotating electric machine in which a lubricating oil supplied from the outside is separated by a sliding bearing of the rotating electric machine and supplied to the other. The flow is viewed from the sliding bearing side of the rotating electric machine that supplies the lubricating oil to the load side. FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 2 and 3, reference numeral 1 denotes a bearing housing, and a sliding bearing 2 is installed inside the bearing housing 1. Reference numeral 3 denotes a shaft, and the inner diameter of the sliding bearing 2 and the shaft 3
Is provided with a suitable gap that can be cooled by the lubricating oil 4. Reference numeral 5 denotes a lubrication hole supplied to the load side. The lubricating oil 4 supplied from the lubrication inlet shown in FIG.
And is divided into two systems in the sliding bearing. One is supplied to the other load side through an oil supply hole 5, and the supplied lubricating oil is recovered to the sliding bearing side at atmospheric pressure,
The other is supplied to the sliding bearing side and becomes atmospheric pressure, and is discharged from the discharge outlet shown in FIG. 3. As shown in FIG. 2, the lubricating oil discharged from the load side passes through the oil drain hole 6 to the sliding bearing side. It returns and is discharged from the discharge outlet together with the drainage oil in the sliding bearing. FIG. 4 shows the flow of the lubricating oil 4. The lubricating oil 4 is initially supplied by the same system, and is divided into two systems by a sliding bearing 2 of the rotating electric machine. Returning to the side, the other passes through the sliding bearing 2, and finally the two are combined and discharged.

[0003]

However, in such a structure, when the lubricating oil stops, the sliding bearing of the rotating electric machine has a disadvantage that it loses its cooling function and burns. The present invention has been made in view of the above points, and an object of the present invention is to provide a sliding bearing structure of a rotating electric machine that prevents burning of a sliding bearing.

[0004] In other words, a means for achieving the object is to suspend a pair of oil rings (7) on a shaft (3) on the inner diameter side of the sliding bearing (2), and to provide a pair of the oil rings (7). A lubricating oil reservoir is provided in the bearing housing (1) so that the lower part of the lubricating oil (4) is immersed in the lubricating oil (4). It has a bearing structure, and its lubricating oil (4) is divided in a sliding bearing (2) of a rotating electric machine, one of which is supplied to the other load side, and the supplied lubricating oil (4) is said sliding bearing (2). The sliding bearing structure of the rotating electric machine has a structure in which the atmospheric pressure is collected on the side and the other is supplied to the sliding bearing side to become the atmospheric pressure and is discharged together with the lubricating oil (4) discharged from the load side. The lubricating oil (4) supplied to the load side As for the hydraulic pressure, the lubricating oil (4) supplied to the other sliding bearing side becomes atmospheric pressure, and the supply hydraulic pressure is reduced, and the cooling effect of the load side and the sliding bearing is reduced. A pressure holding of a predetermined width in the axial direction for holding the load side lubricating oil supply oil pressure between the shaft (3) and the shaft (3) opposed to the shaft center side of the sliding bearing (2) provided between the oil rings (7). Gaps (11) are provided on both sides of the lubricating oil (4) supply section (5) to obtain a forced lubrication gap (9) in the lubricating oil (4) supply section (5).
The pressure holding gap (1) is provided between the self-lubrication gap (10) and the forced lubrication gap (9), which are provided on both outer sides in the axial direction of the pressure holding gap (11).
The inner diameter of the bearing (2) of 1) is configured to be slightly smaller than the other clearances.

[0005]

Next, the operation will be described. When a self-lubricating oil ring is provided in the conventional structure, the lubricating oil supplied from the outside at a predetermined pressure is released by the oil ring groove provided in the sliding bearing, and is separated inside the sliding bearing and supplied to the other. Cannot secure the pressure of the lubricating oil. Therefore, the structure in which the lubricating oil acts in the sliding bearing is divided into two types: forced lubrication and self-lubrication. For the joint between the forced lubrication and the self-lubrication, a clearance between the shaft and the sliding bearing is selected so that the transfer of the lubricating oil pressure is minimized. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0006]

FIG. 1 is a longitudinal sectional view of an embodiment to which a sliding bearing structure of a rotating electric machine according to the present invention is applied, and FIG.
Those having the same sign as have the same function. In FIG. 1, a groove 8 for receiving an oil ring 7 is provided on the inner diameter side of the sliding bearing 2. The bearing housing 1 is provided with lubricating oil so that the lower part of the oil ring 7 is immersed in the lubricating oil 4. The inner diameter of the sliding bearing 2 in contact with the shaft 3 is divided into a gap 9 for forced lubrication and a gap 10 for self-lubrication, and a joint part between the gap 9 for forced lubrication and the gap 10 for self-lubrication is provided with a gap 11 for holding pressure. It is. With such a structure, forced cooling and self-lubrication can be used in combination for cooling in the sliding bearing 2, and lubricating oil can be supplied while separating pressure in the sliding bearing 2 and maintaining the other pressure.

As described above, according to the present invention, the provision of the pressure holding gap not only allows the lubricating oil to be smoothly supplied to the load side, but also causes the lubricating oil supplied from the outside to change for some reason. Even if supply becomes unavailable,
Sliding bearings prevent short-term lubricating oil stoppage due to a delay in lubricating oil supply until the system stops or when starting or stopping, such as preventing all lubricating oil from flowing to the slip shaft side due to clearance. And burnout on the load side can be prevented.

[0008]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a sliding bearing structure of a rotating electric machine according to the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional sliding bearing structure of a rotating electric machine.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a block diagram showing a flow of a lubricating oil.

[0009]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing housing 2 Sliding bearing 3 Shaft 4 Lubricating oil 5 Lubrication hole 6 Drainage hole 7 Oil ring 8 Groove 9 Clearance for forced lubrication 10 Clearance for self-lubrication 11 Pressure clearance

Claims (1)

(57) [Scope of request for utility model registration] An oil ring (7) is suspended from a shaft (3) on the inner diameter side of a sliding bearing (2), and a lower portion of the oil ring (7) is provided with the lubricating oil (4). A lubricating oil reservoir is provided in the bearing housing (1) so as to be immersed in the lubricating oil. The sliding housing structure of the rotating electric machine is cooled by a lubricating oil (4) supplied from the outside at a predetermined pressure. ) Are separated in the sliding bearing (2) of the rotating electric machine, one is supplied to the other load side, and the supplied lubricating oil (4) is recovered to the sliding bearing (2) side under atmospheric pressure, The other is provided in the sliding bearing side of the rotating electric machine, in which the lubricating oil is supplied to the sliding bearing side to be at atmospheric pressure and discharged together with the lubricating oil (4) discharged from the load side. Oil (4) is supplied to the other sliding bearing. Since the lubricating oil (4) is at atmospheric pressure, the supply oil pressure is reduced, and the cooling effect of the load side and the sliding bearing is reduced. Therefore, the sliding bearing provided between the pair of oil rings (7). In order to maintain the load-side lubricating oil supply oil pressure between the shaft (3) facing the shaft center side of (2), a pressure holding gap (11) having a predetermined width in the axial direction is applied to the lubricating oil (4). The lubricating oil (4) is provided on both sides of the lubricating oil (4) with a gap for forced lubrication (9) provided on both sides of the lubricating oil (4). The inner diameter of the bearing (2) of the pressure holding gap (11) is set to be slightly smaller than the other gaps so that the pressure does not decrease between the gap (10) and the gap (9) for forced refueling. Features a sliding bearing structure for rotating electric machines.