JPH059157U - Bearing device for vertical axis rotating electric machine - Google Patents

Abstract

(57) [Summary] [Purpose] Preventing the occurrence of boundary lubrication of the sliding portion between the guide bearing 1 and the thrust collar 9 even after starting for a long period of time. [Structure] A groove portion 1a is provided at an outlet of an oil supply hole 4 on an inner circumference of a guide bearing 1, and a sponge-like oil supply ring 2 is attached to the groove portion 1a.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a bearing device for a vertical rotating electric machine.

[0002]

[Prior Art]

 FIG. 5 shows a vertical sectional view of a conventional bearing device for a vertical shaft type rotating electric machine. In FIG. 5, a main shaft 8 in which a thrust collar 9 has been burned in advance is inserted into the center of the bearing housing 5 from above, and the main shaft 8 has a flange portion 9 a formed at the lower end of the thrust collar 9. Is supported by the bearing housing 5 via a thrust bearing 6 on which the lower end of the bearing is mounted.

An annular support member 7 is provided inside the bearing box 5, and an oil reservoir 3 having an annular shape in a plan view (not shown) and a U-shaped cross section is provided on the inner peripheral side of the support member 7. The formed guide bearing 1 is inserted from above, and a slight gap is formed between the guide bearing 1 and the outer peripheral surface of the thrust collar 9, and the lubricating oil penetrates as described later.

A counterbore portion 9b is formed on the inner periphery of the thrust collar 9 from the middle portion to the lower end, and an oil cylinder 15 is previously inserted into the counterbore portion 9b. A plurality of oil holes 14A penetrating obliquely upward from the inner circumference to the outer circumference are provided in the intermediate portion of the counterbore 9b of the thrust color 9, and the bottom surface of the oil sump 3 of the guide bearing 1 has the inner diameter of the guide bearing 1 A plurality of oil supply holes 4 having an inverted L-shaped cross section are provided so as to penetrate the circumference.

Above the guide bearing 1, the outer circumference of an annular reflecting plate 12 in a plan view (not shown in a vertical cross section) is supported by the bearing box 5, and is supported by the thrust collar 9 on the axial center side of the reflecting plate 12. Has a plurality of through holes 14B penetrating from the inner circumference to the outer circumference, and an oil drainer 5a is attached to the inner circumference of the upper end of the bearing box 5.

A cooling pipe 16 is arranged inside the bearing box 5, and the lubricating oil 10 is injected to the oil surface 10 a from the bottom of the guide bearing 1 to a height of about one third. A shallow groove 1b is formed on the inner circumference of the guide bearing 1 at the outlet of the oil hole 14A.

In the bearing device of the vertical shaft type rotating electrical machine configured as described above, the centrifugal force of the lubricating oil inside the oil hole 14A of the thrust collar 9 rotating with the main shaft 8 causes the pumping action from the oil hole 14A to the thrust collar. Lubricating oil is ejected from the sliding surface between the outer periphery of 9 and the inner periphery of the guide bearing 1 to the upper part of the oil sump 3 as indicated by arrow B, and the ejected lubricating oil collides with the lower surface of the reflection plate 12. Then, a part of it flows down to the oil sump 3.

On the other hand, when the vertical shaft type rotating electric machine is stopped and restarted, until then, the lubrication of the sliding surface between the guide bearing 1 and the thrust collar 9 due to the pumping action of the thrust collar 9 is stopped. Therefore, it is considered that the lubricating oil supplied from the oil sump 3 through the oil supply hole 4 holds the oil film to enable a smooth start.

[0009]

[Problems to be solved by the device]

 However, in the bearing device of the vertical shaft type rotary electric machine configured as described above, when the stoppage period of the rotary electric machine becomes long, the lubricating oil in the oil sump 3 is fed from the oil supply hole 4 to the sliding surface between the guide bearing 1 and the thrust collar 9. There is a risk that not only will boundary lubrication occur at the time of start-up and hinder smooth start-up, but the guide bearing 1 will be damaged and the rotating electric machine will vibrate abnormally.

Therefore, it is possible to reduce the clearance between the sliding surfaces of the guide bearing 1 and the thrust collar 9 as much as possible. For that purpose, the circularity of the inner circumference of the guide bearing 1 and the outer circumference of the thrust collar 9 and Since the cylindricity must be increased, it not only takes time to process and measure the guide bearing 1 and the thrust color 9, but also if the gap between the two becomes less than the specified gap due to the difference in thermal expansion, the oil film collapses. There is a fear.

Therefore, an object of the present invention is to provide a vertical shaft having a simple structure and capable of preventing the boundary lubrication of the sliding portion between the guide bearing 1 and the thrust collar 9 even if the shaft is started after being stopped for a long time. To obtain a bearing device for a rotary electric machine.

[0012]

[Means and Actions for Solving the Problems]

 The present invention provides a bearing for a vertical shaft type rotating electric machine in which an oil sump is provided on the upper surface of a guide bearing, and an oil supply hole is provided from the bottom of the oil sump to the outer peripheral surface of a thrust collar that rotates on the inner circumference of the guide bearing. In the device, a groove is provided at the outlet of the oil supply hole of the guide bearing, and a sponge-like oil supply ring is inserted into this groove to lubricate the thrust collar and the guide bearing of the vertical rotary electric machine that are stopped and started. This is a bearing device for a vertical shaft type rotary electric machine that has a simple structure and prevents the occurrence of boundary lubrication between the guide bearing and the thrust collar when starting after a long period of stoppage.

[0013]

【Example】

 An embodiment of a bearing device for a vertical shaft type rotary electric machine according to the present invention will be described below with reference to the drawings. However, the same parts as those in FIG. FIG. 1 is a vertical cross-sectional view of a vertical axis rotating electric machine according to the present invention, which corresponds to FIG. 5, FIG. 2 is an enlarged detailed view showing an essential part of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG. Is.

1, FIG. 2 and FIG. 3, a plurality of (12 in FIG. 3) refueling having an L-shaped cross section provided between the bottom of the oil sump 3 of the guide bearing 1 and the inner circumference of the guide bearing 1. A groove portion 1a is provided on the outlet side of the hole 4, and an annular oil supply ring 2 formed of a sponge material shown in the perspective view of FIG. 4 is inserted and attached to the bottom portion of the groove portion 1a. As shown in FIG. 4, a plurality of protrusions 13 are provided on the lower surface of the oil supply ring 2.

In the bearing device of the vertical shaft type rotating electric machine configured as described above, the lubricating oil stored in the oil sump 3 permeates the oil supply ring 2 and permeates into the inside of the oil supplying ring 2 when the vertical shaft type rotary electric machine stops. Then, the sliding surface between the inner circumference of the guide bearing 1 and the outer circumference of the thrust collar 9 is lubricated. The lubricating oil that has passed through the oil supply ring 2 is dropped from the protrusion formed on the lower surface of the oil supply ring 2 shown in FIG.

Therefore, in the bearing device for the vertical shaft type rotating electric machine configured as described above, the lubricating oil stored in the oil sump 3 is not supplied to the oil supply ring 2 even when the bearing device is started after a long stop period. Since the lubricating oil that is dripped after being limited to a predetermined amount is lubricated for a long period of time, it is possible to prevent the occurrence of boundary lubrication on the sliding surface when the vertical axis electric machine is restarted. Therefore, it is not necessary to improve the machining accuracy of the inner circumference of the guide bearing 1 and the outer circumference of the thrust collar 9, and it suffices to provide the groove portion 1a on the inner circumference of the thrust collar 9 and insert the oil supply ring 2 therein. With a simple structure, it is possible to prevent the occurrence of boundary lubrication in the sliding portion between the guide bearing 1 and the thrust collar 9 at the time of start-up after a long stop, and to prevent damage to the guide bearing 1 and the main shaft 8. A bearing device for a vertical axis rotating electric machine can be obtained.

[0017]

[Effect of the device]

 As described above, according to the present invention, an oil sump is provided on the upper surface of the guide bearing, and a vertical shaft type rotation machine is provided in which an oil supply hole is provided from the bottom of the oil sump to the outer peripheral surface of the thrust collar rotating on the inner circumference of the guide bearing. In a bearing device for an electric machine, a groove is provided at the outlet of the oil supply hole of the guide bearing, and a sponge-like oil supply ring is inserted into the groove to insert the thrust collar and the guide bearing of the vertical axis rotating electric machine that are stopped and activated. Since it is lubricated, it is possible to obtain a bearing device for a vertical shaft type rotating electric machine having a simple structure and capable of preventing the occurrence of boundary lubrication between the guide bearing and the thrust collar at the time of startup after a long stop.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing an embodiment of a bearing device for a vertical axis rotating electric machine according to the present invention.

FIG. 2 is an enlarged detailed vertical cross-sectional view showing a main part of a bearing device for a vertical axis rotating electric machine according to the present invention.

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

FIG. 4 is a perspective view showing a main part of a vertical axis rotating electric machine of the present invention.

FIG. 5 is a partial vertical cross-sectional view showing an example of a conventional vertical axis rotating electric machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Guide bearing, 1a ... Groove part, 2 ... Oil supply ring, 3 ... Oil reservoir, 4 ... Oil supply hole, 5 ... Bearing housing, 6 ... Thrust bearing, 7 ... Support member, 8 ... Main shaft, 9 ... Thrust collar, 1
0, 14A, 14B ... Oil surface, 11 ... Oil hole, 13 ... Projection.

Claims (1)

[Claims for utility model registration] [Claim 1] An oil sump is provided on the upper surface of the guide bearing,
In a bearing device for a vertical shaft type rotary electric machine in which an oil supply hole for supplying oil is provided on the outer peripheral surface of the thrust collar rotating from the bottom of the oil sump to the inner circumference of the guide bearing, a groove is provided at the outlet of the oil supply hole of the guide bearing. A bearing device for a vertical axis rotating electric machine, wherein a sponge-like oil supply ring is inserted into the groove.