JP2002147687A - Oil ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil ring capable of sufficiently supplying a lubricant and surely preventing the burning of a bearing. SOLUTION: This oil ring 10 is mounted around a shaft 75 pivoted on sliding bearings 61a, 61b, having an inner diameter larger than a diameter of the shaft 75, and being rotated in accompany with the rotation of the shaft 75. The oil ring 10 scrapes up and supplies the lubricant 53 reserved at a lower part of the shaft 75 to the shaft 75 and the sliding bearings 61a, 61b. The oil ring 10 has a tooth 13 for scraping up the lubricant. The oil ring 10 is composed of a center ring 11 provided with the ring-shaped tooth 13 (internal tooth), and side rings 21, 31 holding both sides of the center ring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil ring suitable for a bearing portion for supporting a shaft.

[0002]

2. Description of the Related Art Conventionally, an oil ring for lubricating between a shaft and a bearing is sometimes attached to a bearing portion that supports the shaft. That is, as shown in FIG. 7, for example, a portion where the shaft 80 is supported by sliding bearings 85 (85a, 85b) is covered with a casing 90, and lubricating oil 9
The oil ring 100 is rotatably housed in a recess 87 provided on the inner peripheral side of the upper slide bearing 85a. The oil ring 100 projects outward from both ends of the concave portion 87 of the upper slide bearing 85a to cover the lower slide bearing 85b. At this time, the lower part of the oil ring 100 contacts the lubricating oil 95.

When the shaft 80 rotates, the oil ring 1
00 also rotates around this, and lubricates the lubricating oil 95 to the sliding contact portion between the shaft 80 and the sliding bearing 85 to lubricate the sliding contact portion.

However, the conventional oil ring 10
In the case of 0, the amount of the lubricating oil 95 that can be scraped is not sufficient, and there is a possibility that the sliding bearing 85 may be burned out due to insufficient lubricating oil supply.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an oil ring capable of sufficiently supplying lubricating oil and reliably preventing bearing burnout. To provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to provide a structure in which a lower part of a shaft is provided around a shaft supported by a bearing by rotating around the shaft with an inner diameter larger than the diameter of the shaft. In an oil ring attached so as to scrape and supply a certain lubricating oil to a shaft and a bearing, the oil ring is provided with lubricating oil scraping teeth. Thereby, the amount of lubricating oil that can be scraped up can be made a sufficient amount.

Here, the teeth are provided in a ring shape on the inner peripheral surface and / or the outer peripheral surface of the oil ring. As a result, one of the teeth always keeps scooping up the lubricating oil.

[0008] The oil ring is characterized by comprising a center ring provided with ring-shaped teeth and side rings which sandwich both sides of the center ring. This allows the teeth of the central ring to be covered by the side rings on both sides so that the teeth do not directly touch the shaft or the bearing.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a pump P using an oil ring according to the present invention. The pump P shown in the drawing has a discharge casing 71 built in a suction casing 70, an impeller 73 housed in the discharge casing 71, and a shaft 7
5, and both sides thereof are supported by bearing mechanisms 60 and 65 via seal mechanisms 77 and 77, respectively. When the shaft 75 is driven to rotate by driving means (not shown), the impeller 73 rotates, and fluid is sucked from the suction casing 70 into the suction ports 72 provided on both sides of the discharge casing 71 to discharge the discharge port of the discharge casing 71. It is discharged from 74.

FIG. 2 is a schematic sectional view showing the internal structure of the bearing mechanism 60 in an enlarged manner. FIG. 3 is a schematic sectional view taken along line AA of FIG. 2 (however, the casing 50 is omitted). As shown in both figures, the shaft 75 is supported by a sliding bearing 61 (61a, 61b), and the sliding bearing 61 is supported by a casing 50 covering the same, and the casing 50 is supported by a suction casing 70 shown in FIG. ing. An oil sump chamber 51 is provided at a lower portion of the casing 50, and a lubricating oil 53 is stored therein.

The sliding bearing 61 has a substantially semi-cylindrical upper bearing 61.
a and a lower bearing 61b, and are integrally formed to form a single cylinder. The upper bearing 61a has an arc-shaped ring storage recess 64 on its inner peripheral surface side.
Are provided, and a small hole 67 penetrating therethrough is provided in an upper portion of the ring storage recess 64. And upper bearing 6
One sliding bearing 61 is constituted by joining and fixing the lower bearing 61b to the lower bearing 61a. At this time, the openings 69, 69 are formed by the ring receiving recess 64.

FIG. 4 is a side sectional view of the oil ring 10. As shown in FIG. As shown in the figure, the oil ring 10 is integrally fixed so that both sides of a central ring 11 are sandwiched between side rings 21 and 31.

The central ring 11 has teeth (internal teeth) 13 formed at equal intervals on the inner peripheral surface of the ring, and is formed in a shape like an internal gear. The side rings 21 and 31 are ring-shaped and have an inner diameter slightly smaller than the inner diameter of the central ring 11. Central ring 11 and side ring 2
The fixing between the members 1 and 31 is performed by various fixing means such as pins and welding. The inner diameter of the oil ring 10 is formed significantly larger than the outer diameter of the shaft 75.

The oil ring 10 is shown in FIGS.
As shown in the figure, the shaft 75 is mounted so as to surround the outer periphery of the shaft 75 while being housed in the ring housing recess 64. At this time, the oil ring 10 projects from the openings 69, 69 to surround the shaft 75 and the lower bearing 61b. At this time, the lower part of the oil ring 10 is immersed in the lubricating oil 53.

Then, the shaft 75 rotates and the oil ring 10
As the oil ring 10 rotates, the lubricating oil 53 is scraped up with the rotation of the oil ring 10 and supplied to the sliding contact portion between the shaft 75 and the sliding bearing 61. At this time, since the teeth 13 are provided on the oil ring 10, the lubricating oil 53
Therefore, a sufficient amount of the lubricating oil 53 can be supplied to the sliding contact portion between the shaft 75 and the sliding bearing 61, and the burning of the sliding bearing 61 due to insufficient lubricating oil supply can be reliably prevented.

In this embodiment, the oil ring 1
Since the inner diameter of the portion where the zero tooth 13 is provided is larger than the inner diameter of the portion on both sides thereof, the tooth 13 does not directly touch the shaft 75 and the shaft 75 is reliably prevented from being damaged by the tooth 13. it can.

FIG. 5 is a schematic sectional view showing the internal structure of the other bearing mechanism 65 in an enlarged manner. In the figure, the same parts as those of the bearing mechanism 60 are denoted by the same reference numerals, and detailed description thereof will be omitted. In this bearing mechanism 65, the bearing mechanism 6
The only difference from 0 is the structure of the shaft end. That is, the bearing mechanism 65 differs from the bearing mechanism 60 only in that a ball bearing 55 for a thrust bearing, a shaft end nut 56, and a bearing cover 57 are attached to the end of a shaft 75. 61 and the oil ring 10 have the same structure. In this bearing mechanism 65,
The lubricating oil 53 can effectively lubricate the ball bearing (thrust bearing) 55.

FIGS. 6A and 6B are side sectional views showing oil rings 10-2 and 10-3 according to other embodiments, respectively. 4, the same parts as those of the oil ring 10 shown in FIG. 4 are denoted by the same reference numerals, and the detailed description thereof will be omitted. The oil ring 10-2 shown in FIG. 6A is different from the oil ring 10 shown in FIG. 4 in that teeth (external teeth) 13 are formed at equal intervals on the outer peripheral surface instead of the inner peripheral surface of the central ring 11. 6 (b), and is formed only in a shape like an external gear.
3 differs from the oil ring 10 shown in FIG. 4 only in that teeth (internal teeth and external teeth) 13 are formed at equal intervals on both the inner peripheral surface and the outer peripheral surface of the central ring 11. In the case of these oil rings 10-2 and 10-3, as in the case of the oil ring 10 shown in FIG. 4, a sufficient amount of lubricating oil can be scraped up.
Can be supplied to the sliding contact portion between the bearing and the sliding bearing 61. Also in these embodiments, the teeth 13 do not directly touch the shaft 75, and the shaft 75 is not damaged by the teeth 13.

On the other hand, any of the oil rings 10-2, 10-
Also in the case of No. 3, since the outer diameter of the teeth (external teeth) 13 of the oil ring 10 is configured to be smaller than the outer diameters of the portions on both sides thereof, the teeth 13 are located outside the oil rings 10-2 and 10-3. The upper bearing 61a (the inner peripheral surface of the ring-shaped storage recess 64) is not directly touched, and the upper bearing 61a can be reliably prevented from being damaged by the teeth 13.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and the drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and effects of the present invention are exhibited.

For example, the shapes and structures of the bearing mechanisms 60 and 65 and the shaft 75 can be variously modified. The bearing 61 does not necessarily need to be a sliding bearing, but may have other various structures. Further, in the above-described embodiment, the example in which the oil ring 10 according to the present invention is used for the bearing portion of the pump P has been described, but it goes without saying that the oil ring 10 can be similarly applied to the bearing portions of other various machines. Further, in the above embodiment, the example in which the teeth 13 are provided at equal intervals on the entire inner peripheral surface and / or the outer peripheral surface of the oil ring 10 has been described. It may be provided in some places. Further, the teeth 13 may be provided on the side surface of the oil ring 10.

[0022]

As described above in detail, according to the present invention, since the oil ring is provided with the lubricating oil scraping teeth, the amount of lubricating oil that can be scraped can be made sufficient. It can supply lubricating oil enough,
Burnout of the bearing can be reliably prevented.

In particular, if the teeth are provided in a ring shape on the inner peripheral surface and / or the outer peripheral surface of the oil ring, any one of the teeth will continuously scoop up the lubricating oil, so that the lubricating oil can be scraped more effectively. It can exhibit the raising / supplying action.

Further, since the oil ring is composed of a central ring provided with ring-shaped teeth and side rings sandwiching both sides of the central ring, the inner and outer diameters of each ring are covered so that the teeth are covered by the side rings on both sides. By setting the diameter, it is possible to extremely easily and reliably prevent the teeth of the oil ring from directly touching the shaft or the bearing and damaging them.

[Brief description of the drawings]

FIG. 1 shows a pump P using an oil ring according to the present invention.
FIG. 2 is a schematic cross-sectional view showing one example.

FIG. 2 is an enlarged schematic cross-sectional view showing an internal structure of a bearing mechanism 60 using the oil ring 10.

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

FIG. 4 is a side sectional view of the oil ring 10;

FIG. 5 is an enlarged schematic cross-sectional view showing the internal structure of the bearing mechanism 65.

FIGS. 6A and 6B are side sectional views showing oil rings 10-2 and 10-3 according to other embodiments, respectively.

FIG. 7 is an enlarged schematic cross-sectional view showing the internal structure of a shaft 80 and a bearing 85 using a conventional oil ring 100.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 oil ring 11 center ring 13 teeth 21, 31 side ring P pump 50 casing 51 oil sump chamber 53 lubricating oil 55 ball bearing (thrust bearing) 60 bearing mechanism 61 sliding bearing 61 a upper bearing 61 b lower bearing 64 ring storage recess 65 bearing Mechanism 69, 69 Opening 70 Suction casing 71 Discharge casing 73 Impeller 75 Shaft 77, 77 Seal mechanism 10-2 Oil ring 10-3 Oil ring

Claims (3)

[Claims] 1. A lubricating oil at a lower portion of a shaft is swept up and supplied to a portion of the shaft and the bearing by rotating around the shaft having an inner diameter larger than the diameter of the shaft around the shaft supported by the bearing. An oil ring as described above, wherein the oil ring is provided with lubricating oil scraping teeth. 2. The method according to claim 1, wherein the teeth are formed on an inner peripheral surface of an oil ring and / or
The oil ring according to claim 1, wherein the oil ring is provided in a ring shape on the outer peripheral surface. 3. The oil ring according to claim 2, wherein the oil ring comprises a center ring provided with ring-shaped teeth and side rings which sandwich both sides of the center ring.