JPS6272995A - Bearing oil feed device - Google Patents

Abstract

PURPOSE:To make it possible to surely lubricate a bearing, by fitting a ring formed therein with an oil chamber extending to the inner peripheral surface thereof, loosely onto the outer periphery of a disc provided on a rotary shaft, and by communicating the oil chamber at one end with an oil tank and at the other end with a bearing oil feed hole. CONSTITUTION:A ring 8 is fitted loosely, that is, with a slight gap, onto the outer periphery of a disc 7 formed on one part of a rotary main shaft 1 journalled to the inside of a housing 4 for a bearing oil feed device. An oil chamber 9 is formed in the inner periphery of the ring 8, extending the upper section to the lower section thereof and therealong in a range of 180deg. The oil chamber 9 is communicated at one end with an oil tank 5 through a suction port 11 and at the other end with a bearing oil feed hole 15 through a discharge port 12 and an oil feed pipe line 14. When the rotary main shaft 1 rotates, viscous pump action is effected in the oil chamber 9, and therefore, oil is surely fed from the oil tank 5 into the bearing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a horizontal shaft rotating machine, and more particularly to an oil supply device that houses lubricating oil in a casing and supplies it to a bearing.

[Background of the invention]

Conventionally, the lubricating methods for large electric motors, etc. have been to install an oil ring inside the bearing and pump lubricating oil from an oil tank and supply it to the bearing, or to install a lubricating device externally and force lubricating using a pump, etc. has been adopted.

However, the oil ring method has poor followability in high-speed ranges and the amount of oil supplied decreases in high-speed ranges, so it is not suitable for high-speed machines. On the other hand, the forced lubrication method provides a sufficient amount of lubrication, but requires incidental equipment such as a pump, oil tank, and piping, making it expensive.

A conventional bearing oil supply device, as described in Japanese Unexamined Patent Publication No. 55-65721, has a pump wheel attached to a rotating main shaft,
The pump has a structure in which a groove forming a pump chamber, a pad having an inlet port and a discharge port are brought into close contact with the outer periphery of the pump wheel.
Additionally, the pump section is installed inside the lubricating oil, and the pump discharge port is communicated with the bearing surface.

It was designed to be refueled.

In this method, the pump part is always submerged in oil, so the supply of lubricating oil is stable. However, since part of the pump wheel also comes into contact with oil, there is a problem that stirring loss increases as the rotation speed increases. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing oil supply device that increases the amount of lubricant supplied to a bearing without stirring the lubricating oil and supplies the lubricating oil stably.

[Summary of the invention]

The present invention comprises an oil disk formed on a rotating main shaft near a bearing, and a ring that is swingably held with a predetermined gap from the oil disk, and this ring has an oil chamber in the center of its inner peripheral surface. The oil chamber has an inlet at the bottom that communicates with the lubricating oil, an outlet at the top that communicates with the bearing oil supply hole, and oil grooves parallel to the oil chamber on both sides of the oil chamber. , only at the bottom □Provide a suction port that communicates with the lubricating oil.

As a result, the main shaft of rotation is used as a pump shaft, and the pump action is performed by the viscous flow in the oil chamber provided on the inner peripheral surface of the ring.

By the way, since conventional viscous pumps are installed in lubricating oil, no air bubbles get mixed into the oil chamber, and reliable pumping action can be expected, but on the other hand, part of the oil disc also comes into contact with the oil, resulting in an increase in rotational speed. As a result, stirring loss increases. In order to prevent this agitation loss, it is necessary to lower the oil level so that the oil disc does not come into contact with the lubricating oil, but in this case, both end faces of the ring are also exposed to the air, so air bubbles are formed in the oil chamber from both end faces. There was a problem that the viscosity pumping effect was reduced due to the contamination of the viscosity.

The present invention provides a bearing oil supply device in which oil grooves are provided on both sides of the oil chamber and pressure is generated in the oil grooves to prevent air bubbles from entering from both end surfaces of the ring and to provide a stable pumping action. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. A main shaft 1 of the horizontal axis rotating machine is supported by a split bearing 2, and the outer peripheral portion of the bearing 2 is installed in a casing 4 via a bearing frame 3.

Further, the casing 4 contains lubricating oil 5 to the extent that the lower part of the bearing 2 is immersed therein. Furthermore, labyrinth seals 6 are attached to the left and right side walls of the casing 4 to prevent the lubricating oil 5 from escaping.

To supply oil to the bearing 2, an oil disk 7 having a larger diameter than the journal portion is attached to the rotating main shaft 1 and rotates together with the rotating main shaft 1. A ring 8 is arranged on the oil disk 7 with a predetermined gap, and the ring is provided with an oil chamber 9 and oil grooves 10a and 10b on its inner peripheral surface. The lower part of the oil chamber 9 has a suction port 11 that communicates with the lubricating oil, and the upper part has a discharge port 12.
The discharge port 12 communicates with the oil supply hole 15 installed in the bearing 2 through the oil supply plumber 4.

Further, the oil grooves 10a and 10b are provided at both ends of the oil chamber 9, and the suction ports 11a and llb are provided only at the lower part. The structure of the inner circumferential surface of the ring is shown in more detail in FIG. 2. The oil chamber 9 and oil grooves 10a, 10b are formed approximately half the circumference of the annular ring 8, and the suction port 11 is connected to the oil chamber 9 and Each is in communication with lubricating oil 5. Also,
Oil groove 10a.

10b also has a suction port 11a at almost the same position as the oil chamber 9.

11b is provided, but the upper part has a poor discharge port.

It has a dammed structure.

Further, the ring 8 is held by a stopper 16 in a freely movable state so as to follow the oil disk 7 so as not to rotate due to viscous friction of the lubricating oil 5.

The operating principle of the bearing oil supply device will be explained below. First, when 5 revolutions up @ 1 starts, the oil level is initially set at a position where the lower part of the oil disc 7 is slightly exposed.
The suction port 11 at the bottom of the ring 8 and the bottom of the oil chamber 9 are filled with lubricating oil 5. When the oil disk 7 rotates, the lubricating oil 5 in the oil chamber 9 is pulled by the oil disk 7 due to its viscosity. , flows in the rotational direction in the oil chamber 9 and flows into the bearing oil supply hole 15 from the upper discharge port 12 via the oil supply pipe 14. On the other hand, the suction port 11a at the bottom of the oil grooves 10a and 10b
, llb, the lubricating oil 5 is pulled in the rotational direction by the oil disk 7 similarly to the oil chamber 9 and flows upward. However, since the oil grooves 10a and 10b are blocked above, the pressure of the lubricating oil 5 in the oils 1110a and 10b increases as shown by the two-dot chain line in FIG. Therefore, the oil groove 10a.

The lubricating oil in 10b is discharged in the axial direction due to the pressure difference, and one side is discharged from the oil chamber 9 and the other side is discharged from the end face of the ring 8.

FIG. 4 illustrates the effects of the present invention in more detail.
a) shows the flow of lubricating oil 5 and air in a ring with a conventional structure. In the conventional structure, the lubricating oil (black arrow) flowing in the oil chamber 9 is almost equal to atmospheric pressure, so air (white arrow) is mixed in from both end faces of the ring 8.The air flowing into the oil chamber 9 makes one rotation. It forms an air layer in the direction, inhibiting the viscous pumping action. According to experiments, it has been confirmed that when an air layer is formed in the oil chamber, the amount of oil supplied decreases by about one-third, and in the case of such viscous pumps, it is important to know how to prevent air from entering. This is an important point. on the other hand,
In (b), oil #10a is on both sides of the oil chamber 9.

10b, a pressurized oil film is always formed at both ends of the ring 8, thereby preventing intrusion of external air.

Moreover, compared to the case where a general seal member or the like is used, there is no risk of damage such as friction, wear, seizure, etc., and stable oil supply characteristics can be obtained.

Note that the oil chamber 9 does not need to be in one stage, but can be multi-stage, and by communicating each oil chamber, it is also possible to further increase the amount of oil supplied.

〔Effect of the invention〕

According to the present invention, it is possible to lower the lubricating oil level,
A bearing oil supply device without stirring loss can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partial perspective view of FIG. 1, and FIGS. 3 and 4 are explanatory diagrams showing the characteristics of the present invention.

Claims (1)

[Scope of Claims] 1. A bearing device comprising a bearing that supports the rotating main shaft of a horizontal axis rotating machine, an oil tank that houses the bearing and contains lubricating oil, and an oil supply device, wherein the oil supply device The device is composed of a disk provided on the rotating main shaft and a ring that is held movably while maintaining a predetermined gap between the disk and the disk, and this ring forms an oil chamber in the center of the inner circumferential surface, and
A suction port and a discharge port are provided at the top and bottom of the oil chamber, the suction port is below the oil level, the discharge port is communicated with the bearing oil supply hole, and a suction port is provided at both ends of the oil chamber parallel to the oil chamber. form an oil groove,
A bearing oil supply device characterized in that a suction port is communicated with a lower part of the oil groove below the oil surface. 2. The bearing oil supply device according to claim 1, wherein a plurality of the oil chambers are arranged in the circumferential direction.