JP3310938B2 - High-speed rolling bearing lubrication nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the design of a nozzle for oil lubrication in which oil gas or oil mist is applied to a rolling bearing on a high-speed main shaft.

[0002]

2. Description of the Related Art At present, there are two types of lubrication systems for high-speed rolling bearings. One is to inject lubricating oil having low tackiness directly into a bearing, and then to cool and filter the lubricating oil, and to perform an oil injection system. Is a so-called oil lubrication system. Although this method enables high-speed rotation, it requires high cost, high consumption rate, a large installation space, and also has to consider the problem of oil sealing. Therefore, unless otherwise required, most high speed rolling bearings usually employ a method of mixing air and lubricating oil. Lubrication by oil gas and oil fog is a typical method of this type. In these two methods, high-pressure air having a certain lubricating oil is directly injected into a portion of the bearing to be lubricated.
The designs of the lubricating oil gas and oil fog are different from each other, and the injection method is also different. In the former, lubricating oil and high-pressure air each flow into two independent pipes to form one mixing unit, and after the lubricating oil rises along the transport pipe due to the pressure of the high-pressure air, both are once again brought into bearings at once. Inject toward. In the latter, high-pressure air is introduced into the Venturi tube, and the lubricating oil and the air are mixed due to a pressure difference generated inside and outside the Venturi tube to form an oil mist.

[0003] The rotation function of a rolling bearing and the lubrication system are very closely related, and the rotation speed of the bearing increases under a good lubrication system and the life of the bearing body is prolonged. Very useful for lowering. The lubrication system for rolling bearings has a lubrication system such as oil, oil injection, oil mist, and oil gas. For oil and lubrication, lubricating oil with high viscosity is fed into the bearing, and the oil is spread on the surface by rotation of the bearing. Oil lubrication is slightly inferior in heat dissipation, so it can be used only on rolling bearings that rotate at medium to low speeds.If the rotation speed of the bearing is to be increased, the heat dissipation of the bearing is considered. This is an important issue that must be addressed. Because
Most high-speed rolling bearings are damaged by poor heat dissipation.

No.4057371 "Gas Turbine Drivin"
The High Speed Centrifugal Compressor Unit ”will use lubricating oil units that are journal bearings (Journal Bear
ing). The principle of journal bearing lubrication is that high-pressure lubricating oil is injected between the rotating shaft and the bearing, and when the main shaft rotates, a wedge effect occurs between the main shaft and the bearing. The lubrication is performed by disassembling the two by the positive pressure generated between the bearings. The entire lubrication process is carried out by a circulation system, so that the lubricating oil flowing out of the journal bearing flows into the oil box again and is used again. In addition, the cooling system controls the lubricating oil to an appropriate temperature.

[0005] In addition, Taiwan No. 71973 patent “spray cooling lubrication system” and No. 154639 patent “emergency lubrication spray system”, US Pat. No. 3939944 “Oil-Mist Lubrication Sys”
tem '', 4137997 `` Lubricating and Cooling System for
Spindle Bearing Assembly '', 4006944 `` Spindle Devi
and lubrication systems such as oil gas, oil fog, and oil jet are all employed when the lubrication nozzle is applied on a main shaft or other related element.

[0006]

In general, most nozzle designs for high-speed rolling bearings employ a one-point or two-point lubrication system. That is, this is a method of lubricating one bearing with one or two nozzles. This type of method tends to cause uneven heat distribution of the bearing, uneven distribution of the bearing temperature, and not only a decrease in accuracy due to thermal deformation of the bearing, but also a phenomenon of stress concentration, and the use of the bearing It has an adverse effect on life.
Since the nozzle is installed near the bearing, heat is transferred to the nozzle when the bearing generates heat, and if lubricating oil accumulates inside the nozzle passage, unnecessary temperature rise due to the accumulation of lubricating oil throughout the system And the amount of oil fluctuates. In the case of a built-in rotary shaft (the rotary shaft is installed inside the motor), the phenomenon of temperature rise becomes more serious. The effect of the air flow rate on the cooling of the bearing is extremely large, and the oil gas or oil mist lubrication system cools with a large amount of air, so that the nozzle blows the maximum amount of air under a certain pressure. When the lubricating oil can be smoothly supplied to the lubrication point, the cooling of the bearing and the acceleration of rotation are promoted. As described above, the problem to be solved by the present invention is to design a bearing lubrication nozzle that increases the heat dissipation efficiency of the bearing, averages the temperature rise of the bearing, and prevents the accumulation of oil inside.

[0007]

SUMMARY OF THE INVENTION A high-speed rolling bearing is characterized in that it has a small rotating frictional force and a small amount of tilt during rotation and is excellent in strength, and is currently generally supported and rotated in a high-speed rotating industrial machine. It is used as an important element such as a shaft and a load. For example, a high-speed main shaft of an industrial machine, a turbine engine, or the like. However, the rotational speed of this type of bearing is determined by the combination of lubrication technology, as well as the material and precision of the bearing itself.

[0008] The lubrication by oil gas or oil jet is generally applied to the lubrication technology of a high-speed rolling bearing, and its DN value (pitch circle diameter mm * rotation speed rpm) is 1.
It reaches 2 * 10 ⁶ or more. Acceleration of bearing rotation and extension of service life are closely related to the setting of lubrication system parameters and the magnitude of bearing pressurization, as well as the nozzle shape,
The design of the passage, the installation position and numerical values of the nozzle are also important factors.

[0009] Oil-gas, oil-mist or oil-lubricated lubrication systems provide for accurate delivery of lubricating oil over lubrication points.
Sometimes a lubricating nozzle is connected to the end of the transport pipe, the lubricating oil supply surface is reduced by designing the nozzle with a small diameter, and the acceleration of rotation achieves the purpose of accurate lubricating oil delivery. Oil-injected lubrication systems must take oil sealing issues into account and require a certain level of complex design,
In addition, since the consumption rate is relatively high, the present invention is designed mainly for a lubrication nozzle for oil gas or oil mist.

In view of the above, the lubricating nozzle of the present invention is
1, average distribution of bearing temperature, 2, prevention of oil accumulation inside the flow path, 3, supply of large amount of cooling air, 4, design to have a function to help lubricating oil gas or oil mist to enter the bearing accurately did.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Lubrication nozzles designed for the High-Speed Rolling-Element Bearings of the present invention have limited applicability on lubrication systems for oil gas or oil fog. The structure of the high-speed rolling bearing lubrication nozzle of the present invention is a large diameter passage, a semi-circular annular passage connected to the external transportation pipeline, a diameter changing from large to small, and a diameter divided into three equal intervals of 120 degrees , and a semi-circle. A large-diameter passage, which includes an L-shaped injection conduit connecting the annular passage and the nozzle outlet, and is connected to the external transportation conduit, is bored on a fixed bearing and a hollow cylinder for pressurization. The L-shaped injection conduit connected to the semicircular annular passage and reaching the nozzle outlet is machined with a T-shaped cross-section bearing and a ring separating the bearing.

The diameter of the injection pipe inlet divided into three equal parts at 120 degrees is in the range of 2.0 mm to 3.0 mm, and the outlet is limited to 2.0 mm or less. The large diameter passage of the bore on the hollow cylinder for pressurized and fixed bearings must be larger in diameter than the external transport line and smaller than the diameter of the semi-circular annular passage. The maximum of the rolling bearing DN value of the high-speed rolling bearing lubrication nozzle (bearing pitch circle diameter mm * rotation speed rpm) is 2.0 *
10 is a ^6.

As shown in FIG. 1, when the present invention is applied to a high-speed main spindle built in an industrial machine, the rolling bearings 1, 2, and 3 are lubricated by lubrication nozzles 4, 5, and 6, respectively. The design principles of the passages are all the same. As shown in FIG. 2, a ring 4 as a spacer is provided between the T-shaped bearings. Fuel oil pipeline 10 (11, 12)
And 13 (14, 15) are perpendicular to each other and generate lubricating oil gas or oil fog within the diameter changing from large to small, accelerate the operation, break through the bearing, and rotate between the inner and outer rings by high speed rotation. An airflow field is created and reaches the lubrication point. Oil jet line 13 (1
The injection of oil gas or oil mist with a small diameter of 4, 15) can break through the airflow obstruction on the outer periphery of the bearing, but there is also a certain limit. If the air flow rate is too small, a sufficient heat dissipation effect can be obtained. I can't. Therefore, the oil pipeline 10 (1
The diameter range of 1, 12) should be between 2.0 mm and 3.0 mm, while the diameter of the jet line 13 (14, 15) should be less than 2.0 mm.

As shown in FIG. 3, a large-diameter passage 8 is bored in the fixed bearing and the hollow cylinder 7 for pressurization, which connects the external transport line for oil gas or oil mist with the semicircular annular passage 9. It has a function to do. Its diameter is larger than the outer transport line and smaller than the diameter of the semicircular annular passage 9 to prevent oil from accumulating at the seam. Semicircular annular passage 9
Are located on the surface of the ring 4 which is a spacer between the T-shaped cross-section bearings, and have three smooth oil-oil or oil mist equally divided into 120 degrees by their smooth and smooth shape.
0 (11, 12). Although the semicircular annular passage 9 is originally designed on the inner wall of the fixed bearing and the seven hollow cylinders for pressurization, it is considered that the outer circle is easier to machine than the inner circle of the lathe, and in the present invention, This passage was designed on the surface of the ring 4 which is a spacer between the T-shaped cross-section bearings.

[0015]

The present invention is characterized by the design of a passage having a diameter that varies from small to large in a pipeline for transporting oil gas or oil mist, a method of conducting a semicircular annular passage, and a three-point oil lubrication system. Have. As shown in FIG. 4, the temperature of the entire bearing is efficiently lowered, the phenomenon of stress concentration due to uneven thermal deformation is reduced, and the fluctuation of the amount of oil due to the accumulation of oil inside and the rise in temperature inside the nozzle are prevented. At the same time, the rotation of the bearing can be accelerated to extend the service life of the bearing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lubrication system when the present invention is applied to a high-speed main bearing with built-in industrial machines.

FIG. 2 is a cross-sectional side view of a T-shaped bearing in FIG. 1 and a spacer (Spacer) between the bearings.

FIG. 3 is a front cross-sectional view of the entire nozzle, in which FIG.

FIG. 4 is a graph illustrating the effect of the number of oil injection conduits on the temperature rise distribution of a bearing according to the present invention.

[Explanation of symbols]

 1, 2, 3 Rolling bearings 4, 5, 6 Lubrication nozzle (ring) 7 Hollow cylinder 8 (Large diameter) passage 9 Semi-circular annular passage 10, 11, 12, 13, 14, 15 Fuel oil pipeline

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 33/66 F16N 7/32

Claims (2)

(57) [Claims] 1. An external transportation pipeline for transporting oil to a lubrication nozzle of a high-speed rolling bearing, a large-diameter passage connected immediately downstream of the external transportation pipeline, and a semicircle connected immediately downstream of the large-diameter passage. together configured to bore an annular passage downward flow increases, the annular passage 120 degrees 3 equal parts
Three L-shaped oil injection pipelines that change from large to small
Fast rolling bearing lubrication nozzles, characterized in that it includes. 2. An oil jet line connected downstream of the semicircular annular passage has an inlet diameter in a range of 2.0 mm to 3.0 mm, and an outlet diameter of the oil jet line is less than 2.0 mm. The lubricating nozzle for a high-speed rolling bearing according to claim 1, wherein