JP2002213687A - Bearing lubricating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing lubricating device, capable of supplying a very small quantity of lubricating oil, without the use of air. SOLUTION: The bearing lubricating device is for rolling bearings 1, supporting a rotary shaft and is equipped with an oil-storing chamber 5 to temporarily store the oil supplied from a tank 9, a diaphragm 4 to form part of the wall which constitutes the oil storing chamber 5, a nozzle 6 formed in that part of the chamber wall excluding the diaphragm 4, and a piezoelectric element 7 to give vibration to the diaphragm 4. The nozzle 6 is formed facing each rolling bearing 1, and from the nozzle, the lubricating oil is sprayed directly onto the roller element 1b of the bearing 1 and/or the raceway surfaces of its rings 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a rolling bearing for rotatably supporting a main shaft in a machine tool such as a machining center.

[0002]

2. Description of the Related Art Conventionally, an oil-air lubrication device has been used as a lubrication device for a high-speed rolling bearing that rotatably supports a main shaft of a machine tool. The oil-air lubrication device blows lubricating oil onto a rolling element of a rolling bearing and a raceway surface of a bearing ring together with a large amount of air. Lubricating oil is supplied to an air supply passage by a piston pump or the like.

[0003]

However, in the conventional apparatus, since the supply of the lubricating oil to the air supply path is performed by the discharge from the piston type pump, the discharge amount per one time to the air supply path is small. Relatively large. As a result, an excessive amount of lubricating oil is supplied to the rolling bearing, and the calorific value of the bearing increases, which may cause a problem such as thermal displacement of the main shaft. In order to reduce the calorific value of the rolling bearing, it is effective to discharge the lubricating oil to the air supply path at regular intervals, but in this case, the mixing ratio of the lubricating oil to the air is not uniform, and The amount of heat generated periodically increases in synchronization with the oil discharge interval, and the bearing temperature increases.

When the amount of air and lubricating oil supplied to the rolling bearing increases, the lubricating oil becomes ultrafine particles of 10 μm or less and leaks in large quantities together with the air into the factory. May be adversely affected. Further, when air is directly discharged to the rolling elements of the rolling bearing, loud noise is generated.

An object of the present invention is to provide a bearing lubricating device which solves the above-mentioned problems, prevents the supply of excessive lubricating oil to rolling bearings, reduces mist leakage, and prevents generation of loud noise. Is to do.

[0006]

A bearing lubricating apparatus according to the first aspect of the present invention is a lubricating apparatus for a rolling bearing that supports a rotating shaft, and temporarily stores lubricating oil supplied from a lubricating oil tank. A lubricating oil storage chamber, a diaphragm that forms part of a wall that forms the lubricating oil storage chamber, a nozzle that is formed on a part of the wall that forms the lubricating oil storage chamber excluding the diaphragm, and vibration that imparts vibration to the diaphragm The nozzle is formed toward the rolling bearing so that the lubricating oil is directly blown through the nozzle to the rolling element of the rolling bearing and / or the raceway surface of the bearing ring.

[0007] According to the bearing lubrication device of the first aspect of the invention,
The diaphragm is vibrated by the vibration imparting means, and the lubricating oil stored in the lubricating oil storage chamber is discharged from the nozzle, so that the discharge amount per one time from the nozzle is smaller than in the conventional case. Thus, an appropriate amount of lubricating oil can be supplied to the rolling bearing. Therefore, the calorific value of the rolling bearing is reduced, and the problem such as thermal displacement does not occur on the main shaft. In addition, it becomes possible to supply lubricating oil to rolling bearings at short intervals,
It is possible to prevent the heat value of the bearing from changing periodically.

Further, since the lubricating oil is directly supplied to the rolling bearing, a compressor for generating air is not required unlike the case where a large amount of air is used to supply the lubricating oil to the bearing, leading to power consumption. Energy saving can be achieved. In addition, unlike a case where a large amount of air is used to supply lubricating oil to a bearing, the lubricating oil does not become ultra-fine particles and leak in a large amount together with the air into the factory, thereby reliably preventing the work environment from deteriorating. be able to. Further, since no air is used, generation of loud noise due to air can be prevented.

According to a second aspect of the present invention, in the bearing lubricating apparatus according to the first aspect of the present invention, the vibration applying means comprises a piezoelectric element. In this case, the discharge amount can be arbitrarily changed by controlling the voltage applied to the piezoelectric element, and the discharge interval can be arbitrarily changed by controlling the cycle of applying the voltage.

According to a third aspect of the present invention, there is provided a bearing lubricating apparatus according to the first aspect, wherein the vibration applying means includes a permanent magnet attached to the outer surface of the diaphragm and a lubricating oil storage chamber which attracts and repels the permanent magnet. And an electromagnet arranged outside. In this case, the discharge amount can be arbitrarily changed by controlling the voltage applied to the electromagnet, and the discharge interval can be arbitrarily changed by controlling the cycle of applying the voltage.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the left and right of each drawing are referred to as left and right. Further, the same components and portions are denoted by the same reference symbols throughout the drawings, and redundant description will be omitted.

FIG. 1 shows a first embodiment of a bearing lubrication device according to the present invention.
An embodiment will be described.

In FIG. 1, a bearing lubricating device is, for example, a lubricating oil discharging device (2) for discharging lubricating oil toward a rolling bearing (1) rotatably supporting a main shaft (not shown) of a machine tool.
It has. A diaphragm (4) is mounted in the casing (3) of the lubricating oil discharge device (2) so as to partition the inside of the casing (3) into two parts on the left and right sides, and the left side of the diaphragm (4) in the casing (3). Part is the lubricating oil storage room
(5). On the left side wall (3a) of the casing (3), there is formed a nozzle (6) facing between the inner and outer races (1a) of the rolling bearing (1). A piezoelectric element (7) serving as a vibration applying means for applying vibration to the diaphragm (4) is arranged in a portion between the diaphragm (4) and the right side wall (3b) in the casing (3). An AC power supply (8) is connected to the piezoelectric element (7). In addition, instead of the AC power supply (8), the piezoelectric element (7)
A rectangular wave power supply may be connected.

A lubricating oil supply pipe (10) extending from a lubricating oil tank (9) is connected to the lubricating oil storage chamber (5). In the middle of the lubricating oil supply pipe (10), the pump (11)
A check valve (13) that opens only to the relay tank (12) and the lubricating oil storage chamber (5) is provided.

In the bearing lubricating apparatus having the above structure, the lubricating oil is supplied from the oil tank (9) to the relay tank (12) by the pump (11).
And stored here once. In this state the piezoelectric element
When an AC voltage is applied to (7), the piezoelectric element (7) is periodically displaced, which causes the diaphragm (4) to vibrate and lubricate the lubricating oil storage chamber (5) from the relay tank (12). The suction of oil and the discharge of lubricating oil from the nozzle (6) to the rolling bearing (1) are alternately performed in a very short cycle, and the rolling element (1b) and / or the race of the rolling bearing (1) are used. Lubricating oil is supplied directly to the raceway surface of (1a). Therefore, it is possible to prevent the heat generation amount of the bearing (1) from periodically changing. In addition, since the amount of lubricating oil discharged per time can be adjusted by the type of the piezoelectric element (7) and the magnitude of the applied voltage, an appropriate amount of lubricating oil can be applied to the rolling bearing (1). As a result, the calorific value of the bearing (1) is reduced, and problems such as thermal displacement do not occur on the main shaft. Further, unlike the case where a large amount of air is used to supply the lubricating oil to the bearing, a compressor that generates air is not required, which leads to power consumption and energy saving. Also, unlike the case where a large amount of air is used to supply lubricating oil to bearings, the lubricating oil does not become ultra-fine particles and leak into the factory together with air, so that the working environment can be reliably prevented from deteriorating. it can.

FIG. 2 shows a second embodiment of the bearing lubrication apparatus according to the present invention.
An embodiment will be described.

In the case of this embodiment, in order to apply vibration to the diaphragm (4), the piezoelectric element of the first embodiment is used.
Instead of (7), a permanent magnet (20) attached to the right side of the diaphragm (4) and an inner surface of the right side wall (3b) of the casing (3) were attached to face the permanent magnet (20). electromagnet
(21) is provided. electromagnet
(21) is connected to an AC power supply (8). Other configurations are the same as those of the above-described first embodiment.

In the bearing lubricating apparatus according to the second embodiment, the lubricating oil is supplied from the oil tank (9) to the relay tank by the pump (11).
It is sent to (12) and temporarily stored here. When an AC voltage is applied to the permanent magnet (20) in this state, the permanent magnet (20) and the electromagnet (21) periodically attract and repel, whereby the diaphragm (4) is vibrated, and the relay tank (12) ), The lubricating oil is sucked into the lubricating oil storage chamber (5) and the lubricating oil is discharged from the nozzle (6) to the rolling bearing (1) alternately in a very short cycle. Lubricating oil is supplied directly to the raceway surface of the rolling element (1b) and / or the race (1a) of (1).

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of a bearing lubrication device according to the present invention.

FIG. 2 is a schematic view showing a second embodiment of the bearing lubrication device according to the present invention.

[Explanation of symbols]

 (1): Rolling bearing (1a): Raceway (1b): Rolling element (2): Lubricating oil discharge device (4): Diaphragm (5): Lubricating oil storage chamber (6): Nozzle (7): Piezoelectric element (9): Lubricating oil tank (20): Permanent magnet (21): Electromagnet

Claims (3)

[Claims] 1. A lubricating device for a rolling bearing that supports a rotary shaft, wherein the lubricating oil storage chamber temporarily stores lubricating oil supplied from a lubricating oil tank, and a part of a wall that forms the lubricating oil storage chamber. A diaphragm, a nozzle formed at a portion of the wall constituting the lubricating oil storage chamber other than the diaphragm, and vibration applying means for applying vibration to the diaphragm, wherein the nozzle is formed toward a rolling bearing, A bearing lubricating device in which oil is blown directly through a nozzle onto a rolling element of a rolling bearing and / or a raceway surface of a bearing ring. 2. The bearing lubrication device according to claim 1, wherein said vibration applying means comprises a piezoelectric element. 3. The bearing lubricating device according to claim 1, wherein the vibration applying means comprises a permanent magnet attached to the outer surface of the diaphragm, and an electromagnet disposed outside the lubricant oil storage chamber so as to attract and repel the permanent magnet. .