JP2009243501A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device certainly supplying the appropriate amount of lubricating oil without an excess or shortage. <P>SOLUTION: This rolling bearing device 3 rotatably supporting a spindle 2 with respect to a housing 1 includes an inner ring 31, an outer ring 32, and a plurality of rolling elements 33 arranged between the inner ring 31 and the outer ring 32. The outer ring 32 is provided with porous bodies 35 provided on adjacent surfaces 32b located adjacently to the rolling raceway surfaces 32a of the rolling element 33, and supply conduits 36 supplying lubricating oil to the porous bodies 35. Each of the porous bodies 35 has a lubricating oil supply port 35a formed in the surface of an exposed surface on the side of each rolling raceway surface 32a, and a blocking layer 35b provided on the surface of the exposed surface except for the lubricating oil supply port 35a for blocking the lubricating oil. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing device that is preferably employed in, for example, a spindle device of a machine tool.

  Conventionally, for example, a rolling bearing device that rotatably supports a spindle (rotating shaft) on a housing has been widely adopted as a spindle device of a machine tool, and various types such as an angular ball bearing and a roller bearing are known. ing. These rolling bearing devices include an inner ring that is fitted on the outer periphery of the rotating shaft, an outer ring that is fitted on the inner circumference of the housing, and a plurality of rolling elements disposed between the inner ring and the outer ring. .

  In this rolling bearing device, since the spindle rotates at a high speed, lubrication with a lubricating oil or the like is indispensable in order to prevent seizure of the rolling elements. As a lubrication method, an oil-air lubrication method (see Patent Document 1) for supplying air containing lubricating oil to the bearing, an oil mist lubrication method for supplying mist-like oil to the bearing, and spraying oil toward the bearing There are a jet lubrication method and a grease lubrication method in which grease is sealed in a bearing.

  By the way, in the case of the oil-air lubrication method, the oil mist lubrication method, and the jet lubrication method, the lubricating oil is usually supplied from a nozzle provided in an outer ring spacer disposed between two bearings. The

  However, in this case, the nozzle is located far from the rolling raceway surface of the rolling element to which the lubricating oil is to be supplied, and the lubricating oil is supplied from a certain phase. In order to secure the supply amount of lubricating oil necessary for the bearing, there is a problem that a large amount of lubricating oil or air containing lubricating oil must be supplied from the nozzle. On the contrary, if the supply amount of the lubricating oil is too large, a situation occurs in which the bearing generates heat due to the stirring heat of the lubricating oil. Therefore, supply of an appropriate amount of lubricating oil is required.

  Patent Document 1 discloses that a part of the porous material is exposed inside the air pipe, and a small amount of lubricating oil that has permeated through the porous material is continuously supplied to the air pipe. ing. However, in this case as well, the nozzle is disposed at a position far away from the rolling raceway surface, so the above problem cannot be solved.

On the other hand, in the case of the grease lubrication method, seizure occurs when the grease existing on the rolling raceway surface is exhausted, so that it is not suitable for a high-speed spindle.
JP 2001-241451 A

  This invention is made | formed in view of the said situation, and makes it the problem which should be solved to provide the rolling bearing apparatus which enabled it to supply the appropriate quantity lubricant oil reliably without excess and deficiency.

  Hereinafter, each means suitable for solving the above-described problems will be described while adding effects and the like as necessary.

  [Means 1] The invention according to the means 1 includes an inner ring, an outer ring, and a plurality of rolling elements disposed between the inner ring and the outer ring, and rotatably supports the rotation shaft with respect to the housing. In the rolling bearing device, the inner ring or the outer ring includes a porous body provided on an adjacent surface adjacent to a rolling raceway surface of the rolling element, and a supply pipe for supplying lubricating oil to the porous body. It is characterized by having.

  According to the means 1, since the inner ring or the outer ring includes the porous body and the supply pipe, the lubricating oil supplied from the supply pipe to the porous body stays in the pores of the porous body. Is done. This makes it possible to supply a certain appropriate amount of lubricating oil from the porous body to the rolling raceway surface. Therefore, it is possible to reliably and stably supply an appropriate amount of lubricating oil without excess or deficiency from the porous body to the rolling raceway surface.

  In addition, as a porous body in this invention, a metal sintered compact, graphite, carbon etc. can be employ | adopted suitably, for example. This porous body is provided not on the rolling raceway surface of the rolling element, but on an adjacent surface adjacent to the rolling raceway surface, but more reliably supplies lubricating oil from the porous body to the rolling raceway surface. For this purpose, it is preferable to provide it as close as possible to the rolling raceway surface.

  [Means 2] In the invention according to means 2, the porous body in the rolling bearing device according to means 1 has a lubricating oil supply port formed by clogging in a part of the exposed surface. It is characterized by.

  According to the means 2, the lubricating oil supply port is suppressed so as to be less clogged than the main body of the porous body so that the amount of lubricating oil flowing is smaller. Accordingly, excessive outflow is suppressed from the lubricating oil supply port, and an appropriate amount of lubricating oil is supplied to the rolling raceway surface. Therefore, it is possible to reduce the consumption amount of the lubricating oil, and it is possible to suppress the heat generation of the bearing due to the stirring heat of the lubricating oil. When the main body part of the porous body and the lubricating oil supply port are viewed as pipes through which the lubricating oil flows, the cross-sectional area perpendicular to the flow direction of the lubricating oil in the pipe line is from the main body part of the porous body. However, the lubricating oil supply port is smaller.

  The lubricating oil supply port can be easily formed by, for example, grinding or cutting the surface portion of the porous body. This lubricating oil supply port can control the amount of lubricating oil supplied by changing the amount of clogging caused by clogging.

  [Means 3] The invention according to means 3 is the lubricating oil supply port in which the porous body in the rolling bearing device according to means 1 or 2 is provided on a surface portion of the exposed surface on the rolling raceway surface side. And a non-permeable layer that blocks the lubricating oil provided on a surface portion of the exposed surface excluding the lubricating oil supply port.

  According to the means 3, since the lubricating oil retained and retained in the pores of the porous body can be prevented from leaking from the surface of the porous body by the non-permeable layer, the waste of the lubricating oil can be reduced. it can. Thereby, it becomes possible to maintain the supply of an appropriate amount of lubricating oil from the lubricating oil supply port of the porous body to the rolling raceway surface over a long period of time. In addition, this non-permeable layer can be easily formed, for example, by clogging the surface portion of the porous body by grinding or cutting.

  [Means 4] The invention according to means 4 is characterized in that the porous body in the rolling bearing device according to any one of means 1 to 3 is continuously provided in the circumferential direction.

  According to the means 4, since it becomes possible to supply lubricating oil to the rolling raceway surface from the whole area of the circumferential direction, it becomes possible to supply lubricating oil more reliably to the entire area of the rolling raceway surface.

  [Means 5] The invention according to means 5 is the outer ring in which the porous body and the supply pipe line in the rolling bearing device according to any one of means 1 to 4 are attached to the housing on the fixed side. It is characterized by being provided.

  According to the means 5, it is possible to easily produce the porous body and the supply pipeline, and the durability is also improved.

  [Means 6] In the invention according to means 6, the porous body and the supply pipe line in the rolling bearing device according to any one of means 1 to 4 are mounted on the rotating shaft on the rotating side. It is provided on the inner ring.

  According to the means 6, the supply of the lubricating oil from the lubricating oil supply port of the porous body to the rolling raceway surface can be made smoother by utilizing the centrifugal force generated when the rotating shaft rotates.

  [Means 7] A spindle device according to the invention of means 7 is characterized in that the rolling bearing device according to any one of means 1 to 6 is used.

  According to the means 7, a spindle device having a rolling bearing device capable of reliably and stably supplying an appropriate amount of lubricating oil without excess or deficiency from the porous body to the rolling raceway surface is realized. Can do. Moreover, when the rolling bearing apparatus as described in the means 2-6 is used, said effect | action and effect according to the characteristic of each rolling bearing apparatus as described in the means 2-6 can be acquired.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a partial cross-sectional view showing a main part of a spindle device to which the rolling bearing device according to the first embodiment is applied, and FIG. 2 is a cross-sectional view of the rolling bearing device according to the first embodiment.

  As shown in FIG. 1, the main shaft device includes a housing 1, a spindle (rotating shaft) 2, two rolling bearing devices 3 and 3 that rotatably support the spindle 2 on the housing 1, and an inner ring spacer 21. Inner ring fixing nuts 22a and 22b, outer ring spacers 23, outer ring fixing nuts 24a and 24b, and an outer ring holding lid 25 are provided.

  The housing 1 is formed in a substantially cylindrical shape and is divided into a plurality of parts in the axial direction. A housing 1 shown in FIG. 1 is a front housing disposed on the front side. In the upper part of the housing 1, two lubricating oil supply passages 1 a and 1 a communicating with the supply pipes 36 and 36 of the respective rolling bearing devices 3 and 3 provided radially inward and penetrating in the radial direction are provided. Is provided.

  The spindle 2 is a substantially cylindrical member for transmitting the rotation of a motor (not shown) to the holder 11 attached to the tip of the spindle 2. The motor is constituted by a rotor (not shown) mounted on the outer periphery of the substantially central portion in the axial direction of the spindle 2 and a stator (not shown) disposed on the inner periphery of the housing 1 so as to face the rotor. The spindle 2 is rotationally driven by this motor.

  The spindle 2 is accommodated in the housing 1, and is provided to the housing 1 by two rolling bearing devices 3 and 3 disposed on the front side and a rolling bearing device (not shown) disposed on the rear side. And is supported rotatably. A clamp unit 12 for clamping the holder 11, a push rod 13 for operating the clamp unit 12, and a draw bar 14 are accommodated on the front side inside the spindle 2.

  The rolling bearing devices 3 and 3 employ angular ball bearings as shown in FIG. The rolling bearing device 3 includes an inner ring 31, an outer ring 32, a plurality of rolling elements 33 disposed between the inner ring 31 and the outer ring 32, and a cage 34 that holds the rolling elements 33. Rolling raceway surfaces 31 a and 32 a that roll while the rolling element 33 is in contact are formed on the outer peripheral surface of the inner ring 31 and the inner peripheral surface of the outer ring 32 so as to make one round in the circumferential direction. Adjacent surfaces adjacent to both sides of each rolling track surface 31a, 32a are stepped via each rolling track surface 31a, 32a.

  A porous body 35 is provided on one of the adjacent surfaces adjacent to the rolling raceway surface 32a of the outer ring 32 (the adjacent surface on the axially outer side where no load acts from the rolling element 33) 32b. ing. The porous body 35 is formed of a metal sintered body into a ring shape having a predetermined width and thickness and continuously extending in the circumferential direction. The porous body 35 is adhered to the adjacent surface 32b with an adhesive so as to cover substantially the entire region.

  In order to bring out the bearing performance as designed, it is important to appropriately select materials for the inner ring 31 and the outer ring 32 and to accurately process a portion that receives a load such as the rolling raceway surface 32a. When the porous body 35 is provided on the adjacent surface on the inner side in the axial direction on which a load due to the pressing of the rolling element 33 is applied, there is a possibility that the bearing performance as designed cannot be obtained. Therefore, it is desirable to provide the porous body 35 on the adjacent surface on the outer side in the axial direction opposite to the side on which the rolling element 33 is pressed as described above.

  A lubricating oil supply port 35a formed by clogging the surface of the porous body 35 is provided on the surface of the exposed surface of the porous body 35 on the side of the rolling raceway surface 32a. ing. The lubricating oil supply port 35 a is clogged so that the amount of lubricating oil flowing is less than that of the main body of the porous body 35. The lubricating oil supply port 35a is formed adjacent to the rolling raceway surface 32a so as to make one round in the circumferential direction.

  On the surface portion of the exposed surface of the porous body 35 excluding the lubricating oil supply port 35a, a non-permeable layer 35b that prevents the lubricating oil from passing is provided. This non-permeable layer 35b is formed by clogging the surface portion of the porous body 35, and the lubricating oil retained and retained in the pores of the main body portion of the porous body 35 is exposed. To prevent leakage.

  Further, the outer ring 32 is provided with a supply pipe line 36 formed so as to penetrate in the radial direction and have an opening on the inner peripheral side communicating with the porous body 35. The supply pipe 36 supplies lubricating oil to the porous body 35.

  The two rolling bearing devices 3, 3 configured in this way constitute one set, and are arranged in a radial gap portion between the housing 1 and the spindle 2. In this case, in each rolling bearing device 3, 3, the inner rings 31, 31 are fitted on the outer circumference of the spindle 2, and the outer rings 32, 32 are fitted on the inner circumference of the housing 1. On the other hand, the front side of the spindle 2 is rotatably supported.

  The inner rings 31, 31 of the rolling bearing devices 3, 3 are positioned in the axial direction by inner ring spacers 21 disposed between them and inner ring fixing nuts 22a, 22b disposed on both sides in the axial direction. Further, the outer rings 32, 32 of the rolling bearing devices 3, 3 include an outer ring spacer 23 disposed between them, outer ring fixing nuts 24 a, 24 b disposed on both sides in the axial direction, and a front side opening of the housing 1. It is positioned in the axial direction by an outer ring holding lid 25 attached to the portion.

  Further, the supply pipes 36 and 36 provided in the outer rings 32 and 32 and the lubricating oil supply paths 1a and 1a provided in the housing 1 are connected. Thus, the lubricating oil is supplied from the lubricating oil supply passages 1a and 1a to the porous bodies 35 and 35 through the supply pipes 36 and 36, and the lubricating oil stays in the pores of the porous bodies 35 and 35. And held. The lubricating oil retained in the porous bodies 35 and 35 leaks from the surfaces of the porous bodies 35 and 35 by the non-permeable layers 35b and 35b provided on the exposed surfaces of the porous bodies 35 and 35. Is prevented. Therefore, an appropriate amount of lubricating oil is reliably and stably supplied to the rolling raceway surfaces 32a and 32a from the lubricating oil supply ports 35a and 35a provided adjacent to the rolling raceway surfaces 32a and 32a. The

  As described above, according to the rolling bearing devices 3 and 3 of the present embodiment, the outer rings 32 and 32 include the porous bodies 35 and 35 and the supply pipes 36 and 36. The lubricating oil supplied and held in the pores of the porous bodies 35 and 35 from 36 can be reliably and stably supplied to the rolling raceway surfaces 32a and 32a.

  In particular, the porous bodies 35 and 35 of the present embodiment are provided with the lubricating oil supply ports 35a and 35a that are suppressed so that the amount of the lubricating oil flowing is smaller than that of the main body portion. Since the lubricating oil does not flow out excessively from the supply ports 35a, 35a, the consumption amount of the lubricating oil can be reduced, and the heat generation of the bearing due to the stirring heat of the lubricating oil can be suppressed.

  In addition, each porous body 35, 35 is provided with a non-permeating layer 35b, 35b that prevents lubricating oil from being provided on the surface portion of the exposed surface excluding the lubricating oil supply ports 35a, 35a. , 35 can be prevented from leaking from the surfaces of the porous bodies 35, 35. Thereby, it becomes possible to maintain the supply of an appropriate amount of lubricating oil from the lubricating oil supply ports 35a and 35a of the porous bodies 35 and 35 to the rolling raceway surfaces 32a and 32a for a long period of time.

  Moreover, since each porous body 35, 35 is provided continuously in the circumferential direction, lubricant can be supplied to each rolling raceway surface 32a, 32a from the entire circumferential direction. Lubricating oil can be more reliably supplied to the entire raceway surfaces 32a and 32a.

  Further, in the present embodiment, the porous bodies 35 and 35 and the supply pipes 36 and 36 are provided on the outer rings 32 and 32 attached to the housing 1 on the fixed side in the spindle device. The porous bodies 35 and 35 and the supply pipes 36 and 36 can be easily manufactured, and the durability is also improved.

  According to the spindle device of the present embodiment, an appropriate amount of lubricating oil can be reliably and stably supplied from the porous bodies 35, 35 to the rolling raceway surfaces 32a, 32a. A spindle device provided with the rolling bearing devices 3 and 3 can be realized.

[Embodiment 2]
FIG. 3 is a partial cross-sectional view of a spindle device to which the rolling bearing device according to the second embodiment is applied. The rolling bearing device 5 according to the embodiment includes an inner ring 51, an outer ring 52, a plurality of rolling elements 53, and a cage 54, and the basic configuration is the same as that of the first embodiment, but is on the rotating side in the spindle device. The second embodiment is different from the first embodiment in that a porous body 55 and a supply pipe 56 are provided for the inner ring 51 mounted on the outer peripheral surface of the spindle (rotating shaft) 2. Therefore, members and the like that are common to the first embodiment are given the same reference numerals in FIG. 3 and will not be described in detail, and different points will be mainly described below.

  In the present embodiment, the porous body 55 is disposed on one adjacent surface (adjacent surface on the side where the load does not act from the rolling element 53) adjacent to the rolling raceway surface 51a of the inner ring 51. Is provided. That is, when the porous body 35 is provided on the adjacent surface on the inner side in the axial direction on which the load due to the rolling element 33 is pressed, the bearing performance as designed may not be obtained. ing.

  The porous body 55 is formed in the same manner as the porous body 35 of the first embodiment. A lubricating oil supply port 55a formed in the same manner as in the first embodiment is provided on the surface of the exposed surface of the porous body 55 on the rolling raceway surface 51a side. That is, the lubricating oil supply port 55a is provided so as to make one round in the circumferential direction adjacent to the rolling raceway surface 51a. Further, on the surface portion of the exposed surface of the porous body 55 excluding the lubricating oil supply port 55a, a non-permeable layer 55b for preventing leakage of the lubricating oil is provided as in the case of the first embodiment. .

  The inner ring 51 is provided with two supply pipes 66, 66 that pass through in the radial direction and whose inner peripheral side opening communicates with the porous body 55 at positions that are axially symmetric. The supply pipes 66 and 66 are respectively connected to lubricating oil supply paths 2a and 2a provided on the spindle 2, and the lubricating oil is supplied from the lubricating oil supply paths 2a and 2a.

  In the rolling bearing device 5 of the present embodiment configured as described above, lubricating oil is supplied to the porous body 55 from the respective lubricating oil supply paths 2a and 2a via the respective supply pipelines 56 and 56, and the porous body 55 Lubricating oil stays in the pores. An appropriate amount of the lubricating oil held in the porous body 55 is reliably and stably supplied from each lubricating oil supply port 55a, 55a provided adjacent to the rolling track surface 51a. Supplied to the surface 51a.

  Therefore, also in the case of the rolling bearing device 5 of the present embodiment, since the inner ring 51 includes the porous body 55 and the supply pipes 56 and 56, the pores of the porous body 55 from the supply pipes 56 and 56. The lubricating oil supplied and held therein can be reliably and stably supplied to the rolling raceway surface 51a in an appropriate amount, and the same operations and effects as those of the first embodiment can be achieved. .

  In particular, in the present embodiment, since the porous body 55 and the supply pipes 56 and 56 are provided for the inner ring 51 attached to the spindle 2 on the rotation side in the spindle device, the spindle 2 rotates. The supply of the lubricating oil from the lubricating oil supply port 55a of the porous body 55 to the rolling raceway surface 51a can be made smoother by utilizing the centrifugal force generated at that time.

It is a fragmentary sectional view which shows the principal part of the main axis | shaft apparatus with which the rolling bearing apparatus which concerns on Embodiment 1 of this invention was applied. It is sectional drawing of the rolling bearing apparatus which concerns on Embodiment 1 of this invention. It is a fragmentary sectional view of the main axis | shaft apparatus with which the rolling bearing apparatus which concerns on Embodiment 2 of this invention was applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Spindle (rotating shaft) 3, 5 ... Rolling bearing device 31, 51 ... Inner ring 31a, 51a ... Rolling raceway surface 31b, 51b ... Adjacent surface 32, 52 ... Outer ring 32a, 52a ... Rolling raceway surface 32b , 52b ... adjacent surface 33, 53 ... rolling element 35, 55 ... porous body 35a, 55a ... lubricating oil supply port 35b, 55b ... non-permeable layer 36, 66 ... supply conduit

Claims (7)

In a rolling bearing device comprising an inner ring, an outer ring, and a plurality of rolling elements disposed between the inner ring and the outer ring, and rotatably supporting a rotating shaft with respect to a housing,
The inner ring or the outer ring includes a porous body provided on an adjacent surface adjacent to a rolling raceway surface of the rolling element, and a supply pipe for supplying lubricating oil to the porous body. A rolling bearing device that is characterized.   The rolling bearing device according to claim 1, wherein the porous body has a lubricating oil supply port formed by clogging in a part of the exposed surface.   The porous body includes the lubricating oil supply port provided in a surface portion of the exposed surface on the rolling raceway surface side, and the lubricating oil provided in a surface portion of the exposed surface excluding the lubricating oil supply port. The rolling bearing device according to claim 1, further comprising: a non-permeable layer that prevents the non-permeable layer.   The rolling bearing device according to claim 1, wherein the porous body is continuously provided in a circumferential direction.   The rolling bearing device according to any one of claims 1 to 4, wherein the porous body and the supply pipe line are provided on the outer ring mounted on the housing on the fixed side.   The rolling bearing device according to any one of claims 1 to 4, wherein the porous body and the supply pipe line are provided in the inner ring attached to the rotating shaft on the rotating side. .   A main shaft device, wherein the rolling bearing device according to any one of claims 1 to 6 is used.

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