JP2013092238A - Lubricating oil supply device of machine tool spindle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a conventional oil feeding device, for which an oil tank, a pump and the like are installed in a place separated from a bearing being a lubrication object and a spindle including the bearing, thus requiring pipe routing inconveniently, and an external power source is used for driving the pump, which is thus problematic in terms of energy-saving.SOLUTION: This lubricating oil supply device of a machine tool spindle supplies lubricating oil to a rolling bearing 14 for supporting a rotary shaft 13 via an oil feeding passage from a storage tank 55, the storage tank 55 of the lubricating oil being provided outside the spindle, and the storage tank 55 is installed in a higher position than the rolling bearing 14, and the lubricating oil is sent to the rolling bearing 14 by pressure due to its own weight.

Description

  The present invention relates to an apparatus for supplying lubricating oil to a bearing of a machine tool spindle.

  As a lubricating oil supply device for machine tool spindles, an oil tank, a pump, etc. are installed at a position away from the spindle, a pipe is provided between the pump and the bearing, and the lubricating oil is supplied to the spindle bearing by driving the pump. A supply apparatus is conventionally known (Patent Document 1).

JP 2002-130593 A

  However, in the conventional lubricating oil supply device, since a lubricating device such as an oil tank or a pump is installed in a place away from the bearing to be lubricated and the spindle including the bearing, it is necessary to manage the piping. There was a problem that it took time to install the whole.

  In addition, since a pump is used for pumping the lubricating oil, energization from an external power source is required to drive the pump and the oil supply amount adjusting device, which has a problem in terms of energy saving. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lubricating oil supply device that does not require piping operation so that the piping for oil supply can be accommodated in the spindle without extending outside the spindle, and has an energy saving effect. .

  In order to solve the above-mentioned problem, a lubricating oil supply device for a machine tool spindle according to the present invention is provided with a rolling oil bearing tank provided with a lubricating oil storage tank outside the spindle and supporting a rotating shaft from the storage tank via an oil supply path. In the lubricating oil supply device for a machine tool spindle for supplying lubricating oil, the storage tank is installed at a position higher than the rolling bearing. With the above configuration, the lubricating oil in the storage tank is supplied to the rolling bearing by the pressure due to its own weight.

  Further, a fixed side spacer and a rotary side spacer are respectively provided adjacent to the end surfaces of the fixed side of the rolling bearing and the rotary side raceway close to the storage tank, and the fixed side spacer and the rotary side spacer are provided. An annular unit casing fixed to the fixed spacer is interposed between the unit casing, and the unit casing is divided into an inner tank on the rolling bearing side and a control chamber on the opposite side by a partition wall, and the inner tank is An oil supply unit is constituted by an oil supply system that communicates with the storage tank and is opened toward the inside of the rolling bearing at a position lower than the storage tank, and the nozzle provided in the internal tank extends from the storage tank to the nozzle, A control unit can be constituted by the control chamber and its internal members.

  Since the unit casing is interposed in the spacer portion, the apparatus can be made compact and space-saving.

  The power source necessary for the operation of the control unit and the valve is a generator composed of a multipolar magnet attached to the rotary spacer and a power generation coil provided in the control chamber so as to face the multipolar magnet. Trying to get through. For this reason, it is not necessary to supply power from the outside.

(1) Since the oil is supplied at a pressure due to the weight of the lubricating oil, no pressurizing means such as a pump for increasing the internal pressure of the storage tank is required, and energy saving can be achieved.

(2) Since a storage tank for lubricating oil can be installed in the column of the apparatus, the oil supply path is shortened and piping is not required.

(3) Since the power source for opening the nozzle uses power generated with the rotation of the rotation side spacer (inner ring side spacer of the embodiment), it is not necessary to use an external power source. . Further, since the nozzle is always closed by the urging force of the spring and the electromagnet is energized only when refueling is necessary, energy saving can be achieved also from these points.

(4) A unit casing is interposed between the rotating side spacer (inner ring spacer of the embodiment) and the fixed side spacer (same outer ring spacer), and the inside of the unit casing is separated into an internal tank and a control chamber. Therefore, the valve body portions of the control unit and the oil supply unit can be incorporated in the adjacent state, and the apparatus can be made compact.

FIG. 1 is a sectional view of a lubricating oil supply device for a machine tool spindle according to the first embodiment. FIG. 2 is a partially enlarged cross-sectional view of FIG. FIG. 3 is a partially enlarged cross-sectional view of FIG. 4 is a partially enlarged cross-sectional view of FIG. FIG. 5 is a partially enlarged sectional view of FIG. 6 is a partially enlarged cross-sectional view of FIG. FIG. 7 is a block diagram of the control unit.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
[Embodiment 1]

  First, an outline of the machine tool spindle shown in FIGS. 1 and 2 will be described. This spindle is used in machine tools such as a machining center, a grinding machine, and a lathe. In the illustrated case, a vertical type is shown, but the present invention can also be applied to a horizontal type.

  A housing 12 is fixed to a cast column 11 fixed to the machine body, and a rotating shaft 13 is disposed at the center of the housing 12. The upper housing member 12a is fitted into a stepped portion 12c (see FIG. 4) at the upper end of the lower housing member 12b, and the housing 12 is united and integrated by an adhesive stored in a circumferential groove 37 provided in the stepped portion 12c.

  The bearing that supports the rotating shaft 13 includes a rolling bearing 14 on the load side (hereinafter referred to as a lower part) and a rolling bearing 15 on the side opposite to the load (hereinafter referred to as an upper part). Four lower rolling bearings 14 are used and arranged in four stages in the axial direction. There is one lower rolling bearing 15. Angular ball bearings are used as these rolling bearings 14 and 15.

  A motor 16 for driving the rotary shaft 13 is provided between the lower and upper rolling bearings 14 and 15. The motor 16 includes a motor rotor 16a attached to the rotary shaft 13 and a motor stator 16b attached to the housing 12 side. The motor 16 for driving the spindle is not only provided inside the spindle as described above, but also a type for directly driving the rotary shaft 13 and a type installed outside the spindle and driven by belt transmission or the like.

  The angular ball bearing constituting the lower rolling bearing 14 is one in which a rolling element 19 is interposed between an inner ring (rotating side raceway ring) 17 and an outer ring (fixed side raceway ring) 18 (see FIGS. 2 and 3). ), The rolling elements 19 are held at regular intervals by the holder 21. The lower two-stage rolling bearings 14 are arranged in a posture with the front side of each angular ball bearing facing upward. On the other hand, the upper two tiers are arranged with the front side facing downward.

  An inner ring spacer (rotation side spacer) 22 is interposed adjacent to the upper stage of each inner ring 17, and similarly, an outer ring spacer (fixed side spacer) 23 is interposed adjacent to the upper stage of each outer ring 18. The seal member 25 (see FIG. 3) of each rolling bearing 14 is mounted on the lower shoulder of each rolling bearing 14 so as not to interfere with the later-described insertion of a nozzle 78 downward from the top.

  The lower four-stage rolling bearing 14 is interposed between the rotary shaft 13 and the lower distribution cylinder 24. The lower distribution cylinder 24 is fixed to the inner diameter surface of the lower housing member 12b so as to be coaxial with the rotary shaft 13, and a distribution path 66 described later is provided in the wall thickness thereof. A cooling water passage 39 is provided between the outer diameter surface of the lower distribution cylinder 24 and the inner diameter surface of the lower housing member 12 b so as to cool the rolling bearing 14 via the lower distribution cylinder 24. However, the piping path of the cooling water is not shown.

  An inner ring fixed spacer 28 is interposed between the inner ring spacer 22 arranged at the uppermost stage and the stepped portion 27 of the enlarged diameter portion 26 of the rotating shaft 13 (see FIGS. 1 and 2). Further, the inner ring positioning spacer 29 is pressed against the lower end surface of the inner ring 17 of the rolling bearing 14 arranged at the lowest stage in the axial direction. The inner ring positioning spacer 29 is positioned in the axial direction by an inner ring fixing nut 31 screwed to the lower end portion of the rotary shaft 13.

  Further, an outer ring pressing member 32 (see FIGS. 1 and 2) fitted to the enlarged diameter portion 26 of the rotating shaft 13 with a minute rotation gap with respect to the outer ring spacer 23 arranged at the uppermost stage. Pressed in the axial direction. The flange portion 33 of the outer ring pressing member 32 is fixed to the upper end surface of the lower distribution cylinder 24. The lower lid ring 34 of the housing 12 is pressed in the axial direction against the outer ring 18 of the rolling bearing 14 arranged at the lowermost stage.

  The lower lid ring 34 is fitted to the outer diameter surfaces of the inner ring positioning spacer 29 and the inner ring fixing nut 31 with a minute rotation gap. The lower lid ring 34 is fixed to the lower housing member 12 b with the flange portion 35 of the lower distribution cylinder 24 sandwiched between the lower end surface of the housing 12.

  As shown in FIG. 4, shallow circumferential grooves 36, 37, and 38 are provided on the outer diameter surfaces of the upper casing member 12 a, the lower casing member 12 b, and the lower distribution cylinder 24, respectively. The column 11 and the upper casing member 12a, the upper casing member 12a and the lower casing member 12b, and the lower casing member 12b and the lower distribution cylinder 24 are bonded together by the adhesive accumulated in the circumferential grooves 36, 37, and 38. It is integrated.

  The above-mentioned upper rolling bearing 15 is interposed between the rotating shaft 13 and the upper distribution cylinder 41 with the front side of the angular ball bearing facing upward, as shown in FIGS. The upper distribution cylinder 41 is fixed to the inner diameter surface of the upper lid ring 42 fixed to the upper end surface of the housing 12.

  Also in this case, a cooling water passage 43 (see FIG. 5) provided between the outer diameter surface of the upper distribution cylinder 41 and the inner diameter surface of the upper lid ring 42 is provided to cool the rolling bearing 15 via the upper distribution cylinder 41. Like to do. However, the piping path of the cooling water is not shown. The upper distribution cylinder 41 is provided with an inward flange portion 44 at the lower end thereof, and a minute rotation gap is provided between the inner diameter surface of the flange portion 44 and the rotary shaft 13.

  Further, the seal member 30 of the rolling bearing 15 is attached to the shoulder portion of the lower portion (rear side) so as not to obstruct the insertion of the nozzle 78 from the upper portion.

  An inner ring fixing spacer 47 is interposed between the lower end surface of the inner ring 45 of the rolling bearing 15 and the stepped portion 46 of the rotating shaft 13, and an inner ring spacer 49 is interposed between the upper end surface of the inner ring 45 and the inner ring fixing nut 48. Intervened. The inner ring fixing nut 48 is fixed to the outer periphery of the upper end portion of the rotating shaft 13 by screw connection.

  An outer ring fixing spacer 52 is interposed between the lower end surface of the outer ring 51 of the rolling bearing 15 and the flange portion 44 of the upper distribution cylinder 41, and an outer ring spacer 54 is interposed between the upper end surface of the outer ring 51 and the outer ring holding ring 53. Is interposed. The outer ring holding ring 53 is fixed to the end surface of the upper distribution cylinder 41 with a clearance in the radial direction and the axial direction with respect to the inner ring fixing nut 48.

  Next, an oil supply device for each of the rolling bearings 14 and 15 will be described. The oil supply devices for the lower rolling bearing 14 and the upper rolling bearing 15 are independent. Each oil supply device is constituted by an oil supply unit 40 (see FIGS. 1, 2, and 3) that integrates an oil supply system, and a control unit 50 (see FIGS. 2, 3, and 6) that integrates a control system. .

  The oil supply unit 40 related to the lower rolling bearing 14 is constituted by a series of members from the storage tank 55 to the nozzle 78 through the lower distribution cylinder 24 and the internal tank 76 of the unit casing 72.

  As shown in FIG. 1, the metal or plastic storage tank 55 is mounted on the outer surface of the column 11 at a position higher than the uppermost rolling bearing 14. The storage tank 55 is provided with a lubricating oil replenishment port 56 on the upper surface. A filter 57 is attached to the replenishing port 56 and a lid 58 is applied. The lid 58 is provided with an air hole 58a so that the inside of the storage tank 55 is opened to the atmosphere.

  An outflow port 59 is provided on the bottom surface or the lower side of the storage tank 55, and the inner bottom surface is provided with a gradient toward the outflow port 59, so that no remaining lubricant flows out. A viewing window 60 made of an oil-resistant plastic plate is provided on the front or side surface of the storage tank 55. It is even better to provide a scale line.

  A flow rate adjusting valve 65 is attached to the outlet 59, and a hose 62 is connected to the flow rate adjusting valve 65 via an appropriate joint 61 such as a one-touch joint. The hose 62 is guided into a pipe path 63 provided obliquely in the column 11 and communicated with an oil hole 64 provided in the upper housing member 12a. The oil hole 64 communicates with the main path 67 of the distribution path 66 of the lower distribution cylinder 24 (see FIGS. 2 and 3).

  The distribution path 66 includes a main path 67 provided in the axial direction, and a branch path 68 branched from the main path 67 in the radial direction at a position corresponding to each outer ring spacer 23.

  A circumferential groove 69 is provided on the outer diameter surface of each outer ring spacer 23 at a position corresponding to the branch path 68 (see FIG. 2), and an internal path 70 leading to the circumferential groove 69 is provided in each outer ring spacer 23. Provided. The internal path 70 communicates with an internal tank 76 (see FIG. 3) described later provided between the outer ring spacer 23 and the inner ring spacer 22. The circumferential groove 69 has an advantage of rough alignment of the branch path 68 and the internal path 70 in the circumferential direction.

  Although the internal tank 76 will be described later, a nozzle 78 that is opened and closed by a valve body 79 is provided on the bottom surface thereof. In “Claims”, the oil supply system from the outlet 59 of the storage tank 55 to the nozzle 78 is collectively referred to as “oil supply path”.

  As shown in FIGS. 1 and 5, the oil supply unit 40 of the upper rolling bearing 15 has the same configuration as the oil supply unit 40 of the lower rolling bearing 14 described above. Only the description is given, and the description thereof is omitted. However, in this case, in order to install the storage tank 55 at a position higher than the rolling bearing 15, a pedestal 71 is provided on the upper end surface of the column 11, and the storage tank 55 is installed thereon. The hose 62 is directly connected to the distribution path 66 of the upper distribution cylinder 41.

  Next, the control unit 50 of the lower rolling bearing 14 will be described. The control unit 50 includes a control chamber 77 of a unit casing 72 interposed between the inner ring spacer 22 and the outer ring spacer 23 and various members provided therein (see FIGS. 3 and 5 to 7). ).

  As shown in FIG. 3, an annular unit casing 72 is interposed between each of the four stages of inner ring spacers 22 and outer ring spacers 23 that are in contact with the upper part in the axial direction of each rolling bearing 14. The unit casing 72 is bonded and fixed to the inner diameter surface of the outer ring spacer 23, and a required rotation gap is provided between the unit casing 72 and the inner ring spacer 22. The upper surface portion of the unit casing 72 is a lid member 74.

  The inside of the unit casing 72 is vertically divided by a partition wall 75 (see FIG. 3). The lower part is an internal tank 76 constituting a part of the fuel supply unit 40, and the upper part is a control chamber 77 constituting the control unit 50.

  The internal tank 70 communicates with the internal passage 70, and a nozzle 78 extending downward toward the inside of the corresponding rolling bearing 14 is provided on the lower surface of the internal tank 76, and the internal tank inside the nozzle 78 is provided. A valve body 79 is provided in 76 so as to be movable in the vertical direction. The internal tank 76, the nozzle 78, and the valve body 79 belong to the oil supply system and are components of the above-described oil supply unit 40.

  As described above, the upper two stages of the four-stage rolling bearings 14 face downward, that is, the back side faces upward, so it is difficult to insert the nozzle 78 from above into the back side as it is. . For this reason, the upper two-stage rolling bearing 14 has an enlarged stepped portion that reaches the raceway groove 80 on the shoulder of the inner surface of the outer ring 18 of the rolling bearing 14 in order to secure a space for inserting the nozzle 78 on the back side. 81 is provided. The tip of the nozzle 78 is inserted into a space formed on the inner diameter surface of the enlarged diameter step portion 81 and approaches the raceway groove 80 and the rolling element 19.

  Since the lower two-stage rolling bearing 14 has the front side facing upward, the nozzle 78 is inserted as it is toward the raceway groove 82 without any special processing, and the tip of the roller bearing 14 is inserted into the raceway groove 82 on the inner ring 17 side. It is approaching the rolling element 19.

  A guide pin 83 is provided at the lower end of the valve body 79, and the guide pin 83 is inserted into the nozzle 78 with a required gap as a guide for the valve body 79. The nozzle 78 is opened and closed by a valve body shoulder 84 between the valve body 79 and the guide pin 83. An O-ring (not shown) may be attached to the valve body shoulder 84 (see FIG. 6), and the nozzle 78 may be opened and closed by the O-ring.

  A magnetic piece 85 is buried in the upper end surface of the valve body 79, and the upper end of a coil spring 86 fitted around the magnetic piece 85 is pressed against the partition wall 75, whereby the nozzle 78 is always attached in the closing direction by the valve body 79. It is fast.

  In the control chamber 77 constituting the control unit 50, an electromagnet 87 is attached to a part of the partition wall 75 facing the valve body 79. When the electromagnet 87 is excited, the valve body 79 is biased by the coil spring 86. The drawing nozzle 78 is opened opposite to the nozzle.

  In the generator 88 serving as an excitation power source for the electromagnet 87, a ring-shaped multipolar magnet 89 serving as a rotor is embedded in the outer diameter surface of the inner ring spacer 22 facing the control chamber 77. Inside the control chamber 77, a power generation coil 90 serving as a stator is provided at one or a plurality of locations in the circumferential direction so as to face the multipolar magnet 89. The power generation coil 90 is wound around an iron core, and AC power is generated at both ends of the power generation coil 90 as the multipolar magnet 89 rotates.

  The multipolar magnet 89 is formed by mixing magnetic powders such as ferrite and rare earths with NBR (nitrile rubber) or the like as a binder, vulcanizing and molding the magnet, and outer diameter surface of the inner ring spacer 22. And fixed to the circumferential groove 22a. In addition to the bonding method, a magnetic powder such as ferrite or rare earth mixed with NBR as a binder is attached to the circumferential groove 22a, and the rubber magnetic material is vulcanized and bonded to the circumferential groove 22a. There is also a method of applying magnetization.

  There is also a method in which a segment of a plastic magnet or sintered magnet using PPS (polyphenylene sulfide resin) or the like as a binder is bonded to the circumferential groove 22a.

  A control unit 91 is provided inside the control chamber 77. The control unit 91 includes an AC / DC converter 92 (see FIG. 7) that converts the alternating current into direct current, a capacitor 93 such as an electric double layer capacitor that stores the converted direct current power, a CPU 94, and various detection means. As detection means, there are a charge amount detection sensor 95 for the capacitor 93, a temperature sensor 96 for detecting the temperature of the rolling bearing 14, and a speed sensor 97 for detecting the rotational speed of the rolling bearing 14. In addition, there are a charging time measuring timer for the capacitor 93, a torque sensor for detecting the magnitude of the load acting on the rotating shaft 13, and the like.

  The CPU 94 appropriately controls the electromagnet 87 based on the signals obtained from these detection means to open and close the nozzle 78 and discharge the lubricating oil to the rolling bearing 14.

  The configuration of the unit casing 72 on the side of the rolling bearing 15, the internal tank 76, the control chamber 77, and the configuration of the control unit 50 (see FIG. 5) including the control chamber 77 are the same as those of the rolling bearing 14 described above. Therefore, only the same reference numerals are shown in FIG.

  The lubricating oil supply device for a machine tool spindle according to the first embodiment is as described above. Next, the operation thereof will be described.

  In each storage tank 55 corresponding to the lower rolling bearing 14 and the upper rolling bearing 15, atmospheric pressure acts on the oil surface by an air hole 58 a provided in a part of the lid 58. The amount of lubricating oil adjusted by the flow rate adjusting valve 65 is discharged from each nozzle 78 into the rolling bearings 14 and 15 by the pressure based on the atmospheric pressure, the height of the oil surface and the specific gravity of the lubricating oil, that is, the pressure by its own weight. Is done.

  When each of the rolling bearings 14 and 15 rotates with the rotation of the rotating shaft 13, AC power is induced in the power generation coil 90 by the rotation of the multipolar magnet 89 provided in the inner ring spacer 22. The AC power is converted into DC by the AC / DC converter 92 and stored in the capacitor 93. The generator 88, the AC / DC converter 92, and the capacitor 93 configured by the multipolar magnet 89 and the power generation coil 90 are collectively referred to as a power supply unit.

  The nozzle 78 is opened and closed by the CPU 94 controlling energization from the power supply unit to the electromagnet 87 based on detection signals of various sensors such as the charge amount detection sensor 95. With this control, the valve element 79 is retracted and opened only when refueling is necessary, and the nozzle 78 is opened to refuel the rolling bearings 14 and 15.

11 Column 12 Housing 12a Upper housing member 12b Lower housing member 12c Step portion 13 Rotating shaft 14 Rolling bearing 15 Rolling bearing 16 Motor 16a Motor rotor 16b Motor stator 17 Inner ring 18 Outer ring 19 Rolling element 21 Cage 22 Inner ring spacer 22a Circumferential groove 23 Outer ring spacer 24 Lower distribution cylinder 25 Seal member 26 Expanded portion 27 Stepped portion 28 Inner ring fixed spacer 29 Inner ring positioning spacer 30 Seal member 31 Inner ring fixing nut 32 Outer ring pressing member 33 Hook 34 Lower cover ring 35 Hook 36 38 Circumferential groove 39 Cooling water passage 40 Oil supply unit 41 Upper distribution cylinder 42 Upper lid ring 43 Cooling water passage 44 Collar portion 45 Inner ring 46 Stepped portion 47 Inner ring fixing spacer 48 Inner ring fixing nut 49 Inner ring spacer 50 Control unit 51 Outer ring 52 Outer ring Fixed spacer 53 Outer ring retainer phosphorus 54 Outer ring spacer 55 Storage tank 56 Replenishment port 57 Filter 58 Lid 58a Air hole 59 Outlet port 60 Peep window 61 Joint 62 Hose 63 Piping path 64 Oil hole 65 Flow rate adjusting valve 66 Distribution path 67 Main path 68 Branch path 69 Circumference Groove 70 Internal path 71 Mounting base 72 Unit casing 74 Lid member 75 Bulkhead 76 Internal tank 77 Control chamber 78 Nozzle 79 Valve body 80 Track groove 81 Diameter expansion step portion 82 Track groove 83 Guide pin 84 Valve body shoulder portion 85 Magnetic piece 86 Coil spring 87 Electromagnet 88 Generator 89 Multipolar magnet 90 Power generation coil 91 Control unit 92 AC / DC converter 93 Capacitor 94 CPU
95 Charge detection sensor 96 Temperature sensor 97 Speed sensor

Claims (13)

  In a lubricating oil supply device for a machine tool spindle, comprising a lubricating oil storage tank provided outside the spindle, and having an oil supply unit for supplying the lubricating oil from the storage tank to a rolling bearing that supports a rotating shaft through an oil supply path. Is installed at a position higher than the rolling bearing.   The storage tank is attached to a column of a machine tool, and a lubricant outlet provided on a bottom surface or a lower side of the storage tank is connected to the rolling bearing by an oil supply path. Lubricating oil supply device for machine tool spindle as described.   The storage tank has a lubricating oil replenishing port on its upper surface, a filter is mounted inside the replenishing port, a lid is detachably fitted inside the replenishing port outside the filter, and air is placed in the lid. 3. The machine tool spindle lubricating oil supply device according to claim 2, wherein a hole is provided.   4. The lubricating oil supply device for a machine tool spindle according to claim 2, wherein an outlet for lubricating oil is provided at a bottom surface or a lower side of the storage tank, and a flow rate adjusting valve is provided at the outlet. .   The spindle is a vertical type, the rolling bearings supporting the rotating shaft are arranged separately in a lower part and an upper part, and the oil supply unit is provided independently for the lower rolling bearing and the upper rolling bearing, respectively. Lubricating oil supply device for machine tool spindles.   The storage tank of the oil supply unit corresponding to the lower rolling bearing was attached to the side surface of the column, and the storage tank of the oil supply unit corresponding to the upper rolling bearing was mounted on a base installed on the upper surface of the column. The lubricating oil supply device for a machine tool spindle according to claim 5.   A fixed side spacer and a rotary side spacer are provided adjacent to the fixed bearing of the rolling bearing and the end surface of the rotating side race ring close to the storage tank, respectively, and between the fixed side spacer and the rotary side spacer. An annular unit casing fixed to the fixed spacer is interposed, and the unit casing is divided into an inner tank on the rolling bearing side and a control chamber on the opposite side by a partition, and the inner tank is the storage tank. And a nozzle provided in the internal tank is opened toward the inside of the rolling bearing at a position lower than the storage tank, and an oil supply unit is configured by an oil supply system from the storage tank to the nozzle, and the control chamber A lubricating oil supply for a machine tool spindle according to any one of claims 1 to 6, characterized in that a control unit is constituted by the inner member and the inner member thereof. Location.   A distribution cylinder is provided between the spindle housing and the fixed side spacer, a branch path communicating with the storage tank is provided in the distribution cylinder corresponding to the fixed side spacer, and an outer diameter of the fixed side spacer The lubricating oil supply for a machine tool spindle according to claim 7, wherein a circumferential groove communicating with the branching path is provided on a surface, and an internal path communicating with the circumferential groove is provided in the fixed side spacer. apparatus.   9. The lubrication of a machine tool spindle according to claim 7 or 8, wherein the on-off valve of the nozzle is provided in the inner tank so as to be movable in the axial direction and constantly biased in the direction of closing the nozzle. Oil supply device. The on-off valve control means is provided in the control chamber, and the control means comprises an electromagnet for attracting and opening the on-off valve against its urging force, and a power source part and a control part. The lubricating oil supply device for a machine tool spindle according to claim 9.   The power supply unit converts a multi-pole magnet attached to the rotating side spacer, a power generation coil provided in the control chamber so as to face the multi-pole magnet, and AC power obtained from the power generation coil into DC power. And a capacitor for accumulating the DC power, and a generator is configured by attaching a multipolar magnet to a rotating spacer facing the generating coil with a rotating gap therebetween. Item 15. A lubricating oil supply device for a machine tool spindle according to Item 10.   12. The machine tool spindle lubricating oil supply apparatus according to claim 10, wherein the control unit includes a CPU, and the CPU controls energization of the electric power stored in the capacitor to the electromagnet. A machine tool spindle comprising the lubricating oil supply device according to any one of claims 1 to 12.

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