JP2006102906A - Main spindle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main spindle device excellent in maintainability limiting a maintenance range only to a seal component even when internal leakage occurs due to wear or the like of the seal component for a cutting fluid. <P>SOLUTION: The main spindle device 1 is provided with a plurality of main spindle constituents mounted at the rear of a front housing of a main spindle and stored inside an outer cylinder. A main spindle assembly 48, in which each of the outer diameters of the main spindle constituents is successively formed to be smaller in the order starting from the front housing side, is composed so as to be insertable/extractable to/from the outer cylinder. Consequently, the main spindle device 1 has excellent maintainability. An annular slinger 40, which is formed of an elastic body as one of the main spindle constituents, is provided to the rear end part of the main spindle. An annular receiving plate 43, which has an L-shaped cross-section protruding rearward, is provided to the inner diameter part of the outer cylinder. The outer diameter of the slinger is set larger than the inner diameter of the receiving plate. The receiving plate is arranged in front of the slinger. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a spindle device provided in a machine tool such as a milling machine, a machining center, or a grinding machine.

  A conventional spindle device includes a spindle that is rotatably supported by a front spindle bearing on a front housing that is detachably attached to an outer cylinder fixed to a support base, and a drive motor that is attached to the rear of the spindle front housing. The main shaft assembly is assembled by assembling the main shaft components such as the rotor, the overhang flange, and the overhang portion of the bearing sleeve, and the outer diameters of the main shaft components of the main shaft assembly are sequentially increased from the front housing side. It is made small so that it can be inserted into and removed from the outer cylinder, and the workpiece is processed by supplying cutting fluid to the tool from the rear side through a communication hole provided along the axis of the main shaft (for example, , See Patent Document 1).

In addition, in Japanese Patent Application No. 2003-419854, the applicant has proposed a spindle device that improves the maintainability by ensuring the insertability of the spindle assembly and adding a rear main bearing to the spindle component of the spindle assembly. .
JP-A-7-112303 (2nd page paragraph 0009-4th page paragraph 0033, FIGS. 3 and 4)

  However, in the above-described conventional technology, the outer diameter of the main shaft component of the main shaft assembly is reduced in order from the front housing side and stored in the outer cylinder, so that the rotating main shaft and the stationary outer shaft are stored. When seal parts such as packing that seals the leakage of the cutting fluid supplied to the communication holes provided between the cylinders into the main spindle unit are worn or damaged, internal leakage occurs and the leaked cutting Liquid easily reaches the front main bearing, rear main bearing, and drive motor stator arranged in front of the seal mechanism.If the liquid enters the front main bearing or rear main bearing, the lubricant is washed away, causing damage to the stator. If it adheres, there is a problem that there is a concern of causing a dielectric breakdown of the coil and causing leakage.

This front main bearing, rear main bearing, and drive motor are important parts that make it difficult to continue normal rotation of the spindle device if any one of them fails. The maintenance range of the spindle device must be avoided as a whole, and the development of a technology for limiting the maintenance range in such a case to only seal parts is expected.
The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide means for stopping the maintenance range only on the seal parts even when internal leakage occurs due to wear of the seal parts of the cutting fluid. And

  In order to solve the above-described problems, the present invention provides an outer cylinder, a front housing that is detachably attached to the outer cylinder, a front main bearing that is fitted to the front housing, and a front main bearing that is rotatable. A main shaft to be supported, and a plurality of main shaft components that are attached to the rear side of the front housing of the main shaft and housed inside the outer cylinder, and the outer diameters of the main shaft components are sequentially arranged from the front housing side. A main shaft assembly formed to be small and configured so that a main shaft assembly in which the front housing, the front main bearing, the main shaft, and the main shaft components are integrated with each other can be inserted into and removed from the outer cylinder. An annular slinger is provided as one of the components, an annular saucer is provided on the inner diameter portion of the outer cylinder, the outer diameter of the slinger is set larger than the inner diameter of the saucer, and the Characterized in that the dishes were placed in front of the slinger.

  Further, the slinger is formed of an elastic body.

As a result, even when internal leakage of cutting fluid or the like occurs from the seal component, the present invention provides cutting fluid to the front main bearing, rear main bearing, drive motor, etc. by a slinger having an outer diameter larger than the inner diameter of the tray. Intrusion can be prevented, and an effect that a highly reliable spindle device can be obtained is obtained.
Further, since the slinger is formed of an elastic body, the spindle assembly can be inserted into and removed from the outer cylinder, and an effect that a spindle apparatus with good maintainability can be obtained.

  Embodiments of a spindle apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing the main shaft device of the first embodiment, FIG. 2 is a cross-sectional view showing the main shaft assembly of the first embodiment, and FIG. 3 is an enlarged view showing a rear portion of the main shaft device of the first embodiment.
In FIG. 1, reference numeral 1 denotes a spindle device.
Reference numeral 2 denotes an outer cylinder, which is a cylindrical member made of a steel material such as alloy steel, and is fixed to a spindle head (not shown) by a bolt or the like by a fixing flange 2a provided on the outer peripheral surface.

A stator 4a having a plurality of coils of a drive motor 4 such as an induction motor is installed on the inner peripheral surface 3 of the outer cylinder 2 by press fitting or the like.
Reference numeral 5 denotes a front housing, which is a cylindrical member made of a steel material such as alloy steel, and is detachably assembled to the outer cylinder 2 with a bolt or the like using a mounting flange 5a provided on the outer peripheral surface. A fitting projection 5b provided on the inner diameter side of the rear side of the mounting flange 5a (the direction indicated by the arrow P in FIG. 1 and the opposite direction of the arrow P is referred to as the front side) is the inner peripheral surface of the outer cylinder 2 3 is secured to be coaxial with the outer cylinder 2.

Reference numeral 6 denotes a front main bearing, which is configured by applying a preload to a plurality of angular ball bearings with outer rings fitted to the inner peripheral surface of the front housing 5 by spacers 6 a and bearing retainers 7. In this embodiment, the front main bearing 6 is constituted by two angular ball bearings arranged in parallel facing the rear arrangement.
Reference numeral 8 denotes a main shaft, which is a rod-shaped member made of a steel material such as alloy steel, and the outer peripheral surface thereof is fitted to the inner ring of the front main bearing 6 and is rotatably supported.

The main shaft 8 has a communication hole 9a extending along the axial center of the main shaft 8, and supplies cutting fluid to the cutting edge of the tool 11 attached to the tool holder 10 mounted in front of the main shaft 8. To do.
A rotor 4b of the drive motor 4 as a main shaft component is fixed by press-fitting or the like at a position facing the stator 4a behind the mounting flange 5a of the front housing 5 of the main shaft 8 via a gap, and is connected to the stator 4a. The main shaft 8 is rotated in cooperation with the stator 4a by the electric power supplied from the power cable 12 to be operated.

  Reference numeral 13 denotes a rear main bearing as a main shaft component. The outer ring is fitted to the inner circumferential surface of a bearing sleeve 14 formed of a steel material such as alloy steel into a cylindrical shape, and the inner ring is fitted to the outer circumferential surface of the main shaft 8. A plurality of angular ball bearings are configured by applying a preload by a spacer 13a or a bearing retainer 15. In this embodiment, the rear main bearing 13 is configured by fitting the outer ring of two angular ball bearings arranged at the back to the bearing sleeve 14 and assembling the spacer 13 a and the bearing retainer 15.

The outer peripheral surface of the bearing sleeve 14 is fitted to the inner peripheral surface of the sleeve housing 16 attached to the rear of the outer cylinder 2 by a clearance fit, and is configured to be movable in the front-rear direction.
The main shaft 8 is rotatably supported with respect to the outer cylinder 2 by the front main bearing 6 and the rear main bearing 13, and the elongation due to thermal expansion of the main shaft 8 is absorbed by the fitting of the bearing sleeve 14 and the sleeve housing 16. Is done.

Reference numeral 18 denotes an encoder as a main shaft component, which is an annular member in which a large number of teeth are formed on the outer peripheral surface made of a metal material or the like, and the inner peripheral surface thereof is fixed to the annular encoder adapter 18a by press fitting or the like. Then, the inner peripheral surface of the encoder adapter 18 a is fitted to the outer peripheral surface of the main shaft 8 behind the rear main bearing 13.
Reference numeral 19 denotes a rotational position detection sensor, which is an optical sensor or the like disposed on the rear end face of the sleeve housing 16 so as to face the teeth on the outer peripheral surface of the encoder 18 with a gap, and detects the teeth of the encoder 18. And has a function of outputting as a rectangular wave or the like.

A bearing nut 21 as a main shaft component is screwed into a screw portion provided at the rear portion of the main shaft 8 and presses the inner ring of the angular ball bearing of the rear main bearing 13 via the encoder adapter 18a of the encoder 18. At the same time, the encoder 18 is fixed to the main shaft 8.
Reference numeral 22 denotes a piston mechanism, which is inserted into a cylinder 24 disposed behind a case 23 disposed behind the sleeve housing 16 as shown in FIG. 3 and an O-ring 25a and a seal body 25b. It is constituted by a piston 25 and a cover 26, and is configured to be able to reciprocate back and forth by introducing hydraulic pressure or air pressure into pressure chambers 27a and 27b formed before and after the piston 25, and is inserted from the rear portion of the main shaft 8. The tool holder 10 is put into an unclamped state by pressurizing the pressure chamber 27a and pressing the piston 25 with a dog 29 as a main shaft component formed in a bowl shape on a dog shaft 28 of an unclamp mechanism (not shown).

The dog shaft 28 is configured to rotate together with the main shaft 8 via a spline or the like while allowing movement in the axial direction, and a communication hole 9b drilled along the axis of the dog shaft 28 communicates with the main shaft 8. The hole 9a communicates with an O-ring (not shown).
Reference numeral 29a denotes a position detection sensor that detects the presence of a nearby component such as an electromagnetic type or a capacitance type, and detects the position of the dog 29 to detect the clamped or unclamped state of the tool holder 10. .

Reference numeral 30 denotes a rotary joint cartridge, which is made of a steel material such as alloy steel and is a bottomed cylindrical member having a stepped outer peripheral surface disposed behind the cover 26 of the piston mechanism 22. A bearing portion 31 installed on the cover 26 is disposed.
The bearing unit 31 is a bearing device in which two angular ball bearings are housed in a bearing box as a front arrangement, and rotatably supports a rotating shaft 32 fitted to an inner ring.

A cutting fluid supply hole 33 is provided in the rear portion of the rotary joint cartridge 30, and cutting fluid pressurized by a pipe or the like is supplied from a cutting fluid supply device (not shown).
Reference numeral 34 denotes a rotary seal device, and a stationary seal 34a provided on a rotary joint cartridge 30 as a stationary body is brought into sliding contact with a rotary seal 34b provided at a rear end portion of a rotary shaft 32 as a rotary body. It is a contact seal that seals the system and the rotating system, for example, a mechanical seal, and communicates with the cutting fluid supply hole 33 and the communication hole 9 c drilled along the axis of the rotating shaft 32.

Reference numeral 35 denotes a connecting portion that connects the rotating shaft 32 and the dog shaft 28 via a spline or the like so as to allow the shaft to move in the axial direction, and to connect the communicating hole 9c of the rotating shaft 32 and the dog shaft. It communicates with the hole 9b.
Reference numeral 37 denotes a packing, which is a contact seal formed of synthetic rubber or the like, and allows the relative movement of the dog shaft 28 of the rotary shaft 32 accompanying the reciprocation of the dog shaft 28 to allow cutting fluid overflowing from the connecting portion 35 to flow. Seal.

As described above, the communication holes 9a, 9b, and 9c communicate with each other to form the communication path 9 of this embodiment.
A purge air supply port 38 supplies pressurized air supplied from an air source (not shown) to the inside of the spindle device 1 through the air passage 38a.
Reference numeral 40 denotes a slinger as a main shaft component, which is a relatively thin annular member made of a relatively hard and oil-resistant elastic body such as nitrile rubber or fluorine rubber, and its outer peripheral side is inclined forward. An inclined edge 40a is formed so as to be bent, and is fixed to the bearing nut 21 by a bolt through an annular slinger presser 41 and is installed at the rear end portion of the main shaft 8.

The material forming the slinger 40 is not limited to the above, and may be a relatively hard vinyl or the like. In short, any material may be used as long as it is a relatively hard elastic body excellent in oil resistance.
An O-ring 42 is mounted between the inner peripheral surface of the slinger presser 41 and the outer peripheral surface of the main shaft 8, and seals leakage of cutting fluid or the like propagating along the outer peripheral surface of the main shaft 8 from the rear of the slinger 40.

Reference numeral 43 denotes a tray, which is an annular member having an L-shaped cross section from the case inner peripheral surface 23a of the case 23 toward the shaft core, and one of the L-shaped sides protrudes rearward at the inner diameter portion thereof. The receiving edge 44 is formed and is disposed immediately before the slinger 40.
In addition, the case 23 is provided with a discharge hole 45 that communicates the space formed by the receiving edge 44 and the case inner peripheral surface 23 a and the outside of the case 23. The tray 43 of this embodiment is formed integrally with the case inner peripheral surface 23 a of the case 23.

The front housing 5, the front main bearing 6, the main shaft 8, the dog shaft 28, and the rotor 4b, the rear main bearing 13, and the encoder 18 which are main shaft components mounted on the rear side of the fitting protrusion 5b of the front housing 5 of the main shaft 8. 2, the spindle nut 48 of the present embodiment shown in FIG. 2 is constituted by the bearing nut 21, slinger 40, dog 29 and the like.
Further, as shown in FIG. 2, the diameter of each of the above-mentioned parts is the same as the diameter of the outer peripheral surface 3 of the outer cylinder 2, and the outer diameter of the fitting projection 5 b of the front housing 5 is φA. The outer diameter of the rotor 4b is φB, the outer diameter of the bearing sleeve 14 of the rear main bearing 13 is φC, the outer diameter of the teeth of the encoder 18 is φD, the outer diameter of the bearing nut 21 is φE, and the outer diameter of the slinger 40 is The outer diameter of φF and the dog 29 is formed by φG, and the outer diameter of the main shaft component excluding the slinger 40 is φA>φB>φC> φD with respect to the outer diameter φA of the fitting protrusion 5 b of the front housing 5. It is formed so as to decrease in order toward the rear so that>φE> φG.

The outer diameter φF of the slinger 40 is formed to be larger than the inner diameter φH of the tray 43 and smaller than the diameter of the case inner peripheral surface 23a of the case 23 as shown in FIG.
A rotary assembly in which the outer cylinder 2 to which the stator 4a is assembled is assembled to the sleeve housing 16 to which the rotational position detection sensor 19 is assembled, the case 23 having the receiving tray 43, the piston mechanism 22, the rotary shaft 32 and the rotary seal device 34. The outer cartridge assembly of this embodiment is formed by assembling the joint cartridge and the like.

The operation of the above configuration will be described.
The spindle device 1 of the present embodiment is a stationary system such as the front housing 5 and the outer cylinder 2, the sleeve housing 16, the case 23, the cylinder 24, the cover 26, the rotary joint cartridge 30 and the like, and the fitting part and the joint part are O-rings and the like. Thus, the outlet of the power cable 12 is sealed with a boot seal or the like so that dust, cutting fluid, or the like does not enter from the outside.

  The rotary joint cartridge 30 is sealed between the stationary system and the rotary system by the rotary seal device 34, and the relative movement accompanying the reciprocating operation of the piston mechanism 22 is sealed by the O-ring 25a, the seal body 25b, and the packing 37. Therefore, the cutting fluid that is normally supplied from the working medium and the cutting fluid supply hole 33 when the piston mechanism 22 is hydraulic and does not leak into the main shaft device 1 does not leak into the main shaft device 1. When the seal body of the device 34, the O-ring 25a, the seal body 25b, and the packing 37 are worn beyond the limit due to sliding, or when an unexpected situation such as breakage or dropping of the rotary seal device 34 occurs, the working medium Or the cutting fluid leaks into the spindle device 1.

In the present embodiment, such a site that causes internal leakage is concentrated rearward, that is, rearward of the rear end portion of the main shaft 8, and the slinger 40 and the receiving tray 43 are provided at the rear end portion of the main shaft 8. Even when internal leakage occurs, cutting fluid or the like is prevented from entering important parts such as the rear main bearing 13, the drive motor 4, and the front main bearing 6.
That is, when internal leakage occurs during the rotation of the main shaft 8, cutting fluid or the like leaks to the upper part of the slinger 40 due to its own weight. And since the cutting fluid etc. which reached the slinger presser 41 of the slinger 40 rotating with the main shaft 8 are sealed between the slinger presser 41 and the main shaft 8 by an O-ring 42, the upper surface of the slinger presser 41 is subjected to centrifugal force. And the like, and reaches the inclined edge 40a of the slinger 40, part of which is swung away by the centrifugal force in the direction of the case inner peripheral surface 23a of the case 23, and the others are inclined forward on the outer peripheral side of the slinger 40. It moves along the edge 40a, and falls from there to a receiving tray 43 having an inner diameter smaller than the outer diameter of the slinger 40, and is collected in a space between the receiving edge 44 and the case inner peripheral surface 23a.

Further, the cutting fluid or the like sprinkled off the case inner peripheral surface 23a or the cutting fluid directly attached to the inner wall of the rotary joint cartridge 30 is transmitted along the respective wall surfaces by its own weight and protrudes inside the case inner peripheral surface 23a. It is received by the receiving tray 43 and collected in the space between the receiving edge 44 and the case inner peripheral surface 23a.
The cutting fluid collected in this way is discharged to the outside of the spindle device 1 through the discharge hole 45.

In this case, since the slinger 40 is rotating and the inclined edge 40a is inclined forward, the cutting fluid or the like is prevented from entering the main shaft 8 side along the lower surface of the slinger 40.
Moreover, since the receiving edge 44 which protruded toward the back is provided in the internal diameter part of the saucer 43, the fallen cutting fluid etc. are prevented from entering into the main shaft 8 side, and overflowing into the main shaft 8 side. Is prevented.

Furthermore, since the inside of the spindle device 1 is pressurized by the pressurized air supplied from the purge air supply port 38 through the air passage 38a, the cutting fluid and the like dropped to the receiving tray 43 are quickly discharged from the discharge hole 45. Intrusion of dust and moisture from the outside of the spindle device 1 is prevented.
When the main shaft is not rotating, the effect of the centrifugal force is eliminated, but the cutting fluid or the like collects in the space between the receiving edge 44 and the case inner peripheral surface 23a by its own weight and is discharged from the discharge hole 45 to the outside. Is done.

In this way, intrusion of cutting fluid or the like into an important part of the spindle device 1 in the case of internal leakage is prevented, and the maintenance range in the case of internal leakage is limited to the rotary seal device 34, the O-ring 25a, and the seal body. 25b, it can be stopped only on the seal part of the packing 37.
When disassembling the spindle assembly 48 and the outer cylinder assembly of this embodiment for maintenance or the like, the bolts of the mounting flange 5a that fasten the outer cylinder 2 and the front housing 5 are removed, and the front housing 5 and the spindle are removed. The main shaft assembly 48 is pulled out from the outer cylinder assembly by pulling 8 forward.

  At this time, when the spindle assembly 48 is pulled forward (in the direction opposite to the arrow P in FIG. 1 shown by a thick arrow in FIG. 4) from the state immediately after the bolt of the mounting flange 5a shown in FIG. 4 (b), the slinger 40, which is an elastic body and has an outer diameter larger than the inner diameter of the tray 43, contacts the rear of the receiving edge 44 of the tray 43 and is deformed rearward due to its elasticity. As shown in FIG. 4 (c), it passes through the inner diameter and is extracted in front of the tray 43. Thereafter, each main shaft component of the main shaft assembly 48 is formed so as to have a smaller diameter in order from the front housing 5 toward the rear, so that the main shaft assembly 48 can be smoothly removed from the outer cylinder assembly.

In this case, even if there is a portion where the outer diameter portion of the slinger 40 is larger than the inner diameter of each part constituting the outer cylinder assembly after the slinger 40 is pulled out in front of the tray 43, the slinger 40 is formed of an elastic body. Therefore, the slinger 40 can be deformed rearward and the spindle assembly 48 can be removed from the outer cylinder assembly in the same manner as described above.
When assembling the main shaft assembly 48 and the outer cylinder assembly of the present embodiment, the main shaft assembly 48 is moved backward from the dog shaft 28 side to the inside of the outer cylinder assembly (the arrow P in FIG. 1 indicated by a thick arrow in FIG. 5). In the same direction).

  At this time, each spindle component of the spindle assembly 48 is formed so as to have a smaller diameter in order from the front housing 5 toward the rear, so that the slinger 40 shown in FIG. The main shaft assembly 48 can be smoothly inserted into the outer cylinder assembly 48 until the main shaft assembly 48 is further inserted, and the elastic body is larger than the inner diameter of the tray 43 as shown in FIG. The slinger 40 formed with an outer diameter contacts the front of the receiving edge 44 of the receiving tray 43 and deforms forward by its elasticity, passes through the inner diameter of the receiving tray 43, and as shown in FIG. Inserted into. Thereafter, the main shaft components of the main shaft assembly 48 are formed so as to have a smaller diameter in order from the front housing 5 toward the rear, so that the main shaft assembly 48 can be smoothly inserted into the outer cylinder assembly.

Then, the bolt of the mounting flange 5a that fastens the outer cylinder 2 and the front housing 5 is tightened, and the main spindle assembly 48 is assembled to the outer cylinder assembly.
In this case, even if there is a portion where the outer diameter portion of the slinger 40 is larger than the inner diameter of each component constituting the outer cylinder assembly before the spindle assembly 48 is inserted and the slinger 40 is positioned immediately before the tray 43. Since the slinger 40 is formed of an elastic body, the slinger 40 can be deformed forward and the spindle assembly 48 can be inserted into the outer cylinder assembly in the same manner as described above.

  In this way, if the slinger 40 having an outer diameter larger than the inner diameter of the tray 43 is formed of an elastic body, it is possible to prevent cutting fluid and the like from entering an important part when internal leakage occurs and to form an outer cylinder assembly. Since the spindle assembly 48 can be easily inserted into and removed from a solid body, the maintenance range can be limited to seal parts, and the time required for maintenance can be shortened to improve the operating efficiency of the machine tool provided with the spindle device. Can be made.

In this embodiment, the outer cylinder 2, the sleeve housing 16, and the case 23 are set as separate parts from the viewpoint of assemblability and workability. However, as described above, the spindle assembly 48 of this embodiment is Since insertion / extraction from the front of the outer cylinder 2 is possible, these may be formed as one component integrated with the outer cylinder 2.
As described above, in this embodiment, a slinger is provided at the rear end portion of the main shaft, and a saucer provided at the inner diameter portion of the outer cylinder is disposed immediately before, and the outer diameter of the slinger is set larger than the inner diameter of the saucer. Even when internal leakage such as cutting fluid occurs from sealing parts such as rotary seal devices and packings, the cutting fluid is applied to the front main bearing, rear main bearing, drive motor, etc. by a slinger having an outer diameter larger than the inner diameter of the tray. And the like, and a highly reliable spindle device can be obtained.

In addition, since the slinger is formed of an elastic body, even if the outer diameter of the slinger is set larger than the inner diameter of the saucer, the main shaft assembly can be easily inserted into and removed from the outer cylinder assembly due to its elasticity. It can be set as the spindle apparatus excellent in property.
In the present embodiment, the tray is described as being disposed immediately before the slinger. However, the position of the tray is not limited to the above, and the front main bearing, the rear main bearing, and the rearmost main shaft among the drive motors in front of the slinger. If it arrange | positions to a structure, the effect similar to the above can be acquired.

FIG. 6 is an enlarged view showing a rear portion of the spindle device of the second embodiment.
In addition, the same part as the said Example 1 attaches | subjects the same code | symbol, and abbreviate | omits the description.
In FIG. 6, reference numeral 51 denotes a slinger, which is an annular member made of a steel plate such as an alloy steel or a metal plate such as an aluminum alloy so that the slinger 40 and the slinger presser 41 of the first embodiment are integrated. An inclined edge 51a is formed on the outer peripheral side, and is fixed to the bearing nut 21 by a bolt and installed at the rear end portion of the main shaft 8.

52 is a saucer, which is made of an elastic body similar to that of the slinger 40 of the first embodiment, and is an annular member having an L-shaped cross section similar to that of the first embodiment. A receiving edge 53 is formed. The receiving edge 53 is fixed to the inner surface of the rear end portion of the case 23 by a bolt via a tray presser 54 and is disposed immediately before the slinger 51.
The case 23 of the present embodiment is provided with a discharge hole 56 that communicates a space formed by the receiving edge 53 and the case inner peripheral surface 23a and a suction port 55 connected to a suction pump (not shown) outside the case 23. It has been.

The operation of the above configuration will be described.
If internal leakage occurs in this embodiment, the cutting fluid or the like leaks to the upper part of the slinger 51 by its own weight as in the first embodiment, and the cutting fluid or the like moves on the upper surface of the slinger 51 by centrifugal force or the like. Then, the slinger 51 reaches the slanted edge 51 a, part of the slinger 51 is swung away by the centrifugal force in the direction of the case inner peripheral surface 23 a, and the rest of the slinger 51 has an inner diameter smaller than the slinger 51. And collected in the space between the receiving edge 53 and the case inner peripheral surface 23a.

Further, the cutting fluid or the like adhering to the inner wall is transferred to each wall surface by its own weight and is received by the tray 52 protruding inside the case inner peripheral surface 23a, and is received in the space between the receiving edge 53 and the case inner peripheral surface 23a. Collected.
The cutting fluid collected in this manner is sucked and discharged from the spindle device 1 through the suction port 55 communicating with the discharge hole 56.

  When disassembling the spindle assembly 48 and the outer cylinder assembly of this embodiment for maintenance or the like, when the spindle assembly 48 is pulled out in the same procedure as in FIG. 4 of the first embodiment, an elastic body is used. When a substantially rigid slinger 51 formed with an outer diameter larger than the inner diameter of the saucer 52 abuts behind the formed saucer 52, the saucer 52 deforms forward due to its elasticity, and the slinger 51 becomes an inner diameter of the saucer 52. It passes through and is extracted in front of it. Other operations are the same as those in the first embodiment.

  When assembling the main shaft assembly 48 and the outer cylinder assembly of the present embodiment, when the main shaft assembly 48 is inserted in the same procedure as in FIG. 5 of the first embodiment, the front of the tray 52 formed of an elastic body. When the substantially rigid slinger 51 formed with an outer diameter larger than the inner diameter of the tray 52 comes into contact, the tray 52 is deformed rearward due to its elasticity, and the slinger 51 passes through the inner diameter of the tray 52 and is inserted behind it. Is done. Other operations are the same as those in the first embodiment.

As described above, even if the tray 52 having an inner diameter smaller than the outer diameter of the slinger 51 is formed of an elastic body, it is possible to prevent the cutting fluid or the like from entering the important part when internal leakage occurs. The spindle assembly 48 can be easily inserted into and removed from the outer cylinder assembly.
As described above, in this embodiment, in addition to the same effects as those of the first embodiment, the outer diameter of the substantially rigid slinger is set larger than the inner diameter of the tray by forming the tray with an elastic body. Even so, the main shaft assembly can be easily inserted into and removed from the outer cylinder assembly due to its elasticity, and a main shaft device having excellent maintainability can be obtained.

In addition, by forming the slinger as a substantially rigid body with a metal plate or the like, it becomes possible to suppress the expansion of the slinger due to centrifugal force, and the gap with the inner peripheral surface of the case can be set small. It is possible to effectively prevent the cutting fluid or the like from entering the inside of the steel.
Furthermore, by cutting out the cutting fluid collected in the tray by suction, it is possible to more effectively prevent the cutting fluid and the like from entering the spindle device.

In the above description, it has been described that either the slinger or the saucer is formed of an elastic body. However, the same effect can be obtained even if both the slinger and the saucer are formed of an elastic body.
Further, in each of the above embodiments, the case where the present invention is applied to a built-in motor type spindle device has been described as an example. However, the spindle device to which the present invention is applied is not limited to the above, and an air motor type, an external drive type, etc. The same effect can be obtained even when applied to the spindle device.

Sectional drawing which shows the spindle apparatus of Example 1. Sectional drawing which shows the spindle assembly of Example 1. The enlarged view which shows the rear part of the spindle apparatus of Example 1. FIG. Explanatory drawing which shows the extraction procedure of the spindle assembly of Example 1. Explanatory drawing which shows the insertion procedure of the spindle assembly of Example 1. FIG. The enlarged view which shows the rear part of the spindle apparatus of Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main shaft apparatus 2 Outer cylinder 2a Fixed flange 3 Outer cylinder inner peripheral surface 4 Drive motor 4a Stator 4b Rotor 5 Front housing 5a Mounting flange 5b Fitting protrusion 6 Front main bearing 6a, 13a Spacer 7, 15 Bearing retainer 8 Main shaft 9 Stationary Passage 9a, 9b, 9c Communication hole 10 Tool holder 11 Tool 12 Power cable 13 Rear main bearing 14 Bearing sleeve 16 Sleeve housing 18 Encoder 18a Encoder adapter 19 Rotation position detection sensor 21 Bearing nut 22 Piston mechanism 23 Case 23a Case inner peripheral surface 24 Cylinder 25 Piston 25a, 42 O-ring 25b Seal body 26 Cover 27a, 27b Pressure chamber 28 Dog shaft 29 Dog 29a Position detection sensor 30 Rotary joint cartridge 31 Bearing portion 32 Rotating shaft 33 Cutting Supply hole 34 Rotating seal device 34a Fixed side seal 34b Rotational side seal 35 Connecting part 37 Packing 38 Purge air supply port 38a Air passage 40, 51 Slinger 40a, 51a Inclined edge 41 Slinger presser 43, 52 Receptacle 44, 53 Receptacle 44, 53 Discharge hole 48 Spindle assembly 54 Dish holder presser 55 Suction port

Claims (6)

An outer cylinder, a front housing detachably assembled to the outer cylinder, a front main bearing fitted to the front housing, a main shaft rotatably supported by the front main bearing, and the front housing of the main shaft A plurality of main spindle components that are attached to the rear of the main cylinder and housed inside the outer cylinder, and the outer diameter of the main spindle components is formed in order from the front housing side, the front housing and the front main bearing, In the spindle device configured to be able to insert and remove the spindle assembly in which the spindle and the spindle component are integrated, with respect to the outer cylinder,
An annular slinger is provided as one of the main shaft components at the rear end of the main shaft, an annular saucer is provided at the inner diameter portion of the outer cylinder, and the outer diameter of the slinger is set larger than the inner diameter of the saucer. In addition, the spindle device is characterized in that the tray is arranged in front of the slinger. In claim 1,
A main spindle device characterized in that the slinger is formed of an elastic body. In claim 1 or claim 2,
A spindle apparatus, wherein the tray is formed of an elastic body. An outer cylinder, a front housing detachably assembled to the outer cylinder, a front main bearing fitted to the front housing, a main shaft rotatably supported by the front main bearing, and the front housing of the main shaft A plurality of main spindle components that are attached to the rear of the main cylinder and housed inside the outer cylinder, and the outer diameter of the main spindle components is formed in order from the front housing side, the front housing and the front main bearing, In the spindle device configured to be able to insert and remove the spindle assembly in which the spindle and the spindle component are integrated, with respect to the outer cylinder,
An annular slinger made of an elastic body is provided as one of the main shaft components at the rear end of the main shaft, an annular saucer is provided on the inner diameter portion of the outer cylinder, and the outer diameter of the slinger is set on the saucer. A spindle device characterized by being set larger than an inner diameter and arranging the tray in front of the slinger. In claim 4,
A spindle apparatus, wherein the tray is formed of an elastic body. An outer cylinder, a front housing detachably assembled to the outer cylinder, a front main bearing fitted to the front housing, a main shaft rotatably supported by the front main bearing, and the front housing of the main shaft A plurality of main spindle components that are attached to the rear of the main cylinder and housed inside the outer cylinder, and the outer diameter of the main spindle components is formed in order from the front housing side, the front housing and the front main bearing, In the spindle device configured to be able to insert and remove the spindle assembly in which the spindle and the spindle component are integrated, with respect to the outer cylinder,
An annular slinger is provided as one of the main shaft components at the rear end of the main shaft, an annular receiving tray made of an elastic body is provided at the inner diameter portion of the outer cylinder, and the outer diameter of the slinger is set on the receiving tray. A spindle device characterized by being set larger than an inner diameter and arranging the tray in front of the slinger.