JPH0829476B2 - Oil supply device in tool holder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder for mounting a cutting tool on a spindle of a machine tool, and an oil supply device for supplying cutting oil from an oil passage on the machine tool side to a rotary cutting tool with an oil hole. The present invention relates to a tool holder equipped with.

[0002]

2. Description of the Related Art A rotary cutting tool with an oil hole cools and lubricates the cutting edge portion by pouring the cutting oil supplied to the oil hole from the cutting edge portion to perform cutting.
It is characterized by extending the useful life of the cutting tool and improving the finished surface.

A conventional oil supply device for a tool holder of this type has a non-rotating support member 3 for rotatably supporting a rotary shaft 1 as shown in FIG. A connection tool is integrally provided, and oil is passed through the oil path connection tool and each oil supply path 6 of the non-rotational supporting member 3 to a tool supply path 7 provided on the rotating shaft, and the tool oil is supplied from the supply path 7. I try to refuel the hall.

At this time, since the oil supply passage is formed across the relative interface portion 8 between the non-rotating support member 3 in the non-rotating state and the rotating shaft 1 in the rotating state, it is possible to prevent oil leakage from between the interface portions. In order to do so, the oiltight ring 5 is interposed between the two.

However, during a long use period,
Alternatively, cutting powder or the like mixed in the cutting oil is caught between the oil-tight ring 5 and the outer peripheral surface of the rotary shaft 1 with which the oil-tight ring 5 is in rotary contact, as shown by a chain double-dashed line H in FIG. On the outer peripheral surface of the rotating shaft with which the oil-tight ring 5 comes into contact, a dent is generated by sliding frictional resistance of cutting powder or the like, the oil-tightness of the oil-tight ring is destroyed, and cutting oil (coolant) leaks from the dent, There have been many accidents in which the cutting oil enters the non-rotating support member shaft support bearing portions 2 and 2 provided with the oil supply passage sandwiched therebetween and damages the bearings 2 and 2.

In order to prevent this difficulty, the applicant of the present application has, in the past, shown in FIG. 9 a rotary shaft 1 and a pair of bearings 2, 2.
A replaceable sleeve 4 is interposed between both bearings 2 and 2 between a non-rotating support member 3 that rotatably supports the rotating shaft 1 via a non-rotating support member 3 and a sleeve 4.
The oil-tight ring 5 was interposed between and.

[0007]

With the structure shown in FIG. 9, the cutting dust or the like mixed from the outside or in the cutting oil is generated between the oil-tight ring 5 and the outer peripheral surface of the sleeve 4 with which the oil-tight ring 5 comes into rotational contact. When the oiltightness of the oiltight ring 5 is destroyed by the occurrence of depressions due to the sliding frictional resistance of cutting powder or the like on the outer peripheral surface of the sleeve 4 which is caught between them and comes into contact with the oiltight ring 5, There is an advantage that it is not necessary to replace the expensive rotary shaft 1 only by removing and replacing the rotary shaft 1 from the rotary shaft 1, and the repair cost is reduced accordingly.

However, in the above-mentioned prior art, the non-rotational supporting member 3 is supported by the bearings 2 and 2, and is integrally formed with the above-mentioned oil passage connector, so that the sleeve 4 is formed.
All of them had to be disassembled and replaced at the time of replacement, and they had to be installed in their original states at the time of mounting, and the replacement work was still very troublesome.

Therefore, according to the present invention, there is no hindrance to the refueling action at the time of use, that is, without disassembling the non-rotating support member or the oil passage connector, and even if the rotating shaft is slightly worn. The problem to be solved is to propose an oil supply device for a tool holder that does not hinder its use.

[0010]

In order to solve the above-mentioned problems, the present invention is attached to the spindle of a machine tool in the invention according to claim 1 by showing reference numerals of the embodiments. A tool holder provided with a rotating shaft 10 and a non-rotating supporting member 11 that rotatably supports the rotating shaft 10, for a tool provided on the rotating shaft 10 axially adjacent to the non-rotating supporting member 11. The non-rotating oil supply ring 13 communicating with the oil supply passage 12 is externally fitted to the rotating shaft 10,
A drain 22 is interposed between the non-rotating support member 11 and the non-rotating oil supply ring 13, and the non-rotating oil supply ring 13 and the oil passage connector 14 on the machine tool side are connected by an oil pipe 15 to connect the oil passage connector. 14 oil passage 16 and non-rotating oil supply ring 13 oil supply passage 1
7 is communicated with the oil passage 7 through the oil passage 18 of the oil passage pipe 15.

Further, in the invention according to claim 2, the drain includes the non-rotating support member 11 and the non-rotating oil supply ring 13.
The passage 50 is provided inside the rotary oil supply ring 13 and is located between and, and the structure according to claim 1 is adopted.

Further, in the invention according to claim 3, the drain includes the non-rotating support member 11 and the non-rotating oil supply ring 13.
Is provided as a separate body, and the gap 22 is interposed between the two.

In the invention according to claim 4, the drain comprises the non-rotating support member 11 and the non-rotating oil supply ring 13.
Is integrally provided, and the passage 22a interposed therebetween is adopted.

Further, in the invention according to claim 5, the non-rotating support member 11 and the non-rotating oil supply ring 13 are separately provided, and the non-rotating oil supply ring 13 and the oil passage connector 14 on the machine tool side are provided. The oil passage pipe 15a for connecting the above is detachably provided, and the configuration according to any one of claims 1 to 3 is adopted.

Further, in the invention according to claim 6, the non-rotating support member 11 and the non-rotating oil supply ring 13 are provided separately, and the non-rotating oil supply ring 13 and the oil passage connector 14 on the machine tool side are provided. An oil passage pipe 15a that connects the rotating shaft 10 is detachably provided, and a sleeve 19 that is integrally rotated with the rotating shaft 10 and is removable from the rotating shaft 10 is interposed between the non-rotating oil supply ring 13 and the rotating shaft 10. The configuration described in Item 1, 2, 3 or 5 is adopted.

In the invention according to claim 7, the oil-tight ring 2 is provided between the non-rotating oil supply ring 13 and the sleeve 19.
The configuration according to claim 6 in which 0 and 20 are interposed is adopted.

In the invention according to claim 8, the non-rotating oil supply ring 13 is provided with screw grooves 40 on both sides of the oil supply passage 17 provided on the inner peripheral surface of the non-rotating oil supply ring 13 with the oil supply passage 17 provided therebetween. The configuration according to any one of items 1 to 5 is adopted.

[0018]

According to the first aspect of the present invention, the rotary shaft 10 is attached to the spindle 48 of the machine tool, and the oil passage connector 14 integrated with the non-rotational supporting member 11 is provided on the machine tool-side oil supply table 2.
3, the rotary shaft 10 is rotatably supported by the non-rotating support member 11, and the non-rotating oil supply ring 13 is supported by or engaged with the non-rotating support member 11 or via the oil passage pipe 15. Is supported by the oil passage connector 14 in a non-rotating state, so that the oil passage 17 of the non-rotating oil supply ring 13 rotates with the oil passage 18 of the oil passage 15 and the oil passage 16 of the oil passage connector 14. Regardless of the rotation of the shaft 10, it is always in a communicating state. Therefore, when the oil passage connector 14 is connected to the oil supply table 23, the cutting oil (coolant) from the oil supply table 23 is transferred to the oil passage 16 of the oil passage connection device 14. , Oil passage 18 of oil passage 15 and oil passage 1 of non-rotating oil ring
7 and the tool T through the tool oil supply passage 12 of the rotary shaft 10.
The oil will be supplied to the oil hole h.

Non-rotating refueling ring 13 after long-term use
Is worn, for example, the non-rotating oil supply ring 13 is formed of a hard resin, and the inner peripheral surface of the non-rotating oil supply ring 13 in contact with the outer peripheral surface of the rotating shaft 10 is worn away, so that the oil tightness between the two is slightly lost. In this case, since the oil drain 22 is interposed between the non-rotating support member 11 and the non-rotating oil supply ring 13, the cutting oil leaked from between the non-rotating oil supply ring 13 and the rotary shaft 10 is prevented. Is discharged from the drain 22 to the outside before reaching the bearing portion 25 of the non-rotating support member 11.
Never invades 5.

Therefore, not only the non-rotating support member 11 supporting the rotating shaft 10 and the oil passage connector 14 integrally formed with the rotating shaft 10 do not need to be disassembled from the rotating shaft 10, but the non-rotating oil supply ring 13 is also almost replaced. You don't have to.

According to the second aspect of the present invention, the non-rotating oil supply ring 13 is worn due to long-term use and the rotating shaft 1
0 and the non-rotating refueling ring 13 are slightly lost in oil tightness, the non-rotating support member 11 and the non-rotating refueling ring 13
Since the drain passage 50 communicating with the outside is provided inside the non-rotating oil supply ring 13, the cutting oil leaked from between the non-rotating oil supply ring 13 and the rotating shaft 10 is not absorbed by the non-rotating support member 11. Drain passage 5 before reaching the bearing
It is discharged from 0 to the outside and does not enter the bearing portion 25. In this case, it is not necessary to provide a required gap between the non-rotational support member 11 and the non-rotational oil supply ring 13, and the non-rotational oil supply ring 13 as shown by the one-dot chain line in FIG.
May be in close contact with the non-rotation supporting member 11.

According to the third aspect of the present invention, the non-rotating oil supply ring 13 is worn due to long-term use and the rotating shaft 1
0 and the non-rotating oil supply ring 13 lose a little oil tightness, the drain gap 22 is interposed between the non-rotating support member 11 and the non-rotating oil supply ring 13, so that the non-rotating oil supply ring 13 does not rotate. The cutting oil leaking from between the oil supply ring 13 and the rotary shaft 10 is discharged to the outside from the drain gap 22 before reaching the bearing portion of the non-rotating support member 11, and does not enter the bearing portion 25. Since the non-rotational oil supply ring 13 is provided separately from the non-rotational support member 11, the material of the non-rotational oil supply ring 13 can be changed to the non-rotational support member 11 and can be freely selected. Material and rotating shaft 10
Can be formed of a foreign material such as gun metal.

Further, according to the invention of claim 4, the non-rotating oil supply ring 13 is worn due to long-term use and the rotating shaft 1
0 and the non-rotating oil supply ring 13 lose a little oil tightness, the drain passage 22a is interposed between the non-rotating support member 11 and the non-rotating oil supply ring 13 so that the non-rotating oil supply ring 13 does not rotate. The cutting oil leaking from between the oil supply ring 13 and the rotary shaft 10 is discharged to the outside from the drain passage 22a before reaching the bearing portion 25 of the non-rotating support member 11, and the bearing portion 25
Since the non-rotating oil supply ring 13 is integrally provided with the non-rotating support member 11, the non-rotating oil supply ring 13 is reliably supported by the non-rotating support member 11 and has a simple structure. is there.

According to the fifth aspect of the invention, the outer peripheral surface of the rotary shaft 10 and the non-rotating oil supply ring 1 are used for a long period of time.
The inner peripheral surface of the non-rotating oil supply ring 13 is abraded by cutting debris entering between the inner peripheral surface of the non-rotating oil supply ring 3 and the inner peripheral surface of the non-rotating oil supply ring 3, and the oil tightness between the two is lost, and the non-rotating oil supply ring 13 is When it is necessary to replace the non-rotating oil supply ring 13 with the detachable oil passage pipe 15a removed from the oil passage connector 14.
May be moved along the outer peripheral surface of the rotary shaft 10 and removed from the tool mounting portion 24 side.

That is, in this case, it is not necessary to disassemble the non-rotating support member 11 for supporting the rotating shaft 10 and the oil passage connector 14 integrally formed with the supporting member 11 from the rotating shaft 10.

According to the sixth aspect of the present invention, the outer peripheral surface of the sleeve 19 is removed by cutting debris or the like that enters between the outer peripheral surface of the sleeve 19 and the inner peripheral surface of the non-rotating oil supply ring 13 due to long-term use. When the sleeve 19 is worn and a dent is generated, and the oil tightness between the two is lost and the sleeve 19 needs to be replaced, the detachable oil passage pipe 15a is removed from the oil passage connector 14, and the Sleeve 1 with rotating refueling ring 13
9 may be moved along the outer peripheral surface of the rotary shaft 10 and removed from the tool attachment portion 24 side.

That is, also in this case, it is not necessary to disassemble the non-rotating support member 11 supporting the rotating shaft 10 and the oil passage connector 14 integrally formed with the supporting member 11 from the rotating shaft 10.

The replaced new sleeve 19 is again mounted on the outer peripheral surface of the rotary shaft 10 together with the non-rotating oil supply ring 13, and the oil passage pipe 15a is connected to the oil passage connector 14 to thereby provide a series of oil supply. A passage is formed.

According to the invention of claim 7, the oil-tight ring 20 is provided between the non-rotating oil supply ring 13 and the sleeve 19.
Therefore, the oil tightness between the two is good.

According to the invention of claim 8, the non-rotating oil supply ring 13 is provided with screw grooves 40, 40 on both sides of the oil supply passage 17 provided on the inner peripheral surface of the non-rotating oil supply ring 13 with the oil supply passage 17 provided therebetween. Therefore, when the rotating shaft 10 is rotating, the cutting oil tends to leak to the outside from between the non-rotating oil supply ring 13 and the rotating shaft 10 by the friction action between the thread groove 40 and the cutting oil. Is regulated by the thread groove 40, its leakage is prevented as much as possible, and it has the effect of being pushed back to the oil supply passage 17 side. That is, the thread groove 40 is threaded in a direction of pushing back the cutting oil leaking from the outer peripheral surface of the rotary shaft 10 to the oil supply passage 17 side when the rotary shaft 10 rotates.

[0031]

FIG. 1 shows an embodiment of the present invention, in which a manipulator gripping portion 26 and a tapered shank portion 27 are concentrically formed on one end side of a rotary shaft 10 and an oil is formed on the other end portion. The mounting portion 24 of the cutting tool with hole T is formed concentrically.

The rotating shaft 10 is rotatably supported by the non-rotating support member 11 via a bearing 25, and a rotation preventing mechanism is provided on the cylinder portion 11A formed on one side of the non-rotating support member 11 in the radial direction. The combined oil passage connector 14 is attached.

The oil passage connector 14 is provided in the cylinder portion 11A so as to be slidable in a direction parallel to the rotary shaft 10 and protrudes to the side where the shank portion 27 is present. The rotation stopper member 31 is fixed between the outer end of the outer cylinder 28 and the lock nut 30 screwed into the inner cylinder 29. In addition, a spring 32a is provided inside the inner cylinder 29.
A check valve 32 including a spherical valve body 32b biased by the spring 32a so as to close the cylindrical opening 29a is mounted. The outer cylinder 28 is biased outward by a compression coil sprig 33, and the coil splint 3
3 is interposed between the end surface 34 of the outer cylinder 28 and the bottom surface of the cylinder portion 11A. As a result of the outer cylinder 28 being pushed outward by the urging force of the spring 33, the free end of the anti-rotation member 31 is provided on the rotary shaft 10 adjacent to the manipulator grip 26 in the unused state. The rotary shaft 10 and the non-rotational supporting member 11 are engaged with each other so that they cannot rotate relative to each other. Note that FIG. 1 shows a state in which the engaged state is released.

On the other hand, a non-rotating oil supply ring 13 is externally fitted to the rotary shaft 10 adjacent to the non-rotating support member 11, and locking pieces 41, 41 on both sides thereof prevent movement of the oil supply ring 13 in the axial direction. Then, only the relative rotation with respect to the rotary shaft 10 is freely attached. An annular oil supply passage 17 is formed on the inner peripheral surface of the non-rotating oil supply ring 13, and a screw groove 40 is provided on the inner peripheral surface of the non-rotating oil supply ring 13 with the oil supply passage 17 interposed therebetween. The oil supply passage 17 communicates with a radial oil supply passage 12 provided in the rotary shaft 10, and an oil passage pipe 15 is provided in a radial direction on a side of the non-rotating oil supply ring 13 facing the oil passage connector 14. The end portion of the oil passage pipe 15 is connected to a connection hole 45 provided in the cylinder portion 11A of the oil passage connector 14.

To maintain the non-rotating state of the non-rotating oil supply ring 13, the non-rotating oil supply ring 13 is regulated by the oil passage connecting tool 14 by connecting the oil passage pipe 15 to the oil passage connecting tool 14 to prevent its rotation. Although it is designed to prevent the non-rotational support member 11 and the non-rotational oil supply ring 13, engaging means 38, 39 such as concave and convex portions are provided (see FIG. 7), and the non-rotational means is provided by the engagement means. The refueling ring 13 may be maintained in the non-rotating state.

Further, as shown in FIG. 2, the cylinder portion 11
Therefore, the oil passage connector 14 is formed separately from the non-support member 11, and the two are integrally connected by bolts 49, 49. Therefore, in order to disassemble the non-rotating oil supply ring 13 from the rotary shaft 10, a locking piece (snap ring) 41 for locking the non-rotating oil supply ring 13 is provided.
By removing the bolt 49 that connects the oil passage connector 14 and the non-supporting member 11, the oil passage connector 14 becomes the oil supply pipe 15.
At the same time, it can be removed from the non-rotating support member 11,
Moreover, the non-oil supply ring 13 can be easily pulled out from the rotary shaft 11.

By disposing the non-rotating oil supply ring 13 axially adjacent to the non-rotating support member 11 in this manner, the non-rotating support member 1 pivotally supported by the bearings 25, 25.
There is no need to disassemble 1 from the time of rotation 10, and the disassembling work can be performed quickly.

Further, in the embodiment shown in FIG. 1, a drain gap 22 is provided between the non-rotating support member 11 and the non-rotating oil supply ring 13, but as shown in FIG. A drain passage 50 communicating with the outside may be provided in the non-rotating oil supply ring 13 itself between the support member 11 and the non-rotating oil supply ring 13. In this case, it is not always necessary to provide a gap between the non-rotating support member 11 and the non-rotating oil supply ring 13 as shown in FIG. The non-rotating oil supply ring 13 may be provided so as to be in close contact with the rotation supporting member 11, or may be provided integrally with the non-rotation supporting member 11.

Further, in the embodiment shown in FIG. 1, the non-rotating support member 11 is provided with the non-rotating oil supply ring 13 separately and independently, but as shown in FIG.
1 and the rotary oil supply ring 13 may be integrally provided. That is, the non-rotating support member 11 is extended in the axial direction, and the non-rotating oil supply ring member 1 is provided on the inner peripheral side of the extension portion 11a.
3a is attached to the non-rotating oil supply ring member 13 by the locking pieces 41, 41, 41 provided on the extension side and the rotary shaft side.
It is also possible to prevent the movement of “a” in the axial direction and to mount it so that only relative rotation with respect to the rotary shaft 10 is possible.

In the embodiment shown in FIGS. 1 to 6,
Non-rotating oil supply ring 13 or non-rotating oil supply ring member 13
The inner peripheral surface of a directly contacts the rotating shaft 10. However, in order to reduce friction between the two as much as possible, the materials of the both are changed, for example, the material of the non-rotating oil supply ring 13 is changed to the rotating shaft 10. It is preferable to form a gun metal or a hard resin material with respect to the steel material as the material. The oil-tight ring 20a may be provided on the inner peripheral surface of the non-rotating oil supply ring 13 or the non-rotating oil supply ring member 13a as shown in FIG.

Further, as shown in FIG. 7, a sleeve 19 may be interposed between the non-rotating oil supply ring 13 and the rotary shaft 10 and the sleeve 19 may be fixed to the rotary shaft 10 by a lock nut 41a. That is, an annular oil supply passage 17 is provided on the inner peripheral surface of the non-rotating oil supply ring 13, and a through hole 19a communicating with the oil supply passage 17 is formed in the sleeve 19. The oil supply passage 17 and the through hole 19a are sandwiched therebetween. A pair of oil-tight rings 20 that are in contact with the outer peripheral surface of the sleeve 19 are attached to the inner peripheral surface of the non-rotating oil supply ring 13.

Further, the oil passage pipe 15a projecting from the non-rotating oil supply ring 13 is urged by the spring 43 to move in a protruding manner, and also moves backward against the urging force of the spring 43. Then, when it is urged by the spring 43 and protrudes, it is connected to the oil passage 16 of the oil passage connector 14. FIG.
In this embodiment, the oil passage connector 14 is directly connected to the connection hole 45 provided in the cylinder portion 11A.
As shown in FIG. 7, the cylinder portion 11A of the oil passage connector 14 is shown.
Hole 4 provided in a cylindrical body 44 that is oil-tightly fitted to the outer peripheral side of the
5a may be connected to the oil passage 16 of the oil passage connector 14 by fitting the tip end portion of the oil passage pipe 15a to the 5a,
With this cylindrical body 44, since the outer peripheral surface of the cylinder portion 11A can be rotated in the circumferential direction, there is an advantage that the mounting position of the oil passage pipe 15 with respect to the oil passage connector 14 in the circumferential direction can be adjusted. .

The sleeve 19 is made of a general steel plate plated with chrome, made of hardened steel or cemented carbide, or coated with ceramics or titanium nitrite. It is preferably formed of an abrasive material.

The bearing 25 on the inner peripheral surface of the sleeve 19
A sub oil-tight ring 21 is attached to the side so as to be in close contact with the outer peripheral surface of the rotating shaft 10, and a contact plate 36 and a sliding contact plate 37 are provided between the non-rotating oil supply ring 13 and the sleeve 19 and the non-rotating support member 11. Is intervened.

When the tool holder is in use, the non-rotating support member 11 has the oil passage connector 14 which also serves as a rotation stopper.
Refueling stand 23 provided on the fixed part 47 (FIG. 1) of the machine tool
The locking member 31 retracts against the urging force of the coil spring 33 by being locked to, and the engagement state between the member 31 and the engaging groove 35 on the rotating shaft 10 side is released, and the rotating shaft 10 Is rotatably held. Therefore, while the rotary shaft 10 is supported by the non-rotary support member 11, a predetermined cutting process is performed by the rotary cutting tool T attached to the tool attachment portion 24 at the tip of the rotary shaft 10.

The cutting oil (coolant) sent out from the oil supply groove 23a of the oil supply table 23 pushes the check valve 32 open to open the oil passage 16 of the oil passage connector 14, the oil passage 18 of the oil passage 15, While passing through the oil supply passage 17 of the non-rotating oil supply ring 13 and the inner peripheral surface of the non-rotating oil supply ring 13 directly and oil-tightly contacts the outer peripheral surface of the rotary shaft 10, the oil-tightness is appropriately maintained,
Alternatively, the cutting oil passes through the tool oil supply passage 12 on the rotary shaft 10 side while the oil tightness is appropriately maintained by the pair of oil tight rings 20, 20 between the relative interfaces between the non-rotating oil supply ring 13 and the sleeve 19. Is supplied to the oil hole h of the cutting tool T, and the coolant is discharged from the tip of the tool T.

At this time, when no oil-tight member is interposed between the two as shown in FIG. 1, or between the non-rotating support member 11 and the rotary shaft 10 or the sleeve 19 as shown in FIGS. 6 and 7. Even if the oil-tight rings 20 and 20a are interposed in the bearing, there is a risk that the coolant leaks to the bearing 25 side that supports the non-rotational supporting member 11 and damages the bearing 25. The drains 22 and 22a are directly interposed between the rotary oil supply ring 13 and the non-rotational support member 11, or the non-rotational oil supply ring 13 and the non-rotational support member 11 are provided.
Since the drain passage 50 communicating with the outside is provided inside the non-rotating refueling ring 13 itself, even if the coolant unexpectedly flows out to the bearing 25 side, the drain 22, 22a, 50 Since the coolant is discharged to the outside, the coolant does not enter the bearing 25.

[0048]

According to the invention of claim 1, the inner peripheral surface of the non-rotating oil supply ring contacting with the outer peripheral surface of the rotary shaft is worn due to long-term use, and the oil tightness therebetween is slightly lost. In this case, since the drain for draining the oil is interposed between the non-rotating support member and the non-rotating oil supply ring, the cutting oil leaked between the non-rotating oil supply ring and the rotating shaft is not supported by the non-rotating support member. It is possible to maximize the fail-safe function without being discharged to the outside from the drain before reaching the bearing part and entering the bearing part.

Therefore, not only the non-rotating support member for supporting the rotating shaft 10 and the oil passage connector integrally formed with the rotating shaft 10 need not be disassembled from the rotating shaft, but also the non-rotating oil supply ring hardly needs to be replaced. .

According to the second aspect of the present invention, even if the cutting oil unexpectedly leaks from between the non-rotating oil supply ring and the rotary shaft, the non-rotating oil supply is performed before the cutting oil enters the bearing portion of the non-rotating support member. The fail-safe function can be maximized without being discharged to the outside from the drain passage provided in the ring itself and entering the bearing portion. In this case, the non-rotational oil supply ring may be provided in close contact with the non-rotational support member, or the non-rotational oil supply ring may be provided integrally with the non-rotational support member.

According to the third aspect of the present invention, even if the cutting oil unexpectedly leaks from between the non-rotating oil supply ring and the rotary shaft, the drain gap is provided before entering the bearing portion of the non-rotating support member. Is discharged to the outside from the outside and does not invade the bearing portion, so that the fail-safe function can be maximized and the non-rotating oil supply ring is provided separately from the non-rotating support member. The material of the non-rotating refueling ring can be freely selected by changing it to the non-rotating support member, and can be formed on the rotating shaft made of steel, for example, by a gunmetal or a hard synthetic resin material. Wear of the ring can be prevented as much as possible.

According to the fourth aspect of the present invention, even if the cutting oil unexpectedly leaks from between the non-rotating oil supply ring and the rotating shaft, it is discharged from the drain passage before reaching the bearing portion of the non-rotating support member. It will not be discharged to the outside and will not enter the bearing part, so that the fail-safe function can be maximized, and the non-rotating oil supply ring is integrated with the non-rotating support member, so The oil supply ring is securely supported by the non-rotating support member, has a simple structure, and can be stably used.

According to the fifth aspect of the present invention, the non-rotating oil supply ring is crushed by cutting debris or the like entering between the outer peripheral surface of the rotary shaft and the inner peripheral surface of the non-rotating oil supply ring due to long-term use. If the peripheral surface becomes worn and dents occur and the oil tightness between the two is lost and the non-rotating oil supply ring needs to be replaced, only the non-rotating oil supply ring can be removed from the rotating shaft. Since there is no need to disassemble the non-rotating support member or the oil passage connector that supports the bearing from the rotating shaft, the replacement work is extremely easy.

According to the sixth aspect of the invention, the outer peripheral surface of the sleeve is abraded by cutting debris entering between the outer peripheral surface of the sleeve and the inner peripheral surface of the non-rotating oil supply ring due to long-term use. If a dent occurs and the oil-tightness between the two is lost and the sleeve needs to be replaced, remove the removable oil passage pipe from the oil passage connector, and then remove the sleeve together with the non-rotating oil supply ring. It may be moved along the outer peripheral surface of the rotary shaft and removed from the tool mounting portion side.

That is, also in this case, the non-rotating support member for supporting the rotary shaft and the oil passage connector integrally formed with the rotary shaft do not need to be disassembled from the rotary shaft at all, and the replacement work is extremely easy.

According to the invention of claim 7, since the oil-tight ring is interposed between the non-rotating oil supply ring and the sleeve, the oil-tightness between the two is good.

Further, according to the invention of claim 8, since the non-rotating oil supply ring is provided with screw grooves on both sides of the oil supply passage provided on the inner peripheral surface of the non-rotating oil supply ring, the rotary shaft of the rotating shaft is provided. When the cutting oil tries to leak to the outside from between the non-rotating oil supply ring and the rotating shaft during rotation, the cutting oil is restricted to the thread groove by the frictional action between the thread groove and the cutting oil, and the leakage Has the effect of being blocked as much as possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a cross-sectional view showing the main parts of the other embodiment.

FIG. 4 is a front view of a main part of the embodiment.

FIG. 5 is a cross-sectional view showing the main parts of another embodiment.

FIG. 6 is a cross-sectional view showing the main parts of yet another embodiment.

FIG. 7 is a perspective view showing a main part of another embodiment.

FIG. 8 is a cross-sectional view showing a main part of a conventional example.

FIG. 9 is a sectional view showing a main part of a conventional example.

[Explanation of symbols]

 10 rotating shaft 11 non-rotating support member 12 tool supply oil passage 13 non-rotating oil supply ring 14 oil passage connector 15 oil passage pipe 15a oil passage pipe 16 oil passage 17 oil passage 18 oil passage 19 sleeve 20 oil tight ring 20a oil tight ring 22 drain 22a drain

Claims (8)

[Claims] 1. A tool holder comprising a rotating shaft attached to a spindle of a machine tool and a non-rotating supporting member rotatably supporting the rotating shaft, wherein the tool holder is axially adjacent to the non-rotating supporting member, A non-rotating oil supply ring, which communicates with a tool oil supply passage provided on the rotating shaft, is fitted onto the rotating shaft, and a drain is interposed between the non-rotating support member and the non-rotating oil supplying ring. A tool holder that is connected to an oil passage connector on the machine side by an oil passage, and connects the oil passage of the oil passage connector and the oil passage of the non-rotating oil supply ring via the oil passage of the oil passage pipe. Refueling equipment in. 2. The oil supply device for a tool holder according to claim 1, wherein the drain is a passage provided between the non-rotational support member and the non-rotational oil supply ring and provided inside the non-rotational oil supply ring. 3. The oil supply device for a tool holder according to claim 1, wherein the drain is a gap provided between the non-rotational support member and the non-rotational oil supply ring, and is interposed therebetween. 4. The oil supply device for a tool holder according to claim 1, wherein the drain is a passage provided integrally with a non-rotational support member and a non-rotational oil supply ring, and provided therebetween. 5. The non-rotating support member and the non-rotating oil supply ring are separately provided, and an oil passage pipe connecting the non-rotating oil supply ring and an oil passage connector on the machine tool side is detachably provided. The oil supply device in the tool holder as described in any one of to 3. 6. A non-rotating support member and a non-rotating oil supply ring are separately provided, and an oil passage pipe connecting the non-rotating oil supply ring and an oil passage connector on the machine tool side is detachably provided, and the non-rotation oil supply is also provided. The oil supply device for a tool holder according to claim 1, 2, 3, or 5, wherein a sleeve that rotates integrally with the rotary shaft and is removable from the rotary shaft is interposed between the ring and the rotary shaft. 7. The oil supply device for a tool holder according to claim 6, wherein an oil-tight ring is interposed between the non-rotating oil supply ring and the sleeve. 8. The oil supply in the tool holder according to claim 1, wherein the non-rotating oil supply ring has an inner peripheral surface provided with thread grooves on both sides thereof with an oil supply passage provided in the inner peripheral surface being sandwiched therebetween. apparatus.