JP2000230617A - Nut member cooling method and cooling device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for cooling a nut for effectively and efficiently cooling a heat generating part and simultaneously improving lubrication. SOLUTION: When rotating a nut member 1 supported rotatably by a bearing 5 by a drive motor 9 to reciprocate a ball screw 3, by injecting air from an air injection port 27 provided to the bearing 5, the air is blown by a peripheral groove 33 and a rotation seal 45 to a ball 25 and a ball bearing 41 from a plurality of openings 43 via an air supply passage 39 provided to the nut member 1 which is rotating, thereby cooling the nut member 1. By mixing oil mist in the air, the nut member 1 can be cooled and simultaneously the ball 25 and the ball bearing 41 can be lubricated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut member cooling method and a nut member cooling device for relatively reciprocating a ball screw by rotating a nut member.

[0002]

2. Description of the Related Art Referring to FIG. 6, conventionally, a moving mechanism for relatively moving a nut member 105 attached to a moving body such as a table 103 with respect to a ball screw 101 by rotating the ball screw 101 uses a ball screw. 1
The ball screw 101 itself is cooled by providing a hole 107 in the air supply device 01 and flowing air or the like.

Alternatively, as shown in FIG. 7, when a nut 109 is rotated by a motor 109 to reciprocate a ball screw 113 in a vertical direction in FIG. 7, a thin hole 115 is formed at the center of the ball screw 113. To open the ball screw 11 where the ball 117 does not contact.
By passing air or the like through an inlet 119 provided at the bottom of the ball screw 113 and the nut member 111
Cooling is being done.

[0004]

However, in such a conventional technique, since the holes 107 and 115 are provided over the entire length of the ball screws 101 and 113, there is a problem that processing is difficult. Further, even if the processing is completed, if the holes 107 and 115 are displaced from the core of the screw, there is a problem that a swing (a so-called jumping rope phenomenon) occurs during rotation and becomes unstable.

Although heat is generated at the contact portion between the ball screws 113, there is a problem in that a portion that does not generate heat is cooled and wasteful.

Further, if a thin hole 121 is provided in the bottom of the screw, there is a problem that the consumption of air is large, and the cooling effect is low at a place far from the inlet 119.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned prior art, and a method for cooling a nut member and a nut member for effectively and efficiently cooling a heat generating portion and at the same time improving lubrication. To provide a cooling device.

[0008]

In order to achieve the above object, a method for cooling a nut member according to the present invention comprises:
A nut member is rotated by a drive motor, and a ball screw screwed with the nut member is caused to reciprocate relatively by a function of a ball provided inside the nut member. Air is supplied to a ball receiver rotatably held between the nut member and the ball screw to cool the ball receiver.

Therefore, when the ball screw is reciprocated by rotating the nut member by the drive motor, air is blown onto the ball provided inside the nut member and the ball receiver rotatably holding the ball. ,
Cool the nut member.

According to a second aspect of the present invention, there is provided a method of cooling a nut member according to the first aspect.
The method is characterized in that a lubricating oil mist is mixed into the air and supplied.

Accordingly, when air is blown into the air when air is blown onto the ball and ball receiver of the nut member, the ball and the ball receiver can be lubricated.

According to a third aspect of the present invention, there is provided a cooling device for a nut member, wherein the nut member rotatably supported by a bearing is rotated by a drive motor, and the nut member is rotated by a ball provided inside the nut member. What is claimed is: 1. A cooling device for a nut member, which relatively reciprocates a threaded ball screw, comprising: an air injection port provided in the bearing; and a nut for supplying air injected from the air injection port to a rotating nut member. A peripheral groove provided in the member, a rotary seal rotatably holding the peripheral groove sandwiched between the peripheral groove, and a shaft on an outer peripheral side of the ball in the nut member for flowing air supplied to the peripheral groove And a plurality of openings for supplying air from the air supply path to the ball. Than it is.

Therefore, when the nut member rotatably supported by the bearing is rotated by the drive motor to reciprocate the ball screw, when air is injected from the air injection port provided in the bearing, the circumferential groove and the rotation are reduced. Air is supplied to the rotating nut member by the seal, and air is blown from an opening to the ball and the ball receiver through an air supply path provided in the nut member to cool the nut member.

According to a fourth aspect of the present invention, there is provided a nut member cooling apparatus according to the third aspect.
A plurality of sets of the air inlet, the peripheral groove, the rotary seal, the air supply path, and the opening are provided.

Therefore, since two or more sets of the air inlet for supplying air, the peripheral groove, the rotary seal, the air supply path, and the opening are provided, the air is independently supplied to the ball and the ball receiver. Spray.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1A and 1B show a nut member 1 and a ball screw 3 according to the present invention. The nut member 1 is rotatably supported by a bearing 5 and is integrally attached to a rotor 11 of a drive motor 9 via a spanning ring 7.

Outer stator 1 of drive motor 9
In 3, a coil 17 is wound around an iron core 15, and a rotor 11 having a magnet 19 is rotatably supported on the stator 13 by a bearing 21 inside the stator 13. The stator 13 of the drive motor 9 is integrally attached to a fixed portion 23 of the bearing 5. A ball screw 3 is provided inside the nut member 1 so as to be vertically movable in FIG.

With the above configuration, the rotor 1 of the drive motor 9
When 1 rotates, the nut member 1 rotates integrally, and the ball screw 3 moves vertically through the ball 25 in FIG.

An air inlet 27 for sending air is provided on the outer periphery of the fixed portion 23 (lower center in FIG. 1A) of the bearing 5, and the air from the bearing portion toward the center from the air inlet 27 is provided. A supply path 29 is provided.

At a position on the bottom 31 of the ball screw 3 opposite to the bearing air supply passage 29, a circumferential groove 33 for connecting the bearing air supply passage 29, which is a fixed side, to the rotation side is provided over the entire circumference. This circumferential groove 3
Rotation seals 35 are provided on both sides of 3 to prevent air leakage during rotation.

An air supply passage 37 is provided from the circumferential groove 33 toward the center. The air supply path 37 is connected to a vertical air supply path 39 that passes in the vertical direction in FIG. 1A near the ball 25, and is provided with an upper end 39 A of the vertical air supply path 39.
Is closed.

Further, referring also to FIG. 1 (B),
In order to transmit a force between the ball screw 3 and the nut member 1 via the ball 25, the ball 25 is rotated and slightly moved freely. , And is open to the ball receiver 41. A seal 45 is provided between the inner surface of the bottom 31 of the nut member 1 and the ball screw 3.
Is attached.

With the above structure, when air is supplied from the air inlet 27 when the nut member 1 is rotated by the rotation of the drive motor 9 to move the ball screw 3 in the vertical direction in FIG. Circumferential groove 3 from supply path 29
The air is sent to the center-facing air supply path 37 of the rotating nut member 1 via the ball 3, and further from the vertical air supply path 39 to the ball 25 through the ball air supply path 43.
And air is supplied to the ball receiver 41.

Since the upper end of the vertical air supply path 39 is closed, all the supplied air is supplied to the ball 25 and the ball receiver 41. The air supplied to the ball receiver 41 cannot escape downward in FIG. 1A due to the seal 45, and the nut member 1 and the ball screw 3
Flows upward in FIG. 1 (A).

From the above results, the ball 25 that generates the most heat
Further, since cooling air can be supplied to the ball receiver 41, the nut member 1 can be efficiently cooled. The air is supplied by the nut member 1 and the ball screw 3
Therefore, the nut member 1 and the ball screw 3 can be cooled. Furthermore, lubrication of the nut member 1 and the ball screw 3 can be achieved by intermittently mixing the oil mist. Further, since only the processing of the short nut member 1 is sufficient, the processing can be easily performed.

Referring to FIG. 2, a bending machine 47 is shown as an example of a processing machine to which the above-described drive mechanism including the drive motor 9, the ball screw 3 and the nut member 1 is applied. In the bending machine 47, a lower table 51 is fixed to a lower front surface (a right side surface in FIG. 2) of a frame 49, and a die D is mounted on an upper end of the lower table 51.

On the other hand, an upper table 53 is provided on the upper front surface of the frame 49 so as to be able to move up and down opposite to the lower table 51, and a punch P is mounted on a lower end of the upper table 53. The drive mechanism described above is provided above the upper table 53 in the frame 49, and the upper table 53 is attached below the ball screw 3.

Accordingly, the nut member 1 is driven by the drive motor 9.
The upper table 53 is moved up and down by rotating the ball screw 3 up and down by rotating
The work W is bent in cooperation with the above.

Next, a nut member 55 according to another embodiment will be described with reference to FIG. In addition, the same parts as those of the nut member 1 shown in FIG. 1 described above are denoted by the same reference numerals, and redundant description will be omitted.

In the nut member 55, an opening 57 is provided on the outer peripheral surface of the nut member 55 at the upper end of the vertical air supply passage 39, and the air sent from the vertical air supply passage 39 is supplied to the drive motor 9. Flows between the rotor 11 and the stator 13 and is discharged.

With the above configuration, the vertical air supply path 3
9 supplies air to the ball receiver 41,
The air is supplied between the rotor 11 and the stator 13 of the drive motor 9 from the upper end opening 57 of the vertical air supply path 39 and exits from above the drive motor 9 to the outside.

With the above configuration, cooling air is blown onto the ball 25 and the ball receiver 41 which generate the most heat to cool the ball 25 and the ball receiver 41.
Since the air flows between the stator 1 and the stator 13, the nut member 1 and the drive motor 9 can be effectively cooled. Further, when oil mist is mixed, the oil mist can be supplied to the right portion of the ball 25 and the ball receiver 41, so that effective lubrication can be achieved.

Next, a nut member 59 according to another embodiment will be described with reference to FIGS. 4 (A) and 4 (B).
In addition, the same parts as those of the nut member 1 shown in FIG. 1 described above are denoted by the same reference numerals, and redundant description will be omitted.

In the nut member 59, the vertical air supply path 39 is provided in contact with the ball receiver 41 in FIG. 4A, and as shown in FIG. Is provided with an opening 61. Further, two vertical air supply paths 39, 39 are provided at substantially symmetrical positions, and the center-facing air supply path 3 for supplying air to the vertical air supply paths 39, 39 is provided.
7, 37, peripheral grooves 33, 33, rotary seals 45, 45, and two air injection ports 27, 27 are also provided.

With the above configuration, each of the air injection ports 27, 2
The air supplied from 7 is supplied to each vertical air supply path 3
Air is supplied from 9 and 39 to the ball receiver 41, and is supplied between the rotor 11 and the stator 13 of the drive motor 9 through a gap between the nut member 59 and the ball screw 3, and escapes from the upper portion of the drive motor 9 to the outside. .

From the above results, the cooling air can be supplied to the ball 25 and the ball receiver 41, which generate the most heat, by the two sets of vertical air supply paths 39, 39, so that the nut member 59 can be efficiently cooled. It can be performed.

Since oil can be supplied to the ball 25 and the ball receiver 41 by intermittently mixing the oil mist, the nut member 59 can be cooled and the nut member 59 and the ball screw 3 can be lubricated simultaneously. Can be.

Next, a nut member 63 according to another embodiment will be described with reference to FIG. Parts common to the nut members 1, 55, and 59 shown in FIGS. 1, 3, and 4 are denoted by common reference numerals, and redundant description will be omitted.

In this nut member 63, the upper end of the vertical air supply path 39 has an opening 57 between the rotor 11 and the stator 13 of the drive motor 9, as in the embodiment shown in FIG. Is provided. Similarly to the embodiment shown in FIG. 4, two sets are provided at substantially symmetric positions.

With the above arrangement, the ball 25 and the ball receiver 41 are provided by the two vertical air supply paths 39, 39.
Air is supplied to the
Air is supplied between the rotor 11 and the stator 13 of the drive motor 9 from the upper end opening 57 of the drive motor 9 and escapes from the upper portion of the drive motor 9 to the outside.

With the above construction, cooling air is blown to the ball 25 and the ball receiver 41 which generate the most heat by the two vertical air supply paths 39, 39, and at the same time, the rotor 11 of the drive motor 9 is rotated. And stator 13
Since the air flows between the nut members 63, the nut member 63 and the drive motor 9 can be effectively cooled. Further, when oil mist is mixed, the oil mist can be supplied to the frictional portion between the ball 25 and the ball receiver 41, so that effective lubrication can be achieved.

It should be noted that the present invention is not limited to the above-described embodiment of the present invention, but by making appropriate changes,
It can be implemented in other aspects. That is, in FIGS. 4 and 5 described above, two sets of the vertical air supply paths 3 are provided.
Although air is supplied to 9, 9 and the like, air may be supplied to one side for cooling, and the other may contain oil mist for lubrication.

In the above-described embodiment, the case where the nut members 1, 55, 63 are rotated at a predetermined position by the drive motor 9 to reciprocate the ball screw 3 has been described. The same applies to the case where the nut members 1, 55, 63 move. However, in this case, the air inlet 27
It is necessary to use a movable member such as a flexible pipe to supply air to the air.

[0045]

As described above, in the method for cooling a nut member according to the first aspect of the present invention, when the ball screw is reciprocated by rotating the nut member by the drive motor,
Since the air is blown to the ball provided inside the nut member, which is the heat generating portion, and the ball holder rotatably holding the ball, the nut member can be cooled efficiently.

In the method for cooling a nut member according to the second aspect of the present invention, when air is blown to the ball and ball receiver of the nut member, an oil mist is mixed into the air to cool the nut member and the ball and the ball simultaneously. Lubrication of the receiver can be achieved.

In the cooling device for a nut member according to the third aspect of the present invention, when the ball screw is reciprocated by rotating the nut member rotatably supported by the bearing by the drive motor, the air injection device provided on the bearing is provided. When air is injected from the inlet, air is blown from the opening to the ball and ball receiver through the air supply path provided in the rotating nut member by the circumferential groove and rotary seal, so the nut member is cooled efficiently. can do.

In the cooling device for a nut member according to the fourth aspect of the present invention, two or more sets of the air inlet for supplying air, the peripheral groove, the rotary seal, the air supply path, and the opening are provided. The nut member can be more effectively cooled.

[Brief description of the drawings]

FIGS. 1A and 1B are a cross-sectional view and a main part enlarged view showing an embodiment of a nut member cooling device according to the present invention.

FIG. 2 is a cross-sectional view illustrating an example in which a moving mechanism including a nut member and a ball screw illustrated in FIG. 1 is used in a processing machine.

FIG. 3 is a sectional view showing another embodiment of the cooling device for a nut member according to the present invention.

FIGS. 4A and 4B are a sectional view and a main part enlarged view showing still another embodiment of the cooling device for a nut member according to the present invention.

FIG. 5 is a sectional view showing still another embodiment of the cooling device for a nut member according to the present invention.

FIG. 6 is a cross-sectional view illustrating a conventional cooling device for a nut member.

FIG. 7 is a sectional view showing a conventional cooling device for a nut member.

[Explanation of symbols]

 1, 55, 59, 63 Nut member 3 Ball screw 5 Bearing 9 Drive motor 25 Ball 27 Air inlet 33 Peripheral groove 35 Rotating seal 39 Vertical air supply path (air supply path) 41 Ball receiver 43 Ball air supply path ( Opening)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kinshiro Naito 318-3 Ishida, Isehara-shi, Kanagawa

Claims (4)

[Claims] 1. A method of cooling a nut member, comprising rotating a nut member by a drive motor and relatively reciprocating a ball screw screwed with the nut member by the action of a ball provided inside the nut member. A method of cooling a nut member, comprising supplying air to a ball and a ball receiver that rotatably holds the ball between the nut member and a ball screw, thereby cooling the ball member. 2. The method for cooling a nut member according to claim 1, wherein a lubricating oil mist is mixed into the air and supplied. 3. A nut member rotatably supported by a bearing is rotated by a drive motor, and a ball screw screwed to the nut member is relatively reciprocated by the action of a ball provided inside the nut member. An apparatus for cooling a nut member, wherein an air injection port provided in the bearing, a peripheral groove provided in the nut member to supply air injected from the air injection port to a rotating nut member, and A rotary seal that holds a sealed state rotatably with the circumferential groove interposed therebetween, an air supply path axially provided on an outer peripheral side of the ball in the nut member to flow the air supplied to the circumferential groove, A plurality of openings for supplying air from the air supply path to the balls, the cooling device for a nut member. 4. The cooling of the nut member according to claim 3, wherein a plurality of sets of the air inlet, the peripheral groove, the rotary seal, the air supply path, and the opening are provided. apparatus.