JP2024018170A - rotary table device - Google Patents

Abstract

To provide such a structure that can prevent immersion of cutting oil into a motor cover via a discharge hole in a rotary table device which includes a main shaft attached with a circular table, a drive motor that drives the main shaft and the motor cover that is attached to a frame so as to cover the drive motor and is configured to be usable in both installation states of a vertically-placed state and a horizontally-placed state.SOLUTION: A rotary table device includes a first discharge hole for the vertically-placed state and a second discharge hole for the horizontally-placed state as the discharge holes for discharging cutting oil in a motor cover. Each discharge hole is formed on a frame and includes: an inflow part which communicates with a lower portion of a space in the motor cover; a discharge part which is opened to a surface that is a bottom surface of the frame in the installation state thereof and is located on the side of the surface that is the bottom surface of the frame in the installation state of the other with respect to the inflow part; and a communication part which communicates with the inflow part and the discharge part.SELECTED DRAWING: Figure 7

Description

A rotary table device that includes a main shaft rotatably supported by a frame and a rotary table attached to an end of the main shaft, and that determines the angular position of the rotary table, and a drive motor that is attached to the frame and drives the main shaft. , a motor cover attached to the frame to cover the drive motor, and used both in a vertical position where the axis of the main shaft is parallel to the horizontal direction, and in a horizontal position where the axis is parallel to the vertical direction. The present invention relates to a rotary table device that can be configured.

An example of such a rotary table device is one disclosed in Patent Document 1. The rotary table device includes a frame installed on an installation surface of a machine tool, a main shaft rotatably supported within the frame via a bearing, and a rotary table attached to an end of the main shaft. There is. Note that the rotary table device of Patent Document 1 is a so-called vertical rotary table device that is installed in a vertical state in which the axis of the main shaft is parallel to the horizontal direction.

The rotary table device also includes a drive motor as a drive source for driving the main shaft. The drive motor is attached to a surface (motor mounting surface) that is orthogonal to both the bottom surface of the frame and the surface of the frame parallel to the main axis when placed vertically. Further, the drive motor is connected to the main shaft by a worm gear mechanism including a worm wheel attached to the main shaft and a worm shaft that meshes with the worm wheel.

The rotary table device is configured to determine the angular position of the rotary table by rotationally driving the main shaft by a drive motor. Note that the rotary table device includes a motor cover that surrounds the drive motor in order to prevent the drive motor from being exposed to coolant liquid used during processing of the workpiece. Further, the motor cover is provided on the rotary table device in a manner that it is attached to the motor mounting surface on which the drive motor is mounted as described above.

Note that the rotary table device of Patent Document 1 is a vertically placed rotary table device as described above. However, in conventionally known rotary table devices, one rotary table device can be installed not only in the vertical position as described above, but also in a horizontal position where the axis of the main shaft is parallel to the vertical direction (so-called Some devices are configured so that they can also be used as horizontal rotary table devices.

JP2008-119793

By the way, in a rotary table device equipped with such a motor cover, coolant liquid is prevented from directly splashing on the drive motor, but on the other hand, coolant liquid may seep into the motor cover and coolant may leak inside. Liquid may accumulate. Specifically, since a typical motor cover is constructed by combining a plurality of members, coolant liquid may infiltrate through gaps between the combined members. Furthermore, although a sealing member is provided between the motor cover and the frame (motor mounting surface), if the sealing member deteriorates, coolant liquid may also enter. Note that if the coolant liquid enters and accumulates inside the motor cover, there is a risk that problems such as failure of the drive motor and other electrical components may occur.

Therefore, in order to prevent such problems from occurring, conventionally, the bottom surface of the motor cover when the rotary table device is installed is used to drain the coolant that has entered the motor cover to the outside. A configuration is adopted in which a discharge hole is provided in the form of an opening. However, in the case of a configuration in which such a discharge hole is provided, coolant liquid may infiltrate through the discharge hole in a rotary table device configured to be usable both vertically and horizontally as described above. Problems such as this arise.

Specifically, when the above-mentioned discharge hole is provided, in a rotary table device configured to be usable in both states, the bottom surface of the motor cover in the vertical state and the bottom surface of the motor cover in the horizontal state The discharge holes will be formed on two surfaces, one being the bottom surface. In the rotary table device configured in this way, when the installation state is one of the above two states, the surface that becomes the bottom surface of the motor cover in the other installation state is the side surface of the motor cover. Become. That is, the rotary table device is configured such that the above-mentioned discharge hole is also opened on the side surface of the motor cover in each installed state.

Note that a large amount of coolant liquid is directly applied to the side surface of the motor cover of the rotary table apparatus (the surface other than the bottom surface of the motor cover) during processing of a workpiece. As a result of the coolant splashing onto the side surface of the motor cover where the discharge hole opens as described above, a large amount of coolant enters the inside of the motor cover through the discharge hole formed to discharge the coolant. This may cause problems such as.

In view of the above-mentioned circumstances, the present invention has been developed to prevent coolant liquid from entering the motor cover through the discharge hole in a rotary table device that can be used both vertically and horizontally. The purpose is to provide a configuration that can prevent this.

The present invention is a rotary table device that includes a main shaft rotatably supported by a frame and a rotary table attached to the end of the main shaft, and that determines the angular position of the rotary table, and is attached to the frame and drives the main shaft. and a motor cover attached to the frame to cover the drive motor, the motor can be placed in a vertical position where the axis of the main shaft is parallel to the horizontal direction, or in a horizontal position where the axis is parallel to the vertical direction. A rotary table device configured to be usable in both states is assumed. The present invention has the following features in a rotary table device based on the premise thereof.

The rotary table device has a first surface that is the bottom surface of the frame when it is placed vertically, a second surface that is the bottom surface of the frame when it is placed horizontally, and a part that is formed on the frame and has cutting oil in the motor cover. The apparatus includes a first discharge hole for discharging water in a vertically placed state, and a second discharge hole for a horizontally placed state. The first discharge hole is a first inflow part that communicates with a space inside the motor cover, and the first inflow part is formed such that the communication position is at a lower part of the space when the motor cover is placed vertically. , a first discharge part that opens to the first surface and is formed closer to the second surface than the first inflow part, and a first discharge part that communicates with the first inflow part and the first discharge part. It consists of a communication part. The second discharge hole is a second inflow part that communicates with the space, and the second inflow part is formed such that the communication position is at a lower part of the space when it is placed horizontally; a second discharge section that is open to the second surface and formed closer to the first surface than the second inflow section; and a second communication that communicates the second inflow section and the second discharge section. It is made up of parts. Note that the term "lower part of the space" as used herein refers to a portion (area) of the space within the motor cover that is below the range where the drive motor and other electrical components are present.

In the rotary table device according to the present invention, the exhaust holes (first exhaust hole, second exhaust hole) for each of the vertical and horizontal installation states are provided in the lower part of the space in each installation state. It is configured to include a communicating inflow part and a discharge part (a first discharge part, a second discharge part) that opens to the bottom surface of the frame in each installed state. Furthermore, each discharge hole is arranged so that the discharge part is located on the side of the bottom surface in the other installation state (the other installation state in which the discharge hole itself is not functioning as a discharge hole) with respect to the inflow part. The inflow portion and the discharge portion are formed to communicate with each other through a communication portion. In other words, each discharge hole is configured such that, in a direction parallel to the bottom surface in the installed state, the inlet part and the discharge part are separated from each other toward the side of the surface that becomes the bottom surface in the other installed state. It becomes.

According to the configuration, in the installation state of the other one, that is, in the installation state in which the hole itself does not function as a discharge hole, each discharge hole is connected to an inflow part communicating with the space in a direction parallel to the side surface (vertical direction). In this case, the discharge part formed at a different position opens on the side surface, and the discharge part is located below the inflow part. As a result, even if the coolant applied to the side of the frame enters the discharge hole (discharge part) opened on the side during machining of the workpiece, the coolant will flow to the inflow part located above the discharge part. There is no way to reach it directly. Therefore, the infiltration of the coolant liquid into the motor cover with which the inflow portion communicates is prevented as much as possible.

1 is an overall schematic diagram showing a vertically placed state of a rotary table device according to an embodiment of the present invention. FIG. 2 is a cross-sectional front view taken along line AA in FIG. 1. FIG. 1 is an overall schematic diagram showing a horizontally placed rotary table device according to an embodiment of the present invention. FIG. 2 is a cross-sectional front view taken along line BB showing the main parts in FIG. 1; FIG. 5 is a cross-sectional plan view taken along line CC in FIG. 4. FIG. 6 is a cross-sectional side view taken along line DD in FIG. 5; FIG. 3 is a perspective view showing a discharge hole for a vertically placed state and a discharge hole for a horizontally placed state. FIG. 4 is a partially sectional plan view showing main parts in FIG. 3; FIG. 7 is a cross-sectional side view showing a discharge hole for a vertically placed state and a discharge hole for a horizontally placed state in another embodiment of the rotary table device according to the present invention.

Hereinafter, one embodiment (example) of a rotary table device to which the present invention is applied will be described based on FIGS. 1 to 8.

FIG. 1 is a diagram schematically showing the appearance of a rotary table device 1. As shown in FIG. The rotary table device 1 includes, as its constituent elements, a frame 10 installed on an installation surface (not shown) of a machine tool, and a circular table 2 on which a workpiece is placed. Note that the circular table 2 is provided such that the surface on which the work is placed is exposed on the frame 10.

Further, as shown in FIG. 2, the rotary table device 1 includes a main shaft 3 attached to one end of the rotary table 2. The main shaft 3 is rotatably supported within a housing hole 11 formed in the frame 10 via a bearing (not shown).

Further, the rotary table device 1 includes a drive motor 4 as a drive source for rotationally driving the main shaft 3 thereof. The drive motor 4 is attached to a motor attachment surface 12 of the frame 10 via a bracket. The motor mounting surface 12 is one of the four surfaces of the frame 10 that are parallel to the axis of the main shaft 3. In the frame 10, the motor mounting surface 12 is a rectangular surface.

Further, the drive motor 4 is attached to the motor mounting surface 12 and has an output shaft 4a directed toward the motor mounting surface 12. Therefore, an insertion hole 14 is formed in the frame 10 and opens into the motor mounting surface 12 for allowing the output shaft 4a of the drive motor 4 to be placed therein.

The rotary table device 1 includes a motor cover 20 provided to cover the drive motor 4. The motor cover 20 is a casing and is configured so that one surface is opened to form an opening. In addition, in the motor cover 20, the vertical dimension of the opening is slightly smaller than the longitudinal dimension of the motor mounting surface 12, and the horizontal dimension of the opening is slightly smaller than the longitudinal dimension of the motor mounting surface 12. The size is slightly smaller than the actual size.

In addition, the motor cover 20 has the opening on the motor mounting surface 12 side, and the vertical direction of the opening coincides with the long side direction of the motor mounting surface 12 (the horizontal direction of the opening is It is attached to the motor mounting surface 12 in an orientation that matches the short side direction of the motor mounting surface 12. However, the attached state is such that the motor cover 20 is located within the existing range of the motor mounting surface 12 when viewed in a direction orthogonal to the motor mounting surface 12. As described above, in the attached state, the vertical direction of the opening and the long side direction of the motor mounting surface 12 are the same direction, and the horizontal direction of the opening and the short side of the motor mounting surface 12 are the same direction. The direction is the same direction. Therefore, in the following description, the former direction will be referred to as a "vertical direction", and the latter direction will be referred to as a "horizontal direction".

The rotary table device 1 also includes a drive transmission mechanism 30 for transmitting the rotation of the output shaft 4a of the drive motor 4 to the main shaft 3. The drive transmission mechanism 30 includes a worm gear mechanism 31 that includes a worm wheel 32 that is rotatably attached to the main shaft 3 and a worm shaft 33 that has a worm 33a that meshes with the worm wheel 32. Since the worm wheel 32 is attached to the main shaft 3, it is placed in the accommodation hole 11 in the frame 10 in which the main shaft 3 is provided.

Further, the frame 10 is formed with a through hole 13 for accommodating the worm shaft 33 therein. The through hole 13 is formed to pass through the frame 10 in a direction perpendicular to the motor mounting surface 12 and communicate with the accommodation hole 11 in which the worm wheel 32 is disposed. Further, the through hole 13 is formed to communicate with the insertion hole 14 at the end on the motor mounting surface 12 side. Moreover, the worm shaft 33 is rotatably supported within the through hole 13 via a bearing, and meshes with the worm wheel 32 at the worm 33a.

The drive transmission mechanism 30 also includes a gear train 34 consisting of a drive gear attached to the output shaft 4a of the drive motor 4 and a driven gear meshed with the drive gear and attached to the end of the worm shaft 33. In the rotary table device 1, the driving of the drive motor 4 is controlled according to a preset numerical control program, so that the main shaft 3 is rotationally driven via the gear train 34 and the worm gear mechanism 31. (Rotary table 2) is indexed to the angular position set in the numerical control program.

Moreover, the rotary table device 1 is configured so that it can be used in both vertical and horizontal installation states on the installation surface of the machine tool. Note that the vertically placed state is a state in which the rotary table device 1 is installed so that the axis of the main shaft 3 is parallel to the horizontal direction, as shown in FIG. Moreover, the horizontally placed state is a state in which the rotary table device 1 is installed so that the axis of the main shaft 3 is parallel to the vertical direction, as shown in FIG.

The rotary table device 1 is configured such that the frame 10 has a surface that becomes a bottom surface when installed on the installation surface for each installation state, as a configuration for realizing both of the installation states. There is. Specifically, the frame 10 is configured such that a surface parallel to the axis of the main shaft 3 and perpendicular to the motor mounting surface 12 can serve as the bottom surface (first surface) of the frame 10 when placed vertically. ing. Furthermore, the surface of the frame 10 that is perpendicular to the axis of the main shaft 3 and opposite to the surface on which the rotary table 2 is exposed can serve as the bottom surface (second surface) of the frame 10 when placed horizontally. It is configured as follows. In this way, the rotary table device 1 is configured to be usable in both the vertical and horizontal installation states due to the first surface 15 and the second surface 16 formed on the frame 10 as described above. It has become something like this.

In the rotary table device 1 configured as described above, the rotary table device 1 is provided with a discharge hole for discharging the cutting oil in the motor cover 20. In addition, in the present invention, the rotary table device 1 includes, as its discharge holes, a first discharge hole that is a discharge hole for a vertically placed state, and a second discharge hole that is a discharge hole for a horizontally placed state. In addition, both discharge holes are formed in the frame 10. Further, in each installation state, each discharge hole is open to the inflow portion communicating with the lower part of the space of the motor cover 20 and the bottom surface, and is located closer to the bottom surface in the other installation state than the inflow portion. and a communication section that communicates between the inlet and the discharge section. The configuration of each discharge hole in such a rotary table device 1 will be described in detail below based on FIGS. 4 to 8.

First, the first discharge hole 40 is formed by drilling the following first to third holes in the frame 10. Regarding each hole, the first hole 41 opens to the motor mounting surface 12 and is bored in the frame 10 in a manner parallel to the first surface 15 and the second surface 16. The first hole 41 is formed at a position closer to the second surface 16 than the intermediate portion of the frame 10 in the horizontal direction and closer to the first surface 15 in the vertical direction. However, the position where the first hole 41 opens with respect to the motor mounting surface 12 is a position communicating with the lower part of the space within the motor cover 20 when the motor cover 20 is placed vertically in the vertical direction. Further, the first hole 41 is formed such that the end opposite to the end (open end) of the motor mounting surface 12 is located within the frame 10 (the end is a closed end). There is.

Further, the second hole 42 is opened in the second surface 16 and is formed in the frame 10 in a manner parallel to the first surface 15 and the motor mounting surface 12 . Note that, like the first hole 41, the second hole 42 is formed such that the end opposite to the open end is a closed end, and the second hole 42 is formed such that the end opposite to the open end is a closed end, and the first hole 41 is closed at the closed end. It is formed to communicate with the end. Therefore, the position of the second hole 42 is the same as the first hole 41 in the vertical direction, and the position of the second hole 42 is the same as the first hole 41 in the direction perpendicular to the motor mounting surface 12 (width direction of the frame 10). 41 is the closed end position.

Further, the third hole 43 is opened in the first surface 15 and is bored in the frame 10 so as to be parallel to the second surface 16 and the motor mounting surface 12 . The third hole 43 is formed at the same position as the second hole 42 in the width direction, and is formed to communicate with the second hole 42 . Regarding the communication position of the third hole 43 with the second hole 42, the position in the lateral direction (the drilling direction of the second hole 42) is closer to the second surface 16 than the first hole 41. It is located at

Further, the second discharge hole 50 is formed by drilling the following fourth to sixth holes in the frame 10. Regarding each hole, the fourth hole 51 opens at one end into the motor mounting surface 12 and is parallel to the first surface 15 and the second surface 16, similar to the first hole 41. The frame 10 is perforated. Further, the fourth hole 51 is also a hole whose other end is closed (the end is a closed end). However, regarding the lateral direction, the position of the fourth hole 51 is a position that communicates with the lower part of the space inside the motor cover 20 when it is placed horizontally, and the position of the fourth hole 51 is a position that is in communication with the lower part of the space within the motor cover 20 when placed horizontally, and is located further away from the second hole than the third hole 43. The position is on the side of surface 16. Further, the position of the fourth hole 51 is on the opposite side of the first surface 15 from the first hole 41 (second hole 42) in the vertical direction. .

Further, the fifth hole 52 is opened in the first surface 15 at one end and is bored in the frame 10 in a manner parallel to the second surface 16 and the motor mounting surface 12 . The fifth hole 52 is also a hole whose other end is closed, and the closed end is formed to communicate with the closed end of the fourth hole 51. Note that the position of the fifth hole 52 is the same as the second hole 42 in the width direction. Therefore, the fifth hole 52 and the second hole 42 are formed in an intersecting state.

Further, the sixth hole 53 is opened in the second surface 16 and is bored in the frame 10 in a manner parallel to the first surface 15 and the motor mounting surface 12 . The sixth hole 53 is formed at the same position as the fifth hole 52 in the width direction, and is formed to communicate with the fifth hole 52. Regarding the communication position of the sixth hole 53 with the fifth hole 52, the position in the vertical direction (the drilling direction of the fifth hole 52) is the same as that between the fourth hole 51 and the second hole 42. It is located in between.

In the first discharge hole 40 and the second discharge hole 50 formed of the combination of holes as described above, the first discharge hole 40 has a plug for closing the open end side of the second hole 42. A first closing member 44 is provided to be inserted into the second hole 42 . However, the position where the first closing member 44 is provided is between the third hole 43 and the fifth hole 52 with respect to the lateral direction (the direction in which the second hole 42 is drilled). Similarly, the second discharge hole 50 is provided with a second closing member 54 that closes the open end of the fifth hole 52 and is fitted into the fifth hole 52 . The second closing member 54 is located between the sixth hole 53 and the second hole 42 in the vertical direction (the direction in which the fifth hole 52 is bored).

According to the rotary table device 1 configured as described above, the coolant liquid that has entered the motor cover 20 is discharged through the first discharge hole 40 when the installed state is vertically installed. When the state is horizontal, it will be discharged through the second discharge hole 50.

Specifically, first, when the rotary table device 1 is installed vertically, when the coolant applied to the motor cover 20 enters into the motor cover 20 during machining of a workpiece, the infiltrated coolant In the space inside the motor cover 20, dirt gradually accumulates from the bottom side of the motor cover 20 when it is placed vertically. Note that the first hole 41 in the first discharge hole 40 is formed so as to communicate with the lower part of the space inside the motor cover 20 in the vertically placed state. Therefore, the coolant liquid that gradually accumulates in the space reaches the position of the first hole 41 before the liquid level reaches the range where the drive motor 4 and other electrical components are present. becomes. When the level of the coolant reaches the position of the first hole 41, the coolant flows from inside the motor cover 20 toward the first hole 41.

Next, the coolant liquid that has flowed into the first hole 41 passes through the second hole 42 and flows toward the third hole 43 side. When the coolant liquid reaches the position of the third hole 43, it flows into the third hole 43 and is discharged from the open end of the third hole 43 toward the outside of the frame 10.

From the above, in the first discharge hole 40, the first hole 41 corresponds to the first inflow section in the present invention, and the third hole 43 corresponds to the first discharge section. Also, of the second hole 42 formed so as to communicate the first inflow portion 41 and the first discharge portion 43, a portion closer to the first inflow portion 41 than the first closing member 44 42a corresponds to the first communication section.

Furthermore, when the installed state is horizontal, if the coolant liquid infiltrates into the motor cover 20 as in the case where it is installed vertically, the infiltrated coolant liquid will be disposed of in the space inside the motor cover 20 when the motor cover 20 is installed horizontally. In this state, dirt gradually accumulates from the bottom side of the motor cover 20. Note that the fourth hole 51 in the second discharge hole 50 is formed so as to communicate with the lower part of the space of the motor cover 20 in the horizontally placed state. When the level of the coolant liquid reaches the position of the fourth hole 51, the coolant liquid flows from inside the motor cover 20 toward the fourth hole 51. Then, the coolant liquid that has flowed into the fourth hole 51 flows toward the sixth hole 53 side via the fifth hole 52, and flows from the open end of the sixth hole 53 to the outside of the frame 10. It will be discharged towards.

From the above, in the second discharge hole 50, the fourth hole 51 corresponds to the second inflow section in the present invention, and the sixth hole 53 corresponds to the second discharge section. Also, of the fifth hole 52 formed to communicate the second inflow portion 51 and the second discharge portion 53, a portion closer to the second inflow portion 51 than the second closing member 54 52a corresponds to the second communication section.

In the rotary table device 1 in which the first discharge hole 40 and the second discharge hole 50 are formed, for example, when the rotary table device 1 is placed vertically, the first discharge hole 40 discharges the coolant liquid as described above. The second discharge hole 50 is a hole that does not function as a discharge hole. Moreover, a second discharge hole 50 is formed to open the second discharge part 53 to the second surface 16 (the surface that becomes the bottom surface of the frame 10 when placed horizontally). Since the surface 16 is the side surface of the frame 10 when placed vertically, the second discharge hole 50 (second discharge portion 53) is the side surface of the frame 10 when the rotary table device 1 is placed vertically. It becomes open to the surface. Therefore, during machining of a workpiece, the coolant liquid applied to the frame 10 enters into the second discharge hole 50 from the second discharge portion 53 thereof.

However, the second discharge hole 50 is formed such that the second discharge part 53 is located closer to the first surface 15 than the second inflow part 51 in the vertical direction. Therefore, in the vertically placed state, the second discharge hole 50 is in a state in which the second inflow portion 51 is located above the second discharge portion 53. Thereby, even if the coolant liquid enters from the second discharge part 53 as described above, the coolant liquid will not directly reach the second inflow part 51 located above the second discharge part 53. There is no. As a result, the infiltration of the coolant liquid into the motor cover 20 from the second discharge hole 50, which does not function as a discharge hole, is prevented as much as possible.

Similarly, in the horizontal position, the first discharge hole 40 that does not function as a discharge hole is opened at the first discharge part 43 with respect to the first surface 15, which is the side surface of the frame 10 in the horizontal position. It becomes a state where However, the first discharge hole 40 is formed such that the first discharge part 43 is located closer to the second surface 16 than the first inflow part 41 in the lateral direction. In the placed state, the first inflow section 41 is located above the first discharge section 43. Therefore, even if coolant liquid enters from the first discharge part 43 during machining of a workpiece, the coolant liquid will directly flow to the first inflow part 41 as in the second discharge hole 50 in the vertically placed state. Therefore, the infiltration of the coolant liquid into the motor cover 20 from the first discharge hole 40, which does not function as a discharge hole, is prevented as much as possible.

As described above, in the rotary table device 1, in both the vertical and horizontal installation states, one of the first discharge hole 40 and the second discharge hole 50 is connected to the motor cover during machining of the workpiece. It functions as a hole for discharging the coolant liquid that has entered and accumulated in the hole 20. As a result, in either of the two installation states, the coolant that has entered the motor cover 20 can be removed from one of the motor covers 20 before it accumulates in the motor cover 20 to the extent that it causes problems such as failure of the drive motor 4, etc. It is discharged from inside the motor cover 20 to the outside of the frame 10 through the discharge hole. Moreover, according to the rotary table device 1, although the rotary table device 1 is provided with discharge holes corresponding to both installation states, the first discharge hole 40 and the second discharge hole do not function as discharge holes in each installation state. Since the other of the exhaust holes 50 is configured as described above, the coolant liquid is prevented from entering the motor cover 20 from the other exhaust hole as much as possible.

Above, one embodiment of the rotary table device to which the present invention is applied (hereinafter referred to as "the embodiment") has been described. However, the present invention is not limited to the above-described embodiments, and may be implemented in other embodiments (modifications) as described below.

(1) Regarding each discharge hole, in the embodiment, in the first discharge hole 40, the first inflow portion 41 is located closer to the second surface 16 than the intermediate portion of the frame 10 in the lateral direction, The first discharge section 43 is formed to be located closer to the second surface 16 than the first inflow section 41 . However, in the present invention, the first inflow part and the first discharge part in the first discharge hole are not limited to those formed at the positions as in the above embodiment with respect to the lateral direction. As long as the discharge part satisfies the positional relationship of being located closer to the second surface 16 than the first inflow part, it may be formed at any position in the lateral direction.

The same applies to the second discharge hole. Specifically, in the embodiment, the second discharge hole 50 is such that the second inflow section 51 is opposite to the first surface 15 with respect to the first inflow section 41 (first communication section 42a) in the vertical direction. is located on the opposite side, and the second discharge portion 53 is located closer to the first surface 15 than the second inflow portion 51 . However, the second discharge hole can be formed at any position in the longitudinal direction as long as the second discharge part is located closer to the first surface 15 than the second inflow part. You can leave it there.

(2) Regarding the communication part of each discharge hole, in the above embodiment, both discharge holes have a first communication part 42a in the first discharge hole 40 and a second communication part 52a in the second discharge hole 50. They are formed to be located at the same position in the width direction. Therefore, in this configuration, the second hole 42 forming the first communication section 42a and the fifth hole 52 forming the second communication section 52a are formed to intersect with each other. However, in the present invention, both discharge holes are not limited to those in which the communication portions are formed at the same position in the width direction, and the discharge holes are formed so that the communication portions in the width direction are located at the same position. They may also be formed differently. In that case, the second hole and the fifth hole will be formed in such a way that they do not intersect.

(3) Concerning the closing member in each discharge hole, in the embodiment described above, the first discharge hole 40 is provided with the first closing member 44 for closing the open end of the second hole 42, and the second A second closing member 54 for closing the open end of the fifth hole 52 is provided in the discharge hole 50 . That is, each of the discharge holes in the above embodiment is formed such that the hole for forming the communication portion opens in the bottom surface of the frame 10 in the other installed state, and the opening is closed with a closing member. is configured to be However, in the present invention, if each discharge hole is formed in this way, it is possible to omit the closing member. That is, the present invention is not limited to providing a closing member in each discharge hole.

In addition, if the hole for forming the communication part is formed to open on the bottom surface of the frame 10 in the other installed state as described above, the discharge hole is connected to the opening and the motor cover 20. It is configured such that a discharge section exists between the inflow section and the communicating inflow section. Thereby, even if the coolant liquid enters from the opening, the infiltrated coolant liquid reaches the discharge part before reaching the inflow part, and is discharged from the discharge part to the outside of the frame 10. Therefore, it is difficult for the coolant liquid that has entered through the opening to reach the inflow portion and enter the motor cover 20, so even if the closing member is omitted, the coolant liquid can still enter the motor cover 20. This will be a form that will be effectively prevented.

(4) Regarding the discharge portion of each discharge hole, in the embodiment described above, each discharge hole is formed in such a manner that the discharge portion of each discharge hole is provided individually (dedicated to each discharge portion). However, in the present invention, each discharge hole is not limited to having its own dedicated discharge part, but may be formed so that the discharge part is common to the discharge part of the other discharge hole. It's okay to have one.

Specifically, the configuration shown in FIG. 9 can be considered as an example. The configuration shown in FIG. 9 includes a first hole 61 and a fourth hole 71 that constitute an inflow section in each discharge hole (first discharge hole 60, second discharge hole 70), and a fourth hole that constitutes a communication section. The second hole 62 and the fifth hole 72 are formed to be the same as the corresponding holes in the previous embodiment. However, in this example, the closing members provided in the second hole 62 and the fifth hole 72 are provided closer to the opening side than the part where the second hole 62 and the fifth hole 72 intersect (intersection part). It is being Therefore, in this example, the communication portion of each discharge hole is configured to include the intersection portion.

In addition, a seventh hole 80 is formed in the frame, extending from a corner portion (corner portion) of the frame where the first surface 15 and the second surface 16 intersect toward the intersection. . This seventh hole 80 becomes a common discharge part for both discharge holes. That is, this seventh hole 80 is the first discharge part 80 in the first discharge hole 60 and becomes the second discharge part 80 in the second discharge hole 70. Note that, since the discharge portion 80 is formed from the corner portion as described above, it is opened to both the first surface 15 and the second surface 16.

(5) Regarding the communication part in each discharge hole, in the above embodiment, the second hole constituting the first communication part in the first discharge hole is open to the second surface 16 and has a closed end. It is formed so as to communicate with the closed end of the first hole (first inflow portion) 41 . However, the second hole for forming the first communication portion in the present invention is not limited to being formed in this way, and may be formed on the surface opposite to the second surface 16 (the exposed surface of the rotary table). It may be formed to be open.

Note that the positional relationship of the first discharge part with respect to the first inflow part needs to be as described above. Therefore, when the second hole is formed to open to the exposed surface of the rotary table, the second hole extends beyond the position of the first inflow part to the position of the first discharge part. , the closed end thereof is formed to communicate with the closed end of the first discharge section. The first inflow portion is located at a position closer to the exposed surface of the rotary table (the open end of the second hole) than the first discharge portion (the closed end of the second hole) in the lateral direction. , are in communication with the second hole. In addition, in the first discharge hole in which the second hole is formed, a closing member is provided in the second hole closer to the open end of the second hole than the first inflow portion. It will be done. In that case, a portion of the second hole closer to the first discharge portion than the closing member becomes the first communication portion.

Similarly, regarding the second communication part in the second discharge hole, the fifth hole constituting the second communication part is formed to open to the first surface 15 in the above embodiment. However, it may be formed so as to open on the surface opposite to the first surface 15. In that case, the fifth hole is formed so that its closed end communicates with the closed end of the second discharge section. Further, the second inflow portion communicates with the fifth hole on the side opposite to the first surface 15 from the second discharge portion (the closed end of the fifth hole) in the longitudinal direction. Moreover, also in the second discharge hole in which the fifth hole is formed in this way, the closing member is provided closer to the open end of the fifth hole than the second inflow portion of the fifth hole. . In that case, a portion of the fifth hole closer to the second discharge portion than the closing member becomes the second communication portion.

(6) Regarding the communication part of each discharge hole, in the example explained above, the communication part is configured as a part of a hole formed so as to open to the surface that becomes the bottom surface of the frame 10 in the other installed state. . However, in the present invention, the communication portion in each discharge hole is not limited to being configured as a part of the hole formed so as to open into the surface of the frame. Specifically, at the stage of manufacturing the frame (by casting, etc.), the frame is formed so that, for example, there is a hole-shaped space closed at both ends at the position of the communication portion of each discharge hole in the above embodiment. do. Then, by forming a hole that will become an inflow part from the motor mounting surface toward that space, and forming a hole that will become an outlet part from the bottom surface of the frame in one state, that space will become a communication part. becomes.

(7) Regarding the rotary table device to which the present invention is applied, in the embodiment described above, the rotary table device 1 is configured such that the drive motor 4 is located on the side of the main shaft 3 when the rotary table device 1 is placed vertically. However, the rotary table device to which the present invention is applied is not limited to such a configuration; for example, the rotary table device disclosed in Japanese Unexamined Patent Application Publication No. 2003-025170 is a rotary table device that is vertically placed above the main axis. A rotary table device configured to have a drive motor placed therein may be configured so that it can be installed horizontally.

Furthermore, in the example described above, the rotary table device is configured such that the output shaft of the drive motor is oriented parallel to the horizontal direction. However, the rotary table device to which the present invention is applied is not limited to such a configuration, and for example, the rotary table device that is configured in parallel to the vertical direction when placed vertically, such as the device disclosed in Japanese Patent Application Laid-Open No. 2006-110682. A rotary table device configured such that the output shaft of the drive motor is oriented in the direction of forming the rotation angle may be configured so that it can be installed even in a horizontal state.

Note that the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.

1 Rotary table device 2 Rotary table 3 Main shaft 4 Drive motor 4a Output shaft 10 Frame 11 Accommodation hole 12 Motor mounting surface 13 Through hole 14 Insertion hole 15 First surface 16 Second surface 20 Motor cover 30 Drive transmission mechanism 31 Worm gear mechanism 32 Worm wheel 33 Worm shaft 33a Worm 34 Gear train 40 First discharge hole 41 First hole (first inflow part)
42 Second hole 42a First communication part 43 Third hole (first discharge part)
44 First closing member 50 Second discharge hole 51 Fourth hole (second inflow part)
52 Fifth hole 52a Second communication section 53 Sixth hole (second discharge section)
54 Second closing member 60 First discharge hole 61 First hole (first inflow part)
62 Second hole 70 Second discharge hole 71 Fourth hole (second inflow part)
72 Fifth hole 80 Seventh hole (first discharge part, second discharge part)

Claims (1)

A rotary table device including a main shaft rotatably supported by a frame and a rotary table attached to an end of the main shaft, the rotary table device determining the angular position of the rotary table, the rotary table device being attached to the frame and driving the main shaft. a drive motor, and a motor cover attached to the frame to cover the drive motor; In a rotary table device configured to be usable in both a resting state and a resting state,
The surface that becomes the bottom surface of the frame when placed vertically is a first surface, and the surface that becomes the bottom surface of the frame when placed horizontally is a second surface,
A first discharge hole formed in the frame for discharging cutting oil in the motor cover, the first discharge hole being a discharge hole for the vertically placed state, and the first discharge hole for the horizontally placed state. a second discharge hole;
The first discharge hole is a first inflow portion that communicates with the space within the motor cover, and the first discharge hole is formed such that the communication position is a lower part of the space when the motor cover is placed vertically. an inflow section, a first discharge section that is open to the first surface and formed closer to the second surface than the first inflow section, and the first inflow section and the first discharge section. The first communication portion communicates with the
a second inflow part in which the second discharge hole is a second inflow part communicating with the space, the second inflow part being formed such that the communication position is at a lower part of the space in the horizontally placed state; a second discharge section that is open to a second surface and formed closer to the first surface than the second inflow section; and a second discharge section that communicates with the second inflow section. A rotary table device comprising a second communication section.

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