JP7353342B2 - round table device - Google Patents

Description

The present invention relates to a rotary table device, and more particularly to a rotary table device that includes a workpiece mounting portion at one axial end of a rotary shaft, rotates the rotary shaft with a drive mechanism, and fixes the rotary shaft at a predetermined angle with a clamp mechanism.

As a rotary table device for rotationally indexing a table on which a workpiece is attached, for example, the device described in Japanese Patent Laid-Open No. 2002-18679 (Patent Document 1) is known.

Patent Document 1 discloses a brake disc integrally provided on a rotating shaft, a clamp member that clamps the brake disc by applying pressure, a plurality of balls that directly press the clamp member, and a device for moving the balls. A rotary table device is disclosed having a hydraulic piston. In this rotary table device, the movable clamp member is pressurized by a ball moved by a hydraulic piston, thereby clamping and fixing the brake disc between the clamp members and stopping and holding the rotating shaft at a predetermined rotation angle.

Japanese Patent Application Publication No. 2002-18679

In the rotary table device of Patent Document 1, balls for pressing the movable clamp member are provided around the entire circumference of the rotating shaft. In order to increase the pressing force against the movable clamp member, it is better to use as many balls as possible. However, if there is no gap between adjacent balls over the entire circumference, the balls cannot move smoothly in the pressing direction or the non-pressing direction. Therefore, it is necessary to provide a gap between the balls arranged around the entire circumference. If a gap is provided between adjacent balls, each ball can move smoothly, but depending on the situation, adjacent balls may be densely packed in some areas and sparsely in some areas. For example, as shown in FIG. 7, when the rotary table device 100 is used in a vertical position with its rotating shaft 105 held in the horizontal direction, adjacent balls are closely spaced in the lower region due to the influence of gravity, and in the upper region In the region, adjacent balls are sparse.

In this case, if we focus on the fluid pressure piston that receives the reaction force from the balls, the reaction force from the balls will be large in areas where the balls are dense, and the reaction force from the balls will be large in areas where the balls are sparse. The force becomes smaller. Therefore, there is a possibility that the fluid pressure piston is tilted with respect to the axial direction. Also, if you pay attention to the movable side clamp member, the area where the balls are densely packed will receive a large pressure force, and the area where the balls are sparse will receive a relatively small pressure force, and the movable side clamp member may tilt with respect to the axial direction.

If a clamping operation is performed with the hydraulic piston or the movable clamp member tilted, the pressing force acting on the brake disc via the movable clamp member will be non-uniform in the circumferential direction, making it impossible to perform a stable clamping operation. Therefore, the determined position may move by a small amount. Additionally, if the fluid pressure piston or the movable clamp member is tilted and hardened and cannot move in the axial direction, the movable clamp member cannot be returned to its original position by the biasing force of the spring, making it impossible to achieve an unclamped state. It disappears.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a rotary table device that can realize a reliable and stable clamping operation.

For this purpose, a rotary table device according to one aspect of the present invention includes a workpiece mounting portion at one end of the rotary shaft in the axial direction, rotates the rotary shaft with a drive mechanism, and fixes the rotary shaft at a predetermined angle with a clamp mechanism. In the table device, the clamp mechanism includes a brake disc that is fixed to the rotating shaft and rotates together with the rotating shaft, a fixed clamp member and a movable clamp member that clamp and fix the brake disc from both sides in the axial direction, and an outer diameter surface and an inner diameter surface. a fluid pressure piston that is movable along the axial direction; a cylinder forming member that is located on the outer diameter side of the fluid pressure piston and guides the axial movement of the fluid pressure piston; A cylinder cover that is located on the surface side and guides the axial movement of the hydraulic piston, and a cylinder cover that is interposed between the hydraulic piston, the movable clamp member, and the cylinder forming member, and is movable in the axial and radial directions. The rotary table device includes a force increasing mechanism consisting of a ball and a cam surface in contact with the ball, and a biasing member that biases the movable clamp member toward the unclamping side away from the brake disc, and a force increasing mechanism that contacts the inner diameter surface of the hydraulic piston. A piston inclination suppressing means is provided on the adjacent cylinder cover and suppresses inclination of the hydraulic piston to promote movement in the axial direction.

Preferably, the piston inclination suppressing means is provided in a region closer to the brake disc than a location where an extended surface of the cam surface of the cylinder forming member that contacts the ball intersects with an outer diameter surface of the cylinder cover.

Preferably, the piston inclination suppressing means is a ring with a low coefficient of friction fitted to the outer diameter surface of the cylinder forming member.

Preferably, the piston tilt suppressing means is a plurality of point contact convex portions provided at equal angles in the circumferential direction on the outer diameter surface of the cylinder cover.

Preferably, the point contact convex portion is the tip of a ball screw that screws the thick portion of the cylinder cover into the through hole.

Preferably, three point contact convex portions are provided at equal intervals in the circumferential direction.

When the rotary table device is placed vertically with its rotation axis held in the horizontal direction, preferably two of the three point contact convex portions are in a horizontal positional relationship at a lower position.

A rotary table device according to another aspect of the present invention is a rotary table device that includes a workpiece mounting portion at one axial end of a rotary shaft, rotates the rotary shaft with a drive mechanism, and fixes the rotary shaft at a predetermined angle with a clamp mechanism. The clamp mechanism has a brake disc that is fixed to the rotating shaft and rotates together with the rotating shaft, a fixed clamp member and a movable clamp member that clamp and fix the brake disc from both sides in the axial direction, and an outer diameter surface and an inner diameter surface. , a fluid pressure piston movable along the axial direction; a cylinder forming member located on the outer diameter side of the fluid pressure piston and guiding the movement of the fluid pressure piston in the axial direction; and a cylinder forming member located on the inner diameter side of the fluid pressure piston. A cylinder cover is positioned between the hydraulic piston, the movable clamp member, and the cylinder forming member, and is movable in the axial and radial directions. The rotary table device includes a force increasing mechanism consisting of a cam surface in contact with the ball, and a biasing member that biases the movable clamp member toward the unclamping side away from the brake disc, and a biasing member that biases the movable clamp member toward the unclamp side away from the brake disc. and clamp member tilt suppressing means for promoting movement in the direction.

Preferably, the clamp member tilt suppressing means is fixed to an axial hole provided in the movable clamp member and a fixed portion on one or the other axial side of the movable clamp member, and is movable relative to the axial hole. and a fixing pin to be inserted.

Preferably, the clamp member tilt suppressing means includes a sliding bearing provided between the axial hole and the fixing pin.

According to the present invention, since the inclination of the hydraulic piston or the movable clamp member is suppressed, smooth clamping operation can be performed.

1 is a longitudinal cross-sectional view showing a rotary table device according to Embodiment 1 of the present invention. 2 is an enlarged view of a portion of FIG. 1. FIG. 3 is an enlarged view of a portion of FIG. 2. FIG. FIG. 3 is a schematic cross-sectional view showing the movable clamp member taken out. FIG. 3 is a longitudinal sectional view corresponding to FIG. 2 and showing a rotary table device according to a second embodiment of the present invention. (A) is a schematic cross-sectional view showing the cylinder cover taken out, and (B) is an enlarged view of a ball screw as an example of a piston inclination suppressing means. FIG. 2 is a schematic diagram showing a state in which a conventional rotary table device is placed vertically.

Embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same reference numerals are attached to the same or corresponding parts in the drawings, and the description thereof will not be repeated.

<Embodiment 1>
FIG. 1 is a longitudinal sectional view of a rotary table device 1 according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion thereof. The configuration of the rotary table device 1 will be described with reference to FIGS. 1 and 2.

A rotary shaft 5 is rotatably supported within the device main body 2 via a cross roller bearing 3 and a needle bearing 4, and one end of the rotary shaft 5 in the axial direction projects outward from the device. A table surface 6 is formed as a work mounting portion. The rotating shaft 5 is rotatable around an axis O.

A worm wheel 8 is fixed to a portion of the rotating shaft 5 between the bearings 3 and 4 by a bolt 7, and the worm wheel 8 meshes with a driving worm shaft 9. Although not shown, the driving worm shaft 9 is an electric motor. It is connected to a rotary actuator or manual handle. The space in which the worm wheel 8 and the worm shaft 9 are housed is an oil bath, and the worm wheel 8 and the worm shaft 9 are driven within the oil bath. The worm wheel 8 is made of a hardened material, and the worm shaft 9 is made of a hard material such as carbide.

The clamp mechanism that stops and holds the rotating shaft 5 at a predetermined rotational position includes a brake disc 10 that rotates together with the rotating shaft 5, a pair of clamp members 20 and 21 that clamp and fix the brake disc 10 from both sides in the axial direction, and one It is composed of a fluid pressure piston (pneumatic piston) 30 that presses (presses) the clamp member (movable side clamp member) 21 in the axial direction, and a force increasing mechanism using a ball 40 and cam surfaces 22, 32, 52, etc. There is.

The brake disc 10 is held between a pair of mounting rings 16 and fixed to the worm wheel 8 with bolts 17. Among the pair of clamp members 20 and 21, one clamp member 20 is formed integrally with the device main body 2 and is a fixed side clamp member that cannot be moved in the axial direction, and the other clamp member 21 is formed integrally with the device main body 2. The movable clamp member is movable in the axial direction along the inner circumferential surface of 2.

A shaft portion of a bolt 23 passes through the movable clamp member 21 so as to be relatively movable. The tip of the shaft portion of the bolt 23 is fixed to a cylinder forming member 50, which will be described later. A biasing member 24 is provided between the head of the bolt 23 and the upper surface of the movable clamp member 21 . The biasing member 24 biases the movable clamp member 21 toward the unclamping side (arrow A2 side) away from the brake disc 10. It is preferable that the biasing member 24 is, for example, a coil spring, a leaf spring, or the like. The movable clamp member 21 is provided with a clamp member tilt suppressing means 70 that suppresses the tilt of the movable clamp member 21 and promotes movement in the axial direction. This clamp member inclination suppressing means 70 will be described later.

An annular piston chamber (cylinder) having an L-shaped cross section is formed by the cylinder forming member 50 and the cylinder cover 60 on the side of the arrow A2 with respect to the movable clamp member 21 . As shown in FIG. 2, a hydraulic piston 30 having an outer diameter surface and an inner diameter surface is housed in a piston chamber so as to be movable along the axial direction. The piston chamber includes a seal ring 38a attached to the outer diameter surface of the vertical wall portion 62 of the cylinder cover 60, a seal ring 38b attached to the outer diameter surface of the hydraulic piston 30, and a seal ring 38b attached to the inner diameter surface of the cylinder forming member 50. It is sealed by a sealed seal ring 38c. The cylinder forming member 50 and the cylinder cover 60 are fixed to the device main body 2 with bolts 18.

The cylinder forming member 50 is located on the outer diameter side of the hydraulic piston 30 and guides the movement of the hydraulic piston 30 in the axial direction. The cylinder cover 60 is located on the inner diameter side of the hydraulic piston 30 and guides the movement of the hydraulic piston 30 in the axial direction. Specifically, the cylinder cover 60 has an L-shaped cross section in the partial cross-sectional view shown in FIG. . A piston tilt suppressing means 80 is provided on the outer diameter side of the vertical wall portion 62 of the cylinder cover 60 to suppress the tilt of the hydraulic piston 30 and promote movement in the axial direction. This piston inclination suppressing means 80 will be described later.

Inside the piston chamber, there is a clamping air chamber 33 for moving the fluid pressure piston 30 to the clamping side (arrow A1 side), and an unclamping air chamber 33 for moving the fluid pressure piston 30 to the unclamping side (arrow A2 side). An air chamber 34 is formed, and both air chambers 33 and 34 are switchably communicated with an air supply source and an air discharge section via air passages 35 and 36, respectively, and an air switching valve (not shown).

The force increasing mechanism basically has almost the same configuration as the force increasing mechanism described in JP-A No. 2002-18679. That is, when the fluid pressure piston 30 moves toward the clamp side (arrow A1 side), the cam surface (slanted surface) 32 of the fluid pressure piston 30 presses the ball 40. The ball 40 pushed thereby moves radially outward and axially along the cam surface 52 of the cylinder forming member 50. The space formed by the cam surfaces 22 and 52 with which the ball 40 comes into contact is a tapered space whose distance gradually decreases as it goes radially outward. As a result, when the ball 40 moves radially outward, the movable clamp member 21 is pressed by the ball 40 and moves toward the clamp side (arrow A1 side) to clamp and fix the brake disc 10.

(About clamp member tilt suppression means)
FIG. 3 is an enlarged vertical cross-sectional view of the movable clamp member 21, and FIG. 4 is a schematic cross-sectional view of the movable clamp member 21 taken out. The clamp member tilt suppressing means 70 provided on the movable clamp member 21 will be described with reference to these figures.

As described above, the clamp member inclination suppressing means 70 suppresses the inclination of the movable clamp member 21 and promotes movement in the axial direction. Specifically, the clamp member inclination suppressing means 70 includes an axial hole 71 provided in the movable clamp member 21 , a fixing pin 72 inserted into the axial hole 71 so as to be relatively movable, and an axial hole 71 provided in the movable clamp member 21 . and a sliding bearing 73 attached to the.

The axial hole 71 in this embodiment is a through hole that penetrates in the axial direction, but may be a blind hole that opens toward the cylinder forming member 50 side and does not penetrate. The fixing pin 72 is a rod-shaped member that extends in the axial direction. The fixing pin 72 of this embodiment has its lower side fixed to the cylinder forming member 50, and its upper side is provided so as to be relatively movable within the axial hole 71. The sliding bearing 73 is, for example, a tin-plated steel bush or a fluororesin bearing.

Note that although the sliding bearing 73 is attached to the axial hole 71 in this embodiment, in another embodiment, the fixing pin 72 itself directly slides into contact with the hole wall surface of the axial hole 71. Good too. Further, the fixing pin 72 may have its upper side fixed to, for example, the device main body 2.

By providing the axial hole 71 and the fixing pin 72, it is possible to prevent the movable clamp member 21 from tilting when the movable clamp member 21 moves in the axial direction. Furthermore, if a sliding bearing 73 is provided in the axial hole 71 or the surface of the fixed pin 72 is treated to exhibit good sliding properties, the movable clamp member 21 can be moved while suppressing the inclination of the movable clamp member 21. Since it can be guided smoothly in the axial direction, reliable clamping and unclamping operations can be achieved.

As shown in FIG. 4, for example, three clamp member inclination suppressing means 70 each including an axial hole 71 and a fixing pin 72 are provided at equal intervals in the circumferential direction. When the table surface 6 of the rotary table device 1 is used in an upright state rather than horizontally, two of the three clamp member tilt suppressing means 70a to 70c (clamp member tilt suppressing means 70b and 70c) are By arranging them in a horizontal positional relationship, the axial movement of the movable clamp member 21 can be guided more smoothly. Although there is no restriction on the number of clamp member inclination suppressing means 70, it is preferable to provide at least two or more places.

(About piston tilt suppression means)
As shown in FIGS. 1 and 2, the piston inclination suppressing means 80 is provided on the cylinder cover 60 that comes into contact with the inner diameter surface of the hydraulic piston 30. As described above, the piston inclination suppressing means 80 suppresses the inclination of the hydraulic piston 30 and promotes movement in the axial direction. Specifically, the piston tilt suppressing means 80 is a ring with a low coefficient of friction that is fitted on the outer diameter surface of the cylinder cover 60. The material of this ring 80 is, for example, a metal with good slipperiness, a fluororesin, or the like. The ring 80 may have a cut (cut) at one location on the circumference to facilitate attachment to the cylinder cover 60.

As shown in FIG. 2, the attachment points of the ring as the piston inclination suppressing means 80 are the extension surface of the cam surface (guide surface) 52 of the cylinder forming member 50 that is in contact with the ball 40, and the outer diameter surface of the cylinder cover 60. It is preferable to provide it in a region R closer to the brake disc 10 than where the two intersect. In other words, it is preferable that the ring 80 be provided in a region that receives the reaction force from the ball 40. Further, the ring 80 is located in an area closer to the brake disc 10 than the seal ring (O-ring) 38a attached to the outer diameter surface of the cylinder cover 60.

The outer diameter of the ring 80 is slightly larger than the outer diameter of the cylinder cover 60. Therefore, the inner diameter surface of the fluid pressure piston 30 is reliably guided in the axial direction by the outer diameter surface of the ring 80, and it is possible to suppress the fluid pressure piston 30 from tilting in the axial direction. In this way, the clamping operation by moving the fluid pressure piston 30 in the axial direction can be performed smoothly.

(About the operation of the rotary table device)
Next, the operation of the rotary table device 1 according to this embodiment will be explained.

FIG. 1 shows an unclamped state, in which the clamping members 20 and 21 are released from clamping the brake disc 10. By rotating the drive worm shaft 9 in this state, the rotation shaft 5 is rotated via the worm wheel 8, thereby changing the rotation angle of the workpiece on the table surface 6.

When the rotating shaft 5 is to be clamped after rotation by a predetermined angle, the fluid pressure piston 30 is moved to the clamping side (arrow A1 direction). Accordingly, the piston inclination suppressing means (ring) 80 located on the outer diameter surface of the cylinder cover 60 suppresses the inclination of the hydraulic piston 30 and promotes movement in the axial direction.

In FIG. 2, as the fluid pressure piston 30 moves in the direction of arrow A1, the ball 40 is pushed by the tapered cam surface 32 of the fluid pressure piston 30 and moves radially outward along the cam surface 52 of the cylinder forming member 50. and move in the axial direction of arrow A1. Accordingly, the movable clamp member 21 moves in the direction of arrow A1. Since the distance between the cam surface 52 of the cylinder forming member 50 and the lower surface (cam surface) 22 of the movable clamp member 21 becomes smaller toward the outer diameter side, the movement of the ball 40 radially outward , the pressing force on the movable clamp member 21 increases, and the brake disc 10 is securely clamped and fixed. During this clamping operation, the piston inclination suppressing means 80 suppresses the inclination of the hydraulic piston 30, and the clamp member inclination suppressing means 70 suppresses the inclination of the movable clamp member 21, so that a reliable and stable clamping operation can be realized. .

When unclamping the rotating shaft 5, the fluid pressure piston 30 is moved in the direction of arrow A2 by pressurizing air into the unclamping air chamber 34 in FIG. 2 and discharging air from the clamping air chamber 33. . As the fluid pressure piston 30 retreats, the ball 40 moves toward the rotation axis and releases the pressing force against the movable clamp member 21.

As shown in FIG. 1, the movable clamp member 21 is always pressed in the direction of arrow A2 (unclamping direction) by the biasing member 24. Therefore, when the pressing force via the ball 40 weakens, the biasing member 24 moves the movable clamp member 21 to the unclamping side and releases the clamping and fixing state with respect to the brake disc 10.

(About effects)
Since the rotary table device 1 of the present embodiment is provided with the piston inclination suppressing means 80 on the cylinder cover 60, the hydraulic piston 30 is suppressed from inclining with respect to the axial direction, thereby promoting movement in the axial direction. be able to. This makes it possible to equalize the pressing force exerted on each ball 40 from the fluid pressure piston 30 even if there are dense areas and sparse areas between adjacent balls 40 over the entire circumference.

Furthermore, since the rotary table device 1 of the present embodiment is provided with the clamp member tilt suppressing means 70, it is possible to suppress the movable clamp member 21 from tilting in the axial direction and promote the movement in the axial direction. can. This makes it possible to equalize the pressing force acting on the movable clamp member 21 from each ball 40 even if there are dense areas and sparse areas between adjacent balls 40 over the entire circumference.

As described above, in the rotary table device 1 of the present embodiment, by providing the clamp member inclination suppressing means 70 or the piston inclination suppressing means 80, the pressurizing force acting on the brake disc 10 becomes uniform in the circumferential direction and is reliable. It becomes possible to perform stable clamping operation.

Furthermore, since the movable clamp member 21 is prevented from tilting and is reliably moved parallel to the axial direction, it is possible to prevent the movable clamp member 21 from tilting and solidifying. Thereby, the movable clamp member 21 can be reliably moved to the unclamping side by the urging force of the urging member 24, so that a stable unclamping operation can be realized.

<Embodiment 2>
5 is a vertical cross-sectional view showing the rotary table device according to the second embodiment, FIG. 6(A) is a schematic cross-sectional view showing the position of the piston tilt suppressing means 80, and FIG. ) is an enlarged view of a ball screw as an example of piston tilt suppressing means. A rotary table device according to a second embodiment will be described with reference to FIGS. 5 and 6. Embodiment 1 and Embodiment 2 differ in the specific structure of piston tilt suppressing means 80. Only the differences from the piston inclination suppressing means 80 shown in Embodiment 1 will be described in detail.

The piston inclination suppressing means 80A of this embodiment is a ball screw that penetrates the thick portion of the cylinder cover 60. In particular, as shown in FIG. 6(B), the ball screw 80A includes a shaft portion 81A and a spherical portion 82A provided on one side of the shaft portion 81A in the longitudinal direction.

The shaft portion 81A is a portion that is screwed and fixed into the cylinder cover 60, and has a male thread on its outer periphery. The spherical portion 82A is a point contact convex portion that protrudes outward from the outer diameter surface of the cylinder cover 60 and makes point contact with the inner diameter surface of the hydraulic piston 30. In this embodiment, the spherical portion 82A is fixed to the shaft portion 81A. As another embodiment, the spherical portion 82A may be rotatably provided with respect to the shaft portion 81A, and may roll on the inner diameter surface of the hydraulic piston 30 and come into contact with it. The spherical portion 82A of the ball screw 80A protrudes slightly toward the outer diameter side than the outer diameter surface of the cylinder cover 60. Preferably, the ball screw 80A penetrates the vertical wall portion 62 of the cylinder cover 60 in a direction perpendicular to the axial direction. Thereby, the amount of protrusion of the spherical portion 82A can be adjusted using a tool inserted into the square hole provided at the rear end of the ball screw 80A.

As shown in FIG. 6(A), it is preferable that three ball screws 80A are provided at equal intervals in the circumferential direction. Thereby, the centering of the fluid pressure piston 30 can be easily performed, and thereby the inclination of the fluid pressure piston 30 with respect to the axial direction can be suppressed. In the case of vertical placement in which the rotary shaft 5 of the rotary table device 1 is held in the horizontal direction, two of the three ball screws 80A are in a horizontal positional relationship at a lower position. Thereby, the axial movement of the hydraulic piston 30 can be guided more smoothly.

In addition, in Embodiment 1, although the structure which provided both the clamp member inclination suppression means 70 and the piston inclination suppression means 80 was shown, each means 70 and 80 may be provided independently. Further, the clamp member tilt suppressing means 70 of the first embodiment and the piston tilt suppressing means 80A of the second embodiment may be combined.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope.

The present invention is advantageously utilized in machine tools.

1 rotary table device, 2 device main body, 5 rotating shaft, 6 table surface (work attachment part), 10 brake disc, 20 fixed side clamp member, 21 movable side clamp member, 22 cam surface, 24 urging member, 30 fluid pressure Piston; 32 Cam surface; 40 Ball; , 80A piston inclination suppressing means (ball screw), 82A spherical part (point contact convex part), 100 rotary table device, 105 rotating shaft.

Claims (10)

A rotary table device including a workpiece mounting portion at one axial end of a rotating shaft, rotating the rotating shaft by a drive mechanism, and fixing the rotating shaft at a predetermined angle by a clamp mechanism,
The clamp mechanism includes:
a brake disc fixed to the rotating shaft and rotating together with the rotating shaft;
a fixed side clamp member and a movable side clamp member that clamp and fix the brake disc from both sides in the axial direction;
a hydraulic piston having an outer diameter surface and an inner diameter surface and movable along the axial direction;
a cylinder forming member located on the outer diameter side of the fluid pressure piston and guiding movement of the fluid pressure piston in the axial direction;
a cylinder cover located on the inner diameter side of the fluid pressure piston and guiding movement of the fluid pressure piston in the axial direction;
A force increasing mechanism is provided between the fluid pressure piston, the movable clamp member, and the cylinder forming member, and includes a ball movable in the axial and radial directions and a cam surface in contact with the ball,
The rotary table device is
a biasing member that biases the movable clamp member toward an unclamping side away from the brake disc;
A rotary table device comprising: a piston inclination suppressing means provided on the cylinder cover that abuts an inner diameter surface of the hydraulic piston, suppressing inclination of the hydraulic piston and promoting movement in an axial direction. 1 . The piston inclination suppressing means is provided in an area closer to the brake disc than a location where an extended surface of the cam surface of the cylinder forming member that contacts the ball intersects with an outer diameter surface of the cylinder cover. The rotary table device described in . The piston tilt suppressing means is a ring made of a metal or fluororesin with good sliding properties and fitted on the outer diameter surface of the cylinder forming member,
The rotary table device according to claim 1 or 2, wherein the outer diameter dimension is slightly larger than the outer diameter dimension of the cylinder cover . 3. The rotary table device according to claim 1, wherein the piston tilt suppressing means is a plurality of point contact convex portions provided at equal angles in the circumferential direction on the outer diameter surface of the cylinder cover. 5. The rotary table device according to claim 4, wherein the point contact convex portion is a tip of a ball screw passing through a thick portion of the cylinder cover. The rotary table device according to claim 5, wherein three point contact convex portions are provided at equal intervals in the circumferential direction. The rotary table device has the rotating shaft held in a horizontal direction,
The rotary table device according to claim 6, wherein two of the three point contact convex portions are in a horizontal positional relationship at a lower position. A rotary table device including a workpiece mounting portion at one axial end of a rotating shaft, rotating the rotating shaft by a drive mechanism, and fixing the rotating shaft at a predetermined angle by a clamp mechanism,
The clamp mechanism includes:
a brake disc fixed to the rotating shaft and rotating together with the rotating shaft;
a fixed side clamp member and a movable side clamp member that clamp and fix the brake disc from both sides in the axial direction;
a hydraulic piston having an outer diameter surface and an inner diameter surface and movable along the axial direction;
a cylinder forming member located on the outer diameter side of the fluid pressure piston and guiding movement of the fluid pressure piston in the axial direction;
a cylinder cover located on the inner diameter side of the fluid pressure piston and guiding movement of the fluid pressure piston in the axial direction;
A force increasing mechanism is provided between the fluid pressure piston, the movable clamp member, and the cylinder forming member, and includes a ball movable in the axial and radial directions and a cam surface in contact with the ball,
The rotary table device is
a biasing member that biases the movable clamp member toward an unclamping side away from the brake disc;
A rotary table device comprising: a clamp member inclination suppressing means that passes through the movable clamp member in the axial direction and suppresses inclination of the movable clamp member to promote movement in the axial direction. The clamp member inclination suppressing means includes an axial hole provided in the movable clamp member;
The rotary table device according to claim 8, further comprising a fixing pin fixed to a fixed portion on one or the other axial side of the movable clamp member and inserted into the axial hole so as to be relatively movable. The rotary table device according to claim 9, wherein the clamp member tilt suppressing means includes a sliding bearing provided between the axial hole and the fixing pin.

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