JP2024067886A - Pressure fluid supply and discharge device and fluid pressure clamp unit - Google Patents

Abstract

A tool for transmitting a rotational force is smoothly fitted into a cap member that transmits a rotational force to a male screw member for moving a piston member to supply and discharge a working fluid. [Solution] The hydraulic supply device (4) includes a piston member (5) inserted into a housing (10) so as to be movable in the axial direction, a female screw member (6) provided in a receiving hole (11) formed in the piston member (5) in the axial direction, a male screw member (7) screwed into the female screw member (6), a cap member (8) fitted to the end opposite the male screw-formed end of the male screw member (7) so as to be slidable in the axial direction and fitted to the male screw member (7) so as to be capable of transmitting a rotational force around the axis of the male screw member, a working chamber (9) formed on the cap member (8) side of the piston member (5) or on the opposite side to the cap member (8) and into which hydraulic oil (23) is supplied and discharged by the movement of the piston member (5), and a pressing mechanism which presses the cap member (8) in the axial direction [Selected drawing] FIG. 3

Description

The present invention relates to a pressure fluid supply and discharge device that supplies pressure fluid to a clamping device and a fluid pressure clamping unit.

A clamping device that switches between a locked state and a released state by supplying and discharging hydraulic oil to and from an operating chamber to secure a workpiece is known as prior art (Patent Document 1).

Such a clamping device, together with a hydraulic supply device that supplies and discharges hydraulic oil, can be mounted on a conveying member configured to be movable along a track and used as a clamping unit.

International Publication No. 2018/186136 Brochure

The hydraulic supply device as described above includes a piston member inserted into the housing so as to be movable in the axial direction, a female screw member provided on the piston member, a male screw member that screws into the female screw member, and a cap member that fits into the male screw member so as to transmit a rotational force around the axis to the male screw member. The piston member moves based on the rotational force that acts on the cap member from a tool and is transmitted to the male screw member, and hydraulic oil is supplied and discharged from the working chamber adjacent to the piston member. In order to transmit a rotational force to such a cap member, it is necessary to fit a tool for transmitting the rotational force into the cap member.

However, it was difficult to smoothly fit the tool for transmitting the rotational force into the cap member while aligning the phase.

One aspect of the present invention aims to provide a pressurized fluid supply/discharge device and a fluid pressure clamp unit that can smoothly fit a tool for transmitting a rotational force to a cap member that transmits a rotational force to a male thread member that moves a piston member to supply and discharge a working fluid.

In order to solve the above problems, a pressurized fluid supply and discharge device according to one aspect of the present invention is characterized in that it comprises a piston member inserted axially movably into a housing, a female screw member provided in a receiving hole formed in the piston member in the axial direction, a male screw member that screws into the female screw member, a cap member that fits slidably in the axial direction on the opposite end of the male screw member to the male screw end and that fits so as to transmit a rotational force around the axis to the male screw member, a working chamber that is formed on the cap member side of the piston member or on the opposite side to the cap member and into which working fluid is supplied and discharged by the movement of the piston member, and a pressing mechanism that presses the cap member in the axial direction.

According to this feature, the cap member is fitted to the end opposite the male threaded end of the male threaded member so as to be able to transmit a rotational force around the axis to the male threaded member, and is fitted so as to be slidable in the axial direction. A pressing mechanism is provided to press the cap member in the axial direction. Therefore, even if the rotational force transmission tool for transmitting the rotational force to the cap member shifts horizontally during the process of fitting the tool into the cap member, causing the tip of the rotational force transmission tool to come into contact with and press the cap member, the cap member is pressed by the pressing mechanism and slides. Therefore, defects such as damage to the cap member and related members can be avoided.

In one aspect of the present invention, the pressure fluid supply/discharge device is preferably such that the cap member has a fitting hole that fits with the male screw member and a guide groove that extends in the axial direction on the inner wall of the fitting hole, and the male screw member has a pin member that engages with the guide groove.

According to the above configuration, the guide groove extending in the axial direction on the inner wall of the fitting hole and the pin member engaging with the guide groove can transmit a rotational force around the axis from the cap member to the male screw member.

In one aspect of the present invention, the pressurized fluid supply/discharge device preferably has an operating portion at the tip opposite the male screw member for receiving a rotational force around the axis.

According to the above configuration, the cap member can receive a rotational force from the outside by using an operating part for receiving a rotational force around the axis, which is provided at the tip of the cap member opposite the male screw member.

In one aspect of the pressure fluid supply/discharge device of the present invention, it is preferable that the operating portion has a polygonal convex portion protruding in the axial direction or a polygonal concave portion recessed in the axial direction.

According to the above configuration, by fitting a tool having a polygonal recess recessed in the axial direction or a polygonal protrusion protruding in the axial direction into the cap member, a rotational force can be easily transmitted to the cap member.

In one aspect of the pressurized fluid supply/discharge device of the present invention, the housing preferably has a receiving portion for preventing the cap member from falling off due to the fluid pressure of the working fluid, and the cap member preferably has a stopper portion that can engage with the receiving portion.

The above configuration makes it possible to prevent the cap member, which is pressed axially by the pressing mechanism, from falling off the housing.

In one aspect of the present invention, the pressure fluid supply/discharge device is preferably such that the cap member has a fitting hole that fits with the male screw member and a guide groove extending in the axial direction on the inner wall of the fitting hole, and the male screw member has a guide hole formed along the radial direction corresponding to the guide groove, a ball member provided in the guide hole facing the guide groove, and an elastic member provided to bias the ball member toward the guide groove.

The above configuration reduces wear and damage to the engagement portion between the cap member and the male thread member, even if an external torque greater than a predetermined torque acts on the cap member.

It is preferable that the pressurized fluid supply/discharge device according to one aspect of the present invention further includes a working fluid passage for supplying the working fluid discharged from the working chamber to the clamp device and for supplying the working fluid discharged from the clamp device to the working chamber.

According to the above configuration, the working fluid can be supplied from the pressure fluid supply/discharge device to the clamp device through the working fluid passage, and the working fluid can be discharged from the clamp device to the pressure fluid supply/discharge device through the working fluid passage.

In one aspect of the pressurized fluid supply/discharge device of the present invention, the working chamber is preferably formed on the cap member side of the piston member, and the pressing mechanism preferably contains a working fluid that is supplied to and discharged from the working chamber by the movement of the piston member.

According to the above configuration, the cap member is pressed in the axial direction by the working fluid supplied to and discharged from the working chamber formed on the cap member side of the piston member.

In one aspect of the present invention, the pressurized fluid supply/discharge device is preferably such that the working chamber is formed on the piston member on the opposite side to the cap member, and the pressing mechanism includes an elastic member that presses the cap member in the axial direction.

According to the above configuration, the cap member is pressed in the axial direction by the elastic member.

In one aspect of the present invention, the pressurized fluid supply/discharge device is preferably configured such that the cap member slides toward the piston member in response to a decrease in the fluid pressure of the working fluid.

With the above configuration, when a malfunction occurs that reduces the fluid pressure of the working fluid, the cap member, which would normally be raised, descends, making it easier to discover malfunctions in the pressurized fluid supply/discharge device.

To solve the above problem, a fluid pressure clamp unit according to one aspect of the present invention is characterized by comprising a conveying member configured to be movable along a track, a pressure fluid supply/discharge device according to one aspect of the present invention provided on the conveying member, and a clamp device provided on the conveying member to receive the working fluid from the pressure fluid supply/discharge device and discharge the working fluid to the pressure fluid supply/discharge device.

According to this feature, the working fluid is supplied from the pressure fluid supply/discharge device, and the cap member of the pressure fluid supply/discharge device on the conveying member provided with a clamp device for discharging the working fluid to the pressure fluid supply/discharge device is fitted to the opposite end of the male threaded end of the male threaded member so as to be able to transmit a rotational force around the axis to the male threaded member, and is fitted so as to be slidable in the axial direction. A pressing mechanism is provided to press the cap member in the axial direction. Therefore, even if the rotational force transmission tool for transmitting the rotational force to the cap member is displaced in the horizontal direction during the process of fitting into the cap member, and the tip of the rotational force transmission tool comes into contact with and presses the cap member, the cap member is pressed by the pressing mechanism and slides. Therefore, defects such as damage to the cap member and related members can be avoided.

In one aspect of the present invention, the clamping device of the fluid pressure clamping unit preferably includes a pair of pivoting clamps.

According to the above configuration, the pair of rotating clamps can be operated by the fluid pressure of the working fluid supplied from or discharged to the pressure fluid supply/discharge device to lock or release the workpiece.

In one aspect of the fluid pressure clamp unit of the present invention, the pressure fluid supply/discharge device preferably supplies the working fluid to the clamp device when the clamp device is released from a locked state to a released state.

According to the above configuration, the clamp device can be released from the locked state to the released state by the hydraulic fluid supplied from the pressure fluid supply/discharge device.

In one aspect of the fluid pressure clamp unit of the present invention, the pressure fluid supply/discharge device preferably supplies the working fluid to the clamp device when the clamp device is locked from a released state to a locked state.

According to the above configuration, the clamp device can be locked from the released state to the locked state by the hydraulic fluid supplied from the pressure fluid supply/discharge device.

According to one aspect of the present invention, a tool for transmitting a rotational force can be smoothly fitted to a cap member that transmits a rotational force to a male thread member for moving a piston member to supply and discharge a working fluid.

FIG. 2 is a plan view of the hydraulic clamp unit according to the first embodiment. FIG. 2 is a side view of the hydraulic clamp unit. FIG. 2 is a cross-sectional view of a hydraulic pressure supply device and a swivel clamp provided in the hydraulic clamp unit. 13 is a plan view showing a modified example of an operating portion of a cap member provided in the hydraulic pressure supply device. FIG. 5 is a cross-sectional view showing the operation of the hydraulic supply device and the rotary clamp. FIG. 5 is a cross-sectional view showing the operation of the hydraulic pressure supply device. FIG. FIG. 11 is a cross-sectional view of a hydraulic supply device and a swivel clamp according to a second embodiment. 5 is a cross-sectional view showing the operation of the hydraulic supply device and the rotary clamp. FIG. FIG. 11 is a cross-sectional view of a hydraulic supply device and a swivel clamp according to a third embodiment. 5 is a cross-sectional view showing the operation of the hydraulic supply device and the rotary clamp. FIG. FIG. 10 is a cross-sectional view of a main part of a hydraulic pressure supply device according to a fourth embodiment. FIG. 4 is a cross-sectional view of another main part of the hydraulic pressure supply device. FIG. 4 is a cross-sectional view of still another main part of the hydraulic pressure supply device. FIG. 4 is a cross-sectional view of still another main part of the hydraulic pressure supply device.

[Embodiment 1]
An embodiment of the present invention will be described in detail below. Fig. 1 is a plan view of a hydraulic clamp unit 1 (fluid pressure clamp unit) according to embodiment 1. Fig. 2 is a side view of the hydraulic clamp unit 1.

The hydraulic clamp unit 1 comprises a conveying member 2 configured to be movable along a track, a hydraulic supply device 4 (pressure fluid supply/discharge device) provided on the conveying member 2, and a pair of swivel clamps 3 (clamp devices) provided on the conveying member 2 so that hydraulic oil is supplied from the hydraulic supply device 4 and the hydraulic oil is discharged to the hydraulic supply device 4.

The swivel clamps 3 are provided to hold down the workpiece W from above and secure it on the transport member 2. Between the pair of swivel clamps 3, a support device 22 is provided to support the workpiece W from below.

The hydraulic clamp unit 1 is used, for example, in a processing machine, where an operator operates the swivel clamp 3 to fix the workpiece W on the transport member 2, closes the door of the processing machine and processes the workpiece W with the processing machine while the operator is away. After that, the door is opened again and the operator operates the swivel clamp 3 to release the workpiece W from the transport member 2.

The hydraulic clamp unit 1 may also be used, for example, such that an operator operates the swivel clamp 3 outside the processing machine to fix the workpiece W on the transport member 2, and then the hydraulic clamp unit 1 is transported into the processing machine installed in a different location. The workpiece W may then be processed by the processing machine, and when the hydraulic clamp unit 1 returns from the processing machine, the operator may release the workpiece W from the transport member 2.

Figure 3 is a cross-sectional view of the hydraulic supply device 4 and the swivel clamp 3 provided in the hydraulic clamp unit 1. Components similar to those previously described are given the same reference numerals. Detailed descriptions of these components will not be repeated.

The hydraulic supply device 4 includes a piston member 5 inserted axially movably into a substantially cylindrical housing 10, a female screw member 6 provided in a receiving hole 11 formed in the piston member 5 in the axial direction, a male screw member 7 screwed into the female screw member 6, a cap member 8 axially slidably fitted to the opposite end of the male screw member 7 from the male screw end and fitted to transmit a rotational force around the axis to the male screw member 7, a working chamber 9 formed on the cap member 8 side of the piston member 5 and into which hydraulic oil 23 is supplied and discharged by the movement of the piston member 5, and a pressing mechanism that presses the cap member 8 in the axial direction. This pressing mechanism contains the hydraulic oil 23 supplied to and discharged from the working chamber 9 by the movement of the piston member 5.

The cap member 8 has a fitting hole 13 that fits with the male screw member 7, and a guide groove 14 that extends in the axial direction on the inner wall of the fitting hole 13. The male screw member 7 has a pin member 12 that engages with the guide groove 14.

The cap member 8 has an operating part 15 at the tip opposite the male screw member 7 for receiving rotational force around the axis.

The operation portion 15 has a polygonal protrusion protruding in the axial direction. The operation portion 15 may have a polygonal recess. In the present embodiment, an example in which the operation portion 15 has a hexagonal protrusion is illustrated as shown in FIG. 1.
FIG. 4 is a plan view showing a modified example of the operating portion 15 of the cap member 8 provided in the hydraulic supply device 4. As shown in FIG.

The operating unit 15 is not limited to a hexagonal convex or concave portion. For example, as shown in FIG. 4, the operating unit 15 may have a 24-sided concave portion 29 formed by overlapping two hexagonal holes with the holes shifted by 30 degrees around the axis.

The housing 10 has a receiving portion 20 to prevent the cap member 8 from falling off due to the hydraulic pressure (fluid pressure) of the hydraulic oil 23 (working fluid). The cap member 8 has a stopper portion 16 that can engage with the receiving portion 20.

The hydraulic supply device 4 further includes a hydraulic oil passage 21 (hydraulic fluid passage) for supplying hydraulic oil 23 discharged from the working chamber 9 to the swivel clamp 3 and for supplying hydraulic oil 23 discharged from the swivel clamp 3 to the working chamber 9.

The cap member 8 is configured to slide toward the piston member 5 in response to a decrease in hydraulic pressure of the hydraulic oil 23.

The cap member 8 has a retaining ring 30 arranged on the inner wall of the fitting hole 13. The housing 10 has a retaining ring 31 arranged on the inner wall of the working chamber 9 on the cap member 8 side. The piston member 5 has a guide groove 32 formed in the axial direction on the inner wall of the accommodation hole 11. The female screw member 6 has a guide groove 33 formed in the axial direction opposite the guide groove 32, and a pin 34 provided in the guide groove 33 opposite the guide groove 32. The piston member 5 has a guide groove 36 formed in the axial direction on its outer circumferential wall, and a guide hole 38 formed so that the male screw member 7 can be inserted therein. The housing 10 has a pin 37 arranged opposite the guide groove 36. A ring member 39 made of a ring-shaped rubber or resin is provided on the lower side of the piston member 5.
A receiving member 56 is attached to the male screw member 7 on the cap member 8 side of the working chamber 9 so as to be rotatable around the axis. The receiving member 56 is prevented from coming off by a retaining ring 31 arranged on the inner peripheral wall of the working chamber 9. A sliding groove 58 is formed in the circumferential direction on the outer peripheral wall of the receiving member 56, and a sliding groove 57 is formed in the circumferential direction on the inner peripheral wall of the receiving member 56. A plurality of ball members 59 are attached to the sliding groove 58, and a plurality of ball members 60 are attached to the sliding groove 57. The ball member 59 on the outer peripheral wall side is capable of rolling between the sliding groove 58 on the outer peripheral wall of the receiving member 56 and the inner peripheral wall of the working chamber 9. The ball member 60 on the inner peripheral wall side is capable of rolling between the sliding groove 57 formed on the inner peripheral wall of the receiving member 56 and an engagement portion 62 formed on the outer peripheral wall of the male screw member 7 in a tapered shape so as to widen toward the cap member 8 side.

The operation of the hydraulic supply device 4 configured in this manner will now be described.

Figure 5 is a cross-sectional view showing the operation of the hydraulic supply device 4 and the swivel clamp 3. Figure 6 is a cross-sectional view showing the operation of the hydraulic supply device 4. Components similar to those previously described are given the same reference numerals. Detailed descriptions of these components will not be repeated.

The hydraulic supply device 4 supplies the hydraulic oil 23 to the rotary clamp 3 when the rotary clamp 3 is released from the locked state shown in FIG. 3 to the released state shown in FIG.
3, when the swivel clamp 3 is in the locked state, the piston member 5 of the hydraulic supply device 4 is in a lower position away from the cap member 8. The cap member 8 is pressed by the hydraulic oil 23 in the working chamber 9 and rises to a position where the stopper portion 16 engages with the receiving portion 20 of the housing 10.

As shown in FIG. 6, when the recess formed at the tip of the rotational force transmission tool 25 for transmitting rotational force to the cap member 8 is engaged with the operating part 15 of the cap member 8, if the rotational force transmission tool 25 shifts horizontally and the tip of the rotational force transmission tool 25 comes into contact with and presses the operating part 15, the cap member 8 pressed against the operating part 15 slides downward against the hydraulic pressure of the hydraulic oil 23 in the working chamber 9.

Therefore, even if the rotational force transmission tool 25 shifts horizontally and the tip of the rotational force transmission tool 25 comes into contact with the operating unit 15, problems such as damage to the cap member 8 and related members can be avoided.

In addition, the cap member 8, which is pressed by the hydraulic oil 23 in the working chamber 9 and rises to a position where the stopper portion 16 engages with the receiving portion 20 of the housing 10, is engaged with the male thread member 7 so as to be axially slidable, so it descends when the hydraulic pressure of the hydraulic oil 23 decreases.

Therefore, when a malfunction occurs that reduces the hydraulic pressure of the hydraulic oil 23, the cap member 8, which is normally raised, is lowered, making it easier to discover the malfunction of the hydraulic supply device 4.

Next, as shown in FIG. 5, when the recess formed at the tip of the torque transmission tool 25 fits into the operating portion 15 of the cap member 8, the cap member 8 slides axially due to the hydraulic pressure of the hydraulic oil 23 until the stopper portion 16 of the cap member 8 engages with the receiving portion 20 of the housing 10.

After that, when the rotational force transmission tool 25 is rotated in the first direction around the axis by the operator or the robot, the cap member 8, whose operating part 15 is fitted into the recess of the rotational force transmission tool 25, transmits the rotational force to the male screw member 7. When the male screw member 7 rotates due to the rotational force, the piston member 5, which is provided with the female screw member 6 that screws into the male screw member 7, moves in the axial direction so as to approach the cap member 8 as shown in FIG. 5.

As a result, the hydraulic oil 23 in the working chamber 9 is supplied to the swivel clamp 3 through the hydraulic oil passage 21. The swivel clamp 3 supplied with the hydraulic oil 23 is released from the locked state shown in FIG. 3 to the released state shown in FIG. 5.

For example, when the hydraulic oil 23 is supplied from the working chamber 9 of the hydraulic supply device 4 through the hydraulic oil passage 21 to the working chamber 40 of the swivel clamp 3, the pushing force based on the hydraulic oil 23 supplied to the working chamber 40 acts to move the piston 42 toward the output rod 44 against the biasing force of the lock spring 41. Then, the piston 42 moves the output rod 44 straight upward on the opposite side to the piston 42 via the compression spring 43. Next, when the step portion 44a of the output rod 44 is received from above by the thrust bearing 45, the piston 42 compresses the compression spring 43. Then, the operation groove 46 of the piston 42 presses the rotation groove 48 of the output rod 44 upward via the transmission ball 47. Then, the output rod 44 is rotated by 90 degrees counterclockwise in a plan view relative to the piston 42.
Subsequently, the bottom wall of the receiving hole 49 of the piston 42 is received from above by the lower end of the output rod 44. This causes the swivel clamp 3 to switch from the clamped state of FIG. 3 to the unclamped state of FIG.

In contrast, when the rotational force transmission tool 25 rotates in a second direction around the axis, which is opposite to the first direction, the piston member 5 moves in the axial direction away from the cap member 8.

As a result, the hydraulic oil 23 in the swivel clamp 3 is discharged through the hydraulic oil passage 21 into the working chamber 9 of the hydraulic supply device 4. The swivel clamp 3 from which the hydraulic oil 23 has been discharged is locked and driven from the released state shown in FIG. 5 to the locked state shown in FIG. 3.

When the piston member 5 is in the lowermost position and in the storage state, hydraulic oil 23 is supplied from the working chamber 40 (release chamber) of the swivel clamp 3 to the working chamber 9 of the hydraulic supply device 4, the ring-shaped ring member 39 contracts and the capacity of the working chamber 9 increases. In other words, the amount of hydraulic oil 23 received in the working chamber 9 increases. This prevents damage to the hydraulic supply device 4 operating as a pump.

[Embodiment 2]
Fig. 7 is a cross-sectional view of the hydraulic supply device 4 and the link type clamp 3A according to the second embodiment. Fig. 8 is a cross-sectional view showing the operation of the hydraulic supply device 4 and the link type clamp 3A. Components similar to those described above are given the same reference numerals. Detailed descriptions of these components will not be repeated.

The link-type clamp 3A differs from the swivel-type clamp 3 described above in embodiment 1 in that it is in a released state when hydraulic oil 23 is not supplied as shown in FIG. 7, and in a locked state when hydraulic oil 23 is supplied as shown in FIG. 8.

The hydraulic supply device 4 may supply hydraulic oil 23 to the link-type clamp 3A when the link-type clamp 3A is locked from the release state shown in FIG. 7 to the locked state shown in FIG. 8.

When hydraulic oil 23 is supplied from the working chamber 9 of the hydraulic supply device 4 through the hydraulic oil passage 21 to the clamp chamber 50 of the link-type clamp 3A, the rod 51 rises as shown in FIG. 8, the clamp arm 52 is driven counterclockwise around the pin 53, and the pressing bolt 54 attached to the end of the clamp arm 52 presses the workpiece W downward.

Inversely to the above, when unclamping, the hydraulic oil 23 in the clamp chamber 50 is discharged through the hydraulic oil passage 21 into the working chamber 9 of the hydraulic supply device 4. This causes the rod 51 to descend and the clamp arm 52 to retract in the clockwise direction.

[Embodiment 3]
Fig. 9 is a cross-sectional view of the hydraulic supply device 4B and the swivel clamp 3 according to the third embodiment. Fig. 10 is a cross-sectional view showing the operation of the hydraulic supply device 4B and the swivel clamp 3. Components similar to those described above are given the same reference numerals. Detailed descriptions of these components will not be repeated.

The hydraulic supply device 4B differs from the hydraulic supply device 4 described above in the first and second embodiments in that the working chamber 9B is formed on the opposite side of the piston member 5 from the cap member 8.

The pressing mechanism includes an elastic member 26 that presses the cap member 8 in the axial direction. This elastic member 26 can be composed of, for example, a compression coil spring or a disc spring, and can be disposed between a recess formed in the end face of the end opposite the male threaded end of the male threaded member 7 and a recess formed in the bottom face of the fitting hole 13 of the cap member 8.

The hydraulic supply device 4B configured in this manner operates as follows:

First, as shown in FIG. 9, when the swivel clamp 3 is in the locked state, the piston member 5 of the hydraulic supply device 4B is in an upper position close to the receiving portion 27 of the housing 10 and the cap member 8. The cap member 8 is pressed axially by the elastic member 26 and rises to a position where the stopper portion 16 engages with the receiving portion 20 of the housing 10.

Next, as shown in FIG. 10, the recess formed at the tip of the torque transmission tool 25 fits into the operating part 15 of the cap member 8.

After that, when the rotational force transmission tool 25 is rotated in the second direction around the axis by the operator or the robot, the cap member 8, whose operating part 15 is fitted into the recess of the rotational force transmission tool 25, transmits the rotational force to the male screw member 7. When the male screw member 7 rotates due to the rotational force, the piston member 5, which is provided with the female screw member 6 that screws into the male screw member 7, moves in the axial direction away from the cap member 8 as shown in FIG. 10.

As a result, hydraulic oil 23 in the working chamber 9B is supplied to the swivel clamp 3 through the hydraulic oil passage 21B. The swivel clamp 3 supplied with hydraulic oil 23 is released from the locked state shown in FIG. 9 to the released state shown in FIG. 10.

[Embodiment 4]
Fig. 11 is a cross-sectional view of a main part of a hydraulic pressure supply device 4C according to embodiment 4. Fig. 12 is a cross-sectional view of another main part of the hydraulic pressure supply device 4C. Components similar to those described above are given the same reference numerals. Detailed description of these components will not be repeated.

The hydraulic supply device 4C includes a cap member 8C. The cap member 8C has a fitting hole 13 that fits with the male screw member 7, and a plurality of guide grooves 28 that extend in the axial direction on the inner wall of the fitting hole 13. The male screw member 7 has a through hole 17 (guide hole) formed along the radial direction corresponding to the guide grooves 28, a pair of ball members 18 provided in the through hole 17 facing the guide grooves 28, and an elastic member 19 provided between the pair of ball members 18 to urge the pair of ball members 18 toward the guide grooves 28. The elastic member 19 can be formed of, for example, a compression coil spring or a disc spring.
As shown in FIG. 11, when the ball member 18, which is biased radially outward by the elastic member 19, is engaged with the guide groove 28 formed in the engaging hole 13 of the cap member 8C, the cap member 8C and the male screw member 7 are rotated integrally around the axis.

In contrast, when the external torque from the torque transmission tool 25 that rotates the cap member 8C is greater than a predetermined torque, as shown in Fig. 12, the peripheral wall of the guide groove 28 of the cap member 8C on which the external torque acts pushes the ball member 18 radially inward. As a result, the ball member 18 is pushed into the through hole 17 against the biasing force of the elastic member 19. This causes the cap member 8C to rotate relative to the male screw member 7. As a result, even if an external torque greater than a predetermined torque acts on the cap member 8C, wear and damage to the engagement portion between the cap member 8C and the male screw member 7 is reduced.
13 and 14 are cross-sectional views of still another essential part of the hydraulic supply device 4C. The same components as those described above are given the same reference numerals. Detailed description of these components will not be repeated.
13 and 14, the through hole 17 may be formed of a bottomed hole 17a (guide hole). In this case, the male screw member 7 has a bottomed hole 17a formed along the radial direction corresponding to the guide groove 28, a ball member 18 provided in the bottomed hole 17a facing the guide groove 28, and an elastic member 19a provided in the bottomed hole 17a for urging the ball member 18 toward the guide groove 28.
Although the hydraulic supply device that supplies hydraulic pressure to the clamp device has been described as an example, the present invention is not limited to this. For example, the present invention can also be applied to an air supply device that supplies compressed air to the clamp device instead of hydraulic pressure.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in different embodiments.

1. Hydraulic clamp unit (fluid pressure clamp unit)
2 Conveying member 3 Swivel clamp (clamp device)
3A Link type clamp (clamp device)
4. Hydraulic supply device (pressure fluid supply/discharge device)
Reference Signs List 5: piston member 6: female screw member 7: male screw member 8: cap member 9: working chamber 10: housing 11: accommodation hole 12: pin member 13: fitting hole 14: guide groove 15: operating portion 16: stop portion 17: through hole (guide hole)
17a Bottomed hole (guide hole)
18 Ball member 19 Elastic member 20 Receiving portion 21 Hydraulic oil passage (hydraulic fluid passage)
22 Support device 23 Hydraulic oil (working fluid)
24 Pressing mechanism 25 Rotational force transmission tool 28 Guide groove

Claims (14)

a piston member inserted into the housing so as to be axially movable;
a female screw member provided in a receiving hole formed in the piston member in the axial direction;
A male screw member that screws into the female screw member;
a cap member that is fitted to the end of the male screw member opposite the male screw end so as to be slidable in the axial direction and that is fitted to the male screw member so as to be able to transmit a rotational force in a direction around the axis of the cap member;
a working chamber that is formed on the cap member side of the piston member or on an opposite side to the cap member, and to which a working fluid is supplied and discharged by movement of the piston member;
A pressing mechanism that presses the cap member in the axial direction.
A pressurized fluid supply and discharge device comprising: The cap member has a fitting hole into which the male screw member fits,
a guide groove extending in the axial direction on an inner wall of the fitting hole,
2. The pressure fluid supply/discharge device according to claim 1, wherein the male screw member has a pin member that engages with the guide groove. The pressurized fluid supply/discharge device according to claim 1, wherein the cap member has an operating part at the tip opposite the male screw member for receiving a rotational force in the direction around the axis. The pressurized fluid supply/discharge device according to claim 3, wherein the operating part has a polygonal convex part protruding in the axial direction or a polygonal concave part recessed in the axial direction. the housing has a receiving portion for preventing the cap member from falling off due to the fluid pressure of the working fluid,
The pressure fluid supply and discharge device according to claim 1 , wherein the cap member has a stop portion engageable with the receiving portion. The cap member has a fitting hole into which the male screw member fits,
a plurality of guide grooves extending in the axial direction on an inner wall of the fitting hole;
The male screw member has a guide hole formed along a radial direction corresponding to the guide groove;
a ball member provided in the guide hole opposite the guide groove;
2. The pressurized fluid supply/discharge device according to claim 1, further comprising an elastic member provided for urging said ball member toward said guide groove. The pressurized fluid supply and discharge device according to claim 1, further comprising a working fluid passage for supplying the working fluid discharged from the working chamber to the clamp device and for supplying the working fluid discharged from the clamp device to the working chamber. the working chamber is formed on the cap member side of the piston member,
The pressurized fluid supply/discharge device according to claim 1 , wherein the pressing mechanism contains a working fluid that is supplied to and discharged from the working chamber by movement of the piston member. the working chamber is formed on the piston member on the opposite side to the cap member,
The pressurized fluid supply/discharge device according to claim 1 , wherein the pressing mechanism includes an elastic member that presses the cap member in the axial direction. The pressurized fluid supply/discharge device according to claim 8, wherein the cap member is configured to slide toward the piston member in response to a decrease in hydraulic pressure of the working fluid. A conveying member configured to be movable along a track;
The pressurized fluid supply/discharge device according to claim 1 , which is provided on the conveying member;
a clamp device provided on the conveying member to receive the working fluid from the pressure fluid supply/discharge device and to discharge the working fluid to the pressure fluid supply/discharge device.
A fluid pressure clamping unit comprising: The hydraulic clamp unit of claim 11, wherein the clamping device includes a pair of pivoting clamps. The fluid pressure clamp unit according to claim 11, wherein the pressure fluid supply/discharge device supplies the working fluid to the clamp device when the clamp device is released from a locked state to a released state. The fluid pressure clamp unit according to claim 11, wherein the pressure fluid supply/discharge device supplies the working fluid to the clamp device when the clamp device is driven to lock from a release state to a locked state.

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