JP2003088999A - Clutch-brake device of machine press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch-brake device which can prevent any foreign matters from being bitten in an air cylinder to tighten a clutch mechanism and improve the durability of a lining. SOLUTION: In the clutch-brake device 1 comprising the clutch mechanism 5 to transmit the rotational force of a body member 3 to a driven member, a brake mechanism 6 to brake the rotation of the body member 3, and a switching mechanism 7 which switches the clutch mechanism 5 and the brake mechanism 6 in an interlocking manner, the switching mechanism 7 has the air cylinder 40 to tighten the clutch mechanism 5, the body member 3 has an annular end wall member 11 to close one end side of an air operation chamber 44 of the air cylinder 40, an annular cylindrical part 43a is formed on an air piston member 43 of the air cylinder 40, and the annular cylindrical part 43a is externally fitted to the annular end wall member 11 in an airtight and slidable manner to reliably operate the clutch mechanism 5 and the brake mechanism 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch / brake device for a mechanical press, and more particularly to a clutch / brake device configured to prevent metal dust and other foreign matter from being caught in an air cylinder for engaging and operating a clutch mechanism.

[0002]

2. Description of the Related Art Conventionally, a clutch / brake device for a mechanical press transmits or disconnects a rotational driving force input from an input shaft to a driven member on the crankshaft side. Wet or dry clutch / brake devices have been proposed and put to practical use. For example, the applicant of the present application is now putting the following dry clutch / brake devices into practical use.

As shown in FIG. 4, a dry clutch / brake device 100 includes a main body member 102 fixed to an input shaft 101 and a clutch for transmitting a rotational driving force input from the input shaft 101 to a driven member 103. A mechanism 104, a brake mechanism 105 for braking the rotation of the main body member 102, and a switching mechanism 106 for interlockingly switching the clutch mechanism 104 and the brake mechanism 105 are provided.

When the clutch mechanism 104 is in the engaged state, the main body member 102 and the clutch disc 110 are lined with each other.
1, 112, and the rotational driving force is transmitted to the driven member 103 via the clutch disc 110.
In the connected (braking) state of the brake mechanism 105, the body member 102 is connected to the brake disc 113 via the linings 114 and 115.
Is non-rotatably fixed to an external fixing member 116, the rotation of the main body member 102 is braked.

The switching mechanism 106 has an air cylinder 120 for engaging and operating the clutch mechanism 104. The air cylinder 120 includes a cylinder body 121, a piston member 122 fitted in a cylinder hole 121 a of the cylinder body 121 so as to be airtightly slidable, and a cylinder body 12.
1 and the piston member 122 form an air working chamber 12
3 and 3. The piston member 122 is integrally provided with a clutch plate 125 capable of pressing the clutch disc 110 to the right through the lining 111. When engaging the clutch mechanism 104, pressurized air is supplied to the air working chamber 123 to cause the piston member 12 to operate.
2 is driven to the right, the clutch plate 125 presses the clutch disc 110 to the right through the lining 111, and the clutch disc 110 causes the linings 11 on both sides to move.
The main body member 102 and the clutch disc 110 are connected by being sandwiched by 1, 112.

When the clutch mechanism 104 is actuated to the disengagement side (disengagement side), when the pressurized air in the air working chamber 123 is discharged, the clutch plate 125 is driven leftward by the spring 126, and the main body member 102 and the clutch. The disk 110 is divided. When the clutch mechanism 104 is engaged, friction clutch heats the clutch plate 125 to a high temperature. Therefore, an annular gap 127 for operating the piston member 122 is formed between the cylinder body 121 and the clutch plate 125.

[0007]

In the clutch / brake device 100 described above, since the annular gap 127 is formed between the cylinder body 121 of the air cylinder 120 and the clutch plate 125, the clutch mechanism 10 is provided.
4 operates to the disengagement side, the clutch plate 125
Is also driven to the left. At this time, when metal scraps or other foreign matter is caught in the annular gap 127, the main body member 102 and the clutch disc 110 are partially connected.

Therefore, a part of the rotational driving force is transmitted to the driven member 103 even in the disengaged state, and the clutch mechanism 1
04 does not operate normally, clutch disc 11
Since the main body member rotates in a state where the lining partially contacts 0 or the brake disc 113, the lining is unevenly worn and the life of the lining is shortened. An object of the present invention is to provide a clutch / brake device capable of reliably operating a clutch mechanism and a brake mechanism while preventing foreign matter from being caught in an air cylinder, improving durability of a lining, and the like. Is.

[0009]

According to another aspect of the present invention, there is provided a clutch / brake device for a mechanical press, wherein a main body member fixed to an input shaft for inputting a rotary drive force and a rotary drive force of the main body member to a driven member. In a dry clutch / brake device of a mechanical press, which includes a clutch mechanism for transmitting, a brake mechanism for braking rotation of a main body member, and a switching mechanism for interlocking switching between the clutch mechanism and the brake mechanism, the switching mechanism is an additional type. An air cylinder that receives a supply of compressed air to engage and operate a clutch mechanism, the main body member includes an annular end wall member that closes one end side of an air operation chamber of the air cylinder, and a piston member of the air cylinder. In the outer peripheral portion of, the annular cylindrical portion extending and protruding to the outer peripheral side of the annular end wall member is formed,
The annular tubular portion is fitted onto the annular end wall member in an airtight and slidable manner.

In the engaged state of the clutch mechanism, the rotational driving force input from the input shaft rotationally drives the main body member, and the rotation of the main body member is transmitted to the driven member via the clutch mechanism. When the clutch mechanism is switched to the engaged state by the switching mechanism, the brake mechanism is interlocked and switched to the disengaged state (non-braking state), and the rotation of the main body member is not braked. When the clutch mechanism is switched to the disengaged state by the switching mechanism, the brake mechanism is interlocked to switch to the connected state (braking state), and the rotation of the main body member is braked by the brake mechanism. The clutch mechanism includes a clutch disc connected to the driven member and a plurality of linings arranged on both sides of the clutch disc. When the clutch mechanism is engaged, the clutch discs are sandwiched between the linings on both sides to form a main body. The rotation of the member is transmitted to the driven member via the clutch disc.

The piston member of the air cylinder is integrally provided with a clutch plate capable of pressing the clutch disc toward the engaging side, and the piston member is biased toward the dividing side by a spring. When the clutch mechanism is engaged by the air cylinder, pressurized air is supplied to the air working chamber to drive the piston member to the engagement side against the urging force of the spring, and the clutch plate causes the clutch disc to go through the lining. Press. Further, when switching the clutch mechanism to the disengaged state, when the pressurized air in the air working chamber is discharged, the piston member is driven to the disengagement side by the spring, the clutch disc and the lining are separated, and the clutch disc and the main body member are separated from each other. Divided. Here, since the annular tubular portion of the piston member is externally fitted to the annular end wall member, when the piston member is driven to the dividing side, metal scraps and other It is possible to reliably operate the clutch mechanism and the brake mechanism without foreign matter being caught.

According to a second aspect of the present invention, there is provided a clutch / brake device for a mechanical press according to the first aspect, wherein the piston member is provided with a plurality of radial air passages for releasing cooling air. To do. Cooling air can be discharged from these air passages to cool the clutch plate. Further, the air passage is formed radially on the side opposite to the lining with respect to the clutch plate. In other words, it will be formed radially in the middle of the piston member in the axial direction, and even if metal dust or other foreign matter gets caught in these air passages, it will adversely affect the operation of the clutch mechanism and the brake mechanism. There is no.

According to a third aspect of the present invention, there is provided a clutch / brake device for a mechanical press according to the first or second aspect, wherein the main body member has a shaft end cover plate for covering a shaft end of the input shaft. In addition, an air port for supplying and discharging pressurized air is formed in the air cylinder. Therefore, it is possible to form an air passage connected to the air port inside the main body member and to supply and discharge the pressurized air to the air cylinder through the air port and the air passage.
It is not necessary to form an air port and an air passage on the input shaft.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described. In this embodiment, the present invention is applied to a dry clutch / brake device provided in a mechanical press. As shown in FIGS. 1 and 2, the clutch / brake device 1 includes a main body member 3 fixed to an input shaft 2 for inputting a rotary drive force, and a rotary drive force of the main body member 3 on a crankshaft side of a mechanical press. Clutch mechanism 5 for transmitting to the driven member 4 of
A brake mechanism 6 for braking the rotation of the main body member 3, a switching mechanism 7 for switching between the clutch mechanism 5 and the brake mechanism 6, and cooling for passing air for cooling the clutch mechanism 5 and the brake mechanism 6. And an air passage 8 for use.

As shown in FIG. 2, the main body member 3 includes an annular main body portion 10 fitted and fixed to the input shaft 2, and an annular end wall member 11 connected to the left end of the annular main body portion 10 with a bolt 13.
And a shaft end cover plate 12 connected to the right end of the annular main body 10 with a bolt 14. Annular body 10
The annular end wall member 11 is fitted onto the input shaft 2, and the shaft end of the input shaft 2 is covered with a shaft end cover plate 12. The input shaft 2 and the shaft end cover plate 12 are fixed by a plurality of (for example, four) bolts 15, and the main body member 3 is fixed to the input shaft 2 and rotates integrally with the input shaft 2. A taper ring 16 is attached to an inner peripheral portion of the annular main body 10 for facilitating attachment and detachment of the main body member 3 to the input shaft 2. The taper ring 16 is fixed to the shaft end cover plate 12 with a plurality of bolts. Has been done.

The clutch mechanism 5 has an annular clutch disc 20 connected to the driven member 4, an annular clutch plate 21 for pressing the clutch disc 20 to the right through a lining 23, and the clutch disc 20 lining. An annular support plate 22 and the like for receiving via 24 are provided. On the outer peripheral side portion of the clutch disc 20, one ends of two connecting members 25 are bolt-connected at positions symmetrical with respect to the axis. However, a plurality of bolt holes (not shown) are formed in the outer peripheral side portion of the clutch disc 20, so that the two connecting members 25 can be attached at arbitrary positions in the circumferential direction of the clutch disc 20. Pin members 26 are fixed to the other ends of the respective connecting members 25, and these pin members 26 are driven members 4
It is fixed to.

The clutch plate 21 is provided integrally with a piston member 43, which will be described later, and a plurality of circumferentially divided linings 23 are fixedly mounted on the right side portion of the clutch plate 21. The support plate 22 is integrally provided on the outer peripheral side portion of the annular main body portion 10, and a plurality of circumferentially divided linings 24 are fixedly attached to the left side portion of the support plate 22.

When the clutch plate 21 is driven to the right by the air cylinder 40, which will be described later, the clutch plate 21 pushes the clutch disc 20 to the right through the lining 23, and the clutch disc 20 moves to the lining 2.
It is sandwiched between 3,24. Therefore, due to the frictional force between the clutch disc 20 and the linings 23 and 24, the main body member 3 and the clutch disc 20 are connected and the clutch mechanism 5 is brought into the engaged state, and the rotational driving force is transmitted via the clutch disc 20 to the driven member. 4 is transmitted. When the clutch plate 21 is driven leftward by a spring 41, which will be described later, the clutch disc 20 is moved to the lining 23,
24 is separated, the main body member 3 and the clutch disc 20 are separated, the clutch mechanism 5 is separated, and the rotational driving force is not transmitted to the driven member 4.

The brake mechanism 6 has an annular brake disc 30 connected to an external fixing member 9, an annular brake plate 31 for pressing the brake disc 30 to the left via a lining 33, and a brake disc 30.
Is provided with an annular support plate 32 and the like for receiving the above through the lining 34. At the outer peripheral side portion of the brake disc 30, one ends of two connecting members 35 are bolt-connected at positions symmetrical with respect to the axis. However,
As shown in FIG. 1, a plurality of bolt holes 37 are formed in the outer peripheral side portion of the brake disc 30, so that the two connecting members 35 can be fixed at arbitrary positions in the circumferential direction. Pin members 36 are fixed to the other ends of the respective connecting members 35, these pin members 36 are fixed to an external fixing member 9, and the brake disc 30 is fixed so as not to rotate.

The brake plate 31 has an annular body portion 10.
It is slidably fitted on the annular portion 10a formed on the right end side portion of the above, and the relative horizontal movement of the brake plate 31 with respect to the main body member 3 is allowed. However, the relative rotation of the brake plate 31 with respect to the body member 3 is
The brake plate 31 is regulated by the key member 38 and rotates integrally with the main body member 3. Brake plate 31
A plurality of circumferentially divided linings 33 are fixedly mounted on the left side of the. Brake plate 31
A plurality of recesses 31a arranged in the circumferential direction are formed on the right side of the brake plate 31. The recesses 31a increase the contact area between the brake plate 31 and the outside air, and promote heat dissipation from the brake plate 31. The support plate 32 is integrally provided on the right side of the support plate 22 on the outer peripheral side portion of the annular main body portion 10, and on the right side portion of the support plate 32, a plurality of circumferentially divided linings 34 are fixed. Is attached to.

As will be described later, when the brake plate 31 is driven to the left in conjunction with the clutch plate 21,
The brake plate 31 presses the brake disc 30 to the left via the lining 33,
Is sandwiched between the linings 33, 34. Therefore,
Due to the frictional force between the brake disc 30 and the linings 33 and 34, the main body member 3 and the brake disc 30 are connected to each other, and the brake mechanism 6 is brought into a braking state.
Rotation is braked. On the contrary, when the brake plate 31 is driven to the right in conjunction with the clutch plate 21, the linings 33 and 34 are separated from the brake disc 30, the main body member 3 and the brake disc 30 are separated, and the brake mechanism 6 is separated. In the non-braking state, the rotation of the main body member 3 is not braked.

The switching mechanism 7 includes an air cylinder 40 for engaging and operating the clutch mechanism 5 by supplying pressurized air, and a plurality of (for example, 12) disengaging operations for the clutch mechanism 5.
Spring 41, clutch mechanism 5 and brake mechanism 6
A plurality of (for example, eight) connecting pins 42 for interlocking with
And so on. The air cylinder 40 has an annular body 1
An annular piston member 4 slidably fitted to the left half of 0
3, an air working chamber 44 that supplies pressurized air to drive the piston member 43 to the right, an annular end wall member 11 that closes one end side of the air working chamber 44, and the like.

On the outer peripheral portion of the left half of the piston member 43,
Annular cylindrical portion 43 extending and protruding to the outer peripheral side of the annular end wall member 11
a is formed, and the annular cylindrical portion 43a is formed into the annular end wall member 11
An air working chamber 44 is formed by the inner peripheral side portion of the annular cylindrical portion 43a and the annular end wall member 11 so as to be fitted in an airtight and slidable manner.

Inside the shaft end cover plate 12, an air port 45 for supplying / discharging pressurized air to / from the air cylinder 40 is formed, and the air port 45 is formed in the annular main body 10. And an air passage 47 formed inside the shaft end cover plate 12 is connected to the air working chamber 44. Further, the air port 45 is connected to an external air supply source (not shown). A seal member 48 is mounted between the annular main body portion 10 and the piston member 43, and a seal member 49 is also mounted between the annular cylindrical portion 43a and the annular end wall member 11. The working chamber 44 is kept airtight.

A plurality of spring chambers 50 are formed at equal intervals in the circumferential direction between the left side portion of the annular main body 10 and the right side portion of the piston member 43, and springs 41 are arranged in each spring chamber 50. There is. A communication hole 51 for communicating each spring chamber 50 with the outside is formed in the annular body 10.

In the outer peripheral side portion of the annular main body portion 10, a plurality of pin holes 52 are arranged at equal intervals in the circumferential direction so as to penetrate the annular main body portion 10 in the axial direction in a portion slightly axially closer to the support disks 22 and 32. Cylindrical sleeve members 53 are fitted in the pin holes 52, respectively. The connecting pin 42 is inserted into each sleeve member 53, and the connecting member 42 allows the piston member 43 and the brake plate 3 to be inserted.
1 is connected. The connecting pin 42 is prevented from coming off by a nut 54, and the linings 23, 24, 33, 3
When 4 wears, the amount of movement of the piston member 43 and the brake plate 31 in the left-right direction (that is, the stroke of the air cylinder 40) can be adjusted by the nut 54.

When pressurized air is supplied to the air working chamber 44 through the air port 45 and the air passages 46 and 47, the piston member 43 is driven rightward against the biasing force of the spring 41. As described above, since the clutch plate 21 is integrally provided at the right end of the piston member 43,
The clutch plate 21 is also driven to the right, and the clutch mechanism 5 is in the engaged state. At this time, the brake plate 3 connected to the piston member 43 by the connecting pin 42
1 is also interlocked and driven to the right, and the brake mechanism 6 is brought into a non-braking state.

When the pressurized air is discharged from the air operating chamber 44, the piston member 43 is driven leftward by the spring 41 and the clutch plate 21 is also driven leftward, so that the clutch mechanism 5 is disengaged. . At this time, the brake plate 31 is also interlocked and driven leftward, and the brake mechanism 6 will be in a braking state.

As shown in FIGS. 1 to 3, the cooling air passage 8 is provided.
Is a plurality of air introduction holes 6 for introducing cooling air from the outside.
0, an annular air passage 61 connected to the plurality of air introduction holes 60, and a plurality of air passages 62 and 63 radially extending from the annular air passage 61.

The air introduction hole 60 is provided in the brake plate 31.
A plurality (for example, 16) are formed in the circumferential direction on the right side of the. The annular air passage 61 is formed so as to extend in the axial direction between the annular main body 10 and the clutch mechanism 5 and the brake mechanism 6. The plurality of air passages 62 are
The plurality of air passages 63 are formed radially from the annular air passage 61 between the support plates 22 and 32, and the plurality of air passages 63 are provided on the left side of the clutch plate 21, that is, the piston member 43.
It is formed radially from the annular air passage 61 in the middle part in the left-right direction.

As shown by the arrow in FIG. 3, the air introduction hole 60
The cooling air introduced from the above flows to the left through the annular air passage 61 while cooling the axial center portions of the clutch mechanism 5 and the brake mechanism 6. Further, this cooling air is discharged to the outside from the air passage 62 while cooling the support plates 22 and 32, and is also discharged to the outside from the air passage 63 while cooling the clutch plate 21.

Next, the operation of the clutch / brake device 1
The effect will be described. When transmitting the rotational driving force of the input shaft 2 to the driven member 4, first, pressurized air is supplied from the external air supply source to the air working chamber 44 through the air port 45 and the air passages 46 and 47. When pressurized air is supplied to the air working chamber 44, the piston member 43 is driven rightward against the biasing force of the spring 41, and the clutch plate 2
1 presses the clutch disc 20 via the lining 23, and the clutch disc 20 receives the clutch plate 21.
2 on both sides between the support plate 22 and the support plate 22
It is sandwiched between 3,24. Due to the frictional force between the clutch disc 20 and the linings 23 and 24, the clutch disc 20 is connected to the main body member 3, the clutch mechanism 5 is in the engaged state, and the rotational driving force is transmitted via the clutch disc 20 to the driven member 4. Be transmitted to. At this time, the switching mechanism 7 brings the brake mechanism 6 into a non-braking state, and the rotation of the main body member 3 is not braked.

When the rotational driving force is not transmitted to the driven member 4, when the pressurized air in the air working chamber 44 is discharged from the air port 45, the piston member 43 is driven leftward by the spring 41, and the clutch disc 20 and Body member 3
Is disengaged and the clutch mechanism 5 is disengaged. At this time, the brake plate 31 is driven leftward together with the piston member 43 by the switching mechanism 7, and the brake plate 31 presses the brake disc 30 leftward.
Due to the frictional force between the brake disc 30 and the linings 33, 34, the brake disc 30 is connected to the main body member 3, the brake mechanism 6 enters a braking state, and the rotation of the main body member 3 is braked.

Here, the annular cylindrical portion 43 of the piston member 43
Since a is externally fitted to the annular end wall member 11, when the piston member 43 is driven to the left by the spring 41, metal dust or other foreign matter is present between the piston member 43 and the annular end wall member 11. Therefore, the clutch mechanism 5 and the brake mechanism 6 can be operated reliably.

Further, as shown by the arrow in FIG. 3, the cooling air introduced from the air introduction hole 60 passes through the annular air passage 61 while cooling the axial center side portions of the clutch mechanism 5 and the brake mechanism 6. It flows to the left. Further, this cooling air is discharged to the outside from the plurality of air passages 62 while cooling the support plates 22 and 32, and is also discharged to the outside from the plurality of air passages 63 while cooling the clutch plate 21. Therefore, heat dissipation of the frictional heat generated in the clutch mechanism 5 and the brake mechanism 6 is promoted, so that the clutch / brake device 1 can be used for a long time. Further, since the air passage 63 is radially formed in the middle portion of the piston member 43 in the left-right direction, the air passage 63 should not be damaged.
Even if metal scraps or other foreign matter is caught in, the operation of the clutch mechanism 5 and the brake mechanism 6 is not adversely affected.

Pressurized air can be supplied to and discharged from the air cylinder 40 through the air port 45 and the air passage 47 formed in the shaft end cover plate 12 and the air passage 46 formed in the annular main body 10. Since it is not necessary to form the air port 45 and the air passages 46 and 47 in the input shaft 2, the processing of the input shaft 2 is facilitated, which is advantageous in manufacturing cost.

The structure of the switching mechanism 7 is not limited to that of the above-described embodiment, but various changes can be made, for example, by appropriately changing the numbers of the springs 41 and the connecting pins 42. In addition, it goes without saying that the present invention can be applied to those which can be easily conceived by those skilled in the art based on the above-described embodiment without departing from the spirit of the present invention.

[0038]

According to the first aspect of the present invention, an annular cylindrical portion that extends and projects toward the outer peripheral side of the annular end wall member is formed on the outer peripheral portion of the piston member of the air cylinder, and the annular cylindrical portion is formed into the annular end wall. Since it is fitted to the member in a hermetically slidable manner, metal scraps and other foreign matter are not caught between the piston member and the annular end wall member, and the clutch mechanism and the brake mechanism can be operated reliably. . Moreover, since the linings of the clutch mechanism and the brake mechanism are not unevenly worn, the durability of the lining can be improved.

According to the second aspect of the present invention, since the piston member is provided with a plurality of radial air passages for releasing the cooling air, the cooling air is emitted from these air passages. Since the clutch plate can be cooled, the cooling efficiency is improved and the clutch / brake device can be used for a long time. Further, since these air passages are formed radially in the middle of the piston member in the axial direction, even if metal dust or foreign matter gets caught in the air passage, it may adversely affect the operation of the clutch mechanism and the brake mechanism. Absent. In addition, the same effect as that of the first aspect can be obtained.

According to the third aspect of the present invention, the shaft end cover plate of the main body member is formed with the air port for supplying / discharging the pressurized air to / from the air cylinder. Therefore, the main body member is provided with the air passage connected to the air port. It is possible to form and supply pressurized air to the air cylinder through the air port and the air passage. Therefore, it is not necessary to form an air port and an air passage in the input shaft, and the input shaft can be easily processed, which is advantageous in manufacturing cost. In addition, the same effect as that of claim 1 or 2 can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a clutch / brake device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged cross-sectional view near a cooling air passage.

FIG. 4 is a view of a conventional clutch / brake device corresponding to FIG. 2.

[Explanation of symbols]

1 Clutch / brake device 2 input axes 3 body member 4 Driven member 5 Clutch mechanism 6 Brake mechanism 7 Switching mechanism 11 Annular end wall member 12 Shaft end cover plate 40 air cylinder 43 Piston member 43a annular tube 44 Air working chamber 45 airport 63 Air passage

Claims (3)

[Claims] 1. A main body member fixed to an input shaft for inputting a rotational drive force, a clutch mechanism for transmitting the rotational drive force of the main body member to a driven member, and a brake mechanism for braking the rotation of the main body member. In a dry clutch / brake device for a mechanical press, which includes a switching mechanism that switches a clutch mechanism and a brake mechanism in an interlocking manner, the switching mechanism has an air cylinder that receives supply of pressurized air to engage and operate the clutch mechanism. The main body member has an annular end wall member that closes one end side of the air working chamber of the air cylinder, and an annular protrusion that extends to the outer peripheral side of the annular end wall member at the outer peripheral portion of the piston member of the air cylinder. A clutch / brake device for a mechanical press, characterized in that a tubular portion is formed, and the annular tubular portion is fitted onto an annular end wall member in an airtight and slidable manner. 2. The clutch / brake device for a mechanical press according to claim 1, wherein the piston member is provided with a plurality of radial air passages for discharging cooling air. 3. The main body member has a shaft end cover plate that covers a shaft end of an input shaft, and an air port for supplying and discharging pressurized air to and from the air cylinder is formed in the shaft end cover plate. The clutch / brake device for a mechanical press according to claim 1 or 2.