JP6911271B2 - Torque control wrench - Google Patents

Description

The present invention detects that the tightening force of the torque control wrench has reached the set value by the relief valve released by the pressure of the hydraulic oil of the hydraulic impact torque generator, and detects the pressure of the hydraulic oil passing through the relief valve. The present invention relates to a torque control wrench that is taken out from the downstream side of the relief valve through a passage of hydraulic oil formed in the upper lid of the liner so that the ON / OFF mechanism of the motor is operated by the pressure of the hydraulic oil.

In the torque control wrench, the shut-off valve of the torque control wrench that detects that the tightening force of the torque control wrench has reached the set value and activates the shut-off valve that shuts off the supply of high-pressure air to the air motor. A mechanism is adopted (see, for example, Patent Documents 1 and 2).

An example of the shut-off valve mechanism will be described with reference to the torque control wrench 1 shown in FIGS. 6 to 7.
The torque control wrench 1 has a main valve 2 for supplying and stopping high-pressure air and a forward / reverse rotation switching valve 3 for selectively generating a striking torque for forward / reverse rotation, and feeds from the valves 2 and 3. The air motor 4 that generates rotational torque is driven by the high-pressure air that is noticed.
A hydraulic striking torque generator 5 that converts the rotational torque of the air motor 4 into striking torque is provided in the front case 6.
In the hydraulic impact torque generator 5, a liner 50 including a liner main body 51, a liner upper lid 52, and a liner lower lid 53 is arranged in a liner case 56, and the liner 50 is filled with hydraulic oil and sealed, and the liner 50 is sealed. One or more (two in this example) blade insertion grooves are provided in the main shaft 7 coaxially inserted inside. Then, the blade 54 is inserted into the blade insertion groove, and the blade 54 is urged by the spring 55 so as to be in sliding contact with the inner peripheral surface of the liner main body 51, and one or a plurality of the blades 54 are placed on the outer peripheral surface of the main shaft 7. Form individual sealing surfaces.
Further, a plurality of (four in this example) sealing surfaces are formed on the inner peripheral surface of the liner main body 51, and an output adjusting mechanism 8 for adjusting the magnitude of the striking torque is provided.
Then, by rotating the liner 50 by the air motor 4, a plurality of sealing surfaces formed on the inner peripheral surface of the liner main body 51 of the liner 50, and the sealing surfaces and blades 54 and 54 formed on the outer peripheral surface of the main shaft 7 are formed. When they match, a striking torque is generated on the spindle 7.

When the tightening force of the torque control wrench 1 reaches a set value, the shut-off valve mechanism 9 shuts off the supply of high-pressure air to the air motor 4.
The shut-off valve mechanism 9 uses the relief valve 83 of the output adjusting mechanism 8 which releases the tightening force of the torque control wrench 1 to the set value by the pressure of the hydraulic oil of the hydraulic impact torque generator 5. When detected, the pressure of the hydraulic oil passing through the relief valve 83 is applied to the piston 91 arranged on the liner upper lid 52, and the pilot valve is passed through the rod 92 arranged on the back of the piston 91 through the air motor 4. The 93 is operated to operate the shut-off valve 95 that shuts off the supply of high-pressure air to the air motor.

More specifically, as shown in detail in FIG. 7, the shut-off valve mechanism 9 has an air port 11a into which high-pressure air supplied to the air motor 4 is introduced into one end side of the shut-off valve 95 at the other end. Air ports 11c into which high-pressure air is introduced through the communication holes 95a are formed on the sides, respectively, and a spring 96 for urging the shut-off valve 95 in the opening direction is arranged, and the shut-off valve 95 is provided with a spring 96. The air port 11c formed on the other end side and the air port 11d on the front side (rod 92 side) of the pilot valve 93 are communicated with each other through the communication hole 13 so that the pressure of high pressure air is applied to the front surface of the pilot valve 93, while The air port 11e on the back side (opposite side of the rod 92) of the pilot valve 93 is communicated with the outside through the communication hole 13, and the pilot valve 93 is further inserted into the air port 11e in the direction of the air port 11d, that is, the pilot valve 93. A spring 94 that urges the valve in the closing direction is arranged.

As a result, when the tightening force of the torque control wrench 1 reaches the set value, the relief valve 83 of the output adjusting mechanism 8 is opened by the pressure of the hydraulic oil of the hydraulic impact torque generator 5, and the operation passes through the relief valve 83. The oil pressure acts on the piston 91 disposed on the liner upper lid 52, and the pilot valve 93 is operated and opened via the rod 92 disposed on the back of the piston 91 through the air motor 4.
When the pilot valve 93 is opened, the high-pressure air in the air port 11c is discharged to the outside through the communication hole 13, the air port 11d, the air port 11e, and the communication hole 13, and the pressure in the air port 11c decreases. As a result, the shut-off valve 95 moves from the position on the right side shown in FIGS. 6 to 7 to the position on the left side, and the air port 11a in which high-pressure air is introduced and the air port 11b communicating with the air motor 4 Is shut off, the supply of high-pressure air to the air motor 4 is stopped, and the bolt or the like can be tightened with a predetermined tightening force set in advance.

By the way, in the shut-off valve mechanism 9, the pressure of the hydraulic oil is applied to the piston 91, the pilot valve 93 is operated via the piston 91 and the rod 92, and the shut-off valve 95 is operated. As shown in FIG. 6, the hydraulic oil was made to act directly on the piston 91.

Then, an O-ring 91a is provided on the outer peripheral portion of the piston 91 arranged in the cylinder 52b formed on the liner upper lid 52 so that the hydraulic oil does not flow into the rod 92 side, and the hydraulic oil is sealed. ..

However, the O-ring 91a provided on the outer peripheral portion of the piston 91 has poor durability, and there is a problem that hydraulic oil leaks to the rod 92 side, causing a failure of the torque control wrench.

In order to deal with this problem, the applicant has previously proposed the torque control wrench shown in FIGS. 1 to 4 (see Patent Document 3).
As shown in FIG. 1B, this torque control wrench is provided with a diaphragm member 11 for blocking the flow of hydraulic oil at a position where the hydraulic oil passage 52a formed in the liner upper lid 52 opens. By taking out the pressure of the hydraulic oil through 11, it is possible to provide a torque control wrench having excellent durability without leakage of the hydraulic oil which causes a failure of the torque control wrench. Met.

Jikkenhei 3-400076 Gazette Japanese Unexamined Patent Publication No. 11-165274 JP-A-2018-157199

As described above, the torque control wrench described in Patent Document 3 has the above-mentioned advantages, but the present invention has improved this and is durable without leakage of hydraulic oil which causes a failure of the torque control wrench. It is an object of the present invention to provide a torque control wrench that enjoys the advantage of excellent properties, has a simple structure, and can be easily disassembled and replaced during assembly and maintenance.

In order to achieve the above object, the torque control wrench of the present invention detects that the tightening force of the torque control wrench has reached the set value by the relief valve released by the pressure of the hydraulic oil of the hydraulic impact torque generator. , The pressure of the hydraulic oil passing through the relief valve is taken out from the downstream side of the relief valve through the passage of the hydraulic oil formed on the liner upper lid, and the ON / OFF mechanism of the motor is operated by the pressure of the hydraulic oil. In the torque control wrench, the structure is such that the hydraulic oil flowing out from the passage is guided to the through hole formed in the center by communicating with the opening of the passage in the cylinder through which the passage of the hydraulic oil formed in the liner upper lid opens. disposed passage member, one of the position opening of the through hole of the passage member, to match the center of the through hole, the diaphragm member to shut the flow of the hydraulic oil, the end face of the liner upper lid cylinder liner upper lid It is characterized in that the flange portion of the diaphragm member is sandwiched between the liner upper lid holding member and the liner upper lid holding member arranged on the outside of the diaphragm member, and the pressure of the hydraulic oil is taken out through the diaphragm member.

In this case, a ball can be arranged on the back surface of the diaphragm member, and the pressure of the hydraulic oil can be applied to the ball from the diaphragm member to operate the ON / OFF mechanism of the motor.

By sealing the hydraulic oil with a diaphragm member, this torque control wrench can eliminate the leakage of hydraulic oil that causes a failure of the torque control wrench, and at the same time, it can be applied to the outer periphery of the piston, which has poor durability. By omitting the provided O-ring, it has excellent durability, the structure is simple, the installation state of the diaphragm member is stable, and reliable sealing performance can be obtained, and it can be disassembled and replaced during assembly and maintenance. A torque control wrench can be provided that can be easily performed.

Further, a ball is arranged on the back surface of the diaphragm member, and the pressure of the hydraulic oil is applied to the ball from the diaphragm member to operate the ON / OFF mechanism of the motor, thereby increasing the pressure of the hydraulic oil. It can be smoothly transmitted to the ON / OFF mechanism of the motor.

A conventional torque control wrench is shown, (a) is a front vertical sectional view, (b) is a front vertical sectional view of a main part, and (c) is an explanatory view of a diaphragm member. It is sectional drawing which shows the hydraulic impact torque generator. The output adjustment mechanism is shown. FIG. .. A shut-off valve mechanism to which a detection mechanism is attached is shown, (a) is a front vertical sectional view, and (b) is an axially orthogonal sectional view. An embodiment of the torque control wrench of the present invention is shown, (a) is a front vertical sectional view of a main part, and (b) is an explanatory view of a diaphragm member. A conventional torque control wrench is shown, (a) is a front vertical sectional view, (b) is an AA sectional view of (a), and (c) is an explanatory view of a piston. It is a front vertical sectional view which shows the main part of the shut-off valve mechanism.

Hereinafter, embodiments of the torque control wrench of the present invention will be described with reference to the drawings.

First, the basic structure of the torque control wrench of the present invention will be described using the torque control wrench described in Patent Document 3 having the same basic structure shown in FIGS. 1 to 4.
The torque control wrench 1 has a main valve 2 for supplying and stopping high-pressure air and a forward / reverse rotation switching valve 3 for selectively generating a striking torque for forward / reverse rotation, and feeds from the valves 2 and 3. The air motor 4 that generates rotational torque is driven by the high-pressure air that is noticed.
A hydraulic striking torque generator 5 that converts the rotational torque of the air motor 4 into striking torque is provided in the front case 6.

In the hydraulic impact torque generator 5, a liner 50 including a liner main body 51, a liner upper lid 52, and a liner lower lid 53 is arranged in a liner case 56, and the liner 50 is filled with hydraulic oil and sealed, and the liner 50 is sealed. One or more (two in this example) blade insertion grooves are provided in the main shaft 7 coaxially inserted inside.
The blade 54 is inserted into the blade insertion groove, and the blade 54 is urged by the spring 55 so as to be in sliding contact with the inner peripheral surface of the liner main body 51, and one or more (one or more) (one or more) on the outer peripheral surface of the spindle 7. In this example, two) sealing surfaces 7a and 7a are formed. Further, a plurality of (four in this example) sealing surfaces 5a, 5a, 5b, and 5b are formed on the inner peripheral surface of the liner main body 51, and an output adjusting mechanism 8 for adjusting the magnitude of the striking torque is provided. ..
Then, by rotating the liner 50 by the air motor 4, a plurality of sealing surfaces 5a, 5a, 5b, 5b formed on the inner peripheral surface of the liner 50 and the sealing surfaces 7a, 7a and 7a formed on the outer peripheral surface of the main shaft 7 are formed. When the blades 54 and 54 match, a striking torque is generated on the main shaft 7.

Here, the seal surfaces 7a and 7a formed on the outer peripheral surface of the main shaft 7 of the hydraulic impact torque generator 5 are eccentrically formed so that the straight line connecting the seal surfaces 7a and 7a does not pass through the center of the main shaft 7. I am trying to do it.
As a result, the main valve 2 and the switching valve 3 are operated to supply high-pressure air to the air motor 4 to rotate the air motor 4, thereby rotating the liner 50 of the hydraulic impact torque generator 5 and causing the liner 50 to rotate. For each rotation, the sealing surfaces 5a, 5a, 5b, 5b formed on the inner peripheral surface of the liner body 51 of the liner 50 and the sealing surfaces 7a, 7a and the blades 54, 54 formed on the outer peripheral surface of the spindle 7 are matched once. At this time, the cavity formed inside the liner 50 is divided into two high-pressure chambers H and two low-pressure chambers L, and the blades 54 and 54 are pushed toward the low-pressure chamber L, so that the liner 50 1 An intermittent striking torque is generated in the spindle 7 once per rotation.

By the way, the liner main body 51 of the liner 50 is provided with an output adjusting mechanism 8 for adjusting the magnitude of the striking torque.
The output adjusting mechanism 8 has an output adjusting mechanism insertion hole 51a formed parallel to the axis of the liner main body 51, and an output adjusting mechanism insertion between two chambers divided by the sealing surface 7a of the main shaft 7 with the sealing surface 5b interposed therebetween. Ports P1 and P2 that communicate with the hole 51a, and a spring 84 that urges the relief valve shaft 81, the adjustment shaft 82, the relief valve 83, and the relief valve 83 that are inserted into the output adjusting mechanism insertion hole 51a in the closing direction. It is configured with.
The relief valve shaft 81 is made to slide in the output adjusting mechanism insertion hole 51a by rotating the adjusting shaft 82 screwed with the relief valve shaft 81, and is mounted on the outer peripheral surface of the relief valve shaft 81. A passage 81q formed of a concave groove that communicates the port P1 and the port P2 is formed, and the relief valve shaft 81 is further communicated between the passage 81p that penetrates the relief valve shaft 81 in the direction perpendicular to the shaft and the middle of the passage 81p to connect the relief valve shaft 81. A passage 81r for supplying hydraulic oil is formed on the relief valve 83 side of the output adjusting mechanism insertion hole 51a through the shaft direction.

When the liner 50 of the hydraulic impact torque generator 5 is rotated, the output adjusting mechanism 8 causes a predetermined amount of hydraulic oil to flow from the high pressure chamber H to the low pressure chamber L side via the port P1, the passage 81q, and the port P2. At this time, until the tightening force of the torque control wrench 1 reaches the set value (the pressure of the hydraulic oil in the high pressure chamber H reaches the set pressure), the relief valve 83 keeps the relief valve shaft 81 due to the urging force of the spring 84. The hydraulic oil passage 81r opened at the end face of the water is maintained in a closed state.
Then, when the tightening force of the torque control wrench 1 reaches the set value (the pressure of the hydraulic oil in the high pressure chamber H reaches the set pressure), the relief valve 83 is opened, and a part of the hydraulic oil is released from the port P1. The pressure of the hydraulic oil is distributed in the cylinder 52b formed in the liner upper lid 52 by passing through the relief valve 83 through the passage 81q and the passage 81r and flowing out through the passage 52a formed in the liner upper lid 52. It is configured to act on the piston 91.

Specifically, as shown in FIG. 1B, the passage member 10 and the diaphragm member 11 are arranged in the cylinder 52b in which the hydraulic oil passage 52a formed in the liner upper lid 52 opens.

The passage member 10 has a structure that communicates with the opening of the passage 52a of the hydraulic oil and guides the hydraulic oil flowing out from the passage 52a to a through hole formed in the center of the passage member 10, and has a diaphragm member 11 and a check valve on both sides thereof. 15 and 15 are arranged respectively.
That is, the passage member 10 is arranged on the central axis of the torque control wrench 1, and the passage member 10 is operated by a through hole that opens to the air motor 4 side and the hydraulic impact torque generator 5 side, respectively. An oil passage is formed so that the pressure of the hydraulic oil acts on the piston 91 arranged in the cylinder 52b formed on the liner top lid 52 via the diaphragm member 11, and the liner top lid 52 and the spindle 7 are formed. It is formed so as to communicate with the inside of the liner 50 through a gap between the rear portion.

Then, a check valve 15 is arranged at the outlet of the hydraulic oil passage on the hydraulic impact torque generator 5 side of the passage member 10, and a spring that urges the check valve 15 in the direction of closing the passage member 10. 16 is arranged in a hole 72 formed in the rear portion 71 of the main shaft 7.
By arranging the check valve 15 at the outlet of the passage member 10 on the hydraulic impact torque generator side in this way, a small amount of hydraulic oil leaking from the relief valve 83 when a normal impact torque is generated can be generated. It is possible to prevent the outflow through the gap between the liner upper lid 52 and the rear portion of the spindle 7, that is, the leakage of the hydraulic oil from the relief valve 83, thereby improving the work efficiency of the tightening work and at the same time. A stable tightening force can be obtained.
Further, after shut-off, the check valve 15 is opened against the urging force of the spring 16 at the same time as the piston 91 returns, and the hydraulic oil in the cylinder 52b is discharged to the liner upper lid 52 and the rear part of the spindle 7. It can be returned to the hydraulic impact torque generator side through the gap between them.
Therefore, the urging force obtained by summing the urging force of the spring 94 urging the pilot valve 93 and the urging force of the spring 97 urging the piston 91, which will be described later, is larger than the urging force of the spring 16 urging the check valve 15. The urging forces of the spring 16, the spring 94, and the spring 97 are set so as to be large.
Even when the relief valve 83 is opened and the pressure of the hydraulic oil acts on the piston 91 to shut off, the check valve 15 is opened against the urging force of the spring 16, but the liner top lid 52 and the rear part of the spindle 7 are rear. Since the gap between the piston and the piston 91 is narrow, the movement of the piston 91 via the diaphragm member 11 is not hindered.

On the other hand, in the adjustment of the magnitude of the striking torque, the relief valve shaft 81 is slid in the output adjusting mechanism insertion hole 51a by rotating the adjusting shaft 82, and the relief valve 83 is urged by the spring 84. By adjusting the urging force of the passage 81q that communicates the port P1 and the port P2, the opening amount of the passage 81q is adjusted.
In this case, when the relief valve shaft 81 rotates, the direction of the opening of the passage 81p fluctuates, making it difficult to accurately adjust the magnitude of the striking torque. Therefore, as shown in FIG. 3, the shaft of the relief valve shaft 81 An elongated hole 81h is bored in the direction, and a knock pin 57 provided in the liner main body 51 of the liner 50 is inserted into the elongated hole 81h to prevent rotation.

The relief valve shaft 81 can also be provided inside the liner upper lid 52 of the hydraulic impact torque generator 5.
By providing the relief valve shaft 81 inside the liner upper lid 52, the outer diameter of the hydraulic impact torque generator 5 can be reduced, and the liner main body 51, the liner upper lid 52, the liner lower lid 53, and the knock pin 57 constituting the liner 50 can be reduced. The tolerance of the accuracy can be increased, and the sealing property between the liner main body 51 and the liner upper lid 52 is not affected by the output adjusting mechanism insertion hole 51a.

Further, by setting the opening amount of the passage 81p communicating the port P1 and the port P2 to be small, the detection pressure is lowered, the urging force of the relief valve 83 by the spring 84 can be easily adjusted, and the port P1 and the port P2 are used. It is possible to make the adjustment of the magnitude of the striking torque function more effectively by adjusting the opening amount of the passage 81q that communicates with the passage 81q. The detection pressure for operating the shut-off valve mechanism 9, which will be described later, becomes too low, or the amount of hydraulic oil flowing from the passage 81p into the passage 81r is insufficient, and conversely, the striking torque can be adjusted accurately. It may disappear.
In order to improve this, as shown in FIG. 3, the passage 81p is formed in an orifice shape having a large diameter on one side and a small diameter on the other side instead of a through hole, and becomes the high pressure chamber H side during normal rotation. The relief valve shaft 81 is arranged so that the diameter on the port P1 side is larger than the diameter on the port P2 side on the low pressure chamber L side.
As a result, it is possible to secure the amount of oil flowing from the passage 81p into the passage 81r while making the adjustment of the magnitude of the striking torque by adjusting the opening amount of the passage 81q communicating the port P1 and the port P2 more effectively. It is possible to accurately adjust the magnitude of the striking torque.

Further, when adjusting the opening amount of the passage 81q communicating the port P1 and the port P2, the passage 81p and the passage 81q are provided in order to prevent the pressure of the hydraulic oil applied to the passage 81p communicating the port P1 and the port P2 from fluctuating. It is desirable to form a separation wall 81s on the relief valve shaft 81.

Then, as described above, when the tightening force of the torque control wrench 1 reaches the set value (the pressure of the hydraulic oil in the high pressure chamber H reaches the set pressure), the relief valve 83 is opened and a part of the hydraulic oil is released. It passes through the relief valve 83 and flows out through the passage 52a formed in the liner upper lid 52, and this hydraulic oil is guided to the through hole formed in the center of the passage member 10 and reaches the diaphragm member 11. become.

The diaphragm member 11 is made of an oil-resistant flexible material such as nitrile rubber (NBR) having a hemispherical diaphragm portion, and the protruding side of the hemispherical diaphragm portion receives the pressure of hydraulic oil. As described above, it is fixed in the cylinder 52b, and at the position of the diaphragm member 11 in the cylinder 52b, the flow of the hydraulic oil is blocked and the pressure of the hydraulic oil is transmitted to the back side.

Specifically, as shown in FIG. 1B, a piston 91 is arranged on the back surface of the diaphragm member 11 via a ball 12 having a shape that fits into the hemispherical diaphragm portion of the diaphragm member 11. When the pressure of the hydraulic oil acts, the hemispherical diaphragm portion is deformed, specifically, deformed so as to protrude in the opposite direction, and the pressure of the hydraulic oil is transferred from the diaphragm member 11 to the ball 12 via the ball 12. It is made to act on the piston 91.
As a result, leakage of hydraulic oil that causes a failure of the torque control wrench 1 can be eliminated, and at the same time, the O-ring 91a provided on the outer peripheral portion of the piston 91 having poor durability is omitted (furthermore, the piston). It is also possible to omit the 91 and directly operate the rod 92 by the ball 12), and the durability of the torque control wrench 1 can be improved.
In particular, by disposing the balls 12 on the back surface of the diaphragm member 11 and allowing the pressure of the hydraulic oil to act on the balls 12 from the diaphragm member 11, the pressure of the hydraulic oil can be smoothly transmitted.

In this way, the pressure of the hydraulic oil acts on the piston 91 arranged in the cylinder 52b formed on the liner upper lid 52, and is arranged on the back of the piston 91 so as to penetrate the air motor 4. Since the pilot valve 93 is arranged via the rod 92, when the piston 91 under the pressure of the hydraulic oil moves to the right in FIG. 1, the pilot valve 93 is operated via the rod 92. The shut-off valve mechanism 9 as an ON / OFF mechanism of the air motor 4 is configured by operating the shut-off valve 17 that shuts off the supply of high-pressure air to the air motor 4.

As shown in FIGS. 1 and 4, the shut-off valve mechanism 9 forms air ports 18a and 18b on both sides of the shut-off valve 17 having a T-shaped cross section, respectively, in which high-pressure air is introduced. The air port 18a of the above is formed so as to communicate with the air motor 4 via the passage 18c.
A communication hole 19 communicating with the outside is formed in the rod insertion portion that communicates with the air port 18a via the pilot valve 93.
The pilot valve 93 and the shut-off valve 17 are mutually supported via a spring 94, and the spring 94 urges the pilot valve 93 to close and opens the shut-off valve 17. I'm urging.

In this shut-off valve mechanism 9, when the tightening force of the torque control wrench 1 reaches a set value (the pressure of the hydraulic oil in the high pressure chamber H reaches the set pressure), the pressure of the hydraulic oil of the hydraulic striking torque generator 5 The relief valve 83 of the output adjusting mechanism 8 is opened, and the pressure of the hydraulic oil passing through the relief valve 83 acts on the piston 91 arranged on the liner upper lid 52, and is arranged through the air motor 4 on the back of the piston 91. The pilot valve 93 is operated against the spring 94 and opened via the provided rod 92.
When the pilot valve 93 is opened, the air port 18a on the side communicating with the air motor 4 communicates with the outside through the communication hole 19 and the pressure drops, so that the shutoff valve 17 is on the opposite side of the air port 18b. Pushed by the high-pressure air of the above, it moves to the left in FIGS. 1 and 4 (a) and blocks the passage 18c leading to the air motor 4.
As a result, the supply of high-pressure air to the air motor 4 is stopped, and the bolts and the like can be tightened with a predetermined tightening force set in advance.

Further, as shown in FIG. 4, the number of times the shutoff valve 17 is operated is detected by detecting the pressure change of the airport 18b at the air port 18b on the back surface of the shutoff valve 17, and the number of times the bolt or the like is tightened. The detection mechanism 20 (this detection mechanism 20 is such that the conduit 20c connected to the control device is connected to the detection hole 20a communicating with the air port 18b, and the detection hole 20a is connected to the detection hole 20a by a spring 20d. The urged ball valve 20b may be arranged to seal the high pressure air) so that the tightening operation can be automatically managed.

By the way, in the torque control wrench 1 described in Patent Document 3, as shown in FIG. 1 (b), the passage member 10 and the diaphragm member 11 are contained in the cylinder 52b in which the hydraulic oil passage 52a formed in the liner upper lid 52 opens. However, in the torque control wrench of the present invention, this is improved as described below.

That is, as shown in FIG. 5, a passage member 10 is arranged in a cylinder 52b in which the hydraulic oil passage 52a formed in the liner upper lid 52 opens, and a diaphragm member that blocks the flow of the hydraulic oil is provided at the tip thereof. 11 is arranged by sandwiching the flange portion 11f of the diaphragm member 11 between the liner upper lid 52 and the liner upper lid holding member 58 arranged on the outside thereof, and the liner upper lid fixing member 59 is fastened from the outside thereof. , The pressure of the hydraulic oil is taken out through the diaphragm member 11.
Here, other configurations are the same as those of the torque control wrench 1 described in Patent Document 3.
As a result, leakage of hydraulic oil that causes a failure of the torque control wrench 1 can be eliminated, and at the same time, the O-ring 91a provided on the outer peripheral portion of the piston 91 having poor durability is omitted (furthermore, the piston). It is also possible to omit the 91 and directly operate the rod 92 by the ball 12), and the durability of the torque control wrench 1 can be improved.
In particular, by disposing the balls 12 on the back surface of the diaphragm member 11 and allowing the pressure of the hydraulic oil to act on the balls 12 from the diaphragm member 11, the pressure of the hydraulic oil can be smoothly transmitted.
Further, the structure is simple, the installation state of the diaphragm member 11 is stable, a reliable sealing property can be obtained, and disassembly and replacement at the time of assembly and maintenance can be easily performed.

The torque control wrench of the present invention has been described above based on the embodiment thereof, but the present invention is not limited to the configuration described in the above embodiment, and the present invention is not limited to the configuration described in the above embodiment, for example, instead of an air motor that generates rotational torque. The configuration can be appropriately changed within a range that does not deviate from the purpose, such as using an electric motor.

The torque control wrench of the present invention does not leak hydraulic oil that causes the torque control wrench to malfunction, has excellent durability, has a simple structure, and can be easily disassembled and replaced during assembly and maintenance. It is possible to detect that the tightening force of the torque control wrench has reached the set value by the relief valve released by the pressure of the hydraulic oil of the hydraulic impact torque generator, and the operation passes through the relief valve. Widely used for torque control wrench in which the pressure of oil is taken out from the downstream side of the relief valve through the passage of hydraulic oil formed in the upper lid of the liner, and the ON / OFF mechanism of the motor is operated by the pressure of the hydraulic oil. can do.

1 Torque control wrench 2 Main valve 3 Forward / reverse rotation switching valve 4 Air motor 5 Hydraulic impact torque generator 50 Liner 54 Blade 58 Liner top lid holding member 59 Liner top lid fixing member 6 Front case 7 Spindle 71 Main shaft rear 72 holes 8 Output adjustment Mechanism 81 Relief valve shaft 82 Adjustment shaft 83 Relief valve 84 Spring 9 Shut-off valve mechanism (motor ON / OFF mechanism)
91 Piston 92 Rod 93 Pilot valve 94 Spring 10 Passage member 11 Diaphragm member 11f Flange part 12 Ball 15 Check valve 16 Spring 17 Shut-off valve 18a, 18b Airport 18c Passage 19 Communication hole 21 Torque control wrench 22 Main switch 23 Forward / reverse rotation Changeover switch 24 Electric motor 25 Electric switch (motor ON / OFF mechanism)

Claims (2)

The relief valve released by the pressure of the hydraulic oil of the hydraulic impact torque generator detects that the tightening force of the torque control wrench has reached the set value, and the pressure of the hydraulic oil passing through the relief valve is detected by the relief valve. In a torque control wrench that is taken out from the downstream side through a passage of hydraulic oil formed in the upper lid of the liner and the ON / OFF mechanism of the motor is operated by the pressure of the hydraulic oil.
A passage member having a structure that communicates with the opening of the passage and guides the hydraulic oil flowing out from the passage to the through hole formed in the center is arranged in the cylinder through which the passage of the hydraulic oil formed in the liner upper lid opens. At one position where the through hole of the passage member is opened, a diaphragm member that coincides with the center of the through hole and blocks the flow of hydraulic oil is arranged on the end surface of the cylinder of the liner top lid and the outside of the liner top lid. A torque control wrench characterized in that the flange portion of the diaphragm member is sandwiched between the liner upper lid holding member and the diaphragm member, and the pressure of hydraulic oil is taken out through the diaphragm member. The first aspect of the present invention, wherein a ball is arranged on the back surface of the diaphragm member, and the pressure of hydraulic oil is applied to the ball from the diaphragm member to operate the ON / OFF mechanism of the motor. Torque control wrench.

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