JPH11333643A - Multiaxial nut runner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiaxial nut runner to be worked by less consumption energy, reduce the number of wirings and the number of controllers, reduce the weight of a body, and besides be manufactured at a low cost. SOLUTION: This multiaxial nut runner comprises an AC servo motor having a single drive shaft 18; a socket 4 to fasten a nut; and a clutch part 3 worked as an air clutch. The clutch part 3 independently of each other and intermittently transmit a power between a drive shaft 18 and each socket 4 by an air pressure fed from an external part of the body thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of sockets and a plurality of nuts or bolts (hereinafter simply referred to as "nuts").
That. ) Relates to a multi-axis nut runner that tightens in parallel.

[0002]

2. Description of the Related Art Conventionally, a multi-axis nut runner for tightening a plurality of nuts of this type in parallel has a plurality of sockets and the same number of motors as those sockets mounted on a main body.
That is, the conventional multi-shaft nut runner is provided with one motor for rotating the socket for each socket.

[0003]

However, in the conventional multi-shaft nut runner, one motor is provided for each socket and the socket is rotated, so that energy consumption is increased as a whole and the motor is connected to the motor as a whole. There is a problem that the number of wires to be connected and the number of controllers connected to the other end of the wires are also increased. Further, since a plurality of motors are mounted, there is a problem that the weight of the main body becomes heavy. In addition, there is a problem that the manufacturing cost increases.

An object of the present invention is to provide a multi-shaft nut runner which can be operated with low energy consumption, can reduce the number of wires and controllers, can reduce the weight of the main body, and can be manufactured at low cost.

[0005]

In order to achieve the above object, a multi-shaft nut runner according to claim 1 is provided on a main body.
In a multi-shaft nut runner that mounts a motor having two drive shafts and a plurality of sockets that rotate by receiving power transmission from the drive shaft of the motor and tightens nuts fitted to these sockets in parallel, The main body is provided with an air clutch for intermittently interrupting power transmission between the drive shaft and the sockets by air pressure supplied from outside the main body.

According to the multi-shaft nut runner of the first aspect, each socket fitted to the nut to be tightened receives power transmitted from one drive shaft of the motor via the air clutch and rotates. By the air pressure supplied from the outside of the main body, the power transmission between the drive shaft and each of the sockets is intermittently intermittently performed by the air clutch, so that each nut is tightened.

At this time, since the multi-shaft nut runner drives a plurality of sockets with one motor, it can be operated with less energy consumption than when one motor is provided for each socket. Since only one motor is required for each socket, the number of wires connected to the motor and the number of controllers connected to the other end of the wires can be reduced. In addition, the number of motors to be mounted is reduced,
The weight of the multi-shaft nut runner body can be reduced, and the cost of manufacturing the multi-shaft nut runner can be reduced.

A multi-shaft nut runner according to claim 2, wherein the air clutch has a shaft portion attached to a shaft of the socket so as to rotate concentrically and integrally with the socket in one direction parallel to the drive shaft. A spline socket and a piston which is moved in one direction by the air pressure in a state where one end is inserted into a socket portion of the spline socket, and is fitted in an outer periphery of a shaft of the piston. A transmission gear that meshes with a gear formed on the outer periphery of the drive shaft and rotates around the axis of the piston; and the one end of the piston slides in the one direction to the socket portion of the spline socket. A spline gear that is movably fitted and rotates integrally with the spline socket is attached, and the piston is connected to the spline socket. When the spline gears move away from each other, engagement portions formed on opposing surfaces of the spline gear and the transmission gear are engaged, and rotation of the drive shaft is transmitted from the transmission gear via the spline gear to the spline. It is transmitted to the socket. Claim 2
According to the multi-shaft nut runner, when the piston moves in a direction away from the spline socket with the one end of the piston inserted into the socket portion of the spline socket, the spline gear and the transmission gear are mutually connected. The engagement portion formed on the opposite surface of the drive shaft engages, and the rotation of the drive shaft is transmitted from the transmission gear to the spline socket via the spline gear. on the other hand,
When the piston moves in a direction to enter the spline socket, the engagement portions formed on the opposing surfaces of the spline gear and the transmission gear are separated from each other, so that the rotation of the drive shaft is interrupted and the rotation of the socket. Is stopped.
As described above, the engagement and disconnection of the engagement portion between the transmission gear and the spline gear is an intermittent operation of the air clutch. Therefore, the multi-shaft nut runner of claim 1 operates reliably, and the plurality of nuts can be tightened independently of each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiments of the present invention will be described below in detail.

FIG. 1 shows a multi-shaft nut runner 1 according to an embodiment.
Is shown. The main body 2 of this multi-shaft nut runner 1
The handle 5 has a switch lever 6 serving as a switch of the multi-shaft nut runner 1, the clutch 3 has a function as an air clutch, a socket 4 for tightening a nut, and one drive shaft 18 (FIG. 2). A)
A C servo motor 12 is mounted. Outside the main body 2, an air tank 9 for supplying air to the clutch unit 3 and a controller 7 as a control unit are provided.

The AC servomotor 12 has a torque sensor 10 for detecting the rotational force of a drive shaft 18 of the motor.
And an encoder 11 for detecting the rotation angle of the drive shaft 18. Then, the torque sensor 10 and the encoder 11 output signals representing the detected results to the controller 7.

The controller 7 controls the operation of the whole multi-shaft nut runner 1. For example, the AC servomotor 12 is started and stopped according to the ON / OFF of the switch lever, and the torque sensor 10 and the encoder 1
The opening and closing of the solenoid valve 8 is controlled based on the output signal of the first control signal.

FIG. 2 shows the structure of the socket 4 and the clutch unit 3 in detail. (For ease of understanding, the outer wall of the clutch unit 3 is partially removed.) The socket 4 includes a fitting unit 4a that fits a nut (not shown) and a sliding unit 4b. . Inside the sliding part 4b, a square hole penetrating from the fitting part 4a to the end of the sliding part movement 4b is formed. The shaft portion 17a of the spline socket 17 is fitted into this square hole. The shaft portion 17a protrudes through an end plate 22b that constitutes a part of the outer wall of the clutch portion 3, and has a bearing 24 provided in an annular groove 29 of the end plate 22b.
It is rotatably supported by. In addition, sliding part movement 4b
Is one direction parallel to the drive shaft 18 with respect to the shaft portion 17a (FIG. 2)
In the left-right direction). Further, the sliding portion 4b is provided between the fitting portion 4a and the end plate 22b.
A coil spring 28 is provided at a position surrounding the outer periphery of the coil spring 28. As shown in FIG. 3, three such sockets 4 are provided at an angular interval of 120 ° in the circumferential direction. Since these sockets 4 slide right and left and are urged toward the nut side by the repulsive force of the coil spring 28,
Even if the heights of the nuts are not uniform, they are firmly pressed against the nuts and fitted.

As shown in FIG. 2, the clutch portion 3 has a casing comprising a cylindrical tubular member 23 and disk-shaped end plates 22a and 22b for closing both ends of the tubular member 23. ing. In the casing, a rotary output shaft 21 fitted to the drive shaft 18, a piston 14, a transmission gear 15, a spline gear 16, and the above-described spline socket 17 including a shaft portion 17 a and a socket portion 17 b.
, A cylinder 26 having a shape of a bottomed cylinder, a spring 20, and bearings 24 and 25 are provided. In addition,
Each of the members 13, 14, 15, 16, 17, 26 is provided in a total of three sets, one set for each socket 4.

The end plate 22a of the clutch unit 3
, A main body of the AC servomotor 12 is attached. The drive shaft 18 of the AC servomotor 12 penetrates into the clutch unit 3 through a hole passing through the center of the end plate 22a. The drive shaft 18 is fitted with the rotation output shaft 21 and is aligned with the AC servomotor 12. The rotation output shaft 21 rotates concentrically and integrally with the drive shaft 18 in conjunction with the AC servomotor 12. The tip of the rotary output shaft 21 is
It is rotatably supported by a bearing 25 provided in a circular annular groove 27 passing through the center of 2b. The transmission gear 15 meshes with a gear formed on the outer periphery of the rotary output shaft 21. The transmission gear 15 is fitted around the shaft of the piston 14 and rotatably fitted around the shaft of the piston 14. Also, piston 1
The air receiving portion 14a formed at the right end of the fourth end plate 22a is inserted into the cylinder 26. The air receiving portion 14a has the shape of a bottomed cylinder and receives the pressure of air supplied from the air tank 9 through the air inlet 13. The air receiving portion 14a and the cylinder 26
The coil spring 20 is provided at a position surrounding the outer periphery of the shaft of the piston 14 between the bottom 26a and the bottom 26a. On the other hand, the left end 14b of the piston 14 is inserted into a cylindrical socket 17b. The spline gear 16 is attached to the left end 14b. The spline gear 16 is a socket portion 17 of a spline socket 17.
b and slidably fit in the left-right direction and rotate concentrically and integrally. The spline gear 16 and the transmission gear 1
A joint groove 15a and a protruding portion 16a are formed on each of the opposing surfaces 5. The joint groove 15a and the protrusion 16a
The respective opposing surfaces are formed so as to surround the axis of the piston 14. A spline formed on the outer periphery of the spline gear 16 meshes with a spline formed inside the socket 17b.

The pressure in the space 19 between the air inlet 13 and the air receiving portion 14a is at a high or low level by adjusting the air flowing from the air inlet 13.

When the pressure in the space 19 becomes low,
The coil spring 20 expands, and the piston 14 moves rightward, that is, moves away from the spline socket 17. As a result, the joint groove 15a and the projection 16a engage with each other, so that the transmission gear 15 and the spline gear 16 are engaged.
In this case, the rotation transmitted from the drive shaft 18 and the rotation output shaft 21 to the transmission gear 15 is transmitted to the spline gear 16 engaged with the transmission gear 15, and the spline gear 16
Is transmitted to the spline socket 17 which rotates integrally and concentrically. As a result, each of the sockets 4A, 4B, 4C fitted with the spline socket 17 rotates. Thus, the power of the drive shaft 18 is transmitted to the socket 4 via the clutch 3.

On the other hand, when the pressure in the space 19 becomes high, the piston 14 compresses the coil spring 20 and moves to the left, that is, into the spline socket 17. When the engagement between the joint groove 15a and the protruding portion 16a is released, the transmission gear 15 and the spline gear 16 are separated from each other. In this case, power transmission from the drive shaft 18 between the transmission gear 15 and the spline gear 16 is cut off, so that the sockets 4A, 4B, 4C do not rotate.

The multi-shaft nut runner 1 operates as follows as a whole. First, the AC servomotor 12 is in a stopped state, and the clutch unit 3 is in a disconnected state.

Specifically, the solenoid valve 8 is closed, and the air tank 9 cannot supply air to the clutch unit 3. Therefore, the air pressure in the space 19 in the cylinder 26 is at a low level. Since no pressure is applied to the air receiving portion 14a, the transmission gear 15 is kept in an extended state.
And the spline gear 16 are engaged. Next, the worker fits each of the sockets 4A, 4B, 4C into the nut and grips the switch lever 6 of the handle 5.
The switch of the multi-shaft nut runner 1 is turned on, and the controller 7 drives the AC servomotor 12. Since the transmission gear 15 and the spline gear 16 are engaged,
The power of the AC servomotor 12 is sequentially transmitted to the drive shaft 18, the rotation output shaft 21, the transmission gear 15, the spline gear 16, the spline socket 17, and the socket 4. Then, each of the sockets 4A, 4B, 4C rotates to seat the nut. When the nut fitted to each of the sockets 4A, 4B, 4C is seated, the rotation of all the sockets 4A, 4B, 4C is once stopped.

More specifically, the torque sensor 10 and the encoder 11 detect that the nut is seated on the drive shaft 18 and output the detection to the controller 7. The controller 7 receives an output signal representing the detection result. If the output signal is a signal indicating that the nut is seated, the controller 7 opens the solenoid valve 8. The air supplied from the air tank 9 via the solenoid valve 8 is supplied to the sockets 4A and 4A.
It flows into all the spaces 19 corresponding to B and 4C. Then, the air pressure in each space 19 becomes high, and the spline gear 16 is separated from the transmission gear 15. Since all the spline gears 16 and all the transmission gears 15 are separated, the rotation of all the sockets 4A, 4B, 4C is stopped. Next, each socket 4A, 4B, 4C is rotated one axis at a time, and the nut is further tightened.

Specifically, the controller 7 closes the solenoid valve 8 between the space 19 corresponding to the socket 4A and the air tank 9. Then, the flow of air from the air tank 9 is cut off by the solenoid valve 8, the air pressure in the space 19 becomes low, and the transmission gear 15 becomes the spline gear 16.
Engage with. The socket 4A rotates again to further tighten the nut. Then, the torque sensor 10 and the encoder 11 detect the optimum tightening of the nut from the drive shaft 18 and output it to the controller 7. In response to this output, the controller 7 opens the solenoid valve 8 to raise the air pressure in the space 19 to a high level. Transmission gear 15 and spline gear 1 again
6 is separated, and the socket 4A stops. Similarly, the respective nuts are further tightened by sequentially rotating the sockets 4B and 4C.

Incidentally, in order to enhance the tightening accuracy, this series of tightening operations may be repeated as necessary. When tightening of all nuts is completed, each socket 4A,
Remove 4B and 4C from the nut.

The multi-axis nut runner 1 has a socket 4A,
4B and 4C can be driven independently by one AC servomotor 12. Therefore, each socket 4
Operation can be performed with less energy consumption than when one AC servomotor 12 is provided for each of A, 4B, and 4C. Since only one motor is required for each of the sockets 4A, 4B, and 4C, the number of wires connected to the AC servomotor 12 and the controller 7 connected to the other end of the wires are not necessary.
Need to be small. In addition, since the number of mounted AC servomotors 12 is reduced, the weight of the main body 2 can be reduced, and the cost of manufacturing the multi-shaft nut runner 1 can be reduced.

[0025]

As is clear from the above, in the multi-shaft nut runner of the first aspect, the plurality of sockets can be tightened independently of each other by one motor, so that the operation can be performed with little energy consumption. Also, the multi-shaft nut runner of the present invention reduces the number of mounted motors,
The number of wires connected to the motor and the number of controllers connected to the other end of the wires can be reduced, the weight of the multi-shaft nut runner body can be reduced, and the cost of manufacturing the multi-shaft nut runner can be reduced.

Further, in the multi-shaft nut runner according to the second aspect of the present invention, the multi-shaft nut runner of the first aspect can be reliably operated to tighten a plurality of nuts independently of each other.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a multi-shaft nut runner according to an embodiment of the present invention.

FIG. 2 is a side view of a clutch portion of the multi-shaft nut runner.

FIG. 3 is a front view of the clutch unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Multi-axis nut runner 3 Clutch part 4 Socket 7 Controller 8 Solenoid valve 12 AC servomotor 14 Piston 15 Transmission gear 16 Spline gear 17 Spline socket

Claims (2)

[Claims] 1. A motor having one drive shaft in a main body,
A multi-shaft nut runner which mounts a plurality of sockets that rotate by receiving power transmission from a drive shaft of the motor and tightens nuts fitted to these sockets in parallel, A multi-shaft nut runner equipped with an air clutch for intermittently intermittently intermitting power transmission between the drive shaft and the sockets by air pressure supplied from the nut. 2. The multi-shaft nut runner according to claim 1, wherein the air clutch has a shaft portion on a shaft of the socket so as to rotate concentrically and integrally with the socket in one direction parallel to the drive shaft. An attached spline socket and a piston that is moved in the one direction by the air pressure in a state where one end is inserted into the socket portion of the spline socket are arranged in a line, and are provided around the shaft of the piston. A transmission gear that fits and meshes with a gear formed on the outer periphery of the drive shaft and rotates around the axis of the piston; and the one end of the piston, the socket of the spline socket, and the one-way A spline gear which fits slidably on the spline socket and rotates integrally with the spline socket is attached, and the piston is connected to the spline socket. When moving away from the spline gear, the engaging portions formed on the opposing surfaces of the spline gear and the transmission gear are engaged, and rotation of the drive shaft is transmitted from the transmission gear through the spline gear through the spline gear. A multi-shaft nut runner that is transmitted to a spline socket.