JP5035147B2 - Automatic screw tightening jig - Google Patents

Description

  The present invention relates to a jig for an automatic screw tightening device for preventing co-rotation of a workpiece when a nut is screwed into a screw portion provided on the workpiece and tightened.

  For example, Patent Document 1 has been proposed as a tightening device that fastens a driven pulley that is a component part of a belt-type torque transmission mechanism such as a motorcycle.

  Japanese Patent Application Laid-Open No. 2004-133867 discloses a driven pulley in a device in which a driven pulley is fitted to a rotatable driven shaft so as not to be relatively rotatable, and a bolt or a nut is fastened to an end of the driven shaft while the driven pulley is held unrotatable. It is intended to be applicable regardless of the model.

  Therefore, this apparatus is inserted into the jig block 54 of the tightening apparatus 51 shown in FIG. 5 into the socket wrench 55 for fastening bolts and the like, and the notched recess g of the driven pulley P shown in FIG. A plurality of locking pins 56 are provided, and each locking pin 56 is urged forward by a compression spring in the jig block 54, and is inserted into the jig block 54 when a pressing force is received from the front. . The position of the locking pin 56 is arranged at a position corresponding to the position of the notch recess g of a plurality of types of the driven pulley P.

JP 2001-47374 A, “Clamping device”

  When the driven pulley P and the bolt cannot be rotated relative to each other as in Patent Document 1 described above and the driven pulley P is provided with a rotation prevention catch (notch recess g), Patent Document 1 The socket wrench 55 can be tightened from above.

  On the other hand, generally, when a nut is screwed into a threaded portion provided on a certain workpiece and tightened, a tightening torque acts on the workpiece, so that it is necessary to prevent the workpiece from rotating together.

  In this case, in order to prevent co-rotation of the workpiece, a torque transmitting portion (for example, a hexagonal column shape) such as a bolt head is usually provided on the workpiece. However, it is very difficult to transfer a workpiece by a robot or the like and insert the torque transmission portion into a socket that fits the workpiece with a phase in the rotational direction (for example, each surface of a polygon). It was an obstacle to automatic tightening using

  The present invention has been developed to solve the above-described conventional problems. That is, it is an object of the present invention to easily adjust a torque transmission portion (for example, a hexagonal prism shape) provided on a work piece to prevent a co-rotation with a socket fitted to the workpiece and to adjust the phase in the rotation direction with a robot. Provided is a jig for an automatic screw tightening device that can be fitted and thereby can easily and surely prevent the torque transmission portion from co-rotating when a nut screwed into a threaded portion of a workpiece is tightened. There is.

According to the present invention, an automatic screw tightening device in which a work has a male screw portion and a torque transmission portion on the same axis, and prevents the torque transmission portion from rotating together when a nut screwed into the male screw portion is tightened. A jig for
A socket having a fitting hole that engages with the torque transmitting portion and stops rotation of the torque transmitting portion;
A linear guide that guides the socket movably along the axis while preventing rotation about the axis of the fitting hole;
An urging device that urges the socket toward the torque transmitting portion ;
The socket has a through hole extending along the axis of the fitting hole inside the fitting hole,
And a workpiece support pin that contacts the torque transmission portion and prevents movement to the socket side when the torque transmission portion is not fitted in the fitting hole. Tools are provided.

  According to a preferred embodiment of the present invention, there is provided a work guide for guiding the torque transmitting portion of the work concentrically with the fitting hole of the socket.

  The workpiece is moved concentrically by the robot with the torque transmission portion directed toward the fitting hole of the socket, and the nut screwed into the male screw portion by the robot with a predetermined torque while the torque transmission portion is in contact with the socket. Is driven to rotate.

  According to the configuration of the present invention, the socket is guided by the linear guide so as to be movable along the axis while preventing rotation of the fitting hole around the axis, and is directed toward the torque transmitting portion by the biasing device. If the torque transmission part and the circumferential position (phase) of the fitting hole coincide with each other by moving the torque transmission part of the workpiece concentrically toward the fitting hole of the socket by the robot, The torque transmission portion can be stopped by the socket that fits into the fitting hole and does not rotate around the shaft center.

  If the torque transmission portion and the circumferential position (phase) of the fitting hole do not match, the torque transmission portion moves against the socket and moves back against the biasing force of the biasing device. At the same time, the torque transmission part rotates together with the nut, so at the moment when the circumferential position (phase) of the torque transmission part and the fitting hole coincides, the fitting hole is fitted to the torque transmission part with a biasing force, The socket can stop the torque transmission portion from rotating together.

  Further, by providing a work guide for guiding the torque transmission portion of the workpiece concentrically with the fitting hole of the socket, the torque transmission portion of the workpiece and the fitting hole of the socket can be easily guided and held concentrically.

  Further, the socket has a through hole extending along the axis of the fitting hole, and further, when the torque transmission portion does not fit into the fitting hole, the socket contacts the torque transmission portion and moves toward the socket side. By providing a work support pin that prevents movement, the distance that the torque transmission part abuts on the socket is limited, and the torque transmission part continues to rotate at that position so that the torque transmission part and the fitting hole The frequency with which the circumferential position (phase) coincides can be increased, and the fitting hole can be securely fitted to the torque transmission portion with a biasing force, and the rotation of the torque transmission portion can be stopped by the socket.

  Therefore, the torque transmission part (for example, hexagonal column shape) provided in the workpiece to prevent co-rotation is rotated on the socket having the fitting hole to be engaged with the phase (for example, each surface of the polygon). Can be easily fitted by a robot, and when tightening a nut screwed into a threaded part of a workpiece, the torque transmitting part acting on the workpiece can be easily and reliably prevented from rotating together. Thus, reliable fastening can be realized.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

FIG. 1 is a configuration diagram of a work to which a jig for an automatic screw tightening device of the present invention is applied.
In this figure, the workpiece 1 has a male screw portion 2 and a torque transmission portion 3 on the same axis XX, and a nut 4 screwed to the male screw portion 2 is tightened to fasten the workpiece 1. It has become.

In this example, the work 1 is an electric motor (motor), and a motor rotor 5a is formed integrally with the rotating shaft 5b, and a torque transmitting portion 3 (in this example, a hexagonal prism shape) is formed on the top (lower end in the figure) of the rotating shaft 5b. Are integrally formed, and a male screw portion 2 is formed on the outer surface of the end portion (upper end portion in the figure) of the rotating shaft 5b.
In this figure, 6 is a motor stator, 7 is a pulley or gear, and with the motor stator 6 and the pulley or gear 7 inserted into the rotating shaft 5b, the nut 4 is screwed into the male screw portion 2, Assemble the entire motor. In this assembled state, the nut 4 holds the pulley or the gear 7, but the nut 4 is not tightened with a predetermined torque.

  Note that the present invention is not limited to the above-described workpiece, and is any other workpiece as long as it has a male screw portion 2 and a torque transmission portion 3 on the same axis and tightens a nut 4 screwed into the male screw portion 2. Also good.

In the present invention, the workpiece 1 is conveyed by the robot hands 8 and 9 of a robot (not shown) while the torque transmission portion 3 (in this example, a hexagonal column shape) is directed downward and the axis X is held vertically.
The present invention is not limited to this configuration, and the axis X may be transported while being held horizontally or obliquely other than vertical.
Moreover, it is not restricted to conveying with a robot, You may convey manually. Even when a person is transporting, it is effective because a person can save the trouble of aligning the hexagon at the top of the rotating shaft with the socket.

  Further, the robot moves while maintaining the concentricity of the torque transmitting portion 3 of the workpiece 1 toward the fitting hole 13 of the socket 12 of the present invention described later, and the torque transmitting portion 3 is in contact with the socket 12. The nut 4 screwed into the male screw portion 2 by the robot hand 9 is rotationally driven with a predetermined torque.

FIG. 2 is an overall configuration diagram of a jig for an automatic screw tightening device according to the present invention.
In this figure, the automatic screw tightening device jig 10 of the present invention includes a socket 12, a linear guide 14, a biasing device 16, a work guide 18, and a work support pin 20.

The socket 12 has a fitting hole 13 that can be fitted to the torque transmission portion 3 of the workpiece 1 and transmit the tightening torque transmitted from the torque transmission portion 3 to the main body 11a. When the torque transmission part 3 has a hexagonal prism shape, for example, the fitting hole 13 has a corner part that fits at least a part of its six apex angles, and fits with the torque transmission part 3 of the workpiece 1. The function to stop the rotation.
Further, the main body 11a is fixed to a fixed portion by holding its axis YY vertically with a bolt or the like (not shown).
Unlike this example, the upper portion of the socket 12 may be formed so as to be detachable, and the upper portion of the socket 12 may be exchanged in accordance with the shape or size of the torque transmitting portion 3 of the workpiece 1.

In this example, the linear guide 14 includes a spline that extends in the axial direction on the outer peripheral surface of the socket 12 and a spline nut that is provided on the inner surface of the main body 11a and engages with the spline. The spline is preferably formed integrally with the outer peripheral surface of the socket 12. The spline nut may be detachably attached to the inner surface of the main body 11a.
The linear guide 14 is not limited to a spline and a spline nut, but may have other configurations as long as the socket 12 can be guided to move along the axis Y while preventing rotation of the fitting hole 13 around the axis. For example, a sliding key or a known linear guide may be used.

  Further, in this example, the stopper plate 15 is a ring-shaped hollow disk, the outer peripheral portion is fixed to the main body 11a with bolts, the inner peripheral portion is in contact with a shoulder portion provided on the socket 12, and the socket 12 The upper limit position is set. The stopper plate 15 is not essential, and the socket 12 may be moved further upward.

In this example, the urging device 16 is a compression coil spring that is sandwiched between the upper portion of the sub-body 11b and the inside of the socket 12, and urges the socket 12 toward the torque transmitting portion (upward in the drawing). .
The stroke of the compression coil spring is larger than the depth of the fitting hole 13, and the urging force is preferably set smaller than the weight of the socket 12 but smaller than the weight of the workpiece 1.

  In this example, the sub-body 11b is concentrically attached with bolts from below the main body 11a. In addition, this invention is not limited to this structure, You may shape | mold the subbody 11b and the main body 11a integrally.

In this example, the work guide 18 is fixed to the upper part of the main body 11a, guides a part of the work (in this example, a part concentric with the axis Y), and connects the torque transmitting part 3 of the work 1 to the fitting hole of the socket 12. 13 is guided concentrically.
The work guide 18 is not indispensable, and may be omitted, and the torque transmitting portion 3 of the work 1 may be guided concentrically with the fitting hole 13 of the socket 12 by a robot. The work guide 18 may be formed integrally with the main body 11a.

  In this example, the socket 12 further has a through hole 12 a extending along the axis Y of the fitting hole 13 inside the fitting hole 13.

In this example, the work support pin 20 is detachably attached to the upper portion of the sub-body 11b, and when the torque transmission portion 3 does not fit into the fitting hole 13, it contacts the torque transmission portion 3 to the socket side. It is designed to prevent movement.
That is, in this example, the work support pin 20 is a vertical bar that is thinner than the through-hole 12a, the lower end is detachably attached to the upper portion of the subbody 11b, and the upper end surface is near the lower end of the fitting hole 13 at the upper limit position. Located in. The upper end surface of the work support pin 20 is formed in a convex shape with the center portion swelled upward, abuts against and supports the lower surface of the torque transmission portion 3, and supports the rotation of the torque transmission portion 3 with low resistance. It has become.

  3 is a diagram showing an operation state of the apparatus of FIG. 1, and FIG. 4 is a diagram showing an operation completion state of the apparatus of FIG.

  According to the configuration of the present invention described above, the socket 12 is guided by the linear guide 14 so as to be movable along the axis Y while preventing the rotation of the fitting hole 13 around the axis Y, and the biasing device 16. , The torque transmitting portion 3 of the workpiece 1 is concentrically directed toward the fitting hole 13 of the socket 12 by the robot hands 8 and 9 of the robot as shown in FIG. If the torque transmission part 3 and the fitting hole 13 are in the same position in the circumferential direction (phase) by moving (lowering vertically in this example), the torque transmission part 3 is fitted into the fitting hole 13, As shown in FIG. 4, the rotation of the torque transmitting portion 3 can be stopped by the socket 12 that does not rotate around the axis.

  If the circumferential position (phase) of the torque transmitting portion 3 and the fitting hole 13 do not match, the torque transmitting portion 3 contacts the socket 12 and moves downward as shown in FIG. Since the torque transmission part 3 rotates together with the nut 4 at the same time while retreating (lowering) against the urging force of the urging device 16, the circumferential position (phase) of the torque transmission part 3 and the fitting hole 13 is changed. At the moment of coincidence, as shown in FIG. 4, the fitting hole 13 is fitted into the torque transmission portion 3 by the urging force and rises, and the socket 12 can stop the rotation of the torque transmission portion 3.

  That is, when the workpiece 1 is loaded, if the hexagonal column shape 3 at the lower end of the shaft and the socket 12 are not in phase, the biasing device 16 (compression spring) is contracted by the workpiece's own weight, and the socket 12 moves downward. When the nut tightening is started, the shaft is rotated, and when the hexagonal prism shape 3 and the socket 12 are in phase, the socket 12 moves upward and engages with the hexagonal prism shape 3. After that, the rotation of the shaft is restrained and reliable tightening is performed.

  Further, by providing a work guide 18 that guides the torque transmitting portion 3 of the workpiece 1 concentrically with the fitting hole 13 of the socket 12, the torque transmitting portion 3 of the workpiece and the fitting hole 13 of the socket can be easily guided concentrically. Can be held.

  Furthermore, by providing the work support pin 20, the distance that the torque transmission part 3 moves in contact with the socket 12 and moves downward is limited, and the torque transmission part 3 continues to rotate at that position, so that the torque transmission part 3 3 and the circumferential position (phase) of the fitting hole 13 coincide with each other, and the fitting hole 13 is securely fitted to the torque transmitting portion 3 with a biasing force, and the torque transmitting portion 3 is rotated together by the socket 12. Can be stopped.

  Therefore, the torque transmission portion 3 (for example, hexagonal column shape) provided in the workpiece 1 to prevent co-rotation is aligned with the socket 12 having the fitting hole 13 for fitting with the torque transmission portion 3 (for example, hexagonal column shape). With this, when tightening a nut that is screwed into a threaded part of a workpiece, the torque transmitting part can easily and reliably prevent the torque transmission part from rotating together and securely. Can be achieved.

  In addition, this invention is not limited to embodiment mentioned above, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

It is a block diagram of the workpiece | work which applies the jig | tool for automatic screw fastening apparatuses of this invention. It is a whole block diagram of the jig for automatic screw fastening devices by the present invention. It is a figure which shows the operating state of the apparatus of FIG. It is a figure which shows the operation completion state of the apparatus of FIG. It is a schematic diagram of the apparatus of patent document 1. FIG. It is a schematic diagram of the object which applies the apparatus of patent document 1. FIG.

Explanation of symbols

1 work, 2 male screw part,
3 Torque transmission part (hexagonal column shape), 4 nut,
5a motor rotor, 5b rotating shaft,
6 Motor stator, 7 Pulley or gear,
8,9 Robot hand,
10 Jig for automatic screw tightening device,
11a main body, 11b subbody,
12 sockets, 13 mating holes,
14 Linear guide (spline and spline nut),
15 stopper plate, 16 biasing device (compression coil spring),
18 Work guide, 20 Work support pin

Claims (3)

A jig for an automatic screw tightening device, wherein a work has a male screw part and a torque transmission part on the same axis, and prevents the torque transmission part from rotating together when tightening a nut screwed into the male screw part. ,
A socket having a fitting hole that engages with the torque transmitting portion and stops rotation of the torque transmitting portion;
A linear guide that guides the socket movably along the axis while preventing rotation about the axis of the fitting hole;
An urging device that urges the socket toward the torque transmitting portion ;
The socket has a through hole extending along the axis of the fitting hole inside the fitting hole,
And a workpiece support pin that contacts the torque transmission portion and prevents movement to the socket side when the torque transmission portion is not fitted in the fitting hole. Ingredients.   The jig for an automatic screw tightening device according to claim 1, further comprising a work guide for guiding a torque transmission portion of the work concentrically with a fitting hole of the socket.   The workpiece is moved concentrically by the robot with the torque transmission portion directed toward the fitting hole of the socket, and the nut screwed into the male screw portion by the robot with a predetermined torque while the torque transmission portion is in contact with the socket. The jig for an automatic screw tightening device according to claim 1, wherein the jig is driven by rotation.

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