JP2016059988A - Fastening mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily hold a fastened member without magnetization and fasten the fastened member to a fastening target member.SOLUTION: A fastening mechanism 1 rotates a bolt B and threads a screw section Ba of the bolt B with a screw hole Ma of a fastening target member M, and comprises: a gear 3b receiving rotating power and rotating; a gear 3c which is disposed to differ from the gear 3b in rotational axis center and which rotates by transmitting the rotating power to the gear 3c from the gear 3b; a socket 4 which is provided on the gear 3c and which holds the bolt so that a rotational axis of the gear 3c matches a rotational axis of the bolt; and an anti-detachment section 5 moving between a prevention position at which the anti-detachment section 5 prevents the detachment of the bolt from the socket and a standby position which is outward, in a radial direction of the gear 3c, of the prevention position and at which the anti-detachment section 5 allows the separation of the bolt from the socket in a state in which the bolt held by the socket can rotate and the screw section of the bolt can be threaded with the screw hole of the fastening target member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastening mechanism in which rotational power for rotating a fastening member is transmitted via a plurality of rotating bodies.

  Conventionally, so-called offset gears are used to fasten fastening members such as bolts and nuts in narrow places. For example, as shown in Patent Document 1, an offset gear is provided with an input gear to which rotational power from a drive source such as a motor is transmitted, and a socket gear for holding a fastening member. Rotational power is transmitted from the socket gear to the socket gear. In the offset gear, since the drive source is arranged on the input gear side, the socket gear side can be reduced in size, and the fastening member can be fastened in a narrow place.

JP 2012-86280 A

  By the way, a socket into which a fastening member is fitted is formed in the socket gear, and the fastening member is moved to the fastened member while being fitted into the socket. At this time, depending on the direction of the fastening member when fastening to the fastened member, the fastening member may fall off the socket. Therefore, it is conceivable to magnetize the fastening member and hold the fastening member in the socket by magnetic force. However, there is a concern that the fastening member must be magnetized and foreign matter adheres to the fastening member. .

  The objective of this invention is providing the fastening mechanism which can hold | maintain a fastening member easily, without magnetizing, and can fasten to a to-be-fastened member.

  In order to solve the above problem, the fastening mechanism of the present invention, in which the fastening member is rotated and the screwed portion of the fastening member is screwed into the screwed portion of the fastened member, is rotated by receiving rotational power. A first rotating body, a second rotating body that is arranged with a rotational axis center different from that of the first rotating body, is rotated by transmission of rotational power from the first rotating body, and is provided in the second rotating body; A holding part for holding the fastening member by matching the rotation axis of the body with the rotation axis of the fastening member, rotation of the fastening member held by the holding part, and screwing of the fastening part and the fastening member A preventive position for preventing the fastening member from dropping off from the holding part in a state in which the joint part can be screwed, and a radially outer side of the second rotating body from the preventive position, from the holding part for the fastening member And a drop-off prevention unit that moves between a standby position that allows detachment of.

  An actuator for reciprocating the drop-off prevention unit between the standby position and the prevention position may be further provided.

  You may further provide the motor which rotationally drives a 1st rotary body.

  According to the present invention, the fastening member can be easily held without being magnetized and fastened to the fastened member.

It is a perspective view of a fastening mechanism. It is a top view of a fastening mechanism. It is a side view of a fastening mechanism. It is explanatory drawing for demonstrating the structure and operation | movement of a drop-off prevention part.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a perspective view of the fastening mechanism 1, FIG. 2 is a top view of the fastening mechanism 1, and FIG. 3 is a side view of the fastening mechanism 1. The fastening mechanism 1 is an electric tool that rotates the bolt B (fastening member) to screw the screw portion Ba (screwed portion) of the bolt B into the screw hole Ma (screwed portion) of the fastened member M. is there.

  As shown in FIG. 1, the fastening mechanism 1 includes a nut runner 2 (motor). The nutrunner 2 is driven by electric power or air pressure. An offset gear 3 is connected to the nut runner 2.

  The offset gear 3 is configured by incorporating a plurality of gears 3b to 3d inside a housing 3a. The gears 3b to 3d maintain the meshed state, and as shown in FIG. 2, the gears 3b to 3d are arranged in a straight line from the right end gear 3b (first rotating body) to the left end gear 3c (second rotating body) in FIG. Has been. That is, the gear 3c is arranged with the rotation axis center different from that of the gear 3b.

  As shown in FIGS. 1 and 3, one end of a shaft 3e is fixed to the rightmost gear 3b so as to be coaxial with the rotation axis of the gear 3b. The other end side of the shaft 3 e is inserted into a connection hole (not shown) provided in the nut runner 2.

  When the nutrunner 2 is driven, rotational power is transmitted from the nutrunner 2 through the shaft 3e to the gear 3b. Then, rotational power is transmitted from the gear 3b to the gear 3c via another gear 3d located between the gear 3b and the gear 3c, and the gear 3c rotates.

  The socket 4 (holding portion) is formed of, for example, an annular member, and is disposed on the lower side of the gear 3c in FIG. The socket 4 is fixed to the gear 3c and rotates integrally with the gear 3c. Inside the socket 4, a holding hole 4a having a hexagonal cross section perpendicular to the rotation axis of the socket 4 is provided, and the head Bb of the bolt B is fitted into the holding hole 4a.

  And when the head Bb of the volt | bolt B is engage | inserted, the socket 4 hold | maintains the volt | bolt B in the state which made the rotating shaft of the socket 4 and the rotating shaft of the volt | bolt B correspond.

  When the nut runner 2 is driven while the bolt B is held in the socket 4, the gear 3c rotates as described above, and the socket 4 fixed to the gear 3c rotates integrally with the gear 3c. As a result, the bolt B rotates as the socket 4 rotates.

  Further, the fastening mechanism 1 of the present embodiment includes a dropout prevention unit 5 that prevents the bolt B held by the socket 4 from dropping off. Hereinafter, the configuration and operation of the dropout prevention unit 5 will be described in detail with reference to FIG.

  FIG. 4 is an explanatory diagram for explaining the configuration and operation of the drop-off prevention unit 5, and shows a perspective view of the fastening mechanism 1 as seen from the direction of the white arrow in FIG. 3. As shown in FIG. 4, the drop-off prevention part 5 is a plate-like member, and the tip side is generally U-shaped.

  The base end side of the drop-off prevention unit 5 is connected to an actuator 6 fixed to the housing 3 a of the offset gear 3. The dropout prevention unit 5 receives the power of the actuator 6 and reciprocates in the direction indicated by the white arrow in FIGS. 4 (b) and 4 (d).

  The operation of the drop-off prevention unit 5 will be described. First, as shown in FIG. 4A, the head Bb of the bolt B is fitted into the holding hole 4a of the socket 4 with the bolt B and the washer W assembled. . At this time, the drop-off prevention unit 5 stands by at a standby position that allows the bolt B to be detached from the socket 4, in other words, at a position where the holding hole 4a of the socket 4 is completely exposed.

  And as shown in FIG.4 (b), when the actuator 6 drives, the drop-off prevention part 5 moves to the direction shown by the white arrow in FIG.4 (b). As described above, the drop-off prevention portion 5 has a generally U-shaped tip side, and the screw portion Ba of the bolt B is accommodated in the U-shaped recess 5a. At this time, the recess 5a of the drop-off prevention part 5 and the threaded part Ba of the bolt B are maintained in a non-contact state.

  Then, as shown in FIG. 4C, the drop-off prevention unit 5 stops at a prevention position that prevents the drop of the bolt B from the socket 4 (see FIG. 4A). Here, the standby position is located radially outward of the bolt B (gear 3c) with respect to the prevention position. The drop-off prevention unit 5 moves inward in the radial direction of the bolt B from the standby position toward the prevention position.

  When the drop-off prevention part 5 moves to the prevention position, the bolt B is supported by the drop-off prevention part 5 via the washer W, and the movement in the direction indicated by the dashed arrow in FIG. Dropping from the socket 4 (see FIG. 4A) is prevented. In addition, the washer W is also supported by the drop-off prevention part 5 and is prevented from falling off from the bolt B.

  However, the drop-off prevention unit 5 is separated from the holding hole 4a of the socket 4 by a thickness greater than the thickness of the washer W at the prevention position, and the washer W has play in the direction of the rotation axis of the bolt B. Therefore, the bolt B is also held in the holding hole 4a with play in the direction of the rotation axis. Further, the separation distance between the drop-off prevention unit 5 and the holding hole 4a of the socket 4 is smaller than the thickness (the length in the rotation axis direction) of the head Bb of the bolt B. Therefore, when the drop-off prevention part 5 is in the prevention position, the bolt B has play in the direction of the rotation axis in a state where the head Bb is held in the holding hole 4a. As a result, the bolt B is prevented from falling off the holding hole 4a without being prevented from rotating by the drop-off preventing portion 5. In other words, the drop-off prevention part 5 is in a state in which the bolt B held by the socket 4 can be rotated and the screw part Ba of the bolt B and the screw hole Ma of the fastened member M can be screwed together. This prevents the bolt B and washer W from falling off.

  Then, in the state shown in FIG. 4C, the entire fastening mechanism 1 is moved so that the tip of the screw portion Ba of the bolt B is brought into contact with the screw hole Ma of the member M to be fastened. Then, the nut runner 2 is driven, the screw portion Ba of the bolt B is screwed into the screw hole Ma of the fastened member M, and the bolt B and the washer W are temporarily tightened to the screw hole Ma.

  Thereafter, the drop-off prevention unit 5 is moved to the standby position by the actuator 6 while the nutrunner 2 is driven as shown by the white arrow in FIG. 4D, and the bolt B is moved as shown in FIG. Then, the washer W is finally tightened into the screw hole Ma.

  As described above, the fastening mechanism 1 includes the drop-off prevention unit 5, so that the bolt B held by the socket 4 is prevented from dropping from the socket 4. Therefore, the bolt B is stably held in the socket 4, and the operator does not need to be aware of avoiding the dropout of the bolt B, thereby improving workability. Further, in order to prevent the bolt B from falling off, a process such as magnetizing the bolt B is not required, and adhesion of foreign matter to the bolt B is avoided.

  In the embodiment described above, the drop-off prevention unit 5 is a prevention position for preventing the bolt B from dropping from the socket 4, and is radially outward of the gear 3 c from the prevention position, and the bolt B is detached from the socket 4. The case of moving between the standby positions that allow the above has been described. Thus, when the bolt B is fastened to the fastened member M by setting the standby position to be radially outward of the gear 3c from the prevention position, the drop-off prevention part 5 is fastened to the head Bb of the bolt B. The bolt B can be reliably fastened to the fastened member M without being interposed between the members M.

  Further, in the above-described embodiment, a case has been described in which the drop prevention unit 5 includes the actuator 6 that reciprocates between the standby position and the prevention position. However, the drop-off prevention unit 5 may be manually reciprocated without providing the actuator 6. However, by providing the actuator 6, the movement of the drop-off prevention unit 5 can be quickly performed, and a synergistic effect with improvement in workability by providing the drop-off prevention unit 5 can be expected.

  In the above-described embodiment, the case where the nut runner 2 that rotationally drives the gear 3b is provided has been described. However, the structure which rotates the gear 3b manually without providing the nut runner 2 may be sufficient. However, by providing the nut runner 2, the fastening of the bolt B can be quickly performed, and a synergistic effect with improvement in workability due to the provision of the drop-off prevention unit 5 can be expected.

  Further, in the above-described embodiment, the case where the fastening mechanism 1 holds the bolt B in the socket 4 and is screwed into the screw hole Ma has been described. However, the fastening mechanism 1 may hold the nut in the socket 4 and screw it into a screw such as a bolt, for example. In this case, the nut is a fastening member, the screw groove formed on the inner periphery of the nut is a screwed portion, the bolt to which the nut is screwed is a member to be fastened, and the screw groove formed on the bolt is the screwed portion. .

  Moreover, although the embodiment mentioned above demonstrated the case where the washer W was attached to the volt | bolt B and fastened to the screw hole Ma, the washer W is not an essential structure. Further, the bolt B and the washer W may be integrally formed in advance. Further, the washer W may be a spacer or an arbitrary intermediate member.

  Moreover, although the fastening mechanism 1 demonstrated the case where it was an electric tool in embodiment mentioned above, you may incorporate in the mechanical apparatus provided with the movable stage etc., for example.

  In the above-described embodiment, the case where the bolt B is temporarily tightened to the screw hole Ma after the bolt B is temporarily tightened and then the drop-off prevention unit 5 is moved to the standby position is described. Instead of tightening, the drop-off prevention unit 5 may be moved to the standby position, and the bolt B may be finally tightened into the screw hole Ma.

  In the above-described embodiment, the gears 3b and 3c have been described as examples of the first rotating body and the second rotating body. However, any configuration other than a gear may be used as long as rotational power can be transmitted. .

  In the above-described embodiment, the case where the holding hole 4 a formed inside the socket 4 has a hexagonal cross-sectional shape perpendicular to the rotation axis of the socket 4 has been described. However, if the socket 4 can hold the bolt B in a state in which the head Bb of the bolt B is fitted in the holding hole 4a and the rotating shaft of the socket 4 and the rotating shaft of the bolt B are matched, the holding hole 4a is, for example, Any other shape such as a hex lobe shape may be used.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  The present invention can be used for a fastening mechanism in which rotational power for rotating a fastening member is transmitted via a plurality of rotating bodies.

B Bolt (fastening member)
Ba threaded part (threaded part)
M Fastened member Ma Screw hole (screwed part)
1 Fastening mechanism 2 Nutrunner (motor)
3b Gear (first rotating body)
3c Gear (second rotating body)
4 Socket (holding part)
5 Fallout prevention part 6 Actuator

Claims (3)

A fastening mechanism that rotates a fastening member to screw a screwed portion of the fastening member into a screwed portion of a fastened member,
A first rotating body that rotates by receiving rotational power;
A second rotating body that is arranged with a rotational axis center different from that of the first rotating body, and that rotates by receiving rotational power from the first rotating body;
A holding portion that is provided in the second rotating body and holds the fastening member by aligning the rotating shaft of the second rotating body and the rotating shaft of the fastening member;
The fastening member from the holding portion in a state in which the fastening member held by the holding portion can rotate and the screwed portion of the fastening member and the screwed portion of the fastened member can be screwed together. A dropout that moves between a prevention position for preventing the dropout and a standby position that is radially outward of the second rotating body from the prevention position and that allows the fastening member to be detached from the holding portion. A prevention unit;
A fastening mechanism comprising:   The fastening mechanism according to claim 1, further comprising an actuator that reciprocates the drop-off prevention unit between the standby position and the prevention position.   The fastening mechanism according to claim 1, further comprising a motor that rotationally drives the first rotating body.

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