JP6164233B2 - Bolt tightening device and socket - Google Patents

Description

  The present invention relates to a bolt fastening device and a socket technology.

Conventionally, in order to fasten members using bolts, a bolt fastening device which is a device for fastening a bolt screwed into a bolt hole has been widely used.
When tightening the bolt, if the socket of the bolt tightening device and the bolt hole to which the bolt or bolt is screwed are tilted or misaligned with each other, the head of the bolt does not enter the socket and turns freely. Bolt tightening may fail.

Therefore, conventionally, in order to prevent failure of bolt tightening by the bolt tightening device, a configuration is known in which a groove for increasing the frictional force against the head of the bolt is provided at the end edge of the socket, For example, the technique is disclosed in Patent Document 1 shown below.
In the conventional bolt tightening device disclosed in Patent Document 1, the bolt and the bolt hole are inclined or displaced with respect to the axial direction of the socket by rotating the bolt by the frictional force generated in the socket groove. Even so, the bolt can be rotated and the bolt can be tightened.

  However, if a groove is provided only at the edge of the socket, the frictional force generated between the edge of the socket and the head of the bolt becomes unstable, making it difficult to rotate the bolt reliably. Tightening could fail.

JP-A-9-183026

  The present invention has been made in view of such a current problem, and even if the axial direction of the socket does not coincide with the axial direction of the bolt or the bolt hole, the bolt is securely tightened. The aim is to provide a bolting device and socket that can be successful.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, a bolt fastening device according to the present invention includes a rotary shaft that is rotationally driven, and a socket that is attached to an end of the rotary shaft and has an engagement hole for engaging a bolt. A bolt tightening device, wherein an end edge of the socket on the side where the engagement hole is opened is a single protrusion that partially protrudes the end edge in the axial direction of the socket. And a non-protruding portion having no protrusion.

  In the bolt tightening device according to the present invention, the protrusion includes a tapered portion that decreases the protrusion height of the protrusion toward the inside in the rotational radius direction.

  The bolt tightening device according to the present invention is connected to the rotary shaft so as to be swingable, and has an extension shaft extending the rotary shaft, and an inner diameter dimension larger than a shaft diameter of the extension shaft, And a sleeve for covering the extension shaft, wherein the swinging range of the extension shaft is regulated by the sleeve.

  The socket according to the present invention is a bolt fastening socket provided with an engagement hole for engaging a bolt, which is attached to the rotating shaft of the bolt fastening device. The end edge on the opening side is composed of a single protrusion having the end edge partially protruded in the axial direction of the socket and a non-projection having no protrusion. It is characterized by.

  Further, in the socket according to the present invention, the protrusion includes a tapered portion that decreases the protrusion height of the protrusion toward the inner side in the radial direction of rotation.

  As effects of the present invention, the following effects can be obtained.

  According to the bolt tightening device of the present invention, the bolt can be securely tightened by reliably correcting the inclination of the bolt with respect to the axial direction of the socket.

  Further, according to the bolt tightening device according to the present invention, by further correcting the inclination of the socket with respect to the bolt and the bolt hole, the bolt can be tightened more reliably and the socket can be secured around the tightening portion. Since contact with other parts is suppressed, it is possible to suppress damage to the workpiece in the bolt tightening operation.

  Further, according to the socket of the present invention, the bolt can be securely tightened by reliably correcting the inclination of the bolt with respect to the axial direction of the socket.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The perspective schematic diagram which shows the bolt fastening apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the socket which comprises the bolt fastening apparatus which concerns on one Embodiment of this invention, (a) Side surface schematic diagram, (b) Front surface schematic diagram. The perspective schematic diagram which shows the socket which comprises the bolt fastening apparatus which concerns on one Embodiment of this invention. The side cross-sectional schematic diagram which shows the bolting condition of the volt | bolt by the volt | bolt clamping apparatus which concerns on one Embodiment of this invention. Explanatory drawing of the floating mechanism in the bolt fastening apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the bolting condition of the volt | bolt by the volt | bolt clamping apparatus which concerns on one Embodiment of this invention.

Next, embodiments of the invention will be described.
First, an overall configuration of a bolt fastening device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, a bolt tightening device 1 according to an embodiment of the present invention includes a motor 2, an extension shaft 3, a socket 4, a sleeve 5, and a support plate 6.

  As shown in FIG. 2, the bolt tightening device 1 is a device used for tightening the bolt 10 to the tightening portion 20, and the bolt 10 can be inserted into the tightening portion 20 and temporarily arranged. A tubular collar 21 is arranged. When the bolt 10 is just inserted into the collar 21, the bolt 10 is not yet screwed into the bolt hole 22 (see FIG. 7) formed at the bottom of the collar 21, and the axial direction of the collar 21. It is possible to take an inclined posture.

As shown in FIG. 1, the motor 2 is a drive source for rotationally driving the extension shaft 3 and the socket 4, and includes a motor shaft 2a that rotates when energized.
The motor shaft 2a is provided with a drive angle 2b, which is a prismatic convex portion, at its tip, and a ball-shaped latch for locking the extension shaft 3 is provided on the drive angle 2b.

  The motor 2 is fixed to a surface on one side (the upper side in FIG. 1) of the support plate 6 with the motor shaft 2 a inserted through a hole 6 a formed in the support plate 6.

  The extension shaft 3 is a shaft member that connects the motor shaft 2a and the socket 4, and includes an insertion angle 3a that is a square hole-shaped recess corresponding to the drive angle 2b at one end and the socket 4 at the other end. A drive angle 3b, which is a prismatic convex portion to be engaged, is provided. A groove (not shown) for locking the ball-shaped latch of the drive angle 2b is formed on the inner surface of the insertion angle 3a, and the socket 4 is locked to the drive angle 3b. A ball-shaped latch is provided.

  The socket 4 is a part that engages with the head 10a of the bolt 10 to be tightened, and as shown in FIGS. 3 (a) and 3 (b) and FIG. 4, at the end edge 4a on the side facing the bolt 10. , A protrusion 4b which is a portion protruding from the end edge 4a is provided.

  The socket 4 has a single protrusion 4b formed on a part of the edge 4a, and a portion of the edge 4a where the protrusion 4b is not formed protrudes by the edge 4a. A non-projecting part (called a non-projection part) is formed.

  The protruding portion 4b is formed in an arc shape along the periphery of the engaging hole 4e at the end edge portion 4a, and a tapered portion 4c is formed on the inner side surface of the protruding portion 4b in the radial direction. Step portions 4d and 4d are formed at the end of the protrusion 4b in the circumferential direction.

The taper portion 4c has a shape obtained by cutting a part of the bowl-shaped curved surface, and is inclined so that the distance from the axis X to the projection portion 4b increases from the base side to the top side of the projection portion 4b. In addition, the curved surface is curved in an arc shape toward the rotation circumferential direction of the socket 4.
In the socket 4, the width in the radial direction of the top of the protrusion 4b is made smaller than the width of the edge 4a, and the width in the radial direction of the base of the protrusion 4b is made smaller than the width of the edge 4a. And a tapered portion 4c is formed on the inner side surface of the protruding portion 4b in the radial direction.

  The protrusion 4b is a part formed on a part of the end edge 4a (about half of the end edge 4a in the present embodiment), and the formation range thereof is the shape of the bolt 10 or the rotation speed of the socket 4. It selects suitably according to conditions, such as.

  The stepped portion 4d is preferably constituted by a surface inclined so as to expand the formation range of the protruding portion 4b from the end surface of the protruding portion 4b toward the end edge portion 4a in the rotational circumferential direction of the socket 4. The step portion 4d may be configured by a surface that intersects the end surface of the projection 4b and the end edge portion 4a perpendicularly.

  Then, an appropriate value corresponding to conditions such as the shape of the bolt 10 and the rotational speed of the socket 4 is selected as the protrusion height h of the protrusion 4b and the inclination angle θ of the step 4d (see FIG. 3A). As a result, the success probability of the tightening operation of the bolt 10 by the socket 4 can be improved.

Further, the socket 4 includes a substantially hexagonal engagement hole 4e corresponding to the head portion 10a of the bolt 10 (that is, slightly larger than the size of the head portion 10a), and at the drive angle 3b of the extension shaft 3. Corresponding (that is, slightly larger than the dimension of the drive angle 3b) is provided with an insertion angle 4f which is a concave portion having a square hole shape.
A groove (not shown) for locking the ball-shaped latch of the drive angle 3b is formed on the inner surface of the insertion angle 4f of the socket 4.
With such a configuration, the socket 4 can be easily attached to the end of the extension shaft 3 by inserting the drive angle 3b of the extension shaft 3 into the insertion angle 4f, and the socket 4 in the attached state can be mounted. By pulling in a direction away from the extension shaft 3, the extension shaft 3 can be easily removed.

  In this embodiment, the configuration in which the socket 4 is connected to the motor shaft 2a via the extension shaft 3 is illustrated. However, the socket 4 according to an embodiment of the present invention is directly connected to the motor shaft 2a. Can also be used.

  And the socket 4 provides the taper part 4c, and when the head part 10a of the volt | bolt 10 is addressed to the inner side (inner peripheral surface side) of the projection part 4b, the head part 10a pressed by the taper part 4c. Is displaced (aligned) toward the axis X of the socket 4, so that the head 10a is easily engaged with the engagement hole 4e. Further, in the socket 4, a second taper portion 4g for facilitating engagement of the head portion 10a with the engagement hole 4e is further formed on the inner peripheral surface in a range from the end edge portion 4a to the engagement hole 4e. Has been. Note that the end edge portion 4a includes an end edge portion 4a located in a range where the protruding portion 4b is formed.

The sleeve 5 is a substantially tubular member that covers the extension shaft 3, and in a state where the extension shaft 3 is mounted, the sleeve 5 is on the side opposite to the surface on which the motor 2 is attached (the lower side in FIG. 1). It is fixed to the surface.
A gap is provided between the inner peripheral surface of the sleeve 5 and the outer peripheral surface of the extension shaft 3.

  In the bolt tightening device 1, the motor shaft 2a, the extension shaft 3, the socket 4, and the sleeve 5 are arranged so that the axes of the motor shaft 2a and the sleeve 5 are aligned with each other on the axis X. By rotating and driving, the socket 4 can be rotated around the axis X via the extension shaft 3.

  The bolt tightening device 1 is supported so that the support plate 6 can be displaced with at least a three-dimensional degree of freedom by a displacement device (not shown), and the bolt 10 is tightened at the tightening position (the tightening portion 20). The bolt fastening device 1 is displaced to a corresponding position, and the bolt fastening device 1 can be displaced up and down according to the tightening state of the bolt 10.

Next, the tightening condition of the bolt 10 by the bolt tightening device 1 will be described with reference to FIG.
Here, the rotational axis X of the bolt tightening device 1 and the axial center Z of the collar 21 into which the bolt 10 is inserted are coincident with each other, and the axial center Y of the bolt 10 is The case where the bolting operation of the bolt 10 by the bolt tightening device 1 is started in a state where it is inclined with respect to the axis Z is illustrated. The axis Z of the collar 21 coincides with the axis of the bolt hole 22 (not shown here, see FIG. 7).

  As shown in FIG. 5, when the bolt tightening device 1 is screwed into a bolt hole 22 (not shown) and tightened with a bolt 10 in which the axis Y is inclined with respect to the axis X, the head When the socket 4 is rotated around the axis X in a state where the edge 4a of the socket 4 is in contact with 10a, the projection 4b (more specifically, the step 4d) of the socket 4 causes the head 10a to move. The side surface can be pressed toward the rotation circumferential direction.

  At this time, the bolt 10 is pressed by the protrusion 4b, whereby the inclination angle of the axis Y is changed, and the angle at which the head 10a gradually fits inside the protrusion 4b in the socket 4 as the socket 4 rotates. (The inclination angle of the axis Y of the bolt 10 with respect to the axis X becomes small).

When the socket 4 is further rotated in a state where the head portion 10a is inside the protruding portion 4b, the head portion 10a of the bolt 10 is aligned by the taper portion 4c, and the axis of the axis Y of the bolt 10 is aligned. The inclination angle with respect to the center X is further reduced, and the head 10a is finally accommodated in the engagement hole 4e, so that the bolt 10 is engaged with the socket 4.
In a state where the bolt 10 is engaged with the socket 4, the shaft center X of the bolt fastening device 1, the shaft center Z of the collar 21, and the shaft center Y of the bolt 10 are in agreement.

  When the shaft centers X, Y, and Z coincide with each other, the bolt tightening operation by the bolt tightening device 1 can be stably performed, and the bolt hole 22 can be generated without causing a tightening failure. The bolt 10 can be tightened against (not shown).

  Note that the stepped portion 4d of the protruding portion 4b of the socket 4 has both end portions in the rotational circumferential direction of the protruding portion 4b so that the bolt 10 can be caused to act both when the socket 4 is rotated forward and backward. It is preferable to provide in.

  That is, the bolt tightening device 1 according to an embodiment of the present invention engages the motor shaft 2a that is a rotational shaft that is rotationally driven and the bolt 10 that is attached to the drive angle 2b at the end of the motor shaft 2a. Socket 4 according to an embodiment of the present invention in which an engagement hole 4e is formed, and an end edge portion 4a of the socket 4 on the side where the engagement hole 4e is opened is The edge part 4a is comprised from the single protrusion part 4b which protruded partially in the axial center direction of the socket 4, and the non-protrusion part which does not have a protrusion.

  In the bolt tightening device 1 according to the embodiment of the present invention, the protrusion 4b of the socket 4 includes a taper 4c that decreases the protrusion height of the protrusion 4b toward the inside in the rotational radius direction. Yes.

  And in the bolt fastening apparatus 1 provided with the socket 4, since the inclination of the bolt 10 with respect to the axial direction of the socket 4 can be reliably corrected by such a configuration, the bolt 10 is securely tightened. Can do.

Next, the floating mechanism provided in the bolt tightening device 1 will be described with reference to FIGS. 6 and 7.
The bolt tightening device 1 includes a mechanism (so-called floating mechanism) that enables the extension shaft 3 that supports the socket 4 to swing.
In the bolt tightening device 1, as shown in FIG. 6, the motor shaft 2 a and the extension shaft 3 are connected to the drive angle 2 b of the motor shaft 2 a while providing play with the insertion angle 3 a of the extension shaft 3. The connecting portion (the latching portion of the ball-shaped latch by the groove portion) is used as a fulcrum, and the extension shaft 3 is configured to be swingable, and the swinging range of the extension shaft 3 is regulated by the sleeve 5, thereby allowing the floating mechanism Is configured.

Here, the effect of the floating mechanism will be described.
Here, with respect to the tightening condition of the bolt 10 by the bolt tightening device 1, the rotation axis X of the bolt tightening device 1 coincides with the shaft center Z of the collar 21 and the bolt hole 22 provided with the bolt 10 at the tightening position. A case where the bolt 10 is tightened from a state where the bolt is not tightened will be described as an example.

As shown in FIG. 6, the bolt fastening apparatus 1 is configured such that the extension shaft 3 and the socket 4 can be swung with respect to the motor shaft 2a.
That is, in the bolt tightening device 1, the axis X (here called the axis X1) of the extension shaft 3 and the socket 4 is set to the axis X (here called the axis X2) of the motor shaft 2a. Can be inclined.

  In the bolt fastening device 1, the extension shaft 3 is swung by, for example, pressing the socket 4 against the bolt 10 by a displacement device (not shown).

In the bolt tightening device 1, the extension shaft 3 is covered by the sleeve 5, and the shaft diameter (outer diameter dimension) φd of the extension shaft 3 is made smaller than the inner diameter dimension φD of the sleeve 5. In this configuration, there is a margin for swinging the extension shaft 3.
When the extension shaft 3 is swung and the inclination angle of the shaft center X1 with respect to the shaft center X2 becomes equal to or greater than a certain angle, the outer peripheral surface of the extension shaft 3 comes into contact with the inner peripheral surface of the sleeve 5, (Inclination angle) is regulated. Thereby, even if other parts are close to the periphery of the tightening part 20, the socket 4 is suppressed from contacting extra parts around the tightening part 20. The bolt 10 can be tightened while suppressing damage to the bolt 10.

  The sleeve 5 preferably has a smaller inner diameter dimension φD on the end side close to the motor shaft 2a, and a larger inner diameter dimension φD on the end side close to the socket 4, so that the extension shaft 3 ( As a result, the extension shaft 3 can be swung while the rotation of the socket 4) is stabilized.

In the bolt tightening device 1, as shown in FIG. 7, the extension shaft 3 is configured to be swingable so as to absorb the misalignment between the shaft centers X, Y, and Z of the bolt tightening device 1 and the bolt hole 22. be able to.
In the bolt tightening device 1, the engagement hole 4 e of the socket 4 and the head 10 a of the bolt 10 are securely engaged even when the shaft centers of the bolt tightening device 1 and the bolt hole 22 are misaligned. The bolt 10 can be tightened without failure.

  As described above, in the bolt fastening device 1, the protrusion 4 b is provided on the end edge 4 a of the socket 4 so that the inclination of the bolt 10 can be reliably changed, and the extension shaft 3 By being configured to be able to swing, it is possible to absorb the displacement and inclination of the arrangement of the bolts 10 and the bolt holes 22 and perform the tightening operation of the bolts 10 more reliably.

  That is, the bolt tightening device 1 according to an embodiment of the present invention is connected to the motor shaft 2a so as to be swingable, and has an extension shaft 3 that extends the motor shaft 2a and a shaft diameter φd of the extension shaft 3. The sleeve 5 is further provided with a sleeve 5 on which the inner diameter dimension φD is large and the extension shaft 3 is mounted, and the swing range of the extension shaft 3 is regulated by the sleeve 5.

According to the bolt fastening device 1 having such a configuration, the extension shaft 3 can be swung, so that the inclination of the socket 4 with respect to the bolt 10 and the bolt hole 22 can be corrected. Can be performed more reliably.
Further, in the bolt tightening device 1, the swing range of the extension shaft 3 is restricted by the sleeve 5, so that the socket 4 is prevented from coming into contact with other parts around the tightening portion 20 when the bolt 10 is tightened. Therefore, damage to the workpiece can be suppressed.

1 Bolt tightening device 2a Motor shaft (rotating shaft)
3 Extension shaft 4 Socket 4a Edge 4b Protrusion 4c Taper 4d Step 4e Engagement hole 5 Sleeve 10 Bolt

Claims (5)

A rotating shaft that is driven to rotate;
A socket attached to an end of the rotating shaft and having an engagement hole for engaging a bolt;
A bolt fastening device comprising:
An end edge portion of the socket on the side where the engagement hole is opened,
It is composed of a single projecting part in which the end edge part is partly projected in the axial direction of the socket, and a non-projecting part having no projection ,
The protrusion is formed in an arc shape along the periphery of the engagement hole, and stepped portions are provided at both ends of the protrusion in the rotational circumferential direction of the socket.
A bolt fastening device characterized by that. The protrusion is
A taper portion that reduces the protrusion height of the protrusion toward the inside in the rotational radius direction;
The bolt fastening apparatus according to claim 1, wherein An extension shaft that is swingably connected to the rotation shaft and extends the rotation shaft;
A sleeve having a larger inner diameter than the shaft diameter of the extension shaft, and covering the extension shaft;
Further comprising
By the sleeve,
Restricting the swing range of the extension shaft;
The bolt fastening device according to claim 1 or 2, wherein the bolt fastening device is provided. A bolt fastening socket attached to a rotating shaft of a bolt fastening device and having an engagement hole for engaging a bolt,
The edge portion on the side where the engagement hole is opened is
It is composed of a single projecting part in which the end edge part is partly projected in the axial direction of the socket, and a non-projecting part having no projection ,
The protrusion is formed in an arc shape along the periphery of the engagement hole, and stepped portions are provided at both ends of the protrusion in the rotational circumferential direction of the socket.
Socket characterized by that. The protrusion is
A taper portion that reduces the protrusion height of the protrusion toward the inside in the rotational radius direction;
The socket according to claim 4.

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