JPH0530573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening device, and more particularly, the present invention relates to a tightening device, and more particularly, a male threaded member is slidably held by a chuck mechanism, and is inserted into a tightening object while being rotated about an axis by a cylinder mechanism. By doing so, the male threaded member can be reliably inserted into the object to be tightened without damaging the male threaded member, and the male threaded member is prevented from rotating when the female threaded member is tightened to ensure tightening. Regarding attached equipment.

For example, in the assembly process of a two-wheeled vehicle, when a front fork is used to pivotally support a wheel, the axle shaft, which is a long male threaded member, is inserted through the shaft hole of one fork, and then inserted into the shaft hole of the other fork through the shaft hole of the wheel. It is made to protrude, and a nut, which is a female threaded member, is screwed into the end of the protrusion and tightened.

By the way, the shaft hole formed in the object to be tightened, such as a wheel, is usually formed to have an inner diameter approximately equal to the outer diameter of the male threaded member in order to prevent rattling between assembled components. has been done. Therefore, when inserting a male threaded member into a shaft hole, if the axis of the shaft hole to be tightened and the axis of the male threaded member are accurately positioned and the insertion work is not performed carefully, the threaded part formed in the male threaded member must be inserted. There is a risk that it may be crushed or damaged when inserted into the shaft hole.

For this reason, the work of inserting a male threaded member into a shaft hole to be tightened has conventionally been performed entirely by hand. That is, this operation requires highly skilled techniques, and despite this, it has been impossible to completely prevent damage during insertion.

Furthermore, when tightening a female threaded member by screwing it onto a male threaded member inserted into the object to be tightened, there is also the hassle of having to engage the head of the male threaded member with a socket trench or the like to prevent rotation. .

The present invention has been made in order to overcome all the above-mentioned disadvantages, and the present invention has been made to tighten the male threaded member without damaging it by rotating the male threaded member around the axis while the male threaded member is held by the chuck mechanism. It is an object of the present invention to provide a fastening device with a simple structure that allows the screw to be inserted into the screw and prevents the male threaded member from rotating when screwed together.

In order to achieve the above object, the present invention provides a tightening device that inserts a first screw member into a target to be tightened and screws a second screw member into the first screw member, comprising:
a cylinder mechanism including a rod member that has an engaging portion that engages with the first screw member, rotates in the same direction as the screwing direction to the second screw member, and is displaced in the axial direction thereof; and the first screw It is characterized by comprising a chuck mechanism that holds the member and inserts it into the object to be tightened via the rod member.

Next, preferred embodiments of the tightening device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a main body of a tightening device according to the present invention, and this main body 10 includes a cylinder mechanism 12, a chuck mechanism 14 integrated with the cylinder mechanism 12, and a workpiece 16. It is composed of a tightening mechanism 18 disposed opposite to the cylinder mechanism 12. In this case, a front fork 20 of a two-wheeled vehicle and a wheel 22 supported by an axle shaft 26 on the front fork 20 are used as the work 16.

Therefore, the front fork 20 has a pair of forks 24a, 24b, and each fork 24a, 2
Fork shaft holes 28a and 28b into which the axle shaft 26 is inserted are bored at the tip of the fork shaft 4b.
Further, the wheel 22 is also formed with a wheel shaft hole 30 through which the axle shaft 26 is inserted. here,
The axle shaft 26 has a hexagonal head 26a formed at one end, and a left-handed external thread 26b formed at the other end.

The tightening mechanism 18 includes a drive section 32 , a rotation main shaft 34 that is rotationally driven by a drive motor (not shown) installed in the drive section 32 , and a male screw section 26 of the axle shaft 26 that is attached to the tip of the rotation main shaft 34 .
a socket 38 engaged by a nut 36 screwed into b;
It is composed of a nut runner consisting of. In this case, the tightening mechanism 18 is attached to a support member 42 fixed to the tip of a moving arm 40 that is moved by a drive mechanism (not shown), and is movable in the direction of arrow A toward the workpiece 16. configured.

The cylinder mechanism 12, which is disposed opposite the tightening mechanism 18, includes a hollow cylindrical cylinder portion 44 and a cylinder rod 46, as shown in FIGS. 2 and 3. The cylinder rod 46 has a left-handed male screw portion 4 with a small helix angle on its side periphery.
6a is formed, and a socket 64 is attached to one end of the rod 46 to engage with the head 26a of the axle shaft 26.

A pressure fluid port 4 is provided at one end of the cylinder portion 44.
A cap 48 having a hole 8a is fitted through an O-ring 50 and fixed with a bolt 49. On the other hand, a stopper ring 52 is locked at the other end of the cylinder rod 46 inserted into the cylinder portion 44, and this stopper ring 52 and the male threaded portion 46
A piston 56 is fitted between the bearings 54a and 54b via bearings 54a and 54b. An O-ring 58 is interposed between the piston 56 and the cylinder rod 46, and the outer circumferential portion of the piston 56 comes into sliding contact with the inner circumferential wall of the cylinder portion 44 via the O-ring 60. A cylinder chamber 62 is defined between the cap 48 and the piston 56 to which pressurized air 57 is supplied from the pressure fluid port 48a.

On the other hand, at one end side of the cylinder rod 46, a threaded bush 68 is screwed into the male threaded portion 46a of the cylinder rod 46, and the support plate 66 is fitted therein. Also,
A coil spring 7 is disposed between the piston 56 and the support plate 66 on the outer periphery of the cylinder rod 46.
Wrap 0. A support stand 72 formed in a rectangular shape is attached to the other end of the cylinder part 44.
2 and a threaded bush 68 are fixed to each other by bolts 73. The support base 72 is connected to a connecting member 74
The robot arm 76 is connected to the robot arm 76 via the robot arm 76. The cylinder mechanism 12 is configured to be capable of predetermined movement by a robot arm 76 driven by a drive mechanism (not shown).

The chuck mechanism 14 is fixed to one end of a connecting member 78 fixed to the support base 72 by a bolt 80. The chuck mechanism 14 includes a drive section 82 consisting of a cylinder mechanism (not shown) and the drive section 8.
2, and a hand portion 84 that is driven to open and close by the hand portion 84. The hand portion 84 includes a pair of plate bodies 86a,
86b, and claw portions 88a, 88b attached to the tips of the plates 86a, 86b, respectively. A V-shaped groove 90 for adjusting the axial direction of the axle shaft 26 is cut into the claw portion 88a on the surface facing the claw portion 88b. In addition, the plate bodies 86a, 8
In order to ensure the minimum moving distance between the claws 88a and 88b, a stopper pin 92 is provided between the claws 88a and 6b, with one end fixed to the plate 86a and the other end close to the plate 86b.
will be placed.

The tightening mechanism according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, fork 24 of front fork 20
The wheel 22 is arranged between the front fork 20 and the wheel 2 so that the axes of the fork shaft holes 28a and 28b and the wheel shaft hole 30 are in a straight line.
2 is set, the workpiece 16 is positioned so that this axis coincides with the axis of the rotating shaft 34 in the tightening mechanism 18.

Next, the cylinder mechanism 12 and the chuck mechanism 1
4 is moved by the robot arm 76 under the action of a drive mechanism (not shown), and the hand portion 84 of the chuck mechanism 14 checks the axle shaft 26, which has been set in advance at a predetermined position by a parts transport device such as a parts feeder. In this case, the hand section 84 is, for example, the drive section 8 of the chuck mechanism 14.
The closing operation is performed by a cylinder mechanism installed in the axle shaft 2 between the claw parts 88a and 88b.
Hold 6.

The axle shaft 26 chucked by the hand portion 84 is positioned on the axis of the fork shaft holes 28a, 28b and the wheel shaft hole 30 of the workpiece 16 by the movement of the robot arm 76. At this time,
The axle shaft 26 held between the claws 88a and 88b of the hand portion 84 has its axial direction adjusted by a groove 90 carved in the claw 88a, and is set to exactly match the axis of the workpiece 16. be done.

Next, from this state, the cylinder mechanism 12 and chuck mechanism 14 are lowered in the direction of arrow B by the movement of the robot arm 76 (see FIG. 2).
In this case, the male threaded portion 26 of the axle shaft 26
b is inserted into the fork shaft hole 28a of the fork 24a. The state at this time is shown in FIG.

Therefore, the pressure fluid port 4 of the cylinder mechanism 12
Pressure air 57 is supplied into the cylinder chamber 62 from 8a. The piston 56 of the cylinder rod 46 is pressed by this pressurized air 57, and begins to move in the direction of arrow B (see FIG. 3). In this case, since a left-handed male thread 46a is formed on the outer circumference of the cylinder rod 46 and is screwed into the threaded bush 68, the cylinder rod 46 rotates counterclockwise with respect to the direction of movement in the direction of arrow B. Moving. On the other hand, there is a socket 6 at the tip of the cylinder rod 46.
4 is attached, and this socket 64 engages with the head 26a of the axle shaft 26 chucked in the hand portion 84 of the chuck mechanism 14 by movement of the cylinder rod 46 in the direction B. In this case, since the distance between the claws 88a, 88b is maintained at a predetermined interval by the stopper pin 92, the axle shaft 26 is not fixed by the claws 88a, 88b, but is pressed by the cylinder rod 46, and the cylinder rod 46 while rotating counterclockwise.

When the axle shaft 26 is inserted a predetermined amount into the wheel shaft hole 30, the hand portion 84 performs an opening operation by the drive portion 82, and the claw portions 88a, 88b are brought into an open state, thereby opening the axle shaft 26.

When the axle shaft 26 is inserted into the fork shaft hole 28b via the fork shaft hole 28a and the wheel shaft hole 30, and its tip protrudes toward the tightening mechanism 18, the tightening mechanism 18, which was previously waiting on the axis, is inserted into the fork shaft hole 28b.
moves in the direction of arrow A under the driving action of the moving arm 40. At this time, the rotation main shaft 34 of the tightening mechanism 18
is rotationally driven by the drive section 32, and the socket 3
8 is rotated clockwise when viewed from the cylinder mechanism 12 side. And Natsuto 3
6 is screwed into the male threaded portion 26b of the axle shaft 26 protruding from the fork shaft hole 28b. At this time, the male threaded portion 26b of the axle shaft 26 is being rotated counterclockwise by the cylinder mechanism 12, and when the nut 36 is screwed into the male threaded portion 26b,
Since torque is applied to prevent rotation, the tightening work can be performed reliably.

When the above tightening work is completed, the tightening mechanism 18 moves in the direction of arrow B. On the other hand, the cylinder mechanism 12
The supply of pressurized air to the cylinder chamber 62 constituting the cylinder is stopped, the cylinder rod 46 is moved in the direction of arrow A by the coil spring 70, and the socket 64 is disengaged from the head 26a of the axle shaft 26.

As described above, according to the present invention, the male threaded member that is inserted into the object to be tightened and the female threaded member is screwed to the end thereof is held by the chuck mechanism, and its insertion state is adjusted. This eliminates the risk of damaging the threads, etc. of the male threaded member. In addition, since the male threaded member is rotated in the opposite direction to the direction in which the female threaded member is screwed together during tightening, it is possible to prevent the female threaded member from rotating when screwed together, which has the effect of ensuring that the tightening work is performed reliably. can get. Furthermore, since the cylinder mechanism and the chuck mechanism are integrally constructed, their movement can be performed by one robot, which provides the advantage of further improving production efficiency.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

FIG. 1 is a front explanatory view showing the state when the tightening device according to the present invention is set to be tightened, FIG. 2 is a perspective view of the cylinder mechanism and chuck mechanism in the tightening device according to the present invention, and FIG. The figure is a partial sectional view of the cylinder mechanism and chuck mechanism in the tightening device according to the present invention. 10... Main body, 12... Cylinder mechanism, 14
...Chuck mechanism, 16...Work, 18...Tightening mechanism, 26...Axle shaft, 36...Nut, 44...Cylinder part, 46...Cylinder rod, 46a...Male thread part, 56...Piston,
68...Screw bush, 74...Connection member, 76
...Robot arm, 78...Connection member, 82...
...Drive part, 84...Hand part, 88a, 88b...
...Claw portion, 90...Groove portion.

Claims (1)

[Scope of Claims] 1 A tightening device for inserting a first screw member into a tightening object and screwing a second screw member into the first screw member, the tightening device being engaged with the first screw member. a cylinder mechanism including a rod member that has an engaging portion that rotates in the same direction as the screwing direction to the second screw member and is displaced in the axial direction; A tightening device comprising: a chuck mechanism inserted into the object to be tightened through the chuck mechanism. 2. In the device according to claim 1,
A tightening device in which a male threaded portion is formed on the outer periphery of the rod member, and a female threaded portion into which the male threaded portion is screwed is formed on the cylinder mechanism. 3. In the device according to claim 1,
The chuck mechanism is a tightening device consisting of a pair of pawls each having a groove for guiding the first screw member.