JPH0453863Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a clamping device, and in particular to a drive plate suitable for use in tightening the torque converter of an automatic transmission and the drive plate of an engine. This invention relates to an improvement of a plate clamping device.

[Conventional technology]

Conventionally, as shown in FIG.
The guide portion 532 of the end disk 53 is fitted into the clamp hole 52 of the set plate 51, and the stopper pin 54 can be engaged with the mounting hole 522 of the set plate 51.
In the clamping device 50 provided with 6,
A pair of hooks 57 and 58 are provided so as to be expandable and retractable and engage with clamp holes 52 that are pivotally supported by pins in diametrical slits 534 of the end disk 53.
7, 58 was connected to the telescopic rod 592 of the fluid cylinder 59, and the other hook was linked to the casing 594 of the fluid cylinder 59.

Such technology is disclosed in our earlier application, for example, Japanese Utility Model Publication No. 60-21176.

[Problem that the invention attempts to solve]

However, since the conventional clamp device had a pair of clamp claws (hooks 57, 58),
There was a problem that the clamping force was weak.

For this reason, a three-jaw type clamp device was devised and studied repeatedly, but it had the following problems.

That is, if the three clamp claws are formed to have the same dimensions, it is possible to evenly clamp the workpiece, but there is a problem in that it is difficult to form the three clamp claws to have the same dimensions in terms of processing accuracy.

Furthermore, if the positions of the mounting fulcrums of the clamp claws are misaligned, the three clamp claws do not contact the workpiece equally, causing the problem that only the claws that hit the workpiece first clamp the workpiece.

Conversely, if the force of the piston of the cylinder device that generates the clamping force is large, the piston itself will tilt diagonally as it tries to forcefully move the remaining clamp claws that do not touch the workpiece, causing the problem of twisting. It was hot.

Furthermore, even if the machining accuracy of the clamp claws is good, the thickness of the workpiece may vary at various locations, and in such cases, problems similar to those described above still occur.

In particular, when a clamp claw with a fulcrum is used, such as when tightening an engine drive plate, the workpiece is clamped in the direction of the center of the clamp claw. There was a problem in that the above-mentioned problems were more pronounced than in the case where the

Therefore, an object of the present invention is to equalize the clamping force of each clamping claw in a three-jaw type clamping device, and also to make it possible to clamp workpieces having different thicknesses.

[Means for solving problems]

For this reason, the clamping device according to the present invention, referring to the numbers attached to the drawings, has three clamping claws 4 attached to the tip of the cylindrical body 2 with hinge pins 6, and a stepped slope of the clamping claws 4. A piston 92 of a cylinder drive device 9 whose surface 42 is provided at the rear of the cylindrical body 2 through a tapered ring 8.
The structure is characterized in that the clamp claw 4 is actuated by pressing the clamp claw 4.

Specifically, the clamp device is configured to be able to be inserted into a clamp hole 14 formed in a support plate 12 and to clamp the support plate 12 with three clamp claws 4 attached to the tip of a cylindrical body 2. The clamp claw 4 is pivotably supported by a hinge pin 6, and is always biased by a spring 7 in the direction in which the clamp claw 4 is opened. 42 is in contact with the stepped inclined surface 82 of the tapered ring 8 disposed inside the cylindrical body 2, and the tapered ring 8 is moved by the piston 92 of the cylinder drive device 9 to which the cylindrical body 2 is fixed. , and is configured to be movable along the axial direction.

[Effect]

To explain the operation of the present invention according to the above configuration, the stepped inclined surface 42 of the three clamp claws 4 attached to the tip of the cylindrical body 2 with the hinge pin 6,
By pressing with a piston 92 of a cylinder drive device 9 provided at the rear of the cylindrical body 2 via the taper ring 8, the clamp claw 4 can be actuated to clamp the workpiece (support plate 12).

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a partially cutaway side view showing the schematic structure of the clamp device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a rear view thereof.
Similarly, FIG. 4 is a plan view thereof, FIG. 5 is a sectional view taken along the line - in FIG. 4, and FIG. 6 is a -
7 is a partially cutaway side view showing the schematic structure of the clamping device in a different operating state from FIG. 1; FIG. 8 is a schematic structure of the conventional clamping device. FIG.

The clamp device 1 includes a cylindrical body 2, a clamp claw 4, a hinge pin 6, a spring 7, a taper ring 8, and a cylinder drive device 9.

The clamping device 1 includes a support plate (in this case,
End plate attached to the engine) 12
It can be inserted into a clamp hole 14 formed in.

The clamp device 1 is configured to be able to clamp the support plate 12 using three clamp claws 4 attached to the tip of the cylindrical body 2. Note that FIG. 1 shows a state in which the clamp claw 4 is closed.

That is, the clamp claw 4 is pivotably supported by a hinge pin 6 and is supported by a spring 7.
Therefore, the clamp claw 4 is always biased in the direction to be opened.

Furthermore, a stepped inclined surface 42 is formed on the back of the clamp claw 4. The stepped inclined surface 42 includes a stepped inclined surface 8 formed in two steps of the tapered ring 8 disposed inside the cylindrical main body 2.
2,84 are in contact with each other.

Furthermore, the taper ring 8 is configured to be movable along the axial direction of the cylindrical body 2 by a piston 92 of a cylinder drive device 9 to which the cylindrical body 2 is fixed.

Then, as the taper ring 8 moves forward and backward as the piston 92 reciprocates,
The clamp claw 4 is configured to open and close.

However, the piston 92 and the taper ring 8 are in contact with each other so that they can slide in the direction perpendicular to the axis.

Further, the taper ring 8 is configured to be pushed back by the opening force of the clamp claw 4 and the force of the spring 86.

Further, a base plate 94 is fixed to the back side of the cylinder drive device 9, and a piston 92
It serves as a stopper during the backward movement.

The cylindrical body 2, cylinder drive device 9, piston 92 and base plate 94 are fixed with bolts and countersunk screws, and the O-ring 11
1, 112, 113, 114 and 115.

In addition, the base plate 94 includes an air pipe 96.
(Fig. 3) is installed, and the cylinder drive device 9
An air pipe 98 is attached to the.

By supplying and discharging air from these two locations, the piston 92 is driven and the clamp claw 4 is operated.

Further, a bearing 26 is provided at the axis of the cylindrical body 2.
A pinion shaft 28 is set through the nut liner 29, and is configured to be rotated by a nut liner 29.

The bearing 26 is covered with a boss 25, and the boss 25 is connected to the support plate 12.
It is configured to be able to fit into the clamp hole 14 of.

To explain the operation of the embodiment according to the above configuration, first, an operator (not shown) sets the clamp device 1 in the clamp hole 14 of the support plate 12 and supplies air from the air pipe 96.

As a result, the piston 92 of the cylinder drive device 9 moves forward, and the taper ring 8 moves forward accordingly.

At this time, as the taper ring 8 moves forward, the stepped inclined surfaces 82 and 8 of the taper ring 8 move forward.
4, the clamp claw 4 is moved to perform a clamping action.

That is, the stepped inclined surfaces 82 and 84 are in two stages, and the stepped inclined surface 84 in the first stage has the following characteristics:
The clamp claw 4 moves significantly as the piston 92 moves forward.

On the other hand, when the second stepped inclined surface 82 is applied, the movement of the clamp claw 4 becomes smaller, but the clamping force increases.

That is, the clamping force of the support plate 12 is
It is generated on this second stepped inclined surface 82. This two-stage structure of the inclined surface reduces the stroke of the piston 92 and shortens the overall length of the clamp device 1.

Here, regarding the clamping action by the taper ring 8, the taper ring 8 moves forward and the clamp claw 4
The case where the support plate 12 is clamped will be explained in more detail by taking as an example.

That is, suppose that the position of the mounting fulcrum of one clamp claw 4 among the three clamp claws 4 has shifted toward the piston 92 side.

In this case, the clamp claw 4 will clamp the support plate 12 first. At this time, the remaining two clamp claws 4 do not clamp the support plate 12 tightly.

From this state, when the piston 92 moves further forward, the taper ring 8 moves against the clamp claw 4 that came into contact with it first.
The piston 92 begins to slide on the inclined surface 42, and the contact surface with the piston 92 also slides, causing the center to shift.

As a result, the remaining two clamp claws 4 are moved, and finally the three clamp claws 4 firmly clamp the support plate 12.

In other words, by sliding the tapered ring 8 on the inclined surface 42 of the clamp claw 4 that hit the support plate 12 first and moving the remaining clamp claws 4, all of the clamp claws 4 are finally supported. When it hits the plate 12, the piston 92
will stop.

In this way, even if not only the position of the mounting fulcrum of the clamp claw 4 is misaligned, but also the clamping thickness of the support plate 12 is different, it is possible to clamp the support plate 12 smoothly and evenly.

Now, returning to the clamping action and continuing the explanation, in the clamped state the nut runner 29
The pinion shaft 28 rotates the torque converter and the drive plate (both not shown) by a predetermined angle at equal pitches to perform tightening.

After the tightening work is completed, when air is supplied from the air pipe 98 to move the piston 92 backward, the taper ring 8 moves backward and the clamp claw 4 opens.

In this way, the clamp can be released. Note that FIG. 7 shows this state.

Although specific embodiments of the present invention have been described above, the present invention is not limited thereto, and various other embodiments can be considered by those skilled in the art within the scope of the claims for utility model registration.

For example, in the above embodiment, a spring was used to push back the tapered ring, but if the opening force of the clamp claw is strong, the spring may be omitted.

[Effect of idea]

As explained above, the present invention has three clamp claws attached to the tip of the cylindrical body with hinge pins, and a stepped inclined surface of the clamp claw is attached to the rear of the cylindrical body through tapering. Since the clamping claws are actuated by pressing with a piston of a cylinder drive device, the clamping force of each clamping claw can be equalized, and it is also possible to clamp workpieces having different thicknesses.

Further, since the machining accuracy of the clamp claws and the mounting fulcrum may be somewhat low, the manufacturing cost of the clamp device can be reduced.

Further, the piston of the cylinder drive device is free from stiffness, the life of the O-ring can be extended, and wear of the piston and the like can be reduced.

In addition, since the external movable part is secured only by the clamp claw, it is possible to eliminate the need for a cover.

Furthermore, the stepped inclined surface of the taper ring is multi-stage, and the slope of the inclined surface is reduced only in the areas where clamping force is required, which has the excellent effect of shortening the overall length of the clamping device and making it more compact. play.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing the schematic structure of the clamp device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a rear view thereof.
Similarly, FIG. 4 is a plan view thereof, FIG. 5 is a sectional view taken along the line - in FIG. 4, and FIG. 6 is a -
7 is a partially cutaway side view showing the schematic structure of the clamping device in a different operating state from FIG. 1; FIG. 8 is a schematic structure of the conventional clamping device. FIG. 1... Clamp device, 2... Cylindrical body, 4...
Clamp claw, 6... Hinge pin, 7... Spring, 8... Taper ring, 9... Cylinder drive device, 12... Support plate, 14... Clamp hole, 42, 82, 84... Stepped slope, 92...
…piston.

Claims (1)

[Claim for Utility Model Registration] A clamping device that can be inserted into a clamp hole formed in a support plate and configured to clamp the support plate using three clamp claws attached to the tip of a cylindrical body. The clamp pawl is pivotably supported by a hinge pin, and is always biased by a spring in a direction in which the clamp pawl is opened, and a stepped inclined surface on the back of the clamp pawl has a , a stepped inclined surface of a tapered ring disposed inside the cylindrical body comes into contact with the tapered ring, and the tapered ring is moved along the axial direction by a piston of a cylinder drive device to which the cylindrical body is fixed. A clamp device characterized in that it is configured to enable.