JPH0731920Y2 - Press ball cup type suspension point structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball cup type suspension point structure for a press.

[0002]

2. Description of the Related Art FIG. 5 shows a press machine having a ball cup type suspension point structure. In the figure,
The connecting rod 1 has an adjusting screw shaft 2 with a screw 1
A and 2a are screwed together and attached, and a ball 3 is fixed to the lower end of the adjusting screw shaft 2.

On the other hand, a ball cup 5 is attached to a slide 7 which is slidably guided by a gib or the like so as to be vertically movable.

Reference numeral 7a is a cylindrical body integral with the slide 7 for accommodating the worm wheel 8, 7b is a slide component for transmitting the vertical movement of the ball 3 to the slide 7, and 6 is an overload safety. A hydraulic chamber that forms the device.

Here, the connecting rod 1 and the slide 7 whose upper ends are connected to the crankshaft are connected via a spherical bearing structure formed by the balls 3 and the ball cup 5, that is, a ball cup type suspension point structure. Therefore, the slide 7 can be linearly reciprocated in the vertical direction by the swinging motion of the connecting rod 1.

By the way, in the press machine, the distance between the bolster and the slide 7, that is, the die height, must be accurately adjusted according to the mold used, so that the cylindrical body 7a of the slide 7 is rotated by the worm screw shaft 9. The worm wheel 8 is mounted, while the ball 3 is provided with a connecting pin 4 (4a is a spherical slider) extending in the radial direction.
8 are connected so that they can rotate synchronously. That is, the ball 3 and the worm wheel 8 are connected to the rotary power transmission mechanism (4, 8
They are linked in a).

Therefore, when the worm screw shaft 9 is automatically or manually rotated, the worm wheel 8 is rotated. This rotation is transmitted to the ball 3 or the adjusting screw shaft 2 via the connecting pin 4. Then, since the connecting rod 1 (female screw 1a) and the adjusting screw shaft 2 (male screw 2a) rotate relative to each other, the slide 7 is moved vertically with respect to the connecting rod 1 connected to the crankshaft,
You can increase or decrease the die height.

After that, when the crankshaft is rotated, the connecting rod 1 is oscillated around the ball 3, whereby the slide 7 can be vertically stroked to press-mold a predetermined product with the adjusted die height. it can.

As described above, since the die height adjustment is indispensable for molding a product with a predetermined accuracy and is important for preventing damage to the mold, the worm screw shaft 9 is used.
A die height adjusting device for adjusting the die height while moving the slide 7 up and down by quantitatively controlling the rotation is provided.

This die height adjusting device is composed of a drive mechanism including the worm wheel 8 and the worm screw shaft 9, and a control unit including a motor and a driver connected to the worm screw shaft 9, a controller, and a setting device. Is common.

The die height adjusting device can also be used as a so-called slide position adjusting device even during die replacement work and the like.

[0012]

[Problems to be Solved by the Invention] By the way, the connecting pin 4
Is inserted into the cross-sectional space formed by the vertical groove 8a, but in order to eliminate looseness between the both 4 and 8a, the connecting pin 4 (slider 4
If the outer diameter of a) and the width of the cross-sectional space are set to be the same, there arises a disadvantage that the slide position is changed during the press operation.

That is, since the swinging motion of the connecting rod 1 is performed around the ball 3, the connecting pin 4 extending in the axial direction passing through the center Q of the ball 3 is connected to the ball 3.
As shown in FIG. 6 in a plan view, when the position is orthogonal to the swing direction and is the center of the swing, and when the connecting pin 4 is at the position B and is in the same direction as the swing direction. Is no problem.

However, when the direction of the connecting pin 4 is at the position C and is neither orthogonal to the swinging direction of the connecting rod 1 nor in the same direction, the connecting pin 4 follows the swinging motion of the connecting rod 1. It has a two-dimensional movement. This two-dimensional movement can be decomposed into a vertical component force and a horizontal component force.

Therefore, although the vertical component force is absorbed in the vertical groove 8a, the horizontal component force acts to rotate the worm wheel 8. But the worm wheel 8
Cannot rotate because it is locked by the worm screw shaft 9. As a result, the adjusting screw shaft 2 rotates, and the slide 7 is moved up and down.

As described above, the connecting pin 4 moves two-dimensionally in accordance with the swinging motion of the connecting rod 1, and the displacement of the momentum also changes depending on the swinging angle of the connecting rod 1. Moreover, the swinging direction of the connecting rod 1 does not change due to the structure of the press machine, but the relative direction of the connecting pin 4 to this is that the worm screw shaft 9 is the worm wheel 8
It changes with each die height adjustment that is performed by rotating, and it can be said that there is almost no chance that it will be in a certain direction.

Therefore, in the present day when high precision machining is required more and more, even if the die height adjusting device is used to accurately adjust the die height, the swinging direction of the connecting rod 1 at the end of the adjustment during the press operation. Since the slide 7 is vertically displaced in accordance with the direction of the connecting pin 4 with respect to, the high precision press molding by the set die height cannot be performed.

Further, depending on the vertical dimension of the vertical groove 8a,
Since the connecting pin 4 collides, the smooth swinging operation of the connecting rod 2 is hindered. That is, smooth slide drive is hindered.

The object of the present invention is to ensure smooth slide driving, and to adjust based on the swinging motion of the connecting rod regardless of the relationship between the relative positions of the ball and the worm wheel in the rotational direction after die height adjustment. It is an object of the present invention to provide a ball cup type suspension point structure for a press that does not generate a lateral component force that rotates a screw shaft.

[0020]

SUMMARY OF THE INVENTION A ball cup type suspension point structure for a press according to the present invention comprises an adjusting screw shaft screwed to a connecting rod, a ball attached to the lower end of the adjusting screw shaft, and a slide side. In a ball cup type suspension point structure of a press, which has an attached ball cup and which connects the ball and a worm wheel fitted to the ball through a rotational power transmission mechanism, The transmission mechanism includes a plurality of inner guide grooves that are spaced apart in the circumferential direction, and an inner ring body that is fitted and mounted on the ball as a whole, and a plurality of transmission mechanisms that correspond to the inner guide grooves that are spaced apart in the circumferential direction. Between the outer ring body having the outer guide grooves and fitted and mounted on the worm wheel as a whole, and the inner guide grooves and the outer guide grooves corresponding to these A constant velocity universal joint structure including a plurality of attached spherical bodies and a retainer rotatably holding each spherical body disposed between the inner ring body and the outer ring body, To do.

[0021]

In the present invention having the above structure, the ball and the worm wheel are connected by the universal joint consisting of the inner ring body, the outer ring body, and the spherical body held by the retainer. You can adjust the die height by turning the adjusting screw shaft. Even if the relative positions of the worm wheel and the ball after the die height adjustment in the rotational direction are in any relationship, the spherical body interposed between the ball-side inner ring body and the slide-side outer ring body is free and Since it rotates at a constant speed, the connecting rod can be swung smoothly. Naturally, the rotational force in the direction of rotating the worm wheel is not transmitted from the ball side to the worm wheel side.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. This ball cup type suspension point structure is, as shown in FIGS. 1 and 2, a constant velocity universal joint composed of an inner ring body 11, an outer ring body 14, a plurality of spherical bodies 17 mounted between the inner ring body 11 and the outer ring body 14, and a retainer 20. Ball with structure 3
And a worm wheel 8 are connected to each other to form a rotary power transmission mechanism.

The same components as those of the conventional example shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be simplified or omitted.

In FIG. 1, an inner ring body 11 forming a constant velocity universal joint structure is fitted on a ball 3 and integrally fixed by a pin 13. The inner ring body 11 has a plurality of circumferentially spaced elements (in this embodiment, four elements shown in FIG.
Inner guide groove 11a is provided. Each inner guide groove 11a extends vertically as shown in FIG.

On the other hand, the outer ring body 14 is the worm wheel 8
And is fixed by the pin 15. The outer ring body 14 is provided with the inner guide grooves 11a which are circumferentially spaced from each other.
The same number (4) of outer guide grooves 14a is provided. Each outer guide groove 14a also extends in the vertical direction as shown in FIG.

Further, one spherical body 17 is mounted between the corresponding inner and outer guide grooves 11a and 14a, and the groove 11 is formed.
Rolling movement is possible within a and 14a. And it is held by the retainer 20 as a whole.

By the way, if the spherical bodies 17 are left as they are from the inner and outer guide grooves 11a and 14a together with the retainer 20, the posture stabilizing means of the retainer 20 is required. However, since the ball 3 rotates about the center Q of the ball, it is difficult to select and configure the posture stabilizing means.

Therefore, in the present invention, the corresponding guide groove 11
The retainer 2 has a structure in which a and 14a are inclined and crossed.
The posture stabilization means of 0 has been wiped out. That is, as shown in FIG. 2, each inner guide groove 11a and each outer guide groove 14a corresponding thereto are inclined in opposite directions so as to have an X-shape (cross). Therefore, each spherical body 17 is held in a groove having a diameter substantially equal to the diameter of the spherical body 17 formed by the corresponding guide groove 11a, 14a, and therefore does not fall downward.

This means that the connecting rod (1)
That is, even if the adjusting screw shaft 2 swings and inclines about the ball center Q by an angle θ, for example, as shown in FIG. 3, the vertical positions of the spherical bodies 17, 17 are different on the left and right sides, but similar to the above case. Moreover, it does not come off from the corresponding guide grooves 11a and 14a.

When the worm wheel 8 is rotated using the worm screw shaft 9 in the state shown in FIGS. 1 and 2, the outer ring body 14 integrally fixed to the worm wheel 8 rotates. Then, the outer guide groove 14a and the corresponding inner guide groove 11a
It is possible to rotate the inner ring body 11, that is, the ball 3 (adjustment screw shaft 2) integrated with the inner ring body 11 via each spherical body 17 mounted between

That is, since the rotational power of the worm wheel 8 can be transmitted to the adjusting screw shaft 2, the vertical relative position between the adjusting screw shaft 2 and the connecting rod (1) can be adjusted. That is, the die height can be adjusted. This rotational power transmission can be performed during the swinging motion of the connecting rod (1) or while it is stopped.

On the other hand, when the connecting rod (1) swings about the ball center Q, the inner race 11 integrated with the ball 3 tilts together with the ball 3 as shown by the solid line in FIG. However, the outer ring body 14 shown by the two-dot chain line is fixed to the worm wheel 8 and is stationary.

Therefore, each spherical body 17 rotates at a constant speed in the inner and outer guide grooves 11a and 14a. That is, since the spherical body 17 can freely rotate, even if the spherical body 17 is located at any position in the circumferential direction of the ball 3 when the ball 3 is viewed in a plan view, the worm is attached to the outer ring body 14 side. There is no need to apply a lateral component force such as rotating the wheel 8.

Naturally, the vertical component force is also absorbed by the rotational movement of the spherical body 17 in the inner and outer guide grooves 11a, 14a.

The inner guide groove 11a of the inner ring body 11 and the outer guide groove 14a of the outer ring body 14 have an inner diameter substantially equal to the outer shape of the spherical body 17 to be mounted, and the ball 3 and the worm wheel 8 are connected to each other. In order to arrange them so as to incline and cross when they are fixed, as shown in FIG. 4, in the state where the inner ring body 11 and the outer ring body 14 are combined, an inclined hole H is formed from the upper side shown by the solid line to the side shown by the dotted line. After dawn, inner guide groove 11a
And the outer guide groove 14a are processed at the same time, and the inner ring body 11 and the outer ring body 14 are displaced relative to each other by 90 degrees from the state shown in FIG. 3 and the worm wheel 8 may be fixed to each other.

In this embodiment, however, the rotary power transmission mechanism for connecting the ball 3 and the worm wheel 8 is constituted by the inner ring body 11, the outer ring body 14 and the spherical body 17 mounted between the guide grooves 11a, 14a. Since the constant velocity universal joint structure including the retainer 20 is used, the connecting rod (1) can be oscillated regardless of the circumferential position of the adjusting screw shaft 2 (ball 3) after die height adjustment. No lateral component force is generated on the worm wheel 8 side. Therefore, highly accurate press working can be performed with the set die height.

Further, the corresponding inner and outer guide grooves 11a, 1
Since the spherical body 17 mounted in the 4a is capable of rotating at a constant speed in all directions and is movable in the longitudinal direction of the inner and outer guide grooves 11a and 14a, the spherical body 17 is placed between the ball 3 side and the worm wheel 8 side. Can absorb the impact force of.

Further, since the corresponding inner guide groove 11a and outer guide groove 14a are arranged so as to be inclined and intersect with each other, the posture stabilizing means of the retainer 20 is not required.
Therefore, the structure is simple, the cost is low, and the installation space is small.

Both guide grooves 11a and 14a are shown in FIG.
As shown in, it can be processed at the same time, so it can be easily manufactured with high precision.

Further, since the inner diameters of both guide grooves 11a and 14a are constructed to have substantially the same size as the outer diameter of the spherical body 17, there is no play between the worm wheel 8 and the ball 3, and the die height can be adjusted with high accuracy. And it can be done quickly.

[0041]

According to the present invention, the rotary power transmission mechanism for connecting the ball and the worm wheel is a constant velocity universal joint including a spherical body mounted between the inner ring body, the outer ring body, and each guide groove, and a retainer. Since it is composed of a structure, it does not generate a lateral component force to the worm wheel side based on the swinging motion of the connecting rod, so it is possible to always ensure high-precision press working, and also to perform high-precision die height adjustment, This greatly contributes to the smooth swinging movement of the connecting rod, the avoidance of the impact force of the components, and the simplification of the lock mechanism of the adjusting screw shaft.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is also a diagram for explaining the relationship between the inner guide groove of the inner ring body and the outer guide groove of the outer ring body.

FIG. 3 is also a diagram for explaining the operation during the swinging motion of the connecting rod.

FIG. 4 is also a diagram for explaining a method of processing the inner guide groove and the outer guide groove.

FIG. 5 is a side sectional view showing a conventional example.

FIG. 6 is a diagram for explaining a problem of the conventional example.

[Explanation of symbols]

 1 connecting rod 2 adjusting screw shaft 3 ball 4 connecting pin 5 ball cup 7 slide 8 worm wheel 8a vertical groove 9 worm screw shaft 10 constant velocity universal joint (rotary power transmission mechanism) 11 inner ring body 11a inner guide groove 14 outer ring body 14a outside Guide groove 17 Spherical body 20 Retainer

Claims (1)

[Scope of utility model registration request] 1. An adjusting screw shaft screwed to a connecting rod, a ball attached to the lower end of the adjusting screw shaft, and a ball cup attached to the slide side, and the ball and the ball fitted on the ball. In a ball cup type suspension point structure of a press, in which a worm wheel provided is connected via a rotary power transmission mechanism, the rotary power transmission mechanism is provided with a plurality of inner guide grooves spaced apart in the circumferential direction. It has an inner ring body that is fitted and mounted on the ball as a whole, and has a plurality of outer guide grooves that correspond to the inner guide grooves that are spaced apart in the circumferential direction, and is fitted and mounted on the worm wheel as a whole. The outer ring body, a plurality of spherical bodies mounted between each inner guide groove and the outer guide grooves corresponding to these, and each spherical body arranged between the inner ring body and the outer ring body are rotatable. Ball cup suspension point structure of the press, characterized by being configured using the constant velocity universal joint structure including a retainer for holding.