JPH06328300A - Clutch for press machine - Google Patents

Abstract

PURPOSE:To extend the life time of a clutch for multi-disk press machine and to prevent generation of troubles. CONSTITUTION:An outside and inside receiving plates 33 and 34 which are turned together with a fly wheel 1 holding both outside surfaces of outside and inside friction plates 31 and 32 which are turned together with a turning shaft 2 are provided in the axial direction in a state in which they are freely slided. An air cylinder 4 is held between both friction plates to be freely slided together with the friction plates in the axial direction. By supplying compressed air to the air cylinder 4, a piston 43 is extended to be abutted on both friction plates 31 and 32 and a turning torque is equally transmitted to both sides. Thus, the life time is extended since the friction plates are equally cooled and weared. It is difficult to generate troubles such as abnormal heating, smoking and repetitive knocking during operation since heat strain and half clutch are not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch mechanism for transmitting a driving force of a press machine, but this idea can be applied to a brake of the press machine.

[0002]

2. Description of the Related Art Since a press machine requires a large driving force to carry out a press work, it is not necessary to directly connect the drive machine to directly move the slide of the press up and down, and the desired work is achieved. It is common to apply a flywheel to store enough energy to store. It is the clutch that is responsible for the transmission of transmission and interruption of rotation from the flywheel to the rotating shaft, that is, the crankshaft.The flywheel of the press is extremely heavy and the rotating torque that it transmits is also very large. Many challenges remain in its structure. Moreover, some proposals aimed at solving the problem can also be seen.

For example, FIG. 2 shows a Japanese Utility Model Publication No. 62-4.
In the prior art of Japanese Patent No. 5840, the pin 101 is sealed and inserted into a plurality of pin holes provided on the joint surface between the drive shaft 2a and the friction plate 31a so as not to come out of both ends, and the friction plate 31 is inserted.
The feature a is characterized in that the inner edge portion provided with the pin hole is formed to have a thickness shorter than the length of the pin and is slidable in the axial direction. As a result, the friction plate moves in the axial direction to transmit the rotational force of the flywheel to the drive shaft when it is in pressure contact with the flywheel 1a, and the rotational torque can be transmitted without any phase shift, making it a highly reliable clutch. It is said that it has become.

However, in recent years, the demand for improved press productivity is ever increasing, and in order to respond to high-speed operation and an increase in molding ratio, a drastic increase in driving force and rapid and reliable operation are possible. High torque transmission is becoming an essential condition. Since the capacity required for a clutch becomes even more severe, a huge friction surface is required for calculation in order to cover the discontinuity of the rotational force between the flywheel and the rotary shaft with a single friction plate as in the past. In reality, it is almost impossible to incorporate such a large-diameter friction plate in a clutch.

For this reason, in the recent industry, if two or more friction plates are opposed to each other in parallel to one set of clutches and each of them functions as a single friction plate, the clutch as a whole will not have the conventional structure. The idea that the ability could be more than doubled appeared. Even if one of the clutches of this type is proposed in Japanese Examined Patent Publication No. Sho 42-7751, the development history is not necessarily new, but in recent years, various improvements have been made to the multi-plate clutch. The structure shown in FIG. 3 is commonly used at present. In the figure, the rotary shaft 2b rotates within the main body 5b, the flywheel 1b rotates under the driving force of a driving machine (not shown), and the rotary torque of the flywheel is intermittently applied to the rotary shaft. It is the clutch 3b. The clutch 3b is provided with two outer friction plates 31b and inner friction plates 32b which are erected parallel to and opposed to the clutch hub 21b which rotates together with the rotation shaft as shown in the figure. The plate 102 is interposed together with the clutch case 35b. The inner peripheral surfaces of the outer friction plate 31b and the inner friction plate 32b mesh with the outer peripheral surface of the clutch hub 21b slidably in the axial direction, and the outer peripheral surfaces of the intermediate receiving plate 102, the inner receiving plate 34b, and the piston 103 are clutch cases. It is meshed with the inner peripheral surface of 35b slidably in the axial direction.

Since the piston 103 is connected to the pneumatic supply / exhaust device 46b mounted on the main body side by the supply / exhaust pipe 47b, when the rotational torque of the flywheel is transmitted, compressed air is supplied to move the piston 103 to the left side in the figure. It pushes toward and slides in parallel with the axis, and the pressing force is transmitted and slides in the order of the outer friction plate 31b, the intermediate receiving plate 102, and the inner friction plate 32b, and finally the surface of the inner receiving plate 34b. The two friction plates are pressed between the piston and the inner surface of the piston, and the rotational torque is transmitted to the rotary shaft via the friction plates and the clutch hub. When the supply of air pressure is cut off, the lateral biasing force pressing the piston is lost, and the spring 10 biasing the screw bolt penetrating the clutch cover 37b to the right in the figure.
Therefore, the piston 103 is pulled to the right because of 4, and the clutch is disengaged, so that the rotational torque is not transmitted from the flywheel to the rotary shaft.

[0007]

If two or more friction plates are used, the friction area effective for torque transmission is doubled without increasing the diameter of the plates, resulting in a drive force much larger than the conventional one. Communication is possible. Although this point can be highly evaluated, since the pressing of the friction plate is due to the movement of the piston from one direction, the pressing force is the external friction plate 31b, the intermediate receiving plate 102,
The transmission in the order of the inner friction plate 32b is essentially inevitable. Therefore, of the two friction plates, the outer friction plate 31
The amount of wear of the inner friction plate 32b becomes significantly larger than that of b, resulting in a large imbalance in the wear of both. In particular, the frictional heat generated by the friction on the outer friction plate 31b is relaxed by the cooling effect due to the compressed air applied to the adjacent piston, while the inner friction plate 32b has room for this cooling effect. Therefore, the temperature rise due to friction is greater than that of the outer friction plate 31b. In this way, the internal and external temperature imbalances occur, and only the wear of the internal friction plate 32b significantly progresses, which is a great difficulty in maintenance.

Since the intermediate receiving plate 102 sandwiched between the inner friction plate 32b and the outer friction plate 31b has different temperatures on both side surfaces, the temperature does not rise uniformly, resulting in thermal distortion. This distortion increases as the plate thickness of the intermediate receiving plate becomes thinner, and sometimes the plate itself is deformed to the state of tilting in the clutch. Not only does this prevent the contact surface with the friction surface from being evenly contacted, but the meshing between the intermediate receiving plate and the clutch case 35b is disengaged, and abnormal drive transmission occurs. May cause fever and smoke,
The half-clutch causes a difficult situation in which a double-stroke malfunction occurs.

In order to solve the above-mentioned problems, the present invention provides a multi-plate type clutch using two or more friction plates, in which the wear of the friction plates progresses almost evenly and a half-clutch phenomenon occurs. An object of the present invention is to provide a clutch device for a press machine that can avoid abnormal situations such as heat generation, smoke generation, and double strikes because it does not occur.

[0010]

A clutch of a press machine according to the present invention is an outer friction plate 31 and an inner friction plate 32 which are co-rotating with a rotating shaft 2 and are slidably engaged in the axial direction and opposed in parallel. And an outer surface of the outer friction plate 31 and an inner friction plate 32 that mesh with the flywheel 1 while slidably engaging in the axial direction.
The outer receiving plate 33 and the inner receiving plate 34, which face the inner surface of the, are meshed with the flywheel 1 while being slidably engaged in the axial direction while being able to come in contact with and separate from the inner surface of the outer receiving plate 33 and the outer surface of the inner receiving plate 34. The above-mentioned problem is solved by the air cylinder 4 facing the above.

In this construction, the outer peripheral surface of the cylinder portion 41 of the air cylinder 4 is the inner teeth 3 of the clutch case 35.
6, the outer peripheral surface of the bottom plate 44 protruding from the piston 43, which is fitted in the cylinder portion 41 in a telescopic manner, is also provided with the outer tooth 45 so as to be integrally slidably movable in the axial direction. The pneumatic supply / discharge device 46 and the supply / discharge pipe 4 attached to the main body 5
It is a very preferred embodiment to be connected intermittently via 7.

[0012]

In the clutch according to the present invention, since there is no intermediate receiving plate between the two friction plates and the air cylinder is interposed, when the air cylinder is operated, the top surface of the cylinder portion with respect to the outer friction plate 31 is moved. Since the bottom plate of the piston presses against the inner friction plate 32 and presses both of them evenly, and the cooling action of the working air acts on both of them equally, the friction heat of the friction plates is similarly eased and the wear of both plates is prevented. Proceed evenly. In this way, the induction of the half-clutch state due to the abnormal deformation of the intermediate receiving plate, which has not been wiped out in the past, is eliminated, and a reliable clutch action is always ensured.

[0013]

1 is a vertical sectional front view showing an embodiment of the present invention. Here, the outer friction plate 31 and the inner friction plate 32, which are two friction plates, are illustrated, but the number of friction plates is not particularly limited, and basically the action and the effect are changed. There is no. The figure shows a clutch 3 that transmits a flywheel 1 that stores a rotational torque from a drive machine (not shown) to a rotary shaft 2 that is axially supported by a main body 5 of a press machine. Explaining the details of the clutch 3, an outer friction plate 31 and an inner friction plate 32, which mesh with the outer teeth 22 formed on the outer peripheral surface of the clutch hub 21 that rotates together with the rotating shaft 2, are vertically slidable in the axial direction. Side by side, the outer surface of the outer friction plate 31 is the outer receiving plate 33.
The inner surface of the inner friction plate 32 and the inner surface of the inner friction plate 32 face the outer surface of the inner receiving plate 34 in a freely contactable and separable manner. The outer receiving plate 33 and the inner receiving plate 34 are provided with outer teeth which mesh with inner teeth 36 formed on the inner peripheral surface of the clutch case 35.

The air cylinder 4 is interposed between the outer friction plate 31 and the inner friction plate 32. The air cylinder 4 is composed of a cylinder portion 41 and a piston 43 fitted in the cylinder portion 41 so as to be able to move back and forth therein.
Is engraved and meshes with the internal teeth 36 of the clutch case, and the external teeth 45 are also engraved on the outer peripheral surface of the bottom plate 44 of the piston and meshes with the internal teeth 36. Can slide in parallel with. The top surface of the cylinder portion of the air cylinder 4 and the bottom plate of the piston serve as a friction desk to press or separate from the friction surfaces of both friction plates to transmit or cut rotational torque. It is driven by an air pressure supply / discharge device 46 attached to the cover 37, and the piston 43 is slid axially in the cylinder portion through the supply / discharge pipe 47 to uniformly press both friction plates.

An inner spring 48 is interposed between the outer surface of the inner receiving plate 34 and the piston bottom plate 44, and the outer receiving plate 33 is also provided.
Since the outer spring 49 is interposed between the cylinder and the top surface of the cylinder portion, when compressed air is pressed in from the pneumatic supply / discharge device, the urging force of both springs is pushed back to move the piston.
When the air is discharged, the outer friction plate 31 and the inner friction plate 32 are separated from both sides of the air cylinder and both sides of the inner receiving plate 34 and the outer receiving plate 33 due to the biasing force of the spring, the clutch is released, and the flywheel. Is not transmitted.

[0016]

As described above, the clutch of the press machine according to the present invention doubles the rotational torque that can be transmitted by the plurality of friction plate types without increasing the diameter of the entire apparatus. All proceed almost equally,
As a result, the time for replacement due to wear is extended and conditions extremely advantageous for maintenance are created. In addition, there is no possibility that an abnormal situation due to a half clutch or the like will occur during the operation of the press machine, and as a highly reliable clutch, there is an effect of contributing to speeding up of the press machine and improvement of productivity.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a conventional technique.

FIG. 3 is a vertical sectional front view showing another conventional technique.

[Explanation of symbols]

 1 Flywheel 2 Rotating shaft 3 Clutch 4 Air cylinder 5 Main body 21 Clutch hub 22 External tooth (clutch hub) 31 External friction plate 32 Internal friction plate 33 External receiving plate 34 Internal receiving plate 35 Clutch case 36 Internal tooth (clutch case) 37 Clutch cover 38 External teeth (external receiving plate) 39 External teeth (internal receiving plate) 41 Cylinder part 42 External teeth (cylinder part) 43 Piston 44 Bottom plate 45 External teeth (bottom plate) 46 Pneumatic supply / discharge device 47 Supply / discharge pipe 48 Spring 49 Outer spring

Claims (2)

[Claims] 1. In a clutch of a press machine for transmitting the rotation of a flywheel 1 to a rotary shaft 2 by adhering a friction plate, the rotary shaft 2 and the clutch are slidably meshed in the axial direction while facing each other in parallel. The outer friction plate 31, the inner friction plate 32, and the outer receiving plate 33, which meshes with the flywheel 1 and is slidably engaged in the axial direction while facing the outer surface of the outer friction plate 31 and the inner surface of the inner friction plate 32. Inner backing plate 34 and flywheel 1
Outer support plate 3 that meshes with the axis of rotation while rotating with
A clutch for a press machine, comprising an air cylinder 4 facing the inner surface of 3 and the outer surface of the inner receiving plate 34 so as to come into contact with and separate from the inner surface of the inner receiving plate 34. 2. The air cylinder 4 according to claim 1, wherein the outer peripheral surface of the cylinder portion 41 comprises outer teeth 42 which mesh with the inner teeth 36 of the clutch case 35.
Bottom plate 44 protruding from the piston 43, which is elastically fitted inside
The outer peripheral surface of the is also provided with external teeth 45 and is integrally slidably engaged in the axial direction, and is intermittently connected via a pneumatic supply / discharge device 46 attached to the clutch cover 37 and a supply / discharge pipe 47. The clutch of the press machine characterized by being