JPH0642000U - Clutch cooling system for press machine - Google Patents

Abstract

(57) [Summary] [Purpose] To dramatically improve the wind cooling effect. [Structure] A friction engagement clutch 10 is housed in a casing (4A, 4B, 6) that rotates in synchronization with a flywheel 4, and a cowl 30 having a plurality of upright absorption ports 7 is fitted and mounted in this casing to dissipate heat. 7, a plurality of air flow paths 35 are formed, and the rotational movement of the flywheel 4 is used to suck and flow a large amount of outside air for direct and forced cooling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clutch cooling device for a press machine.

[0002]

[Prior art]

 In the press machine, the flywheel and the crankshaft are formed to be connected and separated from each other via a friction engagement type clutch. If the clutch is engaged (ON) and the friction plate is frictionally engaged, the rotational power of the flywheel can be transmitted to the crankshaft, and the press operation can be performed. On the other hand, if separated (OFF), the rotational power is not transmitted to the crankshaft, so the press can be stopped. At this time, by turning on the brake having the same structure, the slide can be stopped at, for example, the top dead center position.

Therefore, in the intermittent press operation, if the clutch is frequently turned on and off, heat is generated due to the sliding phenomenon of each friction plate. If this is left unattended, the temperature rises over 80 ° C depending on the conditions, so the friction coefficient may change and the clutch performance may deteriorate, or the characteristics of the bearings and seal members at various locations may deteriorate and the life is not favorable. .

In view of this, oil is cooled around the clutch, but there is a certain limit to the diameter and number of oil pipes arranged in the casing due to its structure, so that a sufficient cooling effect cannot always be expected. Occurs. This is even more the case with an oil cooling device that does not have an oil cooler installed or with an integrated clutch and brake.

Thus, the air cooling system is also introduced. This air-cooling method includes a natural cooling type and a forced cooling type. The natural cooling type generally has a structure in which heat radiating fins are provided on the frame or casing to increase the cooling area to promote the cooling effect. On the other hand, as the forced cooling type, for example, Japanese Utility Model Laid-Open No. 48-74178 [hereinafter referred to as the former. ], The flywheel is connected to the crankshaft in tandem, a special blade is formed in the flywheel, and large fins are attached to the frame side. For example, Japanese Utility Model Laid-Open No. 58-43898 [hereinafter , The latter. ], A special ventilation passage is formed between the frame and the clutch, and a plurality of cooling fans are provided to cool the air by forced air flow.

[0006]

[Problems to be solved by the device]

 However, although the natural cooling type has a simple structure, it is difficult to significantly improve the cooling effect. On the other hand, the forced cooling type can improve the cooling effect, but obstructs the technical and economical matters of the entire press machine, which sticks to the cooling itself. In other words, the former not only increases the size of the crankshaft and complicates the structure of the flywheel, but it also indirectly cools the casing for the clutch, resulting in larger blades and excessive wind loss. In addition, the blade must have a blower structure, which results in high cost, and it is difficult to suck a large amount of outside air due to the restrictions on the position and direction of the suction port and the installation position of the blade. In the latter case, since a ventilation passage is provided between the frame and the like, it becomes large in the crankshaft direction, and it is necessary to prepare a power source for the cooling fan, a switch box, etc. Moreover, both of them have the drawbacks of complicated structure and high cost, which makes practical application difficult.

An object of the present invention is to provide a compact and low cost clutch cooling device for a press machine capable of dramatically improving the air cooling effect.

[0008]

[Means for Solving the Problems]

 The present invention has a structure in which a large amount of air is sucked in by utilizing the rotary motion of a flywheel, and the flow of cooling air flow is enhanced by utilizing the peripheral speed difference in the radial direction, and the casing for the clutch is directly and forcibly cooled. Achieve the purpose.

That is, in the clutch cooling device for a press machine according to the present invention, the friction engagement separation type clutch, which is formed so as to transmit the rotational power of the flywheel to the crankshaft, is housed in a casing that can rotate in synchronization with the flywheel. The casing is fitted from the outside with a cowl that forms a hollow portion, and a plurality of heat dissipating fins attached to the end surface of the casing extend radially in the hollow portion and are spaced apart in the circumferential direction. The air flow path is formed, and the cowl is provided with a plurality of standing suction ports for supplying the air sucked from the outside to each air flow path by utilizing the rotational movement of the flywheel.

[0010]

[Action]

 According to the present invention having the above-described structure, during the rotation of the flywheel, a large amount of air sucked from the upright suction ports of the cowl always flows in the radial direction along the plurality of air flow paths formed by the heat radiation fins and the casing It flows down the side and is released into the atmosphere from below the cowl. Therefore, the end surface of the casing to which the plurality of radiating fins are attached and the side surface continuous with the end surface can be directly forcedly cooled.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the present clutch cooling device is composed of a casing (4A, 4B, 6) to which a plurality of radiating fins 7 are attached and a cowl 30 that covers the casing from the outside. The casings (6, 4B, 4A) for accommodating the clutch 10 are directly and forcibly air-cooled by a large amount of air sucked from the plurality of standing suction ports 33 by utilizing the rotational movement.

Further, in this embodiment, paying attention to the large cooling capacity of the present cooling device (6, 7, 30), the brake 20 is also integrally incorporated in the casing to further reduce the size of the press machine. ， We are trying to simplify the structure.

In FIG. 1, the crankshaft 3 is rotatably held by the frames 1 and 1 A via a bearing 2. Further, the flywheel 4 is made integral with the casing (4A, 4B, 6) and is rotatably held by the frame 1A via a bearing 5. A clutch 10 and a brake 20 are incorporated in the casing (4A, 4B, 6). By moving the switching plate 15 in the left-right direction by a cylinder device (not shown), the clutch 10 can be turned on (OFF) and the brake 20 can be turned off (ON).

The clutch 10 is composed of a plurality of friction plates attached to each of the casing member 4B side and the rotating body (3A, 3B) side fixed to the crankshaft 3, and the flywheel 4 rotates in the ON state. Power can be transmitted to the crankshaft 3. The clutch OFF spring and the like are not shown. Further, oil pipes (not shown) forming an oil cooling device without an oil cooler are embedded in the casings 4A and 4B that house the clutch 10 and the brake 20.

A plurality of heat dissipation fins 7 are integrally formed on the end surface 6F of the casing member 6 as shown in FIGS. 2 and 3, and a plurality of air gaps extending in the radial direction and separated in the circumferential direction are formed. The flow path 35 is formed. In this embodiment, as shown in FIG. 2, the heat dissipating fins 7 are arranged so as to be inclined with respect to the rotational direction R of the flywheel 4 to further enhance the air fluidity. In addition, 7H is a mounting screw hole of the cowl 30 described later in detail.

The cowl 30 shown in FIGS. 1 and 4 has a cup-like shape including a flat portion 31 having a plurality of standing suction ports 33 and a skirt portion 32, and has a hollow portion between the casing (6). It is fitted and mounted so as to form (35, 36). Therefore, the cowl 30 is also rotated synchronously with the flywheel 4 via the casing (6, 4B, 4A).

As shown in FIG. 1, each standing suction port 33 has an opening 34 standing outside the flat surface portion 31, and a large amount of outside air Air shown in FIG. 4 is sucked by the rotational movement of the cowl 30 itself. be able to. In other words, a large amount of outside air pushed in by the rotational movement is supplied to the center side of each air flow path 35. The sucked outside air Air flows in each air flow path 35 in the radial direction from the center side to the outer peripheral surface side, removes heat from the heat radiating fins 7 and cools the end surface 6F of the casing (6), and then the skirt. The side surface 4F is forcibly cooled while flowing through the inner channel 32 of 32. After that, it is discharged to the atmosphere through the flow path 37 in the flywheel 4. The upright suction port 33 in the present invention has a suction cross section (34) that is opened orthogonally to the rotation direction of the cowl 30 (31), and the outside air (Air) sucked from here is supplied to each air flow path 35. As long as it is a structure that guides the flow to the center side of the, it can be implemented by appropriately changing the size and form.

In the embodiment having such a structure, considering the intermittent operation, the casing member 4B and the rotating body 3A are engaged by the ON operation of the clutch 10, and the rotational power of the flywheel 4 is transmitted to the crankshaft 3. Press operation. If the clutch 10 is turned off and the brake 20 is turned on when the crank angle reaches a predetermined angle, the slide can be stopped at the top dead center position.

By repeating ON / OFF of the clutch 10 and the brake 20, frictional heat is generated, and the temperature of the casing (4A, 4B, 6) gradually rises. This heat generation is uniquely cooled by the oil flowing in the casing (4A, 4B). However, as the intermittent operation is long and the number of intermittent operations per unit time increases, the temperature of the casing rises even if oil cooling is performed.

Since the flywheel 4 is constantly rotating during the press operation, a large amount of outside air (Air) sucked from the plurality of standing suction ports 33 provided in the flat surface portion 31 of the cowl 30 is As shown by the arrows in FIG. 1, the air flow paths 35 flow radially from the center side toward the outer peripheral side. That is, heat is taken from each radiating fin 7. After that, it flows through the hollow portion 36 between the casing (4B, 4A) and the skirt portion 32, and is reversed in direction to be discharged to the outside through the flow path 37. That is, the end surface 6F and the outer peripheral surface 4F of the casing can be directly and forcibly cooled with high efficiency.

According to the concrete experimental data, in the intermittent operation in which the press speed is 45 spm and the slide is temporarily stopped at the top dead center position for each stroke, the case of the present invention equipped with the cowl 30 and the cowl 30 are removed. When compared with the case described above, as shown in FIG. 5, a large difference is observed in the cooling effect on both the casing outer peripheral surface 4F and the end surface 6F. The maximum temperature difference (Δt) is about 15 to 25 ° C., though it depends on the measurement site. That is, according to the present invention, the temperature can be suppressed by 15 to 25 ° C lower than that of the conventional example (the structure is almost the same as that without the cowl). That is, the temperature of the casing (4F, 6F) can be increased by 20 to 30 ° C at maximum from the ambient temperature (for example, 20 ° C) only by attaching the cooling device to the oil cooling without installing the oil cooler. Can be suppressed to the temperature of.

Therefore, according to this embodiment, the friction engagement type clutch 10 is housed in the casing (4A, 4B, 6) that rotates in synchronization with the flywheel 4, and the plurality of standing absorption ports 7 are provided in this casing. Since the cowl 30 is fitted and attached to form a plurality of air flow paths 35 between the cowl 30 and the heat radiation fins 7, a large amount of outside air is sucked and flowed by utilizing the rotational movement of the flywheel 4. The end surface 6F and the outer peripheral surface 4F of the casing can be directly and forcibly cooled.

Further, the cowl 30 has a cup-like shape including the flat surface portion 31 and the skirt portion 32 and only needs to be fitted and mounted on the casing (4A, 4B, 6), so that the structure is simple and the cost is low. Moreover, if the suction cross section (opening 34) of the standing suction port 33 is expanded or contracted, appropriate outside air can be efficiently sucked.

As shown in FIG. 2, the plurality of radiating fins 7 are arranged so as to be inclined so as to enhance the flow in the rotation direction R, and the outside air (Air) from the upright suction port 33 is emptied. Since it is configured to flow from the center side to the outer peripheral side of the air flow path 35, the differential pressure due to the rotational speed difference between the central portion and the outer peripheral portion of the cowl 30 can be utilized, and the air cooling by the smoother air flow can be performed.

Further, paying attention to the large cooling capacity of this device, the brake 20 can be housed in the casing (4A, 4B, 6) together with the clutch 10 and the generated heat can be radiated at the same time. The entire structure can be simplified and the size can be reduced. Therefore, the capacity of the oil cooling device can be reduced, and not only the performance of the clutch 10 and the brake 20 but also the characteristics of the seals and packings of the respective parts can be stably functioned for a long period of time.

[0026]

[Effect of device]

 According to the present invention, a friction engagement type clutch is housed in a casing that rotates in synchronization with a flywheel, and a cowl having a plurality of upright absorption ports is fitted and attached to the casing to dispose a plurality of air gaps between the radiating fins. Since the flow path is formed and a large amount of outside air is sucked in and made to flow by utilizing the rotational movement of the flywheel, the end surface and outer peripheral surface of the casing are directly and forcibly forced without requiring special power. Can be cooled. As a result, the clutch performance can be kept stable and smooth press operation can be performed while the structure is simple and the cost can be reduced. At the same time, the press machine can be downsized and the applicability of intermittent operation can be expanded.

[Brief description of drawings]

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

FIG. 2 is a plan view for explaining a radiation fin provided on the end surface of the casing.

FIG. 3 is likewise a side end view.

FIG. 4 is likewise a plan view of the cowl.

FIG. 5 is also a diagram for explaining the cooling effect.

[Explanation of Codes] 1 frame 3 crankshaft 3A, 3B rotating body 4 flywheel 4A, 4B casing member (casing) 4F casing outer peripheral surface 6 casing member (casing) 6F casing end surface 7 radiating fins 10 clutch 15 switching plate 20 brake 30 Cowl 31 Plane part 32 Skirt part 33 Standing suction port 34 Opening part 35 Air flow path

Claims (1)

[Scope of utility model registration request] 1. A friction engagement clutch formed so that rotational power of a flywheel can be transmitted to a crankshaft is housed in a casing that can rotate synchronously with the flywheel, and the casing is fitted from the outside to a hollow portion. A plurality of airflow passages extending in the radial direction and separated in the circumferential direction are formed in the hollow portion by a plurality of heat dissipating fins attached to the end surface of the casing, and a cowl of the flywheel is attached to the cowl. A clutch cooling device for a press machine, comprising a plurality of standing suction ports for supplying air sucked from the outside to each air flow path by utilizing a rotary motion.