JPH0599248A - Safety shaft coupling with auxiliary shaft coupling - Google Patents

Abstract

PURPOSE: To make an urgent power transmission possible even a safe shaft coupling is held up by arranging a supplementary shaft coupling between two shaft couplings that engages the shaft coupling while the power transmission by the safe shaft coupling is held up, for a safe shaft coupling having a friction engagement safe shaft coupling. CONSTITUTION: A first shaft coupling 4 constituted as a flange 2 is surrounded by a ring shaped an expansion element 8 that has a pressure chamber 9 in its interior, supports high pressure fluid from a screwed pipe joint 10 to a pressure chamber 9 and pressurizes. A second shaft joint 5 as a friction sleeve 6 and a shaft 3 are frictionally connected to the flange 2. And, as a supplementary shaft joint 12, crown gears 13 are arranged respectively in end rim of the flange 2 and shaft joint ring 14, at normal state, the shaft joint ring 14 and a spline 17 slide and are at non-engaged state by a coil spring 18. While the screwed pipe joint 10 is broken and the safe shaft joint is working at occurrence of an abnormal torque, the pressure ring 16 displaces to release ring 11, the supplementary shaft joint 12 is engaged to conduct urgent power transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft coupling assembly having a friction engagement type safety shaft coupling for cutting off power transmission in a power transmission path in response to load. This type of shaft coupling is used especially in a power transmission mechanism of a heavy machine. In such a mechanism, the torque transmitted with extremely large fluctuations causes the transmission capability of the drive motor and the power transmission mechanism It may exceed the transmission capacity or the allowable torque of other members. In order to avoid the inconvenience caused by the destruction of the portion or the interruption of the power transmission, it is preferable that the transmission torque capability as high as possible can be restored.

[0002]

2. Description of the Related Art DE-OS36 is a safety shaft coupling of this type.
It is known from Japanese Patent No. 38596. This shaft joint is, for example, in a rolling roll device, with a universal joint,
It is provided between the journal part. In such a safety shaft joint, both shaft joint portions are coaxially and rotatably supported with respect to each other. In order to transmit the rotational torque, the outer shaft coupling portion is provided with an expansion chamber for introducing a high-pressure fluid to exert a pressing force toward the inner shaft coupling portion. By filling the expansion chamber with the pressurized fluid, both portions of the shaft coupling frictionally engage with each other and the rotational torque can be transmitted.

When an overload is applied to this safety shaft joint, slippage occurs between both parts of the shaft joint, so that the pressure release device operates, the high pressure fluid in the expansion chamber is discharged, and rotation between both shaft joints occurs. The torque transmission is cut off. As a result, the power transmission is interrupted, but the driven device is left in a state in which it generates a large rotational torque and causes the safety shaft coupling to operate. In this case, the mechanical device can be driven only after the power transmission capacity of the safety shaft coupling is restored. Therefore, there is a possibility that the safety shaft coupling may immediately be activated again. Even if the cause of the failure is removed, for example,
It is conceivable that a burning roll block or the like causes a serious obstacle that affects a workpiece or a mechanical device being processed.

[0004]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the main object of the present invention is to provide an emergency power transmission operation even when an operation for interrupting the power transmission is caused. The object is to provide a safety shaft coupling of the above type as is possible.

[0005]

SUMMARY OF THE INVENTION In accordance with the present invention, such objects are rotatably combined so as to be coaxial with each other and opposite each other so as to be frictionally engageable by a hydraulic expansion element. In a friction engagement type safety shaft coupling that includes two shaft coupling portions that are configured to cut off power transmission according to a load in a power transmission path, the safety shaft coupling cuts off power transmission by the shaft coupling. Achieved by providing an auxiliary shaft coupling as a second shaft coupling provided between both shaft coupling parts so as to engage the both shaft coupling parts with each other when the shaft coupling is performed. To be done.

[0006]

In this way, the second shaft joint connected in parallel to the safety shaft joint performs an auxiliary operation for the safety shaft joint, and even after the safety shaft joint is activated, the two parts of the shaft joint are separated. Can be engaged with each other. Even if the maximum value that can be transmitted in the power transmission path is exceeded, an emergency drive state is achieved without being limited by the maximum torque value that can be transmitted until the cause of the failure that caused the operation of the safety shaft coupling is eliminated. To be done. This eases the driving conditions and in many cases
The safety shaft coupling can be recovered quickly.

If the auxiliary shaft coupling that can be engaged and disengaged is used, suitable control can be performed when emergency power transmission becomes unnecessary. In order to avoid excessive torque transmission, the auxiliary shaft coupling should be slippable, for example,
When the auxiliary shaft coupling comprises a conical friction shaft coupling having a friction ring axially biased between the both shaft coupling portions, the auxiliary shaft coupling is always engaged with the auxiliary shaft coupling. Good.

Alternatively, the auxiliary shaft coupling may be constructed as a shaft coupling which can be engaged and disengaged. In this case, the auxiliary shaft coupling may be an electromagnetic friction shaft coupling controlled from the outside, It may be configured as a hydraulically operated friction shaft coupling.

Further, the auxiliary shaft coupling is composed of a shaft coupling capable of lock engagement, can be engaged from the outside, and is further capable of being disengaged by a load, or a crown gear tooth. And the teeth of both members engage with each other due to the axial sliding motion of these members, and the teeth have inclined side surfaces, so that the teeth increase as the load increases. The auxiliary shaft coupling may be blocked by the axial force generated from the side surface of the auxiliary shaft coupling.

The actuating device of the auxiliary shaft coupling may be fixed in the vicinity of the shaft coupling assembly without rotational movement, whereby the working cylinder of the auxiliary shaft coupling is fixed to the shaft coupling assembly. And to supply fluid to the cylinder from the outside through a rotary pipe joint, or an operating electromagnet for a friction shaft joint is fixed to the shaft joint assembly, and to the electromagnet, Achieved by supplying current using slip rings and brushes.

[0011]

EXAMPLE FIG. 1 shows a safety shaft joint 1 and an auxiliary shaft joint 12.
Figure 3 shows a shaft coupling assembly comprising. First of shaft coupling
The part 4 is configured as a flange 2 for the universal joint, through which rotational torque can be transmitted to the shaft 3. The second shaft coupling part 5 is designed as a tubular friction sleeve 6 which is coaxially received inside the first shaft coupling part 4 and a bearing 7 allows the two parts 4, 7 to rotate relative to each other. Have been combined. The first shaft coupling part 4 is surrounded by a ring-shaped expansion element 8. Inside the expansion element 8, there is provided a pressure chamber 9 which extends in the axial direction and has a small length in the radial direction. Can be filled with high pressure fluid. When the expansion element 8 is put under pressure, this pressure is transmitted to the first shaft coupling part 4 and also to the friction sleeve 6 and the shaft 3 for a frictional engagement between the flange 2 and the shaft 3. Is achieved.

As is well known, a threaded pipe joint 10
The radially outer end of the is received in the opening of the release ring 11 fixed to the shaft coupling ring 14. The shaft coupling ring 14 is movable in the axial direction with respect to the friction sleeve 6, but is fixed in the radial direction so that the spline 17 is fixed.
Is connected to the sleeve 6 via. Therefore, the release ring 11 rotates integrally with the friction ring 6 and the shaft 3. However, when a large rotational torque is transmitted between the flange 2 and the friction sleeve 6 to cause relative slip, the outer end of the threaded pipe joint 10 is broken and the fluid in the pressure chamber 9 is broken. Is discharged, and as a result, the space between the flange 2 and the friction sleeve 6 becomes relatively freely rotatable. Due to the function of the expansion element 8, the shaft coupling assembly can operate as a safety shaft coupling.

In order to carry out the above-mentioned emergency operation of a machine including the above-mentioned shaft coupling assembly in the power transmission path, both shaft coupling portions 4 and 5 are joined by an auxiliary shaft coupling 12 which can be engaged and disengaged. Good to engage. Therefore, the end portion of the tubular portion on the side of the flange 2 and the shaft coupling ring 1
Crown gear teeth 13 are provided on each of the four. During normal operation, the coil spring 18 causes the shaft coupling ring 14 to slide by the spline 17, and the auxiliary shaft coupling is disengaged. By displacing the pressure ring 16 in the axial direction toward the release ring 11, the auxiliary shaft coupling 12 can be operated. Therefore, the hydraulic cylinder 15 or an electromagnetic solenoid 2 equivalent to the hydraulic cylinder 15 is used.
6 is used to apply an axial force to the pressure ring.

The actuation device for the pressure ring 16, whether the hydraulic cylinder 15 or the solenoid 26, is non-rotatably fixed near the shaft coupling assembly. Preferably, the pressure ring 16 is provided with two or more hydraulic cylinders 15 or electromagnetic solenoids 26 so that the shaft coupling 14 can be pressed uniformly toward the teeth 13. The dimensions of the auxiliary shaft coupling 12 are determined in consideration of the outer diameter of the auxiliary shaft coupling 12, so that the machine can be driven for a short time and the rotational torque sufficient to remove the cause of the operation of the safety shaft coupling can be obtained. It is defined so that it can be transmitted between the five.

The teeth 13 preferably have slanted sides. By doing so, the axial force generated by the transmitted rotational torque is transmitted to the coil spring 18. A predetermined transmission torque is achieved, the teeth 13 automatically
Is disengaged. As a result, the auxiliary shaft joint 12 can also act as a safety shaft joint.

FIG. 2 shows an embodiment of a shaft coupling assembly similar to that of FIG. 1, in which the auxiliary shaft coupling 22 is
It has an integral actuation mechanism. That is, the shaft coupling ring 2
4 is configured as a cylinder that is slidable in the axial direction. The pressure medium is supplied to the cylinder by means of a rotary pipe joint 2 which is axially supported by a shaft joint ring 24 in a sealable manner.
5 via the hose 23. The supplied pressure is transmitted radially inward. The angled end piece of the friction sleeve 6 acts as a fixed piston in the cylindrical structure of the shaft coupling ring 24. Hose 23
Can be installed when the safety shaft coupling is activated and emergency operation by the auxiliary shaft coupling 22 is required. In this way, the hose 25 can be an emergency structure that is provided only during an emergency operation accompanying the operation of the safety shaft coupling.

FIG. 3 shows a shaft coupling assembly with a safety shaft coupling similar to the embodiment shown in FIGS. In this case, an auxiliary shaft coupling is provided as a friction clutch that can be engaged and disengaged. Inner annular friction plate 33
Is provided on the outer periphery of the tubular portion on the flange 2 side, and the outer friction plate 34 is provided on the inner peripheral surface of the release ring 11, and by the electromagnet 36 provided on the outer side of the anchor plate 35 and the shaft coupling assembly. The frictional engagement of the auxiliary shaft coupling can be achieved. The release ring 11 is fixed on the friction sleeve 6 so that it cannot move in the axial direction.

FIG. 4 shows an embodiment of a shaft coupling assembly similar to that shown in FIG. 3, in which the auxiliary shaft coupling 42 has an integrally rotatable electromagnet 46 fixed to the release ring 11. Is equipped with. The supply of electric current to the electromagnet 46 is achieved by using the slip ring 43 and the brush 44.

In the structure of the auxiliary shaft joint which can be engaged and disengaged shown in FIGS. 1 to 4, it is possible to selectively engage and disengage the auxiliary shaft joint by using fluid pressure or electromagnetic force. It was The operation is performed by a non-rotatable electromagnet provided near the auxiliary shaft joint, which does not use a slip ring, or by supplying a pressure medium through a rotary pipe joint, or by using a combination of a slip ring and a brush. It is realized by supplying.

The auxiliary shaft coupling 52 included in the shaft coupling assembly shown in FIG. 5 cannot be disengaged. The release ring 11 is connected to the friction sleeve 6 via a friction plate 53. The release ring 11 is provided with a pair of conical surfaces facing outward in the axial direction, and is biased by the coil spring 55 in the expanding direction along the axial direction, respectively, of the release ring 11 and the friction plate 53. A pair of friction rings 54 are provided that abut the corresponding conical surfaces. The inner peripheral surface of the friction ring 54 is joined to the outer peripheral surface of the tubular portion on the flange 2 side by a spline 56 so as to rotate integrally. Thus, via the axial end surface of the flange 2, the friction ring 54, and the friction sleeve 6 and the release ring 11 or the friction plate 54,
The engaged state is always maintained between both shaft coupling portions.

Due to the function of the expansion element 8, the safety shaft coupling is
When the rotational torque is frictionally transmitted between the two shaft coupling portions 4 and 5, the auxiliary shaft coupling 52 is in the inoperative state. When an excessive rotational torque is generated and the safety shaft coupling is brought into the disengaged state, the auxiliary shaft coupling 5 immediately transmits the rotational torque between the both shaft coupling portions 4 and 5, and slippage in the auxiliary shaft coupling 52 is possible. The drive state is achieved. A feature of this embodiment is that the actuation of the auxiliary shaft joint does not require any control action, and therefore the structure for it is unnecessary, which is the response of the emergency operation of the auxiliary shaft joint 52. Can be increased. Further, the auxiliary shaft coupling 52 can also operate as a safety shaft coupling.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a safety shaft coupling including an auxiliary shaft coupling according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a second embodiment of a safety shaft coupling including an auxiliary shaft coupling including an integral hydraulic actuation mechanism according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a third embodiment of a safety shaft coupling provided with an electromagnetically disengageable friction type auxiliary shaft coupling according to the present invention.

FIG. 4 is a longitudinal sectional view showing a fourth embodiment of a safety shaft coupling having an auxiliary shaft coupling using an integral electromagnet according to the present invention.

FIG. 5 is a vertical cross-sectional view showing a fifth embodiment of a safety shaft coupling including an auxiliary shaft coupling that does not require engagement / disengagement control according to the present invention.

[Explanation of Codes] 1 Safety shaft joint 2 Flange 3 Shaft 4, 5 Part 6 Friction sleeve 7 Bearing 8 Expansion element 9 Pressure chamber 10 Screw pipe joint 11 Release ring 12 Auxiliary shaft joint 13 Teeth 14 Shaft coupling ring 15 Hydraulic cylinder 16 Pressure ring 17 Spline 18 Coil spring 22 Auxiliary shaft joint 24 Axial joint ring 25 Rotary pipe joint 32 Auxiliary shaft joint 33, 34 Friction plate 35 Anchor plate 36 Electromagnet 42 Auxiliary shaft joint 43 Slip ring 44 Brush 46 Electromagnet 52 Auxiliary shaft joint 53 Friction Plate 54 Friction ring 55 Coil spring 56 Spline

Claims (14)

[Claims] 1. A two shaft coupling portion coaxially and mutually opposed to each other so as to be frictionally engageable by a hydraulic expansion element, and pivotally assembled so as to face each other. In a friction engagement type safety shaft coupling capable of interrupting power transmission depending on load, when the safety shaft coupling 1 interrupts power transmission by the shaft coupling 1, both shaft coupling portions 4, 5 are engaged with each other. A shaft coupling, characterized by including auxiliary shaft couplings 12, 22, 32 as second shaft couplings provided between both shaft coupling portions 4, 5 so as to fit together. 2. The shaft coupling according to claim 1, wherein the auxiliary shaft couplings 12, 22, 32 are slippable. 3. The shaft coupling according to claim 1, wherein the both shaft coupling portions 4 and 5 are constantly engaged by the auxiliary shaft coupling 52. 4. The friction ring 5 in which the auxiliary shaft joint 52 is axially spring-biased between the both shaft joint portions 4, 5.
4. A shaft coupling according to claim 3, comprising a conical friction shaft coupling with 4. 5. The shaft joint according to claim 1, wherein the auxiliary shaft joints 12 and 22 are configured as engageable and disengageable shaft joints. 6. The shaft coupling according to claim 5, wherein the auxiliary shaft couplings 32, 42 are electromagnetic friction shaft couplings 33, 34, 35, 36 controlled from the outside. 7. The shaft joint according to claim 5, wherein the auxiliary shaft joint is configured as a hydraulically operated friction shaft joint. 8. The shaft coupling according to claim 1, wherein the auxiliary shaft coupling 12 is composed of shaft couplings 13, 14 and 15 capable of lock engagement. 9. The shaft joint according to claim 8, wherein the auxiliary shaft joint 12 is a shaft joint that can be engaged from the outside and that can be disengaged by a load. 10. The auxiliary shaft coupling 12 has members 2 and 14 having crown gear teeth 13, and the teeth of both members engage with each other due to the axial sliding motion of these members, and Since the tooth 13 has an inclined side surface, the auxiliary shaft coupling 12 is blocked by an axial force generated from the side surface of the tooth 13 as the load increases. The shaft coupling according to item 9. 11. The shaft coupling according to claim 10, wherein the auxiliary shaft coupling 12 is electromagnetically operable. 12. The device according to claim 6, wherein the actuating device of the auxiliary shaft couplings 12, 22 is fixed in the vicinity of the shaft coupling assembly without rotational movement. Shaft coupling. 13. The working cylinder of the auxiliary shaft coupling 22 is fixed to a shaft coupling assembly, and fluid is supplied to the cylinder from outside via rotary pipe couplings 23, 25. Claim 9 or 1
The shaft coupling described in 0. 14. An operating electromagnet 3 for the friction shaft coupling.
7. The shaft coupling according to claim 6, wherein 6 is fixed to the shaft coupling assembly 12, and a current is supplied to the electromagnet by using a slip ring 43 and a brush 44.