KR102534414B1 - Flexible coupling and device for testing the same - Google Patents

Abstract

Disclosed is a flexible coupling that has a safety means capable of protecting devices when excessive torque is applied and can efficiently prevent a fire caused by abrasion between metals. A flexible coupling is a flexible coupling for transmitting power by connecting an input shaft and an output shaft, comprising: a first flange fastened to one shaft; a second flange spaced apart from the first flange in an axial direction and fastened to another shaft; a thin plate-shaped diaphragm connected to the first flange and the second flange and extending in a radial direction; and a shear bolt provided between the second flange and the diaphragm to cut off power when a predetermined or more torque is applied.

Description

Flexible coupling and its testing device {FLEXIBLE COUPLING AND DEVICE FOR TESTING THE SAME}

The present invention relates to a flexible coupling, and more particularly, to a flexible coupling connected between an engine such as an aircraft and a gearbox to perform a function of transmitting power, and a test device thereof.

In general, a coupling is a shaft connecting device that connects a drive shaft and a driven shaft, and various couplings such as fluid couplings, gear couplings, and flexible couplings are provided depending on the shape. In addition, an appropriate type of coupling is selected in consideration of an appropriate torque range, torsional strength, eccentricity error absorption, and appropriate number of rotations according to the place of use.

For example, in the case of an aircraft, a power transmission shaft is installed between an engine and a gearbox to transmit power of the engine to the gearbox. In this case, since vibrations and shocks occur due to the nature of the aircraft, a flexible couple that absorbs these vibrations and shocks and ensures that the power of the engine is continuously transmitted to the gearbox even if the axis center is eccentric between the engine, the power transmission shaft, and the gearbox. ring is used. These flexible couplings are rigid in the rotational direction, but ductile in the axial direction.

A flexible coupling has been disclosed in previously filed US Patent Publication No. 4802882. A conventional flexible coupling includes a first connection part connected to a power transmission shaft, a second connection part connected to a mating device (engine or gearbox), and disposed between the first connection part and the second connection part to form the first and second connection parts It consists of a diaphragm that connects the fluidly.

The diaphragm movably connects the first and second connection parts in an axial direction by installing a plurality of diaphragm members between the first and second connection parts. The flexible coupling absorbs vibration or shock occurring in the aircraft and at the same time maintains a connection state between the engine, power transmission shaft, and gearbox even if the shaft center is eccentric, so that the power of the engine can be transmitted to the gearbox. .

1 is a cross-sectional view showing a conventional power transmission shaft.

As shown in FIG. 1, the conventional power transmission shaft 1 includes a main shaft 13 and flanges 11 provided on both sides of the main shaft 13 and connected to the engine or gearbox side. . A flexible coupling 12 is provided at the rear end of the flange 11, and the flexible coupling 12 is assembled to the flange 11 and the main shaft 13 by welding. The flexible coupling 12 serves to compensate for a mismatch between the axes of the engine and the gearbox.

The flexible coupling 12 is composed of a contoured diaphragm assembly and is configured not to fail from fatigue during a desired life cycle. The power transmission shaft 1 is equipped with an anti-flailing mechanism to prevent the shaft from swinging (whirling, whipping) when the flexible coupling 12 is damaged. If the power transmission shaft 1 fluctuates within the aircraft, peripheral devices are damaged, resulting in fatal damage to aircraft operation.

The anti-sway mechanism may be composed of a ball joint (14). The ball joint 14 restricts movement in the axial and radial directions, and performs a function of allowing only rotational movement in the center of the flexible coupling 12 . The ball joint 14 compensates for an axis mismatch between the engine side and the gearbox side by the rotated angle. The ball joint 14 may be composed of a ball having lubrication and having a hole in the center, and a housing that restrains the ball. The housing is fixed to the flange 11 with bolts or the like. The main shaft 13 is connected to the central hole of the ball joint 14 on both sides, and the axial and radial movements are restrained, thereby preventing axial fluctuation.

Conventional flexible couplings have a problem of damaging internal parts because there is no safety device when excessive torque is applied. If the safety device is provided in the coupling, there is a problem that the structure becomes complicated or the manufacturing cost increases. In addition, there is a need to provide a flexible coupling having excellent durability while having a safety device.

On the other hand, conventional flexible coupling test equipment installs an input motor on one side of the flexible coupling and an output motor on the other side to test the load for coupling and shaft torsion in various environments do However, the conventional flexible coupling test apparatus requires two motors of an input side and an output side, and there is a problem in that installation cost increases.

US Patent Publication No. 4802882

In order to solve such conventional problems, the present invention provides a flexible coupling that has a safety means capable of protecting devices when excessive torque is applied and can efficiently prevent a fire caused by abrasion between metals.

In addition, the present invention provides a testing device for a flexible coupling capable of effectively performing a torsional load test of a coupling and a shaft using only one motor and reducing installation costs.

A flexible coupling according to the present invention is a flexible coupling for transmitting power by connecting an input shaft and an output shaft, comprising: a first flange fastened to one shaft; a second flange spaced apart from the first flange in an axial direction and fastened to another shaft; a thin plate-shaped diaphragm connected to the first flange and the second flange and extending in a radial direction; and a shear bolt provided between the second flange and the diaphragm to cut off power when a predetermined or more torque is applied.

In addition, a connection flange is provided between the diaphragm and the first flange in the axial direction, one side of the connection flange is coupled to the diaphragm in the axial direction, and the other side of the connection flange is fastened to the first flange through a shear bolt.

The shear bolt is fastened by penetrating the connection flange and the first flange in the axial direction, and a notch groove recessed in the radial direction is formed on an outer circumferential surface of the shear bolt positioned between the connection flange and the first flange.

A wear plate for preventing fire due to intermetallic wear is provided between the connection flange and the first flange, and a through hole through which a shear bolt passes is formed in the wear plate.

A ball joint provided between the first flange and the second flange and having one side coupled to the first flange and the other side coupled to the second flange, wherein the ball joint has an axial direction between the first flange and the second flange. and constraining movement in the radial direction and allowing movement in the rotational direction.

A test device for a flexible coupling according to the present invention is a test device for a pair of flexible couplings and a main shaft coupled between the flexible coupling, comprising: an input shaft fastened to one flexible coupling; an input shaft motor providing power to rotate the input shaft; and an output shaft connected to the other flexible coupling, wherein the output shaft is installed to rotate idle by a bearing, and the input shaft and the output shaft are displaced from each other and rotated on different axes, among the input shaft and the output shaft A torsional load test is performed with only rotation of a single input shaft motor by including a torsion fixing unit for fixing at least one shaft in a twisted state in the rotational direction of the shaft.

The set consisting of the input shaft, the output shaft, the torsion fixing unit, a pair of flexible couplings, and the main shaft are installed radially and spaced side by side, and a gear is installed on at least one of the input shaft and output shaft of each set to provide two The sets are gear-connected, and two sets are rotated only by the rotation of the single input shaft motor, one set rotates in a torsionally fixed state in a clockwise direction by the torsion fixture, and the other set is rotated to the torsion fixture. rotated counterclockwise by twisting in a fixed state.

The flexible coupling and its test device according to the present invention can effectively prevent damage to equipment and fire caused by abrasion between metals by blocking power (fuse function) when abnormal rotation occurs, such as when excessive torque is applied. In addition, it is possible to effectively perform a torsional load test of a coupling and a shaft using only one motor and reduce installation costs.

1 is a cross-sectional view showing a conventional power transmission shaft;
Figure 2 is a front view showing a flexible coupling according to an embodiment of the present invention,
Figure 4 is a perspective view showing a shear bolt according to an embodiment of the present invention,
5 is a perspective view showing a part of a flexible coupling according to an embodiment of the present invention in isolation;
6 is a front view showing a test apparatus for a flexible coupling according to an embodiment of the present invention;
7 is a cross-sectional view showing a torsion fixing unit according to an embodiment of the present invention.

Hereinafter, the technical configuration of the flexible coupling and its test apparatus will be described in detail according to the accompanying drawings.

2 to 5, the flexible coupling 1 according to an embodiment of the present invention connects the input shaft 11 and the output shaft 12 to transmit power. The flexible coupling 1 includes a first flange 20, a second flange 30, a diaphragm 40, a connecting flange 50, a shear bolt 60, and a ball joint 80 It is done by

The first flange 20 is fastened to one shaft, and in this embodiment, the first flange 20 is fastened to the input shaft 11. A flange 111 is provided at an end of the input shaft 11 , and the first flange 20 may be screwed to the flange 111 of the input shaft 11 .

The second flange 30 is axially spaced from the first flange 20 and fastened to the other shaft. In this embodiment, the second flange 30 is fastened to the output shaft 12. A flange 121 is provided at an end of the output shaft 12 , and the second flange 30 may be screwed to the flange 121 of the output shaft 12 .

The diaphragm 40 has a thin plate shape, connects the first flange 20 and the second flange 30, and extends in the radial direction. The diaphragm 40 is manufactured by welding two thin plates. The flexible coupling (1) transmits power by connecting the two rotation shafts when there is a slight misalignment between the two rotation shafts in the rotating equipment.

In the case of a high-speed rotating body, there are frequent cases in which the shaft is distorted due to minute vibrations generated by the equipment and the equipment malfunctions. That is, the diaphragm 40 must allow torque and axis alignment during rotation, and absorb irregular vibrations generated when the axis is misaligned.

The two thin plates are welded, the diaphragm 40 and the second flange 30 are welded, and the diaphragm 40 and the connection flange 50 are welded.

The connection flange 50 is provided between the diaphragm 40 and the first flange 20 in the axial direction. One side of the connection flange 50 is coupled to the diaphragm 40 in the axial direction, and the other side of the connection flange 50 is fastened to the first flange 20 through the shear bolt 60.

The shear bolt 60 is provided between the first flange 20 and the diaphragm 40, and functions to cut off power when a certain amount of torque is applied. The shear bolt 60 is fastened by penetrating the connection flange 50 and the first flange 20 in the axial direction. In addition, a notch groove 61 recessed in the radial direction is formed on the outer circumferential surface of the shear bolt 60 located between the connecting flange 50 and the first flange 20.

The shear bolt 60 is composed of a head portion 62 and a pillar portion 63, and a notch groove 61 is recessed along the outer circumferential surface of the pillar portion 63. The diameter of the notch groove 61 is smaller than the diameter of the pillar portion 63 . When more than a certain torque is applied to the rotating shaft, the notch groove 61 having the smallest cross-sectional area is first broken, and the first flange 20 rotates with respect to the connection flange 50 to cut off power.

In addition, the flexible coupling (1) is provided with a wear plate (70). The wear plate 70 is provided between the connection flange 50 and the first flange 20, and functions to prevent fire due to wear between metals. A central hole 72 for passing the ball joint 80 is formed in the center of the wear plate 70, and a through hole 71 passing the shear bolt 60 is formed along the circumference.

In addition, a center hole 22 for penetrating the ball joint 80 is formed in the first flange 20 to correspond to the wear plate 70, and a through hole 21 passing the shear bolt 60 is formed around the circumference. is formed along

The ball joint 80 is provided between the first flange 20 and the second flange 30, and one side is coupled to the first flange 20 and the other side is coupled to the second flange 30. The ball joint 80 constrains movement between the first flange 20 and the second flange 30 in the axial and radial directions, and allows movement in the rotational direction.

The ball joint 80 is fastened to the first flange 20 through bolts, and passes through the wear plate 70, the connection flange 50, the diaphragm 40, and the second flange 30 in turn to remove the first flange from the other side. It is coupled with 2 flanges (30). The ball joint 80 is composed of a ball having a lubricity and a hole formed in the center and a housing that restrains the ball. Meanwhile, the ball joint 80 may be implemented in the form of a sleeve bearing as in the present embodiment, or may be implemented in the form of a ball bearing in another embodiment.

6 and 7, the flexible coupling test apparatus according to an embodiment of the present invention includes a pair of flexible couplings 1 and a main shaft 150 coupled between the flexible couplings 1 is a torsional load test device of The flexible coupling test device includes an input shaft 120, an input shaft motor 110, an output shaft 130, and a torsion fixing unit 160. The main shaft 150 may be a power transmission shaft (P.T.O. shaft) connecting an engine and a gear box of an aircraft.

Input shaft 120 is fastened to one side flexible coupling (1). The input shaft motor 110 is coupled to the input shaft 120 and provides power for rotating the input shaft 120 . The output shaft 130 is connected to the other flexible coupling 1. In this case, the output shaft 130 is installed to idle rotate by a plurality of bearings 170 . The input shaft 120 and the output shaft 130 are displaced and rotated on different axes (misalignment).

The torsion fixing unit 160 fixes at least one of the input shaft 120 and the output shaft 130 in a twisted state in the rotational direction of the shaft. That is, the torsion fixing part 160 is composed of a housing 161 surrounding the outer circumferential surface of the input shaft 120 or the output shaft 130 and a fixing bolt 162 fastened to the outer circumferential surface of the input shaft 120 or the output shaft 130. . The torsion fixing part 160 fixes the input shaft 120 or the output shaft 130 in a twisted state, and a load is generated while the main shaft 150 coupled between the flexible couplings 1 is also twisted.

As a result, the torsional load test can be performed only by rotation of the single input shaft motor 110 . That is, compared to performing a torsional load test on the main shaft to be tested by controlling the existing input shaft motor and output shaft motor respectively, the present invention twists and fixes the shaft in advance before the test through the torsion fixing unit 160, and then single input shaft It is possible to perform a torsional load test only with the motor 110 .

More preferably, two sets 100 and 100a are installed side by side with respect to the flexible coupling and the main shaft to be tested. That is, one set (100: Set) is formed by the input shaft 120, the output shaft 130, the torsion fixing part 160, a pair of flexible couplings 1 and the main shaft 150. Similarly, another set 100a consisting of an input shaft 120a, an output shaft 130a, a torsion fixing part 160a, a pair of flexible couplings 1a, and a main shaft 150a is parallel in the radial direction. install at a distance

In addition, a gear 140 is installed on at least one of the input shaft 120 and the output shaft 130 of each set so that the two sets 100 and 100a are gear-connected. Accordingly, only the rotation of the single input shaft motor 110 rotates the two sets 100 and 100a. In this case, all parts such as bearings 170 and 170a and gears 140 and 140a, except for the input shaft motor 110, are identically configured as two sets 100 and 100a.

In addition, one set 100 is rotated in a clockwise torsion fixed state by the torsion fixing part 160, and the other set 100a is torsionally fixed in a counterclockwise direction by the torsion fixing part 160a. rotated as That is, after the two sets 100 and 100a are fixed in different torsion directions, a torsional load test is performed while being rotated by a single input shaft motor 110 . Through this configuration, a stable and precise test can be performed in a torsionally fixed state while the two sets 100 and 100a cancel forces according to torsion states in different directions.

So far, the flexible coupling and its test device according to the present invention have been described with reference to the embodiment shown in the drawings, but this is only exemplary, and anyone skilled in the art can make various modifications and equivalent other embodiments therefrom. will understand Therefore, the true scope of technical protection should be determined by the technical spirit of the appended claims.

1: flexible coupling 20: first flange
30: second flange 40: diaphragm
50: connection flange 60: shear bolt
61: notch groove 70: wear plate
80: ball joint 100,100a: set
110: input shaft motor 150: main shaft
160: torsion fixing part

Claims (7)

delete delete delete delete delete delete A test device for a pair of flexible couplings and a main axis coupled between the flexible couplings,
An input shaft fastened to one side flexible coupling;
an input shaft motor providing power to rotate the input shaft; and
It includes an output shaft connected to the other flexible coupling,
The output shaft is installed to rotate idle by a bearing,
The input shaft and the output shaft are displaced and rotated on different axes,
A torsion fixing unit for fixing at least one of the input shaft and the output shaft in a twisted state in the rotational direction of the shaft is provided, and a torsional load test is performed only by rotation of a single input shaft motor,
A set consisting of the input shaft, the output shaft, the torsion fixing unit, a pair of flexible couplings, and the main shaft is installed parallel to and spaced apart in the radial direction,
A gear is installed on at least one of the input shaft and output shaft of each set so that the two sets are geared,
Two sets are rotated only by the rotation of the single input shaft motor,
A test device for a flexible coupling in which one set is rotated in a torsionally fixed state in a clockwise direction by a torsion fixing unit, and the other set is rotated in a torsionally fixed state in a counterclockwise direction by a torsion fixing unit.

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