KR100551584B1 - Coupling having freely three-dimensional movability - Google Patents

Abstract

The present invention relates to a shaft coupling connecting two shafts, comprising: a first coupling boss coupled to one shaft, a central block coupled to the first coupling boss, and another shaft coupled to the central block. In the axial coupling formed by the second coupling boss coupled to the sequential coupling in the Z direction in the longitudinal direction,

The center block may include a first block coupled to the first coupling boss in a X direction and a second block coupled to the second coupling boss in a Y direction perpendicular to the X direction. Consisting of;

The first block and the second block may be coupled relative to each other in the Z direction perpendicular to the X and Y directions.

According to the present invention, the shaft coupling is configured to have freedom in the three-dimensional direction, and thus the shaft position can be adjusted to simultaneously absorb various types of coupling errors with only one shaft coupling, so that the rotation torque transmission can be smoothly performed. have.

In addition, the shaft coupling of the present invention has the effect of easy axis correction work, assembly and maintenance work, at the same time low production cost, and has a long life.

Shaft coupling, first coupling boss, second coupling boss, center block, first block, second block

Description

Axis Coupling with Freedom in Three Dimensional Directions {COUPLING HAVING FREELY THREE-DIMENSIONAL MOVABILITY}             

1 is a schematic view of a mobile coupling mechanism composed of a pin and a slide groove,

2 is a schematic diagram showing three axial movements of X, Y, and Z of the mobile coupling mechanism according to FIG.

Figure 3 is a schematic cross-sectional view showing one embodiment of the axial coupling having freedom in the three-dimensional direction of the present invention.

4 is a view illustrating a coupling relationship between a coupling boss and a central block in FIG. 3;

5 is a view showing a coupling relationship of the central block in FIG.

6 is a right side view of the first block constituting the center block, a left side view of the second block,

7 is a flowchart illustrating an assembly process of the shaft coupling of FIG. 3.

<Description of the symbols for the main parts of the drawings>

b1 ... first coupling boss, b2 ... second coupling boss,

P ... pin. S ... set screw,

B ... middle block, I, II ... axis,

100 ... first block, 110 ... first coupling boss coupling portion,

111 ... slide grooves, 112 ... bearings,

120 ... second block counterpart, 121 ... slide groove,

122 bearing, 200 second block,

210 ... second coupling boss coupling, 211 ... slide groove,

212 bearing, 220 first block counterpart,

221 ... slide grooves, 222 ... bearings.

The present invention relates to a shaft coupling connecting two axes, and more particularly, to a shaft coupling having freedom in a three-dimensional direction that can freely move in the three-dimensional direction to absorb an error occurring when connecting the shaft.

In general, as a shaft coupling for transmitting torque of a rotating shaft, the simplest one is a fixed coupling by simple machining on a cylindrical material such as a pipe, and such a coupling is currently commercially available. However, the fixed coupling as described above assumes, for example, that the rotational shaft of the electric motor and the rotational axis of the rotational side device are connected. Since it is fixed, the position cannot be adjusted and the error between the connecting shafts cannot be eliminated.

There are three types of errors between connecting shafts: angular error, parallel error (eccentric error), and error due to the clearance between shaft ends. These three kinds of errors exist at the same time. Theoretically, connecting the two axes completely on a straight line eliminates the error between the connecting axes, but connecting the axes in this way is empirically impossible and necessarily results in attachment errors.

When the error between the connecting shafts is large enough to exceed the error correction limit of the shaft coupling, the two axes cannot be connected. In this case, it is necessary to reattach to correct the shaft position or to replace the shaft coupling with error correction function to absorb the error.

However, at present, there is no commercially available shaft coupling capable of sufficiently absorbing the three kinds of errors described above and correcting the shaft position. For example, only one universal joint cannot correct parallel error (eccentric error). Elastic couplings such as leaf springs, bellows and rubber, as well as gear and chain couplings, cannot absorb three types of errors at the same time. Oldham coupling absorbs a small angular error and parallel error, but when the transmission torque is large, there is a problem in that the wear of the coupling fitting is large and cannot afford it.

Therefore, there is a demand for a coupling capable of smoothly transmitting torque while simultaneously absorbing errors due to angular error, parallel error, and clearance between shaft ends by only one shaft coupling.

 According to the present invention, the shaft coupling is configured to have freedom in the three-dimensional direction, so that only one shaft coupling can simultaneously absorb various types of connecting shaft errors, thereby providing a shaft coupling capable of smoothly rotating torque transmission. It aims to do it.

Moreover, an object of this invention is to provide the shaft coupling which is easy for an axis | shaft correction work, an assembly, and a maintenance work.

In addition, an object of the present invention is to provide a shaft coupling having a low production cost and a long service life.

In order to achieve the above object, the shaft coupling of the present invention, the first coupling boss coupled to one axis, the central block coupled to the first coupling boss, and the other shaft coupled to the central block at the same time In the axial coupling formed by the second coupling boss coupled to the sequential coupling in the Z direction in the longitudinal direction,

The center block may include a first block coupled to the first coupling boss in a X direction and a second block coupled to the second coupling boss in a Y direction perpendicular to the X direction. Consisting of;

The first block and the second block may be coupled relative to each other in the Z direction perpendicular to the X and Y directions.

Preferably, the first block is coupled to the first coupling boss rotatably about the X direction axis, and the second block is coupled to the second coupling boss rotatably about the Y direction axis.

In addition, the first coupling boss and the first block, the second block and the second coupling boss is provided on one side of the boss or block, the pin protruding in the movement direction and the other side corresponding to the boss or block A plurality of bearings are formed in the block or the boss, and a plurality of bearings are installed along the inner circumference thereof, and the pins may be coupled to each other so as to be movable relative to each other.

The first block and the second block may include a slide groove formed in one of the blocks and extending in the Z-axis direction and provided with a plurality of bearings along the inner circumference thereof, and provided in the other one of the blocks in the Z-axis direction. Protrudingly extending may be coupled relative to each other by the coupling of the pin is inserted into the slide groove.

The bearing may be a spherical bearing or a linear slide bearing.

In addition, the first block and the second block may be provided with both the slide groove and the pin in the coupling position corresponding to each other, it may be coupled relative to the slide groove by the coupling of the slide groove and the pin.

On the other hand, the first block and the second block is provided by one of the blocks, the spline shaft protruding and extending in the Z-axis direction, and the spline nut groove formed in the other one of the blocks and the spline shaft is inserted by It can be coupled to move relative to the Z-axis direction.

The first block and the second block may include both the spline shaft and the spline nut groove at coupling positions corresponding to each other, and may be coupled to be movable relative to each other by coupling the spline shaft and the spline nut groove.

In addition, the first block and the second block is preferably a block of the same type.

Moreover, it is preferable that the said 1st coupling boss and the 2nd coupling boss are coupling bosses of the same kind.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

First, the structure that can absorb the error between the connecting axis will be considered. In order to absorb the angle error, a rotation mechanism for angle correction is required. In addition, the absorption of the parallel error requires a moving mechanism of the coupling in the X-axis direction and the Y-axis direction when the axial length direction is assumed as the Z-axis direction. In order to absorb the play of the shaft end, a mechanism for stretching in the Z direction in the longitudinal direction of the shaft is required. That is, in order to absorb the error between three types of connecting shafts, a mechanism for correcting the position by linearly moving in the three-dimensional directions of the axial coupling in the X-axis direction, the Y-axis direction, and the Z-axis direction (the longitudinal direction of the axis) is indispensable. In particular, the expansion and contraction in the Z-axis direction (axis longitudinal direction) absorbs errors in the X-axis and Y-axis directions in addition to the absorption of the play at the shaft end. Stretching in the Z-axis direction is indispensable for the correction of all the fitting positions.

By integrating such movement mechanisms in three directions, it is possible to absorb all of the angular error, parallel error, and play of the shaft end. The amount of freedom in the coupling to absorb the error, ie the amount that changes in response to position, is much greater than the amount of change in the material or spring.

The coupling of the present invention focuses on the technical idea of integrating and combining three moving mechanisms in three directions, and the two couplings are configured to move relative to three directions of X, Y, and Z axes. Doing.

In order to ensure smooth movement in the three-dimensional directions of the X-axis, Y-axis, and Z-axis, coupling between the spline shaft and the spline nut groove or coupling between the pin and the bearing groove with the bearing may be considered. The present invention is not limited thereto, and any mobile coupling mechanism capable of smoothly moving the position satisfies the structure of the present invention.

1 and 2, there is shown a movable coupling mechanism consisting of a slide groove with a pin and a bearing embedded therein. In Fig. 1 (a), a relative moving member having a slide groove (for example, a center block B described later) is disclosed, and bearing grooves are formed at regular intervals along the inner circumference of the slide groove. Fig. 1 (b) shows a state in which a bearing is installed in the bearing groove of the slide groove inner circumference, and the bearing is installed so as not to protrude again after being fitted into the bearing groove. Figure 1 (c) shows a state in which the pin, which is another relative moving member is inserted into the slide groove.

Referring to FIG. 2, it can be seen that the relative moving member configured by FIG. 1 and the pin corresponding to the relative moving member may be moved relative to the X, Y, and Z axes, respectively.

Figure 3 shows a shaft coupling as an embodiment of the present invention using a pin and a slide groove as shown in Figures 1 and 2 as a relative movable coupling mechanism.

The shaft coupling may include a first coupling boss b1 fixedly coupled to one shaft I, a central block B coupled to the first coupling boss b1, and the central block B. The second coupling boss (b2) is coupled to the other shaft (II) and fixedly coupled to the other axis (II) is made by sequentially coupling in the Z direction in the longitudinal direction of the axis.

4 is a view illustrating a coupling relationship between a coupling boss and a center block in FIG. 3.

As shown in FIG. 4, the first coupling boss b1 and the second coupling boss b2 are connected to the coupling parts 110 and 210 which are coupled to the central block B, respectively. Direction) and a pin P extending in the Y-axis direction, and both ends of the pin P are fixed by a stop screw S. A corresponding coupling portion of the central block (B) for coupling with the first coupling boss (b1) (coupling portion of the first block 100 to be described later; 110) and the central coupling with the second coupling boss (b2) In the corresponding coupling portion of the block B (coupling portion of the second block 200 to be described later; 210) slide grooves 111 and 211 having bearings 112 and 212 installed in the inner circumference thereof are formed, respectively, so that the center block B By sliding the pins (P) attached to the first and second coupling boss (b2) in a linear direction by the action of the bearing to move to a free position, it is automatically adjusted in the two-dimensional direction of the X-axis, Y-axis. Therefore, absorption of parallel error at the time of shaft connection becomes possible.

In addition, the first coupling boss (b1) connected to the central block (B) and the shaft (I) can be rotated relative to the X direction axis by the action of the bearing (112). Similarly, the center block (B) and the second coupling boss (b2) can also be rotated relative to the Y direction axis. As a result, the two shafts connected to the shaft coupling can rotate for angle correction, thereby absorbing the angle error.

For convenience, the first coupling boss b1 and the second coupling boss b2 are divided and displayed in order, but the coupling bosses are of the same kind. That is, by placing two coupling bosses of the same type opposite to each other with the mating surfaces provided with pins so that the pin extending direction is perpendicular to each other, the center block B is joined to the mating surfaces. It is configured to be moved in the X-axis and Y-axis direction, respectively. In this manner, when the coupling boss is the same type, the coupling configuration can be simplified, thereby lowering the production cost and facilitating compatibility of the parts. Further, the assembling and maintenance work of the coupling boss in both directions of the center block B is simplified as a repetitive work.

In addition, for example, a slide groove is provided on the coupling boss side and a pin P is provided on the central block B side to reverse the configuration of the corresponding coupling portion of each coupling boss and the central block B. It is possible.

FIG. 5 is a diagram illustrating a coupling relationship between the central blocks in FIG. 3, and FIG. 6 is a right side view of the first block constituting the center block and a left side view of the second block.

As shown in FIG. 5, the center block B may include a first block 100 and a second coupling boss b2 coupled to the first coupling boss b1 so as to be movable relative to each other in the X direction. ) Is composed of a second block 200 coupled to be movable relative to the Y direction perpendicular to the X direction, wherein the first block 100 and the second block 200 are Z perpendicular to both the X and Y directions It is coupled so as to be relatively movable in the direction, so that it is possible to absorb three kinds of connection errors, in particular, errors caused by play at the shaft ends.

The first block 100 and the second block 200 are provided with coupling parts 110 and 210 having slide grooves formed on the side of the first block 100 and the coupling block. In addition, a plurality of slide grooves 121, 221 and pins P are located at opposite sides of the coupling part, that is, the relative coupling parts 120 and 220 of the first block 100 and the second block 200, respectively. It is arranged. In the illustrated embodiment, two pins (P) are arranged in pairs opposite to each other on the mating coupling parts 120 and 220 of each block, and two slide grooves 121 and 221 are also arranged in pairs opposite to each other. . The pin P and the slide groove are disposed such that the straight line connecting the pair of pins P and the straight line connecting the pair of slide grooves are vertical. The first block 100 and the second block 200 are disposed so that their relative coupling parts face each other such that the pin P of one block is coupled to the slide groove of the other block.

The combined first block 100 and the second block 200 may change their relative positions by the pin P sliding linearly in the slide groove by the action of the bearings 122 and 222. As a result, relative movement in the Z-axis direction can be ensured.

The central block B is composed of two blocks, but there is only one type of block. If the same kind of blocks constituting the central block B is made in this way, the coupling structure can be simplified and produced. Lower costs and easier component compatibility. In addition, the assembly and maintenance work of the central block (B) and the coupling is simplified as a repetitive work.

Fig. 7 is a diagram showing the assembling procedure of the shaft coupling of the present invention.

The assembly sequence of the shaft coupling of this invention is as follows.

1) Attach one side of the first coupling boss (b1) to a fixed shaft (I). At this time, the coupling boss is left in a free state not fixed to the shaft (I).

2) A second coupling boss (b2) is also attached to the other shaft (II) and made the same.

3) The first coupling boss b1 and the first block 100 are fixed with a pin P.

4) The second coupling boss b2 and the second block 200 are fixed with the pin P.

5) After the pins P and the slide grooves of the first block 100 and the second block 200 are fitted to each other, the attachment is completed by fixing them to both shafts. Maintenance work is performed in reverse order.

As described above, the central block (B) and the coupling boss is simple in configuration and composed of the same type, so assembling and maintenance work are very easy.

3 and 7, the completed shaft coupling includes two coupling bosses of two types, each of which has a pair of slide grooves and pins P, and one type of block constituting the central block B. It has a simple structure consisting of two, a coupling boss and two assembly pins (P) of the central block (B), bearings are installed on the inner circumference of the slide groove, and each pin (P) at both ends thereof. It is fixed by the set screw.

In the following, the operation of the shaft coupling of the present invention will be described in more detail.

When the left and right coupling bosses b1 and b2 are attached and fixed to the rotating shaft in a state where there is an error between the connecting shafts, the center of rotation of the left and right coupling bosses is changed. Therefore, the center block B, which is fitted and coupled to the left and right coupling bosses, automatically adjusts the center position by moving the fitting position at the time of rotation in the X-axis direction, Y-axis direction and Z-axis direction (axis longitudinal direction). To rotate the torque. In this way, the present invention, since the free mechanism in the central block (B) to hold the optimum coupling position in the three-dimensional direction in response to the change, it is possible to rotate and smoothly transmit the rotation torque.

As described above, in the present invention, the shaft coupling is configured to have freedom in the three-dimensional direction, so that the shaft position can be adjusted to simultaneously absorb various types of coupling errors with only one shaft coupling, thereby smoothly rotating torque transmission. There is an effect that can be done.

In addition, the shaft coupling of the present invention has a simple configuration consisting of the same type of coupling boss and the same type of block, so that the axis correction work, assembly and maintenance work is easy, at the same time the production cost is low, long life Has the effect.

Claims (12)

The first coupling boss (b1) coupled to one axis (I), the central block (B) coupled to the first coupling boss (b1), and the other axis coupled to the central block (B) In the axial coupling formed by sequentially coupling the second coupling boss (b2) to (II) in the Z direction in the axial longitudinal direction, The central block B may include a first block 100 coupled to the first coupling boss b1 so as to be relatively movable in the X direction, and perpendicular to the X direction to the second coupling boss b2. A second block 200 coupled to be movable relative to the Y direction; The first block (100) and the second block (200) is axial coupling having freedom in the three-dimensional direction, characterized in that coupled to move relative to the Z direction perpendicular to both the X and Y direction. The method of claim 1, The first block 100 is coupled to the first coupling boss b1 to be rotatable about the X direction axis, and the second block 200 is rotatable about the Y direction axis to the second coupling boss ( b2) axial coupling having freedom in the three-dimensional direction characterized in that coupled to. The method of claim 2, The first coupling boss (b1) and the first block 100, the second block 200 and the second coupling boss (b2) are provided on one side of the boss or block and protruding in the moving direction pin ( P) and a plurality of bearings formed along the inner circumference of the block or the boss on the other side corresponding to the boss or the block, and the pins are inserted into the slide grooves, respectively, to be relatively movable. A shaft coupling having freedom in the three-dimensional direction, characterized in that. The method according to any one of claims 1 to 3, The first block 100 and the second block 200 are formed in one of the blocks and extend in the Z-axis direction, the slide groove is provided with a plurality of bearings are installed along the inner circumference, and the other one of the blocks The axial coupling having freedom in the three-dimensional direction characterized in that the protruding in the Z-axis direction is coupled to be relatively movable by the coupling of the pin (P) inserted into the slide groove. The method of claim 4, wherein And said bearing is a spherical bearing. The shaft coupling having freedom in a three-dimensional direction. The method of claim 4, wherein 3. The shaft coupling having freedom in the three-dimensional direction, characterized in that the bearing is a linear slide bearing. The method of claim 4, wherein The first block 100 and the second block 200 are provided with both the slide groove and the pin (P) in the coupling position corresponding to each other, and the relative movement by the combination of the slide groove and the pin (P). A shaft coupling having freedom in the three-dimensional direction characterized in that coupled. The method according to any one of claims 1 to 3, The first block 100 and the second block 200 are provided in one of the blocks, a spline shaft protruding and extending in the Z-axis direction, and a spline nut groove formed in the other one of the blocks and into which the spline shaft is inserted. The axial coupling having freedom in the three-dimensional direction, characterized in that coupled to the relative movement in the Z-axis direction by the combination of. The method of claim 8, The first block 100 and the second block 200 are provided with both the spline shaft and the spline nut groove at the coupling position corresponding to each other, and is coupled relative to each other by the coupling of the spline shaft and the spline nut groove. A shaft coupling having freedom in the three-dimensional direction, characterized in that. The method of claim 7, wherein The axial coupling having freedom in the three-dimensional direction, characterized in that the first block (100) and the second block (200) is the same kind of block. The method of claim 9, The axial coupling having freedom in the three-dimensional direction, characterized in that the first block (100) and the second block (200) is the same kind of block. The method of claim 1, The first coupling boss (b1) and the second coupling boss (b2) are the same type of coupling boss, characterized in that the axial coupling having freedom in the three-dimensional direction.

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