JP4253804B2 - Shaft coupling with an absorption correction mechanism for three-way error between connecting shafts - Google Patents

Description

The present invention relates to a shaft coupling that couples rotating shafts and absorbs and corrects an inter-axis error that inevitably occurs at the time of shaft coupling and rotation.

If the shaft coupling absorbs and corrects the error between the connecting shafts, the shaft connecting operation becomes easy. Consider a commercially available shaft coupling. For example, a fixed shaft joint made by drilling a shaft hole in a round iron bar does not have a mechanism for absorbing and correcting misalignment and angular misalignment between shafts. One universal joint does not have a mechanism for absorbing and correcting misalignment between axes. The elastic joint uses a material constituting the elastic joint, a shape processed like a spring, and the like, and does not have a separate mechanism for absorbing and correcting an error. The Oldham coupling does not have a separate mechanism for absorbing and correcting the amount of expansion and contraction of the inter-axis distance that occurs during rotation. In this way, a single shaft coupling having a mechanism for simultaneously absorbing and correcting three-way errors is not commercially available.

As described above, the rotation in the state where the error between the connecting shafts is not sufficiently absorbed and corrected is an inconstant speed rotation, and the rotation lacks smoothness and has a high possibility of adversely affecting the connecting device. In reality, this may cause fatigue failure of the joint, wear of the bearing, and malfunction or breakage of the connected equipment. At the work site, time is required for centering work to minimize the error between the connecting shafts. In such a case, the joint mounting work is not easy.

By experiment, the electric motor and the rotated side equipment are connected and the state is further considered. The rotation axis center of the electric motor fixed at a predetermined position is always constant, and the position of the rotation center does not change. Similarly, the rotation axis center of the fixed device to be rotated is also constant, and the position of the rotation center does not change. However, there are parallel and angular two-way errors between the two axes as unavoidable errors. This error becomes a resistance that inhibits rotation. Due to this error, a force is generated that causes the joint to expand and contract in the length direction of the shaft during rotation. This becomes a new error and becomes a resistance that inhibits rotation.

The present invention has been made on the basis of these reasons, and each of them independently absorbs and corrects errors between connecting shafts, that is, three-way errors such as eccentricity, declination, and inter-axis distance expansion / contraction error during rotation. It aims at providing a mechanism in a shaft coupling.

The shaft coupling of the present invention that achieves the above object is a fork in which the tip of the arched arm of the Y-shaped U-shaped portion of the Y-shaped yoke hub is bifurcated, and is arched in the longitudinal direction of the fork. Torque pins inserted into the fork's bifurcated cracks, facing each other so that the U-shaped part of the yoke hub that faces the fork crosses each fork through the arched slot that is bordered on The vertical linear ball bearing and the horizontal linear ball bearing, which are embedded in the positions of both ends of the solid connector 7 so as to be perpendicular to each other, are fitted together and straddled within the arched slot of each fork. A torque pin is fixed by a transverse fixing pin that penetrates across, and when the fixing pin moves along the arch in the slot, the torque pin is simultaneously It characterized the structure to follow the movement through the bifurcated cracks.

As an example, in the above-described shaft coupling, instead of the solid connector, a united connector configured by fitting two one-side connectors in the longitudinal direction of the shaft is used. Linear ball bearings are embedded in the straight arm that protrudes from the center, and two straight arms are provided vertically around the outer periphery of the center of the back of the connector on one side, and linear thrust ball bearings are embedded in the straight arm. Two thrust pins are mounted horizontally around the outer edge of the horizontal center of the back part at a position shifted at right angles to the vertical line formed by the straight arm on the back side. The back side of each of the two one-side connectors Two thrust pins of each one-side connector when facing each other at positions shifted at right angles Since the two thrust linear ball bearing is at the mutual position fit, ligated fitting both constituting one united type connector with. The yoke hub torque pins are respectively fitted to the linear ball bearings in the center of the front side of the one-side connector.

In addition, an embodiment in which a plain hub is used instead of a yoke hub, and an embodiment in which the central portion of the solid connector is cut into two, and the cut portion has a spline shaft and nut fitting structure, Further, instead of the linear ball bearing of the solid connector, an embodiment in which a steel ball is embedded in the ball groove, or a solid circular connector with a circular connector whose end shape on both ends of the solid connector is a circular shape is fixed. The embodiment used instead of the connector, and the tip of the arch-shaped arm of the Y-shaped U-shaped portion of the yoke hub constricted in the Y-shape is closed to form the fork by closing the tip of the fork. Except for replacing the bifurcated crack with a torque pin slot, all other configurations are examples in which another yoke hub identical to the yoke hub is used.

As described above, according to the present invention, a single shaft coupling formed by fitting the torque pin of the yoke hub with the solid connector is configured to absorb the three-direction error at the same time and transmit constant speed rotation. It is difficult to break within the specified torque, has a long life, has a small number of components, is easy to assemble, and can be easily centered even in different mounting operations at each site. Further, the movement of the fitting position of each part releases the external force that tries to destroy the joint, prevents the joint itself from being damaged, prevents the wear of the associated bearing, and the malfunction or breakage of the connecting device. Furthermore, it is possible to reduce the space and size of the entire device. Many industrial advantages such as shortening the time required for the mounting work and simplifying the work are brought about by the present invention.

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 5 relate to a first embodiment of the present invention. 1 is a block diagram of a shaft joint divided into two parts, FIG. 2 is a central longitudinal sectional view of a solid connector, FIG. 3 is a development view showing fitting movement of each fitting portion, and FIG. 4 is a development view showing movement of a torque pin. It is.
For convenience, FIG. 5 is a fitted sliding diagram showing the sliding motion of each linear ball bearing of the solid connector separated into two parts. 6 to 8 relate to a second embodiment of the present invention. 6 is a front view of one-side connector constituting the combined connector, FIG. 7 is a right side partial sectional view of FIG. 6, FIG. 8 is a partial sectional view of the combined connector, and FIG. 9 is a shaft coupling according to the second embodiment. FIG. 10 is a partial cross-sectional view of the shaft coupling according to the third embodiment. FIG. 11 is a top view of the ball groove of the solid connector according to the fifth embodiment, and FIG. 12 is a top view of the ball groove of the semicircular solid connector in which both ends on the both ends of the solid connector according to the sixth embodiment are formed into a circular shape. It is. FIG. 13 relates to the seventh embodiment and is a top view of a yoke hub provided with a fork and a torque pin slot with a closed tip.

In order to facilitate understanding of the present invention, the main components of the present invention will be described first.
As the constituent members, two yoke hubs 1 of FIGS. 1, 2, 3, and 4 are used, and one type of solid connector 7 is used. Moreover, the one side connector 13 of FIG.6, FIG.7, FIG.8 and FIG. Furthermore, two plane hubs 21 in FIG. 10 are used.

As shown in FIGS. 1 to 4, a fork 3 having a bifurcated tip end of an arched arm 2 of a Y-shaped U-shaped portion of a Y-shaped yoke hub 1 is formed, and an arched shape is formed in the longitudinal direction of the fork 3. Two arched slots 4, which are rimmed to each other, face each other so that the U-shaped portions of the yoke hub 1 facing each fork 3 face each other, and one side is shifted at a right angle so that the fork 3 has a bifurcated crack. After fitting and connecting the vertical linear ball bearing 8 and the horizontal linear ball bearing 9 which are embedded in the torque pins 5 inserted into the both ends of the solid connector 7 while being shifted at right angles to each other, The torque pin 5 is fixed by a transverse fixing pin 6 that traverses through the three arcuate slots 4, and the fixing pin 6 moves along the arch in the slot 4. When a shaft coupling that is configured to simultaneously torque pin 5 also follows moves through the bifurcated cracks.

As shown in FIG. 5, the solid connector 7 fitted and connected to the torque pin 5 of the yoke hub 1 repeats the vertical sliding motion 10 and the horizontal sliding motion 11 by the linear ball bearings 8 and 9. By moving the fitting position in the two directions, the eccentricity and declination errors between the two axes are absorbed and corrected, and the first resistance that hinders rotation is removed.

As shown in FIG. 4, the torque pin 5 of the yoke hub 1 moves in a bifurcated crack following the transverse fixing pin 6 in order to absorb the force to expand and contract the joint in the longitudinal direction of the shaft. By the follow-up movement of the torque pin 5, the second resistance that hinders the rotation is removed, and a constant velocity rotating shaft coupling is realized. When there is resistance, the error absorption correction amount is minimum, and when there is no resistance, the error correction amount is maximum.

In summary, all three-way errors are corrected and absorbed by the follow-up movement of the torque pin 5 and the fitting position movement of the fixed connector 7 in the vertical and horizontal directions.

6 to 9 relate to the second embodiment,

8 is used instead of the solid connector 7 in FIG. 8, and two single-side connectors 13 shown in FIGS. 6 to 7 are fitted in the longitudinal direction of the shaft.
A straight arm 14 is provided in the center of the front side of the one-side connector 13 so as to protrude at a right angle, and a linear ball bearing 15 is embedded in the straight arm 14. Two straight arms 16 are vertically provided around the outer edge of the center of the back surface of the one-side connector 13 in the vertical direction, and thrust direction linear ball bearings 18 are respectively embedded in the straight arms 16. Two thrust pins 17 are horizontally mounted around the outer peripheral edge of the center of the back portion at a position shifted at right angles to the vertical line formed by the straight arm 16 on the back side. As shown in FIG. 8, when the back sides of the two one-side connectors 13 are opposed to each other at positions shifted at right angles, the two thrust pins 17 of the one-side connectors 13 and the two thrust direction linears Since the ball bearing 18 comes to the fitting position, the two are fitted and connected to form one united connector 12.

The torque pin 5 of the yoke hub 1 is fitted to the linear ball bearing 15 at the center of the front side of the one-side connector 13 to constitute a shaft coupling. The two one-side connectors 13 absorb external force acting in the length direction of the shaft while fitting and expanding in the thrust direction. The three-way error absorption correction amount of the shaft coupling of the second embodiment is the maximum.

FIG. 10 relates to the third embodiment,

Instead of the yoke hub 1, the plain hub 21 as shown in the figure is used. The torque pin 5 of the plain hub 21 is configured to fit to the linear ball bearing 15 at the center of the front side of the one-side connector 13 constituting the combined connector 12.

As for the fourth embodiment,

In this case, the solid connector 7 shown in FIG. 2 is cut into two at the central portion, and the cut portion has a structure of fitting the spline shaft and the nut.

As a fifth embodiment,

Instead of the vertical linear ball bearing 8 and the horizontal linear ball bearing 9 of the solid connector 7, steel balls are embedded in the ball grooves 22 as shown in FIG. In addition, the sixth embodiment is

12, instead of the solid connector 7, as shown in FIG. 12, a non-circular solid connector 24 whose both ends are in a non-circular shape is used, and a steel ball is embedded in the ball groove 23. To do.

The seventh embodiment is

The Y-shaped U-shaped portion of the Y-shaped U-shaped portion of the yoke hub 1 is closed at the front end of the fork 3 and the fork 26 is closed to form a fork 26. The torque pin slot 27 is used. As shown in FIG. 13, all the other structures are the same as the yoke hub 1 except that the tip end is closed and the remaining bifurcated crack becomes the torque pin slot 27.

Although the embodiments and examples of the present invention have been described above, the scope of the present invention is not limited thereto. For fitting parts, sliding bushes made of oil-impregnated alloy, etc., sliding bushes made of synthetic resin, etc., and other slippery materials can be selected. Any of these satisfy the constituent requirements of the present invention. Select appropriately according to the situation.

In the embodiment, the material of the structure is not limited. Steel, non-ferrous metal, synthetic resin, etc. Also, the manufacturing method is forging, casting, casting, lost wax, resin molding, etc. In addition, the shape and size are appropriate, including the use of any material suitable for the structure. It is not limited to the invention, and can be arbitrarily selected and used.

The present invention can be used in the machine industry and other industrial fields that require shaft connection.

It is a shaft coupling block diagram which divided | segmented the shaft coupling regarding 1st embodiment of this invention into two. It is a center longitudinal cross-sectional view of the solid connector of the shaft coupling of FIG. It is an expanded view which shows the fitting movement of each fitting part of the shaft coupling regarding 1st embodiment of this invention. It is an expanded view which shows the motion of the torque pin of the shaft coupling of FIG. For convenience, it is a fitting slip diagram showing a sliding motion for each linear ball bearing of a solid connector separated into two. It is a front view of the single-sided connector which comprises the united connector of the shaft coupling regarding 2nd embodiment of this invention. It is a right view fragmentary sectional view of FIG. It is a fragmentary sectional view of a united connector. It is a fragmentary sectional view of the shaft coupling regarding 2nd embodiment of this invention. It is a fragmentary sectional view of the shaft coupling regarding 3rd embodiment of this invention. It is a top view of the ball groove of the solid connector of the shaft coupling regarding the fifth embodiment of the present invention. It is a top view of the ball groove of the chip | tip circular solid connector which made the both end side terminal shape of the solid connector regarding the 6th embodiment of this invention into the circular shape. FIG. 14 is a top view of a yoke hub that relates to a seventh embodiment of the present invention and that has a fork with a closed tip and a torque pin slot.

Explanation of symbols

1, 25 Yoke hub 2 Arched arm 3, 26 Fork 4 Arched slot 5 Torque pin 6 Transverse fixing pin 7 Solid connector 8 Vertical linear ball bearing 9 Horizontal linear ball bearing 10 Vertical sliding motion 11 Horizontal direction Sliding motion 12 Combined type connector 13 One side connector 14, 16 Straight arm 15 Linear ball bearing 17 Thrust pin 18 Thrust direction linear ball bearing 19 Screw 20 Shaft 21 Plain hub 22, 23 Ball groove 24 Missing circular solid connector 27 Torque pin slot

Claims (7)

A Y-shaped U-shaped portion of the Y-shaped U-shaped portion of the yoke hub 1 has a bifurcated fork 3, and each of the arch-shaped slots 4 that are arched in the longitudinal direction of the fork 3. Two U-shaped portions of the yoke hub 1 provided so as to pass through the fork 3 face each other so that they face each other, one side is shifted at a right angle, and the torque pin 5 inserted into the fork 3 split is fixed to the torque pin 5 The vertical linear ball bearing 8 and the horizontal linear ball bearing 9 which are embedded in the positions of both ends of the connector 7 at right angles to each other are fitted and connected so as to straddle the arched slot 4 of each fork 3. When the torque pin 5 is fixed by the transverse fixing pin 6 passing through the transverse direction and the fixing pin 6 moves along the arch in the slot 4, the torque pin 5 Configuration the shaft coupling so as to follow the movement through the crotch crevices. The shaft coupling according to claim 1, wherein instead of the solid connector 7, a united connector 12 configured by fitting two one-side connectors 13 in the longitudinal direction of the shaft is used. A linear ball bearing 15 is embedded in a straight arm 14 projecting at a right angle at the center, and two straight arms 16 are vertically provided around the outer peripheral edge of the vertical center of the back surface of the one-side connector 13. Thrust direction linear ball bearings 18 are embedded, and two thrust pins 17 are horizontally mounted around the outer peripheral edge of the horizontal center of the back surface at a position shifted perpendicular to the vertical line formed by the straight arm 16 on the back side. The two single-side connectors 13 face each other at a position shifted from each other at right angles. Then, since the two thrust pins 17 of each one-side connector 13 and the two thrust direction linear ball bearings 18 come to the fitting position, they are fitted and connected to form one united connector 12. To do. A shaft coupling formed by fitting the torque pin 5 of the yoke hub 1 to the linear ball bearing 15 at the center of the front side of the one-side connector 13. The shaft coupling according to claim 2, wherein a plain hub 21 is used instead of the yoke hub 1. The shaft coupling according to claim 1, wherein the central portion of the solid connector 7 is cut into two, and the cut portion has a fitting structure of a spline shaft and a nut. The shaft coupling according to claim 1 , wherein a steel ball is embedded in the ball groove 22 instead of the linear ball bearings 8 and 9 of the solid connector 7. The shaft coupling according to claim 5, wherein the solid circular connector 24 is used in place of the solid connector 7. 2. The shaft coupling according to claim 1, wherein a fork 26 is formed by closing the tip of the fork 3 in which the tip of the arched arm 2 of the Y-shaped U-shaped portion of the Y-shaped yoke hub 1 is divided into two branches. A shaft coupling that uses the same yoke hub 25 as that of the yoke hub 1 except for the remaining bifurcated crack is replaced with the torque pin slot 27.

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