TWI513921B - Shaft coupler - Google Patents

Description

Shaft coupling

The present invention relates to a shaft coupling for coupling a shaft to a shaft.

A shaft coupling is used to extend the shaft or to transmit power from the other axis of one of the shafts. Various shaft couplings have previously been proposed.

As an example thereof, there are those disclosed in Patent Documents 1 and 2.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2005-273790

[Patent Document 2] Japanese Patent No. 3382585

Patent Document 1 discloses a flexible crank coupling in which a radial cross section of a bottom portion of a slit in a direction perpendicular to a direction in which a shaft hole intersects an axis is substantially linear in a peripheral surface of the shaft fixing portion, and has a substantially linear shape. The outer peripheral side is retracted into an arcuate convex end surface. According to the invention of Patent Document 1, since the convex end surface of the above-described shape is provided in view of the maximum stress applied to the outer peripheral side of the shaft fixing portion, it is possible to prevent cracking of the shaft coupling due to stress concentration on the outer peripheral side or damage.

According to the invention of Patent Document 2, the radial cross section of the bottom of the slit is an arc shape. Thereby, even if the cutting amount of the slit to the shaft fixing portion is shallow, the fastening strength of the shaft can be maintained, and the manufacturing is easy.

Fig. 5 (a) is a view showing a radial cross section of the shaft fixing portion 40 of the flexible crank coupling of Patent Document 1.

As shown in FIG. 5(a), in the invention of Patent Document 1, the cross section of the slit bottom portion 41 in the radial direction is substantially linear.

In the case where the cross section of the slit bottom portion 41 in the radial direction is linear, the cross-sectional area of the remaining portion 42 is reduced, so that the strength of the shaft fixing portion is weak, and the transmission torque and the torsional rigidity are lowered. Further, in the invention of Patent Document 1, since the outer peripheral side of the slit bottom portion 41 is retracted into an arc shape, the area of the remaining portion 42 is accordingly reduced.

Fig. 6 is a view showing a manufacturing step of the straight-angled slit 41' in which the bottom portion is linear.

First, the metal saw 60 is lowered at the outer peripheral end 44a of the shaft fixing portion 40', and the metal saw 60 is moved to the axial center (see Figs. 6(a) and (b)).

Thereafter, as shown in Fig. 6(c), the metal saw 60 is moved to the other outer peripheral end 44b of the shaft fixing portion 40', and in this state, the metal saw 60 is moved upward to complete the manufacture.

Therefore, there is also a problem that since the moving distance of the metal saw 60 is equivalent to the outer diameter of the shaft fixing portion 40', it takes time to manufacture. As is clear, when the outer peripheral ends 44a and 44b are retracted into an arc shape as in Patent Document 1, more time is required for manufacturing.

Then, FIG. 5(b) is a view showing a radial cross section of the shaft fixing portion 50 of the shaft coupling of Patent Document 2.

As described above, in the invention of Patent Document 2, the radial cross section of the slit bottom portion 51 in the direction perpendicular to the axis is an arc shape.

When the slit bottom 51 is an arc shape, the area of the remaining portion 52 is larger than that of the case where the bottom portion of the slit in the right-angle direction has the same cutting depth. The reason for this is that, in either case, the extension of the center direction of the bottom of the slit is designed to pass through the axis. Further, in the production, the metal saw is moved to the axial center, and is moved upward in this state and then retracted, thereby being easy to manufacture and time-consuming.

However, the length L' from the center of the jig screw 54 to the end portion 56 of the slit bottom 51 is shorter than the case where the bottom of the slit is linear. Therefore, compared with the shaft coupling in which the bottom of the slit is linear, there is a problem that the clamp portion is hard to be bent and the fastening force of the shaft is weak.

Therefore, in view of the above problems of the prior art, an object of the present invention is to provide an axis which improves the strength of the shaft fixing portion by securing the cross-sectional area of the remaining portion, and has a strong fastening force of the shaft and is not time-consuming in manufacturing. Coupling.

The present invention solves the above problems by a shaft coupling having a shaft hole portion for fixing a shaft and a longitudinal slit disposed in parallel with the shaft hole portion, and having the longitudinal slit fixed thereto The jig for the jig in the direction in which the shaft is formed at a right angle is deformed by the screw and fastened to the shaft fixing portion of the shaft, and the horizontal slit in which the longitudinal slit is deformed is provided in the shaft fixing portion. a direction perpendicular to the axis; a remaining portion of the lateral slit is formed to be unequally formed by the longitudinal slit; and a radial cross section of the bottom of the lateral slit is adjacent to the longitudinal slit with the axis as a boundary It is arc-shaped, and it is linear away from it.

According to the invention, the cross section in the radial direction of the bottom of the lateral slit is a combination of an arc shape and a straight line shape. This has the following effects.

1. The cross-sectional area of the remaining portion is larger than that of the bottom portion of the horizontal slit, and the strength of the shaft fixing portion is increased, so that the transmission torque and the torsional rigidity are increased, and it is easy. Manufacturing.

2. The clamp portion is more easily deflected than the bottom portion of the horizontal slit in the radial direction, so that the fastening force of the shaft can be improved.

Hereinafter, embodiments of the present invention will be described with reference to Figs. 1 to 4 . However, the present invention is not limited to the embodiment.

In FIG. 1, the shaft coupling 1 is formed by fixing a pair of shaft fixing portions 20 and 30 by a coupling means 10. Further, a leaf spring 12 is provided between the shaft fixing portion 20 and the shaft fixing portion 30.

Further, the shape of the shaft fixing portions 20, 30 is preferably a cylindrical shape.

Shaft hole portions 22, 32 for inserting the shaft are provided in the shaft fixing portions 20, 30, respectively. The shafts inserted into the shaft hole portions 22 and 32 are fastened to the shaft fixing portions 20 and 30 by fastening the jig screws 14 respectively.

In the shaft fixing portions 20 and 30, the outer circumferential wall portions 20b and 30b of the shaft fixing portions 20 and 30 are provided with lateral slits 24 and 34 at right angles to the shaft fixing portions 20 and 30. When the lateral slits 24 and 34 are provided, the remaining peripheral portions 20a and 30c that do not penetrate the other of the opposite sides of the shaft fixing portions 20 and 30 remain as the remaining portions 20a and 30a of the slit remaining portion. The bottom of the horizontal slit (hereinafter sometimes referred to as "slit bottom") 25, 35 is formed.

As shown in FIG. 2(a), the vertical slit 28 is provided in parallel with the shaft hole portion 22 so as to pass through the shaft hole portion 22 and further cut into the remaining portion 20a. The jig 14 for the jig is fastened, and the longitudinal slit 28 is deformed so as to be narrowed in width, and the shaft (not shown) is fastened to the shaft hole portion 22 by the surface pressure.

The remaining portion 20a is divided into unequal divisions with the longitudinal slits 28 as boundaries.

The radial cross section of the slit bottom portion 25 is formed such that the axis (25a) which is close to the vertical slit 28 is formed in an arc shape with the axis as a boundary, and is formed linearly away from the person (25b).

By making the cross section of the slit bottom portion 25a in the radial direction, as shown in Fig. 3(a), the area of the remaining portion 20a is increased by 20a' as compared with the case of being linear (25a'). . Therefore, the strength of the shaft fixing portion is increased as compared with the axial coupling in which the entire bottom portion 25 of the slit is linear, and the transmission torque and the torsional rigidity are also increased.

In addition, when the slit bottom portion 25b is linear, the length L1 from the center of the jig screw 14 to the end portion of the slit bottom portion 25b is longer than the length L2 in the case of the arc shape (25b') ( Refer to Figure 3(b)). The longer the length from the center of the jig screw 14 to the end of the slit bottom portion 25b, the more easily the jig portion is bent, and the fastening force of the shaft is improved.

It is assumed that, in the shaft coupling in which the slit bottom portion 25 is entirely circular, the length from the center of the jig screw 14 to the end of the slit bottom is secured to L1, as shown in Fig. 3(c). The arcuate slit bottom 25' must be located deeper into the slit bottom 25 of the present invention. Therefore, since the area of the remaining portion 20a is reduced by 20a", the strength of the shaft fixing portion is weakened, and the transmission torque and the torsional rigidity are also lowered.

As described above, one of the shaft fixing portions 20 has been described, and the other shaft fixing portion 30 is also the same.

According to the above configuration, one of the shafts is fixed to the shaft hole portion 22 of the shaft fixing portion 20, and the other shaft is fixed to the shaft hole portion 32 of the shaft fixing portion 30. Further, the shaft fixing portion 20 and the shaft fixing portion 30 are coupled by the connecting means 10. Thereby, the shaft coupling 1 can transmit the rotation of two axes having different heights (eccentricities) or different inclinations (offsets).

Next, a manufacturing procedure of the lateral slit of the shaft coupling of the present invention will be described with reference to Fig. 4 .

First, the metal saw 16 is moved to the axis (see FIGS. 4(a) and 4(b)). Then, the metal saw 16 is moved in the lateral direction (the direction of the arrow in FIG. 4(b)), and the metal saw 16 is moved backward (see FIG. 4(c)). Thereby, the transverse slit is completed. In this step, the lateral movement of the metal saw 16 is from the axial center to the end of the slit bottom portion 25b, and corresponds to one half of the outer diameter of the shaft fixing portion 20.

As described above, in the shaft coupling in which the entire bottom portion of the slit is linear, the moving distance of the metal saw corresponds to the outer diameter of the shaft fixing portion, so that the lateral slit of the present invention is less time consuming in manufacturing.

As described above, according to the present invention, it is possible to provide a shaft coupling which eliminates the bottom portion of the slit into a linear shape by combining the radial cross section of the slit bottom portion with a circular arc shape and a linear shape. The shaft coupling and the bottom of the slit only form the arc-shaped shaft coupling, which has the disadvantages of both.

That is, the shaft coupling at the bottom of the slit is only a circular shaft coupling, and the shaft fixing portion is stronger than the shaft coupling portion, and the transmission torque and the torsional rigidity are higher. Moreover, it is easy to manufacture. On the other hand, since the clamp portion is difficult to flex, the fastening force of the shaft is weak.

In the invention of the present invention, one of the sections in the radial direction of the slit is formed in an arc shape, so that the shaft fixing portion has stronger strength, and the transmission torque and the torsional rigidity are stronger than that of the shaft coupling in which the bottom of the slit is only linear. High, and the manufacturing time is also shorter. Further, since one of the bottom portions of the slit is linear, the clamp portion is more easily bent than the shaft coupling at the bottom of the slit, and as a result, the fastening force of the shaft is increased.

1. . . Shaft coupling

10. . . Link means

12. . . Leaf spring

14, 54. . . Fixture screw

16, 60. . . Metal saw

20, 30, 40, 40', 50. . . Shaft fixing

20a, 30a, 42, 52. . . Remaining part

20a’. . . Increase part

20a"...reduced part

20b, 20c, 30b, 30c. . . Peripheral wall

22, 32. . . Shaft hole

24, 34. . . Transverse slit

25, 25', 25a, 25a', 25b, 25b', 35, 41, 51. . . Bottom of the horizontal slit

28. . . Longitudinal slit

41’. . . Axis right angle slit

44a, 44b. . . Peripheral end

56. . . Ends

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front elevational view of a shaft coupling of the present invention.

Fig. 2 is a view showing a shaft fixing portion of one of the shaft couplings of the present invention, wherein (a) is a cross-sectional view in the radial direction, and (b) is a view showing the shaft fixing portion in the radial direction.

Fig. 3 (a) is a view showing a difference in sectional area of a remaining portion of a shaft coupling in which a shaft coupling of the present invention is linear in a radial direction, and (b) is a shaft coupling of the present invention. (c) shows the difference between the length of the shaft coupling of the arc and the axial direction of the shaft of the horizontal slit to the clamp portion, and (c) shows the shaft coupling of the present invention and the horizontal The cross-sectional area of the remaining portion when the length of the arc-shaped axial coupling of the bottom of the slit is the same from the center of the jig for the jig to the clamp portion.

Fig. 4 is a view showing a manufacturing step of a lateral slit of the shaft coupling of the present invention.

Fig. 5(a) is a cross-sectional view of the axial direction of the axial joint in the radial direction of the bottom of the transverse slit, and (b) the diameter of the axial coupling in which the radial cross section of the transverse slit is circular. A cross-sectional view of the direction.

6(a) to 6(c) are views showing a manufacturing procedure of a lateral slit of a shaft coupling in which a cross section in the radial direction of the bottom of the lateral slit is linear.

14. . . Fixture screw

20. . . Shaft fixing

20a. . . Remaining part

20b, 20c. . . Peripheral wall

twenty two. . . Shaft hole

twenty four. . . Transverse slit

25, 25a, 25b. . . Bottom of the horizontal slit

28. . . Longitudinal slit

Claims (1)

A shaft coupling having a shaft hole portion for fixing a shaft and a longitudinal slit disposed in parallel with the shaft hole portion, and having a clamp for fastening the vertical slit at a right angle to the shaft The screw is deformed by the screw to be fastened to the shaft fixing portion of the shaft, and the horizontal slit in which the vertical slit is deformed is provided in a direction perpendicular to the axis of the shaft fixing portion; The remaining portion is formed in an unequal manner with the longitudinal slit as a boundary; in the radial cross section of the bottom of the lateral slit, the axial center is the boundary, and the longitudinal slit is an arc, and the distance is Straight.