JP2000179563A - Shaft tightening device of shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tighten a shaft by uniformly contracting a tapered boss part of a shaft coupling using a tapered cap, and to release the tightening of the shaft by loosening the tapered cap by a shaft tightening release means. SOLUTION: Bolt insertion holes 22 are provided with equal intervals in an end face of a tapered cap 20, division grooves 6 are formed at the positions at which the circumferential surface of a tapered boss part 2 is equally divided into three, a threaded hole 7 and a bolt insertion hole 22 are arranged with equal intervals on three-divided boss part end face 2a and the tapered cap end face 20a, and the tapered cap 20 is covered over the boss part 2 which is divided into three, and tightened by bolts 8, and equally contracted to tighten the shaft. A shaft tightening release means is provided on a flange side to easily loosen the tapered cap and to release the tightening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool, a robot, an OA device, and the like, in which a boss portion of a shaft coupling used for high precision and positioning of a control motor can be uniformly fastened by a taper cap. The present invention relates to a shaft coupling device for a shaft coupling for releasing shaft coupling by loosening the shaft coupling by means of a shaft coupling releasing means.

[0002]

2. Description of the Related Art Conventionally, in this type of shaft coupling device for a shaft coupling, as shown in FIGS. 7 to 9, a tapered boss portion 102 is formed integrally with a flange portion 101, and one side of the tapered boss portion 102 is provided on one side. Only a radial groove 103 is formed, a tightening ring 104 having a tapered inner surface that fits into the boss 102 is provided, a screw hole 105 is provided in the flange 101, and tightening is performed through a through hole 107 of the tightening ring 104. The structure of fastening with the bolt 106 is known.

[0003]

In the conventional shaft coupling, when a tightening ring 104 is fitted to a boss portion 102 and tightened to a screw hole 105 with a tightening bolt 106, a tensile stress is applied to the flange portion 101 by the tightening force, so that the flange portion 101 Because the flatness of the portion is large, and the boss portion 102 is also formed with a radial split groove only on one side, the diameter cannot be reduced uniformly when tightening with the tightening ring. The stress balance on the flange 101 cannot be made uniform, resulting in a biased stress and deformation.
Runout was large, which was a problem as a shaft coupling.

In order to solve the above-mentioned conventional problems, the present invention divides the tapered boss portion into three equal parts, and also provides a bolt insertion hole on the end face of the tapered cap equally, and the boss portion and the tapered cap are provided. It is an object of the present invention to provide a shaft coupling device for a shaft coupling which can reduce the runout of the outer periphery of the flange portion and the side surface by equalizing the diameter of the boss portion at the time of fastening by the tightening means and making the stress balance in the circumferential direction uniform, thereby reducing the runout of the flange portion. .

Also, as another object, a shaft capable of easily and uniformly releasing the shaft by loosening the tapered cap which has been tightened by using the torque of the bolt of the shaft fastening releasing means provided on the flange boss portion in advance. An object of the present invention is to provide a shaft fastening device for a joint.

[0006]

According to a first aspect of the present invention, there is provided a shaft coupling device for fastening a shaft by fastening a taper cap 20 to a tapered boss portion 2 integrally formed on a flange portion 1 by fastening means. The taper cap 20
A bolt insertion hole 22 through which the tightening bolt 7 of the tightening means is inserted is provided in the end face of the taper boss, and the dividing groove 6 is formed at a position obtained by equally dividing the peripheral surface of the tapered boss 2 into the vicinity of the base end of the boss. At the same time, a screw hole 7 is provided at a position corresponding to a bolt insertion hole 22 provided at the tapered cap end surface 20a on the boss end surface 2a divided into three parts, and a bolt 8 is attached to the boss portion 2 obtained by dividing the tapered cap 20 into three. The diameter of the boss portion 2 can be reduced uniformly so that the shaft can be fastened.

According to the configuration of the first aspect of the invention, the split groove 6 is formed at a position where the tapered boss portion 2 provided on the flange portion 1 is divided into three equal parts, the boss portion 2 is divided into three, and the tapered boss portion 2 is formed. The screw holes 7 are provided on the end surface 2a of the taper cap 20 so that the pitch is equal to the pitch of the bolt insertion holes 22 of the taper cap end surface 20a. Each part can be evenly reduced in diameter with respect to the shaft and fastened to the shaft. By dividing the boss 2 into three parts, a uniform diameter reducing force is applied to the divided pieces constituting the triangle when tightening with the taper cap, and each divided piece is uniformly reduced in diameter toward the center, so that the shaft can be uniformly tightened with stress. it can.

According to a second aspect of the present invention, there is provided a shaft coupling release device for a shaft coupling, wherein the taper cap 20 is fastened to the tapered boss portion 2 integrally formed with the flange portion 1 by a fastening means, thereby fastening the shaft. Tip surface 20 of tapered cap 20 that is tightened to the side surface and boss portion 2 by tightening means
c, a gap L wider than the head of the bolt for unfastening exists, and a screw hole 9 for unfastening bolt is provided on the side of the flange portion opposing the tip end surface of the taper cap. It is characterized by being set by screwing a bolt 10 for use.

According to the second invention, the tapered cap 2
Since the bolt 10 for releasing the fastening is set on the side of the flange portion 1 opposing the end face of the flange portion 0, when releasing the fastening of the shaft, the tightening bolt 8 on the head of the tapered cap 20 must be loosened before the flange portion 1 In this case, the bolt 10 for releasing the fastening of the shaft fastening releasing means set in the above is loosened by a tool such as a spanner, and the tip surface 20c of the tapered cap 20 is pushed up by the torque to loosen the tapered cap 20 to release the shaft fastening. Screw holes are provided in the flange at equal intervals,
In addition, since the diameter may be small, it does not affect the stress of the flange portion when the shaft is fastened.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a shaft fastening device of the present invention, FIG. 2 is a cutaway side view of the same part, FIG.
3 is a sectional view taken along line XX of FIG. 3, FIG. 5 is a sectional view taken along line YY of FIG. 2, FIG. 6 is a perspective view showing a flange portion and a taper cap separated, and FIG. FIG. 8 is a longitudinal sectional view of the same, and FIG. 9 is a perspective view showing the flange portion and the fastening ring separately.

A shaft fastening device for a shaft coupling will be described with reference to FIGS. 1 shows a pair of circular metal-made flanges integrally formed with a tapered boss 2 for inserting and fastening a shaft, and a plurality of square leaf springs 3 between both flanges. The bolt 5 is inserted into the washer 4, the leaf spring 3, and the washer 4 through the circular hole 12 on the peripheral surface of one of the flanges via the washer 4.
Is screwed into the screw hole 13 around the other flange portion and tightened and connected.

In FIGS. 3, 5 and 6, the present invention is characterized in that flanges 1 on both sides are used as means for fastening the shaft coupling.
A groove 6 is formed in the tapered boss portion 2 in the axial direction up to the base end of the boss portion 2 at a position where the peripheral surface is divided into three, and an end surface of the tapered cap 20 is formed on the boss portion end surface 2a divided into three. The screw hole 7 is located at a position matching the bolt insertion hole 22 of 20a.
Are equally arranged. In the embodiment, the screw holes 7 are provided at regular intervals by two in each of the three divided pieces of the boss portion 2 in accordance with the insertion holes 22 of the tapered cap. Thus, the taper cap 20 is put on the taper boss portion 2 and the insertion hole 22 of the taper cap is formed.
By tightening the tightening bolt 8 into the screw hole 7 on the end face 2a of the boss portion, the divided pieces divided into three equal parts can be uniformly reduced in diameter toward the center and can be uniformly fastened to the shaft.
The number of the screw holes 7 is not limited to two, but may be one, three, or the like.

In FIGS. 1, 5, and 6, the present invention provides a means for releasing the shaft coupling of the shaft coupling, in which at least the distance L between the side surface of the flange portion 1 and the distal end surface of the tapered cap 20 at the time of the coupling is fixed. Leave an interval at which the release bolt 10 can be set. In the embodiment, the distance L is set to be slightly larger than the thickness of the head 10 a of the bolt 10 and the thickness of the washer 11. Further, on the side surface of the flange portion, a plurality of screw holes 9 for fastening release bolts are provided at positions opposed to the tapered cap 20.
The fastening release bolt 10 is screwed into the screw hole 9 and set. In the embodiment, in order to push up the taper cap 20 without prying, screw holes 9 are provided at equal intervals at four places on the peripheral surface of the flange portion 1 and bolts 10 are screwed therein. Make the hub shorter,
The diameter of the screw hole 9 is made small so as not to affect the diameter reduction of the tapered boss portion, and the screw hole 9 is provided at a position apart from the position of the split groove 6 of the boss portion, so that the effect of stress does not occur. It is preferable to do so. The fastening release bolt 10 is pressed by a torque when loosened with a tool such as a spanner, so that a pressing force for pressing the taper cap is applied. Make it longer than the sum of L. Further, since the fastening release bolt is used only for release, it may be small in diameter, such as a screw, so that inertia does not increase and dynamic balance is not lost. Since the fastening release bolt 10 is not removed from the screw hole,
It is convenient for maintenance without fear of loss. The screw holes 9 are preferably provided at four or three places on the peripheral surface opposed to the tapered cap.

3 to 6, a tapered cap 20 is a cylindrical cap made of metal or the like having an inner diameter having a shaft hole 21 at the center of the front surface, and has a tapered surface 20b fitted on the tapered boss portion 2 on the inner periphery. A plurality of insertion holes 22 are formed on the end face 20a of the cap 20 at positions corresponding to the screw holes of the boss on the outer periphery. In the embodiment, six insertion holes 22 are formed corresponding to the screw holes of the boss. A distal end surface 20c around the opening of the tapered cap 20 is provided with a flange portion 23 on the outer periphery and is widened so that the head 10a of the bolt for releasing the fastening comes into accurate contact.
Both the flange-side tip surface 20c of the taper cap 20 and the head of the bolt 10 can be brought into tight contact as flat surfaces. Since the cap 20 is thin, the cap 2
The inner surface of the 0 end face 20a is thick as an inclined shape,
Correspondingly, the end surface of the boss 2 is also an inclined surface.

According to the structure of the present invention described above, the case of shaft fastening will be described. A fastening release bolt is screwed into a screw hole 9 on the side surface of the flange portion 1 and set in advance, and the boss portion of the flange portion 1 is set. 2, a shaft such as a drive shaft or a driven shaft is inserted into the shaft hole 21 and the inner diameter of the boss portion 2 and tightened into the screw hole 7 in the boss portion end surface 2a through the insertion hole 22 in the end surface of the taper cap 20. The bolt 8 is screwed in, and the boss portion 2 divided into three by pressing the tapered surface 20b of the tapered cap 20 can be uniformly reduced in diameter and fastened to the shaft. In this shaft fastening, a uniform diametrical force is applied to each divided piece on the boss part divided into three parts, so that a uniform internal stress is also applied to the flange part connected thereto, but there is no influence on the deformation of the flange part.

To release the shaft fastening, loosen the tightening bolt 8 of the taper cap 20 and turn the previously set fastening release bolt 10 in a direction to loosen it with a tool such as a spanner so that the distal end surface 20c of the taper cap 20 can be released by torque. By pressing the taper cap 20, the taper cap 20 is separated from the taper boss portion 2 to release the diameter reduction by the boss portion, thereby releasing the shaft fastening. Screw holes 9 for fastening release bolts at the base of the flange
Are provided at equal intervals and the bolts may be small in diameter, so that the stress applied to the flange does not cause deformation. Therefore, if it is used for high precision, positioning, etc. of the control motor in machine tools, robots, OA equipment, etc., when the positional relationship between the shaft and the boss is changed or when the shaft is removed from the boss, the shaft fastening is performed. Separation work can be performed quickly. Inspection and adjustment of the shaft coupling when shifting the phase can be easily performed by the shaft fastening and the shaft fastening release described above.

Although the above embodiment has been described, the present invention is not limited to this embodiment, and various embodiments can be implemented without departing from the gist of the present invention.
In the embodiment, the case where the taper cap is used has been described. However, the present invention is not limited to this structure, and any structure that can be fitted and fastened to the boss portion using a taper such as a tapered annular member may be used. Further, the shaft fastening device is not limited to the above-described one. For example, a bearing arm provided on a cross is connected to a facing surface of both flange portions by a cross joint pin, and a taper pressing member is attached to a boss portion of the flange portion. A shaft coupling, a coupling, or the like may be used in which the two shafts are fitted and fastened by the fastening means in the same manner as described above to transmit between the two shafts.

[0018]

According to the first aspect of the present invention, the tapered boss provided on the flange is divided into three parts, and the end face of the tapered boss has the same pitch as the hole of the bolt insertion hole on the end face of the tapered cap. Since the screw holes are provided as described above, when the taper cap is fastened to the tapered boss by the fastening means, the divided pieces of the boss can be uniformly reduced in diameter with respect to the shaft and fastened to the shaft. By dividing the boss into three parts, a uniform diameter reduction force is applied to the divided pieces constituting the triangle when tightening with the taper cap, and each divided piece is uniformly reduced in diameter toward the center, so that the stress is evenly and firmly applied to the shaft. Can be fastened.
Thus, according to this shaft fastening means, there is no deformation of the taper boss portion, no deformation of the flange portion, no misalignment, etc., and the machine can be easily centered. Therefore, the boss portion of the shaft coupling used for high precision, positioning, and the like of the control motor in the machine tool, robot, OA equipment, and the like can be uniformly fastened by the taper cap.

According to the second aspect of the present invention, since the fastening release bolt is set on the side of the flange portion opposite to the tip end surface of the taper cap, when the shaft fastening is released, the head of the taper cap is tightened. After loosening the bolt, loosen the fastening release bolt set on the flange with a tool such as a wrench, and use the torque to slightly push up the tip surface of the taper cap. Can be canceled. Since the fastening release bolt is used only for release, it may be as small as a screw, so that inertia does not increase and dynamic balance is not lost. Since the fastening release bolt is not removed from the screw hole, there is no risk of loss and it is convenient for maintenance. Therefore, if it is used for high precision, positioning, etc. of the control motor in machine tools, robots, OA equipment, etc., when the positional relationship between the shaft and the boss is changed or when the shaft is removed from the boss, the shaft fastening is performed. It is convenient because the separation operation can be performed quickly. Also, since the shaft can be fastened by adjusting the phase displacement etc. just by loosening the taper cap, the distance between the shaft fastening device and the motor, the machine, etc. can be narrowed, and the shaft length of the shaft fastening device does not increase, Vibration and torsion do not occur without affecting the performance of the machine.

[Brief description of the drawings]

FIG. 1 is a front view showing a shaft fastening device of the present invention.

FIG. 2 is a cutaway side view of the same part.

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a sectional view taken along line XX of FIG. 3;

FIG. 5 is a sectional view taken along line YY in FIG. 2;

FIG. 6 is a perspective view showing a flange portion and a taper cap separately.

FIG. 7 is a front view showing a conventional shaft fastening device.

FIG. 8 is a longitudinal sectional view of the same.

FIG. 9 is a perspective view showing a flange portion and a ring separately.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange part 2 Taper boss part 6 Split groove 7 Screw hole 8 Tightening bolt 9 Screw hole for fastening release bolt 10 Fastening release bolt 20 Taper cap 20c Tip surface 21 Shaft hole 22 Insertion hole

Claims (2)

[Claims] 1. A shaft coupling in which a taper cap is fastened to a taper boss portion integrally formed on a flange portion by a fastening means and a shaft is fastened, wherein a bolt insertion hole for inserting a fastening bolt of the fastening means into an end surface of the taper cap is equally divided. A split groove is formed near the base end of the boss at a position obtained by dividing the peripheral surface of the tapered boss into three, and a bolt insertion hole provided in the end surface of the tapered cap is formed on the end of the boss that is divided into three. A shaft coupling device for a shaft coupling, wherein a screw hole is provided at a matching position, and the taper cap is tightened to a boss portion divided into three parts with a tightening bolt, whereby the boss portion can be uniformly reduced in diameter and the shaft can be tightened. 2. A shaft coupling wherein a taper cap is fastened to a taper boss portion integrally formed on a flange portion by fastening means, and the shaft is fastened to the side surface of the flange portion and a tip end face of the taper cap fastened to the boss portion by fastening means. The screw release bolt is provided on the side of the flange portion opposite to the tip end surface of the taper cap, and the screw is set by screwing the release bolt into the screw hole. A shaft fastening device for a shaft coupling, characterized in that: