JPH11294471A - Shaft unfastening device for shaft fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify separation of a taper pressure member and a taper boss part, fastened together by a shaft fastening device by an unfastening bolt preset at a taper pressure member, from each other. SOLUTION: A threaded hole 21 having a recessed containing seat 23 in which a U-shaped 22 is fitted is formed in a taper pressure member. The U-shaped washer 22 is provided to have thickness higher than a distance between an unfastening bolt 25 and a taper boss part 2. The unfastening bolt 25 is prefastened against the containing seat of the taper pressure member and set thereat with the U-shaped seat 22 interposed therebetween. After, during unfastening of a shaft fastening device, a bolt 25 for unfastening fastened against and set at the threaded hole 21 of the taper pressure member is unfastened and the U-shaped washer 22 located at the containing seat is pulled out, the taper pressure member is separated away from the taper boss part 2 by screwing in the unfastening bolt 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft fastening device used for high precision and positioning of a control motor in a machine tool, a robot, an OA device, and the like, and a shaft fastening device for separating a shaft fastening in a shaft fastening device of a shaft coupling. It relates to a release device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7 and FIG. 8, in a shaft coupling shaft fastening device, a flange 101 having a boss 102 for fastening a shaft is connected via a leaf spring 103. There is a type in which a tapered concave hole 104 is provided in a boss portion 102 of a portion 101, a tapered annular member 105 is fitted into the concave hole 104, and is fastened with a tightening bolt 106. After the shaft is fastened by this shaft fastening device, when the positional relationship between the shaft and the boss is changed, or when the shaft is removed from the boss, the shaft fastening of the shaft fastening device is released. A removal screw hole 107 is formed. The removal screw hole 107 is used without attaching a removal bolt. When releasing the shaft fastening of the shaft fastening device, it is known that the bolt is screwed into the screw hole for removal from the outside and the tip of the screwed bolt is applied to the boss to separate the annular member. .

[0003]

As the shaft fastening and removing device of the above-mentioned conventional shaft fastening device, only a screw hole is provided in the annular member, and a bolt is screwed into the screw hole when the shaft fastening is removed. Therefore, a wide space is required between the end face of the annular member and the motor, machine, gear, and the like. When a motor, a machine, or the like is installed close to the annular member 105 side in FIG. 8 and the distance between the end surface of the pressing member and the motor, the machine, the gear, or the like is smaller than the length of the bolt, the motor, the machine, or the like is used. Unless a gear or the like is moved, a bolt cannot be inserted into the screw hole of the pressure member, and it is difficult to loosen or remove the shaft, and change the positional relationship between the shaft and the boss portion, Alternatively, the shaft cannot be removed from the boss, which is a problem. In addition, since a large space is required between the shaft fastening device and the motor, machine, etc., the shaft length of the shaft fastening device must be increased by that much, which may cause deterioration in machine performance, vibration, torsion, etc. Had been a problem.

According to the present invention, in order to solve the above-mentioned conventional problems, the inventor of the present invention has provided a receiving seat in which a unique U-shaped washer can be fitted in a screw hole provided in an end face of a tapered pressing member, and the recess is provided in advance. A U-shaped washer is interposed in the accommodation seat, and a fastening release bolt is screwed and set. When the fastening device is released, the U-shaped washer is pulled out, the fastening release bolt is screwed in, and the taper pressurizing member is screwed. It is an object of the present invention to provide a shaft fastening release device in a shaft fastening device which can be easily separated from a tapered boss portion and can reduce an installation interval between the shaft fastening device and a motor, a machine, or the like.

[0005]

According to a first aspect of the present invention, there is provided a shaft fastening release device in which a taper pressing member 8 is joined to a tapered boss portion 2 to be fastened by a shaft fastening device and fastened by fastening means. The tapered pressure member 8 is provided with a threaded hole 21 having a recessed accommodation seat 23 into which a U-shaped washer 22 can be fitted. The screw hole 21 can be fitted into the accommodation seat 23 and detachable from a fastening release bolt. A U-shaped washer 22 thicker than the space between the tapered boss portion is provided, and a fastening release bolt is tightened and set in advance with the U-shaped washer interposed in the accommodation seat of the tapered pressure member, and when the fastening of the shaft fastening device is released. , The bolt 2 for fastening release set in the screw hole 21 of the taper pressing member 8
The tapered pressure member 8 can be separated from the tapered boss portion 2 by loosening the 5 and removing the U-shaped washer 22 housed in the housing seat, and then screwing in the fastening release bolt 25.

According to the first aspect of the invention, when the tapered pressing member is axially fastened to the boss portion of the flange portion by the fastening means, the U-shaped washer receiving seat of the screw hole on the end face of the tapered pressing member in advance. The U-shape washer is interposed between the bolts for unscrewing and set by tightening the unscrewing bolt. The thickness of the U-shaped washer is set between the unscrewing bolt set in the screw hole of the tapered pressure member and the end face of the tapered boss. Since the shafts are separated from each other at a small interval, when the shaft fastening device is released, the bolt for releasing the connection is loosened and the U-shaped washer is pulled out from the accommodation seat.
The bolt for fastening release can be screwed in the range of the stroke of the thickness of the washer, and the screw is advanced by screwing the bolt into contact with the boss portion. The tapered pressure member can be easily and accurately separated from the tapered boss. 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.
Further, since the distance between the shaft fastening device and the motor, the machine, and the like can be narrowed, the shaft length of the shaft fastening device does not increase, the performance of the machine is not affected, and vibration and twisting do not occur.

According to a second aspect of the present invention, there is provided a screw hole 2 having the U-shaped washer receiving seat recessed in an end face of the tapered boss portion 2 of the first aspect.
The flat surface 13 with which the tip of the bolt 25 for fastening release comes into contact at the position corresponding to 1.

According to the second aspect of the present invention, since the flat surface is formed on the end face of the tapered boss with which the tip of the fastening release bolt abuts, the tip of the bolt is flat when the fastening release bolt is screwed. The taper pressing member can be moved in the direction away from the screw by the screw action of the screw hole, and can be easily separated from the taper boss portion.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a shaft fastening device provided with a shaft fastening release device of the present invention, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a perspective view showing a boss portion, a pressing member, a U-shaped washer, and a bolt separately. FIG. 4 is an enlarged sectional view of a main part when the U-shaped washer of the shaft fastening release device is accommodated and the fastening release bolt is tightened, and FIG.
FIG. 6 is an enlarged cross-sectional view of a main part with a U-shaped washer removed, FIG. 6 is an enlarged cross-sectional view of a main part in which a fastening release bolt is screwed, FIG. 7 is a front view of a conventional shaft fastening device, and FIG. is there.

[0010] A shaft coupling device for a shaft coupling will be described with reference to Figs. In the embodiment, a double leaf spring type shaft coupling is shown, in which a metal spacer 3 having an elliptical shape is placed at the center, and a leaf spring 4 is fixed on both sides thereof with bolts 5, and a tapered boss portion 2 for inserting and fastening the shaft is provided. And a pair of elliptical metal-made flange portions 1 integrally formed with each other are tightened and fixed with tightening bolts 6 and nuts 7 in opposition to the leaf spring 4 at a plurality of places, and a metal-made equal taper portion is attached to the tapered boss portion 2. A pressure member, for example, a taper cap 8 is covered, a tightening bolt 10 is inserted into an insertion hole 9 of the taper cap 8, screwed into a screw hole 11 of the boss portion, and a taper surface of the taper cap 8 is formed on a taper surface 2 a of the boss portion 2. 8a is fitted and tightened to fasten the shaft inserted into the boss. In addition, although the case where the taper cap is used as the taper pressing member has been described, 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. Good. 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.

2 and 3, a tapered boss portion 2 on both sides of the flange portion 1 is provided with a shaft hole 12 for inserting a shaft to the flange portion 1 at the center, and a tapered surface 2a is formed on the outer peripheral surface thereof. A screw hole 11 for screwing the bolt 10 is provided on the end face, and a flat surface 13 with which a bolt 25 for fastening release described below comes into contact is formed. In the embodiment, in order to secure the fastening with the shaft, a diameter reducing groove 14 is formed above and below the tapered boss portion 2 from the outer periphery to the shaft hole in a radial direction, and the inner periphery of the flange portion 1 is formed. A notch groove 15 is formed from the inner end to the inner end. 16 are formed.
Thus, when the tapered surface 8a of the cap 8 is fitted to the tapered surface 2a of the boss portion 2 and tightened, the above-described diameter reducing groove and the like are pinched and a bending stress is applied to the elastic thin portion so that the tip of the boss portion The diameter is reduced from the side to the inner end of the flange part so that it can be properly tightened to the shaft. The configuration of the groove for fastening the shaft of the tapered boss portion is not limited to the above-described one. For example, a configuration in which a radial split groove is provided in the boss portion may be used.

3 to 6, a taper cap 8 of the taper pressure member is a cylindrical cap made of metal or the like having a shaft hole 20 at the center of the front surface. The surface 8a is formed and the cap 8
A plurality of screw holes 21 are formed on both sides of the cap 8 separately from the insertion hole 9 at the end face of the cap, and a U-shaped washer 22 described later does not protrude at the entrance of the screw hole 21 during high-speed rotation. A circular U-shaped washer receiving seat 23 capable of fitting and seating a part of the washer is formed. Reference numeral 22 denotes a circular shape having a diameter capable of being fitted to the accommodation seat 23, and a U-shaped hole formed in the fastening release bolt 25 so as to be detachable from the side, and a thickness larger than the distance L between the fastening release bolt and the tapered boss portion. It is a U-shaped washer (U-shaped hole round washer) made of metal, synthetic resin, or the like having a thickness B. The depth of the U-shaped washer accommodating seat 23 is formed to be smaller than the thickness B of the U-shaped washer 22 and is fitted and seated in the U-shaped washer 22 accommodating seat 23 so that the washer pops out during high-speed rotation. In addition, it is preferable that the U-shaped washer 22 has a depth that allows easy removal when the U-shaped washer 22 is removed. If the depth of the accommodation seat 23 is too deep, the U-shaped washer 22, the washer 24, etc. will enter the inside, and when removing the bolt, the bolt cannot be pulled out without loosening the bolt, and the bolt cannot be pulled out.
It is preferable that the receiving seat is formed relatively shallow, because when the bolt is screwed in after removing the washer, the bolt enters into the head of the bolt and the spanner becomes ineffective. Reference numeral 24 denotes a circular washer and a washer for preventing loosening, and the diameter of the washer can be fitted to the accommodation seat 23. Reference numeral 25 denotes a fastening release bolt that is screwed into the screw hole of the taper pressing member and separates the taper pressing member from the taper boss.

Since the cap 8 has a small thickness, the screw hole 2
In order to increase the number of effective screw portions 1 in the embodiment, the inner surface of the end face of the cap 8 is inclined and thick, and the end face of the boss portion 2 is correspondingly inclined as well. A flat surface 13 is formed on the inclined end surface so as to be in contact with the distal end surface of the fastening release bolt 25. In the embodiment, a circular flat surface 13 is provided on the end surface of the boss portion 2.
Is formed, but is not limited to this.
The flat surface may be provided in a notch shape from the end.

As shown in FIGS. 3 and 4, the U-shaped washer receiving seat 23 of the cap 8 is
Is set, the thick U-shaped washer 2
The bolt 2 is tightened with a washer 24 interposed therebetween, and the bolt is set so as not to be loosened during high-speed rotation. The length of the tightening / unfastening bolt 25 is substantially the same as the total thickness of the accommodation seat portion of the cap 8, the U-shaped washer 23, and the washer 24 so that the bolt end does not protrude from the inner surface of the cap 8. When the cap 8 is fitted to the boss portion 2 and fastened with the tightening bolt 10, an interval L smaller than the thickness B of the U-shaped washer 22 is provided between the tip of the fastening release bolt 25 and the end surface of the boss portion 2. It is open. When the shaft is released, the U-shaped washer 22
Can be screwed together with the washer 24 in a range of a stroke corresponding to the thickness B of the U-shaped washer 22.

According to the structure of the present invention described above, the U-shaped washer 22 is fitted and seated on the U-shaped washer accommodating seat 23 of the cap 8 in advance, the washer 24 is placed thereon, and the fastening release bolt 25
The cap 8 is fitted into the boss portion 2 of the flange portion 1, the tightening bolt 10 is screwed into the screw hole 11 through the insertion hole 9, and the boss portion 2 is acted on by the tapered surface of the cap 8. The diameter is reduced uniformly and the shaft is fastened. When the positional relationship between the shaft and the boss portion is changed by the shaft fastening device thus fastened, or when the shaft is released from being released from the boss portion, the fastening release bolt 25 is used. The U-shaped washer 22 is extracted from the accommodation seat 23 by loosening and leaving a space between the bolt head and the cap 8 for extracting the U-shaped washer 22. The bolt 25 can be screwed. The bolt 25 for fastening is advanced within the range of the allowable stroke, and the tip of the bolt 25 is brought into contact with the flat surface 13 of the boss portion 2. By the action, the cap 8 is moved in a direction away from the boss portion, and the boss portion and the cap can be separated. 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.

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.

[0017]

According to the invention, the U-shaped washer receiving seat of the threaded hole on the end face of the tapered pressing member is previously tightened and set by the fastening release bolt with the U-time washer interposed therebetween. When the shaft is fastened to the boss of the part by fastening means,
Since the clearance between the fastening release bolt tightened and set in the screw hole of the taper pressing member and the end face of the tapered boss portion is smaller than the thickness of the U-shaped washer, the fastening is released when the shaft fastening device is released. By unscrewing the bolt and pulling out the U-shaped washer from the receiving seat, the fastening release bolt can be screwed in within the allowable range of the stroke corresponding to the thickness of the U-shaped washer. The taper pressing member can be easily and accurately separated from the tapered boss by the screw action by contacting and turning the bolt after the contact. 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. Further, since the distance between the shaft fastening device and the motor, the machine, and the like can be narrowed, the shaft length of the shaft fastening device does not increase, the performance of the machine is not affected, and vibration and twisting do not occur.

Further, since a flat surface is formed on the end surface of the tapered boss with which the tip of the fastening release bolt abuts, when screwing the fastening release bolt, the tip of the bolt abuts on the flat surface and turns further. Thus, the tapered pressure member can be moved in the direction away from the screw by the screw action of the screw hole, and can be easily separated from the tapered boss portion.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a perspective view showing a boss, a pressing member, a U-shaped washer, and a bolt separately.

FIG. 4 is an enlarged sectional view of a main part when the U-shaped washer of the shaft release device is accommodated and the release bolt is tightened.

FIG. 5 is an enlarged sectional view of a main part of the same with a U-shaped washer removed.

FIG. 6 is an enlarged sectional view of a main part in a state where a fastening release bolt is screwed.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange part 2 Taper boss part 8 Taper cap 13 Flat surface 21 Screw hole 22 U-shaped washer 23 U-shaped washer accommodation seat 24 Washer 25 Fastening release bolt

Claims (2)

[Claims] 1. A shaft fastening device in which a tapered pressure member is joined to a tapered boss portion to be fastened to a shaft and fastened by fastening means, wherein a receiving seat capable of fitting and seating a U-shaped washer is recessed in the tapered pressure member. A U-shaped washer provided with a screw hole, which can be fitted to the accommodation seat and can be attached to and detached from a fastening release bolt, and which is thicker than a gap between the bolt and the tapered boss portion is provided. A U-shaped washer is tightened and set in the threaded hole of the taper pressurizing member when the fastening of the shaft fastening device is released. A shaft fastening release device in a shaft fastening device, wherein a taper pressurizing member can be separated from a taper boss portion by screwing a fastening release bolt after removing a washer. 2. A flat surface on which an end of a fastening release bolt abuts at a position corresponding to a screw hole in which the U-shaped washer receiving seat is recessed, is formed on an end surface of the tapered boss portion. A shaft fastening release device in a shaft fastening device.