JP3834159B2 - Shaft fastening device for shaft coupling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a boss portion of a shaft joint used for high accuracy and positioning of a control motor in machine tools, robots, office automation equipment, etc. can be evenly fastened with a taper cap, and the fastened taper cap is loosened with a shaft fastening release means. The present invention relates to a shaft fastening device for a shaft coupling that releases shaft fastening.
[0002]
[Prior art]
Conventionally, in this type of shaft coupling shaft fastening device, as shown in FIGS. 7 to 9, a tapered boss portion 102 is formed integrally with the flange portion 101, and only one side of the tapered boss portion 102 is split in the radial direction. A structure in which a groove 103 is formed, a tightening ring 104 having a tapered inner surface to be fitted to the boss portion 102 is provided, a screw hole 105 is provided in the flange portion 101, and tightened with a tightening bolt 106 through a through hole 107 of the tightening ring 104. Are known.
[0003]
[Problems to be solved by the invention]
In the conventional shaft joint, when the fastening ring 104 is fitted to the boss portion 102 and the screw bolt 105 is fastened to the screw hole 105, the flange portion 101 is subjected to tensile stress by the tightening force, and the flatness change of the flange portion is large. Moreover, because the boss portion 102 is also formed with a radial groove on only one side, it cannot be uniformly reduced in diameter when tightened with a tightening ring, and strictly speaking, the stress balance in the circumferential direction cannot be made uniform. As a result, a biased stress is generated to cause deformation, and the deflection of the flange portion 101 due to the deformation becomes large, which is a problem as a shaft coupling.
[0004]
In order to solve the above-described conventional problems, the inventor divides the tapered boss into three equal parts, and also provides bolt insertion holes on the end face of the taper cap, and tightens the boss part and the taper cap. An object of the present invention is to provide a shaft fastening device for a shaft coupling that can reduce the runout of the outer periphery and side surfaces of the flange portion by equalizing the diameter reduction of the boss portion at the time of fastening by means and making the stress balance in the circumferential direction uniform.
[0005]
As another object, the shaft coupling shaft can be easily and evenly released by loosening the taper cap fastened using the torque of the bolt of the shaft fastening release means provided in advance in the flange boss. It is to provide a fastening device.
[0006]
[Means for solving the problems]
A shaft fastening device for a shaft joint according to a first aspect of the present invention is a shaft joint for fastening a shaft by fastening a taper cap 20 to a taper boss part 2 formed integrally with the flange part 1 with fastening means, on the end face of the taper cap 20. Bolt insertion holes 22 through which the tightening bolts 7 of the tightening means are inserted are equally divided, and the groove 6 is formed at a position obtained by dividing the peripheral surface of the tapered boss portion 2 into three equal parts and close to the base end of the boss portion. A screw hole 7 is provided on the divided boss end surface 2a at a position that matches the bolt insertion hole 22 provided on the taper cap end surface 20a, and the taper cap 20 is tightened to the boss portion 2 divided into three with a tightening bolt 8. The boss portion 2 can be evenly reduced in diameter and fastened with a shaft.
[0007]
According to the configuration of the first invention described above, the split groove 6 is formed at a position obtained by dividing the tapered boss portion 2 provided in the flange portion 1 into three equal parts, the boss portion 2 is divided into three parts, and the end face 2a of the tapered boss portion 2 is obtained. Since the screw holes 7 are provided so that the pitch of the bolt insertion holes 22 on the taper cap end surface 20a is equal to that of the taper cap end surface 20a. The shaft can be fastened with a uniform diameter reduction. Boss 2 takes thirds evenly shrinkage径力the split piece was divided into three equal during tightening by the tapered cap by the stress uniformly axial fastening since the split pieces are reduced in diameter uniformly toward the center Can do.
[0008]
Jikushime YuiSo location of the shaft coupling of the invention of claim 2 is the shaft coupling to the shaft fastening by tightening with means clamping the flange portion tapered cap 20 to the tapered boss 2 which is integrally formed in one, and the flange portion 1 side There is a gap L wider than the head of the fastening release bolt between the tip end surface 20c of the taper cap 20 that is fastened to the boss portion 2 by fastening means, and the fastening release bolt is on the side of the flange portion facing the tip end surface of the taper cap. A screw hole 9 is provided, and a fastening release bolt 10 is screwed into the screw hole 9 and set.
[0009]
According to the second invention, since the fastening release bolt 10 is set on the side surface of the flange portion 1 that opposes the end face of the taper cap 20, when the shaft fastening is released, the head of the taper cap 20 is tightened. After the bolt 8 is loosened, the fastening release bolt 10 of the shaft fastening release means set on the flange portion 1 is loosened with a tool such as a spanner, and the tip end surface 20c of the taper cap 20 is pushed up by the torque to loosen the taper cap 20. The shaft fastening can be released. Since the screw holes are provided at equal intervals in the flange portion and the diameter may be small, it does not affect the stress of the flange portion when the shaft is fastened.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. 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 thereof, FIG. 4 is a sectional view taken along line XX of FIG. 6 is a perspective view showing the flange portion and the taper cap separately, FIG. 7 is a front view showing a conventional shaft fastening device, FIG. 8 is a longitudinal sectional view, and FIG. 9 is a flange portion. FIG.
[0011]
A shaft fastening device for a shaft coupling will be described with reference to FIGS. A leaf spring type shaft joint is shown. 1 is a pair of circular metal equal flange portions integrally formed with a tapered boss portion 2 for inserting and fastening a shaft, and a plurality of rectangular leaf springs 3 between both flange portions, The bolt 5 is inserted through the washer 12, the leaf spring 3, and the washer 4 from the circular hole 12 on the peripheral surface of one flange portion through the washer 4, and is screwed into the screw hole 13 around the other flange portion and tightened. Connected.
[0012]
3, 5, and 6, the present invention is used as a shaft fastening means of the shaft coupling in the vicinity of the base end of the boss portion 2 at a position obtained by dividing the circumferential surface into the tapered boss portions 2 of the flange portions 1 on both sides. The grooving groove 6 is formed in the axial direction and the boss portion end surface 2a is divided into three equal parts, and the screw holes 7 are equally arranged at positions matching the bolt insertion holes 22 of the end surface 20a of the taper cap 20. Has been. In the embodiment, two screw holes 7 are provided at a predetermined interval on each of the three divided pieces of the boss portion 2 together with the insertion hole 22 of the taper cap. Thus, the taper cap 20 is put on the taper boss portion 2, and the divided bolt divided into three equal parts by tightening the tightening bolt 8 into the screw hole 7 of the end surface 2a of the boss portion through the insertion hole 22 of the taper cap. The diameter can be evenly reduced and the shaft can be fastened evenly. Note that the number of screw holes 7 is not limited to two, and the screw holes 7 can be arranged at equal intervals such as one or three.
[0013]
In FIGS. 1, 5, and 6, the present invention is a shaft fastening release means for the shaft coupling, and the distance L between the side surface of the flange portion 1 and the tip surface of the taper cap 20 at the time of fastening is at least a fastening release bolt. Leave an interval so that 10 can be set. In the embodiment, the distance L is slightly larger than the thickness of the head 10 a of the bolt 10 and the washer 11. Further, a plurality of fastening release bolt screw holes 9 are provided on the side surface of the flange portion at positions facing the taper cap 20, and the fastening release bolts 10 are screwed into the screw holes 9 and set. ing. In the embodiment, in order to push up the taper cap 20 without squeezing it, the screw holes 9 are provided at four positions on the peripheral surface of the flange portion 1 and the bolts 10 are screwed. The length of the hub is shortened and the diameter of the screw hole 9 is made small so that the diameter of the tapered boss portion is not affected. The position where the screw hole 9 is provided is located away from the position of the split groove 6 of the boss portion. It is preferable to provide it so as not to cause the influence of stress. The fastening release bolt 10 is applied with a pressing force that presses the taper cap by torque when loosened with a tool such as a wrench, so that the minimum diameter is sufficient for the pressing, and the length is the distance from the screw hole of the flange portion. Longer than the sum of L. In addition, since the fastening release bolt is exclusively used for release, it can be as small 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, there is no risk of losing and it is convenient for maintenance. In addition, the location where the screw hole 9 is provided is preferably four or three locations on the circumferential surface facing the taper cap.
[0014]
3 to 6, the taper cap 20 is a cylindrical cap made of metal or the like with an inner diameter having a shaft hole 21 in the center of the front surface, and a tapered surface 20b to be fitted to the taper boss portion 2 is formed on the inner periphery. A plurality of insertion holes 22 are formed in the end surface 20a of the cap 20 at positions that match the screw holes of the boss portion on the outer periphery. In the embodiment, six insertion holes 22 are formed corresponding to the screw holes of the boss portion. In addition, the front end surface 20c around the opening of the taper cap 20 is provided with a flange portion 23 on the outer periphery to increase the width thereof so that the head portion 10a of the fastening release bolt can be in proper contact. Both the flange-side tip surface 20c of the taper cap 20 and the head of the bolt 10 can be brought into close contact with each other as a flat surface. Since the cap 20 is thin, the inner surface of the end surface 20a of the cap 20 is inclined and thick, and the end surface of the boss 2 is correspondingly inclined.
[0015]
According to the above-described structure of the present invention, the case of shaft fastening will be described. A fastening release bolt is inserted into the screw hole 9 on the side surface of the flange portion 1 in advance, and the boss portion 2 of the flange portion 1 is tapered. A shaft such as a drive shaft or a driven shaft is inserted into the inner diameter of the shaft hole 21 and the boss portion 2 with the cap 20 covered, and the tightening bolt 8 is inserted into the screw hole 7 of the boss portion end surface 2a through the insertion hole 22 of the end surface of the taper cap 20. The boss portion 2 divided into three parts by screwing and pressing the taper surface 20b of the taper cap 20 can be uniformly reduced in diameter and fastened to the shaft. In this shaft fastening, the boss part divided into three parts is applied with a uniform diameter reducing force on each of the divided parts, so that an equal internal stress is applied to the flange part connected thereto, but there is no influence of deformation on the flange part.
[0016]
When releasing the shaft fastening, the fastening bolt 8 of the taper cap 20 is loosened, the fastening release bolt 10 set in advance is turned in the direction of loosening with a tool such as a spanner, and the tip surface 20c of the taper cap 20 is pushed by the torque to be tapered. The cap 20 can be separated from the tapered boss portion 2 to release the diameter reduction by the boss portion, and the shaft fastening can be released. Although the screw holes 9 for fastening release bolts are provided at the base of the flange portion, they are provided at equal intervals, and the diameter of the bolts may be small, so that deformation is not caused by stress applied to the flange portion.
Therefore, if it is used for high accuracy and positioning of the control motor in machine tools, robots, OA equipment, etc., the shaft fastening is performed when the positional relationship between the shaft and the boss portion is changed or when the shaft is removed from the boss portion. Separation work can be performed promptly.
By the above-described shaft fastening and shaft fastening release, it is possible to easily check and adjust the shaft joint when shifting the phase.
[0017]
Although the above embodiment was shown, this invention is not limited to this form, Various forms can be implemented in the range which does not deviate from the summary of this 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-mentioned one. For example, a bearing arm provided in a cross is coupled to the opposing surfaces of the flange portions on both sides by a cross joint pin, and a taper pressure member is attached to the boss portion of the flange portion. A shaft coupling, a coupling, or the like that engages and fastens with the fastening means in the same manner as described above and transmits between the two shafts may be used.
[0018]
【The invention's effect】
According to this inventions, the tapered boss portion provided in the flange portion divided into three parts, since the end faces of the tapered boss provided screw holes as the hole pitch of the bolt insertion hole of the tapered cap end face is equalized When the taper cap is tightened to the taper boss portion with the tightening means, each of the divided pieces of the boss portion can be evenly reduced in diameter with respect to the shaft and fastened to the shaft. Boss takes three divided evenly shrinkage径力the split piece was divided into three equal during tightening by the tapered cap by a, the stress evenly and firmly respective segments are reduced in diameter uniformly toward the center The shaft can be fastened. Thus, according to this shaft fastening means, there is no deformation of the taper boss portion, deformation of the flange portion, runout, etc., and the centering of the machine can be easily performed. Accordingly, the boss portion of the shaft coupling used for high accuracy and positioning of the control motor in machine tools, robots, OA equipment, etc. can be evenly fastened with the taper cap.
[0019]
According to the present invention, since the fastening release bolt is set on the side surface of the flange portion opposed to the tip surface of the taper cap, when releasing the shaft fastening, after loosening the fastening bolt on the head portion of the taper cap. By simply loosening the fastening release bolt set on the flange with a tool such as a spanner and slightly pushing up the tip of the taper cap with its torque, the taper cap can be easily separated from the boss to release the shaft fastening. it can. Since the fastening release bolt is exclusively used for release, it can be as small as a screw, so 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 losing and it is convenient for maintenance. Therefore, if it is used for high accuracy and positioning of the control motor in machine tools, robots, OA equipment, etc., the shaft fastening is performed when the positional relationship between the shaft and the boss portion is changed or when the shaft is removed from the boss portion. The separation work can be performed quickly and is convenient. In addition, since the shaft can be fastened by adjusting the phase displacement, etc., simply by loosening the taper cap, the distance between the shaft fastening device and the motor, machine, etc. can be narrowed, without increasing the length of the shaft of the shaft fastening device. There is no effect on machine performance, and no vibration or twisting occurs.
[Brief description of the drawings]
FIG. 1 is a front view showing a shaft fastening device of the present invention.
FIG. 2 is a side sectional view of the same part.
FIG. 3 is a longitudinal sectional view of the same.
4 is a cross-sectional view taken along line XX of FIG.
FIG. 5 is a cross-sectional view taken along line YY in FIG.
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 Tapered boss part 6 Split groove 7 Screw hole 8 Tightening bolt 9 Tightening bolt screw hole 10 Fastening release bolt 20 Taper cap 20c Tip surface 21 Shaft hole 22 Insertion hole

Claims (2)

In the shaft joint that tightens the taper cap by tightening the taper cap to the taper boss part formed integrally with the flange part,
Bolt insertion holes for inserting the tightening bolts of the tightening means are equally provided on the end face of the taper cap,
A position where the peripheral surface of the tapered boss part is divided into three equal parts and a split groove is formed close to the proximal end of the boss part, and the boss part end face divided into three parts is a position that matches the bolt insertion hole provided in the end face of the taper cap Screw holes,
A shaft fastening device for a shaft coupling, wherein the taper cap can be fastened with a fastening bolt to a boss portion obtained by dividing the taper cap into three parts and the boss portion can be uniformly reduced in diameter to be fastened. In the shaft joint that fastens the taper cap by fastening means to the taper boss part formed integrally with the flange part with the fastening means,
A fastening clearance bolt is provided on the side of the flange portion that faces the front end surface of the taper cap, with a gap wider than the head of the fastening release bolt between the side surface of the flange portion and the tip end surface of the taper cap that is tightened to the boss portion by tightening means. A shaft fastening device for a shaft coupling, wherein a screw hole is provided and a fastening release bolt is screwed into the screw hole.

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