JP6741311B2 - Shaft coupling - Google Patents

Description

The present invention relates to a shaft coupling that connects two rotating shafts.

As shown in FIG. 7, the shaft joint 100 of this type includes a pair of joint members 131 and 132, and the shaft portions 21 and 22 are attached to the shaft holes 133 and 137 at the central portions of the joint members 131 and 132, respectively. To connect the two shaft portions 21 and 22. For example, the shaft coupling 100 is used for connecting the rotary drive shaft (the one shaft portion 21) and the rotary driven shaft (the other shaft portion 22) supported by the bearing 5. In this case, the other shaft portion 22 supported by the bearing 5 is attached with a nut 56 for preventing the shaft 5 from coming off from the bearing 5, so that the other shaft portion 22 has a portion protruding from the nut 56 for preventing the shaft from coming off. The joint member 132 is fixed.

JP, 2007-232137, A

As described above, in the conventional shaft coupling 100, since it is necessary to dispose the retaining nut 56 adjacent to the bearing 5, the shaft coupling 100 is disposed apart from the bearing 5, so that The distance between the connecting portions of the two shaft portions 21 and 22 was long. Therefore, in the recent progress in space saving of various devices, the conventional shaft coupling 100 cannot meet the user's space saving request in the fixed connection structure of the two shaft portions 21 and 22.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shaft coupling that can save space between a bearing and a connecting portion of two shaft portions.

The shaft coupling according to the present invention is
A shaft joint comprising a pair of joint members, each of which has a shaft hole for mounting two rotating shaft parts at its center,
One joint member constitutes a shaft clamp portion that fits one shaft portion into a shaft hole,
The other joint member is provided with a female screw portion in the shaft hole, is arranged adjacent to a bearing supporting the other shaft portion, and the female screw portion is provided in a male screw portion provided on the outer peripheral surface of the other shaft portion. Configure the nut part to be screwed,
The shaft hole of the other joint member is provided with a straight smooth curved surface portion along with the female screw portion,
The shaft hole of the smooth curved surface portion is set to an inner diameter that is brought into contact with the smooth outer peripheral surface of the other shaft portion ,
On the other joint member, a large diameter portion and a small diameter portion are integrally formed in the axial direction,
The small-diameter portion is arranged on the outer end face side facing the bearing, and is configured to be able to enter the concave portion around the shaft hole in the end face of the bearing and to abut on the end face of the inner ring fitted externally to the shaft portion in the bearing. And a collar member for preventing movement of the bearing in the axial direction .

According to the above configuration, the other joint member is provided with the female screw portion in the shaft hole and constitutes the nut portion that is screwed into the male screw portion of the other shaft portion. Can also function as a stop nut. Therefore, the retaining nut is unnecessary, the shaft coupling can be brought close to the bearing, and the space for the connecting portion of the two shaft portions can be saved. Further, since the retaining nut is not required, the number of parts can be reduced and the cost can be reduced.
When the female screw portion of the other joint member is screwed into the male screw portion of the other shaft portion, the smooth curved surface portion of the other joint member is brought into contact with the smooth outer peripheral surface of the other shaft portion, so that the other The other joint member is fixed so as to be concentric with the shaft portion of.
In addition, by integrally forming the male threaded portion and the smooth curved surface portion in the other joint member, the axial length of the male threaded portion can be made smaller than that of the conventional one that requires a separate retaining nut. It can be shorter than the retaining nut. Therefore, it is possible to further reduce the space of the connecting portion of the two shaft portions.
Further, since the small-diameter portion constitutes a part of the other joint member, by disposing the small-diameter portion in the concave portion of the bearing end face with the function of the collar member for preventing movement of the bearing in the axial direction. Further, the shaft coupling can be moved to the bearing side to save space in the connecting portion of the two shaft portions.
By the way, when the other shaft portion fixed to the other joint member is a ball screw or the like, a load in the thrust direction may be applied to the shaft joint. In this case, the shaft portion is reduced due to the diameter reduction of the shaft hole as in the conventional shaft joint. In the case where the shaft is fitted, there is a risk that the torque transmission between the two shafts will be lost due to the lack of the torque transmitted by the shaft coupling due to the two loads, the rotational torque and the load in the thrust direction. It was
On the other hand, according to the shaft coupling of the present invention, since the other joint member and the other shaft portion are fixed by screwing the respective screw portions, the shaft coupling in the thrust direction from the other shaft portion with respect to the shaft coupling. Even when a load is applied, the rotation transmission force of the shaft coupling is sufficiently secured, and the torque transmission performance between the two shaft portions can be sufficiently exhibited.

In the above shaft coupling,
It is desirable that the tightening torque when screwing the female screw portion of the other joint member into the male screw portion of the other shaft portion is set to be larger than the rotation torque of the one shaft portion of the one joint member.
According to this, it is possible to prevent the loosening of the screw between the screw portions of the other joint member and the other shaft portion due to the rotation of the one shaft portion, and it is possible to obtain sufficient torque transmission performance between the two shaft portions. Can be demonstrated.

In the above shaft coupling,
The pair of joint members may be separately configured and connected to each other via an intermediate mechanism portion that absorbs the axial misalignment between the two shaft portions fixed to each joint member.
According to this, even if there is axial misalignment such as axial displacement or angular error between the two shafts fixed to the pair of joint members, this axial misalignment is absorbed by the intermediate mechanism section. Therefore, the two shaft portions can be connected without applying a large load to each shaft supporting portion.

According to the shaft joint of the present invention, since the other joint member constitutes the nut portion for screwing the other shaft portion, the retaining nut for the other shaft portion supported by the bearing is not required, and the shaft joint is Space can be saved in the connecting portion of the two shafts by approaching the bearing. Therefore, it is possible to meet the demand for space saving in the device provided with the connecting portion of the two shaft portions by the shaft coupling.

It is a partial cross-sectional front view which shows the usage example of the shaft coupling of Embodiment 1. It is a figure which shows the shaft coupling of Embodiment 1, the figure (a) is a front view, the figure (b) is sectional drawing of one joint member, the figure (c) is sectional drawing of the other joint member, Figure (d) is a plan view. It is a partial cross section front view which shows the usage example of the shaft coupling of Embodiment 2. It is a partial cross section front view which shows the usage example of the shaft coupling of Embodiment 3. It is a figure which shows the shaft coupling of Embodiment 3, the figure (a) is a front view, the figure (b) is a side view of one joint member, the figure (c) is a side view of the other joint member, Drawing (d) is a side view showing the modification of the other joint member. It is a front view showing various examples of an intermediate mechanism part which connects a pair of joint members. It is a partial cross section front view which shows the usage example of the conventional shaft coupling.

(Embodiment 1)
As shown in FIGS. 1 and 2, the shaft coupling 1 of the first embodiment is used to connect two rotating shaft parts 21 and 22, and is a pair of joint members for fixing the shaft parts 21 and 22 respectively. 31 and 32 are provided. The shaft coupling 1 transmits the rotational force of one shaft portion 21 to the other shaft portion 22. As the two shaft portions 21 and 22, for example, one shaft portion 21 is a rotary drive shaft such as a motor shaft of the drive motor 4, and the other shaft portion 22 is a rotary driven shaft used for various operations such as a ball screw. Is. The rotary driven shaft is supported by the bearing 5 near the end. The bearing 5 has an inner ring 51 that is fitted onto the shaft portion 22, an outer ring 52 that is disposed on the outer periphery of the inner ring 51, and a bearing 53 that is interposed between the inner ring 51 and the outer ring 52. The part 22 is rotatably supported. Further, a recess 54 is provided around the shaft hole on the end surface of the bearing 5 on the side where the end of the shaft portion 22 projects in the bearing 5, and a collar member 55 is disposed in this recess 54. The collar member 55 prevents the shaft joint 1 rotating together with the shaft portion 22 from coming into contact with the end surface of the bearing 5.

The pair of joint members 31 and 32 of the shaft joint 1 can be formed of, for example, a metal such as iron, stainless steel, and aluminum, and are formed into a cylindrical shape as a whole, and the shaft portions 21 and 22 are attached to the central portions thereof. Axial holes 33 and 37 are provided. In addition, the pair of joint members 31 and 32 are integrally formed with each other on their opposing end face sides in a peripheral wall portion surrounded by a small arc slightly smaller than a semicircle.

One joint member 31 is fixed to one shaft portion 21 which is a rotary drive shaft, and constitutes a shaft clamp portion which fits and fixes the one shaft portion 21 into the shaft hole 33. The shaft hole 33 of the one joint member 31 is formed to have a size corresponding to the shaft diameter of the one shaft portion 21. The peripheral wall around the shaft hole 33 is provided with a slit 34 cut in the axial direction from the shaft hole 33 to the outer peripheral surface, and a bolt mounting hole 36 for mounting a tightening bolt 35 is provided orthogonal to the slit 34. There is.
The formation position of the slit 34 is set to an intermediate position of the large arc-shaped peripheral wall portion which is not joined to the other joint member 32. Then, when the tightening bolt 35 mounted in the bolt mounting hole 36 is tightened, the gap between the slits 34 is narrowed, the shaft hole 33 is reduced in diameter, and the shaft portion 21 inserted into the shaft hole 33 is fitted and fixed.

The other joint member 32 is fixed to the other shaft portion 22 that is a rotation driven shaft, and constitutes a nut portion that screws and fixes the other shaft portion 22 into the shaft hole 37. The other shaft portion 22 is provided with a male screw portion 23 on the outer peripheral surface of the shaft end portion protruding from the bearing 5 supporting the shaft portion 22. The shaft hole 37 of the other joint member 32 is provided with a female screw portion 61 that is screwed into the male screw portion 23 of the other shaft portion 22. The peripheral wall around the shaft hole 37 is provided with a screw hole 38 penetrating from the shaft hole 37 to the outer peripheral surface in a direction orthogonal to the axial direction. The screw hole 38 has an outer peripheral surface of the shaft portion 22 attached to the shaft hole 37. A holding bolt 39 for holding down is attached. The holding bolt 39 is attached to the screw hole 38 subsequent to the set piece 39a that is brought into contact with the outer peripheral surface of the shaft portion 22. The tool insertion port side (inlet side of the screw hole 38) of the holding bolt 39 is provided in the same direction as the tool insertion port side (inlet side of the bolt mounting hole 36) of the tightening bolt 35 of the one joint member 31. There is. Accordingly, the tightening work of the tightening bolt 35 and the pressing bolt 39 can be performed from the same side, so that the work of attaching the shaft coupling 1 to the two shaft portions 21 and 22 can be efficiently performed.

Then, the other joint member 32 is arranged adjacent to the bearing 5 supporting the other shaft portion 22, so that the male screw portion 23 of the shaft portion 22 supported by the bearing 5 has the female screw of the shaft hole 37. When the portion 61 is screwed in and tightened to a predetermined tightening torque to complete screwing, and then the holding bolt 39 is tightened to press the outer peripheral surface of the shaft portion 22, the shaft portion 22 is fixed to the shaft hole 37. Here, the tightening torque at the time of completely screwing the female screw portion 61 of the other joint member 32 into the male screw portion 23 of the other shaft portion 22 is set to be larger than the rotation torque of the one shaft portion 21. Accordingly, it is possible to prevent the loosening of the screw between the screw portions 23 and 61 of the other joint member 32 and the other shaft portion 22 due to the rotation of the one shaft portion 21, and to prevent the two shaft portions 21 and 22 from being loosened. The torque transmission performance can be fully exhibited. Specifically, the tightening torque of the other joint member 32 is set in the range of 1.2 times to 12 times the rotational torque of the one shaft portion 21. If the tightening torque is less than 1.2 times the rotational torque of the one shaft portion 21, the screws between the screw portions 23 and 61 of the other joint member 32 and the other shaft portion 22 may be loosened during rotation. If the tightening torque exceeds 12 times the rotational torque of the one shaft portion 21, the screw portions 23 and 61 of the other joint member 32 and the other shaft portion 22 may be damaged and the screwing may be weakened. There is. The rotation torque includes drive torque, allowable torque, instantaneous maximum torque, and the like. Then, as the rotation torque that is the setting reference of the tightening torque, the drive torque, the allowable torque, and the instantaneous maximum value are set in accordance with the specifications (for example, high-speed rotation specification, low-speed rotation specification, etc.) of the device in which the shaft coupling 1 is incorporated. It is selected from torque etc. In this sense, it can be said that the rotation torque is a specification torque determined in a device incorporating the shaft coupling 1.

According to the shaft coupling 1 of the first embodiment having the above-described configuration, the other joint member 32 is provided with the female screw portion 61 in the shaft hole 37 and the nut portion that is screwed into the male screw portion 23 of the other shaft portion 22. Since it is configured, it can also serve as the retaining nut 56 attached adjacent to the bearing 5 in the conventional example shown in FIG. Therefore, the retaining nut 56 is not required, the shaft coupling 1 can be brought close to the bearing 5, and the space for connecting the two shaft portions 21 and 22 can be saved. Therefore, it is possible to meet the demand for space saving of the device including the connecting portion of the two shaft portions 21 and 22 by the shaft coupling 1. Further, since the retaining nut 56 is unnecessary, the number of parts can be reduced and the cost can be reduced.

Further, when the other shaft portion 22 fixed to the other joint member 32 is a ball screw or the like, a load in the thrust direction may be applied to the shaft joint 1. In this case, as in the conventional shaft joint 100 shown in FIG. In the case where the shaft portions 21 and 22 are fitted by reducing the diameters of the shaft holes 133 and 137, two loads, that is, a rotation torque and a load in the thrust direction are applied, and thus the rotation transmission force by the shaft coupling 100 tends to be insufficient. There is a risk that a loss may occur in torque transmission between the two shaft portions 21 and 22. On the other hand, according to the shaft coupling 1 of the first embodiment, the other joint member 32 and the other shaft portion 22 are fixed by screwing the respective screw portions, so that the other shaft relative to the shaft coupling 1 is provided. Even when a load is applied from the portion 22 in the thrust direction, the rotation transmission force of the shaft coupling 1 is sufficiently secured, and the torque transmission performance between the two shaft portions 21 and 22 can be sufficiently exhibited.

Further, in the first embodiment, since the rotation driven shaft (the other shaft portion 22) is fixed to the nut portion (the other joint member 32), the rotation driven shaft (the other shaft portion 22) is added particularly when the rotation is started or stopped, or when the rotation direction is switched. The torque prevents the screw portions 23 and 61 from being loosened.

(Embodiment 2)
As shown in FIG. 3, in the shaft joint 1A according to the second embodiment, a straight smooth curved surface portion 62 is provided in the shaft hole 37 of the other joint member 32 along with the female screw portion 61. The smooth curved surface portion 62 is provided on the outer end surface side that does not face the one joint member 31, and the shaft hole 37 of the smooth curved surface portion 62 is set to an inner diameter that comes into contact with the smooth outer peripheral surface of the other shaft portion 22. To be done.

According to this, when the male screw portion 23 of the other shaft portion 22 is screwed into the female screw portion 61 of the other joint member 32, the smooth curved surface portion 62 of the other joint member 32 is smoothed. By abutting against the outer peripheral surface, the other joint member 32 is fixed so as to be concentric with the other shaft portion 22. Therefore, the shake and vibration of the other joint member 32 due to the rotation of the other shaft portion 22 can be suppressed. Further, since the length of the female screw portion 61 in the shaft hole 37 is set longer than that of the smooth curved surface portion 62, the fixing force due to the screwing of the female screw portion 61 and the male screw portion 23 of the shaft portion 22 is efficiently performed. Can be demonstrated well. If the smooth curved surface portion 62 is made longer than the female screw portion 61, the concentricity between the other joint member 32 and the other shaft portion 22 can be further improved.

Furthermore, by integrally forming the male screw portion 61 and the smooth curved surface portion 62 in the other joint member 32, the axis line of the male screw portion 61 is different from that of the conventional one that requires a separate retaining nut 56. The direction length can be made shorter than that of the conventional retaining nut 56. Therefore, it is possible to further save the space at the connecting portion between the two shaft portions 21 and 22.

Further, in the shaft coupling 1A of the second embodiment, in the pair of joint members 31 and 32, the peripheral wall portions surrounded by small arcs that are slightly smaller than a semicircle on the inner end face sides facing each other are positioned at 180 degrees via the intermediate portion 30. However, the present invention is not limited to this, and for example, the pair of joint members 31 and 32 may be integrally joined at the same location as in the first embodiment. Other configurations and effects of the second embodiment are similar to those of the shaft coupling 1 of the first embodiment.

In addition, in the second embodiment, the smooth curved surface portion 62 is provided on the outer end surface side that does not face the one joint member 31, but in the other shaft portion 22, the end surface side of the male screw portion 23 is a smooth surface. Correspondingly, the smooth curved surface portion 62 may be provided on the end face side facing the one joint member 31.

(Embodiment 3)
As shown in FIGS. 4 and 5, in the shaft coupling 1B of the third embodiment, the other joint member 32 has a large peripheral wall around the shaft hole 37 and has a diameter substantially equal to the outer diameter of the one joint member 31. The diameter portion 71 and a small diameter portion 72 whose peripheral wall around the shaft hole 37 is formed to have a smaller diameter than the large diameter portion 71 are provided. The large diameter portion 71 and the small diameter portion 72 are integrally formed in the axial direction, and the small diameter portion 72 is provided on the outer diameter side of the large diameter portion 71 facing the bearing 5. The other shaft member 22 supported by the bearing 5 is attached to the other joint member 32.

Referring to FIG. 4, the other shaft portion 22 is provided with a male screw portion 23 between a portion of the bearing 5 to which the inner ring 51 is fitted and an end portion protruding from the bearing 5, and the male screw portion 23. The outer peripheral surface on the side closer to the end is a smooth surface. Part or all of the male screw portion 23 is arranged in a recess 54 around the shaft hole provided in the end surface of the bearing 5 facing the shaft joint 1B. In the other shaft portion 22, the shaft diameter of the end portion is formed to be smaller than the screw diameter of the male screw portion 23, but is formed to be the same or larger than the screw diameter of the male screw portion 23. Good. The shaft hole 73 of the large diameter portion 71 is a straight smooth curved surface portion 62, and when the other shaft portion 22 is mounted, this smooth curved surface portion 62 is brought into contact with the smooth outer peripheral surface of the end portion of the other shaft portion 22. It On the other hand, the shaft hole 74 of the small-diameter portion 72 is a female screw portion 61, and the female screw portion 61 is screwed into the male screw portion 23 of the other shaft portion 22 when the other shaft portion 22 is mounted.

The outer diameter of the small diameter portion 72 is set to be smaller than the inner diameter of the recess 54 around the shaft hole provided in the end surface of the bearing 5 facing the shaft coupling 1B. Therefore, the small diameter portion 72 can be inserted into the recess 54 without contacting the inner peripheral wall of the recess 54 of the bearing 5. The outer diameter of the small diameter portion 72 can be set to a size such that a seal member for sealing the grease applied to the bearing 53 and the like can be arranged between the outer diameter of the small diameter portion 72 and the inner peripheral wall of the recess 54. The axial length of the small diameter portion 72 is set to be longer than the depth of the recess 54 when the end surface of the inner ring 51 exposed in the recess 54 of the bearing 5 is the bottom surface of the recess 54. Therefore, when the small diameter portion 72 is put into the recess 54 of the bearing 5 and brought into contact with the end surface of the inner ring 51, the outer end surface of the large diameter portion 71 continuously formed on the small diameter portion 72 (on the side where the small diameter portion 72 is formed). End surface) of the bearing 5 may be in a non-contact state with the facing end surface of the bearing 5. Therefore, when the other shaft portion 22 is mounted on the other joint member 32, when the female screw portion 61 of the small diameter portion 72 is screwed into the male screw portion 23 of the other shaft portion 22, the small diameter portion 72 is mounted on the bearing 5. The small diameter portion 72 can also function as a collar member 55 that prevents the bearing 5 from moving in the axial direction by being inserted into the recess 54 of the end surface of the bearing 5 and brought into contact with the end surface of the inner ring 51 of the bearing 5. .. Since the small diameter portion 72 constitutes a part of the other joint member 32, the shaft coupling 1B can be further moved to the bearing 5 side by the distance corresponding to the distance that the small diameter portion 72 is inserted into the recess 54 of the bearing 5. It is possible to further reduce the space of the connecting portion between the two shaft portions 21 and 22.

The large-diameter portion 71 includes a slit 75 that cuts the shaft hole 37 in the axial direction, and a tightening bolt 77 that is attached so as to intersect with a slit portion 751 that extends from the shaft hole 37 in the outer diameter direction. A shaft tightening mechanism that swings the peripheral wall portion surrounded by the slit 75 toward the shaft hole 37 side to reduce the diameter of the shaft hole 37 and tighten the other shaft portion 22 is provided. The slit 75 extends in the outer diameter direction from the shaft hole 37, becomes R-shaped near the outer diameter, folds back toward the shaft hole 37, and bends around the shaft hole 37, and the end of the slit 75 is connected to the shaft hole 37. The slit 75 is formed so as to be located substantially on a straight line extending from the starting end of the slit 75 through the center point of the shaft hole 37 and to remain in the peripheral wall. The end of the slit 75 is connected to a through hole 78 that penetrates the peripheral wall of the large diameter portion 71 in the axial direction. The peripheral wall portion surrounded by the slit 75 constitutes a swing piece 79 that swings toward the shaft hole 73 side.

The bolt mounting hole 76 of the tightening bolt 77 is provided in the peripheral wall of the large diameter portion 71 so as to intersect with the slit portion 751 extending from the shaft hole 37 in the outer diameter direction, and the head of the tightening bolt 77 mounted in the bolt mounting hole 76. The screw rod portion of the tightening bolt 77 is arranged on the peripheral wall straddling the slit portion 751. As a result, when the tightening bolt 77 is tightened, the swing piece 79 swings toward the shaft hole 37 side, and the shaft hole 37 is reduced in diameter.

Therefore, when the other shaft portion 22 is attached to the other joint member 32, if the tightening bolt 77 is tightened to reduce the diameter of the shaft hole 37 of the large diameter portion 71 and the end portion of the other shaft portion 22 is tightened. Large diameter part 7
The smooth curved surface portion 62 of the first shaft hole 37 and the smooth outer peripheral surface of the other shaft portion 22 are pressed against each other. Therefore, in the shaft hole 37 of the other joint member 32, the respective axial centers of the female screw portion 61 of the small diameter portion 72 and the smooth curved surface portion 62 of the large diameter portion 71 are deviated due to eccentricity, declination, etc. Even in the case, the concentricity between the other shaft portion 22 and the shaft hole 37 of the other joint member 32 is ensured. As a result, vibration or vibration of the other joint member 32 due to the rotation of the other shaft portion 22 can be prevented. Further, since the shaft tightening mechanism of the large diameter portion 71 is configured to reduce the diameter of the shaft hole 37 and tighten the shaft portion 22, the end portion of the shaft portion 22 arranged in the shaft hole 37 has a narrow shaft diameter. Even if it is small (for example, 3 mmΦ or less), the shaft portion 22 can be firmly tightened and fixed. Although the above-mentioned shaft tightening mechanism is also provided in one joint member 31, the present invention is not limited to this, and another mechanism may be adopted.

Further, in the shaft coupling 1B, leaf springs 80 are attached to the opposing end surfaces of the pair of joint members 31 and 32 with fixing bolts 81 with a predetermined space therebetween, and are connected via the leaf springs 80. The mounting position of the peripheral wall by the fixing bolt 81 of the leaf spring 80 is arranged on the peripheral wall portion other than the swing piece 79. Accordingly, when the tightening bolt 77 is tightened, only the swing piece 79, which is a part of the peripheral wall of the large diameter portion 71, swings, and the entire peripheral wall is not deformed. Therefore, since the leaf spring 80 is attached to the peripheral wall portion other than the swinging piece 79 that does not deform, the leaf spring 80 is not deformed by receiving stress from the portion fixed to the joint member 32 when the tightening bolt 77 is tightened. .. Further, since the leaf spring 80 is attached to the peripheral wall portion other than the swing piece 79 which is not deformed, the tightening torque of the tightening bolt 77 acts on the tightening of the swing piece 79 without receiving the stress of the leaf spring 80. be able to. Therefore, the pressure contact force of the shaft hole 73 with respect to the shaft portion 22 can be increased, and the concentricity of the shaft portion 22 with respect to the shaft hole 37 can be reliably ensured. Other configurations and effects of the third embodiment are similar to those of the shaft coupling 1 of the first embodiment.

Although the shaft tightening mechanism in the large diameter portion 71 swings the swinging piece 79 surrounded by the slit 75, the invention is not limited to this, and another configuration may be adopted. For example, as shown in FIG. 5(d), a slit 75a cut from the shaft hole 37 to the outer peripheral surface in the axial direction, and a tightening bolt 77a attached to a bolt mounting hole 76a provided so as to intersect with the slit 75a. And a second slit 75b cut from the outer peripheral surface of the peripheral wall on the side where the head of the tightening bolt 77a is disposed, and the peripheral wall portion between the slit 75a and the second slit 75b by tightening the tightening bolt 77a. May be swung to reduce the diameter of the shaft hole 37 and tighten the other shaft portion 22. Further, the second slit 75b shown in FIG. 5D may be omitted.

Further, in the third embodiment, the shaft hole 37 of the small diameter portion 72 is the female screw portion 61 and the shaft hole 37 of the large diameter portion 71 is the smooth curved surface portion 62, but the other shaft portion 22 has a male screw on the end side. The shaft hole 37 of the small-diameter portion 72 can be the smooth curved surface portion 62 and the shaft hole 37 of the large-diameter portion 71 can be the female screw portion 61 in correspondence with the portion in which the portion 23 is provided. In this case, the large-diameter portion 71 may not be provided with the shaft tightening mechanism, or the shaft portion 22 may be mounted by mounting the holding bolt 39 and the set piece 39a in the screw hole 38 as shown in FIG. It may be fixed.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.
For example, the pair of joint members 31 and 32 are configured as separate bodies, and an intermediate mechanism portion that absorbs a deviation such as eccentricity or declination between the two shaft portions 21 and 22 fixed to the joint members 31 and 32 is formed. It can be configured to be connected. As the intermediate mechanism portion, for example, a cross link 91 (FIG. 6A), an Oldham slider 92 (FIG. 6B), a bending cross leaf spring 93 (FIG. 6C), etc., as shown in FIG. It is also possible to use a leaf spring 80 (FIG. 5) or another elastic body such as a rubber plate. As a result, even if there is axial misalignment such as axial displacement or angular error between the two shaft parts 21 and 22 fixed to the pair of joint members 31 and 32, this axial misalignment is caused by the intermediate mechanism part. Be absorbed. Therefore, the two shaft portions 21 and 22 can be connected without applying a large load to the joint members 31 and 32.
Further, the other joint member 32 is provided with a tool hooking portion so that the female screw portion 61 of the shaft hole 37 can be easily screwed into the male screw portion 23 of the other shaft portion 22 by a tightening tool such as a spanner. Can be Accordingly, the other joint member 32 can be easily fixed to the other shaft portion 22 with a required tightening torque.

1, 1A, 1B Shaft joint 5 Bearing 21 One shaft portion 22 The other shaft portion 23 Male screw portion 31 One joint member 32 The other joint member 33 Shaft hole (one joint member side)
37 Shaft hole (the other joint member side)
54 recessed part 55 collar member 56 retaining nut 61 female screw part 62 smooth curved surface part 71 large diameter part 72 small diameter part 75 slit 80 leaf spring (intermediate mechanism part)
91 Cross Link (Intermediate Mechanism)
92 Oldham slider (intermediate mechanism)
93 Bending cross leaf spring (intermediate mechanism)

Claims (3)

A shaft joint comprising a pair of joint members, each of which has a shaft hole for mounting two rotating shaft parts at its center,
One joint member constitutes a shaft clamp portion that fits one shaft portion into a shaft hole,
The other joint member is provided with a female screw portion in the shaft hole, is arranged adjacent to a bearing supporting the other shaft portion, and the female screw portion is provided in a male screw portion provided on the outer peripheral surface of the other shaft portion. Configure the nut part to be screwed,
The shaft hole of the other joint member is provided with a straight smooth curved surface portion along with the female screw portion,
The shaft hole of the smooth curved surface portion is set to an inner diameter that is brought into contact with the smooth outer peripheral surface of the other shaft portion ,
The other joint member has a large-diameter portion and a small-diameter portion integrally formed in the axial direction,
The small-diameter portion is arranged on the outer end face side facing the bearing, and is configured to be able to come into contact with the end face of the inner ring which is fitted into the shaft portion of the bearing by entering the recess around the shaft hole in the end face of the bearing. A shaft joint that forms a collar member that prevents movement of the bearing in the axial direction . The shaft coupling according to claim 1,
The tightening torque for completing the screwing of the female screw portion of the other joint member to the male screw portion of the other shaft portion is set to be larger than the rotation torque of the one shaft portion of the one joint member. The shaft coupling according to claim 1 or 2,
The pair of joint members is a shaft joint that is configured separately and is connected via an intermediate mechanism portion that absorbs axial misalignment between two shaft portions fixed to each joint member.

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