JP6524451B2 - Shaft coupling - Google Patents

Description

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

  As shown in FIG. 7, this type of shaft joint 100 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 center of each joint member 131 and 132. Connect the two shaft parts 21 and 22. For example, the shaft coupling 100 is used to connect the rotation drive shaft (one shaft portion 21) and the rotation driven shaft (the other shaft portion 22) supported by the bearing 5. In this case, the other shaft 22 supported by the bearing 5 is attached with a nut 56 for preventing the bearing 5 from coming off. The joint member 132 is fixed.

Unexamined-Japanese-Patent No. 2007-232137

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 The distance between the connecting portions of the two shaft portions 21 and 22 was long. Therefore, with the progress of space saving of various devices in recent years, the conventional shaft joint 100 can not 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-described circumstances, and an object of the present invention is to provide a shaft coupling which can achieve space saving between a bearing and a connecting portion of two shaft portions.

The shaft joint according to the present invention is
A shaft coupling comprising a pair of joint members provided at its center with shaft holes for mounting two rotating shaft portions respectively,
One joint member constitutes a shaft clamp portion in which one shaft portion is fitted in the shaft hole,
The other joint member is provided with a female screw portion in the shaft hole and disposed adjacent to the bearing that supports the other shaft portion, and the above female screw portion is formed on the male screw portion provided on the outer peripheral surface of the other shaft portion. Configure a screw-on nut ,
The other joint member has a large diameter portion and a small diameter portion integrally formed in the axial direction,
The above-mentioned female screw part is provided in the axial hole of the above-mentioned small diameter part,
The shaft hole of the large diameter portion is provided with a straight smooth curved surface portion to be brought into contact with the smooth outer peripheral surface of the other shaft portion,
The large diameter portion is further provided with a slit for cutting the shaft hole in the axial direction, and has a shaft tightening mechanism for reducing the diameter of the shaft hole and tightening the other shaft portion .

According to the above configuration, the other joint member is provided with a female screw portion in the shaft hole and constitutes a nut portion screwed with the male screw portion of the other shaft portion. It can also function as a retaining nut. Therefore, the nut for retaining can be made unnecessary, the shaft joint can be made to approach the bearing, and space saving of the connection portion between the two shaft portions can be achieved. Further, since the retaining nut is not required, the number of parts can be reduced to reduce the cost.
In the other joint member, when the diameter of the shaft hole of the large diameter portion is reduced by the shaft tightening mechanism and the other shaft portion is tightened, the smooth curved surface portion of the large diameter portion and the smooth outer peripheral surface of the other shaft portion Since the respective axial centers of the female screw portion and the smooth curved surface portion are misaligned due to processing errors or the like because they are press-contacted, the other shaft portion and the other joint member are concentric Sex is secured.
By the way, when the other shaft 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 by the diameter reduction of the shaft hole as in the conventional shaft joint. In the case of fitting, since two loads of rotational torque and this load in the thrust direction are applied, there is a possibility that the rotational transmission force by the shaft coupling may be insufficient, and a loss may occur in the torque transmission between the two shaft parts. The
On the other hand, according to the shaft joint of the present invention, since the other joint member and the other shaft portion are fixed by screwing of the respective screw portions, the shaft joint from the other shaft portion in the thrust direction is fixed. Even when a load is applied, the rotational transmission force of the shaft coupling is sufficiently ensured, 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 larger than the rotational torque of the one shaft portion of the one joint member.
According to this, it is possible to prevent loosening of the screw between each screw portion of the other joint member and the other shaft portion due to the rotation of one shaft portion, and sufficient torque transmission performance between the two shaft portions. It can be demonstrated.

In the above shaft coupling,
The shaft hole of the other joint member is provided with a straight smooth curved surface portion along with the female screw portion,
It is desirable that the shaft hole of the smooth curved surface portion be set to an inner diameter that is in contact with the smooth outer peripheral surface of the other shaft portion.
According to this, when screwing the female screw portion of the other joint member to the male screw portion of the other shaft portion, the smooth curved surface portion of the other joint member abuts against the smooth outer peripheral surface of the other shaft portion Thus, the other joint member is fixed so as to be concentric with the other shaft.
In addition, by integrally forming the male screw portion and the smooth curved surface portion in the other joint member, the axial length of the male screw portion can be made longer than in the conventional case where a separate retaining nut is required. It can be shorter than the retaining nut. Therefore, space saving of the connection part of two axial parts can further be achieved.

In the above shaft coupling ,
The small diameter portion is disposed on the outer end face side facing the bearing, and is configured to be able to enter a recess around the shaft hole in the end face of the bearing and abut on the end face of the inner ring externally fitted with the shaft portion in this bearing The collar member may be configured to block movement of the bearing in the axial direction.
According to this, since the small diameter portion constitutes a part of the other joint member, the small diameter portion is disposed in the concave portion of the bearing end face with the function of a collar member for blocking the movement of the bearing in the axial direction. As a result, the shaft coupling can be further moved to the bearing side to save space in the connection portion of the two shaft portions.

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

  According to the shaft joint according to the present invention, the other joint member constitutes a nut portion for screwing the other shaft portion. Therefore, a nut for retaining the other shaft portion supported by the bearing is unnecessary, and the shaft joint It is possible to achieve space saving of the connecting portion of the two shaft portions by bringing the two into close proximity to the bearing. Accordingly, it is possible to meet the space saving requirements for a device having a coupling portion of two shaft portions by a shaft coupling.

FIG. 5 is a front view, partly in section, showing an example of use of the shaft coupling of the first embodiment. It is a figure which shows the axial coupling of Embodiment 1, the same figure (a) is a front view, the same figure (b) is a sectional view of one joint member, the same figure (c) is a sectional view of the other joint member, the same Figure (d) is a plan view. It is a partial cross section front view which shows the usage example of the axial coupling of Embodiment 2. FIG. It is a partially sectioned front view which shows the usage example of the axial coupling of Embodiment 3. FIG. It is a figure which shows the shaft coupling of Embodiment 3, the same figure (a) is a front view, the same figure (b) is a side view of one joint member, the same figure (c) is a side view of the other joint member, the same Figure (d) is a side view showing a modification of the other joint member. It is a front view which shows the various examples of the intermediate mechanism part which connects between a pair of coupling members. It is a partially sectioned 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 according to 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. It has 31 and 32. The shaft coupling 1 transmits the rotational force of one shaft 21 to the other shaft 22. As the two shaft portions 21 and 22, for example, one shaft portion 21 is a rotation drive shaft such as a motor shaft of the drive motor 4, and the other shaft portion 22 is a rotation driven shaft used for various operations such as a ball screw. It is. The rotary driven shaft is supported by the bearing 5 near its end. The bearing 5 has an inner ring 51 externally fitted with the shaft portion 22, an outer ring 52 disposed on the outer periphery of the inner ring 51, and a bearing 53 interposed between the inner ring 51 and the outer ring 52. The portion 22 is rotatably supported. Further, in the bearing 5 end face of the bearing 5 on the side where the end of the shaft 22 is made to project, a recess 54 is provided around the shaft hole, and the collar member 55 is disposed in the recess 54. The collar member 55 prevents the shaft coupling 1 rotating together with the shaft 22 from coming into contact with the end face 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, or aluminum, and the whole is formed in a cylindrical shape, and the shaft portions 21 and 22 are attached to the central portion. Shaft holes 33 and 37 are provided. Further, the pair of joint members 31 and 32 is integrally and continuously formed with a peripheral wall portion surrounded by a small arc slightly smaller than a semicircle on the opposing end face side.

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

  The other joint member 32 is a nut portion to which the other shaft portion 22 which is a rotation driven shaft is fixed, and the other shaft portion 22 is screwed into the shaft hole 37 and fixed. 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 for supporting the same. The shaft hole 37 of the other joint member 32 is provided with a female screw portion 61 which is screwed with the male screw portion 23 of the other shaft portion 22. In the peripheral wall around the shaft hole 37, a screw hole 38 penetrating from the shaft hole 37 to the outer peripheral surface in a direction orthogonal to the axial direction is provided. In this screw hole 38, the outer peripheral surface of the shaft 22 attached to the shaft hole 37 A holding bolt 39 is mounted to hold the holder. The pressing bolt 39 is attached to the screw hole 38 subsequently to the set piece 39 a to be in contact with the outer peripheral surface of the shaft 22. The tool insertion side (the inlet side of the screw hole 38) of the holding bolt 39 is provided in the same direction as the tool insertion side (the inlet side of the bolt mounting hole 36) of the tightening bolt 35 of one joint member 31. There is. As a result, since the tightening operation of the tightening bolt 35 and the pressing bolt 39 can be performed from the same side, the mounting operation of the shaft joint 1 on the two shaft portions 21 and 22 can be efficiently performed.

  Then, the other joint member 32 is disposed adjacent to the bearing 5 that supports the other shaft portion 22, and the female screw of the shaft hole 37 is formed in the male screw portion 23 of the shaft portion 22 supported by the bearing 5. When the portion 61 is screwed in and tightened to a predetermined tightening torque, screwing is completed, and then the holding bolt 39 is tightened to press the outer peripheral surface of the shaft portion 22, whereby the shaft portion 22 is fixed in the shaft hole 37. Here, the tightening torque when screwing the female screw portion 61 of the other joint member 32 to the male screw portion 23 of the other shaft portion 22 is set larger than the rotational torque of the one shaft portion 21. Thereby, the loosening of the screw between the screw parts 23 and 61 of the other joint member 32 and the other shaft 22 due to the rotation of the one shaft 21 can be prevented. Torque transfer performance can be fully demonstrated. Specifically, the tightening torque at the other joint member 32 is set in a range of 1.2 to 12 times the rotational torque at one shaft portion 21. If the tightening torque is less than 1.2 times the rotational torque of one shaft 21, there is a risk that the screw between the other joint member 32 and the other shaft 22 may be loosened during rotation. Also, if the tightening torque exceeds 12 times the rotational torque of one of the shaft portions 21, the screw portions 23, 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 rotational torque includes drive torque, allowable torque, instantaneous maximum torque, and the like. And, as the above-mentioned rotational torque as a setting reference of the above-mentioned tightening torque, corresponding to the specification (for example, high-speed rotation specification, low-speed rotation specification, etc.) of the device incorporating this shaft joint 1 It is selected from among torques and the like. In this sense, it can be said that the above-mentioned rotational torque is a specification torque determined in the device incorporating the shaft coupling 1.

  According to the shaft joint 1 of Embodiment 1 having the above configuration, the other joint member 32 is provided with the female screw portion 61 in the shaft hole 37, and the nut portion screwed with the male screw portion 23 of the other shaft portion 22 is Since it comprises, in the prior art example shown in FIG. 7, it can serve as the function of the nut 56 for drop-off prevention attached adjacent to the bearing 5. FIG. Therefore, the nut for detachment prevention 56 is unnecessary, the shaft joint 1 can be made to approach the bearing 5, and space saving of the connection part of the two shaft parts 21 and 22 can be achieved. Accordingly, it is possible to meet the demand for space saving of the device provided with the connecting portion of the two shaft portions 21 and 22 by the shaft coupling 1. Further, since the retaining nut 56 is not necessary, the number of parts can be reduced to reduce the cost.

  Also, when the other shaft 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, and in this case, as in the conventional shaft joint 100 shown in FIG. In the case where the shaft parts 21 and 22 are fitted by reducing the diameter of the shaft holes 133 and 137, two loads of the rotational torque and the load in the thrust direction are applied, and the rotational transmission force by the shaft coupling 100 tends to be insufficient. A loss may occur in the torque transmission between the two shaft portions 21 and 22. On the other hand, according to the shaft joint 1 of the first embodiment, the other joint member 32 and the other shaft portion 22 are fixed by screwing of the respective screw portions. Even when a load in the thrust direction is applied from the portion 22, the rotation transmission force of the shaft coupling 1 is sufficiently ensured, and 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 22) is fixed to the nut (the other joint member 32), it is added particularly at the start of rotation, stop of rotation, switching of the rotation direction, etc. The torque is prevented from loosening the screw portions 23 and 61.

Second Embodiment
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 face side not facing the one joint member 31, and the axial hole 37 of the smooth curved surface portion 62 is set to an inner diameter to be in contact with the smooth outer peripheral surface of the other shaft portion 22. Be done.

  According to this, when the female screw portion 61 of the other joint member 32 is screwed with the male screw portion 23 of the other shaft portion 22, the smooth curved surface portion 62 of the other joint member 32 is smoothed of the other shaft portion 22 The other joint member 32 is fixed so as to be concentric with the other shaft 22 by being in contact with the outer peripheral surface. Therefore, it is possible to suppress shake, vibration, and the like of the other joint member 32 caused by the rotation of the other shaft portion 22. Further, since the length of the female screw portion 61 in the shaft hole 37 is set longer than the smooth curved surface portion 62, the fixing force by screwing the female screw portion 61 and the male screw portion 23 of the shaft portion 22 is efficient It can be demonstrated well. If the smooth curved surface portion 62 is 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 axial line of the male screw portion 61 is required as compared with the one requiring a separate retaining nut 56 as in the prior art. The directional length can be shorter than the conventional retaining nut 56. Therefore, space saving of the connection part of the two axial parts 21 and 22 can further be achieved.

  Further, in the shaft joint 1A of the second embodiment, the peripheral wall portion surrounded by a small arc slightly smaller than a semicircle on the inner end face side of the pair of joint members 31 and 32 is positioned 180 degrees via the intermediate portion 30 In the same manner, the joint members 31 and 32 may be integrally connected at the same place as in the first embodiment. The configuration and operational effects of the other embodiment 2 are the same as those of the shaft coupling 1 of the embodiment 1.

  In the second embodiment, although the smooth curved surface portion 62 is provided on the outer end face side not facing the one joint member 31, in the other shaft portion 22, the end portion side is smoother than the male screw portion 23. 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 joint 1B of the third embodiment, the other joint member 32 has a large circumferential wall around the shaft hole 37 formed to have substantially the same diameter as the outer diameter of one joint member 31. A diameter portion 71 and a small diameter portion 72 in which a peripheral wall around the shaft hole 37 is formed smaller in 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 end face side facing the bearing 5 in the large diameter portion 71. The other coupling member 32 has the other shaft 22 supported by the bearing 5 attached thereto.

  Referring to FIG. 4, in the other shaft portion 22, a male screw 23 is provided between a portion of the bearing 5 to which the inner ring 51 is externally fitted and an end protruding from the bearing 5. The outer peripheral surface on the end side is smoother than the end surface. The male screw portion 23 is disposed in a recess 54 around an axial hole provided on an end face of the bearing 5 that faces the shaft joint 1B. The shaft diameter of the end portion of the other shaft portion 22 is smaller than the screw diameter of the male screw portion 23, but is formed the same as or larger than the screw diameter of the male screw portion 23 It is also 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, the smooth curved surface portion 62 is in contact with the smooth outer peripheral surface of the end of the other shaft portion 22. Ru. 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 with the male screw portion 23 of the other shaft portion 22 when the other shaft portion 22 is mounted.

  The outer peripheral diameter of the small diameter portion 72 is set to be smaller than the inner diameter of the recess 54 around the axial hole provided on the end face of the bearing 5 opposed to the shaft joint 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 peripheral diameter of the small diameter portion 72 can be set to such a size that a seal member for sealing grease applied to the bearing 53 or the like can be disposed between 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 face of the inner ring 51 exposed to the recess 54 in the bearing 5 is the bottom surface of the recess 54. Therefore, when the small diameter portion 72 is inserted 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 End face of the bearing 5 is not in contact with the opposing end face of the bearing 5. Therefore, when mounting the other shaft portion 22 to the other joint member 32, when the female screw portion 61 of the small diameter portion 72 is screwed to the male screw portion 23 of the other shaft portion 22, the small diameter portion 72 is used as the bearing 5. The small diameter portion 72 can also function as a collar member 55 for blocking the movement of the bearing 5 in the axial direction by entering the recess 54 of the end face of the bearing 5 and bringing it into contact with the end face of the inner ring 51 of the bearing 5 . Since the small diameter portion 72 constitutes a part of the other joint member 32, it is possible to further move the shaft coupling 1B to the bearing 5 side by the distance equivalent to the small diameter portion 72 entering the recess 54 of the bearing 5. Space saving of the connection part of the two axial parts 21 and 22 can further be achieved.

  The large diameter portion 71 includes a slit 75 for cutting the axial hole 37 in the axial direction, and a tightening bolt 77 attached to cross the slit portion 751 extending from the axial hole 37 in the outer diameter direction. A shaft tightening mechanism is provided which swings the peripheral wall portion surrounded by the slits 75 toward the shaft hole 37 to reduce the diameter of the shaft hole 37 and tighten the other shaft portion 22. The slit 75 extends radially outward from the shaft hole 37, and becomes R-shaped near the outer diameter, and is folded back toward the shaft hole 37 and bent around the shaft hole 37, and the end of the slit 75 is connected to the shaft hole 37 It is formed so as to stay substantially in a straight line extending from the beginning of the slit 75 through the center point of the axial hole 37 and stay within the peripheral wall. The end of the slit 75 is connected to a through hole 78 which penetrates the peripheral wall of the large diameter portion 71 in the axial direction. The peripheral wall portion surrounded by the slits 75 constitutes a swinging piece 79 which swings to 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 the slit portion 751 extending outward from the shaft hole 37 and the head of the tightening bolt 77 mounted in the bolt mounting hole 76 The portion is disposed on the swinging piece 79, and the threaded rod portion of the tightening bolt 77 is disposed on the peripheral wall straddling the slit portion 751. Thus, when the fastening bolt 77 is tightened, the swinging piece 79 is swung toward the shaft hole 37, and the shaft hole 37 is contracted.

  Therefore, when attaching the other shaft 22 to the other joint member 32, tightening the tightening bolt 77 to reduce the diameter of the shaft hole 37 of the large diameter portion 71 and tightening the end of the other shaft 22 The smooth curved surface portion 62 of the shaft hole 37 of the large diameter portion 71 and the smooth outer peripheral surface of the other shaft portion 22 are pressure-welded. 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 have eccentricities, deviations or deviations due to processing errors etc. Even in this case, the concentricity between the other shaft 22 and the shaft hole 37 of the other joint member 32 is secured. As a result, it is possible to prevent shake, vibration or the like of the other joint member 32 caused by the rotation of the other shaft 22. 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 disposed in the shaft hole 37 is thin and the shaft diameter is Even if smaller (for example, 3 mm or less), the shaft portion 22 can be firmly fixed. In addition, although the above-mentioned axis | shaft clamping mechanism is provided also in one coupling member 31, not only this but another mechanism may be employ | adopted.

  Further, in the shaft joint 1B, a plate spring 80 is attached to the opposing end face of the pair of joint members 31, 32 with a predetermined interval by a fixing bolt 81, and is connected via the plate spring 80. The mounting position of the peripheral wall by the fixing bolt 81 of the plate spring 80 is disposed in the peripheral wall portion other than the swinging piece 79. Thus, when tightening the tightening bolt 77, only the swinging piece 79 which is a part of the peripheral wall of the large diameter portion 71 swings, and the whole peripheral wall is not deformed. Accordingly, since the plate spring 80 is attached to the non-deformed peripheral wall portion other than the swinging piece 79, the plate spring 80 is not deformed by receiving stress from the fixing portion with the joint member 32 with the tightening of the tightening bolt 77. . Further, since the plate spring 80 is attached to the undeformed peripheral wall portion other than the swinging piece 79, the tightening torque of the tightening bolt 77 acts on the tightening of the swinging piece 79 without receiving the stress of the plate spring 80. be able to. Therefore, the pressing force of the shaft hole 73 to the shaft portion 22 can be increased, and the concentricity of the shaft portion 22 with the shaft hole 37 can be reliably ensured. The configuration and operational effects of the other embodiment 3 are the same as those of the shaft coupling 1 of the embodiment 1.

  In the large diameter portion 71, the shaft tightening mechanism is configured to swing the swinging piece 79 surrounded by the slit 75. However, the present invention is not limited to this and another configuration may be adopted. For example, as shown in FIG. 5 (d), a slit 75a extending from the shaft hole 37 to the outer peripheral surface and cut in the axial direction, and a tightening bolt 77a mounted to a bolt mounting hole 76a provided intersecting 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 fastening bolt 77a is disposed, and the peripheral wall portion between the slit 75a and the second slit 75b by tightening the fastening bolt 77a. By swinging to reduce the diameter of the shaft hole 37 and clamp the other shaft 22. Further, the second slit 75b shown in FIG. 5D may not be provided.

  In the third embodiment, the shaft hole 37 of the small diameter portion 72 is a female screw portion 61, and the shaft hole 37 of the large diameter portion 71 is a smooth curved surface portion 62. The shaft hole 37 of the small diameter portion 72 can be a smooth curved surface portion 62 and the shaft hole 37 of the large diameter portion 71 can be a female screw portion 61 corresponding to the provision of the portion 23. In this case, the above-mentioned shaft tightening mechanism may not be provided in the large diameter portion 71, 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 is good also as composition fixed.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.
For example, the pair of joint members 31 and 32 are separately formed, and an intermediate mechanism portion that absorbs a deviation such as an eccentricity or a declination between the two shaft portions 21 and 22 fixed to the respective joint members 31 and 32. It can be configured to be linked. As this intermediate mechanism portion, for example, a cross link 91 (FIG. 6 (a)), an Oldham slider 92 (FIG. 6 (b)), a bending cross leaf spring 93 (FIG. 6 (c)) and the like as shown in FIG. Other elastic bodies such as a leaf spring 80 (FIG. 5) and a rubber plate can also be used. As a result, even if axial displacement such as axial displacement or angular error occurs between the two shaft portions 21 and 22 fixed to the pair of joint members 31 and 32, this axial displacement is caused by the intermediate mechanism portion. Absorbed Therefore, the two shaft portions 21 and 22 can be connected without applying a large load to the joint members 31 and 32.
Also, a tool hooking portion is provided on the other joint member 32 so that the female screw portion 61 of the shaft hole 37 can be easily tightened with respect to the male screw portion 23 of the other shaft portion 22 by a tightening tool such as a spanner. It can be done. As a result, the other joint member 32 can be easily fixed to the other shaft portion 22 by the necessary tightening torque.

1, 1A, 1B Shaft joint 5 Bearing 21 One shaft 22 Other shaft 23 Male thread 31 One joint member 32 The other joint member 33 Shaft hole (one joint member side)
37 Shaft hole (other joint member side)
54 Recess 55 Color member 56 Nut for retaining 61 61 Female thread 62 Smooth curved surface 71 Large diameter 72 Small diameter 75 Slit 80 Leaf spring (intermediate mechanism)
91 Cross link (intermediate mechanism part)
92 Oldham Slider (Intermediate Mechanism)
93 Bent cruciform leaf spring (intermediate mechanism part)

Claims (5)

A shaft coupling comprising a pair of joint members provided at its center with shaft holes for mounting two rotating shaft portions respectively,
One joint member constitutes a shaft clamp portion in which one shaft portion is fitted in the shaft hole,
The other joint member is provided with a female screw portion in the shaft hole and disposed adjacent to the bearing that supports the other shaft portion, and the above female screw portion is formed on the male screw portion provided on the outer peripheral surface of the other shaft portion. Configure a screw-on nut ,
The other joint member has a large diameter portion and a small diameter portion integrally formed in the axial direction,
The above-mentioned female screw part is provided in the axial hole of the above-mentioned small diameter part,
The shaft hole of the large diameter portion is provided with a straight smooth curved surface portion to be brought into contact with the smooth outer peripheral surface of the other shaft portion,
The shaft joint includes a shaft tightening mechanism provided with a slit for cutting the shaft hole in the axial direction and reducing the diameter of the shaft hole and tightening the other shaft portion . In the shaft coupling according to claim 1,
A shaft coupling in which 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 larger than the rotational torque of the one shaft portion of the one joint member. In the shaft coupling according to claim 1 or 2,
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 coupling of which the shaft hole of the smooth curved surface portion is set to an inner diameter that is in contact with the smooth outer peripheral surface of the other shaft portion. In the shaft coupling according to any one of claims 1 to 3 ,
Upper Symbol small diameter portion is disposed on an outer end face which faces the bearing, configured to abut the end face of the inner ring to be fitted with the shaft portion in the bearing enters into the recess around the shaft hole at the end face of the bearing A shaft joint that constitutes a collar member that prevents axial movement of the bearing. In the shaft coupling according to any one of claims 1 to 4 ,
A shaft joint connected via an intermediate mechanism part which is constituted separately as a pair of joint members and which absorbs axial misalignment between two shaft parts fixed to each joint member.

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