JP2010203469A - Flexible coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible coupling capable of maintaining rigidity and improving vibration absorbing property. <P>SOLUTION: First and second plate springs 12, 13 are interposed between a driving hub 1 and an intermediate hub 3. A spacer 18 is interposed between the driving hub 1 and the first plate spring 12. The first and second plate springs 12, 13 and the spacer 18 are fixed to the end surface 5 of the driving hub 1 by fastening with two bolts 22. A first elastic body 14 is interposed between the end surface 5 of the driving hub 1 and the first plate spring 12, while a second elastic body 15 is interposed between the end surface 3a of the intermediate hub 3 and the plate spring 13. Rotating motion transmitted to the driving hub 1 by a drive shaft is transmitted to the first and second plate springs 12, 13 via the first transmission bolts 22. When the motion is transmitted to the intermediate hub 3 from the first and second plate springs 12, 13 via bolts (not shown in Fig.), the first and second elastic bodies 14, 15 suppress vibration based on the natural frequency of the first and second plate springs 12, 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flexible shaft provided with a rotational transmission means for transmitting rotational motion of a drive shaft between a drive hub connected to the drive shaft so as to be integrally rotatable and a driven hub connected to the driven shaft so as to be integrally rotatable. It relates to joints.

  Conventionally, in such a rotational transmission means of a flexible shaft joint, a plurality of metal leaf springs are arranged at intervals between the drive hub and the driven hub in the direction of the rotation center line of the drive shaft and the driven shaft. ing. Metal drive members for connecting the drive hub and the metal leaf spring, the driven hub and the metal leaf spring, and the metal leaf springs adjacent to each other are provided.

  Although such a flexible shaft coupling using a metal leaf spring has rigidity, it has a problem of lack of vibration absorption. Therefore, in order to improve vibration absorption, Patent Document 1 discloses that an elastic body such as rubber is interposed between the plurality of transmission claws provided on the drive hub and the plurality of transmission claws provided on the driven hub. There has been proposed a flexible shaft coupling provided with a rotating transmission means.

JP 2006-342886 A

However, the flexible shaft coupling including the elastic body disclosed in Patent Document 1 has a problem of lacking rigidity although it is excellent in vibration absorption.
An object of the present invention is to provide a flexible shaft coupling capable of maintaining rigidity and improving vibration absorption.

  In order to solve the above problems, the invention described in claim 1 is directed to a drive hub that is connected to a drive shaft so as to be integrally rotatable, a driven hub that is connected to a driven shaft so as to be integrally rotatable, In a flexible shaft coupling provided with rotation transmission means for transmitting rotation between hubs, the rotation transmission means is interposed between the leaf springs interposed between the hubs, and between the drive hub and the leaf springs. A plurality of first spacers having a ring shape, a plurality of first transmission bolts for fastening and fixing the leaf springs and the first spacers to the drive hub, and the driven hub and the leaf springs. A plurality of second spacers having a ring shape, and a plurality of second transmission bolts for fastening and fixing the leaf spring and the second spacer to the driven hub, and between the drive hub and the leaf spring, A first elastic body interposed, Between the dynamic hub and plate spring and summarized in that the second elastic member is interposed.

  According to a second aspect of the present invention, in the first aspect, the first and second elastic bodies are arranged between the leaf spring and the driving hub and the leaf spring and the driven hub by the first and second transmission bolts in the assembled state. It is summarized that it is compressed between.

  A third aspect of the invention is that, in the first or second aspect, a ring-shaped auxiliary spacer is interposed between the heads of the first and second transmission bolts and the leaf spring. And

The gist of the invention of claim 4 is that, in any one of claims 1 to 3, a plurality of the leaf springs are laminated.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an intermediate hub is interposed between the drive hub and the driven hub, and the drive hub, the intermediate hub, the intermediate hub, and the driven hub. The gist of the invention is that the rotational transmission means are interposed between the two.

(Function)
According to the present invention, a first elastic body is interposed between an inner end face of a drive hub and one side face of a leaf spring, and the leaf spring is fastened and fixed together with a first spacer to the inner end face of the drive hub by a first transmission bolt. The first elastic body is compressed by one side. Further, the second elastic body is interposed between the end surface of the driven hub and one side surface of the leaf spring, and the other side surface of the leaf spring is fastened and fixed to the end surface of the driven hub together with the second spacer by the second transmission bolt. The second elastic body was compressed. Therefore, the vibration of the leaf spring caused by the rotational motion transmitted from the drive hub to the driven hub is effectively suppressed by the first and second elastic bodies, and the resonance due to the natural frequency of the leaf spring is suppressed, so that the shaft coupling As a result, the power transmission performance can be improved.

  The present invention can maintain rigidity as a flexible shaft coupling and can improve vibration absorption.

The longitudinal cross-sectional view which passes along the two 1st transmission bolts screwed by the drive hub which shows one Embodiment which actualized the bending shaft coupling of this invention. The longitudinal cross-sectional view which passes along the two 2nd transmission bolts screwed by the intermediate hub of the bending shaft coupling. The exploded perspective view of the drive hub of a flexible shaft coupling, the 1st rotation power transmission means, and an intermediate hub. The perspective view of the assembly | attachment state of the drive hub of a bending shaft coupling, a 1st rotation transmission means, and an intermediate | middle hub. The front view of a bending shaft coupling.

A flexible shaft coupling according to an embodiment of the present invention will be described with reference to the drawings.
5 schematically shows a drive hub 1 formed of aluminum, stainless steel or the like, a driven hub 2 also formed of aluminum, stainless steel, or the like, and the drive hub 1 and the driven hub 2. The intermediate hub 3 is interposed between the intermediate hub 3 and the first and second rotational transmission means M1 and M2 interposed between the drive hub 1 and the driven hub 2, respectively. .

  As shown in FIGS. 1 and 3, the outer peripheral surfaces 4 of the drive hub 1 and the driven hub 2 are each formed in a cylindrical shape, and both the inner and outer end surfaces 5 and 6 in the axial direction are formed in a flat shape. A connecting hole 7 having a cylindrical inner peripheral surface 7a is provided in the center of the driven hub 2 in the axial direction. In the drive hub 1 and the driven hub 2, a slit 8 is formed across the outer peripheral surface 4, the inner peripheral surface 7 a and the inner end surface 5. A drive shaft 9 shown in FIG. 5 is inserted into the connection hole 7 from the outer end face 6 side in the drive hub 1. Then, by tightening the drive hub 1 within the range of the slit 8 with the connection screw 10, the diameter of the connection hole 7 is reduced and the drive shaft 9 is connected to the drive hub 1 so as to be integrally rotatable. The driven shaft 11 is inserted into the coupling hole 7 from the outer end surface 6 side in the driven hub 2. Then, by tightening the intermediate hub 3 in the range of the slit 8 with the connecting screw 10, the diameter of the connecting hole 7 is reduced, and the driven shaft 11 is connected so as to be integrally rotatable.

  Since the first and second rotation transmission means M1 and M2 are configured in the same manner, the configuration of the first rotation transmission means M1 will be described. The second rotation transmission means M2 has the same reference numerals for the corresponding members. The explanation will be simplified.

  As shown in FIG. 1 to FIG. 3, screw holes 1 a are provided at two locations spaced 180 ° in the circumferential direction near the outer periphery of the inner end surface 5 of the drive hub 1, and parallel to the axis of the drive hub 1. It is formed toward the outer end face 6 side. Similarly, on the inner end surface 5 of the drive hub 1, as shown in FIG. 2, through holes 1 b are provided at two locations separated by 180 ° in the circumferential direction in parallel with the axis of the drive hub 1 and the outer end surface 6 It is formed to open. On the other hand, the intermediate hub 3 is formed in a ring shape as shown in FIG. 3, and a through hole 3c is formed at the center of both axial end faces 3a and 3b. Two screw holes 3 d are formed in both end faces 3 a and 3 b of the intermediate hub 3 so as to correspond to the two through holes 1 b of the drive hub 1 in parallel with the axis of the drive hub 1. Similarly, a through hole 3 e is formed in the intermediate hub 3 in parallel with the axis of the drive hub 1 so as to correspond to the two screw holes 1 a of the drive hub 1.

As shown in FIGS. 1 to 3, a ring-shaped metal first plate spring 12 and second plate spring 13 are interposed between the drive hub 1 and the intermediate hub 3. Yes. Holes 12a and 13a are formed in the central portions of the first and second leaf springs 12 and 13, and bolt insertion holes 12b and 13b are formed at equal pitches in the circumferential direction at four locations near the outer periphery. Yes. Between the inner end surface 5 of the drive hub 1 and one side surface (left side in FIG. 1) of the first leaf spring 12, a first elastic body 14 having a ring shape formed of rubber, elastomer, resin or the like is formed. Between the one side surface (right side in FIG. 1) of the second leaf spring 13 and the one end surface 3a of the intermediate hub 3, a second elastic body 15 that is also formed of rubber, elastomer, resin, or the like is interposed. Intervened. The rubber hardness of the material of the first and second elastic bodies 14 and 15 is set, for example, in the range of 50 to 80. In this embodiment, the rubber hardness is set to 65, for example. As shown in FIG. 3, large-diameter through holes 14a and 15a are formed at the center of the first and second elastic bodies 14 and 15, and ring spacers 18, 19, The accommodating recesses 14b and 15b that can accommodate 20 and 21 are formed at four locations at equal pitches in the circumferential direction. (See Figure 4)
As shown in FIG. 1, the first leaf spring 12, the second leaf spring 13, the first spacer 18, and the first auxiliary spacer 19 are inserted through the spacers 18, 19, the first and second leaf springs 12, 13. It is fastened and fixed to the inner end face 5 of the drive hub 1 by the heads 22a of the two first transmission bolts 22 that pass through the holes 12b and 13b and are screwed into the two screw holes 1a of the drive hub 1. Yes. With this configuration, the first elastic body 14 is sandwiched between the end face 5 of the drive hub 1 and the first transmission bolt 22. On the other hand, the first and second leaf springs 12, 13 and the second spacer 20, and the second auxiliary spacer 21, as shown in FIG. 2, are both the spacers 20, 21, the first and second leaf springs 12, 13. Are fastened and fixed to the end surface 3a of the intermediate hub 3 by the heads 23a of the two second transmission bolts 23 that pass through the insertion holes 12b and 13b and are screwed into the two screw holes 3d of the intermediate hub 3. ing. With this configuration, the second elastic body 15 is sandwiched between the end surface 3 a of the intermediate hub 3 and the second leaf spring 13.

  The thicknesses t1 of the spacers 18 and 19 and the spacers 20 and 21 are set in the range of 0.5 mm to 1.0 mm. In this embodiment, the thickness t1 is set to 0.8 mm. On the other hand, the thickness t2 dimension of the first and second elastic bodies 14, 15 is larger than the thickness t1 dimension (for example, 0.7 mm to 1.2 mm) when the elastic body is not assembled. The range is set, and in this embodiment, it is set to 1.0 mm. Under these dimensional conditions, the first elastic body 14 is moved into the drive hub 1 by the tightening operation of the first and second leaf springs 12 and 13 and the spacers 18 and 19 by the first transmission bolt 22 shown in FIG. It is held in a compressed state between the end surface 5 and one side surface (left side surface in FIG. 2) of the first leaf spring 12. Similarly, the second elastic body 15 is moved to the end surface 3a of the intermediate hub 3 by the tightening operation of the first and second leaf springs 12, 13 and the spacers 20, 21 by the second transmission bolt 23 shown in FIG. And one side surface of the second leaf spring 13 (the right side surface in FIG. 2). The compressibility of the first and second elastic bodies 14 and 15 is set in a range of 5% to 25% of the thickness t dimension, and is set to 20% in the above embodiment, for example.

  As shown in FIG. 2, the second rotation transmission means M2 includes a first transmission bolt 22 having a function similar to that of the first transmission bolt 22, and a screw hole 3d of the intermediate hub 3 screwed together. As shown, the second transmission bolt 23 having the same function as the second transmission bolt 23 is screwed into the screw hole 2 a of the driven hub 2.

  As shown in FIG. 2, the through-hole 1 b provided in the drive hub 1 allows a second tool such as a hexagon wrench to be used when the second transmission bolt 23 is screwed into the screw hole 3 d of the intermediate hub 3. It is used to engage the head 23a of the transmission bolt 23 and accommodate the head 23a with a gap. The through hole 3e provided in the intermediate hub 3 is a space for accommodating the head portion 22a of the first transmission bolt 22 and the head portion 23a of the second transmission bolt 23 on the second rotational transmission means M2 side with a gap therebetween. Yes. As shown in FIG. 2, when the second transmission bolt 23 on the second rotational transmission means M2 side is screwed into the screw hole 3d of the intermediate hub 3, the through hole 2b provided in the driven hub 2 is 6 A tool such as a square wrench is used to engage the head 23a of the second transmission bolt 23 and to accommodate the head 23a with a gap.

Next, the operation of the flexible shaft joint configured as described above will be described.
When the drive shaft 9 is rotated by a motor (not shown) in the usage state of the flexible shaft coupling shown in FIG. 5, this rotational movement is caused by the first rotation transmission means M1 side shown in FIG. It is transmitted to the two first transmission bolts 22. Then, it is transmitted from the first transmission bolt 22 to the two second transmission bolts 23 shown in FIG. 2 via the first and second leaf springs 12, 13 and transmitted to the intermediate hub 3. The rotational motion transmitted to the intermediate hub 3 is transmitted to the first and second leaf springs 12 and 13 via the first transmission bolt 22 on the second rotational transmission means M2 side shown in FIG. The first and second leaf springs 12 and 13 are transmitted to the driven hub 2 via the two second transmission bolts 23 shown in FIG. Then, the rotational motion transmitted to the driven hub 2 is transmitted to the driven shaft 11.

  During the transmission operation of the rotational motion from the drive shaft 9 to the driven shaft 11 described above, the shaft joint is bent by the elastic force of the first and second leaf springs 12 and 13, and the drive shaft 9 shown in FIG. Even when the central axis 9a and the central axis 11a of the driven shaft 11 are not on the same straight line, the rotational motion is smoothly transmitted.

  (1) In the embodiment, as shown in FIG. 1, the first elastic body 14 is interposed between the inner end surface 5 of the drive hub 1 and one side surface of the first leaf spring 12, and the first The first elastic body 14 is compressed by one side surface of the first leaf spring 12 which is fastened and fixed together with the spacers 18 and 19 to the inner end surface 5 of the drive hub 1 by the transmission bolt 22. Further, as shown in FIG. 2, a second elastic body 15 is interposed between the end face 3 a of the intermediate hub 3 and one side face of the second leaf spring 13, and the end face 3 a of the intermediate hub 3 by the second transmission bolt 23. The second elastic body 15 is compressed by one side surface of the second leaf spring 13 fixed together with the spacers 20 and 21. Therefore, the vibrations of the first and second leaf springs 12 and 13 caused by the rotational motion transmitted from the drive hub 1 to the intermediate hub 3 are suppressed by the first and second elastic bodies 14 and 15, and the first and second Resonance due to the natural frequency of the two leaf springs 12 and 13 is suppressed, and the power transmission performance as a shaft coupling can be improved.

  (2) In the embodiment, the first auxiliary spacer 19 is interposed between the first leaf spring 12 and the head 22a of the first transmission bolt 22, and the second leaf spring 13 and the second transmission bolt. The second auxiliary spacer 21 is interposed between the head 23a of the 23. For this reason, the clamping force of the first and second transmission bolts 22 and 23 can be uniformly transmitted to the first leaf spring 12 and the second leaf spring 13 by the spacers 19 and 21, and both leaf springs 12 and 13 can be transmitted. Can be prevented from being locally deformed by the heads 22a and 23a, and the transmission performance of the rotational motion can be improved.

  (3) In the above embodiment, since the first and second rotational transmission means M1 and M2 are interposed between the drive hub 1 and the intermediate hub 3 and between the intermediate hub 3 and the driven hub 2, it is acceptable as a flexible shaft coupling. The amount of deflection can be set large.

(4) In the above embodiment, since the first and second leaf springs 12 and 13 are used, elastic deformation is facilitated and the drive shaft 9 and the driven shaft are compared with the case where one leaf spring is used. The followability to the bending of the shaft 11 can be improved.
(Example of change)
In the embodiment, the first spacer 18 and the first auxiliary spacer 19 are provided corresponding to the first transmission bolt 22, but the first auxiliary spacer 19 may be omitted. Similarly, although the second spacer 20 and the second auxiliary spacer 21 are provided corresponding to the second transmission bolt 23, the second auxiliary spacer 21 may be omitted.

  In the embodiment, the intermediate hub 3 and the first and second rotation transmission means M1 and M2 are provided. However, the intermediate hub 3 and the second rotation transmission means M2 are omitted, and the driven hub 2 is replaced with the intermediate hub 3. It may be changed.

  In the embodiment, the first elastic body 14 is compressed, but the first elastic body is interposed between the inner end surface 5 of the drive hub 1 and the side surface of the first leaf spring 12 without performing the compression. 14 may be interposed in a contact state. Similarly, the second elastic body 15 may be interposed between the end surface 3a of the intermediate hub 3 and one side surface of the second leaf spring 13 without compressing the second elastic body 15. .

  The first and second leaf springs 12 and 13 may be formed not only from a metal such as stainless steel but also from a material that performs the same function as a metal among ceramics and hard resin.

  DESCRIPTION OF SYMBOLS 1 ... Drive hub, 2 ... Driven hub, 3 ... Intermediate hub, 11 ... Driven shaft, 12, 13 ... Leaf spring, 14 ... 1st elastic body, 15 ... 2nd elastic body, 18 ... 1st spacer, 20 ... 1st 2 spacers, 22 ... 1st transmission bolt, 22a, 23a ... head, 23 ... 2nd transmission bolt.

Claims (5)

A flexible shaft coupling comprising: a drive hub coupled to the drive shaft so as to be integrally rotatable; a driven hub coupled to the driven shaft so as to be integrally rotatable; and a rotation transmission means for transmitting rotation between the hubs. In
The rotation transmission means includes a leaf spring interposed between the hubs, a plurality of ring-shaped first spacers interposed between the drive hub and the leaf spring, the leaf springs and the first spacer. A plurality of first transmission bolts for tightening and fixing the drive hub to the drive hub, a plurality of ring-shaped second spacers interposed between the driven hub and a leaf spring, and the leaf spring and the second spacer. A plurality of second transmission bolts fastened and fixed to the driven hub; a first elastic body is interposed between the drive hub and the leaf spring; and a first elastic body is interposed between the driven hub and the leaf spring. 2. A flexible shaft coupling in which an elastic body is interposed. 2. The first and second elastic bodies according to claim 1, wherein the first and second elastic bodies are compressed between the leaf spring and the driving hub, and the leaf spring and the driven hub by the first and second transmission bolts in the assembled state. A flexible shaft coupling. 3. The flexible shaft coupling according to claim 1, wherein an auxiliary spacer having a ring shape is interposed between the heads of the first and second transmission bolts and the leaf spring. The flexible shaft coupling according to any one of claims 1 to 3, wherein a plurality of the leaf springs are laminated. 5. The intermediate hub according to claim 1, wherein an intermediate hub is interposed between the drive hub and the driven hub, and the rotational transmission means is provided between the drive hub and the intermediate hub and between the intermediate hub and the driven hub. Each of the flexible shaft couplings is characterized by being interposed.

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