JP2010096273A - Flexible shaft coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible shaft coupling capable of obtaining high centering accuracy between a driving side rotary shaft and a driven side rotary shaft and capable of restricting an outbreak of vibration and noise. <P>SOLUTION: This flexible shaft coupling includes: a coupling member 11; a projecting member 12; a hollow cylindrical member 13; and a driving side hollow collar 14a inserted into a through-hole 22ak provided in the circumferential direction of the coupling member 11 with a predetermined interval. A tip of the projecting member 12 is provided with a spherical element 12k, and a tip of the hollow cylindrical member 13 is provided with a support 13s to support the peripheral part of the spherical element 12k. The inner peripheral part of the through-hole 22ak is formed with a first curved surface curved in the axial direction of a propeller shaft 2 and a differential gear 5 along the same direction. The peripheral part of the driving side hollow collar 14a is formed with a spherical part 14a having a curvature radius Rk fitting the curvature radius L-Rk on an inner side in the radial direction and the curvature radius L+Rk on an outer side in the radial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flexible joint that is interposed between a drive-side rotary shaft and a driven-side rotary shaft and connects the drive-side rotary shaft and the driven-side rotary shaft so as to be displaceable.

  In general, in order to transmit a rotational force from the driving side rotating shaft to the driven side rotating shaft, a joint is connected between the driving side rotating shaft and the driven side rotating shaft. In particular, in torque transmission systems such as automobiles, flexible shaft couplings are used to absorb eccentricity and declination between the rotating shafts, suppress torsional vibrations of the rotating shafts, and reduce impact loads. Has been.

Conventionally, as this type of flexible shaft coupling, for example, a centering member that matches the axes of the drive side rotation shaft and the driven side rotation shaft, and the drive side rotation shaft and the driven side rotation shaft are coupled to transmit power. A hollow collar as a positioning means on the drive side rotating shaft side fitted with a through hole of the coupling member, a hollow collar as a positioning means on the driven side rotating shaft side, and a driving side A bolt in which a bolt is inserted into a yoke provided on each of the rotating shaft and the driven-side rotating shaft and the driving-side rotating shaft and the driven-side rotating shaft are fastened to a coupling member is known (for example, Patent Documents). 1).
Patent No. 3021537

However, in the conventional flexible shaft coupling as described above, the centering member has a centering pin having a projecting portion protruding in the radial direction and a centering bush made of an elastic material so that the projecting portion is fitted to the inner peripheral side. The centering cylinder is provided with a centering pin fixed to the centering cylinder.
For this reason, if there is a misalignment between the drive-side rotating shaft and the driven-side rotating shaft, the centering bush will be deformed, so that the misalignment cannot be finely adjusted and the alignment accuracy is low. It was.
Further, the hollow collars on the drive side rotary shaft side and the driven side rotary shaft side of the coupling member are fitted and fixed in the through holes of the coupling member, and the drive side rotary shaft and the driven side rotary shaft Bolts are inserted into the yokes, the respective hollow collars and the yokes are fastened, and the coupling member, the driving side rotating shaft and the driven side rotating shaft are fixedly integrated.
For this reason, if there is a misalignment between the drive-side rotation shaft and the driven-side rotation shaft, the coupling member is deformed and stress is generated inside. In particular, when the drive-side rotary shaft and the driven-side rotary shaft are connected to each other at an inclination, that is, when a so-called join angle is added and the flexible shaft joint is mounted on a vehicle body or the like, the coupling member is deformed by the amount of the join angle. Stress was generated inside.
In this state, when the drive-side rotating shaft rotates and power is transmitted to the driven-side rotating shaft, periodic forcing acts on the flexible shaft joint, generating vibration and noise in the vehicle on which the flexible shaft joint is mounted. There was a problem of doing.

  The present invention has been made to solve the above-described conventional problems, and provides high centering accuracy between the drive side rotary shaft and the driven side rotary shaft, and suppresses the generation of vibration and noise. It is an object of the present invention to provide a flexible shaft coupling that can be used.

  In order to achieve the above object, the flexible shaft coupling according to the present invention is (1) made of an elastic material, and connects the driving side rotating shaft and the driven side rotating shaft to the driven side rotating shaft from the driving side rotating shaft. An annular coupling member for transmitting power, a projecting member projecting outward in the axial direction from either one of the driving side rotating shaft or the driven side rotating shaft, and the driving side rotating shaft or the driven side rotating shaft A hollow cylindrical member that protrudes outward in the axial direction from either one of the two, and the outer peripheral portion of the protruding member is fitted so that the axes of the drive-side rotary shaft and the driven-side rotary shaft are aligned, and the coupling A hollow collar inserted into a through-hole provided at a predetermined interval in the circumferential direction of the member, and a bolt is inserted into the yoke and the hollow collar provided on the drive-side rotary shaft and the driven-side rotary shaft. By doing A bending shaft joint configured to fasten the driving-side rotation shaft and the driven-side rotation shaft to the coupling member, wherein a spherical body is provided at a distal end portion of the protruding member, and a distal end portion of the hollow cylindrical member Provided with a support for supporting the outer periphery of the sphere, and the inner periphery of the coupling member surrounding the through hole is curved in the same direction along the axial direction of the drive-side rotation shaft and the driven-side rotation shaft. Forming a first curved surface, and forming a second curved surface fitted to the first curved surface on an outer peripheral portion of the hollow collar so that the hollow collar can slide along the first curved surface. It is characterized by doing so.

With this configuration, the sphere of the projecting member and the support of the hollow cylindrical member that supports the outer periphery of the sphere are centered, and the sphere and the support can slide in the axial direction with each other. The axis line of the shaft and the axis line of the driven side rotating shaft are surely matched. That is, high centering accuracy can be obtained with a simple structure.
Further, since the hollow collar is configured to be able to slide on the inner peripheral portion of the coupling member, that is, the hollow collar smoothly rotates the inner peripheral portion of the coupling member around the sphere of the protruding member. Thus, even if the drive side rotary shaft and the driven side rotary shaft are swung, no stress due to the rocking is generated in the bending shaft joint. As a result, since the periodic forcing force due to the torsional rigidity is not generated in the flexible shaft joint, vibration and noise due to the periodic forcing force are not generated. Further, since the periodic forcing is not applied to the flexible shaft joint, the durability of the flexible shaft joint is improved.

  In the flexible shaft coupling described in (1) above, (2) the second curved surface is a spherical surface having a radius Rk centered on the central axis of the hollow collar, and the center of the spherical surface and the protruding member When the distance connecting the center of the sphere provided at the tip of the sphere is L, the radius of curvature of the first curved surface radially outward of the coupling member is L + Rk, and the coupling member The radius of curvature of the first curved surface inward in the radial direction is L-Rk.

  With this configuration, a coupling member that surrounds a through-hole having a radius of curvature R + Rk of a first curved surface radially outward of the coupling member and a radius of curvature L-Rk radially inward of the coupling member by a spherical surface having a radius Rk of the hollow collar. The hollow collar is smoothly rotated without resistance around the sphere of the protruding member with the inner peripheral portion of the projection as a guide. For this reason, even if the drive-side rotary shaft and the driven-side rotary shaft swing, stress due to the swing does not occur in the flexible shaft joint. As a result, since the periodic forcing force due to the torsional rigidity is not generated in the flexible shaft joint, vibration and noise due to the periodic forcing force are not generated. Further, since the periodic forcing is not applied to the flexible shaft joint, the durability of the flexible shaft joint is improved.

  In the flexible shaft coupling described in (1) above, preferably, (3) the cross section of the through hole is formed by a circular cross section having a radius Rk.

  With this configuration, the through hole formed in the coupling member is formed with a circular cross section having a radius Rk that is the same as the radius of curvature Rk of the spherical surface formed in the hollow collar. It is configured to slide only in the axial direction of the ring member and not slide in the circumferential direction of the coupling member. Therefore, the power of the drive side rotary shaft is transmitted to the driven side rotary shaft through the hollow collar with little mechanical loss.

  In the flexible shaft coupling according to the above (1) or (2), (4) it is preferable that the hollow collar is made of a material harder than an elastic material constituting the coupling member.

  With this configuration, since the hollow collar does not deform when sliding in the axial direction of the coupling member, the power of the drive side rotary shaft is transmitted to the driven side rotary shaft through the hollow collar with little mechanical loss. Is done.

  Further, in the flexible shaft coupling described in (1) above, (5) the support is provided on the tip of the hollow cylindrical member and a lubricant is applied.

  With this configuration, when the lubricant is applied to the inside of the support body of the hollow cylindrical member, the sphere of the projecting member slides more smoothly and rotates within the support body without resistance. The joint responds promptly to the swinging of the driving side rotating shaft and the driven side rotating shaft, and the generation of vibration and noise is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to obtain high centering accuracy between a drive side rotating shaft and a driven side rotating shaft, the bending shaft coupling which can suppress generation | occurrence | production of a vibration and noise can be provided.

  Hereinafter, a first embodiment and a second embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a side view of a propeller shaft 1 equipped with a flexible shaft coupling 10, 10a according to a first embodiment of the present invention. 2 is an exploded perspective view in which a part of the flexible shaft joint 10 and the propeller shaft 1 is disassembled, and FIG. 3 is a cross-sectional view showing a cross section of a part of the flexible shaft joint 10 and the propeller shaft 1. FIG. 5 is a partially enlarged cross-sectional view in which a part of FIG. 3 is enlarged, FIG. 5 (a) is a partial cross-sectional view in which a part of the drive side hollow collar 14a is cut, and FIG. It is the side view of the hollow collar seen from A arrow direction of (a). FIG. 6 is a cross-sectional view of the coupling member 11, and FIG. 7 is a cross-sectional view showing the AA cross section of FIG. 6.

First, the configuration will be described.
As shown in FIG. 1, a propeller shaft 1 includes a propeller shaft 2, 3 and a universal joint 4 that connects the propeller shafts 2, 3, and a flexible shaft joint according to the present embodiment that is attached to both ends of the propeller shaft 1. 10, 10a.
The flexible shaft coupling 10 is configured to couple the propeller shaft 2 as a drive side rotation shaft and the differential 5 as a driven side rotation shaft to transmit the power of the propeller shaft 2 to the differential 5.

  The flexible shaft coupling 10a couples an engine-side output shaft 6 (not shown) as a drive-side rotary shaft and a propeller shaft 3 as a driven-side rotary shaft to transmit the power of the output shaft 6 to the propeller shaft 3. It has become. Since this flexible shaft coupling 10a is configured similarly to the flexible shaft coupling 10, the flexible shaft coupling 10 will be described below.

  As shown in FIG. 2, the flexible shaft coupling 10 includes a coupling member 11, a projecting member 12, a hollow cylindrical member 13, and a driving side hollow collar 14 including driving side hollow collars 14 a, 14 b, and 14 c. The driven side hollow collar 15 constituted by the driven side hollow collars 15a, 15b, 15c, the drive side yoke 16, the driven side yoke 17, and the drive side bolt for fastening the drive side hollow collar 14 and the drive side yoke 16 together. 18b, a drive side nut 18n, a driven side bolt 19b for fastening the driven side hollow collar 15 and the driven side yoke 17 and a driven side nut 19n.

  As shown in FIGS. 3 to 7, the coupling member 11 includes a coupling body 21, driving side collar guides 22 a, 22 b, and 22 c that slidably guide the driving side hollow collars 14 a, 14 b, and 14 c, and a driven body Driven side color guides 23a, 23b, 23c for slidably guiding the side hollow collars 15a, 15b, 15c, and driving side bobbins 24a, 24b provided surrounding the outer periphery of the driving side color guides 22a, 22b, 22c , 24c and driven side bobbins 25a, 25b, 25c provided to surround the outer periphery of the driven side color guides 23a, 23b, 23c.

  As shown in FIG. 7, the coupling member 11 includes a tensile member 26aa wound in a loop between the driving side bobbin 24a and the driven side bobbin 25a, and a driven side bobbin 25a and a driving side bobbin 24b. A tensile member 26ab wound around in a loop, a tensile member 26bb wound around in a loop between the driving bobbin 24b and the driven bobbin 25b, and a driven bobbin 25b and a driving bobbin 24c. A tensile member 26bc wound around in a loop, a tensile member 26cc wound around a loop between the driven bobbin 25c and the driving bobbin 24c, and the driven bobbin 25c and the driving bobbin 24a. And a tensile strength member 26ca wound around in a loop.

The tensile member 26aa is stretchable and includes a linear elastic cord having an allowable tensile stress (N / m ² ) greater than the allowable tensile stress (N / m ² ) of the coupling body 21. The tensile member 26aa is, for example, a loop in which an elastic cord made of polyester having tensile elasticity is wound in multiple layers, or a wound elastic cord is covered with a thermoplastic elastomer having a higher elastic modulus. It is comprised by what was formed in the shape.

  The other tensile members 26ab, 26bb, 26bc, 26cc, 26ca are also configured in the same manner as 26aa, and the power of the drive side rotating shaft is transferred from the drive side bobbins 24a, 24b, 24c to the driven side bobbins 25a, 25b, 25c. While transmitting the tensile member 26ab, 26bc, 26ca via the tensile member 26ab, 26bc, 26ca, the power of the driven rotary shaft is transferred from the driven bobbin 25a, 25b, 25c to the driving bobbin 24a, 24b, 24c via the tensile member 26aa, 26bb, 26cc. I try to communicate.

The coupling body 21 is made of an elastic material such as rubber or elastomer having a predetermined allowable tensile stress (N / m ² ), and has a hexagonal cross section, a predetermined thickness t, and flat side surfaces. . Further, the coupling body 21 is formed with a through hole 11k penetrating in the thickness direction and having a hexagonal cross section, and is formed in an annular shape having a predetermined width in the radial direction. The protruding member 12 and the hollow cylindrical member 13 are inserted into the through hole 11k.

Further, as shown in FIG. 2, the coupling body 21 has six through holes 21k1, 21k2, 21k3, 21k4, 21k5, and 21k6 having a circular cross section at equal intervals in the circumferential direction. .
The driving side color guide 22a is inserted into the through hole 21k1 and is fixed to the coupling body 21, and the driving side hollow collar 14a is accommodated in the driving side color guide 22a so as to be slidable in the axial direction. It has become so.

  Similarly to the through hole 21k1, the driving side color guides 22b and 22c and the driven side color guides 23a, 23b and 23c are inserted into the through holes 21k2, 21k3, 21k4, 21k5 and 21k6, respectively. The drive side color guides 22b and 22c and the driven side color guides 23a and 23b are slidable in the axial direction in the drive side hollow collars 14b and 14c and the driven side hollow collars 15a, 15b and 15c, respectively. It is to be accommodated.

As shown in FIGS. 4 and 5 (a) and 5 (b), the drive side hollow collar 14a is made of a highly rigid material such as metal or plastic, and has a bolt insertion hole 14ab in the axial direction. It is formed in a hollow pipe shape. The drive-side hollow collar 14a has a length Lc that is larger than the thickness t of the coupling body 21, and is formed on the left and right sides in the axial direction.
The driving side bolt 18b is inserted into the bolt insertion hole 14ab.
Further, flanges 14af are formed at both ends, and the drive side bolt 18b and the drive side nut 18n are in contact with each other.
In addition, a spherical portion 14ak having a spherical surface with a radius Rk centered on the axial center Pk is formed at the central portion in the axial direction of the drive side hollow collar 14a, and this spherical portion 14ak is formed on the drive side color guide 22a. It is slidably supported within.
Further, the driving side hollow collars 14b and 14c and the driven side hollow collars 15a, 15b and 15c are configured similarly to the driving side hollow collar 14a. The driving side hollow collars 14a, 14b, 14c and the driven side hollow collars 15a, 15b, 15c of the flexible shaft coupling 10 according to the present embodiment constitute a hollow collar of the flexible shaft coupling according to the present invention.

As shown in FIGS. 4 and 6, the driving side color guide 22a has a through hole 22ak formed in the axial direction, and the inner peripheral portion 22an of the driving side color guide 22a surrounding the through hole 22ak has an axial direction. A first curved surface that is curved along is formed.
The first curved surface includes an outer curved surface 22g as a first curved surface radially outward of the coupling body 21, and an inner curved surface as a first curved surface radially inward of the coupling body 21. 22n, and the spherical portion 14ak of the drive side hollow collar 14a is guided by the outer curved surface 22g and the inner curved surface 22n.

As shown in FIG. 6, the intersection of the axis Lh of the coupling body 21 and the line Lv passing through the center of the coupling body 21 in the thickness t direction and orthogonal to the axis Lh is Po, and the line Lv and the axis of the through hole 22ak When the intersection point with Lk is Pk and the distance of the straight line connecting the intersection point Po and the intersection point Pk is L, the curvature radius of the outward curved surface 22g is formed by L + Rk.
Further, the radius of curvature of the inward curved surface 22n is formed by L-Rk.

The cross section cut along the line Lv of the through hole 22ak of the drive side collar guide 22a is a circular cross section having a radius Rk, and when the spherical portion 14ak of the drive side hollow collar 14a is inserted into the through hole 22ak, the spherical portion The outer peripheral portion of 14ak and the inner peripheral portion of the driving side color guide 22a surrounding the through hole 22ak are in contact with each other so that the driving side hollow collar 14a slides in the through hole 22ak of the driving side color guide 22a. ing.
Therefore, the drive-side hollow collar 14a slides only in the axial direction in the drive-side collar guide 22a and does not slide in the circumferential direction of the coupling body 21, so that the propeller shaft 2 input to the drive-side hollow collar 14a. Can be transmitted in the circumferential direction of the coupling body 21.

  The driving side color guides 22b and 22c and the driven side color guides 23a, 23b and 23c are formed in the same manner as the driving side color guide 22a.

  The driving side color guides 22a, 22b, 22c and the driven side color guides 23a, 23b, 23c of the present embodiment constitute a part of the coupling member of the flexible shaft coupling according to the present invention. Accordingly, the inner peripheral portions of the driving side color guides 22b and 22c and the driven side color guides 23a, 23b and 23c of the present embodiment are the inner peripheral portions of the coupling members surrounding the through hole of the flexible shaft coupling according to the present invention. Is configured.

  As shown in FIGS. 2 to 4, the protruding member 12 is made of a highly rigid material such as a metal, and is formed so as to protrude outward in the axial direction from the end of the differential 5 as the driven side rotating shaft. The projecting part 12t and the spherical body 12k as the outer peripheral part of the projecting member 12 formed at the tip part are configured. As shown in FIG. 4, the protrusion 12t has a press-fitting hole 5h formed coaxially at the tip of the rotary shaft 5a of the differential 5 so as to coincide with the axis of the rotary shaft 5a. The projecting member 12 is press-fitted and rotates together with the rotating shaft 5a.

  When the propeller shaft 2 and the differential 5 are coupled by the flexible shaft coupling 10, the protruding member 12 of the differential 5 is arranged such that the center of the sphere 12 k is positioned at the center Po of the coupling body 21 shown in FIG. 6. It is formed at the end.

  As shown in FIGS. 2 to 4, the hollow cylindrical member 13 is made of a highly rigid material such as metal, and protrudes outward in the axial direction from the end of the propeller shaft 2 as a drive side rotating shaft. The hollow cylindrical portion 13c is formed at the tip, and the support 13s is formed at the tip and supports the outer peripheral portion of the spherical body 12k of the protruding member 12.

  As shown in FIG. 4, the hollow cylindrical portion 13 c is formed at the tip end portion of the propeller shaft 2 in the press-fitting hole 2 a formed coaxially so as to coincide with the axis of the propeller shaft 2. The hollow cylindrical member 13 rotates together with the propeller shaft 2.

The support 13s has a through hole 13k that passes coaxially so as to coincide with the axis of the propeller shaft 2, and the sphere 12k of the protruding member 12 is inserted into the through hole 13k, and the sphere 12k is inserted into the support 13s. It is supported and can slide smoothly in the axial direction.
The hollow cylindrical portion 13c communicates with the through hole 13k and is formed with a through hole 13h having a diameter larger than that of the through hole 13k, so that the hollow cylindrical portion 13c is reduced in weight.

  The spherical body 12k can be smoothly rotated in an arbitrary direction within the support body 13s, and the support body 13s surrounding the through hole 13k can be smoothly rotated and slid without any resistance. Lubricant is applied to the inner wall.

  As shown in FIG. 2, the drive side yoke 16 includes yokes 16 a, 16 b, and 16 c that protrude radially at the end of the propeller shaft 2 and are formed at equal intervals in the circumferential direction. A through-hole 16ak is formed at the end of the yoke 16a so that the driving side bolt 18b is inserted therethrough. The through hole 16ak is formed at a position where its axis coincides with the axis of the through hole 21k1 of the coupling body 21, and as shown in FIG. 3, the drive side bolt 18b is connected to the through hole 16ak and the drive side. The hollow collar 14a is inserted into the bolt insertion hole 14ab. The other yokes 16b and 16c are formed in the same manner as the yoke 16a.

  The driven-side yoke 17 is configured by yokes 17a, 17b, and 17c that protrude in the radial direction at the end portion of the differential 5 and are formed at equal intervals in the circumferential direction. A through hole 17ak is formed at the end of the yoke 17a, and the driven bolt 19b is inserted therethrough. The through-hole 17ak is formed at a position where its axis coincides with the axis of the through-hole 21k2 of the coupling body 21, and the driven bolt 19b is connected to the through-hole 17ak and the driven-side as shown in FIG. The hollow collar 15b is inserted into the bolt insertion hole 15bb. The other yokes 17b and 17c are formed in the same manner as the yoke 17a.

Next, the operation of the flexible shaft coupling 10 according to the present embodiment will be described.
FIG. 8 is a cross-sectional view of the flexible shaft coupling according to the first embodiment of the present invention, showing a state where the propeller shaft and the differential are inclined.

  When an engine (not shown) is started, the power of the output shaft 6 shown in FIG. 1 of the transmission is transmitted to the propeller shaft 3 through the flexible shaft joint 10 a and is transmitted to the propeller shaft 2 through the universal joint 4. Then, the power of the propeller shaft 2 is transmitted to the differential 5 through the flexible shaft coupling 10, and the rear wheels (not shown) are respectively driven.

  At this time, the power of the propeller shaft 2 is simultaneously transmitted to the yokes 16a, 16b, and 16c, and the power is transmitted to the drive side hollow collars 14a, 14b, and 14c fixed to the yokes 16a, 16b, and 16c shown in FIG. The

  When the torque is transmitted to the coupling body 21 so as to rotate in the direction of the arrow C shown in FIG. 7 when this power is rotated clockwise as viewed from the propeller shaft 2 in the direction of the flexible shaft coupling 10, for example, The driving side color guides 22a, 22b, and 22c are pressed in the direction of arrow C by the collars 14a, 14b, and 14c, and at the same time, the driving side bobbins 24a, 24b, and 24c are pressed in the direction of arrow C.

  Then, the tensile members 26ca, 26ab, 26bc indicated by dotted lines are pulled by the driving bobbins 24a, 24b, 24c in the direction of arrow C, and the driven bobbins 25a, 25b, 25c are pulled by the tensile members 26ca, 26ab, 26bc. The driven hollow collars 15a, 15b, 15c are pulled through the side collar guides 23a, 23b, 23c, and the driven yokes 17a, 17b, 17c are rotated in the direction of the arrow C through the driven bolt 19b. Power is transmitted to.

  When torque is transmitted to the coupling body 21 so that this power rotates in the direction opposite to the arrow C direction, the driving side color guides 22a, 22b, and 22c are moved in the arrow C direction by the driving side hollow collars 14a, 14b, and 14c. At the same time, the drive side bobbins 24a, 24b, 24c are pressed in the direction opposite to the arrow C direction.

  Then, the tensile members 26aa, 26bb, and 26cc indicated by solid lines are pulled by the driving bobbins 24a, 24b, and 24c in the direction opposite to the arrow C direction, and the driven bobbins 25a, 25b, and 25c are pulled by the tensile members 26aa, 26bb, and 26cc. The driven-side hollow collars 15a, 15b, 15c are pulled through the driven-side color guides 23a, 23b, 23c, and the driven-side yokes 17a, 17b, 17c are in the direction opposite to the arrow C direction through the driven-side bolt 19b. And the power is transmitted to the differential 5.

  In the flexible shaft coupling 10 according to the present embodiment, as shown in FIG. 8, even if the propeller shaft 2 is inclined at an angle α with respect to the axes of the propeller shaft 2 and the differential 5, Since the drive side hollow collars 14a, 14b, 14c rotate around the center, no stress is generated in the coupling body 21. Further, even if the rotation shaft 5a of the differential 5 is inclined at an angle β with respect to the axis of the propeller shaft 2 and the differential 5, the driven-side hollow collars 15a, 15b, and 15c rotate around the spherical body 12k of the protruding member 12. As a result, the coupling body 21 is not stressed.

  The angle α and the angle β are appropriately selected based on the setting conditions such as the structure, shape, and size of the propeller shaft 1 to which the flexible shaft joint 10 is attached, the size of the flexible shaft joint 10, and the like, for example, the flexible shaft joint. The joint angle when 10 is mounted on the vehicle is in the range of 0 degrees to several degrees. Even if the propeller shaft 2 and the differential 5 are swung within the range of the angle α and the angle β, the bending shaft joint 10 is not subjected to stress due to the swing. Therefore, if the joint angle between the propeller shaft 2 and the differential 5 is within the range of the angle α and the angle β, the joint is mounted on the flexible shaft joint 10 in a state where no stress is generated.

  Since the flexible shaft coupling 10 according to the present embodiment is configured as described above, the following effects can be obtained.

  That is, it is made of an elastic material, and includes a coupling member 11, a protruding member 12, a hollow cylindrical member 13, a driving side hollow collar 14 and a driven side hollow collar 15, and a spherical body 12 k at the tip of the protruding member 12. And a support 13s that supports the outer periphery of the spherical body 12k is provided at the tip of the hollow cylindrical member 13, and the coupling member 11 has a drive surface having an inner curved surface and an outer curved surface as the first curved surface. Drive-side hollow collars 14a, 14b, 14c, which have side color guides 22a, 22b, 22c and driven-side color guides 23a, 23b, 23c, and in which a spherical portion 14ak having a spherical surface as a second curved surface is formed. The driven side hollow collars 15a, 15b, 15c are configured to be able to slide in the driving side color guide and the driven side color guide. That.

  As a result, the spherical body 12k of the protruding member 12 and the support body 13s of the hollow cylindrical member 13 that supports the outer periphery of the spherical body 12k are centered, and the spherical body 12k and the support body 13s are rigid bodies that are not easily deformed. Since they are formed and can slide in the axial direction, the axis of the propeller shaft 2 and the axis of the differential 5 can be reliably matched. That is, there is an effect that a high centering accuracy can be obtained with a simple structure.

  Further, the driving side hollow collars 14a, 14b, 14c and the driven side hollow collars 15a, 15b, 15c slide in the driving side color guides 22a, 22b, 22c and the driven side color guides 23a, 23b, 23c of the coupling member 11, respectively. Since the drive side hollow collars 14a, 14b, 14c and the driven side hollow collars 15a, 15b, 15c are configured to be movable, the drive side color guides 22a, 22b, 22c and the driven side color guides 23a, 23b, 23c is configured to rotate around the spherical body 12k of the projecting member 12, even if the propeller shaft 2 and the differential 5 swing within the range of the angle α and the angle β, the flexible shaft coupling 10 There is no stress caused by rocking. As a result, since the periodic forcing force due to the torsional rigidity is not generated in the bending shaft joint 10, there is an effect that vibration and noise due to the periodic forcing force are not generated.

  In addition, since the periodic forcing is not applied to the flexible shaft coupling 10, there is an effect that the durability of the flexible shaft coupling 10 is improved. In addition, since the bending shaft coupling 10 can be mounted on the vehicle in a state where the joint angle is within the range of the angle α and the angle β, and the periodic forcing force due to the stiffness is not generated in the bending shaft coupling 10, the bending shaft coupling can be mounted. 10 has the effect of increasing the degree of freedom of installation.

  On the other hand, the through holes 22ak formed in the driving side color guides 22a, 22b, and 22c and the driven side color guides 23a, 23b, and 23c of the coupling member 11 have a cross section in terms of the driving side hollow collars 14a, 14b, and 14c. And the driven-side hollow collars 15a, 15b, 15c are formed in a circular cross section having the same radius Rk as the radius of curvature Rk of the spherical portion 14ak formed in the driven-side hollow collars 15a, 15b, 15c. 15a, 15b, 15c slides only in the axial direction of the driving side color guides 22a, 22b, 22c and the driven side color guides 23a, 23b, 23c, and does not slide in the circumferential direction of the coupling member 11. ing.

  Therefore, the power of the propeller shaft 2 is mechanically lost from the driving side hollow collars 14a, 14b, 14c to the driven side hollow collars 15a, 15b, 15c via the tensile members 26aa, 26ab, 26bb, 26bc, 26ca, 26cc. Is transmitted to the differential 5 in a state where there is little.

  Further, since the lubricant is applied to the inside of the support 13s of the hollow cylindrical member 13, the spherical body 12k of the protruding member 12 smoothly slides and rotates in the support 13s, so that the bending shaft The joint 10 can quickly respond to the swinging of the propeller shaft 2 and the differential 5, and the generation of vibration and noise is suppressed.

  In the bending shaft joint 10 according to the present embodiment, the protruding member 12 is provided on the differential 5 as the driven side rotating shaft, and the hollow cylindrical member 13 is provided on the propeller shaft 2 as the driving side rotating shaft. However, the flexible shaft coupling according to the present invention may have other configurations. For example, the projecting member may be provided on the drive side rotation shaft, and the hollow cylindrical member may be provided on the driven side rotation shaft. Also in this case, the same operation as that of the flexible shaft coupling 10 can be obtained.

  Moreover, in the flexible shaft coupling 10 which concerns on this Embodiment, although the case where the external shape of the coupling member 11 and the through-hole 11k were formed in the hexagon was demonstrated, in the flexible shaft coupling which concerns on this invention, another shape is demonstrated. You may make it form in. For example, the outer shape and the through hole of the coupling member may be formed in a circular shape.

  Further, in the flexible shaft coupling 10 according to the present embodiment, the driving side hollow collar 14a and the driven side hollow collar 15a are inserted through the driving side bolt 16b and the driving side nut 18n through the driving side yoke 16 and the driven side yoke 17. The case of fixing was explained. However, the flexible shaft coupling according to the present invention may be constituted by other fixing means. For example, studs corresponding to the drive side bolts 18b may be fixed to the drive side yoke 16 and the driven side yoke 17, respectively, and the drive side hollow collar 14a and the driven side hollow collar 15a may be fixed to the studs. .

  Further, in the flexible shaft coupling 10 according to the present embodiment, the drive side yoke 16 is formed at three positions of the yokes 16a, 16b and 16c, and the driven side yoke 17 is formed at the three positions of the yokes 17a, 17b and 17c. The case where it was configured to be explained. However, in the flexible shaft coupling according to the present invention, the drive side yoke 16 and the driven side yoke 17 may be configured in other shapes. For example, each of the drive side yoke and the driven side yoke may be composed of two yokes, or may be composed of a plurality of four or more. In this case, the drive side hollow collars and the driven side hollow collars may be configured in numbers corresponding to the number of drive side yokes and driven side yokes, respectively.

(Second Embodiment)
FIG. 9 is a side view of the propeller shaft 100 equipped with the flexible shaft couplings 110 and 110a according to the second embodiment of the present invention. FIG. 10 is an exploded perspective view in which a part of the flexible shaft coupling 110 and the propeller shaft 100 is disassembled, and FIG. 11 is a cross-sectional view illustrating a cross section of a part of the flexible shaft coupling 110 and the propeller shaft 100. FIG. 12 is a cross-sectional view of the coupling member 111 of the flexible shaft coupling 110, and FIG. 13 is a side view of the coupling member 111 of the flexible shaft coupling 110.

  In addition, in the flexible shaft coupling 110 which concerns on 2nd Embodiment, although the coupling member 11 of 1st Embodiment differs, the other structure is comprised similarly. Therefore, the same configuration will be described using the same reference numerals as those in the first embodiment shown in FIGS. 1 to 8, and only differences will be described in detail.

First, the configuration of the flexible shaft coupling 110 according to the second embodiment will be described.
As shown in FIG. 9, the propeller shaft 100 includes the propeller shafts 2 and 3, the universal joint 4 that connects the propeller shafts 2 and 3, and the flexible shaft couplings 110 and 110 a according to the present embodiment that are attached to both ends thereof. I have.

As in the first embodiment, the flexible shaft coupling 110 couples the propeller shaft 2 as the driving side rotation shaft and the differential 5 as the driven side rotation shaft to transmit the power of the propeller shaft 2 to the differential 5. It is like that.
The flexible shaft coupling 110a couples the output shaft 6 on the engine side (not shown) as the drive side rotation shaft and the propeller shaft 3 as the driven side rotation shaft to transmit the power of the output shaft 6 to the propeller shaft 3. It has become. Since the flexible shaft coupling 110a is configured in the same manner as the flexible shaft coupling 110, the flexible shaft coupling 110 will be described below.

  As shown in FIG. 10, the flexible shaft coupling 110 includes a coupling member 111, a protruding member 12, a hollow cylindrical member 13, and a driving side hollow collar 14 including driving side hollow collars 14 a, 14 b, and 14 c. A driven side collar 115 composed of driven side collars 115a, 115b, 115c, a drive side yoke 16, a driven side yoke 17, a drive side bolt 18b for fastening the drive side hollow collar 14 and the drive side yoke 16; The drive side nut 18n is configured to include a driven side bolt 19b and a driven side nut 19n that fasten the driven side collar 115 and the driven side yoke 17.

  As shown in FIGS. 10 to 13, the coupling member 111 includes a coupling body 121, driving side color guides 22 a, 22 b, and 22 c that slidably guide the driving side hollow collars 14 a, 14 b, and 14 c, and driven The side collars 115a, 115b, 115c, the drive side bobbins 24a, 24b, 24c provided to surround the outer periphery of the drive side color guides 22a, 22b, 22c, and the outer periphery of the driven side collars 115a, 115b, 115c And driven side bobbins 125a, 125b, and 125c.

  As shown in FIG. 13, the coupling member 111 includes a tensile member 126aa wound in a loop between the driving side bobbin 24a and the driven side bobbin 125a, and a driven side bobbin 125a and the driving side bobbin 24b. A tensile member 126ab wound around in a loop, a tensile member 126bb wound around in a loop between the driving bobbin 24b and the driven bobbin 125b, and a driven bobbin 125b and a driving bobbin 24c. A tensile member 126bc wound around in a loop, a tensile member 126cc wound around the driven bobbin 125c and the driving bobbin 24c, and a driven bobbin 125c and the driving bobbin 24a. And a tensile strength member 126ca wound around in a loop.

Similar to the first embodiment, the tensile member 126aa is elastic and has a linear elasticity having an allowable tensile stress (N / m ² ) greater than the allowable tensile stress (N / m ² ) of the coupling body 121. Consists of code. The tensile member 126aa is formed by, for example, looping an elastic cord made of polyester having tensile elasticity or the like, or covering a wound elastic cord with a thermoplastic elastomer having a higher elastic modulus. It is comprised by what was formed in the shape.

  The other tensile members 126ab, 126bb, 126bc, 126cc, 126ca are also configured in the same manner as 126aa, and the power of the driving side rotating shaft is transferred from the driving side bobbins 24a, 24b, 24c to the driven side bobbins 125a, 125b, 125c. The tensile force members 126ab, 126bc, and 126ca transmit power, and the power of the driven side rotation shaft is transmitted from the driven side bobbins 125a, 125b, and 125c to the driving side bobbins 24a, 24b, and 24c via the tensile strength members 126aa, 126bb, and 126cc. I try to communicate.

The coupling body 121 is made of an elastic material such as rubber or elastomer having a predetermined allowable tensile stress (N / m ² ), as in the first embodiment, and has a hexagonal cross section, a predetermined thickness t, It has flat sides. Further, the coupling body 121 is formed with a through hole 111k penetrating in the thickness direction and having a hexagonal cross section, and is formed in an annular shape having a predetermined width in the radial direction. The protruding member 12 and the hollow cylindrical member 13 are inserted into the through hole 111k.

  Further, as shown in FIG. 2, the coupling body 121 has six through holes 21k1, 21k2, 21k3, 21k4, 21k5, and 21k6 having a circular cross section at equal intervals in the circumferential direction. . The driving side color guide 22a is inserted into the through-hole 21k1 and is fixed to the coupling body 121, and the driving side hollow collar 14a is accommodated in the driving side color guide 22a so as to be slidable in the axial direction. It has become so.

  Similarly to the through hole 21k1, the driving side color guides 22b and 22c and the driven side color guides 23a, 23b, and 23c are inserted into the through holes 21k2, 21k3, 21k4, 21k5, and 21k6, respectively. The driving-side collar guides 22b and 22c are housed inside the driving-side collar guides 22b and 22c so that the driving-side hollow collars 14b and 14c are slidable in the axial direction. The driven side collars 115a, 115b, and 115c are inserted into the through holes 21k2, 21k4, and 21k6 and fixed to the coupling body 121, and the driven side bolts 19b are inserted into the driven side collars 115a, 115b, and 115c, respectively. It has become so.

As shown in FIGS. 10 to 12, the driven side collar 115b has a through hole 115bk in the axial direction and is formed in a cylindrical shape. A driven side bolt is inserted into the through hole 115bk, and the propeller shaft is inserted. 2 and differential 5 are combined.
The driven side collars 115a and 115c are configured similarly to the driven side collar 115b.

Next, the operation of the flexible shaft coupling 110 according to the present embodiment will be described.
FIG. 14 is a cross-sectional view of the flexible shaft coupling according to the second embodiment of the present invention, showing a state where the differential is inclined.

When the engine (not shown) is started, the power of the output shaft 6 shown in FIG. 1 of the transmission is transmitted to the propeller shaft 3 via the flexible shaft joint 110a and the propeller shaft is connected via the universal joint 4 as in the first embodiment. 2 is transmitted. The power of the propeller shaft 2 is transmitted to the differential 5 via the flexible shaft coupling 110, and the rear wheels (not shown) are driven.
At this time, the power of the propeller shaft 2 is simultaneously transmitted to the yokes 16a, 16b, and 16c, and the power is transmitted to the drive side hollow collars 14a, 14b, and 14c fixed to the yokes 16a, 16b, and 16c shown in FIG. The

  When the torque is transmitted to the coupling main body 121 so as to rotate in the direction of the arrow D shown in FIG. 13 when this power is rotated clockwise from the propeller shaft 2 in the direction of the flexible shaft coupling 110, for example, the drive side hollow The driving side color guides 22a, 22b, and 22c are pressed in the direction of arrow D by the collars 14a, 14b, and 14c, and at the same time, the driving side bobbins 24a, 24b, and 24c are pressed in the direction of arrow D.

  The tensile strength members 126ca, 126ab, 126bc indicated by dotted lines are pulled in the direction of the arrow D by the driving side bobbins 24a, 24b, 24c, and the driven side bobbins 125a, 125b, 125c are pulled by the tensile strength members 126ca, 126ab, 126bc. The side collars 115a, 115b, and 115c are pulled, and the driven side yokes 17a, 17b, and 17c are rotated in the direction of arrow D through the driven side bolt 19b, and the power is transmitted to the differential 5.

  When torque is transmitted to the coupling main body 121 so that this power rotates in the direction opposite to the arrow D direction, the drive side color guides 22a, 22b, and 22c are moved in the arrow D direction by the drive side hollow collars 14a, 14b, and 14c. At the same time, the drive side bobbins 24a, 24b, 24c are pressed in the direction opposite to the arrow D direction.

  Then, the tensile members 126aa, 126bb, and 126cc shown by solid lines are pulled by the driving bobbins 24a, 24b, and 24c in the direction opposite to the arrow D direction, and the driven bobbins 125a, 125b, and 125c are pulled by the tensile members 126aa, 126bb, and 126cc. Then, the driven side collars 115a, 115b, and 115c are pulled, and the driven side yokes 17a, 17b, and 17c rotate in the direction opposite to the arrow D direction via the driven side bolt 19b, and the power is transmitted to the differential 5.

  In the flexible shaft coupling 110 according to the present embodiment, as shown in FIG. 14, even if the propeller shaft 2 is inclined at an angle θ with respect to the axis of the propeller shaft 2 and the differential 5, Since the drive side hollow collars 14a, 14b, 14c rotate around the center, no stress is generated in the coupling body 21.

  This angle θ is appropriately selected based on setting conditions such as the structure, shape, and size of the propeller shaft 1 to which the flexible shaft coupling 110 is attached, the size of the flexible shaft coupling 110, and the like. The joint angle when mounted on is in the range of 0 degrees to several degrees. Even if the propeller shaft 2 and the differential 5 are swung within the range of the angle θ, the bending shaft coupling 110 is not subjected to stress due to the swing. Therefore, if the joint angle of the propeller shaft 2 and the differential 5 is within the range of the angle θ, the joint is mounted on the flexible shaft coupling 110 in a state where no stress is generated.

  Since the flexible shaft coupling 110 according to the present embodiment is configured as described above, the following effects can be obtained.

  That is, it is made of an elastic material, and includes a coupling member 111, a protruding member 12, a hollow cylindrical member 13, a driving side hollow collar 14 and a driven side collar 115, and a spherical body 12 k at the tip of the protruding member 12. And a support body 13s that supports the outer periphery of the spherical body 12k at the tip of the hollow cylindrical member 13, and the coupling member 111 has an inner curved surface and an outer curved surface as a first curved surface. The drive-side hollow collars 14a, 14b, 14c having the color guides 22a, 22b, 22c and having the spherical portion 14ak having the spherical surface as the second curved surface can slide in these drive-side color guides. It is configured as follows.

  As a result, the spherical body 12k of the protruding member 12 and the support body 13s of the hollow cylindrical member 13 that supports the outer periphery of the spherical body 12k are centered, and the spherical body 12k and the support body 13s are rigid bodies that are not easily deformed. Since they are formed and can slide in the axial direction, the axis of the propeller shaft 2 and the axis of the differential 5 can be reliably matched. That is, there is an effect that a high centering accuracy can be obtained with a simple structure.

  Further, since the drive side hollow collars 14a, 14b, and 14c can be slid within the drive side color guides 22a, 22b, and 22c of the coupling member 111, that is, the drive side hollow collars 14a, 14b, 14c is configured to rotate in the driving side color guides 22a, 22b, and 22c around the spherical body 12k of the projecting member 12, so that the propeller shaft 2 and the differential 5 are swung within the range of the angle θ. However, no stress due to swinging is generated in the flexible shaft coupling 110. As a result, since the periodic forcing force due to the torsional rigidity is not generated in the flexible shaft coupling 110, there is an effect that vibration and noise due to the periodic forcing force are not generated. In addition, since the periodic forcing is not applied to the flexible shaft coupling 110, there is an effect that the durability of the flexible shaft coupling 110 is improved.

  In addition, since the periodic forcing is not applied to the flexible shaft coupling 110, there is an effect that the durability of the flexible shaft coupling 110 is improved. Further, since the bending shaft coupling 110 can be mounted on the vehicle in a state where the joint angle is within the range of the angle θ and the cyclic forcing due to the rigidity is not generated in the bending shaft coupling 110, the installation of the bending shaft coupling 110 is possible. Has the effect of increasing the degree of freedom.

  On the other hand, the through-holes 22ak formed in the drive side collar guides 22a, 22b, and 22c of the coupling member 111 have a cross-section whose radius of curvature is the spherical portion 14ak formed in the drive side hollow collars 14a, 14b, and 14c. Since it is formed in a circular cross section having the same radius Rk as Rk, the drive side hollow collars 14a, 14b, 14c slide only in the axial direction of the drive side collar guides 22a, 22b, 22c, and the coupling member 111 The structure does not slide in the circumferential direction.

  Therefore, the power of the propeller shaft 2 is mechanically lost from the driving side hollow collars 14a, 14b, 14c to the driven side collars 115a, 115b, 115c via the tensile members 126aa, 126ab, 126bb, 126bc, 126ca, 126cc. It is transmitted to the differential 5 in a small state.

  Further, since the lubricant is applied to the inside of the support 13s of the hollow cylindrical member 13, the spherical body 12k of the protruding member 12 smoothly slides and rotates in the support 13s, so that the bending shaft The joint 10 can quickly respond to the swinging of the propeller shaft 2 and the differential 5, and the generation of vibration and noise is suppressed.

  In the flexible shaft coupling 110 according to the present embodiment, the projecting member 12 is provided on the differential 5 as the driven side rotating shaft, and the hollow cylindrical member 13 is provided on the propeller shaft 2 as the driving side rotating shaft. However, the flexible shaft coupling according to the present invention may have other configurations. For example, the projecting member may be provided on the drive side rotation shaft, and the hollow cylindrical member may be provided on the driven side rotation shaft. In this case, the same operation as that of the flexible shaft coupling 110 can be obtained.

  Further, in the flexible shaft coupling 110 according to the present embodiment, the case where the outer shape of the coupling member 111 and the through hole 111k are formed in a hexagonal shape has been described. However, in the flexible shaft coupling according to the present invention, other shapes are used. You may make it form in. For example, the outer shape and the through hole of the coupling member may be formed in a circular shape.

  Further, in the flexible shaft coupling 110 according to the present embodiment, the drive side hollow collars 14a, 14b, 14c connected to the propeller shaft 2 are configured to be slidable, and the driven side collar 115a connected to the differential 5 is provided. 115 b and 115 c are configured to be fixed to the coupling member 111. However, the flexible shaft coupling according to the present invention may have other configurations. For example, the driving side hollow collar connected to the propeller shaft 2 may be fixed to the coupling member, and the driven side hollow collar connected to the differential 5 may be slid in the coupling member.

  As described above, the flexible shaft coupling according to the present invention is a flexible shaft that can obtain high centering accuracy between the drive-side rotary shaft and the driven-side rotary shaft and can suppress generation of vibration and noise. The effect of being able to provide a joint is effective, and is useful not only for vehicles but also for flexible shaft joints that are applied to industrial equipment such as machine tools and measuring equipment.

It is a side view of the propeller shaft which mounted | wore with the flexible shaft coupling which concerns on the 1st Embodiment of this invention. It is the disassembled perspective view which decomposed | disassembled a part of flexible shaft coupling and propeller shaft which concern on the 1st Embodiment of this invention. It is sectional drawing which shows the cross section of a part of flexible shaft coupling and propeller shaft which concern on the 1st Embodiment of this invention. FIG. 4 is a partial enlarged cross-sectional view in which a part of FIG. 3 is enlarged. (A) is the fragmentary sectional view which cut | disconnected some hollow collars of the flexible shaft coupling which concerns on the 1st Embodiment of this invention, (b) was seen from the A arrow direction of (a). It is a side view of a hollow collar. It is sectional drawing of the coupling member of the flexible shaft coupling which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the AA cross section of FIG. It is sectional drawing of the flexible shaft coupling which concerns on the 1st Embodiment of this invention, and shows the state which the propeller shaft and the differential inclined. It is a side view of the propeller shaft which mounted | wore with the flexible shaft coupling which concerns on the 2nd Embodiment of this invention. It is the disassembled perspective view which decomposed | disassembled a part of flexible shaft coupling and propeller shaft which concern on the 2nd Embodiment of this invention. It is sectional drawing which shows the cross section of a part of flexible shaft coupling and propeller shaft which concern on the 2nd Embodiment of this invention. It is sectional drawing of the coupling member of the flexible shaft coupling which concerns on the 2nd Embodiment of this invention. It is a side view of the coupling member of the flexible shaft coupling which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the flexible shaft coupling which concerns on the 2nd Embodiment of this invention, and shows the state which the differential inclined.

Explanation of symbols

1, 2, 3, 100 Propeller shaft 4 Universal joint 5 Differential 6 Output shaft 10, 10a, 110, 110a Flexible shaft coupling 11, 111 Coupling member 11k, 22ak Through hole 12 Protruding member 12k Spherical body 12t Protruding portion 13 Hollow cylindrical shape Member 13c Hollow cylindrical part 13h, 13k Through hole 13s Support body 14, 14a, 14b, 14c Drive side hollow collar (hollow collar)
14ab Bolt insertion hole 14af Flange 14ak Spherical part 15, 15a, 15b, 15c Driven side hollow collar (hollow collar)
16 Driving side yoke 17 Driven side yoke 21, 121 Coupling body (coupling member)
22a, 22b, 22c Drive side color guide (coupling member)
22an inner peripheral part 22g outer side curved surface 22n inner side curved surface 23a, 23b, 23c driven side color guide (coupling member)
115, 115a, 115b, 115c Driven side collar

Claims (5)

An annular coupling member that is made of an elastic material and that couples a driving side rotating shaft and a driven side rotating shaft to transmit power from the driving side rotating shaft to the driven side rotating shaft;
A projecting member projecting outward in the axial direction from either one of the driving side rotating shaft or the driven side rotating shaft;
Projecting outward in the axial direction from either the drive-side rotary shaft or the driven-side rotary shaft, the outer peripheral portion of the projecting member is fitted so that the axis of the drive-side rotary shaft and the driven-side rotary shaft are aligned. A hollow cylindrical member to be joined;
A hollow collar inserted into a through hole provided at a predetermined interval in the circumferential direction of the coupling member;
A bolt is inserted into the yoke and the hollow collar provided on the drive side rotary shaft and the driven side rotary shaft so that the drive side rotary shaft and the driven side rotary shaft are fastened to the coupling member. A flexible shaft coupling,
A sphere is provided at the tip of the protruding member, and a support that supports the outer periphery of the sphere is provided at the tip of the hollow cylindrical member.
A first curved surface that is curved in the same direction along the axial direction of the drive-side rotary shaft and the driven-side rotary shaft is formed on the inner peripheral portion of the coupling member that surrounds the through hole, and the hollow collar A flexible shaft coupling is characterized in that a second curved surface that fits to the first curved surface is formed on an outer peripheral portion, and the hollow collar can slide along the first curved surface.   The second curved surface is a spherical surface having a radius Rk with the central axis of the hollow collar as a center, and the distance connecting the center of the spherical surface and the center of the sphere provided at the tip of the protruding member Where L is a radius of curvature of the first curved surface radially outward of the coupling member, and L is a radius of curvature of the first curved surface radially inward of the coupling member. The flexible shaft coupling according to claim 1, wherein -Rk is used.   The flexible shaft coupling according to claim 1, wherein a cross section of the through hole is a circular cross section having a radius Rk.   The flexible shaft coupling according to claim 1 or 2, wherein the hollow collar is made of a material harder than an elastic material constituting the coupling member.   The flexible shaft coupling according to claim 1, wherein a lubricant is applied to the support body provided at a distal end portion of the hollow cylindrical member.

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