JP2010025282A - Elastic coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic coupling capable of suppressing fluctuation of the axis while achieving reduction in weight. <P>SOLUTION: The rubber thickness L10 of a fourth elastic body 44 is set larger than a difference between a winding part clearance L3 and an extending part one L4, so that a thinned part 50 described later can be set small and the outer line of the elastic coupling 1 can be made to get close to an circumscribed circle m1 of the elastomer, in comparison with a case where the rubber thickness L10 of the fourth elastic body 44 is set smaller than the difference between L3 and L4. Even in this case, the thinned part 50 is provided between the elastic body 40 and the circumscribed circle m1 of the elastomer, so that the weight of the elastic body 40 (the elastic coupling 1) can be reduced and transmission performance of the rotating torque of the elastic coupling 1 can be stabilized, in comparison with a case where the elastic body 40 (the elastic coupling 1) is formed in a perfect circle shape. Therefore, the output at the time when the rotating torque is transmitted from a drive shaft to a driven one can be improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an elastic joint, and more particularly, to an elastic joint that can suppress shake of the shaft center while reducing the weight.

  In a power transmission portion such as a drive shaft and a propeller shaft of an automobile, an elastic joint having a vibration damping function is used as a coupling for transmitting rotational torque from a drive shaft to a driven shaft.

  A conventional elastic joint is disclosed in Patent Document 1. Such an elastic joint has a plurality of drive-side collars connected to the drive shaft and driven-side collars connected to the driven shaft arranged alternately on a concentric circle, and is synthesized between adjacent collars. An endless fiber cord bundle made of a cord such as fiber yarn is wound, and each of the collars and the fiber cord bundle is embedded in an elastic body such as rubber or synthetic resin. Therefore, power (torque) can be transmitted while absorbing vibration between the drive side collar (drive shaft) and the driven side collar (driven shaft).

The elastic body is provided with a plurality of punched portions for the purpose of reducing the weight, increasing the free length, improving the cooling effect, and the like. A plurality (six) of meat stealing portions, which are gaps, are provided between the circumscribed circle circumscribing the body and the elastic body, and are configured in a hexagonal shape as a whole.
JP 2003-120712 A

  However, in the above-described conventional elastic joint, the elastic joint is formed in a hexagonal shape by the meat stealing portion, that is, formed in a non-circular shape, so that it is elastic with respect to the axis of the drive shaft and the driven shaft during rotation. There was a problem that the shaft center of the joint was easily shaken. On the other hand, if the outer shape of the elastic joint is made into a perfect circle without providing a stealing portion in the elastic joint, the above-described problem is solved, but there is a problem that the mass of the elastic body increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elastic joint capable of suppressing the shake of the shaft center while reducing the weight.

  In order to achieve this object, the elastic coupling according to claim 1 is connected to the driven shaft by a plurality of driving side connecting elements connected to the driving shaft and alternately arranged concentrically with the driving side connecting elements. A plurality of driven side connection elements, a plurality of endless fiber cord bundles formed by winding fiber cords around the drive side connection elements and the driven side connection elements provided adjacently, and the plurality of fiber cord bundles, An elastic body in which the plurality of drive side connection elements and the plurality of driven side connection elements are buried and formed in a polygonal shape when viewed from the axial direction of the drive side connection element or the driven side connection element; and the drive Provided between the elastic body circumscribed circle and the elastic body when an elastic body circumscribed circle that is a virtual circle circumscribing the elastic body as viewed from the axial direction of the side connection element or the driven side connection element is set Meat theft The elastic body includes an outer peripheral side elastic portion provided along an outer peripheral surface of the endless fiber cord bundle and disposed on the meat stealing portion side, and the elastic body circumscribed circle And when the cord circumscribing circle is set, which is a virtual circle circumscribing the plurality of endless fiber cord bundles as viewed from the axial direction of the driving side connecting element or the driven side connecting element, The difference between the radius of the cord circumscribing circle and the shortest distance from the outer center of the cord circumscribing circle to the outer peripheral surface of the fiber cord bundle on the meat stealing portion side is set smaller than the maximum thickness of the outer peripheral elastic portion. .

  The elastic joint according to claim 2 is the elastic joint according to claim 1, wherein the elastic body includes the drive side connection element or the driven side connection between the drive side connection element and the driven side connection element provided adjacent to each other. A punched portion which is a hole drilled in the axial direction of the element is provided, and the width in the radial direction of the meat stealing portion is set smaller than the width in the circumferential direction of the punched portion.

  The elastic joint according to claim 3 is the elastic joint according to claim 2, wherein the distance between the axis of the driving side connecting element and the axis of the driven side connecting element that are provided next is the cord circumscribed circle. The distance from the outer center to the axis of the drive side connection element or the driven side connection element is set to be shorter than the distance.

  According to a fourth aspect of the present invention, in the elastic joint according to the third aspect, the drive side connection element and the driven side connection element are arranged in four each, and the axis of the drive side connection element is adjacent to the elastic joint. And the spaced-apart distance between the driven-side connecting element and the axis of the driven-side connecting element are set at equal intervals.

  According to the elastic joint of claim 1, the drive side connecting element connected to the drive shaft and the driven side connecting element connected to the driven shaft are coupled via the fiber cord bundle, so that the drive shaft and the driven shaft are connected. Power (torque) is transmitted from the drive shaft to the driven shaft while absorbing vibration. In this case, vibration and torsion (bending) generated between the drive shaft and the driven shaft are absorbed by elastic deformation of the elastic body and the fiber cord bundle embedded in the elastic body, thereby improving the riding comfort. I am trying. Also, by providing a meat stealing portion that is a gap between the elastic body circumscribed circle and the elastic body, which is a virtual circle that circumscribes the elastic body as viewed from the axial direction of the driving side connection element or the driven side connection element, The weight is reduced.

  Here, according to the elastic joint of claim 1, it is concentric with the circumscribed circle of the elastic body and circumscribes the plurality of endless fiber cord bundles as viewed from the axial direction of the drive side connection element or the driven side connection element. When a cord circumscribing circle, which is a virtual circle, is set, the difference between the radius of the cord circumscribing circle and the shortest distance from the outer circumference of the cord circumscribing circle to the outer peripheral surface of the fiber cord bundle on the meat stealer side is the meat stealing Since the thickness is set to be smaller than the maximum thickness of the outer peripheral elastic portion disposed on the outer peripheral surface of the fiber cord bundle on the part side, there is an effect that it is possible to suppress the shake of the shaft center while reducing the weight.

  That is, the difference between the radius of the cord circumscribing circle and the shortest distance from the outer center of the cord circumscribing circle to the outer peripheral surface of the fiber cord bundle on the meat stealer portion side is arranged on the outer peripheral surface of the fiber cord bundle on the meat stealer portion side. Since it is set smaller than the maximum thickness of the outer peripheral elastic part, the difference can be set smaller than the maximum thickness of the outer peripheral elastic part. Can be approximated to an elastic body circumcircle (circular shape).

  Therefore, since the fluctuation of the shaft center of the elastic joint can be reduced during the rotation of the elastic joint, the vibration generated between the drive shaft and the driven shaft can be suppressed, and the rotational torque transmission performance of the elastic joint can be suppressed. There is an effect that can be stabilized. Therefore, it is possible to improve the output when the rotational torque is transmitted from the drive shaft to the driven shaft.

  Even in this case, since the meat stealing portion is provided between the elastic body and the circumscribed circle of the elastic body, the weight of the elastic body is reduced compared to the case where the elastic body is formed in a perfect circle shape. There is an effect that can be achieved.

  In addition, since the difference between the radius of the cord circumscribing circle and the shortest distance from the outer center of the cord circumscribing circle to the outer peripheral surface of the fiber cord bundle on the meat stealer side is set smaller than the maximum thickness of the outer peripheral elastic portion, Compared with the case where the difference is set to be larger than the maximum thickness of the outer peripheral elastic body, the distance between the adjacent drive side connection element and the driven side connection element is set to be short. Therefore, there is an effect that the durability of the elastic joint can be improved.

  That is, since the separation distance between the adjacent drive side connection element and the driven side connection element is set short, when the same torque is applied, the adjacent drive side connection element and the driven side connection element The extension of the fiber cord bundle wound between them can be suppressed, and the breakage of the fiber cord can be prevented even when a high output is loaded on the fiber cord. Therefore, there is an effect that the durability of the elastic joint can be improved.

  According to the elastic joint according to claim 2, in addition to the effect produced by the elastic joint according to claim 1, the width in the radial direction of the meat stealing portion is set smaller than the width in the circumferential direction of the hole punching portion. Even when the weight of the elastic body is reduced by the meat stealing portion, the elastic body can be made close to a perfect circle. As a result, the meat stealing portion can be set to a size that does not cause vibration in the shaft center of the elastic joint, and the torque transmission performance of the elastic joint can be improved while reducing the weight of the elastic body. .

  In addition, since the width in the circumferential direction of the punched portion is set to be larger than the width in the radial direction of the meat stealing portion, it is closer to the shaft center than the meat stealing portion side of the elastic joint, on the inner peripheral side of the fiber cord that becomes high The heat dissipation of the elastic body to be arranged can be improved and the weight can be reduced.

  According to the elastic joint of the third aspect, in addition to the effect produced by the elastic joint according to the second aspect, the separation distance between the axis of the drive side connecting element and the axis of the driven side connecting element provided adjacently is The distance between the outer circumference of the cord circumscribing circle and the axis of the drive side connection element or the driven side connection element is set shorter than the distance between the axis of the driven side connection element and the axis of the drive side connection element. There is an effect that the durability of the elastic joint can be improved as compared with the case where the distance is set longer than the separation distance from the outer center of the cord circumscribing circle to the axis of the drive side connection element or the driven side connection element.

  That is, when the same torque is applied, the extension of the fiber cord bundle wound between the adjacent drive side connection element and the driven side connection element can be suppressed, and a high output is applied to the fiber cord. Even in this case, the fiber cord can be prevented from being broken. Therefore, there is an effect that the durability of the elastic joint can be improved.

  According to the elastic joint of the fourth aspect, in addition to the effect produced by the elastic joint according to the third aspect, four drive side connection elements and four driven side connection elements are arranged, respectively, and the drive side connection is provided adjacent to each other. Since the separation distance between the axis of the element and the axis of the driven-side connection element is set at an equal interval, the drive shaft and the driven shaft are provided at four locations on the top, bottom, left and right respectively. Can do.

  Therefore, when the drive side connection element and the driven side connection element are loaded with torque from the drive shaft or the driven shaft, the fiber cords that are vibration absorbing portions and the periphery of the fiber cords are arranged in four places, upper, lower, left, and right. Since the rubber part can be arranged, the fiber cord and elastic body can be elastically deformed regardless of the direction of vibration and torsion (bending) between the drive shaft and the driven shaft. There is an effect that the vibration damping function of the joint can be improved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an elastic joint 1 according to an embodiment of the present invention. FIG. 1 (a) is a front view of the elastic joint 1, and FIG. 1 (b) is an illustration of I (b) in FIG. It is a side view of the elastic coupling 1 seen from the direction. 2 is a cross-sectional view of the elastic joint 1 taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view of the elastic joint 1 taken along line III-III in FIG. In FIG. 1, the fiber cord bundle 30 is indicated by a broken line. In FIG. 1 to FIG. 3, the same parts are denoted by reference numerals, and the other reference numerals are omitted. In addition, the code | symbol is abbreviate | omitted similarly to FIGS.

  As shown in FIG. 1, the elastic joint 1 is connected to a drive shaft (not shown) corresponding to an output shaft or the like on the engine side, and a plurality of drive side collars 10 arranged in a circle around the axis O1. The drive-side collars 10 are alternately arranged concentrically with a plurality of driven-side collars 20 connected to a driven shaft (not shown) corresponding to a drive shaft and the like, and adjacent drive-side collars 10 and driven-side collars. A plurality of endless fiber cord bundles 30 wound around the collar 20, an elastic body 40 in which the plurality of fiber cord bundles 30, a plurality of driving side collars 10 and a plurality of driven side collars 20 are embedded, and an elastic body 40 Is provided with a through hole 40a drilled in the center.

  As shown in FIGS. 1 to 3, the driving side collar 10 is integrally formed of a relatively light metal material such as aluminum or an alloy thereof such as aluminum or its alloy by using a casting means such as die cast. Further, the driving side collar 10 includes a cylindrical tube portion 11 having O2 as an axis, and a flange portion projecting in the axial diameter direction (the vertical direction in FIGS. 2 and 3) from the outer peripheral surface of the tube portion 11. 12.

  As shown in FIGS. 2 and 3, the cylindrical portion 11 is provided with an inner peripheral hole 11a penetrating in the axial direction (vertical direction in FIGS. 2 and 3) of the axis O2 (see FIG. 1). The inner cylinder member 10a to be pressed is press-fitted. In addition, both end portions (end portions in the vertical direction in FIGS. 2 and 3) of the cylindrical portion 11 are set to have a thickness (length in the left-right direction in FIGS. 2 and 3) larger than that of the central portion of the cylindrical portion 11. Has been. Therefore, the rigidity of the both ends of the cylinder part 11 can be improved.

  As shown in FIGS. 1 to 3, the flange portion 12 protrudes from the outer peripheral surface of the driving side collar 10 to the outside in the radial direction (left and right directions in FIGS. 2 and 3) and is viewed from the direction of the axis O <b> 2 (FIG. It is formed in a donut shape (viewed from the front of the sheet of paper) and viewed from the direction orthogonal to the axis O2 (viewed from the front of the sheet of FIG. 2), with respect to the outer peripheral end (the cylindrical portion 11 and the flange portion 12). Are formed in a tapered shape so that the thickness of the flange portion 12 (the length in the vertical direction in FIGS. 2 and 3) gradually increases toward the connection portion. Therefore, sufficient strength of the flange portion 12 can be secured against a relatively large load generated at the time of starting or the like, and the durability of the driving side collar 10 can be improved.

  Further, the thickness of the base portion of the flange portion 12 is set to be smaller than the minimum thickness of the driving side collar 10. Therefore, it is possible to secure a space for winding the fiber cord of the fiber cord bundle 30 between the first to fourth flange portions 12a to 12d described later.

  Further, the flange portion 12 includes four flange portions 12a to 12d formed in the same shape. That is, the first flange portion 12a, the second flange portion 12b, the third flange portion 12c, and the fourth flange portion 12d are disposed in order from the front side (upper side in FIGS. 2 and 3). In addition, the separation distance between the second flange portion 12b and the third flange portion 12c facing each other on the center side is the separation distance (third flange between the first flange portion 12a and the second flange portion 12 facing each other on both ends. Is set to be longer than the separation distance between the portion 12c and the fourth flange portion 12d.

  Between a pair of opposing flange portions 12, that is, between the first flange portion 12a and the second flange portion 12, between the second flange portion 12b and the third flange portion 12c, and between the third flange portion 12c and the second flange portion 12c. The fiber cord 101 (refer FIG. 9) which comprises the fiber cord bundle 30 is wound around each outer peripheral surface between 4 flange parts 12d.

  As shown in FIGS. 1 to 3, the inner cylinder member 10 a is a cylinder member formed in a cylindrical shape from a metal such as iron, and is press-fitted into the drive-side collar 10 in an interference fit state. The inner cylinder member 10a improves the rigidity of the driving side collar 10.

A bolt (not shown) fixed to the end of a drive shaft (not shown) is inserted into the inner peripheral hole of the inner cylinder member 10a, and the bolt is fastened to the end surface of the inner cylinder member 10a. Therefore, the drive shaft and the elastic joint 1 are connected via this bolt. The inner cylinder member 10a has an end portion on the side connected to a drive shaft or a driven shaft (both not shown) protruding in the direction of the axis O2 from an end surface of the elastic body 40 described later.

  As shown in FIGS. 2 and 3, the thickness of the inner cylinder member 10 a (the thickness in the left-right direction in FIGS. 2 and 3) is set to be thicker than the maximum thickness of the driving side collar 10. Therefore, the end surface of the inner cylinder member 10a can be used as the seating surface of the bolt (not shown) described above.

  Since the driving side collar 10 and the driven side collar 20 are formed in the same shape, the description of the driven side collar 20 is omitted. Further, the cylindrical portion 21 corresponds to the cylindrical portion 11, the flange portion 22 corresponds to the flange portion 12, and the first flange portion 12a to the fourth flange portion 12d correspond to the first flange portion 22a to the fourth flange portion 22d. The inner cylinder member 10a corresponds to the inner cylinder member 20a, and the axis O2 corresponds to the axis O3.

  As shown in FIG. 1, four each of the driving side collars 10 and the driven side collars 20 are alternately arranged at equal intervals on a concentric circle of the axis O1. Therefore, the separation distance L1 (the separation distance between the shaft centers O2 and O3) between the adjacent drive side collar 10 and the driven side collar 20 is set to be the same, and the axis O1 of the elastic joint 1 and the drive side collar 10 are separated. Each separation distance L2 from the axis O2 (the axis O3 of the driven collar 20) is also set to be the same, and the separation distance L1 is set to be shorter than the separation distance L2.

  Therefore, compared with the case where the separation distance L1 is set to be longer than the separation distance L2, it is possible to suppress the extension of a fiber cord bundle 30 to be described later that is wound between the driving side collar 10 and the driven side collar 20 that are adjacent to each other, The durability of the elastic joint 1 can be improved.

  Further, as shown in FIGS. 1 to 3, a fiber cord made of synthetic fiber such as polyester fiber is wound in a multilayered manner in a loop between adjacent drive side collar 10 and driven side collar 20. An endless fiber cord bundle 30 for reinforcement formed by this is wound.

  The fiber cord bundle 30 is a member that transmits the rotation of the driving side collar 10 to the driven side collar 20. The fiber cord bundle 30 is rotated by the rotation of the driving side collar 10, and is driven by the fiber cord bundle 30. The side collar 20 is rotated. Thereby, torque can be transmitted from the drive shaft (not shown) side to the driven shaft (not shown) side.

  As shown in FIG. 1, the fiber cord bundle 30 is a drive side fiber cord bundle wound around each drive side collar 10 and a driven side collar 20 on the rear side in the rotation direction Z when the elastic joint 1 is driven. 31, each driving side collar 10, and a pair of driven side fiber cord bundles 32 wound around the front side driven side collar 20 in the rotation direction Z when the elastic joint 1 is driven. Yes.

  Usually, at the start of driving due to vehicle start-up or normal driving rotation, a large tensile force is exerted between each driving side collar 10 and the driven side collar 20 on the rear side in the rotation direction, that is, on the driving side fiber cord bundle 31. Works. Therefore, as described above, the separation distance between the second flange portion 12b and the third flange portion 12c around which the drive side fiber cord bundle 31 is wound is the first flange portion around which the driven side fiber cord bundle 32 is wound. 12a and the 2nd flange part 12b (the 3rd flange part 12c and the 4th flange part 12d) are set longer than the separation distance. As a result, the number of cords of the drive side fiber cord bundle 31, that is, the cross-sectional area of the entire cord bundle in the direction of the axis O1 (the vertical direction in FIGS. 2 and 2) is the number of cords of the driven side fiber cord bundle 32, that is, the axis of the whole cord bundle. It is set larger than the cross-sectional area in the O1 direction.

  That is, as shown in FIGS. 2 and 3, the driving side fiber cord bundle 31 is in the center of the driving side collar 10 and the driven side collar 20, and the driven side fiber cord bundle 32 is in the driving side collar 10 and the driven side collar. The two ends of 20 are respectively wound around the flange portions 12a to 12d.

  As shown in FIGS. 1 to 3, the drive side fiber cord bundle 31 is wound around the drive side collar 10 and is configured as a semicircular shape when viewed from the axial center O1 direction (front side in FIG. 1). A hanging portion 31a, a linearly extending portion 31b spanning the adjacent driving side collar 10 and driven side collar 20, and a semicircular shape wound around the driven side collar 20 as viewed from the axial center O1 direction. The driven side winding part 31c is provided.

  As shown in FIG. 1, the winding part separation distance L3 from the axis O1 of the elastic joint 1 to the outer edge of the driving side winding part 31a (driven side winding part 31c) (from the axis O1 of the elastic joint 1 to the driving side) The longest separation distance to the fiber cord bundle 31) is set to 76.5 mm, and the extension portion separation from the axial center O1 of the elastic joint 1 to the extension portion 31b on the side of the meat stealing portion 50 (see FIG. 4) described later. The distance L4 (the shortest separation distance from the axis O1 of the elastic joint 1 to the drive side fiber cord bundle 31) is set to 72 mm.

  Therefore, the difference between the winding portion separation distance L3 and the extension portion separation distance L4 is set to 4.5 mm, which is smaller than the winding thickness L5 (6 mm) of the drive side fiber cord bundle 31. Therefore, compared with the case where the difference between the winding portion separation distance L3 and the extension portion separation distance L4 is set larger than the winding thickness L5 (6 mm) of the driving side fiber cord bundle 31, the extension of the driving side fiber cord bundle 31 is increased. The winding direction of the installation portion 31b can be made closer to a virtual cord circumscribing circle m2 (see FIG. 4) in which the plurality of driving side fiber cord bundles 31 and the driven side fiber cord bundles 32 circumscribe when viewed from the direction of the axis O1. it can. Accordingly, the outer shape lines of the plurality of driving side fiber cord bundles 31 and the driven side fiber cord bundles 32 can be brought close to the cord circumscribed circle m2 (perfect circle shape).

  Since the drive side fiber cord bundle 31 and the driven side fiber cord bundle 32 are configured in the same manner except for the cross-sectional area described above, detailed description of the driven side fiber cord bundle 32 is omitted. The drive side winding portion 31a corresponds to the drive side winding portion 32a, the extension portion 31b corresponds to the extension portion 32b, and the driven side winding portion 31c corresponds to the driven side winding portion 32c.

  As shown in FIG. 1, the elastic body 40 is a rubber member formed in an octagonal shape as viewed from the direction of the axis O1 (the front side of FIG. 1). A hole 40b is formed between the side collar 10 and each driven collar 20, and all the holes 40b are formed in the same shape. A specific configuration of the elastic body 40 will be described in detail later with reference to FIGS.

  As shown in FIGS. 2 and 3, the punched portion 40b is continuous with the tapered portion 40A provided on the rear surface (upper surface of FIGS. 2 and 3), and the thickness direction of the elastic joint 1 (vertical direction of FIGS. 2 and 3). 1), as shown in FIG. 1, the front side (the lower side of FIGS. 2 and 3) of the punched portion 40b is closed by the thin film 40c, and the punched portion 40b is , And an opening width L6 (dimension in the circumferential direction of a circle centered on the axis O1 of the elastic joint 1).

  The spring constant of the elastic body 40 (a first elastic body 41 and a second elastic body 42, which will be described later, see FIG. 4) can be set small by the punched portion 40b. Accordingly, the elastic body 40 is more easily elastically deformed than the case where the hole punching portion 40b is not provided, and therefore vibration generated between the driving side collar 10 (driving shaft) and the driven side collar 20 (driven shaft) and Torsion (deflection) and the like can be absorbed.

  Moreover, the free length of the surface with respect to the elastic deformation of the elastic body 40 (the 1st elastic body 41 and the 2nd elastic body 42 mentioned later) can be earned. Furthermore, the cooling effect can be improved against heat generated by the friction of the fiber cord 101 (see FIG. 9) constituting the fiber cord bundle 30 as the fiber cord bundle 30 rotates. Therefore, the fiber cords of the fiber cord bundle 30 can be prevented from being broken, and the durability thereof can be improved.

  Further, the opening area of the punched portion 40b is gradually reduced as it approaches the thin film 40c. That is, the opening width L6 of the punched portion 40b is set to 4 mm at the maximum on the taper portion 40A side and set to 2.5 mm at the minimum on the thin film 40c side.

  Therefore, the opening width L6 of the punched portion 40b is set smaller than the winding thickness L5 (6 mm) of the driving side fiber cord bundle 31. Therefore, compared with the case where the opening width L6 of the punched portion 40b is set larger than the winding thickness L5 of the drive side fiber cord bundle 31, the volume of the space portion of the punched portion 40b can be reduced. Therefore, it is possible to secure the rubber amount of the elastic body 40 (first elastic body 41 and second elastic body 42 described later), a plurality of driving side collars 10, a plurality of driven side collars 20, and a plurality of driving sides. The fiber cord bundle 31 and the plurality of driven side fiber cord bundles 32 can be stably held by the elastic body 40 by the elastic body 40.

  Moreover, since the opening width L6 of the punched portion 40b is minimized on the thin film 40c side, the area of the thin film can be set to the smallest. Therefore, when the elastic body 40 (the 1st elastic body 41 and the 2nd elastic body 42 mentioned later) elastically deforms, the deformation amount of the thin film 40c can be suppressed and it can prevent that the crack generate | occur | produces in the thin film 40c. . The rubber thicknesses L7 and L8 (see FIG. 4) of the portion disposed between the punched portion 40b and the driving side fiber cord bundle 31 and the driven side fiber cord bundle 32 will be described in detail later with reference to FIG. explain.

  As shown in FIGS. 2 and 3, the front side (the lower side of FIGS. 2 and 3) of the punched portion 40b is closed with the thin film 40c, and the front side of the thin film 40c (the lower side of FIGS. 2 and 3). ) Is formed with a step 40e that is recessed by one step from the front surface of the elastic body 40. The rubber thickness of the thin film 40c is set to 1 mm.

  The elastic joint 1 is assembled to a drive shaft and a driven shaft (both not shown) with the thin film 40c facing the vehicle front side. By directing the thin film 40c toward the front of the vehicle, it is possible to prevent dirt such as wind and mud from entering the punched portion 40b. Therefore, it is possible to prevent the wind noise generated when the wind enters the punched portion 40b and the clogging of the punched portion 40b caused by the entry of dirt such as mud.

  Further, an identification mark 40d such as a convex portion formed integrally with the molding of the elastic body 40, for example, in the vicinity of the drive side collar 10 in the elastic body 40 is provided on one end side surface in the direction of the axis O1 same as the side having the thin film 40c. Is formed. The identification mark 40d is arranged in a position where the extension portion 31b on the side away from the axis O1 of the drive side fiber cord bundle 31 and a part thereof overlap in the direction of the axis O1 of the elastic joint 1.

  By the identification mark 40d, the driving side collar 10 and the driven side collar 20 formed in the same shape are connected to the driving side collar 10 connected to the driving shaft (not shown) and the driven shaft (not shown). The front side (FIG. 2 and FIG. 3 lower surface) and rear surface (FIG. 2 and FIG. 3 upper surface) of the elastic joint 1, that is, the side on which the thin film 40 c is formed. The other side can be easily identified.

  Therefore, when the elastic joint 1 is assembled to the drive shaft and the driven shaft (both not shown), the identification mark 40d is used as a mark, that is, depending on the presence or absence of the identification mark 40d, the driving side collar 10 or the driven side collar. 20 can be easily identified, and the front surface (lower surface of FIGS. 2 and 3) and the rear surface (upper surface of FIGS. 2 and 3) of the elastic joint 1 can be easily identified.

  Therefore, the bolt (not shown) fixed to the end of the drive shaft (not shown) on the drive side collar 10 (inner cylinder member 10a) with the thin film 40c facing the vehicle front side (right side in FIGS. 2 and 3). And the operation of attaching a bolt (not shown) fixed to the end portion of the driven shaft (not shown) can be easily performed.

  The identification mark 40d is preferably provided in the vicinity of all the driving side collars 10, but it may be provided in the vicinity of one driving side collar 10. In this case as well, the driving side collar 10 and the follower are driven. Since the side collars 20 are alternately arranged, the driving side collar 10 and the driven side collar 20 can be easily identified.

  Further, the identification mark 40d can be attached in the vicinity of the driving collar 10 by a processing means after the elastic body 40 is molded, but it is desirable to form the identification mark 40d at the same time as the elastic body 40 is molded.

  The identification mark 40d may be a concave portion in addition to the convex portion, and the shape is not limited to a circular shape as shown in the figure, and may be a square or a dot or a linear convex portion or concave portion. In practice, the convex portion formed integrally with the elastic body 40 in the vicinity of the driving side collar 10 and the driven side collar 20 does not affect the driving side fiber cord bundle 31 or the driven side fiber cord bundle 32 inside. It can be formed, and it can be easily confirmed visually, and can also be confirmed by touch.

  Next, the elastic body 40 will be described with reference to FIGS. 4 is an enlarged front view of the elastic joint 1 in the IV part of FIG. 1, FIG. 5 is a cross-sectional view of the elastic joint 1 taken along the line VV of FIG. 1B, and FIG. It is sectional drawing of the elastic joint 1 in the VI-VI line of (b). 7A is a cross-sectional view of the elastic joint 1 taken along line VIIa-VIIa in FIG. 4A, and FIG. 7B is an elastic joint 1 taken along line VIIb-VIIb in FIG. 4A. FIG. 8A is a cross-sectional view of the elastic joint 1 taken along line VIIIa-VIIIa in FIG. 4A, and FIG. 8B is an elastic joint 1 taken along line VIIIb-VIIIb in FIG. 4A. FIG.

  Further, in FIG. 6, the drive side fiber cord bundle 31 and the driven side fiber cord bundle 32 are illustrated by broken lines, and in FIGS. 4 to 6, the virtual side circumscribing the elastic body 40 as viewed from the direction of the axis O <b> 1 of the elastic joint 1. The elastic body circumscribed circle m1 is shown by a two-dot chain line, and in FIG. 4, a plurality of driving side fiber cord bundles 31 and driven side fiber cord bundles 32 are circumscribed as viewed from the direction of the axis O1 of the elastic joint 1. The cord circumscribed circle m2 is shown by a two-dot chain line.

  Further, in FIG. 6, the portion indicated by K1 in FIG. 6 is enlarged, and in FIG. 7A, the portion indicated by K2 in FIG. 7A is enlarged, and in FIG. 7B. 7 (b) is an enlarged view of a portion indicated by K3, FIG. 8 (a) is an enlarged view of a portion indicated by K4 of FIG. 8 (a), and FIG. The portion indicated by K5 in FIG. 8 (b) is enlarged.

  As shown in FIGS. 4 to 6, the elastic body 40 includes a plurality of driving side collars 10, a plurality of driven side collars 20, a plurality of driving side fiber cord bundles 31, and a plurality of driven side fiber cord bundles 32. It is an elastic member integrally formed with.

  That is, each driving side fiber cord bundle 31 with at least the inner peripheral hole of each driving side collar 10 (inner cylinder member 10a) and the inner peripheral hole of each driven side collar 20 (inner cylinder member 20a) exposed to the outside. And each driving side collar 10 and each driven side collar 20 around which each driven side fiber cord bundle 32 is wound are set in a molding die (not shown), and the molding die is filled with an elastic member (rubber material). Thus, the elastic body 40 is integrally vulcanized and molded with each driving side collar 10, each driven side collar 20, each driving side fiber cord bundle 31, and each driven side fiber cord bundle 32.

  As shown in FIGS. 5 and 6, the elastic body 40 is an octagon that is concentric with the axis O1 of the elastic joint 1 and penetrates in the direction of the axis O1 (from the front to the back in FIG. 5 and FIG. 6). Between the through hole 40a, which is a hole having a shape, and a virtual elastic body circumscribed circle m1 that circumscribes the elastic body 40 as viewed from the direction of the axis O1 of the elastic joint 1 and the elastic body 40 (fourth elastic body 44 described later). By providing eight meat stealing portions 50, which will be described later, which are gaps, they are formed in an octagonal donut shape when viewed from the axial center O1 of the elastic joint 1 (viewed from the front side of FIGS. 5 and 6). . The meat stealing unit 50 will be described in detail later.

  Further, as shown in FIGS. 5 and 6, the elastic body 40 includes a plurality of first elastic bodies 41 arranged between each driving side collar 10 and the driven side collar 20 on the rear side in the rotation direction Z. A plurality of second elastic bodies 42 arranged concentrically and alternately with the first elastic bodies 41 and between the driving side collars 10 and the driven side collars 20 on the front side in the rotation direction Z; And the third elastic bodies 43 arranged on the axis O1 side (inner peripheral side) of the plurality of first elastic bodies 41 and the plurality of second elastic bodies 43, which are alternately arranged in a concentric manner. A plurality of first elastic bodies 41 and a plurality of second elastic bodies 43, and a fourth elastic body 44 disposed on the side of the meat stealer 50.

  As shown in FIGS. 4 and 5, the first elastic body 41 is provided in the line of the drive side fiber cord bundle 31 in the axial center O1 direction of the elastic joint 1 (from the front side to the back side in FIG. 5). Except between the flange portions 12a, 22a and the second flange portions 12b, 22b and between the third flange portions 12c, 22c and the fourth flange portions 12d, 12d (see FIG. 7B), the driving side collar 10 Is a rubber member disposed between the outer periphery of the cylindrical portion 11 and the outer periphery of the cylindrical portion 21 of the driven side collar 20 on the rear side in the rotational direction thereof, and is described above at the center between the driving side collar 10 and the driven side collar 20. A perforated portion 40b is formed.

  Moreover, as shown in FIG.4 and FIG.7 (a), rubber | gum thickness L7a of the 1st elastic body 41 between the punching part 40b and the extension part 31b of the drive side fiber cord bundle 31 (FIG. 7 (a)). The dimension in the left-right direction) is set so as to increase gradually in the direction in which the hole 40b is drilled (from the top to the bottom in FIG. 7A), and the opening side (the front side in FIG. 4 and FIG. 7A). ) Upper side) is set to a minimum of 4 mm, and the thin film 40c side (the back side of FIG. 4, the lower side of FIG. 7A) is set to a maximum of 4.5 mm.

  Furthermore, as shown in FIG.4 and FIG.7 (b), the 1st arrange | positioned between the punching part 40b and the drive side winding part 32a (driven side winding part 32c) of the driven side fiber cord bundle 32 is shown. The rubber thickness L8a of the elastic body 41 (the dimension in the left-right direction in FIG. 7B) is set so as to gradually increase in the direction in which the hole 40b is drilled (from the top to the bottom in FIG. 7B). The portion side (front side of FIG. 4 and upper side of FIG. 7B) is set to a minimum of 3 mm, and the thin film 40c side (back side of FIG. 4 and upper side of FIG. 7B) is set to a maximum of 4.3 mm. ing.

  As shown in FIGS. 4 and 6, the second elastic body 42 is provided in the line of the driven side fiber cord bundle 32 in the direction of the axis O1 of the elastic joint 1 (from the front side to the back side in FIG. 5). Except between the flange portions 12b and 22b and the third flange portions 12c and 22c (see FIG. 8B), the outer side of the cylinder portion 11 of the driving side collar 10 and the driven side collar 20 on the front side in the rotational direction thereof. This is a rubber member disposed between the outer periphery of the cylindrical portion 21, and the aforementioned punched portion 40 b is formed in the center between the driving side collar 10 and the driven side collar 20.

  Moreover, as shown in FIG.4 and FIG.8 (a), rubber | gum thickness L7b (FIG. 8) of the 2nd elastic body 42 arrange | positioned between the punching part 40b and the extension part 32b of the driven side fiber cord bundle 32 is shown. (A) the dimension in the left-right direction) is set so as to gradually increase in the drilling direction of the punched portion 40b (from the top to the bottom in FIG. 8A), and the opening side (the front side in FIG. 4) 7 (a) upper side) is set to a minimum of 3.8 mm, and the thin film 40c side (the back side in FIG. 4, the lower side of FIG. 7 (a)) is set to a maximum of 4.8 mm.

  Furthermore, as shown in FIG.4 and FIG.8 (b), the 2nd arrange | positioned between the punching part 40b and the drive side winding part 31a (driven side winding part 31c) of the drive side fiber cord bundle 31 is carried out. The rubber thickness L8b of the elastic body 42 (dimension in the left-right direction in FIG. 7B) is set so as to gradually increase in the direction in which the hole 40b is drilled (from the top to the bottom in FIG. 7B). The portion side (front side in FIG. 4 and the upper side in FIG. 7B) is set to a minimum of 3.5 mm, and the thin film 40c side (back side in FIG. 4 and the upper side in FIG. 7B) is set to a maximum of 4 mm. ing.

  Therefore, the elastic body 40 is provided with the above-described hole punching portion 40b, so that the hole punching portion 40b and the driving side winding portion 31a or the driven side winding portion 31c (the driving side winding portion 32a or the driven side winding portion 32c). The rubber thickness L8 (L8a and L8b) disposed between the holed portion 40b and the extended portion 31b (extended portion 32b) in the cross section in the direction orthogonal to the axial centers O2 and O3. The thickness is set smaller than L7 (L7a and L7b).

  Therefore, the driving side fiber cord bundle 31 and the driven side fibers are set while setting the spring constant of the elastic body 40 (the first elastic body 41 or the second elastic body 42) smaller than when the hole punching portion 40b is not provided. The drive side fiber cord bundle 31 and the driven side fiber cord bundle 32 are determined from the rubber thicknesses of the rubber portions disposed on the drive side winding portions 31a and 32a and the driven side winding portions 31c and 32c, which are non-flexing portions of the cord bundle 32. It is possible to set the rubber thickness of the rubber portion disposed in the extending portions 31b and 32b, which are the bent portions, to be thick.

  Therefore, when the rotational torque is transmitted from the drive shaft (not shown) to the driven shaft (not shown) by the drive side fiber cord bundle 31 and the driven side fiber cord bundle 32, the extending portions 31b and 32b and this portion are transmitted. The rubber part provided along can be easily elastically deformed. As a result, when a rotational torque is transmitted from a drive shaft (not shown) to a driven shaft (not shown), its elasticity against vibration and torsion (deflection) generated between the drive shaft and the driven shaft. The vibration damping function of the elastic joint 1 can be improved by the deformation. Therefore, the riding comfort can be improved.

  In addition, the first elastic body 41 and the second elastic body 42 are subject to frictional heat due to the rotation of the driving side fiber cord bundle 31 and the driven side fiber cord bundle 32 therein, so that they tend to be hotter than other portions. . On the other hand, the 1st elastic body 41 and the 2nd elastic body 42 are cooled by ensuring the thermal radiation area of the 1st elastic body 41 and the 2nd elastic body 42 by the punching part 40b.

  Further, when the holed portion 40b is provided, since the rubber thickness L8 is set to be thinner than the rubber thickness L7, it comes into contact with the cylindrical portion 11 of the driving side collar 10 and the cylindrical portion 21 of the driven side collar 20. It is possible to improve the heat dissipation of the portion that easily generates heat (the hole punching portion 40b and the driving side winding portions 31a and 32a (the rubber portion between the driven side winding portions 31c and 32c). 41 and the 2nd elastic body 42 can be prevented from thermal degradation, and the durability of the 1st elastic body 41 and the 2nd elastic body 42 (elastic joint 1) can be improved.

  As shown in FIGS. 5 to 8, the third elastic body 43 is a rubber member disposed on the inner circumferences of the first elastic body 41 and the second elastic body 42 and viewed from the direction of the axis O <b> 1 of the elastic joint 1. It is formed in an octagonal ring shape.

  The rubber thickness L9 of the third elastic body 43 (the dimensions in the left-right direction in FIGS. 7A and 8A) is set to the same width of 6 mm in the circumferential direction along the inner edge of the through hole 40a. And extending in the drilling direction of the punched portion 40b (the vertical direction in FIGS. 7A and 8A).

  That is, as shown in FIGS. 4, 5, and 6, the portion provided along the extending portion 31 b of the drive side fiber cord bundle 31 of the third elastic body 43 has a substantially same rubber thickness L <b> 9 in the circumferential direction. It is extended to. Further, the portion provided along the extended portion 32b of the driven side fiber cord bundle 32 of the third elastic body 43 is also extended in the circumferential direction with substantially the same rubber thickness L9.

  Therefore, the shake of the axial center O1 of the elastic joint 1 can be reduced, and the rotational torque transmission performance of the elastic joint 1 can be stabilized. Therefore, when the rotational torque is transmitted from the drive shaft (not shown) to the driven shaft (not shown), the output can be improved.

  Further, since the rubber thickness L9 of the third elastic body 43 is set to be the same as the winding thickness L5 (5 mm) of the driving side fiber cord bundle 31 and the driven side fiber cord bundle 32, it is set smaller than the winding thickness L5. Compared to the case, the third elastic body 43 can be easily elastically deformed. Therefore, when the rotational torque is transmitted from the drive shaft (not shown) to the driven shaft (not shown), the elasticity against vibration and torsion (deflection) generated between the drive shaft and the driven shaft. Since the vibration damping function of the elastic joint 1 can be improved by the deformation, the ride comfort can be improved.

  As shown in FIGS. 4 to 6, the fourth elastic body 44 circumscribes the elastic body circumscribed circle m <b> 1 as viewed from the direction of the axis O <b> 1 of the elastic joint 1 and the outer circumferences of the first elastic body 41 and the second elastic body 42. The rubber member is formed in an octagonal ring shape that is slightly larger than the third elastic body as viewed from the direction of the axis O1 of the elastic joint 1 (viewed from the front of the drawing in FIGS. 5 and 6). Yes.

  As shown in FIG. 4, the rubber thickness L10 of the fourth elastic body 44 is set so as to increase or decrease along the virtual elastic body circumscribed circle m1, and the drilling direction of the hole punching portion 40b (FIG. 6B). ) And FIG. 7 (b) in the vertical direction).

  That is, the rubber thickness L10 of the fourth elastic body 44 is set to a maximum of 5 mm at the center of the extending portion 31b of the driving side fiber cord bundle 31 or the center of the extending portion 32b of the driven side fiber cord bundle 32. It is set so as to gradually decrease as it approaches the driving side winding portion 31a (driven side winding portion 31c) of the fiber cord bundle 31 or the driving side winding portion 32a (driven side winding portion 32c) of the driven side fiber cord bundle 32. ing. The rubber thickness L10 of the fourth elastic body 44 is such that the winding start (end) portion of the driving side winding portion 31a of the driving side fiber cord bundle 31 and the driving side winding portion 32a of the driven side fiber cord bundle 32 and The minimum winding length is set to 2 mm at the winding start (end) portion of the driven side winding portion 31c of the driving side fiber cord bundle 31 and the driven side winding portion 32c of the driven side fiber cord bundle 32.

  Accordingly, the fourth elastic body 44 is configured such that the extending portion 31b and the extending portion 32b that are the bent portions of the driving side fiber cord bundle 31 and the driven side fiber cord bundle 32 are set to be thick, and the driving side is the non-flexing portion. The winding part 31a and the driven side winding part 31c are set to be thin. As a result, the fourth elastic body 44 improves the vibration damping function of the elastic joint 1 by providing the thick portion while reducing the weight by providing the thin portion, and also the driving side fiber cord bundle 31 and the driven side. It is possible to reliably prevent the fiber cord bundle 32 from being exposed.

  The rubber thickness L10 of the fourth elastic body 44 is set to be larger than the difference between the winding portion separation distance L3 and the extended portion separation distance L4. That is, the difference between the winding portion separation distance L3 and the extension portion separation distance L4 is set to a value smaller than the maximum portion of the rubber thickness L10 of the fourth elastic body 44.

  Specifically, the difference between L3 and L4 is 4.5 mm, and the maximum portion of the rubber thickness L10 of the fourth elastic body 44 is set to 5 mm. Therefore, the rubber thickness L10 of the fourth elastic body 44 is determined by the difference between L3 and L4, which is the distance between the extending portion 31b of the drive side fiber cord bundle 31 and the outer center (axial center O1) of the cord circumscribed circle m2. It is set large.

  Therefore, compared with the case where the rubber thickness L10 of the fourth elastic body 44 is set to be smaller than the difference between L3 and L4, the meat stealing portion 50 described later can be set small, and the outer shape line of the elastic joint 1 is connected to the elastic body circumscribing. It can be close to the circle m1.

  Even in this case, since the meat stealing portion 50 is provided between the elastic body 40 and the elastic body circumscribed circle m1, the elastic body 40 (elastic joint 1) is formed in a perfect circle shape. As compared with the above, the weight of the elastic body 40 (elastic joint 1) can be reduced.

  Therefore, when the elastic joint 1 rotates, the vibration of the axis O1 of the elastic joint 1 can be reduced, so that vibrations generated when rotational torque is transmitted from the drive shaft to the driven shaft (both not shown). Etc. can be suppressed, and the transmission performance of the rotational torque of the elastic joint 1 can be stabilized. Therefore, it is possible to improve the output when the rotational torque is transmitted from the drive shaft to the driven shaft.

  The difference between the radius of the cord circumscribing circle and the shortest distance from the outer center of the cord circumscribing circle m2 to the extending portions 31b and 32b on the meat stealing portion 50 side is set smaller than the rubber thickness L10 of the fourth elastic body 44. Therefore, compared with the case where the difference from the shortest distance from the outer center of the cord circumscribing circle m2 to the extending portions 31b, 32b on the meat stealing portion 50 side is set larger than the rubber thickness L10, the driving side collar 10 The separation distance L1 between the shaft center O2 and the shaft center O3 of the driven collar 20 is set small.

  Therefore, when the same torque is applied, the extension of the drive side fiber cord bundle 31 and the driven side fiber cord bundle 32 can be suppressed, and the high output can be increased in the drive side fiber cord bundle 31 and the driven side fiber cord bundle 32. Even when it is loaded, the driving side fiber cord bundle 31 and the driven side fiber cord bundle 32 can be prevented from being broken. Therefore, the durability of the elastic joint 1 can be improved.

  Further, the rubber thickness L10 of the fourth elastic body 44 is set to be thinner than the rubber thickness L9 of the third elastic body 43. The fourth elastic body 44 is disposed on the side of the meat stealing portion 50 of the elastic joint 1, and the third elastic body 43 is disposed on the axis O <b> 1 side of the elastic joint 1. Therefore, the rubber thickness L10 on the meat stealing portion 50 side is thinner than the rubber thickness L9 on the axial center O1 side of the elastic joint 1. Therefore, compared with the case where the rubber thickness L10 of the fourth elastic body 44 is set to be thicker than the rubber thickness L9 of the third elastic body 43, the heat dissipation of the fourth elastic body 44 can be improved. Deterioration of the first elastic body 40 and the second elastic body 42 can also be suppressed, and the durability of the elastic joint 1 can be improved.

  The rubber thickness L10 of the maximum portion of the fourth elastic body 44 is set to be greater than the rubber thickness L7 of the portion disposed between the punched portion 40b and the extending portion 31b (extending portion 32b). Therefore, when the extending portion 31b of the driving side fiber cord bundle 31 and the extending portion 32b of the driven side fiber cord bundle 32 are bent outward in the direction of the axis O1 of the elastic joint 1, the extending portion 31b and the extending portion It can prevent reliably that the installation part 32b is exposed outside. Further, by setting the portion disposed between the punched portion 40b and the extended portion 31b (extended portion 32b) to be thin, the punched portions 40b of the first elastic body 41 and the second elastic body 42 are made to be thin. Since it can expand in the radial direction, the first elastic body 41 and the second elastic body 42 can be set to be easily elastically deformed.

  As shown in FIGS. 4 to 6, the meat stealing portion 50 is a gap set in a dish shape between the outer periphery of the fourth elastic body 44 and the elastic body circumscribed circle m1, and is elastic by the punched portion 40b. In addition to reducing the weight of the body 40 (elastic joint 1), the meat stealing portion 50 can also reduce the weight of the elastic body 40 (elastic joint 1). Further, the meat stealer 50 forms the outer shape of the elastic body 40 (elastic joint 1) in an octagonal shape. Therefore, the thickness of the rubber provided along the extending portions 31b and 32b of the fourth elastic body 44 is made uniform.

  Further, as shown in FIG. 4, the width L11 in the radial direction of the meat stealing portion 50 is set to a maximum of 1.8 mm at the center of the extended portions 31b and 32b (on the radial extension line of the punched portion 40b). Yes. Therefore, the radial width L11 of the meat stealing portion 50 is set to be smaller than the opening width L6 of the punched portion 40b.

  Accordingly, when the elastic body 40 (elastic joint 1) is reduced in weight by the hole punching portion 40b and the meat stealing portion 50, the radial width L11 of the meat stealing portion 50 is set smaller than the winding thickness L5. Since it is set to be smaller than the opening width L6 of the punched portion 40b, the elastic body 40 (elastic joint 1) can be made close to a perfect circle. As a result, the meat stealing portion 50 can be set to a size that does not cause the shaft center O1 of the elastic joint 1 to shake, and the torque transmission performance of the elastic joint 1 can be achieved while reducing the weight of the elastic body 40 (elastic joint 1). Can be improved.

  Further, as shown in FIG. 4, the width L11 of the meat stealing portion 50 in the radial direction is such that the punched portion 40b, the driving side winding portion 31a, and the driven side winding portion 31c (the driving side winding portion 32a and the driven side winding portion). The rubber thickness L8 is set to be smaller than that of the hook portion 32c). Therefore, the outer shape of the elastic body 40 (elastic joint 1) can be made closer to a perfect circle. Therefore, the torque transmission performance of the elastic body 40 (elastic joint 1) can be improved while further reducing the weight of the elastic body 40 (elastic joint 1).

  Furthermore, since the opening width L6 of the punched portion 40b is set smaller than the winding thickness L5 of the driving side fiber cord bundle 31 and the driven side fiber cord bundle 32, compared to the case where the opening width L6 is set larger than the winding thickness L5. Thus, the volume of the space portion of the punched portion 40b can be reduced. Therefore, it is possible to secure the rubber amount of the first elastic body 41 and the second elastic body 42 disposed inside the drive side fiber cord bundle 31 and the driven side fiber cord bundle 32, and the drive side collar 10 (drive shaft). The steering stability can be improved when power (torque) is transmitted from the motor to the driven collar 20 (driven shaft).

  In addition, since the opening width L6 of the hole punching portion 40b is set larger than the radial width L11 of the meat stealing portion 50, the drive side that becomes hot at a portion closer to the axis O1 than the meat stealing portion 50 side of the elastic joint 1 The heat dissipation of the first elastic body 41 and the second elastic body 42 arranged on the inner peripheral side of the fiber cord bundle 31 and the driven side fiber cord bundle 32 can be improved and the weight can be reduced.

  In addition, the width L11 in the radial direction of the meat stealing portion 50 is set so that the driving side winding portion 31a (driven side winding portion 31c) of the driving side fiber cord bundle 31 or the driving side winding portion 32a of the driven side fiber cord bundle 32 ( It is set to disappear while gradually decreasing as it approaches the driven side winding portion 32c). Therefore, it is possible to prevent the step portion from being formed on the outer peripheral surface of the fourth elastic body 44, and the flow of traveling wind flowing in the circumferential direction of the outer peripheral surface of the fourth elastic body 44 can be made smooth.

  Further, since the radial width L11 of the meat stealing portion 50 is set to be smaller than the rubber thickness L8 of the first elastic body 41 and the second elastic body 42, the meat stealing portion 50 is minimized. Since the outer periphery of 1) can be made close to a perfect circle shape, the flow of the traveling wind flowing in the circumferential direction of the outer peripheral surface of the fourth elastic body 44 can be made smoother, and the elastic body 40 (elasticity) by the traveling wind can be made. The cooling performance of the joint 1) can be further improved.

  Four driving side collars 10 and four driving side collars 10 are arranged, and the separation distance between the axial center O2 of the adjacent driving side collar 10 and the axial center O3 of the driving side collar 10 is equal. Since it is set, four locations connected to the drive shaft and the driven shaft (both not shown) can be provided at equal intervals. Accordingly, when the driving side collar 10 and the driven side collar 20 are loaded with torque from the driving shaft or the driven shaft, the driving side fiber cord bundle 31 or the driven side fiber cord which is the vibration absorbing portion is provided at four places, upper, lower, left and right. Since the bundle 32 and the rubber portion arranged around the bundle 32 can be arranged, the drive-side fiber cord bundle 31 can be used regardless of the direction in which vibration and twist (bend) occur between the drive shaft and the driven shaft. And the driven side fiber cord bundle 32 and the elastic body 40 can be elastically deformed, and the vibration damping function of the elastic joint 1 can be improved.

  Next, referring to FIG. 9 to FIG. 12, a yarn winding device 100 used when the fiber cord 101 forming the fiber cord bundle 30 (see FIG. 10) is wound around the driving side collar 10 and the driven side collar 20. explain.

  9 is a schematic front view of the yarn winding device 100, FIG. 10 is a partial side view of the yarn winding device 100 viewed from the direction of the arrow A3 in FIG. 9, and FIG. 11 is a XI portion in FIG. FIG. 12 is a partially enlarged front view of the yarn winding device 100, and FIG. 12 is a partially enlarged front view of the yarn winding device 100 in the XII portion of FIG.

  As shown in FIG. 9, a yarn winding device 100 is a device that winds a fiber cord 101 around a pair of driving side collars 10 and driven side collars 20 fixed to a table 129 installed in an apparatus frame 110A. A bobbin 103 fixed to a support portion 102 provided below the frame 110A (lower side in FIG. 9) around which the fiber cord 101 is wound, and the bobbin 103 is rotated around the axis O5 to move the fiber cord 101 upward (FIG. 9). An electric motor M (see FIG. 10) that is fed upward), a holding portion 104 (see FIG. 12) that holds the tip 101A (see FIG. 12) of the fiber cord 101 that has been fed out from the bobbin 103, and a holding portion 104 and a bobbin. A tension adjusting unit 105 that adjusts the tension of the fiber cord 101 between the fiber cord 103 and the fiber cord 10 whose tension is adjusted by the tension adjusting unit 105 A cord winding mechanism 107 that winds a pair of driving side collar 10 and driven side collar 20, tension detecting means 108 that detects the tension of the fiber cord 101, and electric motor M based on the detection result of the tension detecting means 108 Is configured to include a control device 109 (see FIG. 11).

  In the yarn winding device 100, the fiber cord 101 is unwound from the bobbin 103 toward the upper tension adjusting unit 105 (upper side in FIG. 9), and is stretched in the horizontal direction (left and right direction in FIG. 9) by the tension adjusting unit 105. The feeding path of the fiber cord 101 is set so that the tension adjusting unit 105 is inserted into a nozzle 106 described later of the cord winding mechanism 107 from above.

  As shown in FIGS. 9 and 10, the bobbin 103 includes a hollow rotating drum 111 and a bobbin side flange 112 projecting outward from the both ends of the rotating drum 111 in the radial direction (vertical direction in FIG. 10). The fiber cord 101 is wound around the drum 111 and the fiber cord 101 is divided by a bobbin side flange 112.

  Further, a first shaft portion 113 protruding from one end of the rotating drum 111 in the axial direction (left-right direction in FIG. 10) is supported by the support portion 102 via the bearing B. The support 102 is fixed to a base frame 110B installed below the apparatus frame 110A.

  Then, when the tension of the fiber cord 101 reaches a set value based on the detection result of the tension detecting means 108, the control device 109 rotates the electric motor M. As a result, the fiber cord 101 is fed out from the bobbin 103. Further, when the tension of the fiber cord 101 becomes smaller than the set value, the control device 109 stops the rotation of the electric motor M. Thereby, the feeding of the fiber cord 101 from the bobbin 103 is stopped.

  Further, a column 110C is erected on the apparatus frame 110A, and a pair of upper and lower guide rings 150 for guiding the fiber cord 101 between the bobbin 103 and a first tension roller 121 described later are disposed on the column via the arm 110c. Is provided. The guide ring 150 will be described in detail later.

  As shown in FIGS. 9 and 11, the tension adjusting unit 105 includes a first tension roller 121, a second tension roller 122 disposed below the first tension roller 121 (downward in FIG. 9), and a first tension roller. A first swing arm 131 that swingably supports 121 with respect to the apparatus frame 110A, a second swing arm 132 that swingably supports the second tension roller 122 with respect to the apparatus frame 110A, and a first A first coil spring 141 that swings and biases the first swing arm 131 to one side of the swing direction about the swing axis Y1 (arrow A1 side in FIG. 9), and a second swing shaft Y2 as the center. A second coil spring 142 that swings and biases the second swing arm 132 to one side (arrow A2 side in FIG. 9) of the rotating direction, and winding of the fiber cord 101 around the first tension roller 121 Only the first auxiliary roller 151 for the corners to increase, and is configured and a second auxiliary roller 152 to increase the wrapping angle of the fiber cord 101 to a second tension roller 122.

  A first auxiliary roller 151 is disposed on the lower side of the first tension roller 121 (lower side of the fiber cord 101 in the feeding direction) in the feeding direction of the fiber cord 101 (the arrow H direction in FIG. 9). The second auxiliary roller 152 is arranged on the upper side of the second tension roller 122 (upward side in the feeding direction of the fiber cord 101) in the direction of arrow 9 (H direction). The first auxiliary roller 151 is supported by the apparatus frame 110A via the first support arm 161, and the second auxiliary roller 152 is supported by the apparatus frame 110A via the second support arm 162.

  As shown in FIG. 11, the tension detecting means 108 is a limit switch 116 that is turned on / off by the base end portion of the first swing arm 131, and the limit switch 116 includes a swing piece 117 that is a spring plate. When the swing piece 117 presses the proximal end portion of the first swing arm 131, the limit switch 116 is turned on. When the limit switch 116 is turned on, the bobbin 103 (see FIG. 9) is fed out and rotated by the electric motor M. Further, when the pressing of the proximal end portion of the first swing arm 131 against the swing piece 117 is released, the limit switch 116 is turned off and the bobbin 103 is driven to be driven to rotate out by the electric motor M.

  Therefore, as shown in FIG. 9, the tension adjusting unit 105 includes the first tension roller 121 and the second tension roller 122 positioned on the lower side (left side in FIG. 9) of the fiber cord 101 than the first tension roller 121. The first tension roller 121 is positioned above the bobbin 103 (upper side in FIG. 9), and the second tension roller 122 is positioned above the nozzle 106 (upper side in FIG. 9), which will be described later. Responsiveness of the first tension roller 121 and the second tension roller 122 with respect to the change of the above can be improved.

  That is, the second tension roller 122 positioned above (described above in FIG. 8) the nozzle 106 described later can cope with a change in tensile force applied by the nozzle 106 described later to the tip portion (winding portion) of the fiber cord 101. The first tension roller 121 above the bobbin 103 can cope with a change in tensile force applied to the rear end portion (feeding portion) of the yarn by the bobbin 103. Therefore, the responsiveness of the tension roller to a change in tension can be improved compared to a case where both tension forces are handled by a single tension roller. As a result, vibration of each part of the yarn winding device 100 can be suppressed.

  The winding angle of the fiber cord 101 around the first tension roller 121 can be increased by the first auxiliary roller 151, and the winding angle of the second tension roller 122 around the fiber cord 101 can be increased by the second auxiliary roller 152. Since it can be enlarged, the rotation of the first tension roller 121 and the second tension roller 122 and the tension applying action can be performed smoothly and reliably. Therefore, the winding operation of the fiber cord 101 can be performed more reliably.

  The first swing arm 131 is swing-biased by the first coil spring to apply tension to the fiber cord 101, and the second swing arm 132 is swing-biased by the second coil spring to tension the fiber cord 101. Therefore, the tension adjusting unit 105 can have a simple configuration. In addition, since the tension detecting means 108 is a limit switch 116 that is turned on and off by the first swing arm 131, the structure of the tension detecting means 108 can be determined while being capable of accurately detecting the tension of the fiber cord 101. It can be simplified.

  As shown in FIG. 12, the cord winding mechanism 107 is tertiary with respect to the nozzle 106 through which the fiber cord 101 is inserted on the upper side (upper side in FIG. 12) of the fiber cord 101 than the holding portion 104 and the apparatus frame 110A. A robot 123 that is movable in the original direction (vertical / horizontal / front / rear direction) and a connecting member 126 that connects the robot 123 and the nozzle 106 are provided.

  As shown in FIG. 12, the nozzle 106 is formed in an elongated cylindrical hollow pipe shape along the vertical direction (vertical direction in FIG. 12), and the nozzle 106 is arranged around a vertical axis X (see FIG. 13) described later. The fiber cord 101 is wound around the driving side collar 10 and the driven side collar 20 while circularly moving on the rotation locus C (see FIG. 13).

  As shown in FIG. 12, the robot 123 is driven to rotate about an axis O4 that coincides with the longitudinal axis X passing through the center between the axis O2 of the driving side collar 10 and the axis O3 of the driven side collar 20. The rotating shaft 24 is provided in the head 125.

  A first cord through hole 181 concentric with the axis O4 is formed through the rotary shaft 124 in the center in the radial direction (left and right direction in FIG. 12). Further, the nozzle 106 is connected to the outer peripheral portion of the rotating shaft 124 via the connecting member 126 in a state where the nozzle 106 is positioned away from the axis O4 in the radial direction of the rotating shaft 124 (left and right direction in FIG. 12). Is moved in a three-dimensional direction by a plurality of fluid cylinders (not shown), and its rotating shaft 124 is rotationally driven by an electric motor (not shown) for the rotating shaft.

  As shown in FIG. 12, the connecting member 126 is a member formed in an L shape when viewed from the front (viewed from the front side of FIG. 11), and a piece 126 </ b> A of the connecting member 126 is formed at the lower end of the rotating shaft 124. The upper end 126J is fixed. A second cord through hole 182 having a long hole is formed in one piece 126A of the connecting member 126 in the vertical direction (up and down direction in FIG. 12) in the thickness direction (left and right direction in FIG. 12). A first guide roller 171 for guiding the fiber cord 101 inserted into the first cord through hole 181 from above (upper side in FIG. 12) to the second cord through hole 182 is provided in the portion 126J.

  Further, a second guide roller 172 that guides the fiber cord 101 inserted into the second cord through hole 182 to the hollow portion 106A of the nozzle 106 is provided on the other piece 126B that is bent vertically from the one piece 126A of the connecting member 126. The first guide roller 171 is rotatably supported by a first roller bracket 173 fixed to one piece 126A of the connecting member 126, and the second guide roller 172 is fixed to the upper surface of the other piece 126B of the connecting member 126. A two-roller bracket 174 is rotatably supported.

  As shown in FIG. 12, the fiber cord 101 from the first cord through hole 181 of the rotating shaft 124 to the nozzle 106 is viewed from the penetrating direction of the second cord through hole 182 (viewed from the left or right direction in FIG. 12). ) The first cord through hole 181, the first guide roller 171, the second cord through hole 182, the second guide roller 172, and the nozzle 106 are arranged so as to be in a straight line.

  Also, as shown in FIGS. 9 and 10, a pair of upper and lower guide rings 150 are supported by the apparatus frame 110A, and the center G1 of the guide ring 150 on the lower side (lower side in FIGS. 9 and 10) and the axis of the bobbin 103. The length N1 in the vertical direction (the vertical direction in FIG. 9 and FIG. 10) with respect to T is three times or more the maximum value of the roll diameter R of the fiber cord bundle 30 wound around the bobbin 103 (in this embodiment) 5 times).

  Further, the length N1 is at least twice the maximum value of the winding length N2 of the roll-shaped fiber cord bundle 30 (the length in the direction corresponding to the axial direction of the bobbin 103, the length in the left-right direction in FIG. 10) ( In this embodiment, the pair of upper and lower guide rings 150 is vertically above the axial center T of the bobbin 103 (the horizontal direction in FIG. 10) and the radial direction (the vertical direction in FIG. 10). 9 and 10 in FIG. Accordingly, the first tension roller 121 is positioned above the pair of upper and lower guide rings 150, and the fiber cord 101 between the first tension roller 121 and the lower guide ring 150 can be set in a vertical posture. A tension roller 121 is disposed.

  According to this configuration, the length N1 in the vertical direction (the vertical direction in FIG. 9 and FIG. 10) between the center (G1) of the lower guide ring 150 (the lower side in FIG. 10) and the axis T of the bobbin 103 is the bobbin 103. Is set to 3 times or more (5 times in this embodiment) the maximum value of the roll diameter R of the fiber cord bundle 30 wound around. Therefore, when the lower end of the fiber cord 101 between the guide ring 150 and the bobbin 103 is positioned at one end (right end in FIG. 10) or the other end (left end in FIG. 10) of the bobbin 103, the vertical direction The inclination angle θ1 of the fiber cord 101 with respect to (vertical direction in FIG. 10) (the inclination angle θ2 of the fiber cord 101 when viewed from the outside in the radial direction of the bobbin 103 (front side or back side in FIG. 10)) can be reduced. In addition, the inclination angle θ2 of the fiber cord 101 with respect to the vertical direction (the vertical direction in FIG. 9) (inclination angle θ2 of the fiber cord 101 when viewed from the outside in the axial direction of the bobbin 103 (front side or front side in FIG. 9)) is also small. can do.

  As a result, when the lower end of the fiber cord 101 is positioned at one end (right end in FIG. 10) or the other end (left end in FIG. 10) of the bobbin 103, the fiber cord 101 is separated from the guide ring 150 or the bobbin 103. The resistance received can be reduced. When the lower end of the fiber cord 101 is located in the center of the bobbin 103 in the axial direction (left and right phrases in FIG. 10), the resistance is reduced, so that the change in the tension of the fiber cord 101 can be reduced. Therefore, it can suppress that each part of the yarn winding device 100 vibrates, and the driving side collar 10 and the driven side are arranged so that no disturbance occurs between the fiber cords 101 with respect to the adjacent driving side collar 10 and the driven side collar 20. The fiber cord 101 can be wound around the collar 20.

  Here, a process of winding the fiber cord 101 around the driving side collar 10 and the driven side collar 20 using the yarn winding device 100 will be described.

  First, as shown in FIG. 9, the driving side collar 10 and the driven side collar 20 are attached to a support 120 formed in a disk shape with bolts and nuts (both not shown) in the direction of the axis O2 (O3) (upper and lower sides in FIG. 9). Direction) and supported by the table 129. Eight collars 10 and 20 are fixed to the support 120.

  Next, the fiber cord 101 fed out from the bobbin 103 is guided by a pair of guide rings 150, and includes a first tension roller 121, a first auxiliary roller 151, a second auxiliary roller 152, and a second tension roller 122. And is inserted into the first cord through hole 181 of the rotating shaft 124, the second cord through hole 182 of the connecting member 126, and the hollow portion 160A of the nozzle 106, and the tip portion 101A of the fiber cord 101 is paired In a state of being clamped by the clamping member 115 (see FIG. 12), the axis O4 of the rotating shaft 24 coincides with the above-described longitudinal axis X (see FIG. 13) in plan view (viewed from the front side of FIG. 9). Thus, the robot 123 is moved three-dimensionally.

  When the axis O4 of the rotating shaft 24 and the vertical axis X (see FIG. 13) coincide with each other, a motor (not shown) for the rotating shaft 124 is driven to rotate, and the rotating shaft 124 rotates to the axis O4 (vertical axis). The fiber cord 101 is wound around the adjacent driving side collar 10 and driven side collar 20 by circular movement around the center X) (see FIG. 12). At this time, based on the detection result of the limit switch 116, the control device 109 (see FIG. 9) drives the electric motor M (see FIG. 9), and the bobbin 103 is fed out and rotated by the electric motor M.

  When the winding of the fiber cord 101 is completed, the electric motor (not shown) for the rotating shaft is stopped. Then, the yarn portion between the winding end portion of the fiber cord 101 and the tip portion (lower end portion) of the nozzle 106 is cut by a cutting blade (not shown) provided on the head 125 of the robot 123.

  Such an operation is repeated for the other driving side collar 10 and the driven side collar 20 supported by the table 129. When the winding of the fiber cord 101 is completed on the eight collars 10 and 20 in this way, the eight collars 10 and 20 around which the fiber cord 101 is wound are taken out from the yarn winding device 100 together with the support 120. The eight collars 10 and 20 are set together with the support 120 in a mold (not shown), and the elastic member is vulcanized.

  Finally, the relationship between the speed of the nozzle 106 and the feed amount of the fiber cord 101 when the nozzle 106 winds the fiber cord 101 around the driving side collar 10 and the driven side collar 20 will be described with reference to FIG. FIG. 13 is a schematic plan view of the driving side collar 10 and the driven side collar 20 showing the trajectory of the fiber cord 101 when the nozzle 106 winds the fiber cord 101 around the driving side collar 10 and the driven side collar 20.

  Further, FIG. 13 shows the speed V of the nozzle 106 at each time point when the fiber cord 101 is wound around the driving side collar 10 and the driven side collar 20 and the tangent line between the driving side collar 10 and the driven side collar 20 at each time point. The velocity V1 of the nozzle 106 in the direction and the velocity V2 in the direction orthogonal to the tangential direction are shown. The rotation trajectory of the nozzle 106 that rotates about the vertical axis X is indicated by a solid line C, and the rotation trajectory of the nozzle 106 when the ellipse moves around the vertical axis X is indicated by a broken line D. ing.

  As shown in FIG. 13, when the fiber cord 101 is wound, the nozzle 106 rotates at a constant rotational speed, so the speed V of the nozzle 106 at each time is constant, but the drive side at each time The speed V1 of the nozzle 106 in the tangential direction of the collar 10 and the driven side collar 20 differs greatly. This V1 corresponds to the feeding amount (feeding length) of the fiber cord 101. When V1 is large, the feeding amount (feeding length) of the fiber cord 101 is large, and when V1 is small, the feeding amount (feeding length) of the fiber cord 101 is large. S) becomes smaller.

  Therefore, when the nozzle 106 moves away from the driving side collar 10 and the driven side collar 20 in the circular locus of the nozzle 106, the feeding amount of the fiber cord 101 increases, and the nozzle 106 approaches the driving side collar 10 and the driven side collar 20. Sometimes the feeding amount (feeding length) of the fiber cord 101 decreases. That is, while the fiber cord 101 is being wound, the tension of the fiber cord 101 is constantly changing due to an increase or decrease in the feed amount of the fiber cord 101. According to the yarn winding device 100 of the present invention, the nozzle 106 is The second tension roller 122 positioned above the nozzle 106 can cope with the change in the tensile force applied to the tip of the fiber cord 101, and the responsiveness to the change in tension can be improved. Therefore, vibration of each part of the yarn winding device 100 can be suppressed.

  Therefore, the nozzle 106 is driven while circularly moving around the longitudinal axis X passing through the centers of the axis O2 of the driving side collar 10 and the axis O3 of the driven side collar 20 supported by the table 129 (see FIG. 9). Since the fiber cord 101 is wound around the side collar 10 and the driven side collar 20, the nozzle 106 is more wound than the case where the fiber cord 101 is wound around the longitudinal axis X while making an ellipse movement around the rotation axis D. The structure of the rotation mechanism for rotating the fiber cord 101 can be simplified, and the time required for winding the fiber cord 101 can be shortened.

  Although the present invention has been described based on the embodiments of the present invention, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  In the above embodiment, the case where the separate inner cylinder members 10a and 20a are press-fitted into the driving side collar 10 and the driven side collar 20, respectively, has been shown. However, the collars 10 and 20 and the inner cylinder member 10a are used. 20a can be integrally formed.

  In this case, the assembling work for assembling the inner cylindrical members 10a and 20a to the driving side collar 10 and the driven side collar 20, respectively, can be omitted, and the work before setting the driving side collar 10 and the driven side collar 20 to the mold. Can be simplified.

  In addition, the same number of punched portions 40b as the driving side collar 10 and the driven side collar 20 are drilled, but only the first elastic body 41 disposed on the inner periphery of the driving side fiber cord bundle 31 has the punched portions 40b. You may drill.

  In this case, the spring constant of the first elastic body 41 disposed on the inner periphery of the driving side fiber cord bundle 31 is different from the spring constant of the second elastic body 42 disposed on the inner periphery of the driven side fiber cord bundle 32. It can be set and can cope with various vibrations generated between the drive shaft and the driven shaft.

(A) is a front view of the elastic joint in one embodiment of the present invention, (b) is a side view of the elastic joint viewed from the I (b) direction of FIG. 1 (a). It is sectional drawing of the elastic joint in the II-II line of the figure of FIG. It is sectional drawing of the elastic coupling in the III-III line of FIG. It is an enlarged front view of the elastic joint in the IV section of FIG. It is sectional drawing of the elastic joint in the VV line | wire of FIG.1 (b). It is sectional drawing of the elastic joint in the VI-VI line of FIG.1 (b). (A) is sectional drawing of the elastic joint in the VIIa-VIIa line | wire of Fig.4 (a), (b) is sectional drawing of the elastic coupling in the VIIb-VIIb line | wire of Fig.4 (a). (A) is sectional drawing of the elastic coupling in the VIIIa-VIIIa line of Fig.4 (a), (b) is sectional drawing of the elastic coupling in the VIIIb-VIIIb line of Fig.4 (a). It is a schematic front view of a yarn winding device. FIG. 10 is a partial side view of the yarn winding device viewed from the direction of arrow A3 in FIG. 9. FIG. 10 is a partially enlarged front view of the yarn winding device in the XI portion of FIG. 9. FIG. 10 is a partially enlarged front view of the yarn winding device at the XII portion in FIG. 9. It is a schematic plan view of the driving side collar and the driven side collar showing the trajectory of the fiber cord.

Explanation of symbols

1 Elastic joint 10 Drive side collar (Drive side connection element)
20 Driven side collar (driven side connection element)
30 Fiber cord bundle 31 Drive side fiber cord bundle (part of fiber cord bundle)
32 Driven side fiber cord bundle (part of fiber cord bundle)
40 elastic body 40b hole-extracted portion 44 fourth elastic body (elastic portion on the side of meat stealing portion)
50 Meat stealing part L1 separation distance (separation distance between the axis of the drive-side connection element and the axis of the driven-side connection element adjacent to each other)
L2 separation distance (distance between the outer circumference of the cord circumscribing circle and the axis of the drive side connection element or driven side connection element)
L3 winding part separation distance (radius of code circumscribed circle)
L4 Extension part separation distance (shortest distance from the outer circumference of the cord circumscribing circle to the fiber cord on the meat stealer side)
L5 winding thickness (winding thickness of fiber cord bundle)
L6 opening width (width in the circumferential direction of the punched part)
L7 Rubber thickness (Rubber thickness in the circumferential direction of the elastic body between the extension part of the fiber cord bundle)
L8 rubber thickness (rubber thickness in the radial direction of the elastic body between the punched portion and the winding portion of the fiber cord bundle)
L10 Rubber thickness (Rubber thickness of the outer peripheral elastic part)
L11 width (radial width of the meat stealer)
m1 Elastic circumscribing circle m2 Cord circumscribing circle O1 axis (axial center of elastic joint, outer center of elastic circumscribing circle, outer center of cord circumscribing circle)
O2 axis (axis on the drive side connection)
O3 axis (axis of driven side connection)

Claims (4)

A plurality of drive-side connection elements connected to the drive shaft; a plurality of driven-side connection elements that are alternately arranged concentrically with the drive-side connection element and connected to the driven shaft; A plurality of endless fiber cord bundles formed by winding fiber cords around the driven side connection elements, the plurality of fiber cord bundles, the plurality of drive side connection elements, and the plurality of driven side connection elements are buried. And an elastic body formed in a polygonal shape as viewed from the axial direction of the drive side connection element or the driven side connection element, and the view from the axial direction of the drive side connection element or the driven side connection element. When an elastic body circumscribed circle that is a virtual circle circumscribing the elastic body is set, an elastic joint comprising a meat stealing portion that is a gap provided between the elastic body circumscribed circle and the elastic body,
The elastic body includes an outer peripheral side elastic portion provided along the outer peripheral surface of the endless fiber cord bundle and disposed on the meat stealing portion side,
A cord circumscribing circle that is concentric with the circumscribed circle of the elastic body and is a virtual circle circumscribing the plurality of endless fiber cord bundles when viewed from the axial direction of the drive side connection element or the driven side connection element is set. In this case, the difference between the radius of the cord circumscribing circle and the shortest distance from the outer center of the cord circumscribing circle to the outer peripheral surface of the fiber cord bundle on the meat stealer side is greater than the maximum thickness of the outer peripheral elastic portion. An elastic joint characterized by being set small. The elastic body includes a punched portion that is a hole drilled in the axial direction of the drive side connection element or the driven side connection element between the adjacent drive side connection element and the driven side connection element. ,
The elastic joint according to claim 1, wherein a width of the meat stealing portion in a radial direction is set smaller than a width of the punched portion in a circumferential direction.   The separation distance between the axis of the drive-side connection element and the axis of the driven-side connection element provided adjacently is from the outer center of the cord circumscribing circle to the axis of the drive-side connection element or the driven-side connection element. The elastic joint according to claim 2, wherein the elastic joint is set shorter than the distance between the two. The drive-side connection element and the driven-side connection element are arranged in four each, and the separation distance between the adjacent drive-side connection element and the driven-side connection element is the same. The elastic joint according to claim 3, wherein the elastic joint is set to an interval.

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