JP2010060015A - Flexible coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible coupling which can prevent damage by suppressing excess elastic displacements of a first elastic plate and second elastic plate of the flexible coupling, and keep high rotation transmitting accuracy for a long period of time. <P>SOLUTION: The flexible coupling 1 is formed by providing a pair of first elastic plates 7 between a first connecting member 4 and a partitioning member 6, by providing a pair of second elastic plates 8, which face in right-angled direction with respect to the first elastic plates 7, between the partitioning member 6 and second connecting member 5, by connecting the first connecting member 4 with a drive shaft 2, and by connecting the second connecting member 5 with a driven shaft 3, wherein through-holes 11, 16 and 17 penetrating in an axis direction of the drive shaft 2 are formed in the first connecting member 4, the partitioning member 6 and the second connecting member 5, respectively, and a regulating rod 9, regulating the elastic deformations of the first elastic plates 7 and the second elastic plates 8 to be a predetermined deformation, is provided in each of the through-holes with a space. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flexible shaft coupling that connects a drive shaft and a driven shaft.

  Conventionally, as seen in Patent Document 1 below, a machining tool for a workpiece is provided between a drive shaft of a machine tool or the like and a driven shaft to which a machining tool is connected, and the driven shaft is displaceable with respect to the drive shaft. A flexible shaft coupling that enables position adjustment is known.

  As shown in FIG. 3, the flexible shaft joint 30 in Patent Document 1 is provided in a boring device 33 that boring a camshaft bearing hole 32 of a cylinder head 31 of an internal combustion engine that is a workpiece. The drive shaft 34 of the processing apparatus 33 and the driven shaft 36 provided with the processing tool 35 are connected. As shown in FIGS. 3 and 4, the flexible shaft joint 33 is disposed with a first connection member 37 to which the drive shaft 34 is connected, and spaced apart from the first connection member 37 in the axial direction of the drive shaft 34. A second connecting member 38 to which the driven shaft 36 is connected, and a partition member 39 disposed between the first connecting member 37 and the second connecting member 38 are provided. Further, a pair of first elastic plates 40 is provided between the first connecting member 37 and the partition member 39, and a pair of second elastic plates 41 is provided between the partition member 39 and the second connecting member 38. Is provided.

  The pair of first elastic plates 40 are arranged in parallel with each other with the rotation axis interposed between the first connecting member 37 and the partition member 39. The pair of second elastic plates 41 are arranged in parallel with each other with the rotation axis interposed between the partition member 39 and the second connecting member 38. The second elastic plate 41 is arranged so as to face a direction perpendicular to the first elastic plate 40, and elastic displacement in the XY direction in a plane perpendicular to the rotation axis of the flexible shaft joint 30 is enabled. Yes.

  On the other hand, as shown in FIG. 3, the support jig 42 that receives the cylinder head 31 that is a workpiece has a support hole 43 into which the driven shaft 36 of the processing tool 35 is inserted, and a support hole 44 into which the processing tool 35 is inserted. Are formed with the axis thereof directed vertically.

  When the machining tool 35 is lowered in the axial direction, the axes of the support holes 43 and 44 are not completely oriented in the vertical direction or the axes of the support holes 43 and 44 are parallel to the axis of the machining tool 35. In the case of deviation, the deviation is absorbed by the elastic deformation of the first elastic plate 40 and the second elastic plate 41 of the flexible shaft joint 30, and thereby the axis of the processing tool 35 becomes the axis of the support holes 43 and 44. The camshaft bearing hole 32 can be bored with high precision by matching.

However, as described above, when the processing tool 35 is lowered in the axial direction at the time of processing, it is possible to easily perform high-precision processing by providing the restriction portions by the support holes 43 and 44. For example, NC processing When the operation of moving the machining tool in the direction intersecting the axis is frequently performed as in the case of changing the tool, the first elastic plate 40 and the second elastic plate 41 of the flexible shaft joint 30 are rotated. Excessive elastic deformation in the X-Y direction on a plane perpendicular to the axis may cause damage such as cracks in the first elastic plate 40 or the second elastic plate 41 and possibly prevent high rotation transmission accuracy from being maintained. is there.
JP-A-5-302628

  In view of the above points, the present invention can suppress excessive elastic displacement of the first elastic plate and the second elastic plate of the flexible shaft joint to prevent the damage and maintain high rotation transmission accuracy over a long period of time. It is an object of the present invention to provide a flexible shaft coupling that can be used.

  In order to solve this problem, the present invention provides a first connecting member to which a drive shaft is connected, a first connecting member that is spaced apart from the first connecting member in the axial direction of the drive shaft, and is connected to a driven shaft. Two connection members, a partition member disposed between the first connection member and the second connection member, and a parallel connection between the first connection member and the partition member, each one end being the first A pair of first elastic plates connected to one connecting member and connected at the other end to the partition member, and the partition member and the second connecting member are arranged in parallel with each other, and each one end is connected to the partition. A pair of second elastic plates connected to a member and having the other end connected to the second connection member, and the second elastic plate is disposed so as to face a direction perpendicular to the first elastic plate. In the bent shaft joint, the first connecting member and the partition member In addition, a through-hole penetrating in the axial direction of the drive shaft is formed in each of the second connecting members, and each through-hole is passed through each through-hole across the first connecting member, the partition member, and the second connecting member. There is provided a regulating rod which is inserted with a gap and restricts elastic deformation of the first elastic plate and the second elastic plate to a predetermined deformation amount.

  According to the present invention, with the above configuration, the first and second elastic plates can be displaced in the XY direction in a plane perpendicular to the rotation axis by elastic deformation of the first elastic plate, and the elastic deformation is caused by the restriction rod. The amount of deformation can be restricted to a predetermined amount. As a result, the first elastic plate and the second elastic plate are not excessively elastically deformed in the XY direction on a plane perpendicular to the rotation axis thereof, and damage to the first elastic plate and the second elastic plate is prevented. High rotation transmission accuracy can be maintained over a long period of time.

  In the present invention, at least one of the through hole of the first connecting member and the through hole of the second connecting member is attached to the through hole, the regulating rod, and the gap, and the regulating rod is attached to the through hole. It is preferable to provide an elastic member that is biased and held on the same axis as the drive shaft. According to this, while allowing the movement of the restriction rod relative to the first connecting member, the restriction rod can be brought into the same axis as the drive shaft by the biasing of the elastic member, and the rotation transmission accuracy can be further improved. Can do.

  Further, in the present invention, the restriction rod includes a flange portion that protrudes to the outer periphery located on the side of at least one of the first connecting member and the second connecting member, and the connecting member includes It is preferable to provide a receiving part for holding the collar part with play. According to this, while allowing the movement of the restriction rod relative to the first connecting member, the movement of the restriction rod can be restricted to the play range of the flange, and the deformation amount of the first elastic plate and the second elastic plate can be further increased. It can be reliably regulated to prevent damage.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing a flexible shaft coupling of this embodiment, and FIG. 2 is a cross-sectional explanatory view taken along the line II-II in FIG.

  As shown in FIG. 1, the flexible shaft coupling 1 of this embodiment connects the drive shaft 2 with which the processing apparatus outside a figure is equipped, and the driven shaft 3 by the side of a processing tool. The flexible shaft coupling 1 includes a first connecting member 4, a second connecting member 5, and a partition member 6, a pair of first elastic plates 7, and a pair of second elastic plates 8. It is integrally formed by cutting using a block-shaped spring material or the like. Further, a regulating rod 9 penetrating over the first connecting member 4, the partition member 6, and the second connecting member 5 is provided.

  The first connecting member 4 includes a large-diameter portion 10 that is a relatively thick plate member formed in a circular shape, and a first through-hole through which the restriction rod 9 penetrates in the axial center of the large-diameter portion 10. 11 is formed. At the center of the large-diameter portion 10, a cylindrical small-diameter protruding portion 13 that is attached to the connecting portion 12 of the drive shaft 2 is formed with its axis line aligned with the axis line of the large-diameter portion 10. A screw hole 14 is formed in the large-diameter portion 10 of the first connecting member 4, and the large-diameter portion 10 is connected to the drive shaft by the screw 15 in a state where the small-diameter protruding portion 13 is attached to the connecting portion 12 of the drive shaft 2. The two connecting portions 12 are fixed.

  The second connecting member 5 is a relatively thick plate member formed in a circular shape whose axis coincides with the first connecting member 4, and a second through hole 16 is formed in the axis. Further, as will be described later, the restriction rod 9 penetrates and is inserted into the second through hole 16.

  The partition member 6 is a relatively thick plate member formed in a circular shape whose axial center coincides with the first connecting member 4 and the second connecting member 5, and the outer diameter thereof is substantially the same as the outer diameter of the first connecting member 4. It is the same. A third through hole 17 through which the restriction rod passes is formed in the axial center of the partition member 6.

  The first elastic plates 7 have a rectangular shape that is long in the vertical direction. As shown in FIG. 2, the first elastic plates 7 are arranged in parallel with each other with the rotation axis between the first connecting member 4 and the partition member 6. As shown in FIG. 1, the first elastic plate 7 has an upper end portion integrally connected to the lower end surface of the first connecting member 4, and a lower end portion integrally connected to the upper end surface of the partition member 6.

  Similar to the first elastic plate 7, the second elastic plate 8 has a rectangular shape that is long in the vertical direction. As shown in FIG. 1, the rotation axis is sandwiched between the partition member 6 and the second connecting member 5. They are arranged parallel to each other. The second elastic plate 8 has an upper end portion integrally connected to the lower end surface of the partition member 6 and a lower end portion integrally connected to the upper end surface of the second connecting member 5. Further, the second elastic plate 8 is arranged so as to face the direction perpendicular to the first elastic plate 7. Thereby, the elastic displacement of the XY direction in the plane orthogonal to the rotating shaft line of the flexible shaft coupling 1 is enabled.

  As shown in FIG. 1, the restriction rod 9 includes a rod-like base portion 18 that extends between the first connecting member 4 and the second connecting member 5 and extends along the rotational axis of the flexible shaft coupling 1. The base portion 18 is formed in a hollow tubular shape, and a long bolt shaft 19 is inserted therein. The base portion 18 is passed through the third through hole 17 of the partition member 6 with a gap. In addition, a flange portion 20 is formed on the upper end portion of the base portion 18 so as to project to the outer periphery along the lower end surface of the first connection member 4. An extending end portion 21 that is inserted through the 1 through hole 11 is formed. The extended end portion 21 is inserted into the first through hole 11 of the first connecting member 4 with a gap, and a cylindrical rubber bush 22 that is an elastic member is provided in the gap. The rubber bush 22 biases and holds the restriction rod 9 via the extended end portion 21 so as to be the same as the axis of the first connecting member 4 and the axis of the drive shaft 2. Thereby, the movement of the restriction rod 9 can be restricted to the range of the compression deformation of the rubber bush 22 while allowing the movement of the restriction rod 9 with respect to the first connecting member 4. In the present embodiment, the rubber bush 22 is employed as the elastic member. However, the present invention is not limited to this. For example, although not illustrated, a coil spring is provided in the gap between the extended end portion 21 and the first through hole 11. You may arrange | position radially.

  As shown in FIGS. 1 and 2, the flange portion 20 of the restriction rod 9 is held by a pair of holding blocks 24 fixed to the lower end surface of the first connecting member 4 by bolts 23 (shown in FIG. 2). The holding block 24 is formed with a receiving portion 25 that holds the flange portion 20 with play, and allows the movement of the restriction rod 9 with respect to the first connecting member 4 while allowing movement of the restriction rod 9. The play range can be regulated. Further, since the flange portion 20 of the restriction rod 9 is held by the receiving portion 25 of the holding block 24, even if the first elastic plate 7 or the second elastic plate 8 is damaged, the portion on the driven shaft 3 side is driven. It can prevent falling from the shaft 2 side.

  In addition, the lower end portion of the base portion 18 of the restriction rod 9 is inserted into the second through hole 16 of the second connecting member 5, and the large diameter portion 26 whose diameter is expanded to the outer periphery along the lower end surface of the second connecting member 5. Is formed. The restriction rod 9 has a large-diameter portion 26 fixed to the second connecting member 5 by a screw 27, and the bolt shaft 19 inside the restriction rod 9 is connected to the driven shaft 3 in a loose manner. .

  According to the flexible shaft joint 1 configured as described above, the rotation of the drive shaft 2 is transmitted to the driven shaft 3 on the machining tool side, and at this time, the axis of the drive shaft 2 and the axis of the driven shaft 3 are slightly changed. When they do not match, the displacement is absorbed by the elastic deformation of the first elastic plate 7 and the second elastic plate 8, and the rotation of the drive shaft 2 can be smoothly transmitted to the driven shaft 3. Further, even when the drive shaft 2 is moved in a direction intersecting the axis line in processing tool replacement or the like, a force that excessively deforms the first elastic plate 7 or the second elastic plate 8 is applied accordingly. Since the deformation of the first elastic plate 7 and the second elastic plate 8 is restricted within the allowable range by the restriction rod 9, damage to the first elastic plate 7 and the second elastic plate 8 can be reliably prevented, The high rotation transmission accuracy by the flexible shaft coupling 1 can be maintained for a long time.

Cross-sectional explanatory drawing which shows the flexible shaft coupling of one Embodiment of this invention. II-II sectional view explanatory drawing of FIG. Explanatory drawing which shows the processing apparatus which employ | adopted the conventional flexible shaft coupling. Explanatory sectional drawing which shows the conventional flexible shaft coupling.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Deflection shaft coupling, 2 ... Drive shaft, 3 ... Driven shaft, 4 ... 1st connection member, 5 ... 2nd connection member, 6 ... Partition member, 7 ... 1st elastic board, 8 ... 2nd elastic board, 9 ... Regulating rods 11, 16, 17 ... through holes, 20 ... collars, 22 ... rubber bushes (elastic members), 25 ... receiving parts.

Claims (3)

A first connecting member to which the drive shaft is connected; a second connecting member which is disposed away from the first connecting member in the axial direction of the drive shaft and to which the driven shaft is connected; and the first connecting member and the first connecting member A partition member disposed between the two connecting members, and the first connecting member and the partition member disposed in parallel with each other, each one end being connected to the first connecting member and each other being A pair of first elastic plates connected to the partition member, and the partition member and the second connection member are arranged in parallel to each other, each one end is connected to the partition member, and each other end is the second A flexible shaft coupling comprising a pair of second elastic plates coupled to a coupling member, wherein the second elastic plate is disposed so as to face a direction perpendicular to the first elastic plate;
A through hole penetrating in the axial direction of the drive shaft is formed in each of the first connecting member, the partition member, and the second connecting member,
The first connecting member, the partition member, and the second connecting member are inserted through the through holes with a gap between them, and the first elastic plate and the second elastic plate are elastic. A flexible shaft coupling comprising a restriction rod for restricting deformation to a predetermined deformation amount.   At least one of the through hole of the first connecting member and the through hole of the second connecting member is attached to the gap between the through hole and the restricting rod, and the restricting rod is attached to the same axis as the drive shaft. 2. The flexible shaft coupling according to claim 1, further comprising an elastic member for holding the force.   The restriction rod includes a flange portion that protrudes to an outer periphery located on the side of at least one of the first connection member and the second connection member, and the connection member has play in the flange portion. The flexible shaft coupling according to claim 1, further comprising a receiving portion that holds the bent shaft.

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