JP2006348991A - Transmission shaft expansion joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce production cost by simplifying structure in a transmission shaft expansion joint. <P>SOLUTION: This transmission shaft expansion joint comprises a first connection member 1 connected to a first transmission shaft 8 to be rotatable integrally with each other, a second connection member 2 connected to a second transmission shaft 18 with the rotating axis 18a same as the rotating axis 8a of the first rotating shaft 8 to be rotated integrally with each other, and a rotation transmission means M transmitting rotation between the first connection member 1 and the second connection member 2. The rotating transmission means M comprises two interlocking shafts 11 formed on one connection member 1 and two shaft holes 20 formed in the other connection member 2 at positions eccentric to the rotating axes 8a and 18a of the transmission shafts 8 and 18. The interlocking shafts 11 are inserted into the shaft holes 20 so that the interlocking shafts 11 and the shaft holes 20 can be moved relative to each other in the direction of the rotating axes 8a and 18a together with the first connection member and the second connection member 2. Since the structure of the transmission shaft expansion joint can be simplified, the production cost can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a transmission shaft expansion joint in which a first transmission shaft and a second transmission shaft having the same rotation center line can be moved relative to each other in the direction of the rotation center line.

  Conventionally, in this type of transmission shaft expansion joint, a first coupling member coupled to the first transmission shaft so as to be integrally rotatable, and a second coupling shaft having the same rotation center line as the first transmission shaft. Rotational transmission means is provided for transmitting rotation to and from a second connecting member connected to the transmission shaft so as to be integrally rotatable. As this rotation transmission means, for example, a spline structure or the like is employed, and a spline shaft provided on one connecting member is inserted into a shaft hole provided on the other connecting member.

  The spline structure is effective in that a large rotational force can be transmitted. However, since it is necessary to form irregularities on the outer periphery of the spline shaft and the inner periphery of the shaft hole, the structure becomes complicated and the manufacturing cost increases. There's a problem.

  An object of the present invention is to reduce the manufacturing cost by simplifying the structure of a transmission shaft expansion joint.

The present invention will be described with reference to the reference numerals of the drawings (FIGS. 1 to 6) of the embodiments described later.
The transmission shaft expansion joint according to the invention of claim 1 is configured as follows.
In this transmission shaft expansion joint, the first coupling member 1 coupled to the first transmission shaft 8 so as to be integrally rotatable, and the second coupling coupled to the second transmission shaft 18 so as to be integrally rotatable. A member 2 and a rotation transmission means M that transmits rotation between the first connecting member 1 and the second connecting member 2 are provided. For example, the first connection member 1 has a connection hole 7 into which the first transmission shaft 8 is inserted, and the second connection member 2 has a connection hole 17 into which the second transmission shaft 18 is inserted. The center line 7b of the connection hole 7 (the rotation center line 8a of the first transmission shaft 8) and the center line 17b of the connection hole 17 (the rotation center line 18a of the second transmission shaft 18) coincide with each other. ing. The rotation transmission means M is an eccentric position of the transmission shafts 8 and 18 with respect to the rotation center lines 8a and 18a, and is an interlock provided in one of the first connection member 1 and the second connection member 2. The shaft 11 and the shaft hole 20 provided in the other connecting member 2 are provided. The interlocking shaft 11 is inserted into the shaft hole 20, and the interlocking shaft 11 and the shaft hole 20 are connected to the first connecting member 1 and The second connecting member 2 and the second connecting member 2 can be moved relative to each other in the direction of the rotation center lines 8a and 18a. The interlocking shaft 11 has a relatively simple shape such as a solid shaft or a hollow shaft. However, the transmission shafts 8 and 18 are not limited to the solid shaft or the hollow shaft, but have various shapes. It may be.

  The transmission shaft expansion joint according to the invention of claim 2 is different from the invention of claim 1 in that the rotational transmission means M includes a plurality of interlocking shafts 11 and a plurality of shaft holes 20. Not only the interlocking shaft 11 is provided in one connecting member 1 and the shaft hole 20 is provided only in the other connecting member 2, but the interlocking shaft and the shaft hole are provided in one connecting member and the shaft is provided in the other connecting member. A hole and an interlocking shaft may be provided.

  In the first and second aspects of the invention, the rotation transmission means M can be simply inserted by inserting the interlocking shaft 11 and the shaft hole 20 disposed at an eccentric position with respect to the rotation center lines 8a and 18a of the transmission shafts 8 and 18. Structure.

  In the invention of claim 3 premised on the invention of claim 2, the interlocking shafts 11 are equidistant in the rotational direction X on the concentric circle C centering on the rotation center lines 8a, 18a of the transmission shafts 8, 18. The shaft holes 20 are arranged side by side at equal intervals α in the rotation direction X on concentric circles C centering on the rotation center lines 8a, 18a of the transmission shafts 8, 18. In invention of Claim 3, transmission of a rotational force can be performed smoothly.

  In the invention of claim 4 based on the invention of claim 2 or claim 3, the interlocking shaft 11 is detachably inserted into the support hole 10 provided in the connecting member 1, for example. In the invention of claim 4, the interlocking shaft 11 can be easily provided on the connecting member 1.

  In the fifth invention based on the invention of claim 3, the number of the interlocking shafts 11 is two, three, or four, and the number of the shaft holes 20 is the same as the number of the interlocking shafts 11. In the fifth invention, the connecting members 1 and 2 provided with the interlocking shaft 11 and the shaft hole 20 can be simplified.

  In the invention of any one of claims 1 to 4 or the sixth invention based on the fifth invention, the outer peripheral surface 11a of the interlocking shaft 11 is a rotation center line 8a of the transmission shafts 8 and 18. , 18a is formed in a circular shape on a cross section orthogonal to the shaft hole 20, and the inner peripheral surface 20a of the shaft hole 20 is formed in a circular shape on a cross section orthogonal to the rotation center lines 8a, 18a of the transmission shafts 8, 18. Yes. Further, when the plurality of interlocking shafts 11 and the plurality of shaft holes 20 are provided as in the invention of claim 2, the diameters of the outer peripheral surfaces 11a of the respective interlocking shafts 11 are set to be equal to each other, The diameters of the inner peripheral surfaces 20a of the shaft holes 20 are set to be the same. In the sixth invention, the shapes of the interlocking shaft 11 and the shaft hole 20 provided in the connecting members 1 and 2 can be simplified.

  The present invention can simplify the structure of the transmission shaft expansion joint and reduce the manufacturing cost.

First, a transmission shaft expansion joint according to a first embodiment of the present invention will be described with reference to FIGS.
The transmission shaft expansion joint shown in FIGS. 3 and 4 includes a first connecting member 1 shown in FIG. 1 and a second connecting member 2 shown in FIG.

  In the first connecting member 1 shown in FIG. 1, a cylindrical hub 3 formed of aluminum, stainless steel or the like has a circular outer peripheral surface 4 and circular inner and outer end surfaces 5, 6, and this inner and outer surfaces. A connecting hole 7 having a circular inner peripheral surface 7 a is provided between the inner and outer end surfaces 5, 6 at the center of both end surfaces 5, 6. As shown in FIGS. 3 and 4, the first transmission shaft 8 is inserted into the connecting hole 7 from the outer end face 6 side and is connected to the hub 3 by a connecting screw 9 so as to be integrally rotatable. Two support holes 10 having a circular inner peripheral surface 10a are connected to the rotation center line 8a at eccentric positions with respect to the rotation center line 8a of the first transmission shaft 8 on the inner and outer end faces 5, 6 of the hub 3. On the concentric circle C as the center, they are arranged in the rotational direction X with a circumferential angle α (interval) of 180 degrees from each other and penetrated between the inner and outer end faces 5 and 6. The diameters of the inner peripheral surfaces 10a of the support holes 10 are set to be the same.

  In the first connecting member 1, an interlocking shaft 11 having a circular outer peripheral surface 11 a is inserted into both support holes 10 of the hub 3 and is connected to the hub 3 by a set screw 12 so as to be integrally rotatable. . The interlocking shaft 11 is also formed of aluminum or stainless steel. Both the interlocking shafts 11 protrude from the inner end surface 5 by a predetermined length L, and have a center line 11b parallel to the center line 7b of the connecting hole 7 (the rotation center line 8a of the first transmission shaft 8). They are arranged on a concentric circle C centered on the center line 8a in the rotational direction X with a circumferential angle α (interval) of 180 degrees. The diameter of the outer peripheral surface 11a of both the interlocking shafts 11 and the protruding length L are set to be the same.

  In the second connecting member 2 shown in FIG. 2, a cylindrical hub 13 formed of aluminum, stainless steel or the like has a circular outer peripheral surface 14 and circular inner and outer end surfaces 15 and 16, and this inner and outer surfaces. A connecting hole 17 having a circular inner peripheral surface 17 a is provided between the inner and outer end surfaces 15, 16 at the center of both end surfaces 15, 16. As shown in FIGS. 3 and 4, a second transmission shaft 18 is inserted into the connection hole 17 from the outer end surface 16 side and is connected to the hub 13 by a connection screw 19 so as to be integrally rotatable. Two shaft holes 20 each having a circular inner peripheral surface 20a define the rotation center line 18a at an eccentric position with respect to the rotation center line 18a of the second transmission shaft 18 on the inner and outer end faces 15, 16 of the hub 13. On the concentric circle C as the center, they are arranged in the rotational direction X with a circumferential angle α (interval) of 180 degrees from each other and penetrated between the inner and outer end faces 15 and 16. The diameters of the inner peripheral surfaces 20a of the shaft holes 20 are set to be the same. A bearing cylinder 21 having a circular inner peripheral surface 21a is fitted into both shaft holes 20 so as to be exposed on the inner end surface 15 side. The bearing cylinders 21 in the shaft holes 20 have a center line 21b parallel to the center line 17b of the connecting hole 17 (the rotation center line 18a of the second transmission shaft 18).

  As shown in FIGS. 3 and 4, in the rotation transmission means M that transmits the rotation between the first connecting member 1 and the second connecting member 2, the inner end surface 5 of the hub 3 and the inner end surface of the hub 13 are used. 15, each interlocking shaft 11 is inserted into each shaft hole 20, and each of the interlocking shafts 11 and each shaft hole 20 together with the first connecting member 1 and the second connecting member 2 are transmission shafts. 8 and 18 can be moved relative to each other in the direction of the rotation center lines 8a and 18a. Incidentally, the center line 7b of the connecting hole 7 in the hub 3 of the first connecting member 1 (the rotation center line 8a of the first transmission shaft 8) and the center line 17b of the connecting hole 17 in the hub 13 of the second connecting member 2 are used. (The rotation center line 18a of the second transmission shaft 18) coincides with each other in the misalignment error range. For example, when the first transmission shaft 8 is rotated forward by an electric motor (not shown) in the state shown in FIG. 3, the second transmission shaft 18 is rotated forward by the transmission shaft expansion joint and a male and female screw mechanism (not shown). ) In the direction of the rotation center line 18a, and the inner end surface 15 of the hub 13 is separated from the inner end surface 5 of the hub 3 to be in the state shown in FIG. Further, when the first transmission shaft 8 is reversely rotated by the electric motor in the state shown in FIG. 4, the second transmission shaft 18 is reversely rotated by the transmission shaft expansion joint, and the rotation center line is formed by the male and female screw mechanism (not shown). 18a, the inner end surface 15 of the hub 13 approaches the inner end surface 5 of the hub 3, and the state shown in FIG. Therefore, this rotational transmission means M is advantageous when the relative movement stroke S between the first transmission shaft 8 and the second transmission shaft 18 is large.

  In the second embodiment shown in FIG. 5, the three interlocking shafts 11 in the first connecting member 1 have a circumference of 120 degrees in the rotation direction X on a concentric circle C centering on the rotation center line 8 a of the transmission shaft 8. They are arranged with an angle α (interval) therebetween, and in the second connecting member 2, the three shaft holes 20 are 120 in the rotational direction X on a concentric circle C centering on the rotational center line 8 a of the transmission shaft 8. They are arranged at a circumferential angle α (interval).

  In the third embodiment shown in FIG. 6, the four interlocking shafts 11 in the first connecting member 1 have a circumference of 90 degrees in the rotation direction X on a concentric circle C centering on the rotation center line 8 a of the transmission shaft 8. The four shaft holes 20 in the second connecting member 2 are arranged in a rotational direction X on a concentric circle C centering on the rotation center line 8 a of the transmission shaft 8. They are arranged at a circumferential angle α (interval).

(A) is a side view which shows only a 1st connection member in the transmission shaft expansion joint concerning 1st embodiment, (b) is a front view similarly, (c) is sectional drawing of (a). . (A) is a side view which shows only a 2nd connection member in the transmission shaft expansion joint concerning 1st embodiment, (b) is a front view similarly, (c) is sectional drawing of (a). . (A) is a side view which shows the state which the 1st connection member and the 2nd connection member approached in the transmission shaft expansion joint concerning 1st embodiment, (b) is sectional drawing of (a). . (A) is a side view which shows the state which the 1st connection member and the 2nd connection member spaced apart in the transmission shaft expansion joint concerning 1st embodiment, (b) is sectional drawing of (a). . (A) is a front view which shows only a 1st connection member in the transmission shaft expansion joint concerning 2nd embodiment, (b) is only the 2nd connection member in the transmission shaft expansion joint concerning 2nd embodiment. FIG. (A) is a front view which shows only the 1st connection member in the transmission shaft expansion joint concerning 3rd embodiment, (b) is only the 2nd connection member in the transmission shaft expansion joint concerning 3rd embodiment. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st connection member, 2 ... 2nd connection member, 8 ... 1st transmission shaft, 8a ... Rotation center line, 10 ... Support hole, 11 ... Interlocking shaft, 18 ... 1st transmission shaft, 18a ... Rotation center line, 20 ... shaft hole, α ... circumferential angle (interval), C ... concentric circle, X ... rotation direction.

Claims (4)

A first coupling member coupled to the first transmission shaft so as to be integrally rotatable; a second coupling member coupled to the second transmission shaft so as to be integrally rotatable; In a transmission shaft expansion joint provided with rotation transmission means for transmitting rotation between two connecting members,
The rotation transmission means includes an interlocking shaft provided in one connecting member and a shaft hole provided in the other connecting member at an eccentric position with respect to the rotation center line of the transmission shaft, and the interlocking shaft is inserted into the shaft hole. The transmission shaft expansion joint is characterized in that the interlocking shaft and the shaft hole can be relatively moved together with the first connecting member and the second connecting member in the direction of the rotation center line. A first coupling member coupled to the first transmission shaft so as to be integrally rotatable; a second coupling member coupled to the second transmission shaft so as to be integrally rotatable; In a transmission shaft expansion joint provided with rotation transmission means for transmitting rotation between two connecting members,
The rotation transmission means includes a plurality of interlocking shafts provided in one connecting member and a plurality of shaft holes provided in the other connecting member at an eccentric position with respect to the rotation center line of the transmission shaft, A transmission shaft that is inserted into a shaft hole so that each interlocking shaft and each shaft hole can be relatively moved together with the first connecting member and the second connecting member in the direction of the rotation center line. Expansion joints. The interlocking shafts are arranged in parallel on the concentric circle centered on the rotation center line of the transmission shaft at equal intervals in the rotation direction, and the shaft holes rotate in the concentric circle centered on the rotation center line of the transmission shaft. The transmission shaft expansion joint according to claim 2, wherein the transmission shaft expansion joints are arranged in parallel at equal intervals. The transmission shaft expansion joint according to claim 2 or 3, wherein the interlocking shaft is inserted into a support hole provided in a connecting member.

Images