JP6047815B2 - Universal shaft joint and manufacturing method thereof - Google Patents

Description

  The present invention relates to a universal shaft joint including a cylindrical hub provided with a shaft hole at the center for mounting a shaft on both sides of an intermediate body, and a method for manufacturing the same.

  As shown in FIGS. 5A and 5B, in this type of universal shaft joint 100, a pair of hubs 101 </ b> R and 101 </ b> L is provided with a slot 103 that extends from the shaft hole 122 to the outer diameter, and is orthogonal to the slot 103. Then, the shaft fastening bolt 104 is tightened to narrow the interval of the slit 103 and the shaft hole 122 is reduced in diameter, thereby fastening the shafts J1 and J2 to the shaft hole 122. Intermediate leaf springs 152 disposed on both sides of the spacer 151 are attached to the opposing end surfaces of the pair of hubs 101R and 101L with fixing bolts 153 at a predetermined interval, and between the two shafts fastened to the hubs 101R and 101L. Torque can be transmitted while allowing declination and eccentricity.

JP 2002-372068 A JP 2007-232137 A

  However, in the conventional universal shaft joint 100, when the shaft fastening bolt 104 is tightened, the entire peripheral wall 121 of the hub 101R, 101L is deformed, and accordingly, the intermediate leaf spring 152 is subjected to stress from the attachment portion with the hub 101R, 101L. In some cases, it deformed. For this reason, the inherent flexibility of the intermediate leaf spring 152 is not sufficiently exhibited, which causes problems in torque transmission between the two shafts, and lowers the durability of the intermediate leaf spring 152. Further, since the slits 103 are formed on the outer peripheral surfaces of the hubs 101R and 101L, wind noise may be generated from the slits 103 on the outer peripheral surface of the hub when the shafts J1 and J2 are rotated at high speed, which may cause noise. .

  The present invention has been made in view of the above circumstances, and has a novel structure that allows the shaft to be firmly fixed to the shaft hole without deforming the entire peripheral wall of the hub and does not generate wind noise from the outer peripheral surface of the hub, and its manufacture. A method is provided.

The universal shaft joint according to the present invention is
In a universal shaft joint provided with a cylindrical hub provided with a shaft hole at the center on both sides of the intermediate body,
In the hub, a cutout groove inserted in the axial direction on the peripheral wall around the shaft hole is formed so as to extend from the shaft hole in the outer diameter direction and bend near the outer diameter so that the terminal end remains in the peripheral wall, and is surrounded by the cutout groove. A rocking piece is formed by the peripheral wall portion,
The swing piece is configured to swing toward the shaft hole side by the tightening force of the shaft fastening bolt screwed in the circumferential direction of the hub and fasten the shaft to the shaft hole.
The intermediate is attached to a peripheral wall portion other than the swing piece ,
The cutout groove includes a first groove portion extending from the shaft hole in the outer diameter direction, a second groove portion extending in the circumferential direction continuously from the first groove portion, and extending toward the shaft hole side continuously from the second groove portion and terminating at a peripheral wall. It is formed with the 3rd groove part which stays in .
In the specification of the cutout groove, “near the outer diameter” means that the outer peripheral side of the hub peripheral wall is on the outer diameter side.

  According to the above configuration, when the shaft fastening bolt is fastened at the time of shaft fastening, only the swing piece that is a part of the peripheral wall of the hub swings, and the entire peripheral wall is not deformed. Therefore, by attaching the intermediate body to the peripheral wall portion other than the swing piece, the intermediate body is prevented from being deformed by receiving stress from the attachment portion with the hub as the shaft fastening bolt is tightened. In addition, tightening the shaft fastening bolt only involves swinging the swinging piece, so the tightening torque of the shaft fastening bolt is light, yet the tightening torque to the shaft to be installed in the shaft hole is high, and the shaft is strengthened. Can be fixed. Further, since the cutout groove for forming the swing piece is not formed on the outer peripheral surface of the hub, the cutout groove does not generate wind noise such as a slit in a conventional universal shaft joint.

The universal shaft joint according to the present invention is
In a universal shaft joint provided with a cylindrical hub provided with a shaft hole at the center on both sides of the intermediate body,
In the hub, a cutout groove inserted in the axial direction on the peripheral wall around the shaft hole is formed so as to extend from the shaft hole in the outer diameter direction and bend near the outer diameter so that the terminal end remains in the peripheral wall, and is surrounded by the cutout groove. A rocking piece is formed by the peripheral wall portion,
The swing piece is configured to swing toward the shaft hole side by the tightening force of the shaft fastening bolt screwed in the circumferential direction of the hub and fasten the shaft to the shaft hole.
The intermediate is attached to a peripheral wall portion other than the swing piece,
The cutout groove is formed so that the forward groove portion extending in the outer diameter direction from the shaft hole is inclined or bent so as to approach the return groove portion turned back near the outer diameter on the outer diameter side.
That is, the forward groove portion may be formed to be linearly inclined or bent in a U shape or the like so as to approach the return groove portion on the outer diameter side.
Accordingly, when the swinging piece swings as compared with the case where the forward groove portion is formed in parallel with the return groove portion, the swinging piece moves more obliquely in the forward groove portion and the groove width is narrowed. Therefore, even if the groove width of the forward groove portion is narrow, the swing range of the swing piece is ensured and the shaft can be firmly fastened.

It is desirable that the end of the cutout groove is connected to an R-shaped portion that is larger than the cutout groove width. For example, a relief hole of a fixing bolt for fixing the intermediate body is used as the R-shaped portion.
Thereby, the load accompanying the swing of the swing piece is not concentrated at the end of the cutout groove, and cracks at the end of the cutout groove can be prevented.

The intermediate body preferably includes an intermediate leaf spring that is attached to the opposite end surface of the peripheral wall portion other than the swing piece with a predetermined interval with respect to the hub.
Thus, the peripheral wall portion excluding the swing piece is not deformed when the swing piece swings, and therefore, the intermediate leaf spring is not affected by the stress accompanying the swing of the swing piece. Therefore, the intermediate leaf spring does not bend and deform with the tightening of the bolt for fastening the shaft at the hub, and the inherent flexibility of the intermediate leaf spring is sufficiently exerted to smoothly transmit torque between the two shafts. Can do. In addition, the durability of the intermediate leaf spring is also improved.
It is desirable that the portion including the swing piece from the inlet opening on the outer peripheral surface of the hub is a counterbore hole for immersing the head of the bolt for fastening the shaft. In this case, when the shaft fastening bolt is tightened, the swinging piece is pressed by the head of the shaft fastening bolt and swings to the shaft hole side to fasten the shaft in the shaft hole.

As a method of manufacturing the universal shaft joint, the hub is formed by drilling a single plate to form a hole serving as the shaft hole, and performing groove processing using the hole as a base point to form the cut groove. The rocking piece is formed by forming the groove, and subsequently, the same machine that has been subjected to the groove processing is cut out according to the outer shape of the peripheral wall of the hub .
The drilling can be performed with a drill machine or the like. You may form simultaneously the screw hole for fixing bolts for fixing with an intermediate body in this drilling process, and the hole part used as the escape hole which escapes the head of a fixing bolt. Moreover, the said groove | channel processing and cutting processing can be performed with a wire cutting machine, a water jet processing machine, etc.

  As described above, according to the universal shaft joint according to the present invention, the swing piece that is a part of the peripheral wall of the hub is swung and the shaft is fastened to the shaft hole. However, the intermediate body is not deformed, and the shaft can be firmly fixed to the shaft hole by the swing piece. Therefore, torque transmission between the two shafts fastened to the hubs on both sides via the intermediate body can be performed smoothly. In addition, since the cutout groove for forming the swing piece is not provided on the outer peripheral surface of the hub, no wind noise is generated during high-speed rotation.

It is a figure which shows the structure of the universal shaft coupling by embodiment, The figure (a) is a left view, The figure (b) is a front view. It is a top view for demonstrating an example of the manufacturing method of the hub in the universal shaft coupling by embodiment, The figure (a) is a figure which shows the state which gave the drilling process to the metal plate, The figure (b) FIG. 4 is a view showing a state in which grooving and cutting are performed. It is a side view which shows the various modifications of the universal shaft coupling by embodiment. It is a side view which shows the various modifications of the universal shaft coupling by embodiment. It is a figure which shows the structure of the conventional universal shaft coupling, The figure (a) is a left view, The figure (b) is a front view.

Hereinafter, embodiments will be described with reference to the drawings.
As shown in FIG. 1, the universal shaft joint 1 of the embodiment is disposed between a pair of first hub 2R and second hub 2L that fasten shafts J1 and J2, and between the first hub 2R and second hub 2L. Intermediate body 5.

  The intermediate body 5 includes a cylindrical spacer 51 and intermediate leaf springs 52 disposed on both end surfaces of the spacer 51. The spacer 51 can be formed of a metal such as aluminum or a resin such as engineering plastic, and is formed in a cylindrical shape having a through hole (not shown) through which a shaft can be inserted at the center. The spacer 51 is connected to the first hub 2R and the second hub 2L via intermediate leaf springs 52 on both end faces, and transmits torque between the two shafts fastened to the first hub 2R and the second hub 2L. Ensure torsional rigidity at the time.

  The intermediate leaf spring 52 is composed of a leaf spring in which a plurality of thin plates made of metal such as stainless steel or plastic are overlapped, and is formed in an annular plate shape having a circular opening (not shown) at the center. Has been. The intermediate leaf spring 52 is attached to the end face of the spacer 51 via a washer 54 at two positions 180 degrees and via a washer 54 at two positions 180 degrees perpendicular thereto. It is attached to the end faces of the hubs 2R and 2L. That is, the intermediate leaf spring 52 is attached to each of the first hub 2R, the second hub 2L, and the spacer 51 with a predetermined interval, and is flexibly bent in the direction perpendicular to the plate surface, thereby A declination or eccentricity between the two shafts fastened to the hub 2R and the second hub 2L is allowed.

  Since the first hub 2R and the second hub 2L are formed in the same shape, they will be referred to as “hub 2” as appropriate. The hub 2 can be formed of a metal such as aluminum or a resin such as engineering plastic. A shaft hole 22 for mounting the shafts J1 and J2 is provided at the center, and the hub 2 is formed in a cylindrical shape as a whole. The shaft holes 22 of the first hub 2R and the second hub 2L are formed with dimensions corresponding to the shaft diameters of the shafts J1 and J2 to be fastened.

  When fastening the shaft J to the shaft hole 22, the hub 2 swings toward the shaft hole 22 by the tightening force of the shaft fastening bolt 4 on the peripheral wall 21 around the shaft hole 22 and fastens the shaft J to the shaft hole 22. An oscillating piece 3 is provided. That is, the swing piece 3 is formed by a U-shaped cutout groove 30 cut from the shaft hole 22 in the peripheral wall 21, and the peripheral wall 21 surrounded by the cutout groove 30. The cutout groove 30 is aligned with the center line M, extends from the shaft hole 22 in the outer diameter direction and extends near the outer diameter, and the second groove section 32 extends in the circumferential direction continuously to the first groove section 31. The third groove portion 33 is formed of a third groove portion 33 that extends continuously to the shaft hole 22 side and extends to the vicinity of the shaft hole 22 in parallel with the second groove portion 32. Therefore, the oscillating piece 3 is constituted by a peripheral wall 21 portion cut by the cutout groove 30 so as to extend in parallel with the center line M in one peripheral wall region with the center line M of the hub 2 as a boundary. In the specification of the cutout groove 30 described above, “near the outer diameter” means that it is on the outer diameter side of the intermediate position in the radial direction of the hub peripheral wall 21, and “near the shaft hole” means the radial direction of the hub peripheral wall 21. This means that it is on the shaft hole 22 side with respect to the intermediate position.

  The peripheral wall 21 of the hub 2 is provided with relief holes 23 penetrating in the axial direction in order to escape the heads of the fixing bolts 53 for attaching the intermediate leaf springs 52 to the spacer 51 side at two positions of 180 degrees. The end of the cutout groove 30, that is, the end of the third groove portion 33 is connected to one escape hole 23. The size of the relief hole 23 is larger than the groove width of the cutout groove 30 and constitutes an R-shaped portion connected to the end of the cutout groove 30. Accordingly, the swing piece 3 can swing toward the shaft hole 22 with the peripheral wall 21 between the relief hole 23 and the shaft hole 22 connected to the end of the cutout groove 30 as the swing center. The load accompanying the swinging is not concentrated at the end of the cutout groove 30, and cracks at the end of the cutout groove 30 can be prevented. The end of the cutout groove 30 may be fastened by the peripheral wall 21 without being connected to the R-shaped portion such as the escape hole 23.

  Further, the peripheral wall 21 of the hub 2 has screw holes 27 for fixing bolts 53 for attaching the intermediate leaf springs 52 to the hub 2 side at two positions 180 degrees at positions moved 90 degrees circumferentially from the escape holes 23. It is provided penetrating in the direction. That is, the intermediate leaf spring 52 is attached to the peripheral wall 21 other than the swing piece 3 on the end surface of the peripheral wall 21 of the hub 2.

  Bolt holes 24 are provided in the peripheral wall 21 of the hub 2 so as to cross the swing piece 3 and penetrate in the circumferential direction. The bolt hole 24 is provided orthogonal to the center line M of the hub 2. The side including the swing piece 3 is a bolt insertion hole 25 through which the shaft fastening bolt 4 is inserted, and the side not including the swing piece 3. Is a screw hole 26 into which the shaft fastening bolt 4 is screwed. Further, the bolt insertion hole 25 is a counterbore hole into which the head portion of the shaft fastening bolt 4 is inserted at a portion including the swing piece 3 from an inlet opening on the outer peripheral surface of the hub 2. Therefore, when the shaft fastening bolt 4 is screwed into the bolt hole 24 and tightened, the swing piece 3 is pressed by the head of the shaft fastening bolt 4 and the end of the cutout groove 30 is connected. The shaft 21 is swung toward the shaft hole 22 with the peripheral wall 21 between the shaft hole 22 and the shaft hole 22 as a center, and the shaft J is fastened to the shaft hole 22.

  Thus, when the shaft fastening bolt 4 is fastened at the time of shaft fastening, only the swing piece 3 that is a part of the peripheral wall 21 of the hub 2 swings, and the entire peripheral wall 21 is not deformed. The intermediate leaf spring 52 is attached to the peripheral wall 21 portion excluding the swing piece 3, and the peripheral wall 21 portion to which the intermediate leaf spring 52 is attached is not deformed when the swing piece 3 swings. Therefore, the intermediate leaf spring 52 is not affected by any stress due to the swing of the swing piece 3. Therefore, the intermediate leaf spring 52 does not bend and deform as the shaft fastening bolt 4 is tightened in the hub 2, and the inherent flexibility of the intermediate leaf spring 52 is sufficiently exerted to transmit torque between the two shafts. It can be done smoothly. In addition, the durability of the intermediate leaf spring 52 is also improved.

  Further, the tightening of the shaft fastening bolt 4 only swings the rocking piece 3, so that the tightening torque of the shaft fastening bolt 4 is light and the tightening torque to the shaft J mounted in the shaft hole 22 is high. The shaft J can be firmly fixed. In particular, the swing piece 3 is provided in one peripheral wall 21 region with the center line M of the hub 2 as a boundary, and presses and swings toward the other peripheral wall 21 region side, so that the fastening torque to the shaft J is increased. can do.

  Furthermore, in the conventional universal shaft joint 100 (see FIG. 5), wind noise may be generated from the slit 103 formed on the outer peripheral surface of the hub during high-speed rotation. Since the groove 30 is not formed on the outer peripheral surface of the hub 2, wind noise as in the conventional universal shaft joint 100 is not generated from the cutout groove 30.

  As shown in FIG. 2, a manufacturing method of the hub is as follows. First, a metal plate P is drilled by a drilling machine corresponding to the plurality of hubs 2 to form shaft holes 22, relief holes 23 and screws. A plurality of hole portions 6 to be the holes 27 are formed (see FIG. 2A). In addition, the hole 6 corresponding to the screw hole 27 forms a screw groove later by tapping. Next, the oscillating piece 3 is formed by forming the cut groove 30 by performing the groove processing 7 using the wire cutting machine as a starting point with the hole portion 6 serving as the shaft hole 22 or the escape hole (R-shaped portion) 23. That is, since the hole 6 is formed first, the swing piece 3 can be formed easily and at low cost through the wire of the wire cutting machine with the hole 6 as a base point. Subsequently, a cutting process 8 is performed in accordance with the outer shape of the peripheral wall 21 of the hub 2 with a wire cutting machine (see FIG. 2B). Thereby, the prototype of the plurality of hubs 2 can be efficiently manufactured from one metal plate P. Note that the grooving 7 and the cutting 8 may be performed by a water jet processing machine, a laser processing machine, or the like. Thereafter, the hub 2 is manufactured by making bolt holes 24 of the shaft fastening bolts 4 on the obtained prototype.

In addition, this invention is not limited only to the said embodiment, A various change is possible within the range of the summary of this invention.
For example, as shown in FIG. 3 (a), the bolt hole 24 is tightened with the shaft fastening bolt 4 with the portion of the swing piece 3 as a screw hole 26 and the side not including the swing piece 3 as a bolt insertion hole 25. Thus, the swing piece 3 may be swung toward the shaft hole 22 by screwing the swing piece 3.

Further, as shown in FIG. 3B, the bolt hole 24 is formed by a screw hole 26 provided on the back side of the swing piece 3, and a hollow set (Imo screw) serving as the shaft fastening bolt 4 is formed in the screw hole 26. ) 41 may be screwed and the swing piece 3 may be pressed from behind to swing toward the shaft hole 22 side.
Further, as shown in FIG. 3B, the third groove portion 33 of the cutout groove 30 forms a groove portion 33 a that extends near the shaft hole 22 and parallel to the inner diameter of the shaft hole 22, so that the swing piece 3 swings. A wide range may be secured.

  Further, as shown in FIG. 3C, in the cutout groove 30, the first groove portion 31 (forward groove portion) extending from the shaft hole 22 in the outer diameter direction approaches the third groove portion 33 (return groove portion) on the outer diameter side. As such, it may be formed obliquely at a predetermined angle θ with respect to the center line M. According to this, referring to the enlarged portion at the bottom of FIG. 3 (c), when the shaft fastening bolt 4 is tightened from the direction orthogonal to the center line M, the first groove portion 31 is formed in parallel with the center line M. Compared to the case, in the first groove 31, the rocking piece 3 moves more obliquely to narrow the groove width. Therefore, even if the groove width W of the first groove 31 is small, the moving distance L becomes long and the rocking The swing range of the piece 3 is ensured widely, and the shaft J can be firmly fastened. In this case, the second groove 32 may not be provided, and the cutout groove 30 may be formed in a V shape. In addition, even if the first groove portion 31 (forward groove portion) is formed in a U-shape or the like so as to approach the third groove portion 33 (return groove portion) on the outer diameter side, the same effect as described above can be obtained. Can do.

  Further, as shown in FIG. 3D, the cutout groove 30 may be formed in a U shape. That is, the second groove portion 32 extending in the circumferential direction near the outer diameter is formed in an arc shape. Thereby, compared with the case where the cutout groove 30 is formed in a U-shape, the thickness of the peripheral wall 21 is ensured between the swing piece 3 and the hub outer diameter, that is, between the second groove portion 32 and the hub outer diameter. The strength of the peripheral wall 21 can be ensured.

As shown in FIG. 4, the swing piece 3 may be formed on one peripheral wall 21 side with the center line M as a boundary away from the center line M of the hub 2 (see FIG. 4A). Further, it may be formed widely across the center line M (FIG. 4B).
As shown in FIG. 4C, the end position of the cutout groove 30 is outside the intermediate position in the radial direction of the peripheral wall 21 as long as the swing piece 3 can swing to the shaft hole 22 side. You may arrange | position on the diameter side.
Further, as shown in FIG. 4 (d), the swinging pieces 3 are respectively formed on both sides of the peripheral wall 21 across the shaft hole 22 on the diagonal side, and the shafts are inserted into the bolt holes 24 corresponding to the swinging pieces 3. It is good also as a structure which fastens the bolt 4 for fastening and fastens the axis | shaft J. FIG.
Further, the intermediate body 5 may be configured by only the intermediate leaf spring 52 without providing the spacer 51.

DESCRIPTION OF SYMBOLS 1 Universal shaft coupling 2, 2R, 2L Hub 3 Oscillating piece 4 Shaft fastening bolt 5 Intermediate body 21 Peripheral wall 22 Shaft hole 23 Relief hole (R-shaped part)
30 cutout groove 31 first groove portion 32 second groove portion 33 third groove portion 51 spacer 52 intermediate leaf springs J, J1, J2 shafts

Claims (6)

In a universal shaft joint provided with a cylindrical hub provided with a shaft hole at the center on both sides of the intermediate body,
In the hub, a cutout groove inserted in the axial direction on the peripheral wall around the shaft hole is formed so as to extend from the shaft hole in the outer diameter direction and bend near the outer diameter so that the terminal end remains in the peripheral wall, and is surrounded by the cutout groove. A rocking piece is formed by the peripheral wall portion,
The swing piece is configured to swing toward the shaft hole side by the tightening force of the shaft fastening bolt screwed in the circumferential direction of the hub and fasten the shaft to the shaft hole.
The intermediate is attached to a peripheral wall portion other than the swing piece ,
The cutout groove includes a first groove portion extending from the shaft hole in the outer diameter direction, a second groove portion extending in the circumferential direction continuously from the first groove portion, and extending toward the shaft hole side continuously from the second groove portion and terminating at a peripheral wall. A universal shaft joint formed with a third groove portion that remains inside . In a universal shaft joint provided with a cylindrical hub provided with a shaft hole at the center on both sides of the intermediate body,
In the hub, a cutout groove inserted in the axial direction on the peripheral wall around the shaft hole is formed so as to extend from the shaft hole in the outer diameter direction and bend near the outer diameter so that the terminal end remains in the peripheral wall, and is surrounded by the cutout groove. A rocking piece is formed by the peripheral wall portion,
The swing piece is configured to swing toward the shaft hole side by the tightening force of the shaft fastening bolt screwed in the circumferential direction of the hub and fasten the shaft to the shaft hole.
The intermediate is attached to a peripheral wall portion other than the swing piece,
The cutout groove is a universal shaft joint formed so that an outward groove portion extending in the outer diameter direction from the shaft hole is inclined or bent so that the return groove portion turned back near the outer diameter approaches on the outer diameter side. The universal shaft joint according to claim 1 or 2 ,
A universal shaft joint in which the end of the cutout groove is connected to an R-shaped portion larger than the cutout groove width. In the universal shaft coupling according to any one of claims 1 to 3,
The said intermediate body is a universal joint provided with the intermediate leaf | plate spring attached with a predetermined space | interval to the opposing end surface in peripheral wall parts other than a rocking | fluctuation piece with respect to a hub. In the universal shaft coupling according to any one of claims 1 to 4,
A universal shaft joint in which a portion including a swinging piece from an inlet opening on the outer peripheral surface of the hub is a counterbore hole into which a head portion of a shaft fastening bolt is inserted . It is a manufacturing method of the universal shaft coupling according to any one of claims 1 to 5 ,
The hub is formed by drilling a single plate to form a hole serving as the shaft hole, and by forming a groove by using the hole as a base point to form the cutout groove. Is formed , and subsequently, the same machine that has been subjected to the grooving is cut out according to the outer shape of the peripheral wall of the hub .

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