JP2010127436A - Phase adjusting mechanism of drive shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the phase adjusting mechanism which can carry out the adjusting work of the output shaft phase to the input shaft phase easily. <P>SOLUTION: The phase adjusting mechanism of a driving shaft includes the first clutch fixed to the output shaft 20, the second clutch geared with the first clutch, the adjustment part rotating the first clutch in the circumferential direction to the input shaft, the bearing part supporting an adjustment part rotatably in the circumferential direction to the second clutch while being interposed between the adjustment part and the second clutch, and the fixing means fixing the adjustment part and the first clutch. The fixing means has the bolt 36 which penetrates the adjustment part and the first clutch and the first nut 38 which sandwiches the adjustment part and the first clutch with the bolt 36 while being fixed to the bolt 36. The first nut 38 is formed in a shape of ring which encloses the outside of the output shaft 20 as a turning prevention means to prevent the turning with the bolt 36. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a drive shaft having a first helical spline provided on the input shaft and a second helical spline provided on the output shaft and meshing with the first helical spline. The present invention relates to a drive shaft phase adjustment mechanism that adjusts the phase of an output shaft relative to the phase of an input shaft by changing the position of the helical spline in the axial direction.

  For example, there are deformed bars and threaded bars that add value to steel bars for use as structural materials for construction. These deformed bars and threaded bars have protrusions P1 and P2 called nodes as shown in FIG. These protrusions P1 and P2 are formed by a rolling mill. Specifically, the protrusions P1 and P2 are formed by rolling with special grooves provided on the upper roll and the lower roll of the rolling mill. In particular, as shown by the broken line in FIG. 6, the protrusion P1 is provided at the center position of the adjacent protrusion P2.

  However, depending on the wear difference between the upper roll and the lower roll, the position of the groove of the upper roll and the position of the groove of the lower roll are different, and the position of the protrusion P1 is a distance S as shown by the solid line in FIG. May differ by minutes. If the position of the protrusion P1 with respect to the protrusion P2 is different, the strength of the steel bar is reduced. Further, in the screw rebar, screw pitch deviation occurs. When the position of the projection P1 with respect to the projection P2 is different, it is desirable to replace at least one of the upper roll and the lower roll with a new roll, but these rolls are expensive. It leads to the cost increase of the reinforcing bar.

  In view of this, a phase adjustment mechanism that adjusts the phase of the output shaft with respect to the phase of the input shaft is provided between the input shaft and the output shaft of the drive shaft of the rolling mill (see, for example, Patent Document 1). . The phase adjusting mechanism can adjust the positions of the protrusions P1 and P2 by adjusting the position of the groove of the upper roll and the position of the groove of the lower roll. Thereby, frequent replacement | exchange of a roll can be suppressed.

Here, with reference to FIG.7 and FIG.8, the phase adjustment mechanism of the drive shaft of the conventional rolling mill is demonstrated.
As shown in FIG. 7, the phase adjustment mechanism 100 changes the position of the input shaft 120 in the axial direction of the drive shaft A relative to the output shaft 110, thereby changing the first helical spline 121 provided on the input shaft 120 and the output shaft. The position of the output shaft 110 is changed with respect to the phase of the input shaft 120 by changing the position of the second helical spline 111 provided in 110 in the axial direction.

  The phase adjustment mechanism 100 is provided with a first clutch 130 and a second clutch 140 that transmit torque between the input shaft 120 and the output shaft 110. The phase adjustment mechanism 100 is provided with an adjustment nut 150 that rotates the first clutch 130 in the circumferential direction. Then, as a fixing means for fixing the first clutch 130 and the adjustment nut 150, the bolt 160 inserted through the first clutch 130 and the adjustment nut 150 and the one end 161 in the axial direction of the bolt 160 are inserted into the bolt 160. A fixed nut 170 is provided to sandwich the first clutch 130 and the adjusting nut 150 in the axial direction together with the head 162 of the head.

The phase adjusting mechanism 100 moves the input shaft 120 in the axial direction by the adjusting nut 150 in a state where the second clutch 140 is variable with respect to the first clutch 130 by loosening the bolt 160. Accordingly, the output shaft 110 rotates due to the meshing of the first helical spline 121 and the second helical spline 111. Therefore, the position of the input shaft 120 in the axial direction with respect to the output shaft 110 is changed without changing the degree of engagement between the first helical spline 121 and the second helical spline 111. As a result, since the position of the first helical spline 121 in the axial direction with respect to the second helical spline 111 is changed, the phase of the output shaft 110 with respect to the phase of the input shaft 120 is changed.
Japanese Utility Model Publication No. 6-47734

  By the way, as shown in FIG. 8, a plurality of fixing nuts 170 are provided apart from the outer peripheral surface 112 of the output shaft 110 in the circumferential direction. The fixing nut 170 is provided in a cylindrical shape, and is arranged with a gap in the radial direction from the outer peripheral surface 112 of the output shaft 110.

  However, in the conventional structure shown in FIGS. 7 and 8, when the bolt 160 is loosened, the outer peripheral surface 171 of the fixing nut 170 does not come into contact with other members. May end up. As a result, the bolt 160 cannot be loosened with respect to the fixing nut 170, and it is difficult to adjust the phase of the output shaft 110 with respect to the phase of the input shaft 120.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a phase adjustment mechanism capable of easily adjusting the phase of the output shaft with respect to the phase of the input shaft. It is.

  The invention according to claim 1 includes a drive shaft having a first helical spline provided on the input shaft and a second helical spline provided on the output shaft and meshing with the first helical spline. A first clutch fixed to the output shaft in a phase adjusting mechanism of the drive shaft that adjusts the phase of the output shaft relative to the phase of the input shaft by changing the position of the second helical spline in the axial direction with respect to the helical spline. A second clutch that meshes with the first clutch, an adjustment portion that rotates the first clutch in a circumferential direction with respect to the input shaft, a bolt that passes through the adjustment portion and the first clutch, and a bolt An insertion member that is inserted and sandwiches the adjusting portion and the first clutch with the bolt. Co-rotation prevention means for preventing co-rotation of the bets and summarized in that is provided.

  According to this invention, when the phase adjustment is performed by the phase adjustment mechanism, the insertion member can be prevented from rotating together with the bolt when the bolt is loosened by providing the rotation prevention means on the insertion member. Therefore, the bolt can be easily loosened with respect to the insertion member. Therefore, the phase adjustment work can be easily performed.

  According to a second aspect of the present invention, in the drive shaft phase adjusting mechanism according to the first aspect, the insertion member is formed in an annular shape surrounding the output shaft as the co-rotation preventing means, and the insertion The gist is that the inner peripheral surface of the member is configured to be close to the outer peripheral surface of the output shaft.

  According to this invention, since the insertion member is formed in an annular shape surrounding the output shaft, the insertion member can be prevented from rotating around the rotation center of the bolt. In particular, since the inner peripheral surface of the insertion member is close to the outer peripheral surface of the output shaft, rotation of the insertion member is prevented by contacting the outer peripheral surface of the output shaft even if the insertion member tries to rotate around the rotation center of the bolt. Is done.

  According to a third aspect of the present invention, in the drive shaft phase adjusting mechanism according to the first aspect, the insertion member is formed in an arc shape, and an inner peripheral surface of the insertion member is an outer peripheral surface of the output shaft. The gist is that the inner circumferential surface of the insertion member has a shape along the outer circumferential surface of the output shaft as the co-rotation preventing means.

  According to this invention, the inner peripheral surface of the insertion member is shaped along the outer peripheral surface of the output shaft, so that even if the insertion member tries to rotate around the rotation center of the bolt, it comes into contact with the outer peripheral surface of the output shaft. Thus, the rotation of the bolt and the insertion member can be prevented. Further, since the insertion member is formed in an arc shape, the insertion member can be easily attached to the rolling mill as compared with the case where the insertion member is annular.

  According to a fourth aspect of the present invention, in the phase adjusting mechanism for the drive shaft according to the first aspect, the insertion member is formed in a substantially cylindrical shape concentric with the bolt, and the outer peripheral surface of the insertion member is The gist is that a flat portion is provided in a portion of the outer peripheral surface of the insertion member that is disposed in the vicinity of the outer peripheral surface of the output shaft and is close to the outer peripheral surface of the output shaft, as the co-rotation preventing means. To do.

  According to the present invention, since the flat portion is formed on the outer peripheral surface of the insertion member, the outer peripheral surface of the output shaft comes into contact with the flat portion even when the insertion member tries to rotate around the rotation center of the bolt. Since it becomes a stop | fastening, the joint rotation of a volt | bolt and an insertion member can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the phase adjustment mechanism which can perform the operation | work of the adjustment of the phase of an output shaft with respect to the phase of an input shaft easily can be provided.

(First embodiment)
A first embodiment in which the phase adjusting mechanism of the present invention is embodied as a phase adjusting mechanism used for a drive shaft of a rolling mill will be described with reference to FIGS.

First, with reference to FIG. 1, the structure of the drive shaft 1 of a rolling mill is demonstrated.
As shown in FIG. 1, the drive shaft 1 is disposed between the reduction gear and the roll of the rolling mill, and transmits the rotation of the reduction gear and the rotation of the input shaft 10 and the rotation of the roll. And the phase adjusting mechanism 30 provided between the input shaft 10 and the output shaft 20.

  Hereinafter, the direction in which the input shaft 10 and the output shaft 20 extend is referred to as “axial direction”, and the radial direction perpendicular to the axial direction of the input shaft 10 and output shaft is referred to as “radial direction”. The circumferential direction is called “circumferential direction”. In the axial direction, the input shaft side is referred to as “input side”, and the output shaft side is referred to as “output side”.

  The input shaft 10 includes a cylindrical cover body 11 having a through hole penetrating in the axial direction, a shaft body 12 inserted into the through hole of the cover body 11, and a radial direction between the cover body 11 and the shaft body 12. And a cylindrical sleeve 13 that fits with the shaft body 12. In the input shaft 10, the shaft body 12 is rotated by the speed reducer. As the shaft body 12 rotates, the sleeve 13 fitted to the shaft body 12 also rotates.

  Here, the first spline 12a is provided on the outer peripheral surface of the shaft body 12, that is, the outer surface in the radial direction of the shaft body 12, and the inner peripheral surface of the sleeve 13, that is, the inner surface in the radial direction of the sleeve 13. A second spline 13a is provided on the surface. The sleeve 13 is fitted to the shaft body 12 by the first spline 12a and the second spline 13a meshing with each other.

  The sleeve 13 is constituted by four divided bodies of a first sleeve 13b to a fourth sleeve 13e in order from the input side in the axial direction. Each of the first sleeve 13b to the fourth sleeve 13e is provided with a second spline 13a. A first helical spline 14 is provided on the outer peripheral surface of the fourth sleeve 13e, that is, the outer surface in the radial direction of the fourth sleeve 13e. Further, in the fourth sleeve 13e, a screw portion 15 is provided on the outer peripheral surface on the input side in the axial direction from the first helical spline.

  The output shaft 20 is provided with a hollow cylindrical portion 21 into which the first helical spline 14 of the fourth sleeve 13e is inserted. A second helical spline 22 that meshes with the first helical spline 14 is provided on the inner peripheral surface of the cylindrical portion 21, that is, the radially inner surface of the cylindrical portion 21.

Next, a detailed configuration of the phase adjustment mechanism 30 will be described with reference to FIG.
The phase adjustment mechanism 30 moves the input shaft 10 in the axial direction with respect to the output shaft 20, thereby changing the position of the second helical spline 22 in the axial direction with respect to the first helical spline 14 to change the phase of the input shaft 10. The phase of the output shaft 20 with respect to is changed. As shown in FIG. 2, the phase adjustment mechanism 30 is provided with a first clutch 31 and a second clutch 32 that transmit the torque of the input shaft 10 to the output shaft 20 by meshing with each other.

  The phase adjustment mechanism 30 surrounds the input shaft 10 with the first cover portion 33, the adjustment nut 34, the second cover portion 35, and the first clutch 31. Thereby, an outer frame of the phase adjustment mechanism 30 is formed. Hereinafter, each configuration of the phase adjustment mechanism 30 will be described.

  The first cover portion 33 is provided with a base portion 33a facing the adjustment nut 34 in the axial direction and a cylindrical portion 33b extending from the radial inner edge of the base portion 33a to the input side in the axial direction. The cylindrical portion 33 b is provided with a seal portion 33 c that suppresses intrusion of dust from the outside of the drive shaft 1 by contacting the outer peripheral surface of the input shaft 10. Further, the seal portion 33c also prevents the grease applied to the screw portion 15, the first helical spline 14, and the second helical spline 22 from scattering from the drive shaft 1 to the outside.

  The adjustment nut 34 is positioned on the output side in the axial direction with respect to the first cover portion 33, and is in the same position in the axial direction as the screw portion 15 of the input shaft 10. The adjustment nut 34 is formed in an annular shape that surrounds the input shaft 10. The adjustment nut 34 includes an outer peripheral portion 34a that is in axial contact with the radial outer edge portion 33d of the first cover portion 33, and an inner peripheral portion 34b that extends radially inward from the outer edge portion 33d. Is provided. A screw portion 34c that meshes with the screw portion 15 is provided on the inner peripheral surface of the inner peripheral portion 34b, that is, the inner surface in the radial direction of the inner peripheral portion 34b.

  The second cover portion 35 is positioned on the output side in the axial direction from the adjustment nut 34 and is in contact with the outer peripheral portion 34 a of the adjustment nut 34 in the axial direction. The second cover portion 35 is formed in a cylindrical shape that surrounds the second clutch 32.

  The first clutch 31 is positioned on the output side in the axial direction with respect to the second cover portion 35 and is in contact with the second cover portion 35 in the axial direction. The first clutch 31 is close to the outer peripheral surface 23 of the cylindrical portion 21 of the output shaft 20 in the radial direction.

  Further, the second clutch 32 is disposed on the input side in the axial direction from the first clutch 31 and is fixed to the cylindrical portion 21 of the output shaft 20. A bearing portion 37 is disposed between the inner peripheral portion 34 b of the adjustment nut 34 and the second clutch 32 in the axial direction. With this bearing portion 37, the second clutch 32 can rotate relative to the adjustment nut 34. Further, the first clutch 31 and the second clutch 32 are provided with tooth portions 31a and 32a for transmitting the torque of the input shaft 10 to the output shaft 20 by engaging with each other.

  Further, the first cover portion 33, the adjustment nut 34, the second cover portion 35, and the first clutch 31 are provided with through holes 33e, 34e, 35e, 31e penetrating in the axial direction, respectively. Bolts 36 are inserted into the through holes 33e, 34e, 35e, 31e. A first nut 38 fixed to the bolt 36 and a second nut 39 disposed on the output side in the axial direction from the first nut 38 are attached to the output side of the bolt 36 in the axial direction. The first nut 38 is disposed on the output side in the axial direction from the first clutch 31 and is in contact with the first clutch 31. As a result, the bolt 36 and the first nut 38 sandwich the first cover portion 33, the adjustment nut 34, the second cover portion 35, and the first clutch 31 from the axial direction. The second nut 39 is disposed at a certain distance from the first nut 38 in the axial direction. The second nut 39 serves to prevent the first nut 38 from moving from the axial output side and coming off the bolt 36.

Next, a method of adjusting the phase of the output shaft 20 with respect to the phase of the input shaft 10 by the phase adjusting mechanism 30 (hereinafter simply referred to as “phase adjustment by the phase adjusting mechanism 30”) will be described.
First, the bolt 36 is loosened so that the adjustment nut 34 is movable in the circumferential direction. Then, by rotating the adjustment nut 34 in the circumferential direction, the input shaft 10 having the screw portion 15 screwed with the screw portion 34 c of the adjustment nut 34 moves in the axial direction with respect to the adjustment nut 34. Here, the input shaft 10 is set so that it can move in the axial direction but cannot move in the circumferential direction. The output shaft 20 is set so that it can move in the circumferential direction but cannot move in the axial direction.

  Further, by loosening the bolt 36, the first nut 38 can be displaced in the axial direction. As the first nut 38 is displaceable in the axial direction, the first clutch 31 is similarly displaceable in the axial direction.

  Here, when the adjustment nut 34 is rotated in the circumferential direction, the first clutch 31 rotates in the same direction as the rotation of the adjustment nut 34 in the circumferential direction. On the other hand, with the movement of the input shaft 10 in the axial direction, the output shaft 20 is rotated so as to rotate the second helical spline 22 in the circumferential direction in order to maintain the engagement between the first helical spline 14 and the second helical spline 22. Rotates in the circumferential direction. The second clutch 32 fixed to the output shaft 20 also rotates in the circumferential direction. Further, since the rotation amount of the first clutch 31 is larger than the rotation amount of the second clutch 32, even if the first clutch 31 and the second clutch 32 rotate in the same direction, the second clutch 32 has a second rotation amount. The one clutch 31 rotates in the circumferential direction relatively. Therefore, the degree of engagement between the first clutch 31 and the second clutch 32 is adjusted, that is, the tooth portion 31 a of the first clutch 31 rides on the tooth portion 32 a of the second clutch 32, thereby The position of the first clutch 31 in the axial direction is changed.

  Thus, the position of the input shaft 10 in the axial direction is changed with respect to the output shaft 20, that is, the axial direction of the first helical spline 14 of the input shaft 10 with respect to the second helical spline 22 of the output shaft 20. Since the position is changed, the phase of the output shaft 20 is changed with respect to the phase of the input shaft 10.

  Finally, by tightening the loosened bolt 36, the first cover portion 33, the adjusting nut 34, the second cover portion 35, and the second clutch 32 are fixed in the axial direction by the bolt 36 and the first nut 38. . As a result, the first clutch 31 and the second clutch 32 are engaged again. With the above method, the phase adjustment by the phase adjustment mechanism 30 is completed.

Next, the structure of the first nut 38 will be described with reference to FIG. In FIG. 3A, the detailed structure of the output shaft 20 is omitted.
As shown in FIG. 3A, the first nut 38 is a single member and is formed in an annular shape that radially surrounds the outer peripheral surface 23 of the output shaft 20. The inner peripheral surface 38a of the first nut 38 is close to the outer peripheral surface 23 of the output shaft 20 in the radial direction. The first nut 38 is provided with a plurality of through holes 38b (see FIG. 3B) for inserting the bolts 36. These through holes 38b are spaced apart from each other in the circumferential direction. In the present embodiment, three through holes 38b are provided at an equal distribution of 120 degrees in the circumferential direction.

  As shown in FIG. 3B, the through hole 38b includes a fixing hole 38c having a female screw screwed to the bolt 36, and an insertion hole 38d having an inner diameter R2 larger than the inner diameter R1 of the fixing hole 38c. ing. The insertion hole 38d is provided on the input side in the axial direction from the fixed hole 38c. In addition, the coil spring 38e is disposed in a compressed state in the insertion hole 38d. The coil spring 38e biases the first clutch 31 (see FIG. 2) toward the input side in the axial direction.

  Further, as shown in FIG. 3A, the first nut 38 is provided in an annular single member, and the outer peripheral surface 23 of the output shaft 20 and the inner peripheral surface 38a of the first nut 38 are in the radial direction. Since they are close to each other, the first nut 38 is prevented from rotating together around the rotation center C <b> 1 of the bolt 36 due to the moment accompanying the rotation of the bolt 36 when loosening each bolt 36 screwed to the first nut 38. .

According to the phase adjustment mechanism 30 of the present embodiment, the following effects can be achieved.
(1) In the present embodiment, the first nut 38 is formed in an annular shape surrounding the outer peripheral surface 23 of the output shaft 20, and the inner peripheral surface 38 a of the first nut 38 is connected to the outer peripheral surface 23 of the output shaft 20. It is a close configuration. With this configuration, the first nut 38 forms a co-rotation preventing means for preventing co-rotation with the bolt 36. Therefore, when adjusting the phase of the output shaft 20 with respect to the phase of the input shaft 10 by the phase adjustment mechanism 30, the first nut 38 rotates together when the bolt 36 is rotated in the loosening direction, so that the bolt 36 becomes the first. The problem that the nut 38 cannot be loosened can be prevented. As a result, since the bolt 36 can be easily removed from the first nut 38, the phase adjustment mechanism 30 can easily adjust the phase of the output shaft 20 with respect to the phase of the input shaft 10.

  In particular, when the drive shaft 1 is disposed along the vertical direction, specifically, when the input shaft 10 is disposed above the vertical direction and the output shaft 20 is disposed below the vertical direction, The phase adjustment mechanism 30 is arranged several meters (for example, 4 to 5 meters) above the installation surface. In the rolling mill, since the two rolls are arranged close to each other, the phase adjusting mechanism 30 provided on the drive shaft of each roll is also arranged close to each other. Therefore, since the phase adjustment mechanism 30 is provided at a high place, the operator's scaffolding is limited, and the work space for performing the phase adjustment with the phase adjustment mechanism 30 being close to each other is small, so the first nut 38 does not rotate together. In this way, it is difficult to loosen the bolt 36. In this respect, in the present embodiment, since the first nut 38 does not rotate with the bolt 36, it is not necessary to hold the first nut 38 when the bolt 36 is loosened. Therefore, the worker's scaffold is limited, and the worker can perform the phase adjustment even when there is no work space for the phase adjustment.

  (2) In the present embodiment, since the first nut 38 is composed of a single member, the number of parts is reduced compared to the fixed nut 170 corresponding to the first nut having the conventional structure shown in FIG. can do.

(Second Embodiment)
A second embodiment in which the phase adjustment mechanism of the present invention is embodied as a phase adjustment mechanism used for a drive shaft of a rolling mill will be described with reference to FIG. In addition, in this embodiment, since only the shape of a 1st nut differs compared with 1st Embodiment, the same code | symbol is attached | subjected to the same component and the description is abbreviate | omitted. In FIG. 4, the detailed structure of the output shaft 20 is omitted.

  As shown in FIG. 4, the 1st nut 40 is comprised from the three division bodies 41 formed in circular arc shape. Each divided body 41 is provided with a through-hole to which the bolt 36 is fixed at the center position of the arc. The inner peripheral surface 42 of each divided body 41 is formed in a shape along the outer peripheral surface 23 of the output shaft 20 while being close to the outer peripheral surface 23 of the output shaft 20. With the above-described configuration, each divided body 41 forms a common rotation preventing means for preventing the bolt 36 from rotating together. Moreover, the division bodies 41 are each formed in the same shape.

According to the phase adjustment mechanism of this embodiment, in addition to the effect (1) of the first embodiment, the following effects can be achieved.
(3) In this embodiment, since each division body 41 is formed in the same shape, it becomes possible to make the kind of shape of the division body 41 into one type, and to reduce the manufacturing cost of the division body 41. Can do. In addition, in the assembly process of the phase adjustment mechanism 30, the divided bodies 41 can be attached to the bolts 36 without being distinguished from each other, so that the phase adjustment mechanism 30 can be easily assembled.

(Third embodiment)
With reference to FIG. 5, a third embodiment in which the phase adjusting mechanism of the present invention is embodied as a phase adjusting mechanism used for a drive shaft of a rolling mill will be described. In addition, in this embodiment, since only the shape of a 1st nut differs compared with 1st Embodiment, the same code | symbol is attached | subjected to the same component and the description is abbreviate | omitted. In FIG. 5, the detailed structure of the output shaft 20 is omitted.

  As shown in FIG. 5, the first nut 50 is attached to each bolt 36 and is formed in a substantially cylindrical shape concentric with the bolt 36. The outer peripheral surface 51 of the first nut 50 is provided with two flat portions 52. Of the two flat portions 52, one flat portion 52 is close to the outer peripheral surface 23 of the output shaft 20 in the radial direction. With the above configuration, the first nut 50 forms a co-rotation preventing means for preventing co-rotation with the bolt 36. Moreover, the 1st nut 50 is each formed in the same shape.

According to the phase adjustment mechanism of this embodiment, in addition to the effect (1) of the first embodiment, the following effects can be achieved.
(4) In the present embodiment, since the first nut 50 is formed in a substantially cylindrical shape concentric with the bolt 36, it is compared with the first nut 38 of the first embodiment and the first nut 40 of the second embodiment. Thus, the size of the first nut 50 itself can be reduced. Therefore, the material cost of the first nut 50 can be reduced. Moreover, since each of the first nuts 50 is formed in the same shape, the first nut 50 can be formed in one type, and the manufacturing cost of the first nut 50 can be reduced. In addition, in the assembly process of the phase adjustment mechanism 30, the first nuts 50 can be attached to the bolts 36 without being distinguished from each other, so that the phase adjustment mechanism 30 can be easily assembled.

  Further, in the rolling mill, since the upper roll and the lower roll are arranged close to each other, the phase adjusting mechanism 30 provided in each roll is also arranged close to the same. In addition, since the phase adjustment mechanism 30 is larger in the radial direction than other portions of the drive shaft 1, it is desired to reduce the size of the phase adjustment mechanism 30 in the radial direction. In this regard, in the present embodiment, the phase adjustment mechanism 30 is reduced in size in the radial direction by providing the plane portion 52 that is not close to the outer peripheral surface 23 of the output shaft 20 in the radial direction. Can be

(Other embodiments)
The present invention is not limited to the above embodiment, and can be modified as follows.

  -In 3rd Embodiment, although the two plane parts 52 were provided in the outer peripheral surface 51 of the 1st nut 50, the number of the plane parts 52 is not limited to this. Since the outer peripheral surface 23 of the output shaft 20 and the plane part 52 may be configured to be close to each other, the number of the plane parts 52 may be one or three or more.

  -In 2nd Embodiment, although one through-hole for fixing one volt | bolt 36 was provided in each division body 41 which comprises the 1st nut 40, the number of through-holes is limited to this There is nothing. For example, the divided body 41 may be provided with two or more through holes.

  -In 2nd Embodiment, although the 1st nut 40 was comprised by the three division bodies 41, the number of the division bodies 41 is not limited to this. For example, the number of divided bodies 41 may be two, or four or more. Here, when the number of the divided bodies 41 is two, the width of the arc-shaped divided body 41 is desirably 180 degrees or less. With this configuration, the work of attaching the divided body 41 to the outer peripheral surface 23 of the output shaft 20 can be easily performed.

  In the first embodiment, the first nut 38 is formed in an annular shape, but the shape of the first nut 38 is not limited to this. Since the 1st nut 38 should just be the annular | circular shape which surrounds the outer peripheral surface 23 of the output shaft 20, polygonal shape may be sufficient as it.

  In the first to third embodiments, the first nuts 38, 40, and 50 are directly fixed to the bolts 36, but the present invention is not limited to this. The first nuts 38, 40, and 50 only have to play a role of restricting the movement of the first clutch 31 to the axial output side, respectively. A structure may be used in which the first nuts 38, 40, and 50 are supported from the output side in the axial direction using only another nut.

FIG. 3 is a half sectional view showing a half sectional structure of a drive shaft provided with the position adjusting mechanism in the first embodiment that embodies the position adjusting mechanism of the present invention. The half sectional view showing the half section structure of the position adjustment mechanism about the position adjustment mechanism of the embodiment. (A) About the position adjustment mechanism of the embodiment, the top view which shows the arrangement | positioning relationship between the planar structure which looked at the 1st nut of the position adjustment mechanism from the axial direction, and an output shaft. (B) Sectional drawing which shows the cross-section which cut | disconnected the 1st nut in the cross section AA about the position adjustment mechanism of the embodiment. The top view which shows the arrangement | positioning relationship between the planar structure which looked at the 1st nut of the position adjustment mechanism from the axial direction, and the output shaft about 2nd Embodiment which actualized the position adjustment mechanism of this invention. The top view which shows the arrangement | positioning relationship between the planar structure which looked at the 1st nut of the position adjustment mechanism from the axial direction, and the output shaft about 3rd Embodiment which actualized the position adjustment mechanism of this invention. The front view which shows the front structure of the deformed reinforcing bar formed with the rolling mill. The half sectional view which shows the half sectional structure of the position adjustment mechanism about the position adjustment mechanism of the conventional structure. The top view which shows the arrangement | positioning relationship between the planar structure of the volt | bolt and nut of a position adjustment mechanism, and an output shaft about the position adjustment mechanism of the conventional structure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive shaft, 10 ... Input shaft, 11 ... Cover body, 12 ... Shaft body, 12a ... 1st spline, 13 ... Sleeve, 13a ... 2nd spline, 13b ... 1st sleeve, 13c ... 2nd sleeve, 13d ... 3rd sleeve, 13e ... 4th sleeve, 14 ... 1st helical spline, 15 ... Screw part, 20 ... Output shaft, 21 ... Cylindrical part, 22 ... 2nd helical spline, 23 ... Outer peripheral surface, 30 ... Phase adjustment mechanism, 31 ... first clutch, 31a ... tooth portion, 31e ... through hole, 32 ... second clutch, 32a ... tooth portion, 33 ... first cover portion, 33a ... base portion, 33b ... cylindrical portion, 33c ... sealing portion, 33d ... Outer edge part, 33e ... through hole, 34 ... adjustment nut (adjustment part), 34a ... outer peripheral part, 34b ... inner peripheral part, 34c ... gear part, 34e ... through hole, 35 ... second cover body, 35e ... through hole, 36 ... Bolt 37 ... bearing portion, 38 ... first nut (insertion member), 39 ... second nut, 40 ... first nut (insertion member), 41 ... divided body, 42 ... inner peripheral surface, 50 ... first nut (insertion member) ), 51... Outer peripheral surface, 52.

Claims (4)

A drive shaft having a first helical spline provided on the input shaft and a second helical spline provided on the output shaft and meshing with the first helical spline, the shaft of the second helical spline with respect to the first helical spline In the phase adjustment mechanism of the drive shaft that adjusts the phase of the output shaft with respect to the phase of the input shaft by changing the position in the direction,
A first clutch fixed to the output shaft; a second clutch that meshes with the first clutch; an adjustment portion that rotates the first clutch in a circumferential direction with respect to the input shaft; the adjustment portion; A bolt for inserting a clutch; and an insertion member inserted into the bolt and sandwiching the adjusting portion and the first clutch with the bolt,
The insertion member is provided with a co-rotation preventing means for preventing co-rotation with the bolt. In the phase adjustment mechanism of the drive shaft according to claim 1,
As the co-rotation preventing means, the insertion member is formed in an annular shape surrounding the output shaft, and the inner peripheral surface of the insertion member is configured to be close to the outer peripheral surface of the output shaft. Drive shaft phase adjustment mechanism. In the phase adjustment mechanism of the drive shaft according to claim 1,
The insertion member is formed in an arc shape, and an inner peripheral surface of the insertion member is disposed in proximity to an outer peripheral surface of the output shaft,
As the co-rotation preventing means, the inner peripheral surface of the insertion member has a shape along the outer peripheral surface of the output shaft. In the phase adjustment mechanism of the drive shaft according to claim 1,
The insertion member is formed in a substantially cylindrical shape concentric with the bolt, and the outer peripheral surface of the insertion member is disposed close to the outer peripheral surface of the output shaft,
As the co-rotation preventing means, a planar portion is provided in a portion of the outer peripheral surface of the insertion member that is close to the outer peripheral surface of the output shaft.

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