JP6260328B2 - Drive shaft with phase adjustment function - Google Patents

Description

  The present invention relates to a drive shaft with a phase adjustment function that can adjust the phase between an end portion on one side in the axial direction and an end portion on the other side.

  Examples of steel bars with added value include deformed bars and threaded bars. The deformed reinforcing bar is provided with a projection like a node, and the threaded reinforcing bar is provided with a projection serving as a thread. The deformed reinforcing bar and the threaded reinforcing bar are formed by rolling with an upper roll and a lower roll, and the protrusion is also formed by grooves provided in the upper roll and the lower roll simultaneously with the rolling of the main body of the reinforcing bar.

However, a difference in wear between the upper roll and the lower roll may occur, and the circumferential position of the groove may differ between the two rolls. In this case, the position of the protrusion formed by the upper roll and the lower roll There may be a problem that the position of the protrusion to be displaced is shifted. Thus, if the position of a protrusion shifts with the same reinforcing bar, the strength decreases in the case of a deformed reinforcing bar, and the screw pitch shifts in the case of a screw reinforcing bar.
In order to solve this problem, at least one of the upper roll and the lower roll may be replaced with a new roll. However, since the roll is expensive, if it is frequently replaced, the cost of the reinforcing bar is increased.

  Therefore, a drive shaft with a phase adjustment function that can adjust the phase of the input flange on one side in the axial direction and the output flange on the other side in the axial direction is used as a drive shaft (drive shaft that rotates the roller) provided in the rolling mill. Used (see, for example, Patent Document 1).

As shown in FIG. 6, the drive shaft with a phase adjustment function includes an input shaft 91, an output shaft 92, and a phase adjustment mechanism 93 interposed between the shafts 91 and 92. The input shaft 91 includes an input shaft body 91b having an input flange 91a at an end portion and an input cylinder body 91c. The input shaft body 91b and the input cylinder body 91c are spline-coupled. The input cylinder body 91c is not rotatable with respect to the input shaft body 91b, but is movable in the axial direction. The end portion of the input cylinder 91 c is integrated with the phase adjustment mechanism 93.
The output shaft 92 has an output flange 92 a at one end, and the other end is integrated with the phase adjustment mechanism 93. The phase adjustment mechanism 93 has a function of adjusting the phase (position in the rotational direction) between the input flange 91a and the output flange 92a.

  As shown in FIG. 7, the phase adjustment mechanism 93 includes an axial first connection body 94, a cylindrical second connection body 95, bushes 96 and 97, an adjustment nut 98, and a clutch portion 99. A first helical spline 94 a and a male screw portion 94 b are formed on the outer peripheral surface of the first connection body 94. A second helical spline 95 a that meshes with the first helical spline 94 a is formed on the inner peripheral surface of the second connection body 95. The phase adjusting function-equipped drive shaft 90 (see FIG. 6) is connected to a joint (not shown) on both sides in the axial direction, and a first connection body 94 connected to the input cylinder 91c of the input shaft 91. Can move in the axial direction together with the input cylinder 91c with respect to the input shaft 91b, but cannot rotate together with the input cylinder 91c. The second connecting body 95 cannot move in the axial direction, but can rotate with the output shaft 92.

In FIG. 7, the adjustment nut 98 has a female screw portion 98b that meshes with the male screw portion 94b. A rotation member 98a is attached to the adjustment nut 98 via a first clutch member 99a of the clutch portion 99. By rotating the rotation member 98a, the first clutch member 99a and the adjustment nut 98 are rotated. Can be rotated.
The operator can rotate the adjusting nut 98 by inserting a jig (not shown) into the hole 98c formed in the rotating member 98a and rotating the rotating member 98a. The rotation of the adjustment nut 98 can displace the first connection body 94 that is not allowed to rotate in the axial direction with respect to the second connection body 95. By displacing the first connecting body 94 in the axial direction, the second connecting body 95 can be rotated together with the output shaft 92 by the action of the helical splines 94a and 95a, thereby the input flange 91a (see FIG. 6). And the phase of the output flange 92a can be adjusted (changed).

When the adjustment nut 98 is rotated for this phase adjustment, the second bolt member 99b of the clutch portion 99 is pivoted relative to the first clutch member 99a by loosening the operation bolt 99c. The second clutch member 99b and the first clutch member 99a can be rotated relative to each other. The second clutch member 99b is attached to the second connection body 95 via a sleeve 99d, and is a member that can rotate integrally with the second connection body 95.
On the other hand, when the torque is transmitted by the drive shaft 90 with a phase adjustment function for the rolling operation by the rolling mill after the phase adjustment, the second clutch member 99b is tightened by tightening the operation bolt 99c. The first clutch member 99a cannot be separated in the axial direction. Thereby, the first clutch member 99a and the second clutch member 99b are switched to a state where relative rotation is impossible. Thus, torque transmission between the first connection body 94 and the second connection body 95 is performed by the clutch portion 99 and the helical splines 94a and 95a, and torque transmission by the drive shaft 90 becomes possible.

JP 2010-127436 A

  Generally, in the helical splines (94a, 95a), a gap (diameter gap) formed between them is relatively large. For this reason, in the phase adjustment mechanism 93 shown in FIG. 7, the first connection body 94 in which the first helical spline 94a is formed and the second connection body 95 in which the second helical spline 95a is formed are concentric. The bushes 96 and 97 are provided for support. The bushes 96 and 97 are provided between the outer peripheral surface of the first connection body 94 and the inner peripheral surface of the second connection body 95.

One bush 96 is attached at a position adjacent to the second helical spline 95a in the axial direction of the second connection body 95, and is fitted into a part of the first helical spline 94a. The body 94 can be supported. The other bush 97 is attached to the axial end portion of the second connection body 95, and can support the first connection body 94 by being externally fitted to the axial end portion 94 c of the first connection body 94. .
That is, as described above, the helical splines 94a and 95a have a relatively large gap (gap in the radial direction) formed between them, so that the first connection body 94 and the second connection body 95 are (in the radial direction). ) Easy to shift. Therefore, by arranging the bushes 96 and 97 to support the helical splines 94a and 95a from both sides in the axial direction, the positions of the first connecting body 94 and the second connecting body 95 in the radial direction are arranged. Prevents deviation.

However, as shown in FIG. 7, when the pair of bushes 96 and 97 are arranged side by side with the helical splines 94a and 95a in the axial direction, the axial dimension of the phase adjusting mechanism 93 becomes long. When the axial dimension of the phase adjustment mechanism 93 is long, for example, when it is necessary to install the phase adjustment mechanism 93 within an axial range limited in the drive shaft 90, the installation becomes difficult.
Therefore, an object of the present invention is to provide a drive shaft with a phase adjustment function that makes it possible to make the phase adjustment mechanism compact in the axial direction.

  The drive shaft with a phase adjustment function of the present invention includes a phase adjustment mechanism that can adjust the phase between one end portion in the axial direction and the other end portion in the axial direction. A first connection body in which one helical spline and a male screw portion are formed, and a second helical spline that is provided on the radially outer side of a part of the first connection body and meshes with the first helical spline are formed on the inner peripheral surface. The second connection body, a bush for supporting the first connection body and the second connection body concentrically, and an internal thread portion that meshes with the external thread portion and rotating the first connection body as a shaft An adjustment nut that is displaced in a direction, and a clutch portion that switches between a state that allows rotation of the adjustment nut relative to the second connection body and a state that disables the rotation, and the first connection body includes a cylinder portion. Have The connecting body has a cylindrical main body portion located radially outside the tube portion and a shaft portion located radially inside the tube portion, and the bush includes an inner peripheral surface of the tube portion and the shaft portion. It is provided between the outer peripheral surfaces.

  According to the present invention, the second connection body has a cylindrical main body portion located on the radially outer side of the tubular portion of the first connection body and a shaft portion located on the radially inner side of the tubular portion. Since the bush is provided between the inner peripheral surface of the cylindrical portion of the first connecting body and the outer peripheral surface of the shaft portion of the second connecting body, the bush is arranged in a radial direction with the helical spline. can do. That is, it is not necessary to arrange the bushes side by side with the helical spline, and the phase adjustment mechanism can be made compact in the axial direction.

Moreover, it is preferable that the said bush is provided in the range of the radial inside of the formation area of a said 1st helical spline.
In this case, the bush can prevent the first connecting body and the second connecting body from being displaced in the radial direction on the radially inner side of the helical spline.

The clutch portion can rotate integrally with the first clutch member that rotates integrally with the adjustment nut, the second clutch member that rotates together with the second connector, and the first clutch member and the second clutch member. A switching device for switching between the state connected to the state and the state released from the connection, and at least one of the first clutch member and the second clutch part is disposed radially outside the adjustment nut. It is preferable.
In this case, at least a part of the clutch portion can be arranged side by side with the adjustment nut in the radial direction. That is, it is not necessary to arrange the clutch portion side by side with the adjustment nut in the axial direction, and it is possible to contribute to the axial adjustment of the phase adjustment mechanism.

In addition, it is preferable that the phase adjustment mechanism further includes a stopper portion that limits a displacement width in an axial direction of the first connection body with respect to the second connection body.
In this case, if the operator turns the adjustment nut too much for phase adjustment, even if the first connecting body tends to be displaced more than necessary, the stopper portion can prevent this unnecessary displacement.

  According to the drive shaft with phase adjustment function of the present invention, the phase adjustment mechanism can be made compact in the axial direction.

It is a side view which shows one Embodiment of the drive shaft with a phase adjustment function of this invention. It is a side view of a phase adjustment mechanism and its periphery. It is sectional drawing of a phase adjustment mechanism. It is explanatory drawing explaining the joint surface of a 1st clutch member, and the joint surface of a 2nd clutch member. It is explanatory drawing of a clutch part. It is a side view which shows the drive shaft with the conventional phase adjustment function. It is the conventional phase adjustment mechanism and its side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an embodiment of a drive shaft with a phase adjusting function of the present invention. In FIG. 1, the upper half is shown in section. This drive shaft 3 with phase adjustment function is provided via a coupling between a reduction gear and a roll of a rolling mill (not shown), and a drive shaft main body 6 to which rotation of the reduction gear is input, And a phase adjusting mechanism 7 to which the rotational force of the drive shaft body 6 is transmitted. In this embodiment, in order to maintain or replace the phase adjustment mechanism 7 independently, the drive shaft main body 6 and the phase adjustment mechanism 7 are connected by bolts and nuts 9, and the phase adjustment mechanism 7 is connected to the drive shaft main body. 6 is removable.

  The drive shaft body 6 has an input flange 4 connected to the coupling on the reduction gear side, and a phase adjustment mechanism 7 has an output flange 5 connected to the coupling on the roll side. Yes. That is, the drive shaft main body 6 functions as an input shaft to which the rotation of the speed reducer is input, and the phase adjustment mechanism 7 (part thereof) functions as an output shaft that rotates the roll.

The drive shaft main body 6 has an input shaft body 10 having an input flange 4 at an end portion and a cylindrical input cylinder body 11. The input shaft body 10 and the input cylinder body 11 are spline-coupled, and both can rotate together. In addition, due to the spline coupling, the input cylinder 11 is not rotatable with respect to the input shaft body 10, but is movable in the axial direction. A connecting block 12 is fixed to an end of the input cylinder 11, and a first flange 15 included in the phase adjusting mechanism 7 is connected to an intermediate flange 13 included in the connecting block 12 by a bolt and nut 9.
The phase adjusting mechanism 7 can adjust the phase (position in the circumferential direction) between the input flange 4 at the end on the one side in the axial direction and the output flange 5 at the end on the other side in the axial direction. It has a function. In the following, “rotation” of each part means rotation around the axis (center line) C of the drive shaft 3 unless otherwise specified.

FIG. 2 is a side view of the phase adjustment mechanism 7 and its surroundings. In FIG. 2, the upper half is shown in section. The phase adjustment mechanism 7 includes a first connection body 21, a second connection body 22, a bush 23, an adjustment nut 24, and a clutch portion 25.
The 1st connection body 21 is a shaft-shaped member, The 1st helical spline 31 and the external thread part 33 are formed in the outer peripheral surface 21a. The first flange 15 is provided at the end of the first connection body 21.
The second connection body 22 has a cylindrical main body portion 39 and is a cylindrical member as a whole. The second connection body 22 has a shaft portion 37 positioned on the radially inner side of the main body portion 39, and the main body portion 39 and the shaft. An annular portion 40 for connecting the portion 37 is provided. The main body 39 that is a part of the second connection body 22 is provided on the radially outer side of a part of the first connection body 21 (small diameter cylindrical part 36b). And the 2nd helical spline 32 which meshes with the 1st helical spline 31 is formed in the internal peripheral surface 22a of the main-body part 39 which the 2nd connection body 22 has.

  In FIG. 1, the first connecting body 21 is connected to the input cylinder 11 via a connecting block 12, and the first connecting body 21 is connected to the input shaft 10 that is splined with the input cylinder 11. The one connecting body 21 can move in the axial direction together with the input cylinder 11 and the connecting block 12, but cannot rotate together with the input cylinder 11 and the connecting block 12. The second connecting body 22 is not movable in the axial direction but is rotatable.

  FIG. 3 is a cross-sectional view of the phase adjustment mechanism 7. The adjustment nut 24 is an annular member and has a female screw portion 34 that meshes with the male screw portion 33. A rotating member 26 is attached to the adjustment nut 24 by bolts and nuts 28. Furthermore, in the present embodiment, a first clutch member 41 and an annular spacer 27 included in the clutch portion 25 are attached to the adjustment nut 24 by bolts and nuts 28. By rotating the rotation member 26, the adjustment nut 24, the first clutch member 41, and the annular spacer 27 can be integrally rotated together with the rotation member 26. The operator can rotate the adjusting nut 24 by inserting a jig (not shown) into the hole 26 a formed in the rotating member 26 and rotating the rotating member 26.

  The rotation of the adjustment nut 24 can displace the first connection body 21 that cannot be rotated in the axial direction with respect to the second connection body 22. By displacing the first connecting body 21 in the axial direction, the second connecting body 22 can be rotated by the action of the helical splines 31 and 32, thereby outputting to the input flange 4 (see FIG. 1). It becomes possible to change (adjust) the phase of the flange 5.

  The clutch portion 25 includes an annular first clutch member 41 that can rotate integrally with the adjustment nut 24, an annular second clutch member 42, and a switch 43. The switch 43 according to the present embodiment includes an operation bolt 44 and a nut member 45 having a threaded portion that meshes with the operation bolt 44. The operation bolt 44 and the nut member 45 allow the first clutch member 41 and the second clutch member 43 to be connected to each other. It is possible to switch between a state in which the clutch member 42 is connected so as to be integrally rotatable and a state in which this connection is released. The second clutch member 42 is attached to the flange portion 38 of the second connecting body 22 via the sleeve 46 and can rotate integrally with the second connecting body 22.

  FIG. 4 is an explanatory diagram for explaining the joint surface 48 of the first clutch member 41 and the joint surface 49 of the second clutch member 42. A plurality of convex portions 50 are provided on one of the joint surface 48 and the joint surface 49 at intervals in the circumferential direction, and on the other side, a concave portion 51 fitted with the convex portion 50 is disposed in the circumferential direction. A plurality are formed. The first clutch member 41 can be made non-rotatable with respect to the second clutch member 42 by fitting the convex portion 50 and the concave portion 51 together. Then, by releasing this fitting, the first clutch member 41 can rotate with respect to the second clutch member 42, and the adjustment nut 24 can be rotated.

In FIG. 3, when the adjustment nut 24 is rotated, the second clutch member 42 is moved relative to the first clutch member 41 by loosening the space between the nut member 45 and the operation bolt 44. Thus, the second clutch member 42 and the first clutch member 41 can be rotated relative to each other in the axial direction (left side in FIG. 3). Accordingly, the phase adjustment can be performed by rotating the rotation member 26 and the adjustment nut 24.
On the other hand, when the phase adjustment is completed and torque is transmitted by the drive shaft 3 for the rolling operation by the rolling mill, the second clutch member 42 is made to be the first clutch by tightening the nut member 45 and the operation bolt 44. The member 41 cannot be separated in the axial direction. Thereby, the state in which the convex portion 50 and the concave portion 51 shown in FIG. 4 are fitted is maintained, and the first clutch member 41 and the second clutch member 42 are switched to a state in which relative rotation is impossible. Thus, torque transmission between the first connection body 21 and the second connection body 22 is performed between the first clutch member 41 and the second clutch member 42, and between the first helical spline 31 and the second helical spline 32. Torque transmission by the drive shaft 3 becomes possible.

As described above, the clutch portion 25 allows the rotation of the adjustment nut 24 relative to the second connection body 22 by disengaging or joining the first clutch member 41 and the second clutch member 42, and makes the rotation impossible. And can be switched.
In the present embodiment, as shown in FIG. 3, an annular bush 29 is provided between the spacer 27 and the sleeve 46, and the first clutch member 41, the second clutch member 42, and the like are provided by the bush 29. Relative rotation is supported.

  In the first helical spline 31 and the second helical spline 32, a gap (a radial gap) formed between them is relatively large. For this reason, the bush 23 is provided to support the first connecting body 21 in which the first helical spline 31 is formed and the second connecting body 22 in which the second helical spline 32 is formed in a concentric manner. It has been. In the present embodiment, the bush 23 is a copper alloy, and the other members are made of, for example, carbon steel.

The mounting structure of the bush 23 will be further described.
The first connecting body 21 has a through hole formed in the center thereof, and has a cylindrical shape as a whole. In addition, although not shown in figure, a bottomed cylindrical hole may be sufficient instead of a through-hole, and the 1st connection body 21 has the hollow cylinder part 36 in at least one part. In the present embodiment, the whole is a cylindrical portion 36. A first flange 15 is formed at the end of the cylindrical portion 36.
The second connector 22 has a cylindrical main body 39 having a second helical spline 32 formed on the inner periphery thereof, and extends radially outward from one side of the main body 39 to which the switch 43 is attached. And an annular portion 40 extending radially inward from the other side of the main body 39. The main body portion 39 is located on the radially outer side of the cylindrical portion 36 included in the first connecting body 21. Further, the second connection body 22 has a shaft portion 37 located on the radially inner side of the cylindrical portion 36. The shaft portion 37 and the annular portion 40 are connected by a bolt 54, and the shaft portion 37 and the main body portion 39 are integrated. The second helical spline 32 formed in the cylindrical main body 39 faces the outer peripheral surface 37a of the shaft portion 37 in the radial direction.

An annular space is formed between the outer peripheral surface 37a of the shaft portion 37 and the inner peripheral surface 36a of the cylindrical portion 36, and the cylindrical bush 23 is provided in the annular space. That is, the bush 23 is provided between the inner peripheral surface 36 a of the cylindrical portion 36 and the outer peripheral surface 37 a of the shaft portion 37. In the present embodiment, the bush 23 is attached to the cylindrical portion 36 with a bolt 55. And the inner peripheral surface of this bush 23 and the outer peripheral surface 37a of the axial part 37 slide relatively.
The bush 23 is provided at the same position as the first helical spline 31 in the axial direction. That is, the bush 23 is provided in a radially inner range of the region where the first helical spline 31 is formed, that is, in a range M between two-dot chain lines in FIG.

  Thus, the drive shaft 3 with a phase adjustment function of the present embodiment includes the first connection body 21 in which the first helical spline 31 is formed, and the second connection body 22 in which the second helical spline 32 is formed. Is provided with a bush 23, and the bush 23 has an inner peripheral surface 36 a of the cylindrical portion 36 included in the first connecting body 21 and an outer peripheral surface of the shaft portion 37 included in the second connecting body 22. 37a. Thereby, the bush 23 can be arranged side by side with the helical spline 31 (32) in the radial direction. That is, it is not necessary to arrange the bushes 96, 97 side by side with the helical splines 94a, 95a as in the prior art (see FIG. 7), and in this embodiment, the phase adjustment mechanism 7 is disposed in the axial direction as compared with the prior art. It becomes possible to make it compact.

  In particular, in the present embodiment, since the bush 23 is provided in the radially inner range (M) of the formation region of the first helical spline 31, the bush 23 is disposed radially inward of the first helical spline 31. The first connection body 21 and the second connection body 22 are relatively supported to prevent the connection bodies 21 and 22 from being displaced in the radial direction. Further, since the bushes 23 are provided in the range (M), only one bush 23 is required. That is, it is possible to keep the meshing state of the first helical spline 31 and the second helical spline 32 with one bush 23.

  According to the bush 23, when the operator rotates the adjustment nut 24 through the rotation member 26 for phase adjustment, the first connection body 21 is smoothly displaced in the axial direction with respect to the second connection body 22. This displacement allows the second connection body 22 to rotate with respect to the first connection body 21.

Further, in the phase adjustment mechanism 7 of the present embodiment, an end plate 17 is provided between the first connection body 21 and the second connection body 22, and the end plate 17 allows the operator to adjust the phase. The first connecting member 21 is prevented from being displaced more than necessary with respect to the second connecting member 22 by turning the adjusting nut 24 too much.
That is, the end plate 17 is attached to the shaft portion 37 of the second connection body 22, and a step portion for expanding the inner diameter is formed on the inner peripheral surface 36 a of the cylindrical portion 36 of the first connection body 21. The end plate 17 can abut on the axial direction surface 18 from the axial direction. For this reason, even if the first connecting member 21 tends to be greatly displaced in the left direction in FIG. 3 with respect to the second connecting member 22 due to the rotation of the adjusting nut 24, the axial surface 18 abuts on the end plate 17. Displacement is impossible. Thereby, the adjustment nut 24 does not fall off from the male screw portion 33.
As described above, the phase adjustment mechanism 7 includes the end plate 17 and the axial direction surface 18 as a stopper portion that limits the axial displacement width of the first connection body 21 relative to the second connection body 22.

  Furthermore, in the present embodiment, the clutch portion 25 (joint surfaces 48 and 49 shown in FIG. 4) is located on the radially outer side of the adjustment nut 24. That is, as shown in FIG. 5, the first clutch member 41 includes a first annular portion 41a located on the side surface side of the adjustment nut 24 and an axial direction from the radially outer end of the first annular portion 41a. And a first cylindrical portion 41 b that fits outside the adjustment nut 24, and an axial end surface of the first cylindrical portion 41 b is a joining surface 48. The second clutch member 42 includes a second cylindrical portion 42a that is fitted on the adjustment nut 24 (with a gap), and a second cylindrical portion 42a that extends radially outward from the axial end of the second cylindrical portion 42a. And the end surface in the axial direction of the second cylindrical portion 42 a is a joint surface 49. As described above, the first cylindrical portion 41 b of the first clutch member 41, the second cylindrical portion 42 a and the second annular portion 42 b of the second clutch member 42 are disposed on the radially outer side of the adjustment nut 24.

  As described above, since at least one of the first clutch member 41 and the second clutch portion 42 is disposed on the radially outer side of the adjustment nut 24, the axial dimension of the phase adjustment mechanism 7 can be reduced. It becomes possible. That is, according to this embodiment, at least a part of the clutch portion 25 can be arranged in the radial direction with the adjustment nut 24, and the clutch portion 99 and the adjustment nut 98 and the shaft can be arranged as in the conventional case (see FIG. 7). There is no need to arrange them side by side. As a result, it is possible to contribute to the axial adjustment of the phase adjusting mechanism 7.

  As described above, according to the drive shaft 3 with the phase adjustment function of the present embodiment, for example, in the entire drive shaft 3 (see FIG. 1), even if it is necessary to install the phase adjustment mechanism 7 within a limited axial range, Since the phase adjustment mechanism 7 can be made compact in the axial direction, it can be installed.

Further, the drive shaft 3 with a phase adjusting function of the present invention is not limited to the illustrated form, and may be of another form within the scope of the present invention. For example, in the drive shaft 3 of the above-described embodiment, the drive shaft body 6 functions as an input shaft to which the rotation of the speed reducer (not shown) is input, and the phase adjustment mechanism 7 (part thereof) rotates a roll (not shown). The case of functioning as an output shaft has been described. In addition to this, an input shaft to which the rotation of the speed reducer is input and an output shaft for rotating the roll are provided, and a phase adjustment mechanism is provided between the input shaft and the output shaft. 7 may be a drive shaft with a phase adjustment function.
Further, the position of the bush 23 is between the cylindrical portion 36 and the shaft portion 37 when described with reference to FIG. 3, but may be a position close to the end plate 17. A plurality of bushes 23 may be provided between the cylinder portion 36 and the shaft portion 37.

3: Drive shaft with phase adjustment function 4: Input flange (end of one axial side)
5: Output flange (end on the other side in the axial direction) 6: Drive shaft body 7: Phase adjustment mechanism 17: End plate (stopper)
18: Axial surface (stopper portion) 21: First connecting body 21a: Outer peripheral surface 22: Second connecting body 22a: Inner peripheral surface 23: Bush 24: Adjustment nut 25: Clutch portion 31: First helical spline 32: First 2-helical spline 33: male screw portion 34: female screw portion 36: cylindrical portion 36a: inner peripheral surface 37: shaft portion 37a: outer peripheral surface 39: cylindrical main body portion 41: first clutch member 42: second clutch member 43: switching vessel

Claims (4)

A phase adjustment mechanism that enables adjustment of the phase between one end in the axial direction and the other end in the axial direction,
The phase adjusting mechanism includes a first connection body having a first helical spline and a male screw portion formed on an outer peripheral surface, and a second connection portion provided on a radially outer side of a part of the first connection body and meshing with the first helical spline. Rotating with a second connecting body having a helical spline formed on the inner peripheral surface, a bush for concentrically supporting the first connecting body and the second connecting body, and an internal thread portion engaging with the external thread portion An adjustment nut for displacing the first connection body in the axial direction, and a clutch portion for switching between a state allowing the rotation of the adjustment nut relative to the second connection body and a state disabling the rotation. ,
The first connection body has a cylindrical portion, the second connection body has a cylindrical main body portion positioned on the radially outer side of the cylindrical portion and a shaft portion positioned on the radial inner side of the cylindrical portion, The drive shaft with a phase adjusting function, wherein the bush is provided between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the shaft portion.   The drive shaft with a phase adjusting function according to claim 1, wherein the bush is provided in a radially inner range of a region where the first helical spline is formed. The clutch portion connects the first clutch member that rotates integrally with the adjustment nut, the second clutch member that rotates integrally with the second connector, and the first clutch member and the second clutch member so as to be integrally rotatable. A switching device for switching between the connected state and the disconnected state,
3. The drive shaft with a phase adjustment function according to claim 1, wherein at least one of the first clutch member and the second clutch member is disposed on a radially outer side of the adjustment nut.   4. The phase adjustment mechanism according to claim 1, wherein the phase adjustment mechanism further includes a stopper portion that limits an axial displacement width of the first connection body relative to the second connection body. Drive shaft.

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