JP2012107690A - Fastening mechanism, and phase adjusting mechanism - Google Patents

Abstract

There is provided a fastening mechanism capable of reliably performing fastening and releasing by preventing co-rotation of a nut.
A cylindrical body 5 and an annular body 6 disposed outwardly on one axial side of the outer peripheral surface of the cylindrical body 5 are provided. The annular body 6 includes a first member 1, The first member 1 is disposed on one side in the axial direction, the second member 2 is disposed along the axial direction, and the first member 1 and the second member 2 from one side in the axial direction. The first member 1 and the second member 2 are provided with a bolt 3 disposed through the through hole and a nut 4 that is screwed to the bolt 3 on the other axial side of the annular body 6. Fastening mechanism that closely contacts The nut 4 has an inner peripheral surface and an outer surface made of a female screw, and the outer surface has a single contact surface that contacts the outer peripheral surface of the first member 1. In the contact portion between the outer peripheral surface and the contact surface, the outer peripheral surface and the contact surface have a common tangent, and the contact surface is a flat surface or a curved surface that is recessed toward the inner peripheral surface side. .
[Selection] Figure 1

Description

  The present invention relates to a fastening mechanism and a phase adjustment mechanism.

  The rotation of the motor is transmitted to the pair of upper and lower rolling rolls in the rolling mill via a speed reduction mechanism and a transmission shaft. However, when the speed reduction mechanism and the roll roll stand are far apart (for example, about 2-3 m apart) If there is). In this case, since the transmission shaft becomes long, a relative twist may occur between the shafts of the pair of upper and lower rolling rolls.

A pair of upper and lower rolling rolls are each formed with a pattern for forming a predetermined pattern on the workpiece, and in order to match the phase of the pattern on both the front and back surfaces of the workpiece, a pair of upper and lower rolling The roll phase must be matched.
However, when the relative twist between the two shafts as described above occurs with an increase in the length of the transmission shaft, the phases of the patterns on both surfaces of the workpiece are shifted.

Then, the phase adjustment mechanism which adjusts the phase of a pair of rolling roll is proposed (for example, refer patent document 1).
Such a phase adjusting mechanism is incorporated in the transmission shaft, and generally includes a first cylindrical body and a second cylindrical body fitted into the first cylindrical body, and the first cylindrical body. A torsion spline is formed on the inner peripheral surface of the second cylindrical body and the outer peripheral surface of the second cylindrical body corresponding thereto. And by rotating the operation part which has the internal thread in the internal peripheral surface screwed with the external thread formed in the other part (part different from the part in which the torsion spline was formed) of the outer peripheral surface of the second cylindrical body The second cylindrical body is displaced in the axial direction, and the twisted spline changes the phase of the first cylindrical body, that is, the axis of the rolling roll connected to the first cylindrical body.

Japanese Utility Model Publication No. 63-175318

  By the way, the phase adjustment mechanism described above is provided with a switching mechanism that switches the operation unit between a state in which the operation unit can rotate with respect to the second cylindrical body and a state in which the operation unit cannot be rotated. As shown in FIG. 5, the switching mechanism includes a stepped portion 101 formed at one end of the first cylindrical body 100 and a first cylindrical body disposed on the outer peripheral surface of the first cylindrical body 100. It consists of the clutch part 110 provided between the cyclic | annular body 102 which can be rotated relatively. In addition, a first through hole is formed in the annular body 102 along the axial direction. On the other hand, a second through hole corresponding to the first through hole is also formed in the cylindrical body 103 constituting the operation portion. Yes. A bolt 104 is disposed through the two through holes from the second through hole side toward the first through hole, and a nut 105 is screwed onto the opposite side of the head 104a of the bolt 104. ing. A thrust bearing 120 is disposed between the step portion 101 and the cylindrical body 103.

  The nut 105 is formed of a short cylinder, and the cross section perpendicular to the axial direction has an oval shape in which two opposing portions of the outer periphery of the circle are cut as shown in FIG. On the inner peripheral surface of the nut 105, a female screw that is screwed with the male screw of the bolt 104 is formed, and a cross section (cross section perpendicular to the axial direction) formed on one end side in the axial direction has a circular recess. A coil spring 106 that urges the annular body 102 toward the head 104 a of the bolt 104 is disposed.

  The flat surface 105a of the outer surface of the nut 105 is in contact with the outer peripheral surface 100a of the first cylindrical body 100, and the rotation of the nut 105 is restricted (corotation with the bolt 104 is prevented). When the nut 104 is rotated in the tightening direction, the cylindrical body 103 and the annular body 102 are tightened and brought into close contact with each other by the screwing of the bolt 104 and the nut 105, and the annular body 102 and the step portion 101 are tightened. Adhere to each other. As a result, since the clutch part 110 between the annular body 102 and the step part 101 is engaged, the cylindrical body 103 constituting the operation part is in a fixed state in which it cannot rotate.

  On the other hand, when the bolt 104 is rotated in the loosening direction, the flat surface 105a of the outer surface of the nut 105 is in contact with the outer peripheral surface 100a of the first tubular body 100, and the rotation of the nut 105 is restricted. When the bolt 104 and the nut 105 are screwed together, the nut 105 moves to the right side in FIG. 5 and the tightening of the cylindrical body 103 and the annular body 102 is released. At the same time, the annular body 102 is also movable to the right in FIG. 5 by the distance that the nut 105 has moved. In this state, the annular body 102 is pressed toward the cylindrical body 103 by the urging force of the coil spring 106 and is in contact with the end surface of the cylindrical body 103, but the annular body 102 is urged by the urging force of the coil spring 106. The clutch part 110 between the annular body 102 and the step part 101 can be released. Accordingly, the cylinder 103 can be rotated by releasing the clutch portion.

  A female screw 103 a is formed on the inner peripheral surface of the cylindrical body 103, and a corresponding male screw 107 a is formed on the outer peripheral surface of the cylindrical connecting body 107 fitted in the cylindrical body 103. Further, a torsion spline 108 is formed on the outer peripheral surface of the cylindrical connecting body 107 and the inner peripheral surface of the first cylindrical body 101. For this reason, when the cylindrical body 103 is rotated, the cylindrical body 103 cannot move in the axial direction due to contact with the first cylindrical body 100 via the thrust bearing 120. Is moved in the axial direction, and the first tubular body 100 is rotated in the circumferential direction by the torsion spline 108 due to the movement of the tubular connecting body 107 in the axial direction. Thereby, the phase of the axis | shaft of the roll which is connected with the 1st cylindrical body 100, ie, the said 1st cylindrical body 100, can be changed.

  After the phase adjustment, the nut 105 is moved to the left in FIG. 5 by tightening the bolt 105, and the stepped portion 101 and the annular body 102 are engaged with each other by the clutch portion 110 so that the cylindrical body 103 cannot be rotated. Fix it.

  However, as shown in FIG. 6, the conventional nut 105 has an oval shape in which two opposing portions of the outer peripheral portion of the circle are cut, so that the conventional nut 105 contacts the outer peripheral surface 100 a of the first tubular body 100. The width w of the flat contact surface 105a in contact cannot be increased. That is, since the conventional nut 105 is a two-surface process, the width w of the contact surface 105a is small. For this reason, when the clearance between the outer peripheral surface 100a and the contact surface 105a becomes large due to accumulation of design tolerances of members such as the nut 105 and the first cylindrical body 100, the nut 105 is rotated when the bolt 104 is rotated. May rotate together with the bolt 104, and there is a problem that the phase adjustment operation described above takes time.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fastening mechanism and a phase adjusting mechanism that can reliably perform fastening and release of a member by preventing co-rotation of a nut. Yes.

(1) The fastening mechanism of the present invention includes a cylindrical body and an annular body disposed outwardly on one axial side of the outer peripheral surface of the cylindrical body, and the annular body has an axial direction. A first member in which a first through hole is formed;
A second member which is disposed on one side of the first member in the axial direction and has a second through hole formed along the axial direction;
A bolt disposed through the second through hole and the first through hole from one axial side of the second through hole;
A fastening mechanism comprising a nut screwed to the bolt on the other side in the axial direction of the annular body, and the first member and the second member are brought into close contact with each other by screwing the bolt and the nut;
The nut has an inner peripheral surface made of a female screw that is screwed with a male screw of the bolt, and an outer surface,
The outer surface has a single contact surface that contacts the outer peripheral surface of the first member,
In the contact portion between the outer peripheral surface and the contact surface in a cross section perpendicular to the axial direction, the outer peripheral surface and the contact surface have a common tangent line, and the contact surface is a plane, or It is characterized by a curved surface that is recessed toward the inner peripheral surface side.

  In the fastening mechanism according to the present invention, the contact surface of the nut that contacts the outer peripheral surface of the first member to be fastened is single, that is, the nut is processed on one side, so the width of the contact surface is reduced compared to the conventional case. It can be taken big. As a result, a sufficient contact between the outer peripheral surface of the first member and the contact surface of the nut can be provided, and the rotation of the nut can be reliably prevented when the bolt is rotated.

(2) In the fastening mechanism of (1), a plurality of the bolts are arranged at predetermined intervals along the circumferential direction of the cylindrical body,
The nut is a short cylinder,
It is preferable that the center position of the nut is located radially inward from the PCD of the plurality of bolts. In this case, by shifting the center position of the nut radially inward from the PCD of the plurality of bolts, the nut can be prevented from projecting in the radially outward direction, and interference with other members can be avoided. .

(3) Moreover, the phase adjustment mechanism of the present invention is a phase adjustment mechanism having the fastening mechanism of (1) or (2),
A universal joint is connected to the cylindrical member of the first member,
The second member comprises a cylindrical body coaxial with the first member;
The phase adjustment mechanism is
A cylindrical connection body that is coaxially fitted inside the cylindrical body and the cylindrical body, and in which a transmission shaft that is interlocked with the universal joint is fitted,
A switching mechanism that is switchable between a state in which the second member is allowed to rotate with respect to the cylindrical body of the first member and a state in which the second member is fixed;
A female screw that is screwed with a male screw formed on the outer peripheral surface of the cylindrical connector is formed on the inner peripheral surface of the second member;
The cylindrical connecting body and the corresponding inner peripheral surface of the cylindrical body transmit power from one of the cylindrical connecting body and the cylindrical body to the other, and the axial direction of the cylindrical connecting body. A torsion spline portion that changes the relative phase between the cylindrical connecting body and the cylindrical body by displacement is formed.
In the phase adjustment mechanism of the present invention, the nut contact surface that contacts the outer peripheral surface of the first member to be fastened when adjusting the phase is single, that is, the nut is processed on one side. The width of the contact surface can be increased. As a result, a sufficient contact between the outer peripheral surface of the first member and the contact surface of the nut can be provided, and the rotation of the nut can be reliably prevented when the bolt is rotated.

  According to the fastening mechanism and the phase adjusting mechanism of the present invention, it is possible to securely fasten and release the member by preventing the nut from rotating together.

It is sectional explanatory drawing of one Embodiment of the phase adjustment mechanism of this invention. It is a principal part enlarged view of the phase adjustment mechanism shown by FIG. It is explanatory drawing of the nut in the phase adjustment mechanism shown by FIG. It is explanatory drawing of the other example of a nut. It is sectional explanatory drawing of the conventional phase adjustment mechanism. It is explanatory drawing of the nut in the conventional phase adjustment mechanism.

Hereinafter, embodiments of a fastening mechanism and a phase adjustment mechanism of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional explanatory view of a phase adjustment mechanism P according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of the phase adjustment mechanism shown in FIG. The phase adjustment mechanism P is for adjusting the relative phase of both rolls by rotating the axis of one of the rolls of the pair of rolls with respect to the axis of the other roll, and driving a motor (not shown) It is incorporated in the transmission shaft that transmits the force to the rolling roll. In FIG. 1, the right side is the rolling roll side, and the left side is the motor side.

The phase adjustment mechanism P includes a fastening mechanism F, a cylindrical connecting body 20, and a switching mechanism 30.
The fastening mechanism F includes a first member 1 connected to a universal joint (not shown), a second member 2 closely attached (fastened) to the first member 1, a first member 1 and a second member 2. And a nut 4 to be screwed with the bolt 3.

  The first member 1 includes a cylindrical body 5 that is open on one side (motor side) and an annular body 6 that is disposed outwardly on one side in the axial direction of the outer peripheral surface 5a of the cylindrical body 5. Have. A universal joint (not shown) is connected to the other side (rolling roll side) of the cylindrical body 5.

  The annular body 6 is rotatable relative to the cylindrical body 5, and three first through holes 7 are formed at predetermined intervals along the circumferential direction. The first through hole 7 passes through the annular body 6 in the axial direction.

  A stepped portion 8 that protrudes slightly radially outward from the outer peripheral surface 5 a of the tubular body 5 is formed at the opening side end of the tubular body 5, and the other axial side of the stepped portion 8 ( A clutch portion constituting the switching mechanism 30 is formed between a side surface on the rolling roll side) and a side surface on one axial side of the annular body 6. The clutch portion includes a chevron-shaped convex portion formed on one side surface and a chevron-shaped concave portion formed on the other side surface, and the step portion 8 and the annular body 6 in a state where the convex portion and the concave portion are engaged with each other. Is fixed in a state where the second member 2 cannot rotate. In addition, a twisted spline portion 5 b is formed on the inner peripheral surface of the cylindrical body 5.

  The second member 2 includes a cylindrical body 10 that is in contact with a side surface on one side in the axial direction of the annular body 6, a nut portion 11 that is formed of a short cylindrical body and has an internal thread 11 a formed on an inner peripheral surface, and a cylindrical connecting body. The cover part 12 which forms the seal part 21 with the outer peripheral surface 20a of 20 is comprised. The second member 2 is disposed on one side of the first member 1 in the axial direction. In the present embodiment, the cylinder 10, the nut portion 11, and the cover portion 12 are separate from each other, and the bolt 3 Have been united. A thrust bearing 15 is disposed between the step portion 8 and the nut portion 11.

  Second through holes 13 corresponding to the first through holes 7 are formed in the cylindrical body 10, the nut portion 11, and the cover portion 12 constituting the second member 2 at predetermined intervals along the circumferential direction.

  The bolt 3 is disposed so as to penetrate the second through hole 13 and the first through hole 7 from one axial side of the second through hole 13. A nut 4 is screwed to the bolt 3, and this nut 4 is screwed to the bolt 3 on the other axial side of the annular body 6.

The nut 4 is formed of a short cylinder, and has an inner peripheral surface 4 a on which a female screw that is screwed with the male screw 3 a of the bolt 3 is formed, and an outer surface 22. As shown in FIG. 3, the outer surface 22 has a single contact surface 22 a that contacts the outer peripheral surface 5 a of the cylindrical body 5 of the first member 1. As described above, the conventional nut is a two-surface process in which two opposing portions of the outer peripheral portion of the cylindrical body are cut, and thus the width of the contact surface cannot be increased. Then, since it is a one-surface process in which only one portion of the outer peripheral portion of the cylindrical body is cut, the width W of the contact surface 22a can be made larger than the conventional one.
The contact surface 22a and the outer peripheral surface 5a of the cylindrical body 5 have a common tangent t at the contact portion between the outer peripheral surface 5a and the contact surface 22a in a cross section perpendicular to the axial direction.

  Moreover, in this Embodiment, as FIG. 3 shows, the center position O of the nut 4 is located in the radial inside rather than PCD of the three volt | bolts 3. As shown in FIG. Thus, by shifting the center position O of the nut 4 radially inward from the PCD of the bolt 3, the nut 4 can be prevented from projecting in the radially outward direction. Interference can be avoided.

  A recess 23 having a circular cross section perpendicular to the axial direction is formed on one end side of the nut 4 in the axial direction. The annular body 6 is attached to the head 3b of the bolt 3 in the recess 23. An energizing coil spring 24 is disposed. A nut 25 as a stopper for restricting the movement of the nut 4 during phase adjustment is screwed in the vicinity of the end of the bolt 3 opposite to the head 3b.

  The cylindrical connecting body 20 is coaxially fitted inside the first member 1 and the second member 2, and a transmission shaft 40 interlocked with the universal joint is fitted therein. The outer peripheral surface of the transmission shaft 40 and the inner peripheral surface of the cylindrical connecting body 20 are spline-coupled, and the cylindrical connecting body 20 can move in the axial direction but cannot move in the circumferential direction.

  Further, on the outer peripheral surface 20 a of the cylindrical connecting body 20, a male screw 41 that is screwed with the female screw 11 a formed on the inner peripheral surface of the nut portion 11 of the second member 2 is formed. Further, a twisted spline portion 42 corresponding to the twisted spline portion 5b formed on the inner peripheral surface of the cylindrical body 5 of the first member 1 is formed on the end side in the axial direction further than the male screw 41. Yes. The twisted spline portions 5b and 42 enable power transmission from one of the cylindrical connecting body 20 and the cylindrical body 5 to the other, and the cylindrical connecting body 20 is displaced by the axial displacement of the cylindrical connecting body 20. The relative phase between 20 and the cylindrical body 5 can be changed.

Next, a phase adjustment procedure by the phase adjustment mechanism P having the above configuration will be described.
First, the bolt 3 is rotated in the loosening direction. At that time, the first through hole 7 and the second through hole 13 through which the bolt 3 is inserted are so-called fool holes, the bolt 3 is screwed with the nut 4, and the nut 4 is connected to the nut 4. Since the abutting surface 22 a abuts on the outer peripheral surface 5 a of the cylindrical body 5, it does not rotate with the bolt 3. Therefore, when the bolt 3 is loosened, the nut 4 moves to the right in FIG.

  When the nut 4 moves in the right direction in FIG. 1, the clutch portion between the side surface on one side in the axial direction of the annular body 6 and the side surface on the other side in the axial direction of the step portion 8 can be released. The second member 2 is in a rotatable state. That is, when the nut 4 moves in the right direction in FIG. 1, the annular body 12 is pressed toward the step portion 8 by the coil spring 24 disposed in the recess 23 of the nut 4. It can move rightward in FIG. 1 against the urging force of the coil spring 24. Accordingly, the second member 2 can be rotated by releasing the clutch portion.

  Since the second member 2 cannot move in the axial direction due to contact with the cylindrical body 5 of the first member 1 via the thrust bearing 15, the second member 2 is rotated when the second member 2 is rotated. The cylindrical connecting body 20 having the male screw 41 screwed with the female screw 11a of the second nut portion 11 on the outer peripheral surface moves in the axial direction. Since the cylindrical connecting body 22 is spline-coupled with the transmission shaft 40, the rotation is restricted but the movement in the axial direction is allowed.

  When the cylindrical connecting body 20 moves in the axial direction, torsion spline portions 42 and 5b are formed on the outer peripheral surface of the cylindrical connecting body 20 and the inner peripheral surface of the cylindrical body 5 of the first member 1, respectively. Therefore, the cylindrical body 5 of the 1st member 1 rotates, and the axis | shaft of the rolling roll connected with the said cylindrical body 5 via a universal joint rotates. Thereby, the axis | shaft of one rolling roll of a pair of rolling roll can be rotated relatively with respect to the axis | shaft of the other rolling roll, and the phase of the said pair of rolling roll can be adjusted.

  When the bolt 3 is rotated in the tightening direction after the adjustment of the predetermined amount of phase is completed, the nut 4 does not rotate with the bolt 3 as described above, so the nut 4 moves to the left in FIG. The annular body 12 of the first member 1 and the cylindrical body 10 of the second member 2 are brought into close contact with each other. As a result, the clutch part is engaged, and the rotation of the second member 2 is prohibited.

<Other variations>
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, in the above-described embodiment, the contact surface 22a of the nut 4 that is screwed with the bolt 3 to fasten the first member 1 and the second member 2 is a flat surface, but as shown in FIG. A curved surface that is recessed toward the inner peripheral surface side of the nut 34 can also be used. Even in this case, since the contact surface 34a of the nut 34 and the outer peripheral surface 5a of the cylindrical body 5 of the first member 1 can be sufficiently contacted, the rotation of the nut 34 can be reliably prevented. Can do.

In the embodiment described above, the number of the bolts 3 is three, but may be two, or four or more.
In the above-described embodiment, the cylindrical body 10, the nut portion 11, and the cover portion 12 constituting the second member 2 are separated, but two or more of these members can be integrated. .

1: first member, 2: second member, 3: bolt, 3a: male screw, 3b: head, 4: nut, 5: cylindrical body, 5a: outer peripheral surface, 5b: torsion spline part, 6: annular body , 7: first through hole, 8: stepped portion, 10: cylindrical body, 11: nut portion, 11a: female screw, 12: cover portion, 13: second through hole, 15: thrust bearing, 20: cylindrical connecting body 20a: outer peripheral surface, 21: seal portion, 22: outer surface, 22a: contact surface, 23: recess, 24: coil spring, 25: nut, 30: switching mechanism, 40: transmission shaft, 41: male screw, 42 : Torsion spline part, P: Phase adjustment mechanism, F: Fastening mechanism

Claims (3)

A cylindrical body and an annular body disposed outwardly on one axial side of the outer circumferential surface of the cylindrical body, and a first through hole in the axial direction is formed in the annular body. One member;
A second member which is disposed on one side of the first member in the axial direction and has a second through hole formed along the axial direction;
A bolt disposed through the second through hole and the first through hole from one axial side of the second through hole;
A fastening mechanism comprising a nut screwed to the bolt on the other side in the axial direction of the annular body, and the first member and the second member are brought into close contact with each other by screwing the bolt and the nut;
The nut has an inner peripheral surface made of a female screw that is screwed with a male screw of the bolt, and an outer surface,
The outer surface has a single contact surface that contacts the outer peripheral surface of the first member,
In the contact portion between the outer peripheral surface and the contact surface in a cross section perpendicular to the axial direction, the outer peripheral surface and the contact surface have a common tangent line, and the contact surface is a plane, or A fastening mechanism characterized by a curved surface that is recessed toward the inner peripheral surface. A plurality of the bolts are arranged at predetermined intervals along the circumferential direction of the cylindrical body,
The nut is a short cylinder,
The fastening mechanism according to claim 1, wherein a central position of the nut is located radially inward from a PCD of the plurality of bolts. A phase adjusting mechanism having the fastening mechanism according to claim 1 or 2,
A universal joint is connected to the cylindrical member of the first member,
The second member comprises a cylindrical body coaxial with the first member;
The phase adjustment mechanism is
A cylindrical connection body that is coaxially fitted inside the cylindrical body and the cylindrical body, and in which a transmission shaft that is interlocked with the universal joint is fitted,
A switching mechanism that is switchable between a state in which the second member is allowed to rotate with respect to the cylindrical body of the first member and a state in which the second member is fixed;
A female screw that is screwed with a male screw formed on the outer peripheral surface of the cylindrical connector is formed on the inner peripheral surface of the second member;
The cylindrical connecting body and the corresponding inner peripheral surface of the cylindrical body transmit power from one of the cylindrical connecting body and the cylindrical body to the other, and the axial direction of the cylindrical connecting body. A phase adjustment mechanism, characterized in that a torsion spline portion that changes a relative phase between the cylindrical connecting body and the cylindrical body is formed by displacement.

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