JP6387254B2 - Bearing device and roll device - Google Patents

Description

  The present invention relates to a spherical bearing, and more particularly to a spherical bearing suitable for a bearing device of a roll device that supports a roll in a non-contact manner.

  There is known a spherical bearing that supports a support object having a spherical surface so as to be rotatable with respect to a center of a sphere defined by the spherical surface. For example, in Patent Document 1, the convex spherical sliding surface (support target surface) of the internal holder (support target) in which the insertion hole for holding the shaft is formed is formed of a thin film layer of a uniform TiAlN compound. A bearing device in which a concave spherical sliding surface (bearing surface) of an external holder (spherical bearing) is formed of a polytetrafluoroethylene-based liner is disclosed. The outer holder supports the inner holder in a rotatable manner with respect to the center of the sphere defined by the convex spherical sliding surface of the inner holder, so that the shaft inserted into the insertion hole is inserted into the inner holder. Inclined and rotatably held.

  Moreover, the roll apparatus provided with a pair of bearing apparatus which supports the both ends of a roll and a roll rotatably is used for conveyance of a tape, a sheet | seat, a film, etc. In such a roll device, a bearing device using a spherical bearing described in Patent Document 1 is suitable as a pair of bearing devices that support both ends of the roll. Since the bearing device using the spherical bearing described in Patent Document 1 holds the shaft of the roll inserted into the insertion hole of the internal holding portion in an inclined and rotatable manner, the displacement of the installation position between the bearing devices and the deflection of the roll Etc. can be absorbed.

JP 2005-30492 A

  However, in the bearing device described in Patent Document 1, the external holder that is a spherical bearing is a sliding bearing, and a concave spherical sliding surface that is a bearing surface is a convex spherical surface that is a support target surface of an internal holding portion that is a support target. In sliding contact with the sliding surface. For this reason, a frictional force is generated between the concave spherical sliding surface of the external holder and the convex spherical sliding surface to be supported, thereby hindering smooth rotation of the roll.

The present invention has been made in view of the above circumstances, and its object is supported available-bearing device in inclination and rotatably non-contact support object, and to provide a roll apparatus using the bearing device is there.

In order to solve the above problems, in the bearing device of the present invention, the concave spherical bearing surface is formed of a porous sintered layer, and the compressed gas is supplied to the porous sintered layer, whereby the compressed gas is supplied to the concave spherical surface. A spherical bush having a convex spherical support target surface formed on the outer peripheral surface thereof is supported in a non-contact manner by a pair of spherical bearings ejected from the entire surface of the cylindrical bearing surface, and the shaft is inserted into the spherical bush so that the shaft Is held tilted and rotatable.

For example, the bearing device of the present invention is a bearing device that supports a shaft,
A spherical bush mounted on the shaft and having a convex spherical support target surface formed on the outer peripheral surface;
A concave spherical bearing surface that faces the convex spherical support target surface of the spherical bush, and a pair of spherical bearings that support the spherical bush in a non-contact manner ,
It said pair of ball surface bearings,
The concave spherical bearing surfaces face each other so as to form a spherical surface of the same sphere,
Each,
A porous sintered layer having the concave spherical bearing surface facing the convex spherical support target surface;
A base metal of the porous sintered layer in which a ventilation path for supplying compressed gas to the porous sintered layer is formed, and
A through hole is formed in the base metal,
The porous sintered layer is formed on the inner wall surface of the through hole of the base metal,
The spherical bush is
The pair of spherical bearings are disposed between the concave spherical bearing surfaces.

  Moreover, in the roll apparatus of this invention, the shaft connected with the roll is inserted in the insertion hole of the spherical bush of the said bearing apparatus, and a roll is hold | maintained so that inclination and rotation are possible without contact.

For example, the roll device of the present invention is a roll device that supports a roll in a non-contact manner,
A shaft coupled to the roll;
And the bearing device for supporting the shaft.

  According to the present invention, the concave spherical bearing surface is formed of a porous sintered layer, compressed gas is supplied to the porous sintered layer, and the compressed gas is ejected from the entire surface of the concave spherical bearing surface. The support target having the convex spherical support target surface facing the concave spherical bearing surface can be supported in a non-contact manner. For this reason, no frictional force is generated between the concave spherical bearing surface and the convex spherical support target surface, and smooth rotation of the support target can be realized. Therefore, by holding the shaft on the object to be supported, the shaft can be held in an inclined and rotatable manner, and a spherical bearing suitable for a bearing device of a roll device that supports the roll in a non-contact manner can be provided.

FIG. 1 is a front view in which a part of a roll apparatus 1 according to an embodiment of the present invention is omitted and partially cut. FIG. 2 is a side view of the roll apparatus 1 shown in FIG. FIG. 3 is a front view in which a part of the roll 2 is omitted. 4A is a plan view of the bearing device 3, and FIG. 4B is a cross-sectional view taken along the line AA of the bearing device shown in FIG. 4A. FIG. 5A is a plan view of the spherical bush 4 to which the cylindrical bush 5 is attached, and FIG. 5B is a B− of the spherical bush 4 to which the cylindrical bush 5 shown in FIG. 5A is attached. It is B sectional drawing. 6A is a plan view of the first spherical bearing 6a, and FIG. 6B is a cross-sectional view of the first spherical bearing 6a shown in FIG. FIG. 7A is a plan view of the second spherical bearing 6b, and FIG. 7B is a DD cross-sectional view of the second spherical bearing 6b shown in FIG. 7A. 8A is a front view of the housing 7, and FIG. 8B is an EE cross-sectional view of the housing 7 shown in FIG. 8A. FIG. 9 is an enlarged view of the F part in FIG. 1, and is a diagram schematically showing a support state of the roll 2 during supply of air to the bearing device 3.

  Hereinafter, an embodiment of the present invention will be described.

  FIG. 1 is a front view in which a part of the roll device 1 according to the present embodiment is omitted and partially cut away, and FIG. 2 is a side view of the roll device 1 shown in FIG.

  As illustrated, the roll device 1 according to the present embodiment includes a roll 2, a pair of bearing devices 3 that support the roll 2, a pair of housings 7 that hold the respective bearing devices 3, and each bearing device 3. And a pair of stoppers 8 for preventing the housing 7 from falling off.

  FIG. 3 is a front view in which a part of the roll 2 is omitted.

  As shown in the figure, the roll 2 includes a roll body 20 for transporting a transported object such as a tape, a sheet, and a film, and shafts 21 integrally formed on both end faces 22 of the roll body 20. Yes. The shaft 21 is formed so as to protrude from both end faces 22 of the roll body 20 coaxially with the roll body 20. The shaft 21 is a stepped shaft having a root portion (connecting portion with the end surface 22 of the roll body 20) 23 having a diameter larger than that of the tip portion 24. For this reason, the root portion 23 and the tip portion 24 of the shaft 21 A stepped surface 25 is formed at the connecting portion.

  4A is a plan view of the bearing device 3, and FIG. 4B is a cross-sectional view taken along the line AA of the bearing device shown in FIG. 4A.

  As shown in the drawing, the bearing device 3 includes a spherical bush 4 to which a tip end 24 of a shaft 21 of a roll 2 is slidably inserted and a spherical bush 4 that is mounted in a non-contact manner. A spherical bearing 6a and a second spherical bearing 6b are provided.

  FIG. 5A is a plan view of the spherical bush 4 to which the cylindrical bush 5 is attached, and FIG. 5B is a B− of the spherical bush 4 to which the cylindrical bush 5 shown in FIG. 5A is attached. It is B sectional drawing.

  As illustrated, the spherical bush 4 has a through hole 40 in which the cylindrical bush 5 is mounted. In this embodiment, the two cylindrical bushes 5 are mounted in the through holes 40 of the spherical bush 4, but it is sufficient that at least one cylindrical bush 5 is mounted in the through holes 40 of the spherical bush 4. Further, on the outer peripheral surface 41 of the spherical bush 4, a part of a sphere centering on an arbitrary point on the axis O of the through hole 40 (preferably a point on the axis O located at the center of the through hole 40). A convex spherical support target surface 42 is formed.

  A sliding bearing surface 51 is formed on the inner peripheral surface 50 of the cylindrical bush 5. The sliding bearing surface 51 is in sliding contact with the outer peripheral surface 26 of the distal end portion 24 of the shaft 21 of the roll 2 inserted into the cylindrical bush 5.

  6A is a plan view of the first spherical bearing 6a, and FIG. 6B is a cross-sectional view of the first spherical bearing 6b shown in FIG. 6A taken along the line C-C.

  As shown in the figure, the first spherical bearing 6a includes a porous sintered layer 60a and a base metal (back metal) 61a of the porous sintered layer 60a.

  The base 61a is formed in a disc shape and includes a truncated cone-shaped through hole 610a in which an annular groove 615a is formed in the inner wall 614a. A small diameter opening side end surface 611a which is an end surface of the base metal 61a located on the small diameter opening side of the through hole 610a has a large diameter opening side end surface which is an end surface of the base metal 61a located on the large diameter opening side of the through hole 610a. A plurality of counterbore through holes 613a penetrating 612a are formed at equal intervals. Further, the metal base 61a is formed with an annular groove 615a formed in the inner wall 614a of the through hole 610a from the small diameter opening side end surface 611a and a ventilation path 616a connected to the large diameter opening side end surface 612a.

  The porous sintered layer 60a is formed on the inner wall 614a of the through hole 610a of the base metal 61a, and the surface 600a of the porous sintered layer 60a is not covered by the first spherical bearing 6a and the second spherical bearing 6b. A sphere that is concentric with the sphere that forms the convex spherical support target surface 42 formed on the outer peripheral surface 41 of the spherical bush 4 supported by contact (slightly larger in diameter than the sphere that forms the convex spherical support target surface 42) A concave spherical bearing surface 601a constituting a part of a sphere) is formed. The concave spherical bearing surface 601a is formed, for example, by forming a porous sintered layer 60a with a uniform thickness on an inner wall 614a of a through hole 610a formed in a truncated cone shape, and the surface of the porous sintered layer 60a. It is formed by cutting 600a.

  FIG. 7A is a plan view of the second spherical bearing 6b, and FIG. 7B is a DD cross-sectional view of the second spherical bearing 6b shown in FIG. 7A.

  As illustrated, the second spherical bearing 6b also includes a porous sintered layer 60b and a base metal (back metal) 61b of the porous sintered layer 60b, like the first spherical bearing 6a.

  The base 61b is formed in a disk shape having substantially the same diameter as the base 61a, and includes a truncated cone-shaped through hole 610b in which an annular groove 615b is formed in the inner wall 614b. In the large-diameter opening side end surface 612b, which is the end surface of the base metal 61b located on the large-diameter opening side of the through hole 610b, each countersink through-hole 613a in the large-diameter opening side end surface 612a of the base metal 61a of the first spherical bearing 6a. A screw hole 613b that is screwed into the bolt 8 inserted into the counterbore through hole 613a is formed at a position corresponding to. Further, in the large diameter opening side end surface 612b of the base metal 61b, the inner wall 614b of the through hole 610b is formed at a position corresponding to the air passage 616a in the large diameter opening side end surface 612a of the base metal 61a of the first spherical bearing 6a. An air passage 616b connected to the annular groove 615b is formed.

  The porous sintered layer 60b is formed on the inner wall 614b of the through hole 610b of the base metal 61b, and the surface 600b of the porous sintered layer 60b has the porous sintered layer 60a of the first spherical bearing 6a. The convex spherical support target surface 42 formed on the outer peripheral surface 41 of the spherical bush 4 supported in a non-contact manner by the first spherical bearing 6a and the second spherical bearing 6b together with the concave spherical bearing surface 601a formed on the surface 600a. Concave spherical bearing surface 601b that forms part of a spherical body that is concentric with the spherical body that constitutes (a spherical body that is slightly larger in diameter than the spherical body that constitutes the convex spherical surface to be supported 42) is formed. The concave spherical bearing surface 601b is formed, for example, by forming a porous sintered layer 60b with a uniform thickness on an inner wall 614b of a through hole 610b formed in a truncated cone shape, and the surface of the porous sintered layer 60b. It is formed by cutting 600b.

  A concave spherical bearing in which the convex spherical support target surface 42 formed on the outer peripheral surface 41 of the spherical bush 4 to which the cylindrical bush 5 is mounted is formed on the surface 600a of the porous sintered layer 60a of the first spherical bearing 6a. Between the first spherical bearing 6a and the second spherical bearing 6b so as to face each of the concave spherical bearing surface 601b formed on the surface 601a and the surface 600b of the porous sintered layer 60b of the second spherical bearing 6b. The spherical bush 4 is sandwiched between the large spherical opening side end surface 612a of the first spherical bearing 6a and the large spherical opening side end surface 612b of the second spherical bearing 6b so that they are formed on the base metal 61a of the first spherical bearing 6a. The bolt 8 is inserted into the countersunk through hole 613a, and the bolt 8 is screwed into the screw hole 613b formed in the base 61b of the second spherical bearing 6b, and the first spherical bearing 6a and the second spherical bearing 6b. Concatenate The Rukoto, the bearing device 3 is assembled as shown in FIG.

  8A is a front view of the housing 7, and FIG. 8B is an EE cross-sectional view of the housing 7 shown in FIG. 8A.

  The housing 7 is formed with a through hole 70 for holding the bearing device 3 penetrating from one surface 71 to the other surface 72 and a screw hole 73 for attaching the stopper 8 formed on the one surface 71 side. ing. The through hole 70 of the housing 7 is a stepped hole having a step 74 for preventing the bearing device 3 from coming off, and has a large diameter portion 75 larger in diameter than the inner diameter of the annular stopper 8. The bearing device 3 is inserted into the through hole 70 from one surface 71 of the housing 7 and brought into contact with the step 74 to be accommodated in the large diameter portion 75 of the through hole 70, and at the same time, the one surface 71 of the housing 7. The stopper 8 is disposed on the stopper 8, the bolt 92 is screwed into the screw hole 73 for attaching the stopper 8 through the stopper 8, and the stopper 8 is attached to the one surface 71 of the housing 7. The bearing device 3 accommodated in the diameter portion 75 is fixed to the housing 7.

  The tip 24 of the shaft 21 of the roll 2 is inserted into the cylindrical bush 5 of the bearing device 3 fixed to the housing 7 as described above. The respective ends 24 of the shaft 21 projecting from the both end faces 22 of the roll body 20 of the roll 2 are inserted into the cylindrical bush 5 of the bearing device 3 fixed to the housing 7, whereby the roll 2 is shown in FIG. In this way, it is supported by the pair of bearing devices 3.

  Next, in the roll device 1 having the above-described configuration, the support state of the roll 2 during supply of air to the bearing device 3 will be described.

  FIG. 9 is an enlarged view of the F part in FIG. 1, and is a diagram schematically showing a support state of the roll 2 during supply of air to the bearing device 3.

  As shown in the figure, in the roll device 1, when compressed gas is supplied from a pump (not shown) to the air passage 616a formed in the first spherical bearing 6a of the bearing device 3, the base of the first spherical bearing 6a. The compressed gas is uniformly discharged from the concave spherical bearing surface 601a of the porous sintered layer 60a through the annular groove 615a formed in the inner wall 614a of the through hole 610a of the gold 61a. The compressed gas supplied to the air passage 616a formed in the metal base 61a of the first spherical bearing 6a is supplied to the air passage 616b formed in the metal base 61b of the second spherical bearing 6b of the bearing device 3. Then, it is uniformly discharged from the concave spherical bearing surface 601b of the porous sintered layer 60b through the annular groove 615b formed in the inner wall 614b of the through hole 610b of the base 61b of the second spherical bearing 6b. As a result, the concave spherical bearing surface 601a of the porous sintered layer 60a of the first spherical bearing 6a, the concave spherical bearing surface 601b of the porous sintered layer 60b of the second spherical bearing 6b, and the convex spherical surface of the spherical bush 4 are obtained. A compressed gas film is formed in the gap Δt with the surface to be supported 42. As a result, the first spherical bearing 6a and the second spherical bearing 6b rotate the spherical bush 4 through the compressed gas film with respect to the center of the sphere defined by the convex spherical support target surface 42 of the spherical bush 4. Support in a non-contact manner. For this reason, the shaft 21 of the roll 2 inserted into the cylindrical bush 5 mounted in the through hole 40 of the spherical bush 4 is held so as to be inclined and rotatable. Further, the concave spherical bearing surface 601a of the porous sintered layer 60a of the first spherical bearing 6a, the concave spherical bearing surface 601b of the porous sintered layer 60b of the second spherical bearing 6b, and the convex spherical shape of the spherical bush 40 are provided. A friction force is not generated between the support target surface 42 and the roll 2 can be smoothly rotated.

  Further, a sliding bearing surface 51 is formed on the inner peripheral surface 50 of the cylindrical bush 5 mounted in the through hole 40 of the spherical bush 4, and the outer peripheral surface 26 of the tip 24 of the shaft 21 of the roll 2 is formed on the cylindrical bush 5. Therefore, the shaft 21 can be allowed to vary in the thrust direction due to the bending of the roll 2, and thereby the roll 2 can be rotated more smoothly.

  The embodiment of the present invention has been described above.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above embodiment, the cylindrical bush 5 may be omitted. In this case, it is preferable that a sliding bearing surface is formed on the inner wall of the through hole 40 of the spherical bush 4 and the sliding bearing surface is brought into sliding contact with the outer peripheral surface 26 of the tip 24 of the shaft 21 of the roll 2. When the length of the roll 2 is short and, therefore, it is not necessary to consider the change in the thrust direction of the shaft 21 due to the bending of the roll 2 or the like, a sliding bearing surface is formed on the inner wall of the through hole 40 of the spherical bush 4. Instead, the spherical bush 4 may be attached to the shaft 21 by inserting the shaft 21 into the through hole 40.

  In the above embodiment, the case where the bearing device 3 is used for the roll device 1 has been described as an example, but the present invention is not limited to this. The bearing device of the present invention can be widely applied to devices that support a rotating body in an inclined and rotatable manner without contact. In the above embodiment, the case where the first spherical bearing 6a and the second spherical bearing 6b are used in the bearing device 3 has been described as an example. However, the present invention is not limited to this. The spherical bearing of this invention should just support the support target which has a convex spherical surface support target surface in non-contact.

1: Roll device, 2: Roll, 3: Bearing device, 4: Spherical bush, 5: Cylindrical bush, 6a: First spherical bearing, 6b: Second spherical bearing, 7: Housing, 8: Stopper, 20: Roll body 21: shaft, 22: end face of roll body, 23: shaft root, 24: tip of shaft, 25: stepped surface of shaft, 26: outer peripheral surface of tip of shaft, 40: through hole of spherical bush 41: outer peripheral surface of spherical bush, 42: convex spherical support target surface, 50: inner peripheral surface of cylindrical bush, 51: sliding bearing surface, 60a, 60b: porous sintered layer, 61a, 61b: base metal, 70: Housing through-hole 71, 72: Housing surface 73: Screw hole 74: Step difference in housing through-hole 75: Large diameter portion of housing through-hole 600a, 600b: Porous 601a, 601b: concave spherical bearing surface, 610a, 610b: through hole of base metal, 611a, 611b: end surface on the small diameter opening side, 612a, 612b: end surface on the large diameter opening side, 613a: counterbore Through hole, 613b: Screw hole, 614a, 614b: Inner wall of through hole of base metal, 615a, 615b: annular groove, 616a, 616b: air passage

Claims (6)

A bearing device for supporting a shaft,
A spherical bush mounted on the shaft and having a convex spherical support target surface formed on the outer peripheral surface;
A concave spherical bearing surface that faces the convex spherical support target surface of the spherical bush, and a pair of spherical bearings that support the spherical bush in a non-contact manner,
It said pair of ball surface bearings,
The concave spherical bearing surfaces face each other so as to form a spherical surface of the same sphere,
Each,
A porous sintered layer having the concave spherical bearing surface facing the convex spherical support target surface;
A base metal of the porous sintered layer in which a ventilation path for supplying compressed gas to the porous sintered layer is formed, and
A through hole is formed in the base metal,
The porous sintered layer is formed on the inner wall surface of the through hole of the base metal,
The spherical bush is
The bearing device is disposed between the concave spherical bearing surfaces of the pair of spherical bearings. The bearing device according to claim 1 ,
An inner wall surface of the through hole of the base metal, the bearing apparatus being characterized in that it is formed in a truncated cone shape. The bearing device according to claim 2 ,
The concave spherical bearing surface is:
A bearing device , wherein the bearing device is formed by processing a surface of the porous sintered layer formed on a frustoconical inner wall surface of the through hole of the base metal. The bearing device according to any one of claims 1 to 3 ,
The spherical bush is
A bearing device having a bearing surface in sliding contact with the outer peripheral surface of the shaft on an inner wall of an insertion hole for mounting the shaft. The bearing device according to any one of claims 1 to 3 ,
The spherical bush is
A cylindrical bush inserted into an insertion hole for mounting the shaft;
The shaft is
The bearing device is inserted into the cylindrical bush. A roll device for supporting a roll in a non-contact manner,
A shaft coupled to the roll;
Roll apparatus characterized in that it comprises a bearing device according to any one of claims 1 to 5 for supporting the shaft.

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