JP3928912B2 - Rotating shaft coupling mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary shaft coupling mechanism for coupling and driving a rotary shaft such as a rolling roll of a rolling mill.
[0002]
[Prior art]
A rolling roll of the rolling mill is connected to a motor via a universal joint and is rotated by a driving force of the motor. However, since the roll surface is worn with use, the roll needs to be replaced as appropriate. Therefore, as shown in FIGS. 4 and 5, a cylindrical roll coupling 2 is provided on one end side of the universal joint, and an oval connection with an oval cross section formed at the shaft end of the rolling roll 1. The portion 1a is fitted into an oval inner hole 2a having an oval cross section formed in the roll coupling 2. Since the oval inner hole 2a of the roll coupling 2 is formed to be slightly larger than the oval connecting portion 1a of the rolling roll 1, the oval connecting portion 1a can be easily attached and detached when the rolling roll 1 is replaced. Can do. Further, since the oval connecting portion 1a is fitted into the oval inner hole 2a having an oval cross section, the flat portions 2b and 1b are engaged with each other, and the rotational torque from the roll coupling 2 side is reduced to the rolling roll. 1 can be surely communicated.
[0003]
However, since there is a gap for attachment and detachment between the oval inner hole 2a of the roll coupling 2 and the oval connecting portion 1a of the rolling roll 1, if the rolling operation is performed as it is, the rolling roll 1 There is a risk that wobbling or the like may occur on the surface of the rolled product due to vibration caused by rattling during rotation. For this reason, conventionally, the roll coupling 2 is externally fitted with a sleeve 3 with a hydraulic expansion chamber on the outer periphery of the cylinder, and the oval inner hole 2a is contracted by the compression of the sleeve 3 with the hydraulic expansion chamber. The backlash of the rolling roll 1 is eliminated by pressing and fixing the connecting portion 1a.
[0004]
The sleeve 3 with a hydraulic expansion chamber is formed with a hydraulic expansion chamber 3a formed of a thin cylindrical space over the entire circumference in a portion very close to the inner peripheral surface of the cylindrical steel material, and is open to the outer peripheral surface. By applying a high hydraulic pressure from the hydraulic port 3b, the hydraulic expansion chamber 3a is expanded so that the diameter of the inner peripheral surface can be contracted.
[0005]
[Problems to be solved by the invention]
However, as shown in FIG. 6, the sleeve 3 with the hydraulic expansion chamber compresses the outer peripheral surface of the roll coupling 2 evenly when the hydraulic expansion chamber 3a expands and the diameter of the inner peripheral surface contracts as a whole. become. However, the cylindrical roll coupling 2 has an outer peripheral surface that is circumferential, but the inner peripheral surface is formed with an oval inner hole 2a having an oval cross section. The wall thickness at both planar portions 2b is particularly thicker than the circumferential portion. Accordingly, when the outer circumference of the roll coupling 2 having a non-uniform thickness is pressed evenly, the oval-shaped inner hole 2a has the two flat portions 2b having a large thickness and high rigidity as shown in FIG. Therefore, the circumferentially thin portion having a small thickness and low rigidity tends to be deformed so as to bulge outward.
[0006]
For this reason, the oval connecting portion 1a of the rolling roll 1 is securely sandwiched between the two flat surface portions 2b of the oval inner hole 2a of the roll coupling 2 with respect to the two flat surface portions 1b. The circumferential portion of the portion 1a is not sufficiently clamped by the circumferential portion of the oval inner hole 2a, and in some cases, a gap is generated here, so that the rolling roll 1 is circumferentially connected to the oval connecting portion 1a during the rolling operation. There was a problem that there was a risk of rattling in the direction.
[0007]
In addition, by forming grooves 2d as shown in FIG. 8 in both flat surface portions 2b of the oval inner hole 2a of the roll coupling 2 or forming slits or the like to weaken the rigidity of this portion, the rolling roll An invention for securely holding one oval connecting portion 1a has also been made (Patent Publication No. 2694683). However, even in such a configuration, the thickness of the two flat portions 2b of the oval inner hole 2a is still thick in a portion where there is no groove 2d, slits, or the like. However, the problem that the compression force at the circumference is weak cannot be solved sufficiently. In addition, when the sleeve 3 with the hydraulic expansion chamber presses the outer peripheral surface of the roll coupling 2, stress is easily concentrated on the edge of the groove 2d and the slit, so that only these edge portions are in the oval connecting portion 1a. There is also a problem that it is pinched by point contact or line contact and cannot be securely pinched by surface contact of the flat surface portion 2b.
[0008]
The present invention has been made in view of such circumstances, and can rotate the oval connecting portion of the rotating shaft reliably by contracting the oval inner hole of the cylindrical portion of the connected member evenly. The object is to provide a shaft coupling mechanism.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an oval connecting portion at a shaft end portion of a rotating shaft formed in a cross-sectional oval shape in which both sides of a circumferential outer peripheral surface are scraped by planes substantially parallel to each other along an axis. , Inserted into the oval inner hole of the tubular portion of the connected member formed in an oval shape having a slightly larger cross section than the oval connecting portion, and a press fitted around the outer periphery of the tubular portion of the connected member In the rotary shaft coupling mechanism that compresses the cylindrical part and presses and fixes the oval inner hole to the oval coupling part of the rotary shaft by shrinking the inner peripheral diameter of the device as a whole,
The gap between the whole or a part of the outer peripheral surface located on the outer peripheral side of the flat portion of the oval inner hole in the cylindrical portion of the connected member and the inner peripheral surface of the pressing device is the circumference of the oval inner hole. Forming larger than the gap between the outer peripheral surface located on the outer peripheral side of the part and the inner peripheral surface of the pressing device,
Further, the inner peripheral surface of the pressing device is a perfect circular circumferential surface, and the outer peripheral surface of the tubular portion of the connected member is a perfect circular circumference slightly smaller in diameter than the inner peripheral surface of the pressing device. A part or all of the outer peripheral surface located along the surface and on the outer peripheral side of the flat portion of the oval inner hole is formed into a flat surface or a curved surface drawn inward from the circumferential surface. To do.
[0010]
According to the invention of claim 1, when the pressing device contracts the inner peripheral diameter, the outer peripheral surface located on the outer peripheral side of the peripheral portion of the oval inner hole in the cylindrical portion is sufficiently compressed because the gap is small. However, the outer peripheral surface located on the outer peripheral side of the flat portion of the oval inner hole is not sufficiently compressed because there is a portion having a large gap. Therefore, this cylindrical part is less compressed on the thicker flat part side, and the thinner circumferential part is stronger, so the higher rigid flat part has a lower rigidity due to the parallel movement caused by the compression. This eliminates the possibility of causing the portion to bulge outward and deforms it, so that the oval connecting portion of the rotating shaft can be reliably pressed over the entire circumference. Moreover, since the inner peripheral surface of the pressing device is a perfect circle , the manufacturing of the pressing device is facilitated. Further , the outer peripheral surface of the cylindrical portion of the connected member can be easily formed into a flat surface or a curved surface drawn inward from the original circumferential surface by cutting a necessary portion after being processed into a perfect circle.
[0011]
In the invention of claim 2, the flat surface or curved surface drawn inwardly on the outer peripheral surface of the cylindrical portion of the connected member is formed only on the outer peripheral surface located on the outer peripheral side of both ends of the flat portion of the oval inner hole. It is characterized by that.
[0012]
According to the invention of claim 2 , when the pressing device contracts the inner peripheral diameter, the outer peripheral surface located on the outer peripheral side of the circumferential portion of the oval inner hole in the cylindrical portion and the outer peripheral side of the central portion of the flat portion. The outer peripheral surface is sufficiently compressed because the gap is small, but the outer peripheral surface located on the outer peripheral side of both ends of the flat portion of the oval inner hole has a large gap due to the plane or curved surface drawn inward There is not enough pressure to be. Therefore, since only the circumferential portion and the central portion of the flat portion are strongly and uniformly pressed in this cylindrical portion, the oval connecting portion of the rotating shaft can be reliably pressed from four directions. In addition, both sides of the thick flat surface side are insufficiently compressed, and the compression is weak as a whole, and the thin circumferential portion is fully compressed, so a highly rigid flat surface portion There is no risk of deforming the circumferential portion having low rigidity due to the parallel movement caused by the compression.
[0013]
According to a third aspect of the present invention, the flat surface or curved surface drawn inwardly on the outer peripheral surface of the cylindrical portion of the connected member is formed only on the outer peripheral surface located on the outer peripheral side of the central portion of the flat portion of the oval inner hole. It is characterized by that.
[0014]
According to the invention of claim 3 , when the pressing device contracts the inner peripheral diameter, the outer peripheral surface located on the outer peripheral side of the circumferential portion of the oval inner hole in the cylindrical portion and the outer peripheral side of both end portions of the flat portion. The outer peripheral surface is sufficiently compressed because the gap is small, but the outer peripheral surface located on the outer peripheral side of the central part of the flat part of the oval inner hole has a large gap due to the plane or curved surface drawn inward There is not enough pressure to be. Therefore, since this cylindrical part is strongly and uniformly compressed at both ends of the circumferential part and the flat part, the oval connecting part of the rotating shaft can be reliably pressed from the circumference of the circumferential part. Become. In addition, the thicker flat surface side is insufficiently compressed in the center, and the overall compression is weak, and the thin circumferential portion is fully compressed, so a highly rigid flat surface portion There is no risk of deforming the circumferential portion having low rigidity due to the parallel movement caused by the compression.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
Figures 1-2, there is shown a first embodiment of the present invention, FIG. 1 is a cross sectional view showing the configuration of a rotary shaft coupling mechanism of the rolling machine, Figure 2 shows the configuration of a roll coupling It is a perspective view. In addition, the same number is attached | subjected to the structural member which has the same function as the prior art example shown in FIGS.
[0017]
This embodiment, as shown in FIG. 1, illustrating a rolling roll 1 of the conventional example similar to the mill for rotating shaft coupling mechanism for connecting to the roll coupling 2. At the shaft end portion of the rolling roll 1, an oval connecting portion 1a having an oval cross section is formed as in the conventional example. The cross-sectional oblong shape refers to a shape in which both sides of the circumferential outer peripheral surface of the shaft body are scraped by planes that are substantially parallel to each other along the axis, and each portion of the outer peripheral surface that is scraped by the plane is a flat portion. And the remaining part becomes the circumferential part. Usually, these flat portions are equidistant from the axis and have a symmetrical shape. However, in the case of a hole having an oblong cross section, the hole shape is such that the outer peripheral surface of the shaft body is fitted without a gap.
[0018]
The roll coupling 2 is a cylindrical portion for connecting the rolling roll 1 formed at one end of the universal joint. As shown in FIG. A hole 2a is formed. The oval inner hole 2a is a hole formed in a cross sectional oval shape slightly larger than the oval connecting portion 1a of the rolling roll 1, that is, a substantially uniform small gap between the outer periphery of the oval connecting portion 1a. Is a hole having a cross-sectional oblong shape, and includes a circumferential portion and a planar surface portion 2b. On the outer peripheral surface of the roll coupling 2, a circular surface that is concentric with the circumferential portion of the oval inner hole 2a is formed, and at both ends of each flat portion 2b of the oval inner hole 2a. A notch surface 2c is formed on each of the positioned outer peripheral surfaces. The notch surface 2c is a flat surface having a shape obtained by scraping a part of the outer peripheral surface of the roll coupling 2 along a plane along the axis, and is a surface drawn inward from the original circumferential surface. In the present embodiment, the notch surface 2c is formed over almost the entire length of the outer peripheral surface of the roll coupling 2, but it may be formed only in the central portion excluding the base portion and the edge portion in the axial direction.
[0019]
As shown in FIG. 1, a sleeve 3 with a hydraulic expansion chamber is fitted on the outer periphery of the roll coupling 2. The sleeve 3 with the hydraulic expansion chamber is a cylindrical body having a circular circumferential surface slightly larger than the outer peripheral surface of the roll coupling 2 on the inner periphery, as in the conventional example, and extremely close to the inner peripheral surface. The hydraulic expansion chamber 3a formed of a thin cylindrical space over the entire circumference is formed in the part. The hydraulic expansion chamber 3a is connected to a hydraulic port 3b that opens to the outer peripheral surface. By applying high pressure hydraulic pressure from the hydraulic port 3b, the hydraulic expansion chamber 3a is expanded and the diameter of the inner peripheral surface is increased. Can be shrunk. When the sleeve 3 with the hydraulic expansion chamber is externally fitted in this way, a slight gap is generated between the roll coupling 2 and the outer peripheral surface. Then, this gap becomes larger.
[0020]
In the rotary shaft coupling mechanism having the above configuration, first, the oval coupling portion 1 a at the shaft end of the rolling roll 1 is inserted into the oval inner hole 2 a of the roll coupling 2. In this case, the oval inner hole 2a is formed slightly larger than the oval connecting portion 1a, so that it can be easily inserted. Next, high-pressure oil pressure is applied to the hydraulic port 3b of the sleeve 3 with the hydraulic expansion chamber to contract the inner peripheral diameter. Then, the inner peripheral surface of the sleeve 3 with the hydraulic expansion chamber presses the outer surface of the roll coupling 2 inward to contract the oval inner hole 2a. However, at this time, the outer peripheral surface of the roll coupling 2 is compressed with the notch surface 2c formed on the outer peripheral side of the circumferential portion of the oval inner hole 2a and the outer peripheral side of the central portion of the flat surface portion 2b. It becomes stronger than the outer peripheral side of both ends of the flat surface portion 2b of the oval inner hole 2a in which the gap is increased. For this reason, the roll coupling 2 shrinks the oval inner hole 2a evenly from the four sides and reliably presses the outer surface of the oval connecting portion 1a of the rolling roll 1. Moreover, the outer peripheral side of the flat portion 2b of the oval inner hole 2a in the roll coupling 2 is weakly compressed at the portion where the notch surface 2c is formed. The pressure is stronger. Accordingly, since the flat portion 2b side having a large thickness and high rigidity is strongly compressed and moved in parallel, there is no possibility that the circumferential portion side having a small thickness and low rigidity bulges outward and is deformed. As a result, the oval connection 1a of the rolling roll 1 can be reliably fixed.
[0021]
As described above, according to the present embodiment , the oval inner hole 2a of the roll coupling 2 reliably presses and fixes the outer peripheral surface of the oval connecting portion 1a of the rolling roll 1 from four directions, so that the rolling work Even when a strong force in the radial direction is applied to the rolling roll 1 sometimes, it is possible to prevent rattling from occurring with the roll coupling 2.
[0022]
Figure 3 is a view illustrating the second embodiment of the present invention, is a cross-sectional side view showing the configuration of a rolling mill of rotating shaft coupling mechanism. In addition, the same number is attached | subjected to the structural member which has a function similar to 1st Embodiment shown in FIGS. 1-2.
[0023]
This embodiment, like the first embodiment, will be described rotary shaft coupling mechanism for coupling the rolling roll 1 of the rolling mill to roll the coupling 2. The structure of the rolling roll 1 and the sleeve 3 with a hydraulic expansion chamber is the same as that of the first embodiment. Further, the roll coupling 2 also is substantially similar to the first embodiment, as shown in FIG. 3, the inner circumference, are formed oval shape hole 2a. However, on the outer peripheral surface of the roll coupling 2, a circular surface that is concentric with the circumferential portion of the oval inner hole 2a is formed, and the center of each flat surface portion 2b of the oval inner hole 2a is formed. A notch surface 2c is formed on each outer peripheral surface located on the outer peripheral side of the portion. In the present embodiment, the notch surface 2c is formed over substantially the entire length of the outer peripheral surface of the roll coupling 2, but it may be formed only in the central portion excluding the base portion and the edge portion in the axial direction.
[0024]
Above the outer periphery of the roll coupling 2, the first same hydraulic expansion chamber with the sleeve 3 from the embodiment of is fitted. When the sleeve 3 with the hydraulic expansion chamber is externally fitted in this way, a slight gap is generated between the roll coupling 2 and the outer peripheral surface. Then, this gap becomes larger.
[0025]
Rotary shaft coupling mechanism of the above configuration, similarly to the first embodiment, by inserting the oval coupling portion 1a of the shaft end portion of the rolling roller 1 into oval shape hole 2a of the roll coupling 2, hydraulic expansion chamber A high-pressure oil pressure is applied to the hydraulic port 3b of the attached sleeve 3 to shrink the inner peripheral diameter. Then, the inner peripheral surface of the sleeve 3 with the hydraulic expansion chamber presses the outer surface of the roll coupling 2 inward to contract the oval inner hole 2a. However, at this time, the outer peripheral surface of the roll coupling 2 is compressed by the notch surface 2c formed on the outer peripheral side of the circumferential portion of the oval inner hole 2a and the outer peripheral side of both end portions of the flat surface portion 2b. It becomes stronger than the outer peripheral side of the central portion of the flat surface portion 2b of the oval inner hole 2a in which the gap is increased. For this reason, the roll coupling 2 is uniformly contracted so as to hold the oval inner hole 2a from the periphery of the circumferential portion, and is securely pressed against the outer peripheral surface of the oval connecting portion 1a of the rolling roll 1. Moreover, the outer peripheral side of the flat portion 2b of the oval inner hole 2a in the roll coupling 2 is weakly compressed at the portion where the notch surface 2c is formed. The pressure is stronger. Therefore, as in the case of the first embodiment, there is no possibility that the circumferential side swells outward and deforms, so that the pressure contact on the circumferential side is sufficiently performed, and the rolling roll 1 The oval connecting portion 1a can be reliably fixed.
[0026]
As described above, according to the present embodiment , the oval inner hole 2a of the roll coupling 2 reliably presses the outer peripheral surface of the oval connecting portion 1a of the rolling roll 1 from the periphery of the circumferential portions on both sides. Since it fixes, even when a strong radial force is applied to the rolling roll 1 during the rolling operation, it is possible to prevent rattling from occurring with the roll coupling 2.
[0027]
In the first and second embodiments , the case where the notch surface 2c along the axial direction is formed on the outer peripheral surface of the roll coupling 2 has been described. However, the notch surface 2c As long as it is an outer peripheral surface on the outer peripheral side of the flat portion 2b of the oval inner hole 2a in the ring 2, it may be formed in its entirety or any part. Moreover, this notch surface 2c does not need to be a plane, For example, it can also be comprised by the curved surface whose curvature is smaller than the circumferential surface of an outer peripheral surface.
[0028]
Further, the first and the second embodiment, when the inner peripheral surface and the circumferential surface other than the cut-away surface 2c of the outer peripheral surface of the roll coupling 2 of the hydraulic expansion chamber with the sleeve 3 is true circle description However, these do not necessarily have to be a perfect circle, and for example, both may have an elliptical circumferential surface. However, the sleeve 3 with a hydraulic expansion chamber is manufactured by inserting a very thin cylinder with a small diameter into the inner periphery of the cylindrical body so that the gaps are equal, and sealing the openings at both ends by welding. It is what is done. Accordingly, if the inner peripheral surface of the sleeve 3 with the hydraulic expansion chamber is to be formed in an elliptical shape, a very thin cylindrical body having an elliptical shape must be inserted and welded to the inner peripheral surface of the elliptical shape with high accuracy. Processing becomes extremely difficult. On the other hand, if the inner peripheral surface of the sleeve 3 with the hydraulic expansion chamber is a perfect circular circumferential surface, not only the manufacture of the sleeve 3 with the hydraulic expansion chamber is facilitated but also the outer peripheral surface of the roll coupling 2 is improved. The notch surface 2c can also be easily formed by cutting or grinding after forming a perfectly circular circumferential surface.
[0029]
Furthermore, the first and the second embodiments have been described circumferential surface of the outer peripheral surface of the roll coupling 2 is true circle, which is not necessarily a perfect circle, for example, oval It may have a circumferential surface. In this case, the oval circumferential surface of the oval inner hole 2a of the roll coupling 2 has a major axis on the circumferential side of the oval inner hole 2a. Since it can be used as a shaft, a larger gap can be formed on the flat portion 2b side with the perfect inner circumference surface of the sleeve 3 with the hydraulic expansion chamber, which is the same as the case where the notch surface 2c is formed. An effect can be obtained.
[0030]
Furthermore, the first and the second embodiment uses a hydraulic expansion chamber with the sleeve 3 in order to compress the roll coupling 2, intended to substantially uniformly compress the outer peripheral surface of the roll coupling 2 Any pressing device may be used as long as it exists. For example, the inner peripheral diameter may be contracted by a mechanical structure such as the sleeve 3 with a hydraulic expansion chamber, or the inner peripheral diameter may be contracted by a physical structure or thermal expansion / contraction.
[0031]
Furthermore, the first and the second embodiment has been described rotary shaft coupling mechanism for coupling the rolling roll 1 of the rolling mill to roll the coupling 2, also the rotation shaft coupling mechanism for connecting the other rotating shaft Can be implemented as well.
[0032]
【The invention's effect】
As is clear from the above description, according to the rotating shaft coupling mechanism of the present invention, a portion where the gap with the inner circumferential surface of the pressing device becomes large is formed in a part of the outer circumferential surface of the cylindrical portion of the coupled member. Thus, the balance of the compression force of the pressing device can be adjusted, and the oval inner hole of the cylindrical portion can be securely pressed and fixed to the oval connecting portion of the rotating shaft.
[Brief description of the drawings]
[1] there is shown a first embodiment of the present invention, it is a cross-sectional view showing the configuration of a rolling mill of rotating shaft coupling mechanism.
[2] there is shown a first embodiment of the present invention, it is a perspective view showing the configuration of a roll coupling.
[3] there is shown a second embodiment of the present invention, it is a cross-sectional view showing the configuration of a rolling mill of rotating shaft coupling mechanism.
FIG. 4 is a longitudinal sectional perspective view showing a conventional example and showing a configuration of a rotating shaft coupling mechanism of a rolling mill.
FIG. 5 is a sectional view in the axial direction showing a configuration of a rotary shaft coupling mechanism of a rolling mill, showing a conventional example.
FIG. 6 is a cross-sectional view showing a conventional example and showing a configuration of a rotating shaft coupling mechanism of a rolling mill.
FIG. 7 is a cross-sectional view showing a conventional example and showing how a roll coupling is deformed.
FIG. 8 shows another conventional example and is a cross-sectional view showing a configuration of a rotating shaft coupling mechanism of a rolling mill.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roll 1a Oval connection part 1b Plane part 2 Roll coupling 2a Oval inner hole 2b Plane part 2c Notch surface 3 Sleeve with hydraulic expansion chamber

Claims (3)

The oval connecting part at the shaft end of the rotating shaft formed in a cross-sectional oval shape with both sides of the circumferential outer surface cut off by planes substantially parallel to each other along the axis is from this oval connecting part. The inner diameter of the pressing device that is externally fitted to the outer periphery of the cylindrical portion of the connected member is inserted into the oval inner hole of the cylindrical portion of the connected member that has a slightly larger cross sectional shape. In the rotary shaft coupling mechanism that compresses the cylindrical portion and presses and fixes the oval inner hole to the oval coupling portion of the rotary shaft,
The gap between the whole or a part of the outer peripheral surface located on the outer peripheral side of the flat portion of the oval inner hole in the cylindrical portion of the connected member and the inner peripheral surface of the pressing device is the circumference of the oval inner hole. Forming larger than the gap between the outer peripheral surface located on the outer peripheral side of the part and the inner peripheral surface of the pressing device,
Further, the inner peripheral surface of the pressing device is a perfect circular circumferential surface, and the outer peripheral surface of the tubular portion of the connected member is a perfect circular circumference slightly smaller in diameter than the inner peripheral surface of the pressing device. A part or all of the outer peripheral surface located along the surface and on the outer peripheral side of the flat portion of the oval inner hole is formed into a flat surface or a curved surface drawn inward from the circumferential surface. rotary shaft coupling mechanism. The plane or curved surface drawn inwardly on the outer peripheral surface of the cylindrical portion of the connected member is formed only on the outer peripheral surface located on the outer peripheral side of both ends of the flat portion of the oval inner hole. Item 2. The rotating shaft coupling mechanism according to Item 1 . The flat surface or curved surface drawn inwardly on the outer peripheral surface of the cylindrical portion of the connected member is formed only on the outer peripheral surface located on the outer peripheral side of the central portion of the flat portion of the oval inner hole. Item 2. The rotating shaft coupling mechanism according to Item 1 .

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